Document:

exv10w12

Exhibit 10.12

EXECUTION

AMENDED AND RESTATED PLEDGE AND SECURITY AGREEMENT

(POSTROCK KPC PIPELINE, LLC)

     THIS AMENDED AND RESTATED PLEDGE AND SECURITY AGREEMENT (herein referred to as this “Security
Agreement”) is executed as of September 21, 2010, by POSTROCK KPC PIPELINE, LLC, a Delaware limited
liability company, formerly known as and successor by conversion to Quest Pipelines (KPC), a Kansas
general partnership, and successor by merger to Quest Kansas Pipeline, L.L.C. and Quest Kansas
General Partner L.L.C. (“Debtor”), whose address is 210 Park Avenue, Suite 2750, Oklahoma City,
Oklahoma 73102, in favor of ROYAL BANK OF CANADA as Collateral Agent (hereafter defined) for the
benefit of the Beneficiaries (hereafter defined) (the Collateral Agent, in such capacity, the
“Secured Party”) whose address is Royal Bank Plaza, P.O. Box 50, 200 Bay Street, 12th Floor, South
Tower, Toronto, Ontario M5J 2W7.

RECITALS

     A. Quest Midstream Partners, L.P., a Delaware master limited partnership (which merged into
and became Quest Acquisition Partners, LLC, which changed its name to PostRock Midstream, LLC,
which merged into PostRock Energy Services Corporation) and Bluestem Pipeline, LLC, as borrowers,
and Royal Bank of Canada as administrative and collateral agent, and the lenders party thereto,
entered into a Credit Agreement, dated as of January 31, 2007, providing for a $75,000,000 Senior
Credit Facility (as amended from time to time, the “Original Midstream Credit Agreement”).

     B. The Original Midstream Credit Agreement was amended and restated by an Amended and Restated
Credit Agreement dated as of November 1, 2007 among Quest Midstream Partners, L.P. and Bluestem
Pipeline, LLC, as borrowers, Royal Bank of Canada, as administrative and collateral agent, and the
lenders party thereto (the “Midstream Lenders”) providing for a $135,000,000 Senior Credit Facility
(as amended from time to time, the “First Amended and Restated Midstream Credit Agreement”).

     C. In connection with the First Amended and Restated Midstream Credit Agreement, Quest
Midstream Partners, L.P. financed its acquisition of (i) 100% of the limited liability company
membership interest in each of (a) Midcoast Kansas Pipeline, L.L.C., a Delaware limited liability
company (whose name after its acquisition was changed to Quest Kansas Pipeline, L.L.C.), and (b)
Midcoast Kansas General Partner, L.L.C., a Delaware limited liability company (whose name after its
acquisition was changed to Quest Kansas General Partner, L.L.C.), each of whom collectively owned
100% of the general partner interest in Debtor’s predecessor, Enbridge Pipelines (KPC), a Kansas
general partnership (whose name after its acquisition was changed to Quest Pipelines (KPC)) which
owned an approximate 1,120 mile interstate natural gas pipeline, gathering systems, processing
facilities and related assets located in the States of Kansas, Oklahoma and Missouri (the “KPC
Pipeline”).

     D. In order to secure repayment of the loans and the payment and performance of all other
obligations set forth in the First Amended and Restated Midstream Credit Agreement, Debtor (or its
predecessor-in-interest) executed and delivered that certain (i) Guaranty dated as of November 1,
2008 and (ii) Pledge and Security Agreements dated as of November 1, 2008 in favor of Royal Bank of
Canada, as administrative agent and collateral agent for various lenders under the First
Amended and

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Restated Midstream Credit Agreement (such Pledge and Security Agreements, as amended
heretofore, collectively, the “Existing Security Agreement”).

     E. The First Amended and Restated Midstream Credit Agreement was amended by a First Amendment
to Amended and Restated Credit Agreement, dated November 1, 2007, Second Amendment to Amended and
Restated Credit Agreement, dated October 28, 2008, and Third Amendment to Amended and Restated
Credit Agreement, dated December 17, 2009 (the First Amended and Restated Midstream Credit
Agreement as so amended the “Prior Midstream Credit Agreement”).

     F. The Prior Midstream Credit Agreement is being amended and restated in its entirety pursuant
to that certain Second Amended and Restated Credit Agreement of even date herewith (the “Pipeline
Credit Agreement”), among PESC and Debtor (collectively PESC and Debtor, the “Pipeline Facility
Borrowers”), each lender from time to time party thereto (collectively, the “Pipeline Facility
Lenders”), and Royal Bank of Canada, as administrative agent and collateral agent, pursuant to
which the Pipeline Facility Lenders have agreed to make a $15,000,000 term loan to the Pipeline
Facility Borrowers.

     G. Pursuant to that certain Second Amended and Restated Credit Agreement dated of even date
herewith (the “Borrowing Base Facility Credit Agreement”; the Pipeline Credit Agreement, together
with the Borrowing Base Facility Credit Agreement collectively, the “Credit Agreements” and
individually a “Credit Agreement”), among PESC and MidContinent (collectively, the “Borrowing Base
Facility Borrowers”), each lender from time to time party thereto (collectively, the “Borrowing
Base Facility Lenders”), and Royal Bank of Canada, as administrative agent and collateral agent,
the Borrowing Base Facility Lenders have agreed to make loans and issue letters of credit to or for
the Borrowing Base Facility Borrowers in the initial amount of $225,000,000.

     H. Pursuant to an Intercreditor and Collateral Agency Agreement dated of even date herewith
(the “Intercreditor Agreement”) among Royal Bank of Canada, as First Lien Agent (hereafter defined)
for the First Lien Secured Parties (hereafter defined), the First Lien Secured Parties, Royal Bank
of Canada, as Second Lien Agent (hereafter defined) for the Second Lien Secured Parties (hereafter
defined), the Second Lien Secured Parties, Royal Bank of Canada, as collateral agent for the First
Lien Secured Parties and Second Lien Secured Parties, Debtor and each of PESC and MidContinent, the
Collateral Agent agreed to act as collateral agent for the First Lien Secured Parties and Second
Lien Secured Parties for purposes of dealing with the Collateral, including for purposes of this
Security Agreement, apportioning payments among First Lien Secured Parties and the Second Lien
Secured Parties with respect to proceeds thereof.

     I. The Debtor has agreed to amend and restate the Existing Security Agreement, and (i) in
connection with the Pipeline Credit Agreement, Debtor desires to secure all indebtedness owing
under the Pipeline Credit Agreement with a first priority lien on the Collateral, and (ii) in
connection with the Borrowing Base Facility Credit Agreement, Debtor desires to secure all
indebtedness owing under the Borrowing Base Facility Credit Agreement with a lien on the Collateral
which is junior, subject and subordinated to the lien on the Collateral securing indebtedness owing
under the Pipeline Credit Agreement.

     J. Debtor has duly authorized the execution, delivery and performance of this Security
Agreement.

 
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     K. This Security Agreement is integral to the transactions contemplated by the Intercreditor
Agreement and Credit Agreements, and the execution and delivery of this Security Agreement is
required under the terms of the Credit Agreements.

     ACCORDINGLY, for valuable consideration, the receipt and adequacy of which are hereby
acknowledged, Debtor and Secured Party agree to and do hereby amend and restate the Existing
Security Agreement in its entirety as follows:

     1. REFERENCE TO PIPELINE CREDIT AGREEMENT. The terms, conditions, and provisions of the
Pipeline Credit Agreement are incorporated herein by reference, the same as if set forth
herein verbatim, which terms, conditions, and provisions shall continue to be in full force and
effect hereunder so long as the Pipeline Facility Lenders are obligated to lend under the
Pipeline Credit Agreement and thereafter until the Obligations (hereafter defined) are
paid and performed in full (except as provided in Sections 10.01(d) and 10.01(e) of the
Pipeline Credit Agreement).

     2. CERTAIN DEFINITIONS. Unless otherwise defined herein, or the context hereof otherwise
requires, each term defined in the Pipeline Credit Agreement or in the UCC is used in
this Security Agreement with the same meaning; provided that, if the definition given to such term
in the Pipeline Credit Agreement conflicts with the definition given to such term in the
UCC, the definition in the Pipeline Credit Agreement shall control to the extent legally
allowable; and if any definition given to such term in Chapter 9 of the UCC conflicts with the
definition given to such term in any other chapter of the UCC, the Chapter 9 definition shall
prevail. As used herein, the following terms have the meanings indicated:

     Beneficiaries means collectively all of the Intercreditor Secured Parties and
Beneficiary means any one of the Beneficiaries.

     Borrowing Base Facility Borrowers has the meaning set forth in Recital G hereto.

     Borrowing Base Facility Credit Agreement has the meaning set forth in Recital G hereto.

     Borrowing Base Facility Lenders has the meaning set forth in Recital G hereto.

     Collateral has the meaning set forth in Paragraph 4 hereof.

     Collateral Agent means Royal Bank of Canada in its capacity as “Collateral Agent” for
the Intercreditor Secured Parties pursuant to the Intercreditor Agreement.

     Collateral Note Security has the meaning set forth in Paragraph 4 hereof.

     Collateral Notes has the meaning set forth in Paragraph 4 hereof.

     Control Agreement means, with respect to any Collateral consisting of investment
property, Deposit Accounts, electronic chattel paper, and letter-of-credit rights, an
agreement evidencing that Secured Party has “control” (as defined in the UCC) of such
Collateral.

 
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     Copyrights has the meaning set forth in Paragraph 4 hereof.

     Credit Agreements and Credit Agreement have the meanings set forth in Recital G hereto.

     Debtor has the meaning set forth in the introductory paragraph hereto.

     Deposit Accounts has the meaning set forth in Paragraph 4 hereof.

     Existing Security Agreement has the meaning set forth in Recital D hereto.

     First Amended and Restated Midstream Credit Agreement has the meaning set forth in
Recital B hereto.

     First Lien Agent has the meaning set forth in the Intercreditor Agreement.

     First Lien Document has the meaning set forth in the Intercreditor Agreement.

     First Lien Notes has the meaning set forth in the definition of “Obligations”.

     First Lien Obligations has the meaning set forth in the Intercreditor Agreement.

     First Lien Secured Parties has the meaning set forth in the Intercreditor Agreement.

     Intellectual Property has the meaning set forth in Paragraph 4 hereof.

     Intercreditor Agreement has the meaning set forth in Recital H hereto.

     Intercreditor Secured Parties means the “Secured Parties” as defined in the
Intercreditor Agreement.

     KPC Pipeline has the meaning set forth in Recital C hereto.

     MidContinent means PostRock MidContinent Production, LLC, a Delaware limited liability
company.

     Midstream Lenders has the meaning set forth in Recital B hereto.

     Notes has the meaning set forth in the definition of “Obligations”.

     Obligations means, collectively

     (a) all indebtedness, liabilities, and obligations of Debtor arising under this
Security Agreement; it being the intention and contemplation of Debtor and Secured Party
that future advances will be made by Secured Party or one or more Beneficiaries to the
Debtor for a variety of purposes,

 
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     (b) all First Lien Obligations including without limitation, all indebtedness,
obligations and liabilities, whether now in existence or hereafter arising, whether by
acceleration or otherwise, of PESC and/or Debtor arising out of or under the Pipeline Credit
Agreement and each other First Lien Document to which Debtor is a party, and all
indebtedness, obligations and liabilities, whether now in existence or hereafter arising,
whether by acceleration or otherwise, and evidenced by those certain promissory notes in the
aggregate principal amount of Fifteen Million and 00/100 United States Dollars (US
$15,000,000.00) executed jointly and severally by PESC and Debtor and payable to the order
of the Pipeline Facility Lenders on or before February 28, 2012 and all other notes given in
substitution for the foregoing promissory notes, or in modification, renewal, rearrangement
or extension thereof, in whole or in part (such promissory notes, as from time to time
supplemented, amended or modified and all other notes given in substitution therefor or in
modification, renewal, rearrangement or extension thereof, in whole or in part, being
hereafter collectively called the “First Lien Notes”), and with interest, collection and
attorneys’ fees, all as provided therein,

     (c) all Second Lien Obligations including without limitation, (i) all indebtedness,
obligations and liabilities, whether now in existence or hereafter arising, whether by
acceleration or otherwise, of Midcontinent and PESC arising out of or under the Borrowing
Base Facility Credit Agreement and each other Second Lien Document, and all indebtedness,
obligations and liabilities, whether now in existence or hereafter arising, whether by
acceleration or otherwise, and evidenced by those certain promissory notes executed jointly
and severally by Midcontinent and PESC and payable to the order of the Borrowing Base
Facility Lenders on or before June 30, 2013 and all other notes given in substitution for
the foregoing promissory notes, or in modification, renewal, rearrangement or extension
thereof, in whole or in part (such promissory notes, as from time to time supplemented,
amended or modified and all other notes given in substitution therefor or in modification,
renewal, rearrangement or extension thereof, in whole or in part, being hereafter
collectively called the “Second Lien Notes;” the First Lien Notes and the Second
Lien Notes collectively called the “Notes”), and with interest, collection and attorneys’
fees, all as provided therein and (ii) all indebtedness, obligations and liabilities,
whether now in existence or hereafter arising, whether by acceleration or otherwise, in
respect to letters of credit issued pursuant to the Borrowing Base Facility Credit Agreement
and all reimbursement obligations in respect thereof. It being understood and agreed that
the liens and security interests granted in this Security Agreement to secure the
indebtedness described in (c) above are junior, subject and subordinated to the liens and
security interests granted in this Security Agreement to secure the indebtedness described
in (a) and (b) above and this Security Agreement is a Security Document (as defined in the
Intercreditor Agreement) and is subject to the agreements set forth in the Intercreditor
Agreement,

     (d) all additional loans or advances made by the Beneficiaries to or for the benefit of
the Debtor and PESC pursuant to the Pipeline Credit Agreement, or of PESC or MidContinent
pursuant to the Borrowing Base Facility Credit Agreement or any other First Lien Document or
Second Lien Document,

     (e) payment of and performance of any and all present or future obligations of the
Debtor according to the terms of any Lender Hedging Agreement,

     (f) any sums which may be advanced or paid by Secured Party or any Beneficiary under
the terms hereof or of the Pipeline Credit Agreement or any other First Lien Document on

 
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account of the failure of Debtor to comply with the covenants of Debtor contained
herein, or the failure of Debtor to comply with the covenants of Debtor contained in the
Pipeline Credit Agreement or any other First Lien Document; and all other indebtedness of
Debtor arising pursuant to the provisions of this Security Agreement, including penalties,
indemnities, legal and other fees, charges and expenses, and amounts advanced by and
expenses incurred in order to preserve any collateral or security interest, whether due
after acceleration or otherwise; and

     (g) all interest (including, without limitation, interest accruing at any post-default
rate and interest accruing after the filing of any petition in bankruptcy, or the
commencement of any insolvency, reorganization or like proceeding, whether or not a claim
for post-filing or post-petition interest is allowed in such proceeding) in respect of all
of the indebtedness described herein and all costs of collection and attorneys’ fees, all as
provided herein and in the Pipeline Credit Agreement and Borrowing Base Facility Credit
Agreement.

     Obligor means any Person obligated with respect to any of the Collateral, whether as an
account debtor, obligor on an instrument, issuer of securities, or otherwise.

     Original Midstream Credit Agreement has the meaning set forth in Recital A hereto.

     Partnerships/Limited Liability Companies shall mean: (a) those partnerships and limited
liability companies listed on Annex B-1 attached hereto and incorporated herein by
reference, as such partnerships or limited liability companies exist or may hereinafter be
restructured; (b) any partnership, joint venture, or limited liability company in which
Debtor shall, at any time, become a limited or general partner, venturer, or member; or (c)
any partnership, joint venture, or corporation formed as a result of the restructure,
reorganization, or amendment of the Partnerships/Limited Liability Companies.

     Partnership/Limited Liability Company Agreements shall mean: (a) those agreements
listed on Annex B-1 attached hereto and incorporated herein by reference (together with any
modifications, amendments, or restatements thereof); and (b) partnership agreements, joint
venture agreements, or organizational agreements for any of the partnerships, joint
ventures, or limited liability companies described in clause (b) of the definition of
“Partnerships/Limited Liability Companies” above (together with any modifications,
amendments or restatements thereof), and “Partnership/Limited Liability Company Agreement”
means any one of the Partnership/Limited Liability Company Agreements.

     Partnership/Limited Liability Company Interests shall mean all of Debtor’s Rights,
title and interest now or hereafter accruing under the Partnership/Limited Liability Company
Agreements with respect to all distributions, allocations, proceeds, fees, preferences,
payments, or other benefits, which Debtor now is or may hereafter become entitled to receive
with respect to such interests in the Partnerships/Limited Liability Companies and with
respect to the repayment of all loans now or hereafter made by Debtor to the
Partnerships/Limited Liability Companies.

     Patents has the meaning set forth in Paragraph 4 hereof.

     PESC means PostRock Energy Services Corporation, a Delaware corporation.

     Pipeline Credit Agreement has the meaning set forth in Recital F hereto.

 
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     Pipeline Facility Borrowers and Pipeline Facility Borrower have the meanings set forth
in Recital F hereto.

     Pipeline Facility Lenders and Pipeline Facility Lender have the meanings set forth in
Recital F hereto.

     Pledged Securities means, collectively, the Pledged Shares and any other Collateral
constituting securities.

     Pledged Shares has the meaning set forth in Paragraph 4 hereof.

     Prior Midstream Credit Agreement has the meaning set forth in Recital E hereto.

     Rights means rights, remedies, powers, privileges and benefits.

     Second Lien Agent has the meaning set forth in the Intercreditor Agreement.

     Second Lien Document has the meaning set forth in the Intercreditor Agreement.

     Second Lien Notes has the meaning set forth in the definition of “Obligations”.

     Second Lien Obligations has the meaning set forth in the Intercreditor Agreement.

     Second Lien Secured Parties has the meaning set forth in the Intercreditor
Agreement.

     Secured Party has the meaning set forth in the introductory paragraph hereto.

     Security Agreement has the meaning set forth in the introductory paragraph hereto.

     Security Interest means the security interest granted and the pledge and assignment
made under Paragraph 3 hereof.

     Trademarks has the meaning set forth in Paragraph 4 hereof.

     UCC means the Uniform Commercial Code, including each such provision as it may
subsequently be renumbered, as enacted in the State of New York or other applicable
jurisdiction, as amended at the time in question.

     3. SECURITY INTEREST. In order to secure the full and complete payment and performance of the
Obligations when due, Debtor hereby grants to Secured Party a Security Interest in all of Debtor’s
Rights, titles, and interests in and to the Collateral of Debtor and pledges, collaterally
transfers, and assigns the Collateral to Secured Party, all upon and subject to the terms and
conditions of this Security Agreement. Obligations referred to herein includes all renewals,
extensions and modifications thereof, and all substitutions thereof, in whole or in part. Such
Security Interest is granted and pledge and assignment are made as security only and shall not
subject Secured Party to, or transfer or in any way affect or modify, any obligation of Debtor with
respect to any of the Collateral or any transaction involving or giving rise thereto.

 
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     4. COLLATERAL. As used herein, the term “Collateral” means the following items and types of
property, wherever located, now owned or in the future existing or acquired by Debtor, and all
proceeds and products thereof, and any substitutes or replacements therefor:

     (a) all personal property and fixture property of every kind and nature including,
without limitation, all accounts, chattel paper (whether tangible or electronic), goods
(including inventory, equipment, and any accessions thereto), software, instruments,
investment property, documents, deposit accounts, money, commercial tort claims, letters of
credit and letter-of-credit rights, supporting obligations, tax refunds, and general
intangibles (including payment intangibles);

     (b) all Rights, titles, and interests of Debtor in and to all outstanding stock,
equity, or other investment securities owned by Debtor, including, without limitation, all
capital stock of each Subsidiary of the Debtor set forth on Annex B-1 (“Pledged Shares”);

     (c) all Rights, titles, and interests of Debtor in and to all promissory notes and
other instruments payable to Debtor, including, without limitation, all inter-company notes
from Subsidiaries, to the extent not merely evidenced by book entries, and those set forth
on Annex B-1 (“Collateral Notes”) and all Rights, titles, interests, and Liens Debtor may
have, be, or become entitled to under all present and future loan agreements, security
agreements, pledge agreements, deeds of trust, mortgages, guarantees, or other documents
assuring or securing payment of or otherwise evidencing the Collateral Notes, including,
without limitation, those set forth on Annex B-1 (“Collateral Note Security”);

     (d) the Partnership/Limited Liability Company Interests and all Rights of Debtor with
respect thereto, including, without limitation, all Partnership/Limited Liability Company
Interests set forth on Annex B-1 and all of Debtor’s distribution rights, income rights,
liquidation interest, accounts, contract rights, general intangibles, notes, instruments,
drafts, and documents relating to the Partnership/Limited Liability Company Interests;

     (e) (i) all copyrights (whether statutory or common law, registered or unregistered),
works protectable by copyright, copyright registrations, copyright licenses, and copyright
applications of Debtor, including, without limitation, all of Debtor’s Right, title, and
interest in and to all copyrights registered in the United States Copyright Office or
anywhere else in the world and also including, without limitation, the copyrights set forth
on Annex B-2; (ii) all renewals, extensions, and modifications thereof, (iii) all income,
licenses, royalties, damages, profits, and payments relating to or payable under any of the
foregoing; (iv) the Right to sue for past, present, or future infringements of any of the
foregoing; and (v) all other rights and benefits relating to any of the foregoing throughout
the world; in each case, whether now owned or hereafter acquired by Debtor (“Copyrights”);

     (f) (i) all patents, patent applications, patent licenses, and patentable inventions of
Debtor, including, without limitation, registrations, recordings, and applications thereof
in the United States Patent and Trademark Office or in any similar office or agency of the
United States of America, any state thereof or any other country or any political
subdivision thereof including, without limitation, those set forth on Annex B-2, and all of
the inventions and improvements described and claimed therein; (ii) all continuations,
divisions, renewals, extensions, modifications, substitutions, reexaminations,
continuations-in-part, or reissues of any of the

 
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foregoing; (iii) all income, royalties, profits, damages, awards, and payments relating
to or payable under any of the foregoing; (iv) the right to sue for past, present, and
future infringements of any of the foregoing; and (v) all other rights and benefits relating
to any of the foregoing throughout the world; in each case, whether now owned or hereafter
acquired by Debtor (“Patents”);

     (g) (i) all trademarks, trademark licenses, trade names, corporate names, company
names, business names, fictitious business names, trade styles, service marks, certification
marks, collective marks, logos, other business identifiers, all registrations, recordings,
and applications thereof including, without limitation, registrations, recordings, and
applications in the United States Patent and Trademark Office or in any similar office or
agency of the United States, any state thereof or any other country or any political
subdivision thereof including, without limitation, those set forth on Annex B-2; (ii) all
reissues, extensions, and renewals thereof; (iii) all income, royalties, damages, and
payments now or hereafter relating to or payable under any of the foregoing including,
without limitation, damages or payments for past or future infringements of any of the
foregoing; (iv) the right to sue for past, present, and future infringements of any of the
foregoing; (v) all rights corresponding to any of the foregoing throughout the world; and
(vi) all goodwill associated with and symbolized by any of the foregoing, in each case,
whether now owned or hereafter acquired by Debtor (“Trademarks”, and collectively with the
Copyrights and the Patents, the “Intellectual Property”);

     (h) intentionally deleted;

     (i) all present and future automobiles, trucks, truck tractors, trailers,
semi-trailers, or other motor vehicles or rolling stock, now owned or hereafter acquired by
such Debtor (collectively, the “Vehicles”);

     (j) any and all material deposit accounts, bank accounts, investment accounts, or
securities accounts, now owned or hereafter acquired or opened by Debtor including, without
limitation, any such accounts set forth on Annex B-1, and any account which is a replacement
or substitute for any of such accounts, together with all monies, instruments, certificates,
checks, drafts, wire transfer receipts, and other property deposited therein and all
balances therein (the “Deposit Accounts”);

     (k) all permits, licenses and other authorizations (“Authorizations”) issued by any
governmental authority, to the extent and only to the extent that the grant of a security
interest in any such Authorization does not result in the forfeiture of, or default under,
any such Authorization;

     (l) all present and future distributions, income, increases, profits, combinations,
reclassifications, improvements, and products of, accessions, attachments, and other
additions to, tools, parts, and equipment used in connection with, and substitutes and
replacements for, all or part of the Collateral described above;

     (m) all present and future accounts, contract rights, general intangibles, chattel
paper, documents, instruments, cash and noncash proceeds, and other Rights arising from or
by virtue of, or from the voluntary or involuntary sale or other disposition of, or
collections with respect to, or insurance proceeds payable with respect to, or proceeds
payable by virtue of warranty or other

 
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claims against the manufacturer of, or claims against any other Person with respect to,
all or any part of the Collateral heretofore described in this clause or otherwise; and

     (n) all present and future security for the payment to Debtor or any Subsidiary of any
of the Collateral described above and non-inventory goods which will give rise to any such
Collateral or are evidenced, identified, or represented therein or thereby. Provided,
however, Collateral does not include the Excluded Assets.

The description of the Collateral contained in this Paragraph 4 shall not be deemed to permit any
action prohibited by this Security Agreement or by the terms incorporated in this Security
Agreement. Provided, however, Collateral does not include the Excluded Assets.

     5. REPRESENTATIONS AND WARRANTIES. Debtor represents and warrants to Secured Party that:

     (a) Pipeline Credit Agreement. Certain representations and warranties in the
Pipeline Credit Agreement are applicable to the Debtor or its assets or operations, and each
such representation is true and correct, in all material respects.

     (b) Binding Obligation/Perfection. This Security Agreement creates a legal,
valid, and binding Lien in and to the Collateral in favor of Secured Party and enforceable
against Debtor, subject to applicable bankruptcy, insolvency, reorganization, moratorium or
other Laws affecting creditors’ rights generally and subject to general principles of
equity, regardless of whether considered in a proceeding in equity or at Law. For Collateral
in which the Security Interest may be perfected by the filing of Financing Statements
pursuant to Article 9 of the UCC, once those Financing Statements have been properly filed
in the jurisdictions described on Annex A hereto, the Security Interest in that Collateral
will be fully perfected and the Security Interest will constitute a first-priority Lien on
such Collateral, subject only to Permitted Liens and the lien priority provisions
hereof and of the Intercreditor Agreement. With respect to Collateral consisting of
investment property (other than Pledged Securities covered by Paragraph 5(j)), Deposit
Accounts, electronic chattel paper, letter-of-credit rights, and instruments, upon the
delivery of such Collateral to Secured Party or delivery of an executed Control Agreement
with respect to such Collateral, the Security Interest in that Collateral will be fully
perfected and the Security Interest will constitute a first-priority Lien on such
Collateral, subject only to Permitted Liens and the lien priority provisions hereof and of
the Intercreditor Agreement. None of the Collateral has been delivered nor control with
respect thereto given to any Person other than the Secured Party. Other than the Financing
Statements and Control Agreements with respect to this Security Agreement, there are no
other financing statements or control agreements covering any Collateral, other than those
evidencing Permitted Liens. The creation of the Security Interest does not require the
consent of any Person that has not been obtained.

     (c) Debtor Information. Debtor’s exact legal name, mailing address,
jurisdiction of organization, type of entity, and state issued organizational identification
number are as set forth on Annex A hereto.

     (d) Location/Fixtures. (i) Debtor’s place of business and chief executive
office is where Debtor is entitled to receive notices hereunder; the present location of
Debtor’s books and records concerning any of the Collateral that is accounts is as set forth
on Annex A hereto, and

 
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the location of all other Collateral, including, without limitation, Debtor’s inventory
and equipment (but excluding fixtures) is as set forth on Annex A hereto; and, except as
noted on Annex A hereto, all such books, records, and Collateral are in Debtor’s possession,
and (ii) substantially all the Collateral that is or may be fixtures is located on or
affixed to the real property described in deeds of trust or mortgages executed by Debtor in
favor of Secured Party pursuant to the Pipeline Credit Agreement or on Annex A hereto.

     (e) Governmental Authority. Other than the filing of Financing Statements
contemplated hereby, appropriate filings to perfect the Security Interest in the
Intellectual Property, the notation of a Lien in favor of the Secured Party on any motor
vehicle certificate of title and the filing of a fixture filing in the counties where any
fixtures or other real estate interests are located, no Authorization, approval, or other
action by, and no notice to or filing with, any Governmental Authority is required either
(i) for the pledge by Debtor of the Collateral pursuant to this Security Agreement or for
the execution, delivery, or performance of this Security Agreement by Debtor, or (ii) for
the exercise by Secured Party of the voting or other Rights provided for in this Security
Agreement or the remedies in respect of the Collateral pursuant to this Security Agreement
(except as may be required in connection with the disposition of the Pledged Securities by
Laws affecting the offering and sale of securities generally).

     (f) Maintenance of Collateral. All tangible Collateral which is useful in and
necessary to Debtor’s business is in good repair and condition, ordinary wear and tear
excepted.

     (g) Liens. Debtor owns, leases or has valid rights to use all presently
existing Collateral, and will acquire or lease all hereafter-acquired Collateral, free and
clear of all Liens, except Permitted Liens and the Liens created hereunder and
under the Intercreditor Agreement.

     (h) Collateral. Annex B-1 accurately lists all Collateral Notes, Collateral
Note Security, Pledged Shares, Partnership/Limited Liability Company Interests, commercial
tort claims, and Deposit Accounts.

     (i) Instruments, Chattel Paper, Collateral Notes, and Collateral Note Security.
All material instruments and chattel paper including, without limitation, the Collateral
Notes, have been delivered to Secured Party, together with corresponding endorsements duly
executed by Debtor in favor of Secured Party, and such endorsements have been duly and
validly executed and are binding and enforceable against Debtor in accordance with their
terms. Each material Collateral Note and the documents evidencing the Collateral Note
Security are in full force and effect; there have been no renewals or extensions of, or
amendments, modifications, or supplements which would materially adversely affect such
Collateral Notes or Collateral Note Security; and no “default” or “event of default” has
occurred and is continuing under any such Collateral Note or documents evidencing the
Collateral Note Security. Debtor has good title to the Collateral Notes and Collateral Note
Security, and such Collateral Notes and Collateral Note Security are free from any claim for
credit, deduction, or allowance of an Obligor and free from any defense, condition, dispute,
setoff, or counterclaim which could materially adversely affect the value thereof, and there
is no extension or indulgence with respect thereto.

     (j) Pledged Securities, Pledged Shares. All Collateral that is Pledged Shares
is duly authorized, validly issued, fully paid, and non-assessable (except to the extent
required by applicable Law), and the transfer thereof is not subject to any restrictions,
other than restrictions

 
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imposed hereunder and by applicable securities and corporate Laws or Permitted Liens.
The Pledged Securities securing the Obligations include 100% of the issued and outstanding
common stock or other equity interests of each Subsidiary of the Debtor owned by the Debtor. Debtor has good title to the Pledged Securities owned by Debtor, free and clear of all
Liens and encumbrances thereon (except for the Security Interest created hereby or
under the Intercreditor Agreement or Permitted Liens), and has delivered to Secured
Party (i) all stock certificates, or other instruments or documents representing or
evidencing the Pledged Securities, together with corresponding assignment or transfer powers
duly executed in blank by Debtor, and such powers have been duly and validly executed and
are binding and enforceable against Debtor in accordance with their terms, subject to
applicable bankruptcy, insolvency, reorganization, moratorium or other Laws affecting
creditors’ rights generally and subject to general principles of equity, regardless of
whether considered in a proceeding in equity or at Law or (ii) to the extent such Pledged
Securities are uncertificated, an executed Acknowledgment of Pledge in the form of Annex D
with respect to such Pledged Securities. The pledge of the Pledged Securities in accordance
with the terms hereof creates a valid and perfected first priority security interest in the
Pledged Securities securing payment of the Obligations, subject to Permitted Liens and the
lien priority provisions hereof and of the Intercreditor Agreement. For the avoidance of
doubt, as of the date of this Security Agreement there are no Pledged Securities.

     (k) Partnership/Limited Liability Company Interests. Each Partnership/Limited
Liability Company issuing a Partnership/Limited Liability Company Interest, is duly
organized, currently existing, and in good standing in the jurisdiction of its
formation; except in connection with the Restructure Transactions, there have been
no material amendments, modifications, or supplements to any agreement or certificate
creating any Partnership/Limited Liability Company or any material contract relating to the
Partnerships/Limited Liability Companies, of which Secured Party has not been advised in
writing; no event of default, default, breach, or potential default has occurred and is
continuing under any Partnership/Limited Liability Company Agreement, except for such
defaults or breaches that would result from the Restructure Transactions or would not
reasonably be expected to result in a Material Adverse Effect; and no approval or consent of
the partners of any Partnership/Limited Liability Company is required as a condition to the
validity and enforceability of the Security Interest created hereby or the consummation of
the transactions contemplated hereby which has not been duly obtained by Debtor. Debtor has
good title to the Partnership/Limited Liability Company Interests free and clear of all
Liens and encumbrances (except for the Security Interest granted hereby or under the
Intercreditor Agreement or Permitted Liens). The Partnership/Limited Liability Company
Interests are validly issued, fully paid, and nonassessable (except to the extent required
by applicable Law) and are not subject to statutory, contractual, or other restrictions
governing their transfer, ownership, or control, except as set forth in the applicable
Partnership/Limited Liability Company Agreements or applicable securities Laws or Permitted
Liens. All capital contributions required to be made by the terms of the Partnership/Limited
Liability Company Agreements for each Partnership/Limited Liability Company as of the date
hereof have been made. No Partnership/Limited Liability Company interests owned by Debtor
are evidenced by certificates. For the avoidance of doubt, as of the date of this Security
Agreement there are no Partnership/Limited Liability Company Interests.

     (1) Accounts. All Collateral that is accounts, contract rights, chattel paper,
instruments, payment intangibles, or general intangibles is free from any claim for credit,
deduction, or allowance of an Obligor, from any defense, condition, dispute, setoff, or

 
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counterclaim (collectively “Deductions”), and there is no extension or indulgence with
respect thereto, except to the extent such Deductions, extensions and indulgences could not
reasonably be expected to have a Material Adverse Effect.

     (m) Deposit Accounts. With respect to the Deposit Accounts, (i) Debtor
maintains each Deposit Account with the banks listed on Annex B-1 hereto, (ii) upon request
by the Secured Party, Debtor shall use its reasonable efforts to, within thirty (30) days of
such request, cause each such bank to acknowledge to Secured Party that each such Deposit
Account is subject to the Security Interest and Liens herein created, that the pledge of
such Deposit Account has been recorded in the books and records of such bank, and that
Secured Party shall have “control” (as defined in the UCC) over such Deposit Account, and
(iii) Debtor has the legal Right to pledge and assign to Secured Party the funds deposited
and to be deposited in each such Deposit Account.

     (n) Intellectual Property.

     (i) All of the Intellectual Property is subsisting, valid, and enforceable
(except where any failure to be subsisting, valid and enforceable would not
reasonably be expected to have a Material Adverse Effect). The information
contained on Annex B-2 hereto is true, correct and complete. All issued Patents,
Patent applications, registered Trademarks, Trademark applications, registered
Copyrights, and Copyright applications of Debtor are identified on Annex B-2 hereto.

     (ii) Except for off-the-shelf software and other Intellectual Property of which
Debtor is licensee (as to which this representation is inapplicable), the Debtor is
the sole and exclusive owner of, the entire and unencumbered Right, title, and
interest in and to its owned Intellectual Property free and clear of any Liens
including, without limitation, any pledges, assignments, licenses, user agreements,
and covenants by Debtor not to sue third Persons, other than Permitted Liens or
licenses permitted by Paragraph 8(c).

     (iii) As of the date hereof, to Debtor’s knowledge, no third party is
infringing any of Debtor’s Rights under its Intellectual Property.

     (iv) Debtor has performed and will continue to perform all acts and has paid
and will continue to pay all required fees and Taxes to maintain each material item
of the Intellectual Property in full force and effect throughout the world, as
applicable.

     (v) Each of the Patents and Trademarks identified on Annex B-2 hereto, to the
extent required in Debtor’s reasonable business judgment, has been properly
registered with the United States Patent and Trademark Office and in corresponding
offices throughout the world (where appropriate) and each of the Copyrights
identified on Annex B-2 hereto to the extent required in the Debtor’s reasonable
business judgment, has been properly registered with the United States Copyright
Office and in corresponding offices throughout the world (where appropriate).

     (vi) As of the date hereof, to Debtor’s knowledge, no claims with respect to
its Intellectual Property have been asserted and are pending (i) to the effect that
the sale, licensing, pledge, or use of any of the products of Debtor’s business
infringes any other

 
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party’s valid copyright, trademark, service mark, trade secret, or other
intellectual property Right, (ii) against the use by Debtor of any Intellectual
Property used in the Debtor’s business as currently conducted, or (iii) challenging
the ownership or use by Debtor of any of the Intellectual Property that Debtor
purports to own or use.

The foregoing representations and warranties will be true and correct in all material respects with
respect to any additional Collateral or additional specific descriptions of certain Collateral
delivered to Secured Party in the future by Debtor. The failure of any of these representations or
warranties or any description of Collateral therein to be accurate or complete shall not impair the
Security Interest in any such Collateral.

     6. COVENANTS. So long as any Pipeline Facility Lenders are committed to make loans under the
Pipeline Credit Agreement, and until the Obligations are paid and performed in full (except as
provided in Sections 10.01(d) and 10.01(e) of the Pipeline Credit Agreement), Debtor covenants and
agrees with Secured Party that Debtor will:

     (a) Pipeline Credit Agreement. (i) Comply with, perform, and be bound by all
applicable covenants and agreements in the Pipeline Credit Agreement, each of which is
hereby ratified and confirmed.

     (b) Books and Records Concerning Collateral; Inspection Rights. Debtor shall
comply with the provisions of Section 6.09 and 6.10 of the Pipeline Credit Agreement
regarding records concerning and inspection rights relating to the Collateral. In addition,
from time to time at the request of Secured Party deliver to Secured Party such information
regarding Debtor that is in the possession of Debtor as Secured Party may reasonably
request.

     (c) Annexes. Together with the delivery of compliance certificates pursuant to
Section 6.02(a) of the Pipeline Credit Agreement, update all annexes hereto if any
information therein shall become inaccurate or incomplete and such updated Annexes shall
replace the existing Annexes for all purposes of this Agreement. Notwithstanding any other
provision herein, Debtor’s failure to describe any Collateral required to be listed on any
annex hereto shall not impair Secured Party’s Security Interest in the Collateral.

     (d) Perform Obligations. Perform all of Debtor’s duties under and in
connection with each transaction to which the Collateral, or any material part thereof,
relates, in the ordinary course of business except when in Debtor’s business judgment
non-performance is justified. Notwithstanding anything to the contrary contained herein,
(i) Debtor shall remain liable under the contracts, agreements, documents, and instruments
included in the Collateral to the extent set forth therein to perform all of its duties and
obligations thereunder to the same extent as if this Security Agreement had not been
executed, (ii) the exercise by Secured Party of any of its Rights or remedies hereunder
shall not release Debtor from any of its duties or obligations under the contracts,
agreements, documents, and instruments included in the Collateral, and (iii) Secured Party
shall not have any indebtedness, liability, or obligation under any of the contracts,
agreements, documents, and instruments included in the Collateral by reason of this Security
Agreement, and Secured Party shall not be obligated to perform any of the obligations or
duties of Debtor thereunder or to take any action to collect or enforce any claim for
payment assigned hereunder.

 
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     (e) Intentionally Deleted.

     (f) Collateral in Trust. Hold in trust (and not commingle with other assets of
Debtor) for Secured Party all Collateral that is chattel paper, instruments, Collateral
Notes, Pledged Securities, or Documents (as defined in Article 9 of the UCC) at any time
received by Debtor, and promptly deliver same to Secured Party, unless Secured Party at its
option (which may be evidenced only by a writing signed by Secured Party stating that
Secured Party elects to permit Debtor to so retain) permits Debtor to retain the same, but
any chattel paper, instruments, Collateral Notes, Pledged Securities, or Documents (as
defined in Article 9 of the UCC) and (to the extent required under paragraph (t) hereof) so
retained shall be marked to state that they are assigned to Secured Party; each such
instrument shall be endorsed to the order of Secured Party (but the failure of same to be so
marked or endorsed shall not impair the Security Interest thereon).

     (g) Control. Execute all documents and take any action required by Secured
Party in order for Secured Party to obtain “control” (as defined in the UCC) with respect to
Collateral consisting of Deposit Accounts, investment property, uncertificated Pledged
Securities, and letter-of-credit rights. If Debtor at any time holds or acquires an interest
in any electronic chattel paper or any “transferable record,” as that term is defined in the
federal Electronic Signatures in Global and National Commerce Act, or in the Uniform
Electronic Transactions Act as in effect in any relevant jurisdiction, promptly notify
Secured Party thereof and, at the request of Secured Party, take such action as Secured
Party may reasonably request to vest in Secured Party control under the UCC of such
electronic chattel paper or control under the federal Electronic Signatures in Global and
National Commerce Act or, as the case may be, the Uniform Electronic Transactions Act, as so
in effect in such jurisdiction, of such transferable record.

     (h) Further Assurances. At Debtor’s expense and Secured Party’s request, before
or after a Default or Event of Default: (i) file or cause to be filed such applications and
take such other actions as Secured Party may reasonably request to obtain the consent or
approval of any Governmental Authority to Secured Party’s Rights hereunder including,
without limitation, the Right to sell all the Collateral upon an Event of Default without
additional consent or approval from such Governmental Authority (and, because Debtor agrees
that Secured Party’s remedies at Law for failure of Debtor to comply with this provision
would be inadequate and that such failure would not be adequately compensable in damages,
Debtor agrees that its covenants in this provision may be specifically enforced); (ii) from
time to time promptly execute and deliver to Secured Party all such other assignments,
certificates, supplemental documents, and financing statements, and do all other acts or
things as Secured Party may reasonably request in order to more fully create, evidence,
perfect, continue, and preserve the priority of the Security Interest and to carry out the
provisions of this Security Agreement; and (iii) pay all filing fees in connection with any
financing, continuation, or termination statement or other instrument with respect to the
Security Interests.

     (i) Encumbrances. Not create, permit, or suffer to exist, and shall defend the
Collateral against, any Lien or other encumbrance on the Collateral, other than Permitted
Liens, and shall defend Debtor’s Rights in the Collateral and Secured Party’s Security
Interest in the Collateral against the claims and demands of all Persons except those
holding or claiming Permitted Liens. Debtor shall do nothing to impair the Rights of Secured
Party in the Collateral.

 
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     (j) Estoppel and Other Agreements and Matters. Upon the reasonable request of
Secured Party, either (i) use commercially reasonable efforts to cause the landlord or
lessor for each location where any material inventory or equipment is maintained to execute
and deliver to Secured Party an estoppel and subordination agreement in such form as may be
reasonably acceptable to Secured Party and its counsel, or (ii) deliver to Secured Party a
legal opinion or other evidence (in each case that is reasonably satisfactory to Secured
Party and it counsel) that neither the applicable lease nor the Laws of the jurisdiction in
which that location is situated provide for contractual, common Law, or statutory landlord’s
Liens that is senior to or pari passu with the Security Interest.

     (k) Fixtures. For any Collateral that is a fixture or an accession which has
been attached to real estate or other goods prior to the perfection of the Security
Interest, use commercially reasonable efforts to furnish to Secured Party, upon reasonable
demand, a disclaimer of interest in each such fixture or accession and a consent in writing
to the Security Interest of Secured Party therein, signed by all Persons having any interest
in such fixture or accession by virtue of any interest in the real estate or other goods to
which such fixture or accession has been attached.

     (l) Certificates of Title. Upon the request of Secured Party, if a certificate
of title is issued or outstanding with respect to any Vehicle with a fair market value of at
least $50,000, cause the Security Interest to be properly noted thereon.

     (m) Warehouse Receipts Non-Negotiable. If any warehouse receipt or receipt in
the nature of a warehouse receipt is issued in respect of any of the Collateral, agree that
such warehouse receipt or receipt in the nature thereof shall not be “negotiable” (as such
term is used in Section 7-104 of the UCC) unless such warehouse receipt or receipt in the
nature thereof is delivered to Secured Party.

     (n) Impairment of Collateral. Not use any material portion of the Collateral,
or permit the same to be used, for any unlawful purpose, in any manner that is reasonably
likely to materially adversely impair the value or usefulness of the Collateral, or in any
manner inconsistent with the provisions or requirements of any policy of insurance thereon
nor affix or install any accessories, equipment, or device on the Collateral or on any
component thereof if such addition will materially impair the original intended function or
use of the Collateral or such component.

     (o) Collateral Notes and Collateral Note Security. Without the prior written
consent of Secured Party not (i) materially modify or substitute, or permit material
modification or substitution of, any Collateral Note or any document evidencing the
Collateral Note Security, if the effect thereof would be to materially adversely affect the
value of the Collateral Notes and Collateral Note Security taken as a whole, or (ii) release
any material portion of any Collateral Note Security unless paid in full or otherwise
specifically required by the terms thereof, except in the exercise of the Debtor’s
reasonable business judgment.

     (p) Securities. Except as permitted by the Pipeline Credit Agreement, not sell,
exchange, or otherwise dispose of, any of the Pledged Securities; and take any action
requested by Secured Party to allow Secured Party to fully enforce its Security Interest in
the Pledged

 
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Securities including, without limitation, the filing of any claims with any court,
liquidator, trustee, custodian, receiver, or other like person or party.

     (q) Depository Bank. With respect to any Deposit Accounts, (i) maintain the
Deposit Accounts at the banks (a “Depository Bank”) described on Annex B-1 or such
additional depository banks as described in the notices given pursuant to clause (iv) of
this Section 6(q) as have complied with item (iv) hereof, (ii) upon request of the Secured
Party, deliver to each depository bank a letter in the form of Annex C hereto with respect
to Secured Party’s Rights in such Deposit Account (or such other reasonable form as may be
provided by the Depository Bank) and use commercially reasonable efforts to obtain the
execution of such letter by each Depository Bank that the pledge of such Deposit Account has
been recorded in the books and records of such bank and that Secured Party shall have
dominion and control over such Deposit Account; (iii) upon request of the Secured Party,
deliver to Secured Party all certificates or instruments, if any, now or hereafter
representing or evidencing the Deposit Accounts, accompanied by duly executed instruments of
transfer or assignment in blank, all in form and substance reasonably satisfactory to
Secured Party; and (iv) notify Secured Party upon establishing any additional Deposit
Accounts and, at the request of Secured Party, use commercially reasonable efforts to obtain
from such depository bank an executed letter substantially in the form of Annex C (or such
other reasonable form as may be provided by the Depository Bank) and deliver the same to
Secured Party. Secured Party agrees not to exercise control over such Deposit Account
unless an Event of Default shall have occurred and be continuing.

     (t) Marking of Chattel Paper. At the request of Secured Party, not create any
chattel paper without placing a legend on the chattel paper acceptable to Secured Party
indicating that Secured Party has a security interest in the chattel paper.

     (u) Modification of Accounts. In accordance with prudent business practices,
endeavor to collect or cause to be collected from each account debtor under its accounts, as
and when due, any and all amounts owing under such accounts. Except in the ordinary course
of business consistent with prudent business practices and industry standards, without the
prior written consent of Secured Party, Debtor shall not (i) grant any extension of time for
any payment with respect to any of the accounts, (ii) compromise, compound, or settle any of
the accounts for less than the full amount thereof, (iii) release, in whole or in part, any
Person liable for payment of any of the accounts, (iv) allow any credit or discount for
payment with respect to any account other than trade discounts granted in the ordinary
course of business, (v) release any Lien or guaranty securing any account, or (vi) modify or
substitute, or permit the modification or substitution of, any contract to which any of the
Collateral which is accounts relates.

     (v) Intellectual Property.

     (i) Prosecute diligently all applications in respect of Intellectual Property,
now or hereafter pending;

     (ii) Except to the extent not required in Debtor’s reasonable business
judgment, make federal applications on all of its unpatented but patentable
inventions and all of its registrable but unregistered Copyrights and Trademarks;

 
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     (iii) Preserve and maintain all of its material Rights in the Intellectual
Property and protect the Intellectual Property from infringement, unfair
competition, cancellation, or dilution by all appropriate action necessary in
Debtor’s reasonable business judgment including, without limitation, the
commencement and prosecution of legal proceedings to recover damages for
infringement and to defend and preserve its rights in the Intellectual Property;

     (iv) Not abandon any of the Intellectual Property necessary to the conduct of
its business in the exercise of Debtor’s reasonable business judgment;

     (v) Maintain the quality of any and all products and services with respect to
which the Intellectual Property is used except to the extent not required in
Debtor’s reasonable business judgment;

     (vi) Not enter into any agreement including, but not limited to any licensing
agreement, that is inconsistent with Debtor’s obligations under this Security
Agreement or any of the other First Lien Documents;

     (vii) Give Secured Party prompt written notice if Debtor shall obtain Rights to
or become entitled to the benefit of any Intellectual Property not identified on
Annex B-2 hereto; and

     (viii) If an Event of Default exists, use its reasonable efforts to obtain any
consents, waivers, or agreements necessary to enable Secured Party to exercise its
rights and remedies with respect to the Intellectual Property.

     7. DEFAULT; REMEDIES. If an Event of Default exists, Secured Party may, at its election (but
subject to the terms and conditions of the Intercreditor Agreement and Pipeline Credit Agreement),
exercise any and all Rights available to a secured party under the UCC and other applicable Law, in
addition to any and all other Rights afforded by the First Lien Documents, at law, in equity, or
otherwise including, without limitation, (a) requiring Debtor to assemble all or part of the
Collateral and make it available to Secured Party at a place to be designated by Secured Party
which is reasonably convenient to Debtor and Secured Party, (b) to the extent permitted by Debtor’s
insurance carrier, surrendering any policies of insurance on all or part of the Collateral and
receiving and applying the unearned premiums as a credit on the Obligations, (c) applying by
appropriate judicial proceedings for appointment of a receiver for all or part of the Collateral
(and Debtor hereby consents to any such appointment), and (d) applying to the Obligations any cash
held by Secured Party under this Security Agreement, including, without limitation, any cash in the
Cash Collateral Account (defined in Section 8(h)).

     (a) Notice. Reasonable notification of the time and place of any public sale of
the Collateral, or reasonable notification of the time after which any private sale or other
intended disposition of the Collateral is to be made, shall be sent to Debtor and to any
other Person entitled to notice under the UCC; provided that, if any of the Collateral
threatens to decline speedily in value or is of the type customarily sold on a recognized
market, Secured Party may sell or otherwise dispose of the Collateral without notification,
advertisement, or other notice of any kind. It is agreed that notice sent or given not less
than ten Business Days prior to the taking of

 
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the action to which the notice relates is reasonable notification and notice for the
purposes of this subparagraph.

     (b) Condition of Collateral; Warranties. Secured Party has no obligation to
clean-up or otherwise prepare the Collateral for sale. Secured Party may sell the Collateral
without giving any warranties as to the Collateral. Secured Party may specifically disclaim
any warranties of title or the like. This procedure will not be considered to affect
adversely the commercial reasonableness of any sale of the Collateral.

     (c) Compliance with Other Laws. Secured Party may comply with any applicable
state or federal law requirements in connection with a disposition of the Collateral and
compliance will not be considered to adversely affect the commercial reasonableness of any
sale of the Collateral.

     (d) Sales of Pledged Securities.

     (i) Debtor agrees that, because of the Securities Act of 1933, as amended, or
the rules and regulations promulgated thereunder (collectively, the “Securities
Act”), or any other Laws or regulations, and for other reasons, there may be legal
or practical restrictions or limitations affecting Secured Party in any attempts to
dispose of certain portions of the Pledged Securities and for the enforcement of its
Rights. For these reasons, Secured Party is hereby authorized by Debtor, but not
obligated, upon the occurrence and during the continuation of an Event of Default,
to sell all or any part of the Pledged Securities at private sale, subject to an
investment letter or in any other manner which will not require the Pledged
Securities, or any part thereof, to be registered in accordance with the Securities
Act or any other Laws or regulations, at a reasonable price at such private sale or
other distribution in the manner mentioned above. Debtor understands that Secured
Party may in its discretion approach a limited number of potential purchasers and
that a sale under such circumstances may yield a lower price for the Pledged
Securities, or any part thereof, than would otherwise be obtainable if such
Collateral were either offered to a larger number of potential purchasers,
registered under the Securities Act, or sold in the open market. Debtor agrees that
any such private sale made under this Paragraph 7(d) shall be deemed to have been
made in a commercially reasonable manner, and that Secured Party has no obligation
to delay the sale of any Pledged Securities to permit the issuer thereof to register
it for public sale under any applicable federal or state securities Laws.

     (ii) Secured Party is authorized, in connection with any such sale, (A) to
restrict the prospective bidders on or purchasers of any of the Pledged Securities
to a limited number of sophisticated investors who will represent and agree that
they are purchasing for their own account for investment and not with a view to the
distribution or sale of any of such Pledged Securities, and (B) to impose such other
limitations or conditions in connection with any such sale as Secured Party
reasonably deems necessary in order to comply with applicable Law. Debtor covenants
and agrees that it will execute and deliver such documents and take such other
action as Secured Party reasonably deems necessary in order that any such sale may
be made in compliance with applicable Law. Upon any such sale, Secured Party shall
have the Right to deliver, assign, and transfer to the purchaser thereof the Pledged
Securities so sold in accordance with any

 
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applicable federal and state securities laws. Each purchaser at any such sale
shall hold the Pledged Securities so sold absolutely free from any claim or Right of
Debtor of whatsoever kind, including any equity or Right of redemption of Debtor.
Debtor, to the extent permitted by applicable Law, hereby specifically waives all
Rights of redemption, stay, or appraisal which it has or may have under any Law now
existing or hereafter enacted.

     (iii) Debtor agrees that ten (10) Business Days’ written notice from Secured
Party to Debtor of Secured Party’s intention to make any such public or private sale
or sale at a broker’s board or on a securities exchange shall constitute reasonable
notice under the UCC. Such notice shall (A) in case of a public sale, state the time
and place fixed for such sale, (B) in case of sale at a broker’s board or on a
securities exchange, state the board or exchange at which such a sale is to be made
and the day on which the Pledged Securities, or the portion thereof so being sold,
will first be offered to sale at such board or exchange, and (C) in the case of a
private sale, state the day after which such sale may be consummated. Any such
public sale shall be held at such time or times within ordinary business hours and
at such place or places as Secured Party may fix in the notice of such sale. At any
such sale, the Pledged Securities may be sold in one lot as an entirety or in
separate parcels, as Secured Party may reasonably determine. Secured Party shall not
be obligated to make any such sale pursuant to any such notice. Secured Party may,
without notice or publication, adjourn any public or private sale or cause the same
to be adjourned from time to time by announcement at the time and place fixed for
the sale, and such sale may be made at any time or place to which the same may be so
adjourned.

     (iv) In case of any sale of all or any part of the Pledged Securities on credit
or for future delivery, the Pledged Securities so sold may be retained by Secured
Party until the selling price is paid by the purchaser thereof, but Secured Party
shall not incur any liability in case of the failure of such purchaser to take up
and pay for the Pledged Securities so sold and in case of any such failure, such
Pledged Securities may again be sold upon like notice. Secured Party, instead of
exercising the power of sale herein conferred upon it, may proceed by a suit or
suits at law or in equity to foreclose the Security Interests and sell the Pledged
Securities, or any portion thereof, under a judgment or decree of a court or courts
of competent jurisdiction.

     (v) Without limiting the foregoing, or imposing upon Secured Party any
obligations or duties not required by applicable Law, Debtor acknowledges and agrees
that, in foreclosing upon any of the Pledged Securities, or exercising any other
Rights or remedies provided Secured Party hereunder or under applicable Law, Secured
Party may, but shall not be required to, (A) qualify or restrict prospective
purchasers of the Pledged Securities by requiring evidence of sophistication or
creditworthiness, and requiring the execution and delivery of confidentiality
agreements or other documents and agreements as a condition to such prospective
purchasers’ receipt of information regarding the Pledged Securities or participation
in any public or private foreclosure sale process, (B) provide to prospective
purchasers business and financial information regarding Debtor and its Subsidiaries
available in the files of Secured Party at the time of commencing the foreclosure
process, without the requirement that Secured Party obtain, or seek to obtain, any
updated business or financial information or verify, or certify to prospective

 
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purchasers, the accuracy of any such business or financial information, or (C)
offer for sale and sell the Pledged Securities with or without first employing an
appraiser, investment banker, or broker with respect to the evaluation of the
Pledged Securities, the solicitation of purchasers for Pledged Securities, or the
manner of sale of Pledged Securities.

     (e) Application of Proceeds. Secured Party shall apply the proceeds of any sale
or other disposition of the Collateral under this Paragraph 7 in the order set forth in
Section 4.03 of the Intercreditor Agreement, or if the Intercreditor Agreement has been
terminated pursuant to its terms, then as follows: first, to the payment of all expenses
incurred in retaking, holding, and preparing any of the Collateral for sale(s) or other
disposition, in arranging for such sale(s) or other disposition, and in actually selling or
disposing of the same (all of which are part of the Obligations); second, toward repayment
of amounts expended by Secured Party under Paragraph 8; and third, toward payment of the
balance of the Obligations in the order and manner specified in the Pipeline Credit
Agreement. Any surplus remaining shall be delivered to Debtor or as a court of competent
jurisdiction may direct. If the proceeds are insufficient to pay the Obligations in full,
Debtor shall remain liable for any deficiency.

     (f) Sales on Credit. If Secured Party sells any of the Collateral upon credit,
Debtor will be credited only with payments actually made by the purchaser, received by the
Secured Party, and applied to the indebtedness of the purchaser. In the event the purchaser
fails to pay for the Collateral, Secured Party may resell the Collateral and Debtor shall be
credited with the proceeds of the sale.

     8. OTHER RIGHTS OF SECURED PARTY.

     (a) Performance. If Debtor fails to keep the Collateral in good repair, working
order, and condition, as required by the First Lien Documents, or fails to pay when due all
Taxes on any of the Collateral in the manner required by the First Lien Documents, or fails
to preserve the priority of the Security Interest in any of the Collateral, or fails to keep
the Collateral insured as required by the First Lien Documents, or otherwise fails to
perform any of its obligations under the First Lien Documents with respect to the
Collateral, then Secured Party may, at its option, but without being required to do so, make
such repairs, pay such Taxes, prosecute or defend any suits in relation to the Collateral,
or insure and keep insured the Collateral in any amount deemed appropriate by Secured Party,
or take all other action which Debtor is required, but has failed or refused, to take under
the First Lien Documents. Any sum which may be expended or paid by Secured Party under this
subparagraph (including, without limitation, court costs and reasonable attorneys’ fees)
shall bear interest from the dates of expenditure or payment at the Default Rate until paid
and, together with such interest, shall be payable by Debtor to Secured Party upon demand
and shall be part of the Obligations.

     (b) Collection. If an Event of Default exists and upon notice from Secured
Party, each Obligor with respect to any payments on any of the Collateral (including,
without limitation, dividends and other distributions with respect to the Pledged Securities
and Partnership/Limited Liability Company Interests, payments on Collateral Notes, insurance
proceeds payable by reason of loss or damage to any of the Collateral, or payments or
distributions with respect to Deposit Accounts) is hereby authorized and directed by Debtor
to make payment directly to Secured Party, regardless of whether Debtor was previously
making collections thereon. Subject to

 
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Paragraph 8(f) hereof, until such notice is given, Debtor is authorized to retain and
expend all payments made on Collateral. If an Event of Default exists, Secured Party shall
have the Right in its own name or in the name of Debtor to compromise or extend time of
payment with respect to all or any portion of the Collateral for such amounts and upon such
terms as Secured Party may determine; to demand, collect, receive, receipt for, sue for,
compound, and give acquittances for any and all amounts due or to become due with respect to
Collateral; to take control of cash and other proceeds of any Collateral; to endorse the
name of Debtor on any notes, acceptances, checks, drafts, money orders, or other evidences
of payment on Collateral that may come into the possession of Secured Party; to sign the
name of Debtor on any invoice or bill of lading relating to any Collateral, on any drafts
against Obligors or other Persons making payment with respect to Collateral, on assignments
and verifications of accounts or other Collateral and on notices to Obligors making payment
with respect to Collateral; to send requests for verification of obligations to any Obligor;
and to do all other acts and things necessary to carry out the intent of this Security
Agreement. If an Event of Default exists and any Obligor fails or refuses to make payment on
any Collateral when due, Secured Party is authorized, in its sole discretion, either in its
own name or in the name of Debtor, to take such action as Secured Party shall deem
appropriate for the collection of any amounts owed with respect to Collateral or upon which
a delinquency exists. Regardless of any other provision hereof, however, Secured Party shall
never be liable for its failure to collect, or for its failure to exercise diligence in the
collection of, any amounts owed with respect to Collateral, nor shall it be under any duty
whatsoever to anyone except Debtor to account for funds that it shall actually receive
hereunder. Without limiting the generality of the foregoing, Secured Party shall have no
responsibility for ascertaining any maturities, calls, conversions, exchanges, offers,
tenders, or similar matters relating to any Collateral, or for informing Debtor with respect
to any of such matters (irrespective of whether Secured Party actually has, or may be deemed
to have, knowledge thereof). The receipt of Secured Party to any Obligor shall be a full and
complete release, discharge, and acquittance to such Obligor, to the extent of any amount so
paid to Secured Party.

     (c) Intellectual Property. For purposes of enabling Secured Party to exercise
its Rights and remedies under this Security Agreement and enabling Secured Party and its
successors and assigns to enjoy the full benefits of the Collateral, Debtor hereby grants to
Secured Party an irrevocable, nonexclusive license (exercisable without payment of royalty
or other compensation to Debtor upon an Event of Default) to use, license, or sublicense any
of the Intellectual Property. Debtor shall provide Secured Party with reasonable access to
all media in which any of the Intellectual Property may be recorded or stored and all
computer programs used for the completion or printout thereof. This license shall also inure
to the benefit of all successors, assigns, and transferees of Secured Party. If an Event of
Default exists, Secured Party may require that Debtor assign all of its Right, title, and
interest in and to the Intellectual Property or any part thereof to Secured Party or such
other Person as Secured Party may designate pursuant to documents satisfactory to Secured
Party. If no Default or Event of Default exists, Debtor shall have the exclusive,
non-transferable Right and license to use the Intellectual Property in the ordinary course
of business and the exclusive Right to grant to other Persons licenses and sublicenses with
respect to the Intellectual Property for full and fair consideration.

     (d) Record Ownership of Securities. If an Event of Default exists, Secured
Party at any time may have any Collateral that is Pledged Securities and that is in the
possession of Secured Party, or its nominee or nominees, registered in its name, or in the
name of its nominee or nominees, as Secured Party; and, as to any Collateral that is Pledged
Securities so registered,

 
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Secured Party shall execute and deliver (or cause to be executed and delivered) to
Debtor all such proxies, powers of attorney, dividend coupons or orders, and other documents
as Debtor may reasonably request for the purpose of enabling Debtor to exercise the voting
Rights and powers which it is entitled to exercise under this Security Agreement or to
receive the dividends and other distributions and payments in respect of such Collateral
that is Pledged Securities or proceeds thereof which it is authorized to receive and retain
under this Security Agreement.

     (e) Voting of Securities. As long as no Event of Default exists, Debtor is
entitled to exercise all voting Rights pertaining to any Pledged Securities and
Partnership/Limited Liability Company Interests; provided however, that no vote shall be
cast or consent, waiver, or ratification given or action taken without the prior written
consent of Secured Party which would be inconsistent with or violate any provision of this
Security Agreement or the Pipeline Credit Agreement; and provided further that Debtor shall
give Secured Party at least five Business Days’ prior written notice in the form of an
officers’ certificate of the manner in which it intends to exercise, or the reasons for
refraining from exercising, any voting or other consensual Rights pertaining to the
Collateral or any part thereof which might have a Material Adverse Effect on the value of
the Collateral or any part thereof. If an Event of Default exists and if Secured Party
elects to exercise such Right, the Right to vote any Pledged Securities shall be vested
exclusively in Secured Party. To this end, Debtor hereby irrevocably constitutes and
appoints Secured Party the proxy and attorney-in-fact of Debtor, with full power of
substitution, to vote, and to act with respect to, any and all Collateral that is Pledged
Securities standing in the name of Debtor or with respect to which Debtor is entitled to
vote and act, subject to the understanding that such proxy may not be exercised unless an
Event of Default exists. The proxy herein granted is coupled with an interest, is
irrevocable, and shall continue until the Obligations have been paid and performed in full.

     (f) Certain Proceeds. Notwithstanding any contrary provision herein, any and
all

     (i) dividends, interest, or other distributions paid or payable other than in
cash in respect of, and instruments and other property received, receivable, or
otherwise distributed in respect of, or in exchange for, any Collateral;

     (ii) dividends, interest, or other distributions hereafter paid or payable in
cash in respect of any Collateral in connection with a partial or total liquidation
or dissolution, or in connection with a reduction of capital, capital surplus, or
paid-in-surplus;

     (iii) cash paid, payable, or otherwise distributed in redemption of, or in
exchange for, any Collateral; and

     (iv) dividends, interest, or other distributions paid or payable in violation
of the First Lien Documents,

shall be part of the Collateral hereunder, and shall, if received by Debtor, be held in
trust for the benefit of Secured Party, and shall forthwith be delivered to Secured Party
(accompanied by proper instruments of assignment and/or stock and/or bond powers executed by
Debtor in accordance with Secured Party’s instructions) to be held subject to the terms of
this Security Agreement. Any cash proceeds of Collateral which come into the possession of
Secured Party

 
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during the continuance of an Event of Default (including, without limitation, insurance
proceeds) may, at Secured Party’s option, be applied in whole or in part to the Obligations
(to the extent then due), be released in whole or in part to or on the written instructions
of Debtor for any general or specific purpose, or be retained in whole or in part by Secured
Party as additional Collateral. Any cash Collateral in the possession of Secured Party may
be invested by Secured Party in certificates of deposit issued by Secured Party (if Secured
Party issues such certificates) or by any state or national bank having combined capital and
surplus greater than $100,000,000 with a short term rating from Moody’s and S&P of P-1 and
A-1+, respectively, or in securities issued or guaranteed by the United States or any agency
thereof. Secured Party shall never be obligated to make any such investment and shall never
have any liability to Debtor for any loss which may result therefrom. All interest and other
amounts earned from any investment of Collateral may be dealt with by Secured Party in the
same manner as other cash Collateral. Except as specifically provided herein, the provisions
of this subparagraph are applicable whether or not a Default or Event of Default exists.

     (g) Use and Operation of Collateral. Should any Collateral come into the
possession of Secured Party, Secured Party may use or operate such Collateral for the
purpose of preserving it or its value pursuant to the order of a court of appropriate
jurisdiction or in accordance with any other Rights held by Secured Party in respect of such
Collateral. Debtor covenants to promptly reimburse and pay to Secured Party, at Secured
Party’s request, the amount of all reasonable expenses (including, without limitation, the
cost of any insurance and payment of Taxes or other charges) incurred by Secured Party in
connection with its custody and preservation of Collateral, and all such expenses, costs,
Taxes, and other charges shall bear interest at the Default Rate until repaid and, together
with such interest, shall be payable by Debtor to Secured Party upon demand and shall become
part of the Obligations. However, the risk of accidental loss or damage to, or diminution in
value of, Collateral is on Debtor, and Secured Party shall have no liability whatever for
failure to obtain or maintain insurance, nor to determine whether any insurance ever in
force is adequate as to amount or as to the risks insured. With respect to Collateral that
is in the possession of Secured Party, Secured Party will use reasonable care in the custody
and preservation of such Collateral but shall have no duty to fix or preserve Rights against
prior parties to such Collateral and shall never be liable for any failure to use diligence
to collect any amount payable in respect of such Collateral, but shall be liable only to
account to Debtor for what it may actually collect or receive thereon. The provisions of
this subparagraph are applicable whether or not an Event of Default exists.

     (h) Cash Collateral Account. If an Event of Default exists and is continuing,
Secured Party shall have, and Debtor hereby grants to Secured Party, the Right and authority
to transfer all funds on deposit in the Deposit Accounts to a Cash Collateral Account
(herein so called) maintained with a depository institution acceptable to Secured Party and
subject to the exclusive direction, domain, and control of Secured Party, and no
disbursements or withdrawals shall be permitted to be made by Debtor from such Cash
Collateral Account; provided, however, Secured Party shall permit disbursements and
withdrawals from the Cash Collateral Account to the extent necessary to comply with
applicable Law, such as for the payment of payroll taxes and other obligations for which
Debtor (or a member of its governing body) would be liable under applicable Law. Such Cash
Collateral Account shall be subject to the Security Interest and Liens in favor of Secured
Party herein created, and Debtor hereby grants a security interest to Secured Party on
behalf of the Beneficiaries in and to, such Cash Collateral Account and all checks, drafts,
and other items ever received by Debtor for deposit therein. Furthermore, if an Event of

 
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Default exists, Secured Party shall have the Right, at any time in its discretion
without notice to Debtor, (i) to transfer to or to register in the name of Secured Party or
any Beneficiary or nominee any certificates of deposit or deposit instruments constituting
Deposit Accounts and shall have the Right to exchange such certificates or instruments
representing Deposit Accounts for certificates or instruments of smaller or larger
denominations and (ii) to take and apply against the Obligations any and all funds then or
thereafter on deposit in the Cash Collateral Account or otherwise constituting Deposit
Accounts. If not notified before taking any of the foregoing actions, Secured
Party shall promptly, and in any event within two (2) Business Days, notify Debtor after
taking any of the foregoing actions

     (i) Power of Attorney. Debtor hereby irrevocably constitutes and appoints
Secured Party and any officer or agent thereof, with full power of substitution, as its true
and lawful attorney-in-fact with full irrevocable power and authority in the name of Debtor
or in its own name, to take after the occurrence and during the continuance of an Event of
Default any and all action and to execute any and all documents and instruments which
Secured Party at any time and from time to time deems necessary or desirable to accomplish
the purposes of this Security Agreement and, without limiting the generality of the
foregoing, Debtor hereby gives Secured Party the power and Right on behalf of Debtor and in
its own name to do any of the following from time to time after the occurrence and during
the continuance of an Event of Default without notice to or the consent of Debtor:

     (i) to transfer any and all funds on deposit in the Deposit Accounts to the
Cash Collateral Account as set forth in herein;

     (ii) to receive, endorse, and collect any drafts or other instruments or
documents in connection with clause (b) above and this clause (i);

     (iii) to use the Intellectual Property or to grant or issue any exclusive (if
Debtor has exclusive rights to such Intellectual Property) or non-exclusive license
under the Intellectual Property to anyone else, and to perform any act necessary for
the Secured Party to assign, pledge, convey, or otherwise transfer title in or
dispose of the Intellectual Property to any other Person;

     (iv) to demand, sue for, collect, or receive, in the name of Debtor or in its
own name, any money or property at any time payable or receivable on account of or
in exchange for any of the Collateral and, in connection therewith, endorse checks,
notes, drafts, acceptances, money orders, documents of title or any other
instruments for the payment of money under the Collateral or any policy of
insurance;

     (v) to pay or discharge taxes, Liens, or other encumbrances levied or placed on
or threatened against the Collateral;

     (vi) to notify post office authorities to change the address for delivery of
mail to Debtor to an address designated by Secured Party and to receive, open, and
(with respect to mail relating to payments on Collateral) take action with respect
to mail addressed to Debtor; provided however, Secured Party shall promptly deliver
to Debtor any mail not relating to Collateral or the preservation or enforcement of
Secured Party’s rights with respect to the Collateral; and

 
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     (vii) (A) to direct account debtors and any other parties liable for any
payment under any of the Collateral to make payment of any and all monies due and to
become due thereunder directly to Secured Party or as Secured Party shall direct;
(B) to receive payment of and receipt for any and all monies, claims, and other
amounts due and to become due at any time in respect of or arising out of any
Collateral; (C) to sign and endorse any invoices, freight or express bills, bills of
lading, storage or warehouse receipts, drafts against debtors, assignments, proxies,
stock powers, verifications, and notices in connection with accounts and other
documents relating to the Collateral; (D) to commence and prosecute any suit,
action, or proceeding at Law or in equity in any court of competent jurisdiction to
collect the Collateral or any part thereof and to enforce any other Right in respect
of any Collateral; (E) to defend any suit, action, or proceeding brought against
Debtor with respect to any Collateral; (F) to settle, compromise, or adjust any
suit, action, or proceeding described above and, in connection therewith, to give
such discharges or releases as Secured Party may deem appropriate; (G) to exchange
any of the Collateral for other property upon any merger, consolidation,
reorganization, recapitalization, or other readjustment of the issuer thereof and,
in connection therewith, deposit any of the Collateral with any committee,
depositary, transfer agent, registrar, or other designated agency upon such terms as
Secured Party may determine; (H) to add or release any guarantor, endorser, surety,
or other party to any of the Collateral; (I) to renew, extend, or otherwise change
the terms and conditions of any of the Collateral; (J) to endorse Debtor’s name on
all applications, documents, papers, and instruments necessary or desirable in order
for Secured Party to use or maintain any of the Intellectual Property; (K) to make,
settle, compromise or adjust any claims under or pertaining to any of the Collateral
(including claims under any policy of insurance); (L) to execute on behalf of Debtor
any financing statements or continuation statements with respect to the Security
Interests created hereby, and to do any and all acts and things to protect and
preserve the Collateral including, without limitation, the protection and
prosecution of all Rights included in the Collateral; and (M) to sell, transfer,
pledge, convey, make any agreement with respect to or otherwise deal with any of the
Collateral as fully and completely as though Secured Party were the absolute owner
thereof for all purposes, and to do, at Secured Party’s option and Debtor’s expense,
at any time, or from time to time, all acts and things which Secured Party deems
necessary to protect, preserve, maintain, or realize upon the Collateral and Secured
Party’s security interest therein.

This power of attorney is a power coupled with an interest and shall be irrevocable. Secured
Party shall be under no duty to exercise or withhold the exercise of any of the Rights,
powers, privileges, and options expressly or implicitly granted to Secured Party in this
Security Agreement, and shall not be liable for any failure to do so or any delay in doing
so. Neither Secured Party nor any Person designated by Secured Party shall be liable for any
act or omission or for any error of judgment or any mistake of fact or Law except
for the failure to account to Debtor for funds received by Secured Party and except for
failure to use reasonable care in the custody and preservation of Collateral in its
possession. This power of attorney is conferred on Secured Party solely to protect,
preserve, maintain, and realize upon its Security Interest in the Collateral. Secured Party
shall not be responsible for any decline in the value of the Collateral and shall not be
required to take any steps to preserve rights against prior parties or to protect, preserve,
or maintain any Lien given to secure the Collateral.

 
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     (j) Purchase Money Collateral. To the extent that Secured Party or any
Beneficiary has advanced or will advance funds to or for the account of Debtor to enable
Debtor to purchase or otherwise acquire Rights in Collateral, Secured Party or such
Beneficiary, at its option, may pay such funds (i) directly to the Person from whom Debtor
will make such purchase or acquire such Rights, or (ii) to Debtor, in which case Debtor
covenants to promptly pay the same to such Person, and forthwith furnish to Secured Party
evidence satisfactory to Secured Party that such payment has been made from the funds so
provided.

     (k) Subrogation. If any of the Obligations are given in renewal or extension or
applied toward the payment of indebtedness secured by any Lien, Secured Party shall be, and
is hereby, subrogated to all of the Rights, titles, interests, and Liens securing the
indebtedness so renewed, extended, or paid.

     (1) Indemnification. Debtor hereby assumes all liability for the Collateral,
for the Security Interest, and for any use, possession, maintenance, and management of, all
or any of the Collateral including, without limitation, any Taxes arising as a result of, or
in connection with, the transactions contemplated herein, and agrees to assume liability
for, and to indemnify and hold Secured Party and each Beneficiary harmless from and against,
any and all claims, causes of action, or liability, for injuries to or deaths of Persons and
damage to property, howsoever arising from or incident to such use, possession, maintenance,
and management, whether such Persons be agents or employees of Debtor or of third parties,
or such damage be to property of Debtor or of others. Debtor agrees to indemnify, save, and
hold Secured Party and each Beneficiary harmless from and against, and covenants to defend
Secured Party and each Beneficiary against, any and all losses, damages, claims, costs,
penalties, liabilities, and expenses (collectively, “Claims”), including, without
limitation, court costs and attorneys’ fees, and any of the foregoing arising from the
negligence of Secured Party or any Beneficiary, or any of their respective officers,
employees, agents, advisors, employees, or representatives, howsoever arising or incurred
because of, incident to, or with respect to Collateral owned by Debtor or any use,
possession, maintenance, or management thereof; provided however, that the indemnity set
forth in this Paragraph 8(l) will not apply to Claims caused by the gross negligence or
willful misconduct of Secured Party or any Beneficiary.

     9. MISCELLANEOUS.

     (a) Continuing Security Interest. This Security Agreement creates a continuing
security interest in the Collateral and shall (i) remain in full force and effect until the
termination of the obligations of Lenders to make Credit Extensions under the Loan Documents
and the payment in full of the Obligations (other than any contingent indemnity obligations
or, in the case of L/C Obligations, Cash Collateralization) and compliance with Section
10.01(e) of the Pipeline Credit Agreement with respect to outstanding Swap Contracts secured
by any Loan Document or in accordance with Section 10.21 of the Borrowing Base Facility
Credit Agreement; and (ii) inure to the benefit of and be enforceable by Secured Party,
Beneficiaries, and their respective successors, transferees, and permitted assigns. Without
limiting the generality of the foregoing clause (ii), Secured Party and Beneficiaries may
assign or otherwise transfer any of their respective Rights under this Security Agreement to
any other Person in accordance with the terms and provisions of Section 10.07 of the
Pipeline Credit Agreement, and to the extent of such assignment or transfer such Person
shall thereupon become vested with all the Rights and benefits in respect thereof granted
herein or otherwise to Secured Party or Beneficiaries, as the case may

 
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be. Upon payment in full of the Obligations (other than any contingent indemnity
obligations or, in the case of L/C Obligation, Cash Collateralization) and compliance with
Section 10.01(e) of the Credit Agreement with respect to outstanding Swap Contracts secured
by any Loan Document, Debtor shall be entitled to the return, upon its request and at its
expense, of such of the Collateral as shall not have been sold or otherwise applied pursuant
to the terms hereof.

     (b) Reference to Miscellaneous Provisions. This Security Agreement is one of
the “Loan Documents” referred to in the Pipeline Credit Agreement, and all provisions
relating to Loan Documents set forth in Article X of the Pipeline Credit Agreement are
incorporated herein by reference, the same as if set forth herein verbatim.

     (c) Term; Release of Liens. The Secured Party shall release the Liens created
by this Security Agreement in accordance with Section 10.01 and Section 10.21 of the
Borrowing Base Facility Credit Agreement; provided that no Obligor, if any, on any of the
Collateral shall ever be obligated to make inquiry as to the termination of this Security
Agreement, but shall be fully protected in making payment directly to Secured Party until
actual notice of such total payment of the Obligations is received by such Obligor. At such
time as the Liens created by this Security Agreement are to be released pursuant to this
paragraph, Secured Party shall, at the request and expense of the Debtor following such
termination, promptly deliver to the Debtor any Collateral held by the Secured Party
hereunder, and promptly execute and deliver to such Debtor such documents and instruments as
the Debtor shall reasonably request to evidence such termination and release as provided in
the Credit Agreement. In addition, if any of the Collateral shall be sold, transferred,
assigned or otherwise disposed of by the Debtor in a transaction permitted by the Pipeline
Credit Agreement, then the Secured Party, at the request and expense of the Debtor, shall
promptly execute and deliver releases as provided in the Pipeline Credit Agreement.

     (d) Actions Not Releases. The Security Interest and Debtor’s obligations and
Secured Party’s Rights hereunder shall not be released, diminished, impaired, or adversely
affected by the occurrence of any one or more of the following events: (i) the taking or
accepting of any other security or assurance for any or all of the Obligations; (ii) any
release, surrender, exchange, subordination, or loss of any security or assurance at any
time existing in connection with any or all of the Obligations; (iii) the modification of,
amendment to, or waiver of compliance with any terms of any of the other First Lien
Documents without the notification or consent of Debtor, except as required therein (the
Right to such notification or consent being herein specifically waived by Debtor); (iv) the
insolvency, bankruptcy, or lack of corporate or trust power of any party at any time liable
for the payment of any or all of the Obligations, whether now existing or hereafter
occurring; (v) any renewal, extension, or rearrangement of the payment of any or all of the
Obligations, either with or without notice to or consent of Debtor, or any adjustment,
indulgence, forbearance, or compromise that may be granted or given by Secured Party or any
Beneficiary to Debtor; (vi) any neglect, delay, omission, failure, or refusal of Secured
Party or any Beneficiary to take or prosecute any action in connection with any other
agreement, document, guaranty, or instrument evidencing, securing, or assuring the payment
of all or any of the Obligations; (vii) any failure of Secured Party or any Beneficiary to
notify Debtor of any renewal, extension, or assignment of the Obligations or any part
thereof, or the release of any Collateral or other security, or of any other action taken or
refrained from being taken by Secured Party or any Beneficiary against Debtor or any new
agreement between or among Secured Party or one or more Beneficiaries and Debtor, it being
understood that except as expressly provided herein, neither Secured Party nor any
Beneficiary shall be required to give Debtor any notice of

 
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any kind under any circumstances whatsoever with respect to or in connection with the
Obligations including, without limitation, notice of acceptance of this Security Agreement
or any Collateral ever delivered to or for the account of Secured Party hereunder
except to the extent expressly provided for herein or under the Pipeline Credit
Agreement; (viii) the illegality, invalidity, or unenforceability of all or any part of the
Obligations against any party obligated with respect thereto by reason of the fact that the
Obligations, or the interest paid or payable with respect thereto, exceeds the amount
permitted by Law, the act of creating the Obligations, or any part thereof, is ultra vires,
or the officers, partners, or trustees creating same acted in excess of their authority, or
for any other reason; or (ix) if any payment by any party obligated with respect thereto is
held to constitute a preference under applicable Laws or for any other reason Secured Party
or any Beneficiary is required to refund such payment or pay the amount thereof to someone
else.

     (e) Waivers. Except to the extent expressly otherwise provided herein or in
other First Lien Documents and to the fullest extent permitted by applicable Law, Debtor
waives (i) any Right to require Secured Party or any Beneficiary to proceed against any
other Person, to exhaust its Rights in Collateral, or to pursue any other Right which
Secured Party or any Beneficiary may have; (ii) with respect to the Obligations, presentment
and demand for payment, protest, notice of protest and nonpayment, and notice of the
intention to accelerate; and (iii) all Rights of marshaling in respect of any and all of the
Collateral.

     (f) Financing Statement; Authorization. Secured Party shall be entitled at any
time to file this Security Agreement or a carbon, photographic, or other reproduction of
this Security Agreement, as a financing statement, but the failure of Secured Party to do so
shall not impair the validity or enforceability of this Security Agreement. Debtor hereby
irrevocably authorizes Secured Party at any time and from time to time to file in any UCC
jurisdiction any initial or other financing statements and amendments thereto that (i)
indicate the Collateral (A) as “all assets of Debtor” or words of similar effect, regardless
of whether any particular asset comprised in the Collateral falls within the scope of
Article 9 of the UCC of the state or such jurisdiction or whether such assets are included
in the Collateral hereunder, or (B) as being of an equal or lesser scope or with greater
detail, and (ii) contain any other information required by Article 9 of the UCC of the state
or such jurisdiction for the sufficiency or filing office acceptance of any financing
statement or amendment, including (A) whether the Debtor is an organization, the type of
organization, and any organization identification number issued to Debtor and, (B) in the
case of a financing statement filed as a fixture filing or indicating Collateral that is
as-extracted collateral or timber to be cut, a sufficient description of real property to
which the Collateral relates. Debtor agrees to furnish any such information to Secured Party
promptly upon request.

     (g) Amendments. This Security Agreement may be amended only by an instrument in
writing executed jointly by Debtor and Secured Party, and supplemented only by documents
delivered or to be delivered in accordance with the express terms hereof.

     (h) Multiple Counterparts. This Security Agreement has been executed in a
number of identical counterparts, each of which shall be deemed an original for all purposes
and all of which constitute, collectively, one agreement; but, in making proof of this
Security Agreement, it shall not be necessary to produce or account for more than one such
counterpart.

 
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     (i) Parties Bound; Assignment. This Security Agreement shall be binding on
Debtor and Debtor’s legal representatives, successors, and assigns and shall inure to the
benefit of Secured Party and Secured Party’s successors and permitted assigns.

     (i) Secured Party is the agent for each Beneficiary under the Intercreditor
Agreement. The Security Interest and all Rights granted to Secured Party hereunder
or in connection herewith are for the ratable benefit of each Beneficiary, and
Secured Party may, without the joinder of any Beneficiary, exercise any and all
Rights in favor of Secured Party or any Beneficiary hereunder, including, without
limitation, conducting any foreclosure sales hereunder, and executing full or
partial releases hereof, amendments or modifications hereto, or consents or waivers
hereunder. The Rights of each Beneficiary vis-à-vis Secured Party and each other
Beneficiary may be subject to one or more separate agreements between or among such
parties, but Debtor need not inquire about any such agreement or be subject to any
terms thereof unless Debtor specifically joins therein; and consequently, neither
Debtor nor Debtor’s legal representatives, successors, and assigns shall be entitled
to any benefits or provisions of any such separate agreements or be entitled to rely
upon or raise as a defense, in any manner whatsoever, the failure or refusal of any
party thereto to comply with the provisions thereof.

     (ii) Except for this Security Agreement and assignments made in furtherance
hereof, Debtor may not, without the prior written consent of Secured Party, assign
any Rights, duties, or obligations hereunder.

     (j) Governing Law. The substantive laws of the State of New York, except to
the extent the laws of another jurisdiction govern the creation, perfection, validity, or
enforcement of liens under this Security Agreement, and the applicable federal laws of the
United States, shall govern the validity, construction, enforcement and interpretation of
this security agreement and all of the other loan documents.

     (k) The provisions of Section 10.10 of the Pipeline Credit Agreement are incorporated
herein as if set forth herein.

     (1) All notices given pursuant hereto shall be given in the manner set forth in the
Pipeline Credit Agreement, if to Secured Party, to the address of Secured Party therein set
forth and if to Debtor, to the following address:

210 Park Avenue, Suite 2750

Oklahoma City, Oklahoma 73102

Attn: General Counsel

Facsimile: (405) 840-9897

Telephone: (405) 488-1304

     THIS AGREEMENT 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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     IN WITNESS WHEREOF, the Debtor has caused this Security Agreement to be duly executed and
delivered by an officer duly authorized as of the date first above written.

	 	 	 	 	 	 	 	 	 

	 	 	POSTROCK KPC PIPELINE, LLC,	 	 
	 	 	a Delaware limited liability company	 	 
	 
	 	 	 	 	 	 	 	 
	 	 	By:	 	POSTROCK ENERGY SERVICES CORPORATION,	 	 
	 	 	 	 	its sole member	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	By:	 	/s/ David C. Lawler 	 	 
	 

	 	 	 	 	 	 

     David C. Lawler,
	 	 
	 

	 	 	 	 	 	     President and Chief Executive Officer	 	 

 
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ANNEX A TO SECURITY AGREEMENT

DEBTOR INFORMATION AND LOCATION OF COLLATERAL

	 	 	 	 	 	 	 	 	 

	A.	 	Exact Legal Name of Debtor:	 	POSTROCK KPC PIPELINE, LLC.
	 
	 	 	 	 	 	 	 	 
	B.	 	Mailing Address of Debtor:	 	210 Park Avenue, Suite 2750,

Oklahoma City, Oklahoma 73102
	 
	 	 	 	 	 	 	 	 
	C.	 	Type of Entity:	 	limited liability company.
	 
	 	 	 	 	 	 	 	 
	D.	 	Jurisdiction of Organization:	 	Delaware.
	 
	 	 	 	 	 	 	 	 
	E.

	 	State Issued Organizational

Identification Number:
	 	4871245.
	 
	 	 	 	 	 	 	 	 
	F.	 	Tax ID Number:	 	26-2860928.
	 
	 	 	 	 	 	 	 	 
	G.	 	Location of Books and Records:	 	210 Park Avenue, Suite 2750

Oklahoma City, Oklahoma 73102
	 
	 	 	 	 	 	 	 	 
	H.	 	Location of Collateral:	 	210 Park Avenue, Suite 2750

Oklahoma City, Oklahoma 73102

and See Item I. below
	 
	 	 	 	 	 	 	 	 
	I.

	 	Location of Real Property:	 	 	 	 	 	 
	 

	 	 	 	1.	Anderson County, KS
	 

	 	 	 	2.	Barber County, KS
	 

	 	 	 	3.	Butler County, KS
	 

	 	 	 	4.	
   Chase County, KS
	 

	 	 	 	5.	
   Coffey County, KS
	 

	 	 	 	6.	
   Comanche County, KS
	 

	 	 	 	7.	
   Cowley County, KS
	 

	 	 	 	8.	
   Elk County, KS
	 

	 	 	 	9.	
   Franklin County, KS
	 

	 	 	 	10.	
   Greenwood County, KS
	 

	 	 	 	11.	
   Harper County, KS
	 

	 	 	 	12.	
   Johnson County, KS
	 

	 	 	 	13.	
   Kingman County, KS
	 

	 	 	 	14.	
   Lyon County, KS
	 

	 	 	 	15.	
   Marion County, KS
	 

	 	 	 	16.	
   McPherson County, KS

 
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	 	 	 	 	17.	 	Miami County, KS
	 

	 	 	 	 	18.	 	Rice County, KS
	 

	 	 	 	 	19.	 	Sedgwick County, KS
	 

	 	 	 	 	20.	 	Wyandotte County, KS
	 

	 	 	 	 	21.	 	Harper County, OK
	 

	 	 	 	 	22.	 	Osage County, OK
	 

	 	 	 	 	23.	 	Pawnee County, OK
	 

	 	 	 	 	24.	 	Woods County, OK
	 

	 	 	 	 	25.	 	Cass County, MO
	 

	 	 	 	 	26.	 	Jackson County, MO
	 

	 	 	 	 	27.	 	Platte County, MO
	 
	 	 	 	 	 	 	 
	J.

	 	Jurisdiction(s) for Filing

Financing Statements:
	 	Delaware.
	 
	 
	 	 	 	 	 	 	 
	 

	 	Fixture filings in the
relevant counties
in which the properties
are located:
	 	None.
	 

 
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ANNEX B-1 TO SECURITY AGREEMENT

COLLATERAL DESCRIPTIONS

	A.	 	Collateral Notes and Collateral Note Security: None.
	 
	B.	 	Pledged Shares: None.
	 
	C.	 	Partnership/Limited Liability Company Interests: None.
	 
	D.	 	Partnership/Limited Liability Company Agreements: None.
	 
	E.	 	Commercial Tort Claims: None.
	 
	F.	 	Deposit Accounts (including name of bank address and account number):
	 
	 	 	Quest Pipelines (KPC) Operating, Comerica Bank, Dallas, TX, Acct #: 1881237422

 
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ANNEX B-2 TO SECURITY AGREEMENT

INTELLECTUAL PROPERTY

	1.	 	Registered Copyrights and Copyright Applications: None.
	 
	2.	 	Issued Patents and Patent Applications: None.
	 
	3.	 	Registered Trademarks and Trademark Applications: None.

  
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ANNEX C TO SECURITY AGREEMENT

DEPOSIT ACCOUNT CONTROL AGREEMENT

                    , 20__

____________________

____________________

____________________

Ladies and Gentlemen:

This letter is to notify you (the “Depository Bank”) that, pursuant to that certain Amended and
Restated Pledge and Security Agreement dated as of September 21, 2010 (as amended, modified,
supplemented, or restated from time to time, the “Security Agreement”), PostRock KPC Pipeline, LLC,
a company organized under the laws of Delaware (the “Pledgor”), has granted to Royal Bank of Canada
as Administrative Agent and Collateral Agent (“Pledgee”) a first priority security interest in and
lien upon, (a) Account No. __________ (the “Account”) maintained by Pledgor with you, (b) any
extensions or renewals of the Account if the Account is one which may be extended or renewed, and
(c) all of Pledgor’s right, title, and interest (whether now existing or hereafter created or
arising) in and to the Account, all sums from time to time on deposit therein, credited thereto, or
payable thereon, all instruments, documents, certificates, and other writings evidencing the
Account, and any and all proceeds of any thereof (the items described in clauses (a), (b) and (c)
being herein collectively called the “Collateral”),

In connection therewith, the parties hereto agree (which agreement by Pledgor will be construed as
instructions to the Depository Bank):

	1.	 	The Depository Bank is instructed to register the pledge on its books and hold the Collateral
in a pledged status account.
	 
	2.	 	The Depository Bank is instructed to deliver to Pledgee copies of monthly statements on the
account(s) identified below:
	 
	3.	 	The Account will be styled:
	 
	4.	 	All dividends, interest, gains, and other profits on the Collateral will be reported in the
name and tax identification number of Pledgor.
	 
	5.	 	If so notified by Pledgee, the Depository Bank will not, without the prior written consent of
Pledgee, allow any of the Collateral or any interest therein to be sold, transferred, or
withdrawn by or for the benefit of Pledgor.
	 
	6.	 	This letter agreement gives Pledgee “control” of the Account and the Collateral. The
Depository Bank agrees to comply with any order or instruction from Pledgee as to the
withdrawal or disposition of any funds from time to time credited to the Account, or as to any
other matters relating to the Collateral, without the further consent of Pledgor. The
Depository Bank shall be

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	 	 	fully entitled to rely upon such instructions from Pledgee even if such instructions are
contrary to any instructions or demands that Pledgor may give to the Depository Bank.
	 
	7.	 	Pledgee agrees to indemnify and hold the Depository Bank, its officers and employees,
harmless from and against any and all claims, causes of action, liabilities, lawsuits,
demands, and/or damages, including, without limitation any and all costs, including court
costs and reasonable attorneys’ fees, that may arise or result from the Depository Bank
complying with the instructions and orders of Pledgee given in connection with Pledgee’s
exercise of its control over and secured rights in the Account and the Collateral except to
the extent that such claims, causes of action, liabilities, lawsuits, demands, and/or damages
are found in a final, non-appealable judgment by a court of competent jurisdiction to have
resulted from the gross negligence or willful misconduct of the Depository Bank.
	 
	8.	 	Pledgor agrees to indemnify and hold the Depository Bank, its officers and employees,
harmless from and against any and all claims, causes of action, liabilities, lawsuits,
demands, and/or damages, including, without limitation, any and all costs, including court
costs and reasonable attorneys’ fees, that may arise or result from the Depository Bank
entering into and performing its obligations under this letter agreement except to the extent
that such claims, causes of action, liabilities, lawsuits, demands, and/or damages are found
in a final, non-appealable judgment by a court of competent jurisdiction to have resulted from
the gross negligence or willful misconduct of the Depository Bank.
	 
	9.	 	The Depository Bank represents that it has not received notice regarding any lien,
encumbrance, or other claim to the Account or the Collateral from any person other than
pursuant to this letter agreement and has not entered into another agreement with any other
party to act on such party’s instructions with respect to the Account. The Depository Bank
further agrees not to enter into any such agreement with any other party.
	 
	10.	 	The Depository Bank subordinates’ to the security interest of Pledgee any right of recoupment
or set-off, or to assert any security interest or other lien, that it may at any time have
against or in any of the Collateral on account of any credit or other obligations owed to the
Depository Bank by Pledgor or any other person. The Depository Bank may, however, from time to
time debit the Account for any of its customary charges in maintaining the Account or for
reimbursement for the reversal of any provisional credits granted by the Depository Bank to
the Account, to the extent, in each case, that Pledgor has not separately paid or reimbursed
Depository Bank therefor.
	 
	11.	 	To the extent a conflict exists between the terms of this letter agreement and any account
agreement between Pledgor and the Depository Bank, the terms of this letter agreement will
control.
	 
	12.	 	The terms of this letter agreement will in no way be modified except by a writing signed by
all parties hereto.
	 
	13.	 	This letter agreement will terminate upon notice of termination hereof delivered by Pledgee
to Depository Bank.

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	14.	 	Each of the parties executing this letter agreement represents that he has the proper
authority to execute this letter agreement.

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IN WITNESS WHEREOF, Pledgor and Pledgee have agreed to the terms of this letter agreement as
of the date first indicated above.

	 	 	 	 	 	 	 

	Pledgor:	 	 
	 
	 	 	 	 	 	 
	[NAME OF ENTITY]	 	 
	 
	 	 	 	 	 	 
	By:
	 	 
	 	 	 	 
	 

	 	Name:
	 

	 	 
	 

	 	Title:
	 	 

	 	 
	 

	 	 	 	 

	 	 
	Pledgee:	 	 
	 
	 	 	 	 	 	 
	ROYAL BANK OF CANADA,	 	 
	as Collateral Agent	 	 
	 
	 	 	 	 	 	 
	By:
	 	 	 	 	 	 
	 

	 	Name:
	 

	 	 
	 

	 	Title:
	 	 

	 	 
	 

	 	 	 	 

	 	 
	Acknowledged and Agreed on                     , 201_:
	 
	 	 	 	 	 	 
	Depository Bank:	 	 
	 
	 	 	 	 	 	 
	[NAME OF ENTITY]	 	 
	 
	 	 	 	 	 	 
	By:
	 	 	 	 	 	 
	 

	 	Name:
	 

	 	 
	 

	 	Title:
	 	 

	 	 
	 

	 	 	 	 

	 	 

 
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ANNEX D TO SECURITY AGREEMENT

ACKNOWLEDGMENT OF PLEDGE

PARTNERSHIP/LIMITED LIABILITY COMPANY: _____________________

INTEREST OWNER: _____________________________

     BY THIS ACKNOWLEDGMENT OF PLEDGE, dated as of ___________________, 201_,
___________________________ (the “Partnership/Limited Liability Company”) hereby acknowledges the
pledge in favor of Royal Bank of Canada, in its capacity as Collateral Agent for certain
beneficiaries and as Administrative Agent and Collateral Agent for certain Borrowing Base Facility
Lenders and as Secured Party (“Pledgee”) under that certain Amended and Restated Pledge and
Security Agreement dated as of September 21, 2010 (as amended, modified, supplemented, or restated
from time to time, the “Security Agreement”), against, and a security interest in favor of Pledgee
in, all of PostRock KPC Pipeline, LLC’s (the “Interest Owner”) Rights in connection with any
partnership interest in the Partnership/Limited Liability Company now and hereafter owned by the
Interest Owner (“Partnership/Limited Liability Company Interest”).

     A. Pledge Records. The Partnership/Limited Liability Company has identified Pledgee’s
interest in all of the Interest Owner’s Right, title, and interest in and to all of the Interest
Owner’s Partnership/Limited Liability Company Interest as subject to a pledge and security interest
in favor of Pledgee in the Partnership/Limited Liability Company records.

     B. Partnership/Limited Liability Company Distributions, Accounts, and Correspondence.
The Partnership/Limited Liability Company hereby acknowledges that (i) all proceeds, distributions,
and other amounts payable to the Interest Owner, including, without limitation, upon the
termination, liquidation, and dissolution of the Partnership/Limited Liability Company shall be
paid and remitted to the Pledgee upon demand, (ii) all funds in deposit accounts shall be held for
the benefit of Pledgee, and (iii) all future correspondence, accountings of distributions, and tax
returns of the Partnership/Limited Liability Company shall be provided to the Pledgee. The
Partnership/Limited Liability Company acknowledges and accepts such direction and hereby agrees
that it shall, upon the written demand by the Administrative Agent, pay directly to the
Administrative Agent at its offices at Royal Bank Plaza, P.O. Box 50, 200 Bay Street,
12th Floor, South Tower, Toronto, Ontario M5J 2W7 any and all distributions, income, and
cash flow arising from the Partnership/Limited Liability Company Interests whether payable in cash,
property or otherwise, subject to and in accordance with the terms and conditions of the
Partnership/Limited Liability Company Agreement. The Pledgee may from time to time notify the
Partnership/Limited Liability Company of any change of address to which such amounts are to be
paid.

Remainder of Page Intentionally Blank.

Signature Page to Follow.

 
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     EXECUTED as of the date first stated in this Acknowledgment of Pledge.

	 	 	 	 	 	 	 	 	 

	 

	 	By:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 

	 	Name:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 

	 	Title:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	 	 	[PARTNERSHIP/LIMITED LIABILITY COMPANY]	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	By:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 	 	 	 	as [General Partner] [Manager]	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	By:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 

	 	 	 	   Name:	 	 	 	 
	 

	 	 	 	   Title:	 	 

	 	 
	 

	 	 	 	 	 	 

	 	 

 
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Annex D - Page 2exv10w13

Exhibit 10.13

EXECUTION

PLEDGE AND SECURITY AGREEMENT

(PostRock Energy Services Corporation)

     THIS PLEDGE AND SECURITY AGREEMENT (herein referred to as this “Security
Agreement”) is executed as of September 21, 2010, by POSTROCK ENERGY SERVICES CORPORATION, a
Delaware corporation, formerly known as Quest Resource Corporation and successor by merger to Quest
Resource Acquisition Corp., PostRock Midstream, LLC (the successor by merger to Quest Midstream
Partners, L.P. and Quest Midstream GP, LLC), Quest Cherokee Oilfield Services, LLC, Quest
Mergersub, Inc., Quest Midstream Holdings Corp., Quest Energy Service, LLC and Energy & Midstream
Partners JV, LLC (“Debtor”), whose address is 210 Park Avenue, Suite 2750, Oklahoma City, Oklahoma
73102, in favor of ROYAL BANK OF CANADA as Collateral Agent (hereafter defined) for the benefit of
the Beneficiaries (hereafter defined) (the Collateral Agent, in such capacity, the “Secured Party”)
whose address is Royal Bank Plaza, P.O. Box 50, 200 Bay Street, 12th Floor, South Tower, Toronto,
Ontario M5J 2W7.

RECITALS

     A. Quest Midstream Partners, L.P., a Delaware master limited partnership (which merged into
and became Quest Acquisition Partners, LLC, which changed its name to PostRock Midstream, LLC,
which merged into PostRock Energy Services Corporation) and Bluestem Pipeline, LLC, as borrowers,
and Royal Bank of Canada as administrative and collateral agent, and the lenders party thereto,
entered into a Credit Agreement, dated as of January 31, 2007, providing for a $75,000,000 Senior
Credit Facility (as amended from time to time, the “Original Midstream Credit Agreement”).

     B. The Original Midstream Credit Agreement was amended and restated by an Amended and Restated
Credit Agreement dated as of November 1, 2007 among Quest Midstream Partners, L.P. and Bluestem
Pipeline, LLC, as borrowers, Royal Bank of Canada, as administrative and collateral agent, and the
lenders party thereto (the “Midstream Lenders”) providing for a $135,000,000 Senior Credit Facility
(as amended from time to time, the “First Amended and Restated Midstream Credit Agreement”).

     C. In connection with the First Amended and Restated Midstream Credit Agreement, Quest
Midstream Partners, L.P. financed its acquisition of (i) 100% of the limited liability company
membership interest in each of (a) Midcoast Kansas Pipeline, L.L.C., a Delaware limited liability
company (whose name after its acquisition was changed to Quest Kansas Pipeline, L.L.C.), and (b)
Midcoast Kansas General Partner, L.L.C., a Delaware limited liability company (whose name after its
acquisition was changed to Quest Kansas General Partner, L.L.C.), each of whom collectively owned
100% of the general partner interest in Enbridge Pipelines (KPC), a Kansas general partnership
(whose name after its acquisition was changed to Quest Pipelines (KPC)) which owned an approximate
1,120 mile interstate natural gas pipeline, gathering systems, processing facilities and related
assets located in the States of Kansas, Oklahoma and Missouri.

     D. The First Amended and Restated Midstream Credit Agreement was amended by a First Amendment
to Amended and Restated Credit Agreement, dated November 1, 2007, Second Amendment to Amended and
Restated Credit Agreement, dated October 28, 2008, and Third Amendment to Amended and Restated
Credit Agreement, dated December 17, 2009 (the First Amended and Restated Midstream Credit
Agreement as so amended the “Prior Midstream Credit Agreement”).

     E. The Prior Midstream Credit Agreement is being amended and restated in its entirety pursuant
to that certain Second Amended and Restated Credit Agreement of even date herewith (the

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“Pipeline Credit Agreement”), among Debtor and PostRock KPC Pipeline, LLC, a Delaware limited
liability company (“KPC Pipeline LLC”; collectively KPC Pipeline LLC and Debtor, the “Pipeline
Facility Borrowers”), each lender from time to time party thereto (collectively, the “Pipeline
Facility Lenders”), and Royal Bank of Canada, as administrative agent and collateral agent.
Pursuant to the Pipeline Credit Agreement, the Pipeline Facility Lenders have agreed to make a
$15,000,000 term loan to the Pipeline Facility Borrowers.

     F. Pursuant to that certain Second Amended and Restated Credit Agreement dated of even date
herewith (the “Borrowing Base Facility Credit Agreement”; the Pipeline Credit Agreement, together
with the Borrowing Base Facility Credit Agreement collectively, the “Credit Agreements” and
individually a “Credit Agreement”), among Debtor and MidContinent (hereinafter
defined)(collectively Debtor and MidContinent, the “Borrowing Base Facility Borrowers”), each
lender from time to time party thereto (collectively, the “Borrowing Base Facility Lenders”), and
Royal Bank of Canada, as administrative agent and collateral agent, the Borrowing Base Facility
Lenders have agreed to make loans and issue letters of credit to or for the Borrowing Base Facility
Borrowers.

     G. Pursuant to an Intercreditor and Collateral Agency Agreement dated of even date herewith
(the “Intercreditor Agreement”) among Royal Bank of Canada, as First Lien Agent (hereafter defined)
for the First Lien Secured Parties (hereafter defined), the First Lien Secured Parties, Royal Bank
of Canada, as Second Lien Agent (hereafter defined) for the Second Lien Secured Parties (hereafter
defined), the Second Lien Secured Parties and each of the Debtor and MidContinent, Royal Bank of
Canada, as collateral agent for the First Lien Secured Parties and Second Lien Secured Parties, and
KPC Pipeline LLC, the Collateral Agent agreed to act as collateral agent for the First Lien Secured
Parties and Second Lien Secured Parties for purposes of dealing with the Collateral, including for
purposes of this Security Agreement, apportioning payments among First Lien Secured Parties and the
Second Lien Secured Parties with respect to proceeds thereof.

     H. The Debtor has agreed to enter into this Security Agreement, and (i) in connection with the
Pipeline Credit Agreement, Debtor desires to secure all indebtedness owing under the Pipeline
Credit Agreement with a first priority lien on the Collateral, and (ii) in connection with the
Borrowing Base Facility Credit Agreement, Debtor desires to secure all indebtedness owing under the
Borrowing Base Facility Credit Agreement with a lien on the Collateral which is junior, subject and
subordinated to the lien on the Collateral securing indebtedness owing under the Pipeline Credit
Agreement.

     I. Debtor has duly authorized the execution, delivery and performance of this Security
Agreement.

     J. This Security Agreement is integral to the transactions contemplated by the Intercreditor
Agreement and Credit Agreements, and the execution and delivery of this Security Agreement is
required under the terms of the Credit Agreements.

     ACCORDINGLY, for valuable consideration, the receipt and adequacy of which are hereby
acknowledged, Debtor and Secured Party hereby agree as follows:

ARTICLE I

Definitions and References

     Section 1.1. References to Pipeline Credit Agreement. The terms, conditions, and provisions of the Pipeline Credit Agreement are incorporated
herein by reference, the same as if set forth herein verbatim, which terms, conditions, and
provisions shall continue to be in full force and effect hereunder so long as the Pipeline Facility
Lenders are obligated to lend under the Pipeline Credit Agreement and

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thereafter until the Obligations (hereafter defined) are paid and performed in full (except as
provided in Sections 10.01(d) and 10.01(e) of the Pipeline Credit Agreement).

     Section 1.2. Certain Definitions. Unless otherwise defined herein, or the context
hereof otherwise requires, each term defined in the Pipeline Credit Agreement or in the UCC is used
in this Security Agreement with the same meaning; provided that, if the definition given to such
term in the Pipeline Credit Agreement conflicts with the definition given to such term in the UCC,
the definition in the Pipeline Credit Agreement shall control to the extent legally allowable; and
if any definition given to such term in Chapter 9 of the UCC conflicts with the definition given to
such term in any other chapter of the UCC, the Chapter 9 definition shall prevail. As used herein,
the following terms have the meanings indicated:

     Section 1.3. Certain Definitions. Definitions in this Security Agreement

The following terms have the following meanings unless otherwise indicated:

     Beneficiaries means collectively all of the Intercreditor Secured Parties and Beneficiary
means any one of the Beneficiaries.

     Borrowing Base Facility Borrowers has the meaning set forth in Recital F hereto.

     Borrowing Base Facility Credit Agreement has the meaning set forth in Recital F hereto.

     Borrowing Base Facility Lenders has the meaning set forth in Recital F hereto.

     Collateral means, with respect to Debtor, all property described in Section 2.1 in which
Debtor has any right, title or interest.

     Collateral Agent means Royal Bank of Canada in its capacity as “Collateral Agent” for the
Intercreditor Secured Parties pursuant to the Intercreditor Agreement.

     Credit Agreement and Credit Agreements have the meanings specified in Recital F.

     Debtor has the meaning specified in the preamble.

     First Amended and Restated Midstream Credit Agreement has the meaning set forth in Recital B
hereto.

     First Lien Agent has the meaning set forth in the Intercreditor Agreement.

	 	 	First Lien Document has the meaning set forth in the Intercreditor Agreement.

	 	 	First Lien Notes has the meaning set forth in the definition of “Obligations”.

	 	 	First Lien Obligations has the meaning set forth in the Intercreditor Agreement.

	 	 	First Lien Secured Parties has the meaning set forth in the Intercreditor Agreement.

	 	 	Intercreditor Agreement has the meaning set forth in Recital G hereto.

     Intercreditor Secured Parties means the “Secured Parties” as defined in the Intercreditor
Agreement.

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     Issuer has the meaning specified in Section 2.1.

     KPC Pipeline LLC has the meaning set forth in Recital E hereto.

     MidContinent means PostRock MidContinent Production, LLC, a Delaware limited liability
company.

     Midstream Lenders has the meaning set forth in Recital B hereto.

     Notes has the meaning set forth in the definition of “Obligations”.

     Obligations means, collectively

     (a) all indebtedness, liabilities, and obligations of Debtor arising under this Security
Agreement,

     (b) all First Lien Obligations including without limitation, all indebtedness, obligations and
liabilities, whether now in existence or hereafter arising, whether by acceleration or otherwise,
of a Pipeline Facility Borrower arising out of or under the Pipeline Credit Agreement and each
other First Lien Document to which a Pipeline Facility Borrower is a party, and all indebtedness,
obligations and liabilities, whether now in existence or hereafter arising, whether by acceleration
or otherwise, and evidenced by those certain promissory notes in the aggregate principal amount of
Fifteen Million and 00/100 United States Dollars (US $15,000,000.00) executed jointly and severally
by the Pipeline Facility Borrowers and payable to the order of the Pipeline Facility Lenders on or
before February 28, 2012 and all other notes given in substitution for the foregoing promissory
notes, or in modification, renewal, rearrangement or extension thereof, in whole or in part (such
promissory notes, as from time to time supplemented, amended or modified and all other notes given
in substitution therefor or in modification, renewal, rearrangement or extension thereof, in whole
or in part, being hereafter collectively called the “First Lien Notes”), and with interest,
collection and attorneys’ fees, all as provided therein,

     (c) all Second Lien Obligations including including without limitation, (i) all indebtedness,
obligations and liabilities, whether now in existence or hereafter arising, whether by acceleration
or otherwise, of Midcontinent and Debtor arising out of or under the Borrowing Base Facility Credit
Agreement and each other Second Lien Document, and all indebtedness, obligations and liabilities,
whether now in existence or hereafter arising, whether by acceleration or otherwise, and evidenced
by those certain promissory notes in the initial aggregate principal amount of Two Hundred
Twenty-Five Million and 00/100 United States Dollars (US $225,000,000.00) executed jointly and
severally by Midcontinent and Debtor and payable to the order of the Borrowing Base Facility
Lenders on or before June 30, 2013 and all other notes given in substitution for the foregoing
promissory notes, or in modification, renewal, rearrangement or extension thereof, in whole or in
part (such promissory notes, as from time to time supplemented, amended or modified and all other
notes given in substitution therefor or in modification, renewal, rearrangement or extension
thereof, in whole or in part, being hereafter collectively called the “Second Lien Notes;”
the First Lien Notes and the Second Lien Notes collectively called the “Notes”), and with interest,
collection and attorneys’ fees, all as provided therein and (ii) all indebtedness, obligations and
liabilities, whether now in existence or hereafter arising, whether by acceleration or otherwise,
in respect to letters of credit issued pursuant to the Borrowing Base Facility Credit Agreement and
all reimbursement obligations in respect thereof. It being understood and agreed that the liens
and security interests granted in this Security Agreement to secure the indebtedness described in
(c) above is junior, subject and subordinated to the liens and security interests granted in this
Security Agreement to secure the indebtedness described in (b) above and this Security Agreement is
a Security Document (as defined in the Intercreditor Agreement) and is subject to the agreements
set forth in the Intercreditor Agreement,

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     (d) all additional loans or advances made by the Beneficiaries to or for the benefit of the
Pipeline Facility Borrowers or Borrowing Base Facility Borrowers pursuant to the Pipeline Credit
Agreement, Borrowing Base Facility Credit Agreement or any other First Lien Document or Second Lien
Document,

     (e) payment of and performance of any and all present or future obligations of any Pipeline
Facility Borrower or any Borrowing Base Facility Borrower according to the terms of any Lender
Hedging Agreement,

     (f) any sums which may be advanced or paid by Secured Party or any Beneficiary under the terms
hereof on account of the failure of Debtor to comply with the covenants of Debtor contained herein,
or the failure of Debtor to comply with the covenants of Debtor contained in the Pipeline Credit
Agreement, Borrowing Base Facility Credit Agreement or any other First Lien Document or Second Lien
Document; and all other indebtedness of Debtor arising pursuant to the provisions of this Security
Agreement, including penalties, indemnities, legal and other fees, charges and expenses, and
amounts advanced by and expenses incurred in order to preserve any collateral or security interest,
whether due after acceleration or otherwise; and

     (g) all interest (including, without limitation, interest accruing at any post-default rate
and interest accruing after the filing of any petition in bankruptcy, or the commencement of any
insolvency, reorganization or like proceeding, whether or not a claim for post-filing or
post-petition interest is allowed in such proceeding) in respect of all of the indebtedness
described herein and all costs of collection and attorneys’ fees, all as provided herein and in the
Pipeline Credit Agreement and Borrowing Base Facility Credit Agreement.

     Original Midstream Credit Agreement has the meaning set forth in Recital A hereto.

     Pipeline Credit Agreement has the meaning set forth in Recital E hereto.

     Pipeline Facility Borrowers and Pipeline Facility Borrower have the meanings set forth in
Recital E hereto.

     Pipeline Facility Lenders and Pipeline Facility Lender have the meanings set forth in Recital
E hereto.

     Pledged Equity has the meaning specified in Section 2.1.

     Prior Midstream Credit Agreement has the meaning set forth in Recital D hereto.

     Second Lien Agent has the meaning set forth in the Intercreditor Agreement.

     Second Lien Document has the meaning set forth in the Intercreditor Agreement.

     Second Lien Notes has the meaning set forth in the definition of “Obligations”.

     Second Lien Obligations has the meaning set forth in the Intercreditor Agreement.

     Second Lien Secured Parties has the meaning set forth in the Intercreditor Agreement.

     Secured Party has the meaning specified in the preamble.

     Securities Act means the Securities Act of 1933.

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     Security Agreement has the meaning specified in the preamble.

     UCC means the Uniform Commercial Code in effect in the State of New York from time to time;
provided that, if perfection or the effect of perfection or non-perfection or the priority of any
security interest in any Collateral is governed by the Uniform Commercial Code as in effect in a
jurisdiction other than the State of New York, “UCC” means the Uniform Commercial Code as in effect
from time to time in such other jurisdiction for purposes of the provisions hereof relating to such
perfection, effect of perfection or non-perfection or priority.

ARTICLE II

Security Interest

     Section 2.1. Grant of Security Interest. As collateral security for the payment and performance of all Obligations,
Debtor pledges, collaterally assigns and grants to Secured Party a continuing security interest in
all right, title and interest of Debtor in and to Debtor’s 100% limited liability company interest
in KPC Pipeline, LLC (in its capacity as issuer of the Pledged Equity (hereafter defined), the
“Issuer”), whether such equity interest is now owned or existing or hereafter acquired or arising,
whether such equity is a General Intangible or a security, and all equity that Debtor may acquire
in the future that is issued by Issuer and all proceeds of the foregoing (collectively, the
“Pledged Equity”).

     Section 2.2. Obligations Secured.

     (a) The security interest created hereby in the Collateral secures the payment and
performance of all Obligations.

     (b) Without limiting the generality of the foregoing, this Security Agreement
secures, as to Debtor, the payment of all amounts that constitute part of the Obligations and would
be owed by the Pipeline Facility Borrowers and Borrowing Base Facility Borrowers to any Beneficiary
but for the fact that they are unenforceable or not allowable due to the existence of a bankruptcy,
reorganization or similar proceeding involving any such Borrower.

ARTICLE III

Representations and Warranties

     Section 3.1. Representations and Warranties. Debtor represents and warrants to Secured Party as follows:

     (a) Debtor has and will have at all times the right, power and authority to grant to
Secured Party as provided herein a security interest in the Collateral, free and clear of any Lien,
except for Permitted Liens. This Security Agreement creates a valid and binding security interest
in favor of Secured Party in the Collateral, securing the Obligations.

     (b) With respect to Pledged Equity:

     (i) All units constituting Pledged Equity have been duly authorized and validly issued,
and, as applicable, are fully paid and non-assessable, and were not issued in violation of
the preemptive rights of any Person or of any agreement by which Debtor or the Issuer is
bound.

     (ii) All documentary, stamp or other taxes or fees owing in connection with the
issuance, transfer or pledge of any Pledged Equity (or rights in respect thereof) have been
paid.

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     (iii) Other than as set forth herein, in the Pipeline Credit Agreement, or under
applicable federal or state securities Laws, no restriction or condition exists with respect
to the transfer, voting or capital of any Pledged Equity.

     (iv) Issuer has no outstanding subscription agreement, option, warrant or convertible
security outstanding or any other right outstanding pursuant to which any Person would be
entitled to have issued to it units of ownership interest in Issuer.

     (v) Debtor has taken or concurrently herewith is taking all actions necessary to
perfect Secured Party’s security interest in Pledged Equity, including making any
registration, filing or notice that may be necessary or advisable under Articles 8 or 9 of
the Uniform Commercial Code as in effect in the jurisdiction in which the Issuer of such
Pledged Equity was organized, and no other Person has any such registration, filing or
notice in effect with respect to the Pledged Equity.

     (vi) Debtor has delivered a correct and complete copy of the Issuer’s limited liability
company agreement to Secured Party.

     (vii) Neither the execution, delivery or performance of this Security Agreement nor the
exercise of any right or remedy of Secured Party hereunder will cause a default under any
agreement in respect of Pledged Equity to which Debtor or Issuer is a party or otherwise
adversely affect or diminish any Pledged Equity.

     (viii) Debtor’s rights under any agreement in respect of Pledged Equity are enforceable
in accordance with their terms, except as such enforcement may be limited by bankruptcy,
insolvency or similar laws of general application relating to the enforcement of creditors’
rights.

     (ix) Debtor has delivered to Secured Party to the extent such Pledged Equity is
uncertificated, an executed Acknowledgment of Pledge in the form of Annex A with respect to
such Pledged Equity.

     (c) The Pledged Equity constitutes all equity interests in the Issuer owned by
Debtor as of the date hereof. Debtor has delivered to Secured Party all certificates evidencing
such Pledged Equity, duly indorsed, or accompanied by unit powers duly indorsed, in blank for
transfer.

     (d) Debtor is a corporation and is organized under the laws of the State of
Delaware, which is Debtor’s location pursuant to the UCC. Debtor does not presently conduct
business under any name except the name in which it has executed this Security Agreement, which is
the exact name that appears in Debtor’s organizational documents. Debtor’s only other names during
the five year period prior to the date of this Security Agreement are the names listed in the
preamble.

     (e) Debtor has good and marketable title to the Collateral, free and clear of all
Liens, except (i) for the security interest created by this Security Agreement, and (ii) Permitted
Liens. No effective financing statement or other registration or instrument similar in effect
covering any Collateral is on file in any recording office except any that have been filed in favor
of Secured Party relating to this Security Agreement.

     (f) Neither the ownership or intended use of the Collateral by Debtor, nor the grant
of the security interest by Debtor to Secured Party hereunder:

     (i) conflicts with:

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     (A) any applicable domestic or foreign Law,

     (B) any organizational document of Debtor or the Issuer; or

     (C) any agreement, judgment, license, order or permit applicable to or binding
upon Debtor or the Issuer, or

     (ii) results in or requires the creation of any Lien, charge or encumbrance upon any
asset of Debtor except for the security interest granted by Debtor to Secured Party
hereunder.

     (g) There is no condition precedent to the effectiveness of this Security Agreement
that has not been satisfied or waived.

ARTICLE IV

Covenants

     Section 4.1. General Covenants. Debtor will, so long as this Security Agreement shall be in effect, perform and observe the
following:

     (a) Without limitation of any other covenant herein, Debtor shall not cause or
permit any change in its name, identity or organizational structure, or any change to its
jurisdiction of organization, unless Debtor shall have first:

     (i) notified Secured Party of such change at least 30 days prior to the effective date
of such change (or such shorter notice as Secured Party may approve),

     (ii) taken all action requested by Secured Party (under the following subsection (b) or
otherwise) for the purpose of further confirming and protecting Secured Party’s security
interest and rights under this Security Agreement and the perfection and priority thereof,
and

     (iii) if reasonably requested by Secured Party, provided to Secured Party a legal
opinion to Secured Party’s satisfaction confirming that such change shall not adversely
affect Secured Party’s security interest and rights under this Security Agreement or the
perfection or priority of such security interest.

In any notice delivered pursuant to this subsection, Debtor will expressly state that the notice is
required by this Security Agreement and contains facts that may require additional filings of
financing statements or other notices for the purposes of continuing perfection of Secured Party’s
security interest in the Collateral.

     (b) Debtor will, at its expense and as from time to time reasonably requested by
Secured Party, promptly execute and deliver all further instruments, agreements, filings and
registrations, and take all further action, in order:

     (i) to confirm and validate this Security Agreement and Secured Party’s rights and
remedies hereunder,

     (ii) to correct any error or omission in the description herein of the Obligations or
the Collateral or in any other provision hereof,

     (iii) to perfect, register and protect the security interest and rights created or
purported to be created hereby or to maintain the required priority of such security
interests and rights,

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     (iv) to enable Secured Party to exercise and enforce its rights and remedies hereunder,
or

     (v) otherwise to give Secured Party the full benefits of the rights and remedies
described in or granted under this Security Agreement.

As part of the foregoing, Debtor will, whenever requested by Secured Party:

     (A) execute (as applicable) and file any financing statement, continuation
statement or other filing or registration relating to Secured Party’s security
interest and rights hereunder, and any amendment thereto, and

     (B) mark its books and records relating to any Collateral to reflect that such
Collateral is subject to this Security Agreement and the security interests
hereunder.

     (c) Debtor will:

     (i) Maintain good and marketable title to all Collateral, free and clear of all Liens
and not grant or allow any such Lien to exist except for the security interest created by
this Security Agreement, and (ii) Permitted Liens.

     (ii) Not allow to remain in effect, and cause to be terminated, any financing statement
or other registration or instrument similar in effect covering any Collateral, except (i)
any that has been filed in favor of Secured Party relating to this Security Agreement, and
(ii) Permitted Liens.

     (iii) Defend Secured Party’s right, title and security interest in and to the
Collateral against the claims of any Person.

     (d) Debtor shall not take any action that would, or fail to take any action if such
failure would, impair the enforceability, perfection or priority of Secured Party’s security
interest in any Collateral.

     Section 4.2. Covenants Relating Specifically to the Nature of the Collateral. Debtor will, for so long as the Obligations relating to the First Lien Documents are
outstanding, perform and observe the following:

     (a) If Debtor shall at any time hold or acquire any certificated security evidencing
Collateral, Debtor will forthwith endorse, assign, and deliver the same to Secured Party,
accompanied by such instruments of transfer or assignment duly executed in blank as Secured Party
may from time to time specify.

     (i) If any security evidencing Collateral now or hereafter acquired by Debtor is
uncertificated and is issued to Debtor or its nominee directly by the issuer thereof, Debtor
shall immediately notify Secured Party of such issuance and, pursuant to an agreement in
form and substance satisfactory to Secured Party, cause the issuer thereof to agree to
comply with instructions from Secured Party as to such security, without further consent of
Debtor or such nominee, or take such other action as Secured Party may approve in order to
perfect Secured Party’s security interest in such security.

     (ii) If any security, whether certificated or uncertificated, or other Investment
Property now or hereafter acquired by Debtor and evidencing Collateral, is held by Debtor or
its nominee through a securities intermediary, Debtor shall immediately notify Secured Party

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thereof, and, at Secured Party’s request and option, pursuant to an agreement in form
and substance satisfactory to Secured Party, either:

     (A) cause such securities intermediary to agree to comply with entitlement
orders or other instructions from Secured Party to such securities intermediary as
to such securities or other Investment Property, in each case without further
consent of Debtor or such nominee, or

     (B) in the case of financial assets or other Investment Property held through a
securities intermediary, arrange for Secured Party to become the entitlement holder
with respect to such Investment Property, with Debtor being permitted to exercise
rights to withdraw or otherwise deal with such Investment Property.

Subsections (A) and (B) above shall not apply to any financial asset credited to a
Securities Account for which Secured Party is the securities intermediary or commodity
intermediary.

     (iii) Debtor shall not permit any Pledged Equity that is an equity interest in a
limited liability company or a limited partnership and that is a General Intangible to
become Investment Property unless it shall have given Secured Party at least 30-days’ prior
notice (or such shorter notice as Secured Party may approve) and shall have taken such steps
as Secured Party shall request in connection with the perfection or priority of Secured
Party’s security interest therein as provided in subsections (i) and (ii) above.

     (iv) Debtor shall not:

     (A) adjust, settle, compromise, amend or modify any right in respect of any
Pledged Equity or any agreement relating thereto except for any adjustment,
settlement, modification, compromise or amendment that would not materially
adversely affect Secured Party’s rights hereunder;

     (B) permit the creation of any additional equity interest in the Issuer, unless
immediately upon creation the same is pledged to Secured Party pursuant hereto to
the extent necessary to give Secured Party a first-priority security interest in
such Pledged Equity after such creation that is in the aggregate at least the same
percentage of such Pledged Equity as was subject hereto before such issue, whether
such additional interest is presently vested or will vest upon the payment of money
or the occurrence or non-occurrence of any other condition; or

     (C) enter into any agreement, other than the First Lien Documents and Second
Lien Documents, creating, or otherwise permit to exist, any restriction or condition
upon the transfer or exercise of any rights in respect of any Pledged Equity,
including any restriction or condition upon the transfer, voting or control of any
Pledged Equity.

ARTICLE V

Voting and Distribution Rights in Respect Of Pledged Equity

     Section 5.1. Voting Rights. Debtor shall be entitled to exercise all voting and other consensual rights pertaining to the
Pledged Equity or any part thereof for any purpose; provided that Debtor shall not exercise or
refrain from exercising any such right if such action would have a material adverse effect on the
value of any Pledged Equity or on Secured Party’s security interest or the value thereof; and
provided further that, upon the occurrence and during the continuance of an Event of Default,

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upon notice from Secured Party to Debtor, all rights to exercise or refrain from exercising the
voting and other consensual rights that Debtor would otherwise be entitled to exercise shall cease
and all such rights shall thereupon become vested in Secured Party, which thereupon shall have the
sole right to exercise or refrain from exercising such voting and other consensual rights.

     Section 5.2. Dividend Rights While No Event of Default Exists. Debtor shall be entitled to receive and retain all dividends, interest and other distributions
paid in respect of the Pledged Equity until the occurrence and continuance of an Event of Default.

     Section 5.3. Actions by Secured Party. Secured Party will execute and deliver (or cause to be executed and delivered) to Debtor all
such proxies and other instruments as Debtor may reasonably request for the purpose of enabling
Debtor to exercise the voting and other rights that it is entitled to exercise pursuant to Section
5.1 above and to receive the dividends or interest payments that it is authorized to receive and
retain pursuant to Section 5.2 above.

     Section 5.4. Rights While an Event of Default Exists. Upon the occurrence and during the continuance of an Event of Default:

     (a) All rights of Debtor to receive the dividends, interest and other distributions
that it would otherwise be authorized to receive and retain pursuant to Section 5.2 shall
automatically cease, and all such rights shall thereupon become vested in Secured Party, which
shall thereupon have the sole right to exercise or refrain from exercising such voting and other
consensual rights and to receive and hold as Pledged Equity such dividends, interest and other
distributions.

     (b) All dividends, interest and other distributions that are received by Debtor
contrary to subsection (a) above shall be received in trust for the benefit of Secured Party, shall
be segregated from other funds of Debtor and shall be forthwith paid over to Secured Party as
Pledged Equity in the same form as so received (with any necessary indorsement).

ARTICLE VI

Remedies, Powers and Authorizations

     Section 6.1. Normal Provisions Concerning the Collateral.

     (a) Debtor irrevocably authorizes Secured Party at any time and from time to time to
file, without the signature of Debtor, in any jurisdiction any amendments to existing financing
statements and any initial financing statements and amendments thereto that:

     (i) indicate the nature of the Collateral;

     (ii) contain any other information required for the sufficiency or filing office
acceptance of any financing statement or amendment, including whether Debtor is an
organization, the type of organization and any organization identification number issued to
Debtor; and

     (iii) properly effectuate the transactions described in the First Lien Documents, as
determined by Secured Party in its discretion.

Debtor will furnish any information described in items (i) — (iii) above to Secured Party promptly
upon request. A carbon, photographic or other reproduction of this Security Agreement or any
financing statement describing any Collateral is sufficient as a financing statement and may be
filed in any

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jurisdiction by Secured Party. Debtor ratifies and approves all financing statements heretofore
filed by or on behalf of Secured Party in any jurisdiction in connection with the transactions
contemplated hereby.

     (b) Effective upon and during the continuance of an Event of Default, Debtor
appoints Secured Party as Debtor’s attorney in fact and proxy, with full authority in the place and
stead of Debtor and in the name of Debtor or otherwise, from time to time in Secured Party’s
discretion, to take any action and to execute any instrument that Secured Party may deem necessary
or advisable to accomplish the purposes of this Security Agreement including any action or
instrument:

     (i) to ask for, demand, collect, sue for, recover, compound, receive and give
acquittance and receipts for moneys due and to become due under or in respect of any
Collateral;

     (ii) to receive, indorse and collect any drafts or other Instruments or Documents with
respect to any Collateral;

     (iii) to enforce any obligations included in the Collateral; and

     (iv) to file any claims or take any action or institute any proceedings that Secured
Party may deem necessary or desirable for the collection of any Collateral or otherwise to
enforce the rights of Debtor or Secured Party with respect to any Collateral.

Such power of attorney and proxy are coupled with an interest, are irrevocable, and are to be used
by Secured Party for the sole benefit of the Beneficiaries.

     (c) If Debtor fails to perform any agreement or obligation contained herein, Secured
Party may, but shall have no obligation to, itself perform, or cause performance of, such agreement
or obligation, and the expenses of Secured Party incurred in connection therewith shall be payable
by Debtor under Section 6.6.

     (d) Secured Party shall have the right upon and during the continuance of an Event
of Default, at any time in its discretion and without notice to Debtor, to transfer to or to
register in the name of Secured Party or any of its nominees any Pledged Equity, subject only to
the revocable rights specified in Section 5.1. Debtor shall forthwith, upon and during the
continuance of an Event of Default, cause all Pledged Equity in which it has an interest on the
date hereof to be registered in the name of Secured Party or such of Secured Party’s nominees as
Secured Party shall direct, and, upon Debtor’s acquisition of any interest in any Pledged Equity in
the future, forthwith cause the same to be so registered.

     (e) Anything herein to the contrary notwithstanding prior to such time as Secured
Party succeeds to Debtor’s rights as owner of he Collateral, whether pursuant to foreclosure or
otherwise:

     (i) Debtor shall remain liable to perform all duties and obligations under the
agreements included in the Collateral to the same extent as if this Security Agreement had
not been executed.

     (ii) The exercise by Secured Party of any right hereunder shall not release Debtor from
any duty or obligation under any agreement included in the Collateral.

     (iii) Secured Party shall not have any obligation or liability under the agreements in
respect of the Collateral by reason of this Security Agreement or any other First Lien
Document, nor shall Secured Party be obligated to perform any duty or obligation of Debtor
thereunder or take any action to collect or enforce any claim for payment assigned
hereunder.

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     Section 6.2. Event of Default Remedies. If an Event of Default shall have occurred and be continuing, Secured Party may from time to
time in its discretion (but subject to the terms and conditions of the Intercreditor Agreement and
Pipeline Credit Agreement), without limitation and without notice except as expressly provided
below:

     (a) Exercise in respect of the Collateral, in addition to any other right and remedy
provided for herein, under the other First Lien Documents, or otherwise available to it, all the
rights and remedies of a secured party on default under the UCC (whether or not the UCC applies to
the affected Collateral) and any other applicable Law.

     (b) Require Debtor to, and Debtor will at its expense and upon request of Secured
Party forthwith, assemble all or part of the Collateral as directed by Secured Party and make it
(together with all books, records and information of Debtor relating thereto) available to Secured
Party at a place to be designated by Secured Party that is reasonably convenient to both parties.

     (c) Prior to the disposition of any Collateral:

     (i) to the extent permitted by applicable Law, enter, with or without process of law
and without breach of the peace, any premises where any Collateral is or may be located, and
without charge or liability to Secured Party seize and remove such Collateral from such
premises, and

     (ii) have access to and use the Company’s books, records, and information relating to
the Collateral.

     (d) Reduce its claim to judgment or foreclose or otherwise enforce, in whole or in
part, the security interest created hereby by any available judicial procedure.

     (e) Dispose of, at its office, on the premises of Debtor or elsewhere, any
Collateral, as a unit or in parcels, by public or private proceedings, and by way of one or more
contracts (but the sale of any Collateral shall not exhaust Secured Party’s power of sale, and
sales may be made from time to time, and at any time, until all of the Collateral has been sold or
until the Obligations have been paid and performed in full), and at any such sale it shall not be
necessary to exhibit any Collateral.

     (f) Buy (or allow Secured Party to buy) Collateral, or any part thereof, at any
public sale.

     (g) Buy (or allow Secured Party to buy) Collateral, or any part thereof, at any
private sale if any Collateral is of a type customarily sold in a recognized market or is of a type
that is the subject of widely distributed standard price quotations.

     (h) Apply by appropriate judicial proceedings for appointment of a receiver for the
Collateral, or any part thereof, and Debtor consents to any such appointment.

     (i) Comply with any applicable state or federal Law requirement in connection with a
disposition of Collateral and such compliance shall not be considered to affect adversely the
commercial reasonableness of any sale of Collateral.

     (j) Sell Collateral without giving any warranty, with respect to title or any other
matter.

     (k) To the extent notice of sale shall be required by law with respect to
Collateral, at least ten (10) Business Days’ notice to Debtor of the time and place of any public
sale or the time after which any private sale is to be made shall constitute reasonable
notification; provided that, if Secured Party fails in

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any respect to give such notice, its liability for such failure shall be limited to the
liability (if any) imposed on it by law under the UCC. Secured Party shall not be obligated to
make any sale of Collateral regardless of notice of sale having been given. Secured Party may
adjourn any public or private sale from time to time by announcement at the time and place fixed
therefor, and such sale may, without further notice, be made at the time and place to which it was
so adjourned.

     Section 6.3. Application of Proceeds. If an Event of Default shall have occurred and be continuing, any cash held by or on behalf of
Secured Party and all cash proceeds received by or on behalf of Secured Party in respect of any
sale of, collection from, or other realization upon any Collateral may, in the discretion of
Secured Party, be held by Secured Party as collateral for, and/or then or at any time thereafter
applied in whole or in part by Secured Party against, the Obligations, in the following manner:

     (a) First, subject to the terms of the Intercreditor Agreement and Pipeline
Credit Agreement, to Secured Party for any amounts then owing to Secured Party for costs or
expenses incurred by Secured Party in connection therewith.

     (b) Second, subject to the terms of the Intercreditor Agreement and Pipeline
Credit Agreement paid to Secured Party, as agent for the Beneficiaries, in repayment of the
Obligations.

     (c) Third, any surplus of such cash or cash proceeds held by or on the
behalf of Secured Party and remaining after payment in full of all the Obligations shall be paid
over to the Debtor or to whatever Person may be lawfully entitled to receive such surplus.

     Section 6.4. Deficiency. If the proceeds of any sale, collection or realization of or
upon the Collateral of Debtor by Secured Party are insufficient to pay all Obligations and all
other amounts to which Secured Party is entitled, Debtor shall be liable for the deficiency,
together with interest thereon as provided in the First Lien Documents or (if no interest is so
provided) at such other rate as shall be fixed by applicable law, together with the costs of
collection and the reasonable fees of any attorneys employed by Secured Party to collect such
deficiency. Subject to the provisions hereof and applicable Law, Collateral may be sold at a loss
to Debtor, and Secured Party shall have no liability or responsibility to Debtor for such loss.
Debtor acknowledges that a private sale may result in less proceeds than a public sale.

     Section 6.5. Private Sales of Pledged Equity. Secured Party may deem it impracticable to effect a public sale of any Pledged Equity and may
determine to make one or more private sales of such Pledged Equity to a restricted group of
purchasers that will be obligated to agree, among other things, to acquire the same for their own
account, for investment and not with a view to the distribution or resale thereof. Any such
private sale may be at a price and on other terms less favorable to the seller than the price and
other terms that might have been obtained at a public sale. Any such private sale nevertheless
shall be deemed to have been made in a commercially reasonable manner, and Secured Party shall not
have any obligation to delay sale of any such Pledged Equity for the period of time necessary to
permit its registration for public sale under the Securities Act. Any offer to sell any such
Collateral that has been:

     (i) publicly advertised on a bona-fide basis in a newspaper or other publication of
general circulation in the financial communities of New York, New York, Houston, Texas and
Oklahoma City, Oklahoma (to the extent that such an offer may be so advertised without prior
registration under the Securities Act), or

     (ii) made privately in the manner described above to not less than 15 bona-fide
offerees,

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shall be deemed to involve a “public disposition” under Chapter 9.610(c) of the UCC,
notwithstanding that such sale may not constitute a “public offering” under the Securities Act, and
Secured Party may credit bid for such Collateral, i.e., bid in all or a portion of the Obligations.

     Section 6.6. Non-Judicial Remedies. In granting to Secured Party the power to enforce its rights hereunder without prior judicial
process or judicial hearing, to the extent permitted by applicable Law, Debtor waives, renounces
and knowingly relinquishes any legal right that might otherwise require Secured Party to enforce
its rights by judicial process and confirms that such remedies are consistent with the usage of
trade, are responsive to commercial necessity and are the result of a bargain at arm’s length.
Secured Party may, however, in its discretion, resort to judicial process.

     Section 6.7. Limitation on Duty of Secured Party in Respect of Collateral. Beyond the exercise of reasonable care in the custody thereof, Secured Party shall have no duty
as to any Collateral in its possession or control or in the possession or control of any agent or
bailee or as to the preservation of rights against prior parties or any other rights pertaining
thereto. Secured Party shall be deemed to have exercised reasonable care in the custody of
Collateral in its possession if such Collateral is accorded treatment substantially equal to that
which it accords its own property, and Secured Party shall not be liable or responsible for any
loss or damage to any Collateral, or for any diminution in the value thereof, by reason of the act
or omission of any warehouseman, carrier, forwarding agency, consignee or other agent or bailee
selected by Secured Party in good faith.

ARTICLE VII

Miscellaneous

     Section 7.1. Notices. Any notice or communication required or permitted hereunder shall be given in writing or by
electronic transmission, sent in the manner provided in the Pipeline Credit Agreement, if to
Secured Party, to the address set forth in the Intercreditor Agreement and for Debtor, to the
address specified in the preamble to this Security Agreement, or to such other address or to the
attention of such other individual as hereafter shall be designated in writing by the applicable
party sent in accordance herewith. Any such notice or communication shall be deemed to have been
given as provided in the Pipeline Credit Agreement for notices given thereunder.

     Section 7.2. Amendments and Waivers. Except as provided in Section 7.3, no amendment of this Security Agreement shall be effective
unless it is in writing and signed by Debtor and Secured Party, and no waiver of this Security
Agreement or consent to any departure by Debtor herefrom shall be effective unless it is in writing
and signed by Secured Party, and then such waiver or consent shall be effective only in the
specific instance and for the specific purpose for that given and to the extent specified in such
writing. In addition, all such amendments and waivers shall be effective only if given with the
necessary approvals required in the Pipeline Credit Agreement.

     Section 7.3. Preservation of Rights. No failure on the part of Secured Party to exercise, and no delay in exercising, any right
hereunder or under any other First Lien Document shall operate as a waiver thereof; nor shall any
single or partial exercise of any such right preclude any other or further exercise thereof or the
exercise of any other right. The rights and remedies of Secured Party provided herein and in the
other First Lien Documents are cumulative and are in addition to, and not exclusive of, any rights
or remedies provided by Law or otherwise.

     Section 7.4. Severability. Any provision of this Security Agreement that is prohibited or unenforceable in any jurisdiction
shall, as to such jurisdiction, be ineffective to the extent of such prohibition or invalidity
without invalidating the remaining portions hereof or thereof or affecting the validity or
enforceability of such provision in any other jurisdiction.

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     Section 7.5. Survival. Each representation and warranty, covenant and other obligation of Debtor herein shall survive
the execution and delivery of this Security Agreement, the execution and delivery of any other
First Lien Document and the creation of the Obligations.

     Section 7.6. Parties Bound, Assignment. This Security Agreement shall be binding on Debtor and Debtor’s legal representatives,
successors, and assigns and shall inure to the benefit of Secured Party and Secured Party’s
successors and permitted assigns.

     (i) Secured Party is the agent for each Beneficiary under the Intercreditor
Agreement. The Security Interest and all Rights granted to Secured Party hereunder
or in connection herewith are for the ratable benefit of each Beneficiary, and
Secured Party may, without the joinder of any Beneficiary, exercise any and all
Rights in favor of Secured Party or any Beneficiary hereunder, including, without
limitation, conducting any foreclosure sales hereunder, and executing full or
partial releases hereof, amendments or modifications hereto, or consents or waivers
hereunder. The Rights of each Beneficiary vis-à-vis Secured Party and each other
Beneficiary may be subject to one or more separate agreements between or among such
parties, but Debtor need not inquire about any such agreement or be subject to any
terms thereof unless Debtor specifically joins therein; and consequently, neither
Debtor nor Debtor’s legal representatives, successors, and assigns shall be entitled
to any benefits or provisions of any such separate agreements or be entitled to rely
upon or raise as a defense, in any manner whatsoever, the failure or refusal of any
party thereto to comply with the provisions thereof.

     (ii) Except for this Security Agreement and assignments made in furtherance
hereof, Debtor may not, without the prior written consent of Secured Party, assign
any Rights, duties, or obligations hereunder.

     Section 7.7. Release of Collateral; Termination.

     (a) Upon any sale, lease, transfer or other disposition of any Collateral of Debtor
in accordance with the First Lien Documents, Secured Party will, at Debtor’s expense, execute and
deliver to Debtor such documents as Debtor shall reasonably request to evidence the release of such
Collateral from the assignment and security interest granted hereby; provided that:

     (i) at the time of such request and such release no Default shall have occurred and be
continuing,

     (ii) Debtor shall have delivered to Secured Party, at least 10 Business Days prior to
the date of the proposed release (or by such lesser notice as Secured Party may approve), a
written request for release describing the item of Collateral and the terms of the sale,
lease, transfer or other disposition in reasonable detail, including the price thereof and
any expenses in connection therewith, together with a form of release for execution by
Secured Party and a certificate of Debtor to the effect that the transaction is in
compliance with the First Lien Documents and such other matters as Secured Party may
request, and

     (iii) if any First Lien Document provides for any application of the proceeds of any
such sale, lease, transfer or other disposition, or any payment to be made, in connection
therewith, such proceeds shall have been applied or payment made as provided therein.

     (b) Upon, and only upon, the indefeasible payment and satisfaction in full in cash
of the Obligations that relate to the First Lien Credit Agreement and in accordance with Section
10.21 of the

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Second Lien Document, this Security Agreement and the security interest created hereby shall
terminate, all rights in the Collateral shall revert to Debtor and Secured Party, at a Debtor’s
request and at its expense, will:

     (i) return to Debtor such of Debtor’s Collateral in Secured Party’s possession as shall
not have been sold or otherwise disposed of or applied pursuant to the terms hereof, and

     (ii) execute and deliver to Debtor such documents as Debtor shall reasonably request to
evidence such termination.

     (c) Debtor is not authorized to file any financing statement or amendment or
termination statement with respect to any financing statement originally filed in connection with
this Security Agreement without the prior written consent of Secured Party, subject to Debtors’
rights under Chapters 9.509(d)(2) and 9.518 of the UCC.

     Section 7.8. Governing Law. This Security Agreement shall be governed by and construed in accordance with the laws of the
State of New York.

     Section 7.9. Final Agreement. This Security Agreement and the other First Lien Documents represent the final agreement between
the parties hereto and may not be contradicted by evidence of prior, contemporaneous, or subsequent
oral agreements of the parties hereto. There are no unwritten oral agreements between the parties
hereto.

     Section 7.10. Counterparts; Facsimile. This Security Agreement may be executed in any number of counterparts (and by different parties
hereto in different counterparts), each of which when so executed shall be deemed to be an original
and all of which when taken together shall constitute one and the same agreement. Delivery of an
executed counterpart of a signature page of this Security Agreement by telecopy, facsimile,
photocopy or by sending a scanned copy by electronic mail shall be effective as delivery of a
manually executed counterpart of this Security Agreement.

     Section 7.11. Acceptance by Secured Party. By its acceptance of the benefits hereof, Secured Party shall be deemed to have agreed to be
bound hereby and to perform any obligation on its part set forth herein.

Remainder of this page intentionally left blank.

Signature page follows.

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     IN WITNESS WHEREOF, Debtor has executed and delivered this Security Agreement as of the date
first-above written.

	 	 	 	 	 	 	 

	DEBTOR:	 	POSTROCK ENERGY SERVICES CORPORATION,	 	 
	 	 	a Delaware corporation	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	/s/ David C. Lawler	 	 
	 

	 	 	 	 

David C. Lawler
	 	 
	 

	 	 	 	President and Chief Executive Officer	 	 

Signature Page

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ANNEX A TO PLEDGE AND SECURITY AGREEMENT

ACKNOWLEDGMENT OF PLEDGE

LIMITED LIABILITY COMPANY: POSTROCK KPC PIPELINE, LLC

INTEREST OWNER: POSTROCK ENERGY SERVICES CORPORATION

     BY THIS ACKNOWLEDGMENT OF PLEDGE, dated as of September 21, 2010, POSTROCK KPC PIPELINE, LLC
(the “Limited Liability Company”) hereby acknowledges the pledge in favor of Royal Bank of Canada
(“Pledgee”), in its capacity as Collateral Agent for certain beneficiaries under that certain
Pledge and Security Agreement dated as of September 21, 2010 (as amended, modified, supplemented,
or restated from time to time, the “Security Agreement”), against, and a security interest in favor
of Pledgee in, all of POSTROCK ENERGY SERVICES CORPORATION’s (the “Interest Owner”) Rights in
connection with any membership interest in the Limited Liability Company now and hereafter owned by
the Interest Owner (“Limited Liability Company Interest”).

     A. Pledge Records. The Limited Liability Company has identified Pledgee’s interest in
all of the Interest Owner’s Right, title, and interest in and to all of the Interest Owner’s
Limited Liability Company Interest as subject to a pledge and security interest in favor of Pledgee
in the Limited Liability Company records.

     B. Limited Liability Company Distributions, Accounts, and Correspondence. The Limited
Liability Company hereby acknowledges that (i) all proceeds, distributions, and other amounts
payable to the Interest Owner, including, without limitation, upon the termination, liquidation,
and dissolution of the Limited Liability Company shall be paid and remitted to the Pledgee upon
demand, (ii) all funds in deposit accounts shall be held for the benefit of Pledgee, and (iii) all
future correspondence, accountings of distributions, and tax returns of the Limited Liability
Company shall be provided to the Pledgee. The Limited Liability Company acknowledges and accepts
such direction and hereby agrees that it shall, upon the written demand by the Administrative
Agent, pay directly to the Administrative Agent at its offices at Royal Bank Plaza, P.O. Box 50,
200 Bay Street, 12th Floor, South Tower, Toronto, Ontario M5J 2W7 any and all
distributions, income, and cash flow arising from the Limited Liability Company Interests whether
payable in cash, property or otherwise, subject to and in accordance with the terms and conditions
of the Limited Liability Company Agreement. The Pledgee may from time to time notify the Limited
Liability Company of any change of address to which such amounts are to be paid.

Remainder of Page Intentionally Blank.

Signature Page to Follow.

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     EXECUTED as of the date first stated in this Acknowledgment of Pledge.

	 	 	 	 	 	 	 	 	 

	 	 	POSTROCK KPC PIPELINE, LLC,	 	 
	 	 	a Delaware limited liability company	 	 
	 
	 	 	 	 	 	 	 	 
	 	 	By:	 	POSTROCK ENERGY SERVICES CORPORATION,	 	 
	 	 	 	 	its sole member	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	By:	 	 	 	 
	 

	 	 	 	 	 	 

David C. Lawler
	 	 
	 

	 	 	 	 	 	President and Chief Executive Officer	 	 

PESC KPC Pipeline Equity Pledge

Annex A
Page 2

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