Document:

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SUBORDINATED PROMISSORY NOTE

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY
APPLICABLE STATE SECURITIES LAWS, AND MAY NOT BE OFFERED OR SOLD UNLESS IT HAS BEEN REGISTERED
UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR UNLESS AN EXEMPTION FROM REGISTRATION IS
AVAILABLE AND THEN ONLY IN COMPLIANCE WITH THE RESTRICTIONS ON TRANSFER SET FORTH HEREIN.

THIS INSTRUMENT AND THE RIGHTS AND OBLIGATIONS EVIDENCED HEREBY ARE SUBORDINATE IN THE MANNER AND
TO THE EXTENT SET FORTH HEREIN TO THE SENIOR DEBT (AS HEREINAFTER DEFINED); AND EACH HOLDER OF THIS
INSTRUMENT, BY ITS ACCEPTANCE HEREOF, IRREVOCABLY AGREES TO BE BOUND BY THE SUBORDINATION
PROVISIONS HEREIN.

			
	$50,000,000	 	August 10, 2007

     FOR VALUE RECEIVED, QUICKSILVER GAS SERVICES LP, a Delaware limited partnership
(“Payor”), HEREBY AGREES TO PAY to the order of QUICKSILVER RESOURCES INC., a Delaware
corporation, or its successors and assigns (together with its successors and assigns, the
“Subordinated Creditor”), in lawful currency of the United States of America, in
immediately available funds, at such location or bank account as the Subordinated Creditor shall
from time to time designate, the principal amount of Fifty Million and 00/100 Dollars
($50,000,000), together with interest, compounded quarterly, on the unpaid principal balance
outstanding from time to time from the date hereof until the Maturity Date (as hereinafter defined)
at a rate of interest per annum equal to the lesser of (a) the Note Rate (as hereinafter defined)
or (b) the Highest Lawful Rate (as hereinafter defined); provided, however, that,
notwithstanding the foregoing, in the event the Payor fails to make any payment of any portion of
the principal of this Note when due and payable (including, without limitation, due to a Blockage
Event), at the request of the Subordinated Creditor, interest on such overdue amount (including,
without limitation, interest with respect to such overdue amount to the extent permitted by
applicable law) shall accrue at a rate of interest per annum equal to the lesser of (a) the Note
Rate plus two percent (2.00%) and (b) the Highest Lawful Rate. Capitalized terms used in this
Subordinated Promissory Note (this “Note”), but not defined herein shall have the meanings
specified therefor in the Credit Agreement, dated as of August 10, 2007 (as amended, restated,
supplemented or otherwise modified from time to time, the “Credit Agreement”), among Payor,
as the borrower, the Lenders party thereto, Bank of America, N.A., as L/C Issuer thereunder, Bank
of America, N.A., as Administrative Agent (or any successor administrative agent appointed pursuant
to Article IX of the Credit Agreement, the “Administrative Agent”) for the Lenders
thereunder, and the other Agents party thereto.

     1. Principal. Subject to the subordination provisions contained in Section 7
hereof, Payor promises to pay the principal on this Note in equal consecutive quarterly
installments of $275,000 on the last Business Day of each calendar quarter, beginning on March 31,
2008, and to pay the entire remaining outstanding principal balance on this Note on February 10,
2013 (the

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“Maturity Date”); provided, that, if the final maturity date of the
Senior Debt (as hereinafter defined) is extended to any date later than August 10, 2012 (such later
date being referred to herein as the “Extended Senior Maturity Date”), the Maturity Date
shall be automatically extended without further action by Payor or the Subordinated Creditor to the
date that is six months after such Extended Senior Maturity Date, and the amount of the quarterly
installments of principal will be reamortized to create equal quarterly installments of the
remaining outstanding principal balance on this Note over the remaining term of this Note as
extended. Notwithstanding anything to the contrary herein, any amounts paid or prepaid hereunder
may not be reborrowed thereafter. Furthermore, notwithstanding anything to the contrary herein,
all amounts payable pursuant to this Note (including, without limitation, all principal and
interest payments, and prepayments thereof) may, at the request of the Subordinated Creditor, be
paid, in whole or in part, using Equity Interests of Payor.

     2. Interest. Subject to the subordination provisions contained in Section 7
hereof, Payor also promises to pay interest on the unpaid principal amount from time to time
outstanding hereunder from the date hereof until such principal amount is paid in full at the
applicable rate per annum set forth above, which interest shall be payable quarterly on the last
Business Day of each calendar quarter, beginning March 31, 2008, and on the Maturity Date, (a) by
capitalizing the accrued and unpaid interest on this Note and adding it to the then unpaid
principal amount hereof, or (b) at the request of the Subordinated Creditor, by wire transfer of
immediately available funds, in lawful currency of the United States of America, to a bank account
designated by the Subordinated Creditor to Payor on or prior to the applicable due date therefor.
Interest on this Note will be calculated based on a 360-day year and paid for the actual number of
days elapsed.

     As used herein, the term “Note Rate” shall mean a rate of interest per annum equal to
the Adjusted Eurodollar Rate for an Interest Period of three (3) months, plus the Applicable Rate
for Eurodollar Loans for such day as determined pursuant to the terms of the Credit Agreement,
regardless of whether such interest rate is in effect for any Borrowings outstanding under the
Credit Agreement, plus one percent (1.00%). The Note Rate shall change effective upon each change
in the Applicable Rate under the Credit Agreement and shall remain in effect until the next change
in the Applicable Rate effected pursuant to the Credit Agreement. Each determination by the
Subordinated Creditor of the Note Rate shall, except in cases of manifest error, be final,
conclusive and binding. If the Subordinated Creditor determines (which determination shall be
conclusive absent manifest error) that adequate and reasonable means do not exist for ascertaining
the Adjusted Eurodollar Rate or the Eurodollar Rate, as applicable, pursuant to the terms of the
Credit Agreement, for the Interest Period specified above, then, at the option of the Subordinated
Creditor, and in the Subordinated Creditor’s sole discretion, the Note Rate shall be determined by
the Subordinated Creditor by reference to (a) the Adjusted Eurodollar Rate for such other Interest
Period as the Subordinated Creditor may select in its sole discretion, or (b) the interest rate
applicable to ABR Loans as provided in the Credit Agreement, in each case, plus the Applicable Rate
for such Type of Loan

     3. Prepayments. Subject to the subordination provisions contained in Section 7 hereof, this Note may be prepaid in full or in part at any time and from time to time
without premium or penalty. The prepayment of any principal amount of this Note shall be made
together with all accrued and unpaid interest thereon through the date of prepayment and all

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accrued and unpaid costs and expenses then payable hereunder. In the event of a partial
prepayment, the Subordinated Creditor shall record the date and amount of any such prepayments on
the reverse side of this Note, and interest shall cease to accrue on such prepaid principal
amounts.

     4. Note Events of Default.

          (a) The occurrence of any of the following events constitutes an event of default under this
Note (each, a “Note Event of Default”):

	 	 	 	          (i) Payor defaults in the payment of any portion of the principal of, interest on, or
other amounts owing under, this Note when due and payable, except to the extent a failure to
pay is due to a Blockage Event; or
	 
	 		 	          (ii) Payor or any other Person (other than the Subordinated Creditor) fails to perform
or observe any other term, covenant or agreement contained in this Note, and such default
shall continue unremedied for a period of thirty (30) days after the earlier to occur of (A)
the date upon which a Responsible Officer of the General Partner becomes aware of such
default and (B) the date upon which written notice thereof is given to Payor by the
Subordinated Creditor; or
	 
	 	 	 	          (iii) an Event of Default (as defined in the Credit Agreement) shall occur; or
	 
	 	 	 	          (iv) any representation or warranty at any time made by Payor or any other Person in
this Note shall be, or shall prove to have been, false or misleading in any material respect
when so made; or
	 
	 	 	 	          (v) this Note shall cease, for any reason, to be in full force and effect; any
provision of this Note shall for any reason cease to be valid and binding on or enforceable
against Payor; the validity or enforceability of this Note is contested by Payor or any
other Person; or Payor denies it has any further liability or obligation under this Note.

          (b) Subject to the subordination provisions contained in Section 7 hereof, upon the
occurrence and during the continuance of any Note Event of Default, the Subordinated Creditor shall
have the right, without notice, demand, presentment, notice of nonpayment or nonperformance,
protest, notice of protest, notice of intent to accelerate, notice of acceleration or any other
notice or action of any kind, ALL OF WHICH PAYOR HEREBY EXPRESSLY WAIVES AND RELINQUISHES, (i) by
notice to Payor, to declare the entire principal amount then outstanding on this Note, and all
accrued and unpaid interest thereon and all other accrued and unpaid amounts hereunder, immediately
due and payable, whereupon all such principal, interest and other amounts shall become immediately
due and payable, and the Subordinated Creditor may proceed to enforce the payment of such
principal, interest and other amounts, or part thereof, in such manner as the Subordinated Creditor
may elect and (ii) to exercise all rights and remedies available to it under this Note or at law or
in equity;

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provided, however, subject to the terms hereof, upon the occurrence of any Event of Default defined
in clause (h) or (i) of Article VIII of the Credit Agreement (in the case of clause (h) of Article
VIII of the Credit Agreement, upon the expiration of the sixty (60) day period mentioned therein),
the unpaid principal amount of this Note, and all accrued and unpaid interest thereon and all other
accrued and unpaid amounts hereunder, shall automatically become due and payable without further
act of the Subordinated Creditor.

     5. Ranking. All obligations evidenced hereby shall (a) be subordinated pursuant to
the subordination provisions contained in Section 7 hereof to the prior payment in full of
the Senior Debt, (b) rank pari passu with all unsubordinated indebtedness of Payor (other than the
Senior Debt), and (c) rank senior to any subordinated indebtedness of Payor.

     6. Amendment and Restatement. Upon the payment in full of the Senior Debt, Payor
hereby agrees, if requested by the Subordinated Creditor, to execute and deliver to the
Subordinated Creditor a new note that will amend and restate this Note, which amended and restated
note shall, among other things, include those provisions of the Credit Agreement (including,
without limitation, the applicable provisions for determining the interest rate under the Credit
Agreement, the covenants contained in Articles VI and VII of the Credit Agreement, the Events of
Default (as defined in the Credit Agreement) contained in Article VIII of the Credit Agreement and
the applicable defined terms contained in the Credit Agreement that are used in such interest rate
provisions, covenants and Events of Default) as the Subordinated Creditor in its sole discretion
shall determine appropriate to include in such amended and restated note, the provisions of the
Credit Agreement so included in such amended and restated note to include (a) such modifications
thereto, in the Subordinated Creditor’s sole discretion, necessary to conform such provisions (for
example, definitions) for use in the context of such amended and restated note, and (b) any other
changes thereto (including, but not limited to, changing the methodology for determining the Note
Rate) requested by the Subordinated Creditor and consented to by Payor, such consent not to be
unreasonably withheld, conditioned or delayed.

     7. Subordination Provisions. (a) The aggregate principal amount owing to the
Subordinated Creditor from time to time under this Note, all accrued and unpaid interest thereon
(if any), and any and all other Indebtedness evidenced by or otherwise owing in respect of this
Note, whether now or hereafter existing, including, without limitation, all such Indebtedness
under, or in respect of, any and all extensions, modifications, substitutions, amendments,
amendments and restatements, renewals, refinancings and refundings of any or all of the foregoing
Indebtedness, and any instrument or agreement evidencing, governing or otherwise setting forth the
terms of any such Indebtedness or other Indebtedness incurred in any such extension, modification,
substitution, amendment, amendment and restatement, renewal, refinancing or refunding, in each case
whether direct or indirect, absolute or contingent, and whether for principal, interest (including,
without limitation, interest accruing after the filing of a petition initiating any Insolvency
Proceeding (as hereinafter defined), whether or not such interest accrues after the filing of such
petition for purposes of any applicable Insolvency Laws (as hereinafter defined), or is an allowed
claim in such Insolvency Proceeding), premiums, fees, indemnification obligations, contract causes
of action, costs, expenses or otherwise (all such Indebtedness being, collectively, the
“Subordinated Debt”) is and shall be subordinate and junior in right of payment, to the
extent and in the manner hereinafter set forth, to the prior payment in full of all Indebtedness,
whether now or hereafter existing, including, without

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limitation, all Lender Indebtedness, under or in respect of: (i) the Credit Agreement, the
Notes, the Security Instruments, the other Loan Documents and the Hedging Agreements entered into
by Payor or any of its Subsidiaries with any Lender or Secured Affiliate (the “Secured Hedging
Agreements”) and (ii) any and all extensions, modifications, substitutions, amendments,
amendments and restatements, renewals and refundings of any or all of the foregoing Indebtedness,
and any instrument or agreement evidencing, governing or otherwise setting forth the terms of any
such Indebtedness or other Indebtedness incurred in any such extension, modification, substitution,
amendment, amendment and restatement, renewal or refunding, in each case whether direct or
indirect, absolute or contingent, and whether for principal, interest (including, without
limitation, interest accruing after the filing of a petition initiating any Insolvency Proceeding,
whether or not such interest accrues after the filing of such petition for purposes of any
applicable Insolvency Laws, or is an allowed claim in such Insolvency Proceeding), premiums, fees,
indemnification obligations (exclusive of indemnification obligations not then owing which survive
the termination or expiration of the Credit Agreement or the other Loan Documents, to the extent
demand therefor has not been made or threatened as of the date of such termination or expiration),
contract causes of action, costs and expenses pursuant to the Loan Documents (all such Indebtedness
being, collectively, the “Senior Debt”). For all purposes of this Note, the Senior Debt
shall not be deemed to have been paid in full (“paid in full” or “payment in full”)
until (A) such Senior Debt (exclusive of indemnification obligations not then owing which survive
the termination or expiration of the Credit Agreement or the other Loan Documents, to the extent
demand therefor has not been made or threatened as of the date of such termination or expiration,
and Cash Collateralized L/C Obligations) has been indefeasibly paid in full in cash, (B) the
termination of all of the Commitments, and (C) there are no Letters of Credit (exclusive of Letters
of Credit which have been Cash Collateralized) issued under the Loan Documents.

          (b) Until all of the Senior Debt shall have been paid in full, subject to the proviso to this
sentence and the last sentence of this Section 7(b), no payment or distribution of any
property or assets of Payor of any kind or character (including, without limitation, any payment
that may be payable in respect of, or turnover of funds to be applied to, the Subordinated Debt by
reason of any other Indebtedness or obligations of Payor being subordinated to payment of the
Subordinated Debt) shall be made by or on behalf of Payor for or on account of any Subordinated
Debt or any purchase, redemption or other acquisition thereof (including, without limitation, by
way of set-off, counterclaim or otherwise), and the Subordinated Creditor shall not ask, demand,
sue for, take or receive from Payor, directly or indirectly, in cash or other property or by
set-off or in any other manner (including, without limitation, from or by way of collateral),
payment of all or any of the Subordinated Debt; provided, however, that
notwithstanding the foregoing or anything to the contrary contained herein or in the Loan
Documents, if no Blockage Event then exists or would result therefrom, Payor (i) may and shall make
any and all regularly scheduled payments in respect of the Subordinated Debt, including any missed
payments (and default interest thereon at the then applicable rate provided herein) that it was
prohibited from making to the Subordinated Creditor during the existence of any Blockage Event, to
the Subordinated Creditor with no further notice, consent or action by the Administrative Agent,
the Lenders or the Secured Affiliates, and (ii) may make, at any time and from time to time in
whole or in part, any prepayments of this Note to the Subordinated Creditor with no further notice,
consent or action by the Administrative Agent, the Lenders or the Secured Affiliates. Payor and
the Subordinated Creditor (by its acceptance

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hereof) acknowledge and agree that, as of the date of this Note, a Blockage Event of the type
described in clause (C) of the definition thereof exists. As used herein, the term “Blockage
Event” shall mean (A) an Event of Default exists on the date of any payment on this Note, (B) a
judicial proceeding is pending with respect to any Event of Default on the date of any payment on
this Note, or (C) the Consolidated Leverage Ratio as of the end of the Fiscal Quarter immediately
preceding the date of any principal payment on this Note is equal to or greater than 3.5 to 1.0 and
would be equal to or greater than 3.5 to 1.0 after giving pro forma effect to any such principal
payment (in each case as calculated pursuant to the following sentence). Notwithstanding anything
to the contrary contained in the Credit Agreement, including in the definitions of Consolidated
Leverage Ratio, Consolidated Funded Debt or Funded Indebtedness, the Consolidated Leverage Ratio
for purposes of this Section 7(b) only shall be calculated to include any Indebtedness
remaining on this Note after giving pro forma effect to any such permitted payment hereunder.
Notwithstanding the foregoing or anything to the contrary contained herein, (1) nothing in this
Note shall prevent the occurrence of any Note Event of Default, the acceleration by the
Subordinated Creditor of any of the indebtedness hereunder after the acceleration of the Senior
Debt or the giving of any notice by the Subordinated Creditor to Payor with respect thereto, (2)
Payor may at all times pay interest hereunder by capitalization of the accrued and unpaid interest
as described in Section 2 of this Note, and (3) at the request of the Subordinated
Creditor, Payor may at all times make payments or prepayments, in whole or in part, with respect to
this Note using Equity Interests of Payor and/or using the proceeds from the contemporaneous sale
or issuance of Equity Interests of Payor.

          (c) In the event of any dissolution, winding up, liquidation, arrangement, reorganization,
adjustment, protection, relief or composition of Payor or its debts, whether voluntary or
involuntary, in any bankruptcy, insolvency, arrangement, reorganization, receivership, relief or
other similar action or proceeding under the United States Federal Bankruptcy Code or any other
federal or state bankruptcy or insolvency laws or any similar Governmental Rule of any other
jurisdiction covering the protection of creditors’ rights or the relief of debtors (collectively,
the “Insolvency Laws”) or upon an assignment for the benefit of creditors or any other
marshalling of the property, assets and liabilities of Payor or otherwise (each, an “Insolvency
Proceeding”), the Administrative Agent, for the ratable benefit of the L/C Issuer, Lenders and
Secured Affiliates (collectively, the “Secured Parties”), shall be entitled to receive
payment in full of all of the Senior Debt (whether or not any or all of the Senior Debt has been
declared due and payable prior to the date on which such Senior Debt otherwise would have become
due and payable) before the Subordinated Creditor (or anyone claiming through or on its behalf
(including, without limitation, any receiver, trustee or other similar Person) is entitled to
receive or retain any payment or distribution of any kind or character on account of all or any of
the Subordinated Debt, and, to that end, any payment or distribution of any kind or character
(whether in cash, property or securities) that otherwise would be payable or deliverable upon or
with respect to the Subordinated Debt in any such Insolvency Proceeding (including, without
limitation, any payment that may be payable in respect of, or turnover of funds to be applied to,
the Subordinated Debt by reason of any other Indebtedness or obligations of Payor being
subordinated to payment of the Subordinated Debt) shall be paid or delivered forthwith directly to
the Administrative Agent, for the account of the Secured Parties, in the same form as so received
(with any necessary endorsement or assignment) for application (in the case of cash) to, or to be
held as collateral (in the case of noncash property or securities) for, the payment,

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prepayment and/or cash collateralization of the Senior Debt until all of the Senior Debt shall
have been paid in full.

          (d) So long as the Senior Debt shall not have been paid in full, the Subordinated Creditor
shall not (i) ask, demand, sue for, take or receive from Payor, directly or indirectly, in cash or
other property or by set-off or in any manner (including, without limitation, from or by way of
collateral), payment of all or any of the Subordinated Debt, except such payments as otherwise
expressly permitted herein when no Blockage Event has occurred and is continuing, (ii) commence, or
join with any creditor other than the Administrative Agent in commencing, or directly or indirectly
cause Payor to commence, or assist Payor in commencing, any Insolvency Proceeding, or (iii) request
or accept any collateral or other security for all or any portion of the Subordinated Debt. If the
Subordinated Creditor, in contravention hereof, shall commence, prosecute or participate in any of
the actions, suits or proceedings referred to above in this paragraph, then the Administrative
Agent may intervene and interpose as a defense or plea the terms of this Note in its own name or in
the name of the Subordinated Creditor.

          (e) Until such time as all of the Senior Debt has been paid in full, if any Insolvency
Proceeding is commenced by or against Payor, the Subordinated Creditor authorizes and empowers the
Administrative Agent to file proofs of claim of the Subordinated Debt on behalf of the Subordinated
Creditor in any statutory or non-statutory proceeding as the agent and attorney-in-fact for the
Subordinated Creditor if the Subordinated Creditor fails to file such proofs of claim on or before
the date that is ten (10) days prior to the date such proofs of claim must be filed by the
Subordinated Creditor in accordance with applicable law; provided, however, that
(i) the foregoing authorization and empowerment (A) imposes no obligation on the Administrative
Agent to take any such action, and (B) is granted only for the specific and limited purpose for
which it is given, and (ii) the Administrative Agent shall have, prior to taking any such action,
given 15 days prior written notice (which notice may be given up to 60 days prior to the expiration
of the time to file such claim) to the Subordinated Creditor that it intends to file such claim or
proof of debt. Notwithstanding anything to the contrary herein, in no event may the Administrative
Agent, any Lender or any Secured Affiliate vote or take any other action related to any claim with
respect to the Subordinated Debt on behalf of the Subordinated Creditor, and such agency and
appointment of attorney-in-fact shall not extend to any such right to vote or take any other action
related to any such claim of the Subordinated Creditor, which rights to vote and take action the
Subordinated Creditor is hereby authorized to exercise and take.

          (f) All payments or distributions upon or with respect to the Subordinated Debt that are
received by the Subordinated Creditor contrary to the provisions of this Note shall be received in
trust for the benefit of the Administrative Agent, shall be segregated from other property or funds
of the Subordinated Creditor and shall be paid or delivered forthwith directly to the
Administrative Agent, for the account of the Secured Parties, in the same form as so received (with
any necessary endorsement or assignment), to be applied (in the case of cash) to, or held as
collateral (in the case of noncash property or securities) for, the payment, prepayment and/or cash
collateralization of the Senior Debt until all of the Senior Debt shall have been paid in full.

          (g) To the extent that Payor, the Subordinated Creditor or any of their respective
subsidiaries or any other Credit Party or guarantor of or provider of collateral for the

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Senior Debt shall make any payment on the Senior Debt that is subsequently invalidated,
declared to be fraudulent or preferential or set aside or is required to be repaid to a trustee,
receiver or any other party under any applicable Insolvency Law or equitable cause (any such
payment being a “Voided Payment”), then to the extent of such Voided Payment, that portion
of the Senior Debt that had been previously satisfied by such Voided Payment shall be reinstated
and continue in full force and effect as if such Voided Payment had never been made. To the extent
that the Subordinated Creditor shall have received any payments subsequent to the date of the
initial receipt of such Voided Payment by the Administrative Agent or any of the Secured Parties
and such payments have not been invalidated, declared to be fraudulent or preferential or set aside
or required to be repaid to a trustee, receiver or any other party under any applicable Insolvency
Law or equitable cause, the Subordinated Creditor shall be obligated and hereby agrees that any
such payment so made or received shall be deemed to have been received in trust for the benefit of
the Administrative Agent, and the Subordinated Creditor (by its acceptance hereof) hereby agrees to
pay to the Administrative Agent, upon demand, the full amount so received by the Subordinated
Creditor during such period of time to the extent necessary to fully restore to the Secured Parties
the amount of such Voided Payment, which amount shall be applied as set forth in the immediately
preceding paragraph.

          (h) The Subordinated Creditor will not:

	 	 	 	          (i) (A) cancel or otherwise discharge any of the Subordinated Debt (except (1) upon
payment in full of the Senior Debt, (2) by a conversion of all or any part of the
Subordinated Debt to a capital contribution to Payor in return for Equity Interests of Payor
or (3) as otherwise permitted by the Credit Agreement), or (B) convert or exchange any of
the Subordinated Debt into or for any other Indebtedness (other than any other Subordinated
Debt);
	 
	 	 	 	          (ii) sell, assign, pledge, encumber or otherwise dispose of any of the Subordinated
Debt other than the pledge of the instruments and agreements evidencing the Subordinated
Debt to the Global Administrative Agent (as defined in the Parent Credit Agreement) pursuant
to the Parent Credit Agreement or any of the other Combined Loan Documents (as defined in
the Parent Credit Agreement) or a transfer or other disposition of such instruments and
agreements in connection with a foreclosure under the Parent Credit Agreement or any of the
other Combined Loan Documents (as defined in the Parent Credit Agreement); or
	 
	 	 	 	          (iii) contest, or cause or encourage any other Person to contest, at any time, the
validity, perfection, priority or enforceability of the subordination provisions of this
Note, the Senior Debt, the agreements evidencing the Senior Debt or the security interests
or the Liens granted to the Administrative Agent or any of the other Secured Parties
pursuant thereto.

          (i) Subject to the payment in full of the Senior Debt, the Subordinated Creditor shall be
subrogated to the rights of the Lenders and the Secured Affiliates to receive payments or
distributions of assets of Payor in respect of the Senior Debt until the Subordinated Debt shall be
paid in full. For the purposes of such subrogation, payments or distributions to the
Administrative Agent, for the account of the Lenders and the Secured Affiliates, of any cash,

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property or securities to which the Subordinated Creditor would be entitled except for the
provisions of this Note shall be deemed, as between Payor and its creditors (other than the
Lenders, the Secured Affiliates and the Subordinated Creditor), to be a payment by Payor to or on
account of the Subordinated Debt, it being understood that the provisions of this Section 7(i) are, and are intended solely, for the purpose of defining the relative rights of the
Subordinated Creditor, on the one hand, and the Administrative Agent, the Lenders and the Secured
Affiliates, on the other hand.

          (j) The Lenders or other holders of the Senior Debt may, at any time and from time to time,
without any consent of or notice to the Subordinated Creditor or any other holder of the
Subordinated Debt and without impairing or releasing the obligations of the Subordinated Creditor
hereunder:

	 	 	 	          (i) change the manner, place or terms of payment of, or change or extend the time of
payment of, or renew payment or change or extend the time or payment of, or renew or alter,
the Senior Debt (including any change in the rate of interest thereon), or amend, supplement
or otherwise modify in any manner any Loan Document or other instrument, agreement or other
document under which any of the Senior Debt is outstanding;
	 
	 	 	 	          (ii) sell, exchange, release, not perfect and otherwise deal with any of the property
or assets of any Person at any time pledged, assigned or mortgaged to secure the Senior
Debt;
	 
	 	 	 	          (iii) release any Person liable in any manner under or in respect of the Senior Debt;
	 
	 	 	 	          (iv) exercise or refrain from exercising any rights against Payor, any of the other
Credit Parties or any of their respective Subsidiaries or any other Person;
	 
	 	 	 	          (v) apply to the Senior Debt any sums from time to time received by or on behalf of the
Administrative Agent or any of the Secured Parties; or
	 
	 	 	 	          (vi) sell, assign, transfer or exchange any of the Senior Debt.

          (k) Each of Payor and the Subordinated Creditor will, if reasonably requested by the
Administrative Agent, further mark their respective books of account in such a manner as shall be
effective to give proper notice of the effect of the subordination provisions of this Note. Each of
Payor and the Subordinated Creditor will, at Payor’s sole expense and at any time and from time to
time, promptly execute and deliver all further instruments and documents, and take all further
actions, that may be necessary or that the Administrative Agent may reasonably deem advisable and
may request in order to protect any right or interest granted or intended to be granted under the
subordination provisions of this Note or to enable the Administrative Agent or any of the other
Secured Parties to exercise and enforce its rights and remedies hereunder.

          (l) The Subordinated Creditor shall, upon reasonable request from time to time, from Payor,
any Secured Party or any other holder of Senior Debt or any party who intends to extend Senior Debt
to Payor, provide to the holder(s) of Senior Debt or any such prospective

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holder(s) of Senior Debt a written acknowledgment by the Subordinated Creditor addressed to
such holder(s) of Senior Debt to the effect that such holder of Senior Debt is a holder of the
Senior Debt entitled to the benefits of this Note, or, in the case of a prospective holder of
Senior Debt, to the effect that the credit to be extended by such prospective holder will be Senior
Debt and that such prospective holder will be entitled to the benefits of this Note.

          (m) Payor acknowledges and agrees that the provisions of this Note, including, without
limitation, the foregoing subordination provisions are, and are intended to be, an inducement and a
consideration to each Secured Party, whether the Senior Debt held by such Secured Party was created
or acquired before or after the issuance of this Note, to acquire and continue to hold, or to
continue to hold, such Senior Debt and such Secured Party shall be deemed conclusively to have
relied on the provisions of this Note, including, without limitation, such subordination
provisions, in acquiring and continuing to hold, or in continuing to hold, such Senior Debt.

          (n) The foregoing provisions regarding subordination are and are intended solely for the
purpose of defining the relative rights of the holders of the Senior Debt, on the one hand, and the
holders of the Subordinated Debt, on the other hand. Such provisions are for the benefit of the
holders of the Senior Debt and shall inure to the benefit of, and shall be enforceable by, the
Administrative Agent, on behalf of itself and the other Secured Parties, directly against the
holders of the Subordinated Debt, and no holder of the Senior Debt shall be prejudiced in its right
to enforce the subordination of any of the Subordinated Debt by any act or failure to act by Payor
or any Person in custody of its property or assets. The subordination provisions herein shall
constitute a continuing offer to each and every holder of Senior Debt from time to time and such
holders are intended third party beneficiaries hereof. Nothing contained in the foregoing
provisions is intended to or shall impair, as between Payor and the holders of the Subordinated
Debt, the obligations of Payor to such holders.

     8. WAIVER. PAYOR HEREBY WAIVES PROMPTNESS, DILIGENCE, PRESENTMENT FOR PAYMENT, DEMAND, NOTICE OF DISHONOR AND PROTEST AND ANY OTHER NOTICE WITH RESPECT TO THIS NOTE.

     9. Amendments, Etc. None of the provisions of this Note may be waived, amended,
supplemented or otherwise modified except in a writing signed by Payor and the Subordinated
Creditor; provided, however, that, until the Senior Debt has been paid in full, no
amendment, waiver or modification of this Note (including, without limitation, the subordination
provisions hereof), and no consent to any departure herefrom, that would violate Section 7.17 of
the Credit Agreement shall be effective unless the same shall be in writing and also signed by the
Administrative Agent, and then, in each case, such waiver, modification or consent shall be
effective only in the specific instance and for the specific purpose for which given.

     10. No Waiver; Cumulative Remedies. No failure on the part of the Subordinated
Creditor or the Administrative Agent to exercise, and no delay in exercising, any right, power or
privilege hereunder shall operate as a waiver thereof or a consent thereto; nor shall a single or
partial exercise of any such right, power or privilege preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The remedies provided herein are
cumulative and are not exclusive of any remedies provided by applicable law or in equity.

10

 

     11. Notices. All notices and other communications provided for herein shall be in
writing and shall be delivered by hand or overnight courier service, mailed by certified or
registered mail or sent by facsimile or electronic mail (e-mail), as follows:

	 	 	 
	If to Payor:

	 	Quicksilver Gas Services LP

c/o Quicksilver Gas Services GP LLC

777 West Rosedale Street, Suite 300

Fort Worth, Texas 76104

Attention: MarLu Hiller

FAX: 817-665-5016

Electronic Mail (E-mail): mhiller@qrinc.com
	 
	 	 
	If to the Subordinated Creditor:

	 	Quicksilver Resources Inc.

777 West Rosedale Street, Suite 300

Fort Worth, Texas 76104

Attention: MarLu Hiller

FAX: 817-665-5016

Electronic Mail (E-mail): mhiller@qrinc.com
	 
	 	 
	If to the Administrative Agent:

	 	Bank of America, N.A.

700 Louisiana Street, 8th Floor

TX4-213-08-14

Houston, Texas 77002

Attention: Ronald E. McKaig

FAX: 713-247-7286

Electronic Mail (E-mail): 

ronald.e.mckaig@bankofamerica.com

     12. Assignment. This Note shall be binding upon the successors and assigns of Payor
and shall inure to the benefit of the Subordinated Creditor and its successors and assigns;
provided, however, that Payor shall not assign, delegate or otherwise transfer any of its rights or
obligations under this Note without the prior written consent of the Subordinated Creditor.

     13. No Credit Support. Payor and the Subordinated Creditor (by its acceptance hereof)
acknowledge and agree that this Note is not secured by any mortgage, Lien, pledge, charge,
financing statement, security interest, hypothecation, or other security instrument of any type.
Payor and the Subordinated Creditor (by its acceptance hereof) further acknowledge and agree that
this Note is not supported directly or indirectly by any Guarantee of any person or entity. Payor
and the Subordinated Creditor (by its acceptance hereof) further agree that Payor will not grant,
or cause any other Credit Party to grant any Lien securing this Note or provide any Guarantee for
the payment of this Note until the Senior Debt has been paid in full.

     14. Severability. Any provision of this Note which is prohibited or unenforceable in
any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition
or unenforceability without invalidating the remaining provisions hereof; and any such prohibition

11

 

or unenforceability in any jurisdiction shall not invalidate or render unenforceable such
provision in any other jurisdiction.

     15. Usury Savings Clause. (a) It is the intention of the parties hereto to comply
with applicable state and federal usury laws (now or hereafter enacted). Accordingly,
notwithstanding any provision to the contrary in this Note, in no event (including, but not limited
to, prepayment or acceleration of the maturity of any obligation) shall this Note require the
payment or permit the collection of interest in excess of the Highest Lawful Rate. If, under any
circumstance whatsoever, any provision of this Note shall provide for the payment or collection of
interest in excess of the Highest Lawful Rate, then, ipso facto, the obligation to
be fulfilled shall be reduced to the limit of such validity, and if from any such circumstances the
Subordinated Creditor shall ever receive anything of value as interest or deemed interest by
applicable law under this Note or otherwise an amount that would exceed the Highest Lawful Rate,
such amount that would be excessive interest shall be applied to the reduction of the principal
amount owing under this Note or on account of any other indebtedness of Payor to the Subordinated
Creditor, and not to the payment of interest, or if such excessive interest exceeds the unpaid
balance of principal of this Note and such other indebtedness, such excess shall be refunded to
Payor. In determining whether or not the interest paid or payable with respect to any indebtedness
of Payor to the Subordinated Creditor, under any specified contingency, exceeds the Highest Lawful
Rate, Payor and the Subordinated Creditor shall, to the maximum extent permitted by applicable law,
(i) characterize any non-principal payment as an expense, fee or premium rather than as interest,
(ii) exclude voluntary prepayments and the effects thereof, (iii) amortize, prorate, allocate and
spread the total amount of interest throughout the full term of such indebtedness so that interest
thereon does not exceed the maximum amount permitted by applicable law, and/or (iv) allocate
interest between portions of such indebtedness, to the end that no such portion shall bear interest
at a rate greater than that permitted by applicable law.

          (b) If at any time the interest rate hereunder (the “Stated Rate”) exceeds the Highest
Lawful Rate, then the rate at which interest shall accrue hereunder shall automatically be limited
to the Highest Lawful Rate, and shall remain at the Highest Lawful Rate until the total amount of
interest accrued hereunder equals the total amount of interest that would have accrued but for the
operation of this sentence. Thereafter, interest shall accrue at the Stated Rate unless and until
the Stated Rate again exceeds the Highest Lawful Rate, in which case the immediately preceding
sentence shall apply.

     16. Jurisdiction, Etc. (a) THIS NOTE SHALL BE DEEMED TO BE A CONTRACT UNDER THE LAWS
OF THE STATE OF TEXAS. Payor hereby irrevocably and unconditionally submits, for itself and its
property, to the nonexclusive jurisdiction of the United States District Court for the Northern
District of Texas and of any Texas State court sitting in Tarrant or Dallas County, Texas, and any
appellate court from any thereof, for purposes of any action or proceeding arising out of or
relating to this Note, or for recognition or enforcement of any judgment, and Payor hereby
irrevocably and unconditionally agrees that all claims in respect of any such action or proceeding
may be heard and determined in any such court. Payor agrees that a final judgment in any such
action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the
judgment or in any other manner provided by law. Nothing in this Note shall affect any right that
the Subordinated Creditor may otherwise have to bring any action or proceeding relating to this
Note in the courts of any jurisdiction.

12

 

          (b) Payor irrevocably and unconditionally waives, to the fullest extent it may legally and
effectively do so, any objection that it may now or hereafter have to the laying of venue of any
suit, action or proceeding arising out of or relating to this Note in any such court. Payor hereby
irrevocably waives, to the fullest extent permitted by applicable law, the defense of an
inconvenient forum to the maintenance of such action or proceeding in any such court.

          (c) Payor agrees to not assert any claim against the Subordinated Creditor, any of its
affiliates or any of their respective directors, officers, attorneys, agents and advisers, for
special, indirect, consequential or punitive damages arising out of or otherwise relating to this
Note, any of the transactions contemplated herein or the actual or proposed use of the loan
evidenced by this Note.

     17. Relationship of the Parties. Notwithstanding any business or personal
relationship between Payor and the Subordinated Creditor, or any officer, director or employee of
the Subordinated Creditor, that may exist or have existed, the relationship between Payor and the
Subordinated Creditor under and with respect to this Note is solely that of debtor and creditor,
the Subordinated Creditor has no fiduciary or other special relationship with Payor by virtue of
this Note, Payor and the Subordinated Creditor are not partners or joint venturers, and no term or
condition of any of this Note shall be construed so as to deem the relationship between Payor and
the Subordinated Creditor to be other than that of debtor and creditor.

     18. Right of Set-off. Subject to the subordination provisions contained in
Section 7 hereof, the Subordinated Creditor is hereby authorized at any time and from time
to time, to the fullest extent permitted by applicable law, to set off and apply any and all
indebtedness, obligations or liabilities at any time owing by the Subordinated Creditor to or for
the credit or the account of Payor against any and all of the obligations of Payor now or hereafter
existing under this Note, whether or not the Subordinated Creditor shall have made any demand under
this Note and although such obligations may be unmatured. The rights of the Subordinated Creditor
under this Section 18 are in addition to other rights and remedies (including, without
limitation, other rights of set off) which the Subordinated Creditor may have.

     19. Costs and Expenses. Subject to the subordination provisions contained in
Section 7 hereof, Payor agrees to pay on demand all costs and expenses incurred by the
Subordinated Creditor in connection with the preparation, execution, delivery, administration,
modification and amendment of this Note, including, without limitation, the reasonable attorneys’
fees and expenses of the Subordinated Creditor with respect thereto and with respect to advising
the Subordinated Creditor as to its rights and responsibilities under this Note. Subject to the
subordination provisions contained in Section 7 hereof, Payor further agrees to pay on
demand all losses, costs and expenses, if any (including attorneys’ fees and expenses), in
connection with the enforcement (whether through negotiations, legal proceedings or otherwise) of
this Note, including, without limitation, attorneys’ fees and expenses in connection with the
enforcement of rights under this Section 19. In addition, Payor shall pay any and all
stamp and other taxes payable or determined to be payable in connection with the execution and
delivery of this Note, and agrees to save the Subordinated Creditor harmless from and against any
and all liabilities with respect to or resulting from any delay in paying or omission to pay such
taxes.

13

 

     20. Representations and Warranties. Payor hereby represents and warrants to the
Subordinated Creditor that (a) Payor’s execution, delivery and performance of this Note have been
authorized by all necessary action; (b) it has the requisite power and authority to execute,
deliver and perform its obligations under this Note; (c) this Note has been duly executed and
delivered to the Subordinated Creditor by Payor; and (d) this Note is the legal, valid and binding
obligation of Payor, enforceable against Payor in accordance with its terms, subject to applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the enforceability of
creditors’ rights generally and by general principles of equity.

     21. WAIVER OF JURY TRIAL. PAYOR HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL
BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS NOTE.

     22. GOVERNING LAW. THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH,
THE LAWS OF THE STATE OF TEXAS, WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES THEREOF.

     23. ENTIRE AGREEMENT. THIS NOTE REPRESENTS THE FINAL, ENTIRE AGREEMENT BETWEEN THE
PARTIES REGARDING THE SUBJECT MATTER HEREOF 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.

     24. No Recourse. Notwithstanding anything to the contrary in this Note, in no event
shall the Subordinated Creditor have any recourse against the assets of the Subordinated Creditor
or any of its Restricted Subsidiaries (as such term is defined in the First Supplemental Indenture,
dated as of March 16, 2006, by and among the Subordinated Creditor, the subsidiary guarantors
parties thereto and The Bank of New York, as Trustee (as successor in interest to JPMorgan Chase
Bank, National Association), as such First Supplemental Indenture may be amended, modified,
restated, supplemented or replaced from time to time, or any comparable term in any other
documentation now or hereafter evidencing any Indebtedness of the Subordinated Creditor) for any of
the Subordinated Debt pursuant to this Note.

[Signature on Following Page]

14

 

     IN WITNESS WHEREOF, Payor has caused this instrument to be duly executed and delivered to the
Subordinated Creditor by a Responsible Officer of the general partner of Payor on behalf of Payor
as of August 10, 2007.

	 	 	 	 	 	 
	 	QUICKSILVER GAS SERVICES LP,
a Delaware limited partnership

	 
	 	By:  	Quicksilver Gas Services GP LLC,
a Delaware limited liability company, its
General Partner	 
	 	 	 	 	 	 
	 	 	By:  	/s/  MarLu Hiller	 
	 	 	 	MarLu Hiller,
Vice President - Treasurerexv10w3

 

CONTRIBUTION, CONVEYANCE

AND ASSUMPTION AGREEMENT

BY AND AMONG

QUICKSILVER GAS SERVICES LP

QUICKSILVER GAS SERVICES GP LLC

COWTOWN GAS PROCESSING L.P.

COWTOWN PIPELINE L.P.

QUICKSILVER GAS SERVICES HOLDINGS LLC

QUICKSILVER GAS SERVICES OPERATING GP LLC

QUICKSILVER GAS SERVICES OPERATING LLC

AND

THE PRIVATE INVESTORS

 

 

                  TABLE OF CONTENTS

	 	 	 	 	 	 	 
	 

	 	ARTICLE 1	 	 	 	 
	 

	 	DEFINITIONS	 	 	 	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE 2	 	 	 	 
	 

	 	CONTRIBUTIONS, ACKNOWLEDGMENTS AND DISTRIBUTIONS	 	 	 	 
	 
	 	 	 	 	 	 
	Section 2.1

	 	Contribution by Holdings of the Interests to MLP GP
	 	 	4	 
	Section 2.2

	 	Contribution by MLP GP of the Interests to MLP
	 	 	4	 
	Section 2.3

	 	Contribution by Holdings of the OPGP Interests to MLP
	 	 	5	 
	Section 2.4

	 	Contribution by Little Hoss of Limited Partner Interest in each of Pipeline Partners and Processing Partners to MLP
	 	 	5	 
	Section 2.5

	 	Contribution by LGS Godley of Limited Partner Interest in Pipeline Partners to MLP
	 	 	5	 
	Section 2.6

	 	Waiver of Private Investors’ Redemption Rights
	 	 	6	 
	Section 2.7

	 	Underwriters’ Cash Contribution
	 	 	6	 
	Section 2.8

	 	Payment of Transaction Costs
	 	 	6	 
	Section 2.9

	 	Contribution by MLP of Limited Partner Interests and OPGP Interests to OLLC
	 	 	6	 
	Section 2.10

	 	Redemption of Holdings Initial MLP Interest
	 	 	6	 
	 

	 	ARTICLE 3	 	 	 	 
	 

	 	ADDITIONAL TRANSACTIONS	 	 	 	 
	Section 3.1

	 	Purchase of Additional Common Units
	 	 	6	 
	 

	 	ARTICLE 4	 	 	 	 
	 

	 	FURTHER ASSURANCES	 	 	 	 
	Section 4.1

	 	Further Assurances
	 	 	6	 
	Section 4.2

	 	Other Assurances
	 	 	7	 
	 

	 	ARTICLE 5	 	 	 	 
	 

	 	EFFECTIVE TIME	 	 	 	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE 6	 	 	 	 
	 

	 	MISCELLANEOUS	 	 	 	 
	Section 6.1

	 	Order of Completion of Transactions
	 	 	7	 
	Section 6.2

	 	Headings; References; Interpretation
	 	 	7	 
	Section 6.3

	 	Successors and Assigns
	 	 	8	 
	Section 6.4

	 	No Third Party Rights
	 	 	8	 
	Section 6.5

	 	Counterparts
	 	 	8	 
	Section 6.6

	 	Governing Law
	 	 	8	 
	Section 6.7

	 	Severability
	 	 	8	 
	Section 6.8

	 	Amendment or Modification
	 	 	8	 
	Section 6.9

	 	Integration
	 	 	8	 
	Section 6.10

	 	Deed; Bill of Sale; Assignment
	 	 	9	 

i 

 

CONTRIBUTION, CONVEYANCE

AND ASSUMPTION AGREEMENT

     This CONTRIBUTION, CONVEYANCE AND ASSUMPTION AGREEMENT, dated as of August 10, 2007, is
entered into by and among QUICKSILVER GAS SERVICES LP, a Delaware limited partnership (“MLP”),
QUICKSILVER GAS SERVICES GP LLC, a Delaware limited liability company (“MLP GP”), COWTOWN GAS
PROCESSING L.P., a Delaware limited partnership (“Processing”), COWTOWN PIPELINE L.P., a Delaware
limited partnership (“Pipeline”), QUICKSILVER GAS SERVICES HOLDINGS LLC, a Delaware limited
liability company (“Holdings”), QUICKSILVER GAS SERVICES OPERATING GP LLC, a Delaware limited
liability company (“OPGP”), QUICKSILVER GAS SERVICES OPERATING LLC, a Delaware limited liability
company (“OLLC”), LITTLE HOSS COWTOWN PROCESSING PARTNERS, a Texas general partnership (“Little
Hoss Cowtown Processing”), LITTLE HOSS COWTOWN PIPELINE PARTNERS, a Texas general partnership
(“Little Hoss Cowtown Pipeline”; Little Hoss Cowtown Processing and Little Hoss Cowtown Pipeline
are collectively referred to herein as “Little Hoss”), and LGS-GODLEY INVESTMENTS, LLC, a Texas
limited liability corporation (“LGS-Godley,” and together with Little Hoss, the “Private
Investors”). The parties to this Agreement are collectively referred to herein as the “Parties.”
Capitalized terms used herein shall have the meanings assigned to such terms in Section 1.1.

RECITALS

     WHEREAS, MLP GP and Holdings have formed MLP, pursuant to the Delaware Revised Uniform Limited
Partnership Act (the “Delaware LP Act”), for the purpose of engaging in any business activity that
is approved by MLP GP and that lawfully may be conducted by a limited partnership organized
pursuant to the Delaware LP Act.

     WHEREAS, in order to accomplish the objectives and purposes in the preceding recital, the
following actions have been taken prior to the date hereof:

          1. Processing, Pipeline and the Private Investors currently hold the interests in Cowtown Gas
Processing Partners L.P. (“Processing Partners”) and Cowtown Pipeline Partners L.P. (“Pipeline
Partners”) as set forth on Schedule I hereto.

          2. Processing and Pipeline formed Holdings, under the Delaware Limited Liability Company Act
(the “Delaware LLC Act”); Processing contributed $500 to Holdings in exchange for a 50% member
interest in Holdings; and Pipeline contributed $500 to Holdings in exchange for a 50% member
interest in Holdings.

          3. Holdings formed OPGP, under the Delaware LLC Act, to which Holdings contributed $1,000 in
exchange for all of the member interests in OPGP.

          4. Holdings formed MLP GP, under the Delaware LLC Act, and contributed $1,000 to MLP GP in
exchange for all of the member interests in MLP GP.

          5. MLP GP and Holdings formed MLP, under the Delaware LP Act; MLP GP contributed $20.00 to MLP
in exchange for a 2% general partner interest in MLP; and

 

 

Holdings contributed $980.00 to MLP in exchange for a 98% limited partner interest (the
“Holdings Initial MLP Interest”) in MLP.

          6. MLP formed OLLC, under the Delaware LLC Act, and contributed $1,000 to OLLC in exchange for
all of the member interests in OLLC.

          7. Pipeline contributed its 1% general partner interest and 92% limited partner interest in
Pipeline Partners to Holdings in exchange for units representing a 53% member interests in
Holdings.

          8. Processing contributed its 1% general partner interest and 94% limited partner interest in
Processing Partners to Holdings in exchange for units representing a 47% member interests in
Holdings.

          9. Holdings contributed its 1% general partner interests in each of Pipeline Partners and
Processing Partners to OPGP in exchange for a continuation of its member interests in OPGP.

     WHEREAS, concurrently with the consummation of the transactions contemplated hereby (the
“Closing”), each of the following matters shall occur:

          1. Holdings will contribute to MLP GP part of its limited partner interests in each of
Pipeline Partners and Processing Partners with an aggregate value equal to 2% of the equity value
of MLP immediately after the Closing (the “Interests”), as a capital contribution.

          2. MLP GP will convey the Interests to MLP in exchange for (a) 469,944 general partner units
representing a continuation of its 2% general partner interest in MLP and (b) the issuance to MLP
GP of all of the incentive distribution rights (the “IDRs”) of MLP.

          3. Holdings will convey all of its member interests in OPGP and the rest of its limited
partner interests in each of Pipeline Partners and Processing Partners to MLP in exchange for (a)
11,513,625 Subordinated Units in MLP and 5,696,752 Common Units in MLP (representing an aggregate
73.2% limited partner interest) and (b) the right to receive $162.1 million for reimbursement of
certain capital expenditures.

          4. Little Hoss will (a) convey all of its limited partner interests in each of Pipeline
Partners and Processing Partners (as set forth on Schedule I hereto) to MLP, and (b) assign
and transfer to MLP, and waive and relinquish, all of its rights, claims and interests in and to
the Redemption Agreements (as defined below), in exchange for (x) 684,668 Common Units in MLP
(representing a 3.0% interest) and (y) the right to receive $6,449,180 for reimbursement of certain
capital expenditures.

          5. LGS-Godley will (a) convey all of its limited partner interests in Pipeline Partners (as
set forth on Schedule I hereto) to MLP, and (b) assign and transfer to MLP, and waive and
relinquish, all of its rights, claims and interests in and to the CPP Redemption Agreement (as
defined below), in exchange for (x) 132,205 Common Units in MLP (representing a 0.5% interest) and
(y) the right to receive $1,245,290 for reimbursement of certain capital expenditures

-2-

 

          6. The public, through the Underwriters, will contribute $105.0 million in cash, less the
Underwriters’ discount and structuring fees of $7.35 million, in exchange for 5,000,000 Common
Units in MLP (representing a 21.3% interest).

          7. MLP will (a) pay transaction expenses associated with the transactions contemplated by this
Agreement in the amount of approximately $3.0 million (exclusive of the Underwriters’ discount),
(b) distribute $112.1 million in cash and a $50.0 million subordinated note payable to Holdings for
reimbursement of certain capital expenditures and (c) distribute $7.7 million to the Private
Investors for reimbursement for certain capital expenditures.

          8. MLP will convey to OLLC, as a capital contribution, its limited partner interests in each
of Pipeline Partners and Processing Partners and all of the member interests in OPGP (the “OPGP
Interests”).

          9. MLP will redeem from Holdings and retire the Holdings Initial MLP Interest in exchange for
a payment in cash to Holdings of $980.00.

          10. The agreements of limited partnership and the limited liability company agreements of the
aforementioned entities will be amended and restated to the extent necessary to reflect the matters
and transaction mentioned in this Agreement.

     WHEREAS, within 30 days of the Closing, if the Underwriters exercise their option to purchase
up to an additional 750,000 Common Units (the “Option”), MLP shall use proceeds of that exercise,
net of the applicable Underwriters’ discount, for general partnership purposes;

     NOW, THEREFORE, in consideration of their mutual undertakings and agreements hereunder, the
Parties undertake and agree as follows:

ARTICLE 1

DEFINITIONS

          Section 1.1 The following capitalized terms shall have the meanings given below.

          (a) “Agreement” means this Contribution, Conveyance and Assumption Agreement.

          (b) “Common Unit” has the meaning assigned to such term in the Partnership Agreement.

          (c) “CGPP Redemption Agreement” means the Redemption Agreement, dated April 3, 2006, by and
between Little Hoss Ranch Partners, L.P. and Cowtown Gas Processing Partners L.P.

          (d) “CPP Redemption Agreement” means the Redemption Agreement, dated April 3, 2006, by and
among Little Hoss Ranch Partners, L.P., LGS-Godley Ranch Co. and Cowtown Pipeline Partners L.P.

-3-

 

          (e) “Effective Time” shall mean 8:00 a.m. New York, New York time on the date of the
consummation of the Offering.

          (f) “IDRs” means “Incentive Distribution Rights” as such term is defined in the Partnership
Agreement.

          (g) “MLP” has the meaning assigned to such term in the opening paragraph of this Agreement.

          (h) “Offering” means the initial public offering by MLP of Common Units.

          (i) “Omnibus Agreement” means that certain Omnibus Agreement of even date herewith, among MLP,
MLP GP and Quicksilver Resources Inc.

          (j) “Partnership Agreement” means the First Amended and Restated Agreement of Limited
Partnership of Quicksilver Gas Services LP dated as of the Effective Date.

          (k) “Partnership Group” has the meaning assigned to such term in the Omnibus Agreement.

          (l) “Redemption Agreements” means, collectively, the CGPP Redemption Agreement and the CPP
Redemption Agreement.

          (m) “Registration Statement” means the registration statement on Form S-1 (Registration No.
333-140599) filed by MLP relating to the Offering, as amended.

          (n) “Subordinated Unit” has the meaning assigned to such term in the Partnership Agreement.

          (o) “Underwriters” means UBS Securities LLC, Goldman, Sachs & Co., A.G. Edwards & Sons, Inc.,
J.P. Morgan Securities Inc. and Fortis Securities LLC.

          (p) “Underwriting Agreement” means the underwriting agreement dated August 6, 2007 among MLP,
MLP GP, Holdings and Quicksilver Resources Inc. on the one hand, and the Underwriters on the other
hand, relating to the Offering.

ARTICLE 2

CONTRIBUTIONS, ACKNOWLEDGMENTS AND DISTRIBUTIONS

          Section 2.1 Contribution by Holdings of the Interests to MLP GP. Holdings hereby grants,
contributes, bargains, conveys, assigns, transfers, sets over and delivers to MLP GP, its
successors and assigns, for its and their own use forever, all right, title and interest in and to
the Interests, as a capital contribution, for good and valuable consideration, the sufficiency of
which is hereby acknowledged, and MLP GP hereby accepts the Interests as a contribution to the
capital of MLP GP.

          Section 2.2 Contribution by MLP GP of the Interests to MLP. MLP GP hereby grants, contributes, bargains, conveys, assigns, transfers, sets over and
delivers to MLP,

-4-

 

its successors and assigns, for its and their own use forever, all right, title
and interest in and to the Interests, as a capital contribution, in exchange for (a) a continuation
of its 2% general partner interest in MLP, (b) the issuance by MLP to MLP GP of the IDRs and (c)
other good and valuable consideration, the sufficiency of which is hereby acknowledged, and MLP
hereby accepts the Interests as a contribution to the capital of MLP.

          Section 2.3 Contribution by Holdings of the OPGP Interests to MLP. Holdings hereby grants,
contributes, bargains, conveys, assigns, transfers, sets over and delivers to MLP, its successors
and assigns, for its and their own use forever, all right, title and interest in and to the OPGP
Interests and the remaining limited partner interests in each of Pipeline Partners and Processing
Partners in exchange for (a) the issuance by MLP to Holdings of 11,513,625 Subordinated Units,
representing 49.0% interest in MLP, (b) the issuance by MLP to Holdings of 5,696,752 Common Units,
representing a 24.2% interest in MLP, (c) the right to receive $162.1 million for reimbursement of
certain capital expenditures and (d) other good and valuable consideration, the sufficiency of
which is hereby acknowledged, and MLP hereby accepts the OPGP Interests and the remaining limited
partner interests in each of Pipeline Partners and Processing Partners as a contribution to the
capital of MLP and agrees to be bound by the terms of the Limited Liability Company Agreement of
OPGP as its sole member.

          Section 2.4 Contribution by Little Hoss of Limited Partner Interest in each of Pipeline Partners and
Processing Partners to MLP. Little Hoss hereby grants, contributes, bargains, conveys,
assigns, transfers, sets over and delivers to MLP, its successors and assigns, for its and their
own use forever, all right, title and interest in and to its limited partner interests in each of
Pipeline Partners and Processing Partners, as set forth on Schedule I hereto, in exchange
for (a) the issuance by MLP to Little Hoss of 684,668 Common Units, representing a 3.0% interest in
MLP, (b) the right to receive $6,449,180 for reimbursement of certain capital expenditures and (c)
other good and valuable consideration, the sufficiency of which is hereby acknowledged, and MLP
hereby accepts such limited partner interests as a contribution to the capital of MLP, and,
effective as of the completion of the conveyance to MLP of the limited partner interests in each of
Pipeline Partners and Processing Partners and Sections 2.4 and 2.7 of this Agreement, agrees to be
bound by the terms of the Limited Partnership Agreement of each of Pipeline Partners and Processing
Partners with respect to the limited partner interests in Pipeline Partners and Processing Partners
so conveyed to MLP.

          Section 2.5 Contribution by LGS-Godley of Limited Partner Interest in Pipeline Partners to MLP.
LGS-Godley hereby grants, contributes, bargains, conveys, assigns, transfers, sets over and
delivers to MLP, its successors and assigns, for its and their own use forever, all right, title
and interest in and to its limited partner interests in Pipeline Partners, as set forth on
Schedule I hereto, in exchange for (a) the issuance by MLP to LGS-Godley of 132,205 Common
Units, representing a 0.5% interest in MLP, (b) the right to receive $1,245,290 for
reimbursement of certain capital expenditures and (c) other good and valuable consideration,
the sufficiency of which is hereby acknowledged, and MLP hereby accepts such limited partner
interests as a contribution to the capital of MLP, and, effective as of the completion of the
conveyance to MLP of the limited partner interest in Pipeline Partners and Sections 2.4 and 2.7 of
this Agreement, agrees to be bound by the terms of the Limited Partnership Agreement of Pipeline
Partners with respect to the limited partner interest in Pipeline Partners so conveyed to MLP.

-5-

 

          Section 2.6 Waiver of Private Investors’ Redemption Rights. The Parties acknowledge that, in
partial consideration for the consideration to be received by the Private Investors pursuant to
Sections 2.4 and 2.5 above, each of the Private Investors assigns and transfers to MLP, and waives
and relinquishes, any and all rights, claims and interests under the Redemption Agreements.

          Section 2.7 Underwriters’ Cash Contribution. The Parties acknowledge that the Underwriters have,
pursuant to the Underwriting Agreement, made a capital contribution to MLP of approximately $105.0
million in cash ($97.65 million net to MLP after the underwriting discount and fees of $7.35
million) in exchange for the issuance by MLP to the Underwriters of 5,000,000 Common Units,
representing an 21.3% interest in MLP.

          Section 2.8 Payment of Transaction Costs. The Parties acknowledge (a) the payment by MLP, in
connection with the Closing, of transaction expenses in the amount of approximately $3.0 million
(exclusive of the Underwriters’ discount), (b) the distribution of $112.1 million in cash and a
$50.0 million subordinated note payable to Holdings for reimbursement of certain capital
expenditures and (c) the distribution of $7.7 million to the Private Investors for reimbursement of
certain capital expenditures.

          Section 2.9 Contribution by MLP of Limited Partner Interests and OPGP Interests to OLLC. MLP
hereby grants, contributes, bargains, conveys, assigns, transfers, sets over and delivers to OLLC,
its successors and assigns, for its and their own use forever, all right, title and interest in and
to MLP’s limited partner interests in each of Pipeline Partners and Processing Partners, and the
OPGP Interests, as a capital contribution.

          Section 2.10 Redemption of Holdings Initial MLP Interest. MLP hereby agrees to redeem from
Holdings and agrees to retire the Holdings Initial MLP Interest in exchange for a payment in cash
to Holdings of $980.00.

ARTICLE 3

ADDITIONAL TRANSACTIONS

          Section 3.1 Purchase of Additional Common Units. If the Option is exercised in whole or in part,
the Underwriters will contribute additional cash to MLP in exchange for up to an additional 750,000
Common Units on the basis of the initial public offering price per Common Unit set forth in the
Registration Statement, net of underwriting discounts and fees.

ARTICLE 4

FURTHER ASSURANCES

          Section 4.1 Further Assurances. From time to time after the Effective Time, and without any
further consideration, the Parties agree to execute, acknowledge and deliver all such additional
deeds, assignments, bills of sale, conveyances, instruments, notices, releases, acquittances and
other documents, and will do all such other acts and things, all in accordance with applicable law,
as may be necessary or appropriate (a) more fully to assure that the applicable Parties own all of
the properties, rights, titles, interests, estates, remedies, powers and privileges granted by this
Agreement, or which are intended to be so granted, or (b) more fully

-6-

 

and effectively to vest in the applicable Parties and their respective successors and assigns beneficial and record title to the
interests contributed and assigned by this Agreement or intended so to be and to more fully and
effectively carry out the purposes and intent of this Agreement.

          Section 4.2 Other Assurances. From time to time after the Effective Time, and without any further
consideration, each of the Parties shall execute, acknowledge and deliver all such additional
instruments, notices and other documents, and will do all such other acts and things, all in
accordance with applicable law, as may be necessary or appropriate to more fully and effectively
carry out the purposes and intent of this Agreement. Without limiting the generality of the
foregoing, the Parties acknowledge that the Parties have used their good faith efforts to attempt
to identify all of the assets being contributed to MLP or its subsidiaries as required in
connection with the Offering. It is the express intent of the Parties that MLP or its subsidiaries
own all assets necessary to operate the assets that are identified in this Agreement and in the
Registration Statement. To the extent any assets were not identified but are necessary to the
operation of assets that were identified, then the intent of the Parties is that all such
unidentified assets are intended to be conveyed to the appropriate members of the Partnership
Group. To the extent such assets are identified at a later date, the Parties shall take the
appropriate actions required in order to convey all such assets to the appropriate members of the
Partnership Group. Likewise, to the extent that assets are identified at a later date that were
not intended by the Parties to be conveyed as reflected in the Registration Statement, the Parties
shall take the appropriate actions required in order to convey all such assets to the appropriate
Party.

ARTICLE 5

EFFECTIVE TIME

     Notwithstanding anything contained in this Agreement to the contrary, none of the provisions
of Article 2 or Article 3 of this Agreement shall be operative or have any effect until the
Effective Time, at which time all the provisions of Article 2 and Article 3 of this Agreement shall
be effective and operative in accordance with Article 6, without further action by any Party
hereto.

ARTICLE 6

MISCELLANEOUS

     Section 6.1 Order of Completion of Transactions. The transactions provided for in Article 2 and
Article 3 of this Agreement shall be completed immediately following the Effective Time in the
following order: first, the transactions provided for in Article 2 shall be completed in the order
set forth therein; and second, following the completion of the transactions as provided in Article
2, the transactions, if they occur, provided for in Article 3 shall be completed.

     Section 6.2 Headings; References; Interpretation. All Article and Section headings in this
Agreement are for convenience only and shall not be deemed to control or affect the meaning or
construction of any of the provisions hereof. The words “hereof,” “herein” and “hereunder” and
words of similar import, when used in this Agreement, shall refer to this Agreement as a whole and
not to any particular provision of this Agreement. All references herein to Articles and Sections
shall, unless the context requires a different construction, be

-7-

 

deemed to be references to the Articles and Sections of this Agreement. All personal pronouns used in this Agreement, whether
used in the masculine, feminine or neuter gender, shall include all other genders, and the singular
shall include the plural and vice versa. The use herein of the word “including” following any
general statement, term or matter shall not be construed to limit such statement, term or matter to
the specific items or matters set forth immediately following such word or to similar items or
matters, whether or not non-limiting language (such as “without limitation”, “but not limited to”,
or words of similar import) is used with reference thereto, but rather shall be deemed to refer to
all other items or matters that could reasonably fall within the broadest possible scope of such
general statement, term or matter.

          Section 6.3 Successors and Assigns. The Agreement shall be binding upon and inure to the benefit
of the Parties and their respective successors and assigns.

          Section 6.4 No Third Party Rights. The provisions of this Agreement are intended to bind the
Parties as to each other and are not intended to and do not create rights in any other person or
confer upon any other person any benefits, rights or remedies and no person is or is intended to be a third
party beneficiary of any of the provisions of this Agreement.

          Section 6.5 Counterparts. This Agreement may be executed in any number of counterparts, all of
which together shall constitute one agreement binding on the Parties hereto.

          Section 6.6 Governing Law. This Agreement shall be governed by, and construed in accordance with,
the laws of the State of Texas.

          Section 6.7 Severability. If any of the provisions of this Agreement are held by any court of
competent jurisdiction to contravene, or to be invalid under, the laws of any political body having
jurisdiction over the subject matter hereof, such contravention or invalidity shall not invalidate
the entire Agreement. Instead, this Agreement shall be construed as if it did not contain the
particular provision or provisions held to be invalid and an equitable adjustment shall be made and
necessary provision added so as to give effect to the intention of the Parties as expressed in this
Agreement at the time of execution of this Agreement.

          Section 6.8 Amendment or Modification. This Agreement may be amended or modified from time to
time only by the written agreement of all the Parties. Each such instrument shall be reduced to
writing and shall be designated on its face as an Amendment to this Agreement.

          Section 6.9 Integration. This Agreement and the instruments referenced herein supersede all
previous understandings or agreements among the Parties, whether oral or written, with respect to
their subject matter. This document and such instruments contain the entire understanding of the
Parties with respect to the subject matter hereof and thereof. No understanding, representation,
promise or agreement, whether oral or written, is intended to be or shall be included in or form
part of this Agreement unless it is contained in a written amendment hereto executed by the Parties
hereto after the date of this Agreement.

-8-

 

          Section 6.10 Deed; Bill of Sale; Assignment. To the extent required and permitted by applicable
law, this Agreement shall also constitute a “deed,” “bill of sale” or “assignment” of the assets
and interests referenced herein.

[Signature page follows]

-9-

 

     IN WITNESS WHEREOF, this Agreement has been duly executed by the Parties hereto as of the date
first above written.

	 	 	 	 	 
	 	QUICKSILVER GAS SERVICES LP

 	 
	 	By:  	Quicksilver Gas Services GP LLC, its general partner
 	 
	 	 	 	 
	 	 	 	 
	 
	 	 	 
	 	By:  	/s/ Philip Cook	 
	 	 	  	Name:  Philip Cook 	 
	 	 	  	Title:    Senior Vice President—Chief Financial Officer 	 
	 
	 	QUICKSILVER GAS SERVICES GP LLC

 	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer 	 
	 
	 	QUICKSILVER GAS SERVICES HOLDINGS LLC

 	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer 	 
	 
	 	QUICKSILVER GAS SERVICES OPERATING GP LLC

 	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer 	 
	 
	 	QUICKSILVER GAS SERVICES OPERATING LLC

 	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer
	 
	 

 

 

	 	 	 	 	 
	 	COWTOWN GAS PROCESSING L.P.

 	 
	 	By:  Cowtown Pipeline Management, Inc., its general partner 
	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer 	 
	 
	 	COWTOWN PIPELINE L.P.

 	 
	 	By:  	Cowtown Pipeline Management, Inc., its general partner
 	 
	 
	 	By:  	/s/ Philip Cook 	 
	 	 	Name:  	Philip Cook 	 
	 	 	Title:  	Senior Vice President—Chief Financial Officer 	 
	 
	 	LITTLE HOSS COWTOWN PROCESSING PARTNERS

 	 
	 	By:  	AEM Ranch, L.L.C., managing partner
 	 
	 
	 	By:  	/s/ Ardon E. Moore 	 
	 	 	Ardon E. Moore 	 
	 	 	President 	 
	 
	 	LITTLE HOSS COWTOWN PIPELINE PARTNERS

 	 
	 	By:  	AEM Ranch, L.L.C., managing partner
 	 
	 
	 	By:  	/s/ Ardon E. Moore 	 
	 	 	Ardon E. Moore 	 
	 	 	President 	 
	 
	 	LGS-GODLEY INVESTMENTS, LLC

 	 
	 	By:  	/s/ Charles L. Geren 	 
	 	 	Charles L. Geren 	 
	 	 	President 	 
	 

 

 

Schedule I

Cowtown Gas Processing Partners L.P. Ownership

	 	 	 	 	 
	Partners Name	 	Partner’s Sharing Percentage *	 	Units
	General Partner:
	 	 	 	 
	 
	 	 	 	 
	Cowtown Gas

	 	1%	 	N/A
	Processing L.P.
	 	 	 	 
	 
	 	 	 	 
	Limited Partners:
	 	 	 	 
	 
	 	 	 	 
	Cowtown Gas

	 	94%	 	475
	Processing L.P.
	 	 	 	 
	 
	 	 	 	 
	Little Hoss Cowtown

	 	5%	 	25
	Processing Partners
	 	 	 	 

Cowtown Pipeline Partners L.P. Ownership

	 	 	 	 	 
	Partners Name	 	Partner’s Sharing Percentage *	 	Units
	General Partner:
	 	 	 	 
	 
	 	 	 	 
	Cowtown

	 	1%	 	N/A
	Pipeline L.P.
	 	 	 	 
	 
	 	 	 	 
	Limited Partners:
	 	 	 	 
	 
	 	 	 	 
	Cowtown

	 	92%	 	465
	Pipeline L.P.
	 	 	 	 
	 
	 	 	 	 
	Little Hoss Cowtown

	 	5%	 	25
	Pipeline Partners
	 	 	 	 
	 
	 	 	 	 
	LGS-Godley

	 	2%	 	10
	Investments, LLC
	 	 	 	 

 

			
	*	 	Partner’s Sharing Percentage is determined as follows: (Units owned divided by total Units
outstanding) x 99%

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