Exhibit 10.15
 ADDENDUM AND AMENDMENT TO
GAS GATHERING AND PROCESSING AGREEMENT
MASH UNIT LATERAL




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  2




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To Section 17.1
 To Section 17.2
 PRODUCER AGREES THAT THE SCOPE OF PRODUCERS INDEMNITY OBLIGATION IN FAVOR OF GATHERER AND
PROCESSOR AND THEIR RESPECTIVE EMPLOYEES, AGENTS AND CONTRACTORS SET FORTH IN THIS SECTION 17.2
SHALL APPLY, EXTEND TO AND ENCOMPASS PRODUCERS OWNERSHIP, POSSESSION AND CONTROL OF THE LIFT GAS
AFTER THE LIFT GAS HAS PASSED THROUGH THE REDELIVERY POINT AND PRIOR TO THE TIME THAT GAS,
INCLUDING SUCH LIFT GAS, PASSES THROUGH THE GATHERING SYSTEM DELIVERY POINT
 GATHERER AGREES THAT THE SCOPE OF GATHERERS INDEMNITY OBLIGATION IN FAVOR OF PRODUCER AND
ITS EMPLYEES, AGENTS AND CONTRACTORS SET FORTH IN THIS SECTION 17.2 SHALL APPLY, EXTEND TO AND
EXCOMPASS GATHERERS POSSESSION AND CONTROL OF THE LIFT GAS FROM THE TIME SUCH LIFT GAS EXITS
GATHERERS OR PROCESSORS FACILITIES UNTIL SUCH LIFT GAS PASSES THROUGH THE REDELIVERY POINT
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PRODUCER:
    
    GATHERER:Quicksilver Resources Inc.
    
    Cowtown Pipeline Partners L.P.By:
    
    Quicksilver Gas Services Operating GPLLC, its general partnerBy:
    
    /s/ Stan G. Page
    
    By:
    
    /s/ Clifford RupnowName:
    
    Stan G. Page
    
    
    
    Name:
    
    Clifford RupnowTitle:
    
    V.P. U.S. Operations
    
    
    
    Title:
    
    VP Business Development and AdministrationPROCESSOR:Cowtown Gas Processing Partners L.P.By:
    
    Quicksilver Gas Services Operating GPLLC, its general partnerBy:
    
    /s/ Clifford RupnowName:
    
    Clifford RupnowTitle:
    
    VP Business Development and Administration
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EXHIBIT A
to
ADDENDUM AND AMENDMENT
MASH UNIT LATERAL
 
  Well Name
    
    Well IDHAWKEYE 1H
    
    
    42.1021.001HAWKEYE 2H
    
    
    42.1021.011HAWKEYE 3H
    
    
    42.1021.024HOT LIPS 1H
    
    
    42.1021.002HOT LIPS 2H
    
    
    42.1021.028HOT LIPS 3H
    
    
    42.1021.029MAJOR BURNS 1H
    
    
    42.1021.006MAJOR BURNS 2H
    
    
    42.1021.025TRAPPER JOHN 1H
    
    
    42.1021.004TRAPPER JOHN 2H
    
    
    42.1021.005TRAPPER JOHN 4H
    
    
    42.1021.023COLONEL FLAGG 1H
    
    
    42.1021.007COLONEL FLAGG 2H
    
    
    42.1021.008COLONEL FLAGG 3H
    
    
    42.1021.017
 5




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EXHIBIT B
to
ADDENDUM AND AMENDMENT
MASH UNIT LATERAL
 
 Redelivery PointsWell Name
    
    
    
    Well ID
    
    Injection #HAWKEYE 1H
    
    INJ
    
    
    42.1021.001
    
    
    TX 30993 INJHAWKEYE 2H
    
    INJ
    
    
    42.1021.011
    
    
    TX 31112 INJHAWKEYE 3H
    
    INJ
    
    
    42.1021.024
    
    
    TX 31462 INJHOT LIPS 1H
    
    INJ
    
    
    42.1021.002
    
    
    TX 30988 INJHOT LIPS 2H
    
    INJ
    
    
    42.1021.028
    
    
    TX 31588 INJHOT LIPS 3H
    
    INJ
    
    
    42.1021.029
    
    
    TX 31589 INJMAJOR BURNS 1H
    
    INJ
    
    
    42.1021.006
    
    
    TX 31007 INJMAJOR BURNS 2H
    
    INJ
    
    
    42.1021.025
    
    
    TX 31466 INJTRAPPER JOHN 1H
    
    INJ
    
    
    42.1021.004
    
    
    TX 30986 INJTRAPPER JOHN 2H
    
    INJ
    
    
    42.1021.005
    
    
    TX 30987 INJTRAPPER JOHN 4H
    
    INJ
    
    
    42.1021.023
    
    
    TX 31465 INJCOLONEL FLAGG 1H
    
    INJ
    
    
    42.1021.007
    
    
    TX 31020 INJCOLONEL FLAGG 2H
    
    INJ
    
    
    42.1021.008
    
    
    TX 31019 INJCOLONEL FLAGG 3H
    
    INJ
    
    
    42.1021.017
    
    
    TX 31463 INJ
 6