Plains
 Marketing,
L.P.
 10 Desta
Drive. Suite 200E | Midland, Texas 7870 | Phone: (432) 683-8622 | Fax: (432)
683-0849
 
 September
4, 2009
 
 Pioneer
Natural Resource USA
 5205 N
O'Connor Blvd., Suite 900
 Irving,
TX 75039
 Fax/email:
(972) 969 3574
 
 RE: PMLP
Contract: 2585-1013
 
 Effective
on and after September 1, 2009, please amend the subject contract by deleting
the "Price" clause and inserting the "Price" clause as follows:
 
 PRICE:
                  For
      the crude oil sold and delivered hereunder, PMLP agrees to pay a price per
      barrel which shall be calculated as
follows:
 
 a.
                  Determine
      arithmetic average of the daily settlement price for the "Light Sweet
      crude Oil" prompt month contract reported by the New York Mercantile
      Exchange (NYMEC) from the first day of the delivery month through the last
      day of the delivery month, including weekends and U.S. holidays with the
      previous day's settlement price applying to weekends and U.S.
      holidays.
 
 b.
                  To
      the number determined in the foregoing subparagraph (a.), add the
      arithmetic average of the daily settlement price for the crude contract
      reported by the NYMEX from the day the delivery month becomes the prompt
      trading month through the last day of the trading for the delivery month,
      market open quotes only, less the average of the daily settlement price
      for the second month NYMEX crude contract trading over the same period,
      times a percentage calculated from the number of days starting with the
      first day of the delivery month and ending with the day preceding the
      first trade day after the NYMEX crude contract expiration date during the
      delivery month, divided by the number of days in the delivery
      month.
 
 c.
                  To
      the number determined in the subparagraph (a. and b.) above, add the
      arithmetic average of the daily settlement price for the crude contract
      reported by the NYMEX from the day the delivery month becomes the prompt
      trading month through the last day of trading for the delivery month,
      market open quotes only, less the average of the daily settlement price
      for the third month NYMEX crude contract trading over the same period,
      times a percentage calculated from the number of days starting with first
      trade day after the NYMEX crude contract expiration date during the
      delivery month and ending with the last day of the delivery month, divided
      by the number of days in the delivery
month.
 
 d.
                  To
      the number determined in the foregoing subparagraph (c.) add the average
      of the daily high and low quotes for WTI (Midland) and subtract the
      average of the daily high and low quotes for WTI, (Cushing) for the month
      of delivery in Platt's Crude Oil
      Market Wire "America's Crude Oil Assessments" based on pricing
      assessed for the days the U.S. crude oil market is open (weekends and U.S.
      holidays excluded) during the period beginning with the 26th
      day of the month that is two (2) months prior to delivery through and
      including the 25th
      day of the month that is immediately prior to the month of delivery,
      provided, however, that if the first day of the period falls on a day
      which the U.S. crude oil market is closed, the period shall begin on the
      first trading day thereafter, and if the last day of the period falls on a
      day on which the U. S. crude oil market is closed, the period shall end on
      the last trading day prior thereto.
 
 e.
                  To
      the number determined in the forgoing subparagraph (d.), subtract the net
      of the following: (Sum of the Midland WTS differential minus Midland WTI
      Differential divided by 14). The number determined pursuant to this
      subparagraph (e.) and subparagraphs (a.), (b.), (c.) and (d.) shall be the
      base price per barrel of crude oil.
(X1585)
 
 f.
                  To
      the number determined pursuant to subparagraphs (a.) through (e.),
      subtract the amount indicated on Exhibit "A", attached
    hereto.
  
  Except as
herein amended, all other terms and conditions of said contract shall remain in
full force and effect.
 
 This
fax/email evidences our understanding of the entire agreement and shall
constitute the formal contract.
 
 Please
acknowledge by return fax/email your acceptance of the agreement to the terms
stated herein. If no response from the Counterparty is received within five (5)
business days, the contract is considered binding. These terms and conditions
will be deemed accepted if Pioneer Natural Resources Usa begins performance of
its obligations hereunder.
 
 The
parties agree that faxed/emailed documents shall be deemed to be admissible as
primary evidence in a court of law as original or as counterparts of the
original documents, either of which is to be retained an available for
inspection.
 
 Very
truly yours,
 
 PLAINS
      MARKETING, L.P.By
      Plains Marketing GP Inc.Its
      General Partner/s/
      Mike A. Weller
                  /s/
      Hershal K. WolfeMike
      A. Weller
                  Hershal
      K. WolfeSenior
      crude Oil Representative
                  Vice
      President Marketing
  
 
 Exhibit
"A"
 
 Sep 04,
2009
 Page 1 of
13
 
 Plains
      Contract:
                
                2582-1013
                
                Effective:
      09-01-2009
                
                Plains
      Marketing L.P.
 PM
                      Lease
                      ‡=inact
                    
                    
                    
                    Lease
                    
                    Operator
                    
                    County/Parrish
                    
                    
                    
                    Price
                    
                    Price
                      Method
                    
                    Applicable
                      Premium
                      Or
                      (Deduct)
                    
                    Fuel
                      Adjustment
                    
                    Percent
                    
                    Gravity
                    
                    State
                      Lease139893
                    
                    
                    
                    T L
      WALLACE
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      DAWSON
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    016168128758
                    
                    
                    
                    ATKINSON,
      W.B. C
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    014077128749
                    
                    
                    
                    BIGBY
      WA B
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    008044128750
                    
                    
                    
                    BRYANS
      & COX
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    0856128760
                    
                    
                    
                    BRYANS
      M.V. A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5338128759
      ‡
                    
                    
                    
                    COX
      X.B. B
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    014091142207
                    
                    (20)
                    
                    DAVENPORT
      RS "B" 5, 11,13,17
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    0861142206
                    
                    (20)
                    
                    DAVENPORT
      RS -A- 15
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    0861128751
                    
                    (20)
                    
                    DAVENPORT
      RS A 2,6,9
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    0861059989
                    
                    
                    
                    F A
      WILDE
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5137128757
      ‡
                    
                    
                    
                    REYNOLDS
      CC
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    014076054118
                    
                    
                    
                    SDU
      133A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059688
                    
                    
                    
                    SDU
      135A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059689
                    
                    
                    
                    SDU
      136A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054076
                    
                    
                    
                    SDU
      156A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059750
                    
                    
                    
                    SDU
      167A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054272
                    
                    
                    
                    SDU
      170A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059764
                    
                    
                    
                    SDU
      TR 64-A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054183
                    
                    
                    
                    SDU
      TRACT 107 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128547
                    
                    
                    
                    SDU
      TRACT 108 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128906
                    
                    
                    
                    SDU
      TRACT 109 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400055364
                    
                    
                    
                    SDU
      TRACT 110
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059988
                    
                    
                    
                    SDU
      TRACT 110 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128561
                    
                    
                    
                    SDU
      TRACT 111 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128545
                    
                    
                    
                    SDU
      TRACT 112 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054189
                    
                    
                    
                    SDU
      TRACT 132 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054186
                    
                    
                    
                    SDU
      TRACT 134 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128559
                    
                    
                    
                    SDU
      TRACT 137 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400055365
                    
                    
                    
                    SDU
      TRACT 138 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128930
                    
                    
                    
                    SDU
      TRACT 139 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400
 
 Exhibit
"A"
 
 Sep 04,
2009
 Page 2 of
13
 
 Plains
      Contract:
                    
                    2582-1013
                    
                    Effective:
      09-01-2009
                    
                    Plains
      Marketing L.P.
 PM
                      Lease
                      ‡=inact
                    
                    
                    
                    Lease
                    
                    Operator
                    
                    County/Parrish
                    
                    
                    
                    Price
                    
                    Price
                      Method
                    
                    Applicable
                      Premium
                      Or
                      (Deduct)
                    
                    Fuel
                      Adjustment
                    
                    Percent
                    
                    Gravity
                    
                    State
                      Lease128554
                    
                    
                    
                    SDU
      TRACT 140 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128557
                    
                    
                    
                    SDU
      TRACT 141 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128553
                    
                    
                    
                    SDU
      TRACT 142 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128566
                    
                    
                    
                    SDU
      TRACT 142 B
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400055136
                    
                    
                    
                    SDU
      TRACT 144 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054188
                    
                    
                    
                    SDU
      TRACT 157 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128555
                    
                    
                    
                    SDU
      TRACT 166 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128558
                    
                    
                    
                    SDU
      TRACT 168 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128551
                    
                    
                    
                    SDU
      TRACT 169 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128552
                    
                    
                    
                    SDU
      TRACT 181 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128560
                    
                    
                    
                    SDU
      TRACT 186 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054185
                    
                    
                    
                    SDU
      TRACT 197 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054190
                    
                    
                    
                    SDU
      TRACT 198 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054177
                    
                    
                    
                    SDU
      TRACT 19 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128567
                    
                    
                    
                    SDU
      TRACT 212 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128569
                    
                    
                    
                    SDU
      TRACT 213 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400052718
                    
                    
                    
                    SDU
      TRACT 23 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128907
                    
                    
                    
                    SDU
      TRACT 38 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128548
                    
                    
                    
                    SDU
      TRACT 39 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128908
                    
                    
                    
                    SDU
      TRACT 39 B
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054176
                    
                    
                    
                    SDU
      TRACT 44 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054180
                    
                    
                    
                    SDU
      TRACT 45 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128573
                    
                    
                    
                    SDU
      TRACT 56 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128909
                    
                    
                    
                    SDU
      TRACT 58
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128570
                    
                    
                    
                    SDU
      TRACT 58 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128549
                    
                    
                    
                    SDU
      TRACT 59 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128544
                    
                    
                    
                    SDU
      TRACT 61 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128565
                    
                    
                    
                    SDU
      TRACT 73 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128564
                    
                    
                    
                    SDU
      TRACT 74 B
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128572
                    
                    
                    
                    SDU
      TRACT 75 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400
  
 Exhibit
"A"
 
 Sep 04,
2009
 Page 3
of 13
 
 Plains
      Contract:
                      
                      2582-1013
                      
                      Effective:
      09-01-2009
                      
                      Plains
      Marketing L.P.
 PM
                      Lease
                      ‡=inact
                    
                    
                    
                    Lease
                    
                    Operator
                    
                    County/Parrish
                    
                    
                    
                    Price
                    
                    Price
                      Method
                    
                    Applicable

                      Premium
                      Or
                      (Deduct)
                    
                    Fuel
                      Adjustment
                    
                    Percent
                    
                    Gravity
                    
                    State
                      Lease128571
                    
                    
                    
                    SDU
      TRACT 76 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059554
                    
                    
                    
                    SDU
      TRACT 77 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054184
                    
                    
                    
                    SDU
      TRACT 78 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400059555
                    
                    
                    
                    SDU
      TRACT 80 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128546
                    
                    
                    
                    SDU
      TRACT 81 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128550
                    
                    
                    
                    SDU
      TRACT 82 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054181
                    
                    
                    
                    SDU
      TRACT 85-A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054284
                    
                    
                    
                    SDU
      TRACT 86 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400054182
                    
                    
                    
                    SDU
      TRACT 88 A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.9000)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128563
                    
                    
                    
                    SDU
      TRACT 894
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128748
                    
                    
                    
                    SPRABERRY
      DRIVER UNIT
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    015400128752
                    
                    
                    
                    WILLIAMS,
      E.P. A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      GLASSCOCK
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    014097094152
                    
                    (19)
                    
                    ASHLEY
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5852094153
      ‡
                    
                    
                    
                    CALLAWAY
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    021950076720
                    
                    
                    
                    CASTLE
      1 X
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    027052084944
                    
                    (13)
                    
                    CLARENCE
      #1
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602549401
                    
                    (9)
                    
                    CURTIS
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605004171
                    
                    (9)
                    
                    CURTIS
      "B"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605004247
                    
                    
                    
                    CURTIS
      "C"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5287004172
                    
                    
                    
                    CURTIS
      "D"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    032934004525
                    
                    (12)
                    
                    CURTIS
      "E"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198004283
                    
                    (9)
                    
                    CURTIS
      "H"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605004392
                    
                    (9)
                    
                    CURTIS
      "K"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605074968
                    
                    (13)
                    
                    CURTIS
      "P"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602076978
                    
                    (13)
                    
                    CURTIS
      "R"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602078429
                    
                    (13)
                    
                    CURTIS
      "U"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602078400
                    
                    (13)
                    
                    CURTIS
      "W"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602004088
                    
                    (9)
                    
                    CURTIS
      "A"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605135131
                    
                    (12)
                    
                    CURTIS
      F #2
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198004282
                    
                    (9)
                    
                    CURTIS
      G
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605
  
 Exhibit
"A"
 
 Sep 04,
2009
 Page 4
of 13
 
 Plains
      Contract:
                      
                      2582-1013
                      
                      Effective:
      09-01-2009
                      
                      Plains
      Marketing L.P.
 PM
                      Lease
                      ‡=inact
                    
                    
                    
                    Lease
                    
                    Operator
                    
                    County/Parrish
                    
                    
                    
                    Price
                    
                    Price
                      Method
                    
                    Applicable

                      Premium
                      Or
                      (Deduct)
                    
                    Fuel
                      Adjustment
                    
                    Percent
                    
                    Gravity
                    
                    State
                      Lease004528
                    
                    (12)
                    
                    CURTIS
      I
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198112604
                    
                    (12)
                    
                    CURTIS
      J
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198549980
                    
                    (9)
                    
                    CURTIS
      L
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605550021
                    
                    (12)
                    
                    CURTIS
      M
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198112608
                    
                    (12)
                    
                    CURTIS
      N
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198114710
                    
                    (9)
                    
                    CURTIS
      O
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605012906
                    
                    (9)
                    
                    CURTIS
      Q
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605077408
                    
                    (13)
                    
                    CURTIS
      S
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602550513
                    
                    (9)
                    
                    CURTIS
      T
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605550548
                    
                    (9)
                    
                    CURTIS
      V
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605059998
                    
                    (13)
                    
                    CURTIS
      X
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5602096203
                    
                    (15)
                    
                    DICKENSON-C-#13
      & 14
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    021525123002
                    
                    (15)
                    
                    DICKENSON-C-#15
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    021525003363
                    
                    (11)
                    
                    DOVE
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5604004522
                    
                    (12)
                    
                    DOVE
      "Z"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    7198095854
                    
                    (11)
                    
                    DOVE
      "B"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5604095855
                    
                    (11)
                    
                    DOVE
      "C"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5604095856
                    
                    
                    
                    DOVE
      "G"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    032497093966
                    
                    (9)
                    
                    DOVE
      "U"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605004158
                    
                    (11)
                    
                    DOVE
      "W"
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5604095950
                    
                    (9)
                    
                    DOVE
      A
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605095935
                    
                    (10)
                    
                    DOVE
      D
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5929095936
                    
                    
                    
                    DOVE
      E #1 & #2
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    032462096076
                    
                    
                    
                    DOVE
      H
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    032528096077
                    
                    (9)
                    
                    DOVE
      I
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605096078
                    
                    (9)
                    
                    DOVE
      J
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605059620
                    
                    (9)
                    
                    DOVE
      J #2
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605003160
                    
                    (9)
                    
                    DOVE
      K
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605549338
                    
                    (9)
                    
                    DOVE
      L
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605096079
                    
                    (9)
                    
                    DOVE
      M
                    
                    PIONEER
      NATURAL RES
                    
                    IN
      MARTIN
                    
                    TX
                    
                    X1585
                    
                    EDQ
                    
                    ($0.5500)
                    
                    $0.0000
                    
                    100.00000%
                    
                    Flat
                    
                    5605
  
 
 Exhibit
"A"
 
 Sep 04,
2009
 Page 5
of 13
 
 Plains
      Contract:
                        
                        2582-1013
                        
                        Effective:
      09-01-2009
                        
                        Plains
      Marketing L.P.
 PM
                          Lease
                          ‡=inact
                      
                      
                      
                      Lease
                      
                      Operator
                      
                      County/Parish
                      
                      
                      
                      Price
                      
                      Price
      Method
                      
                      Applicable
                        Premium
                        Or
                        (Deduct)
                      
                      Fuel
                        Adjust
                      
                      Percent
                      
                      Gravity
                      
                      State
                        Lease142124
                      
                      (9)
                      
                      DOVE
      M #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5605549680
                      
                      (9)
                      
                      DOVE
      N
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5605004523
                      
                      (12)
                      
                      DOVE
      -O-
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      7198096080
                      
                      (9)
                      
                      DOVE
      P
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5605096378
                      
                      (11)
                      
                      DOVE
      Q
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5604003568
                      
                      (11)
                      
                      DOVE
      R
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5604003698
                      
                      (9)
                      
                      DOVE
      S
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      60.00000%
                      
                      Flat
                      
                      5605003699
                      
                      (9)
                      
                      DOVE
      T
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      40.00000%
                      
                      Flat
                      
                      5605112907
                      
                      (9)
                      
                      DOVE
      V #1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5605139945
                      
                      (9)
                      
                      DOVE
      V #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      032922549717
                      
                      (9)
                      
                      DOVE
      Y
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5605055503
                      
                      
                      
                      ELMA
      L SLAUGHTER
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020227055504
                      
                      (18)
                      
                      ELMA
      L SLAUGHTER B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      49.00000%
                      
                      Flat
                      
                      020227130254
                      
                      (18)
                      
                      ELMA
      L SLAUGHTER B#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      51.00000%
                      
                      Flat
                      
                      020277055506
                      
                      
                      
                      ELMA
      L SLAUGHTER C
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020332055508
                      
                      
                      
                      ELMA
      L SLAUGHTER E
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020464055511
                      
                      
                      
                      ELMA
      L SLAUGHTER H
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020919055513
                      
                      
                      
                      ELMA
      L SLAUGHTER J
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020955055510
                      
                      
                      
                      ELMA
      L SLAUGHTER G #1-3
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020911071171
                      
                      
                      
                      ELMA
      L SLAUGHTER G#2-4
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      020911094154‡
                      
                      
                      
                      FOREMAN
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021725094156
                      
                      
                      
                      FRAZIER
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      022003548277
                      
                      (17)
                      
                      GLASS
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826094157
                      
                      
                      
                      GLASS
      7
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      022448548278
                      
                      (17)
                      
                      GLASS
      A
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548279
                      
                      (17)
                      
                      GLASS
      B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826552194
                      
                      (17)
                      
                      GLASS
      �B� #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548287
                      
                      (17)
                      
                      GLASS
      C #1 & #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130123
                      
                      (17)
                      
                      GLASS
      D #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548299
                      
                      (17)
                      
                      GLASS
      D#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826
  
 
 Exhibit
"A"
 
 Sep 04,
2009
 Page 6
of 13
 
 Plains
      Contract:
                        
                        2582-1013
                        
                        Effective:
      09-01-2009
                        
                        Plains
      Marketing L.P.
 PM
                          Lease
                          ‡=inact
                      
                      
                      
                      Lease
                      
                      Operator
                      
                      County/Parish
                      
                      
                      
                      Price
                      
                      Price
      Method
                      
                      Applicable
                        Premium
                        Or
                        (Deduct)
                      
                      Fuel
                        Adjust
                      
                      Percent
                      
                      Gravity
                      
                      State
                        Lease120706
                      
                      (17)
                      
                      GLASS
      DD
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      037854548334
                      
                      (17)
                      
                      GLASS
      E
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826120708
                      
                      (17)
                      
                      GLASS
      FF
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548469
                      
                      (17)
                      
                      GLASS
      H
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826120710
                      
                      (17)
                      
                      GLASS
      HH
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548470
                      
                      (17)
                      
                      GLASS
      I
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826120711
                      
                      (17)
                      
                      GLASS
      II
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130288
                      
                      (17)
                      
                      GLASS
      J
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130291
                      
                      (17)
                      
                      GLASS
      K
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130293
                      
                      (17)
                      
                      GLASS
      L
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130292
                      
                      (17)
                      
                      GLASS
      M
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130290
                      
                      (17)
                      
                      GLASS
      N
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130294
                      
                      (17)
                      
                      GLASS
      O
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130295
                      
                      (17)
                      
                      GLASS
      T
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826548719
                      
                      (17)
                      
                      GLASS
      Y
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826130289
                      
                      (17)
                      
                      GLASS
      V
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826114777
                      
                      (17)
                      
                      GLASS
      W
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826154028
                      
                      (17)
                      
                      GLASS
      W#3
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826148754
                      
                      (17)
                      
                      GLASS
      Y
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826096221
                      
                      
                      
                      GLEN
      COX
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021702549337
                      
                      (14)
                      
                      GUY
      B#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857114774
                      
                      (14)
                      
                      GUY
      C#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549384
                      
                      (14)
                      
                      GUY
      D#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857114770
                      
                      (14)
                      
                      GUY
      D#2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549466
                      
                      (14)
                      
                      GUY
      E#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857114771
                      
                      (14)
                      
                      GUY
      E#2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549395
                      
                      (14)
                      
                      GUY
      F
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      032868549396
                      
                      (14)
                      
                      GUY
      G
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549397
                      
                      (14)
                      
                      GUY
      H
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857130014
                      
                      (14)
                      
                      GUY
      H#2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      032857
  
  Exhibit
"A"
 
 Sep 04,
2009
 Page 7
of 13
 
 Plains
      Contract:
                          
                          2582-1013
                          
                          Effective:
      09-01-2009
                          
                          Plains
      Marketing L.P.
 PM
                          Lease
                          ‡=inact
                      
                      
                      
                      Lease
                      
                      Operator
                      
                      County/Parish
                      
                      
                      
                      Price
                      
                      Price
      Method
                      
                      Applicable
                        Premium
                        Or
                        (Deduct)
                      
                      Fuel
                        Adjust
                      
                      Percent
                      
                      Gravity
                      
                      State
                        Lease549398
                      
                      (14)
                      
                      GUY
      I
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549399
                      
                      (14)
                      
                      GUY
      J
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549831
                      
                      (14)
                      
                      GUY
      K#1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549681
                      
                      (14)
                      
                      GUY
      L
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549706
                      
                      (14)
                      
                      GUY
      M
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549933
                      
                      (14)
                      
                      GUY
      O
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549714
                      
                      (14)
                      
                      GUY
      P
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549911
                      
                      (14)
                      
                      GUY
      Q
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549801
                      
                      (14)
                      
                      GUY
      R
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549836
                      
                      (14)
                      
                      GUY
      S
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857548950
                      
                      (14)
                      
                      GUY
      V
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549700
                      
                      (14)
                      
                      GUY
      W
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549934
                      
                      (14)
                      
                      GUY
      X
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549978
                      
                      (14)
                      
                      GUY
      Y
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549983
                      
                      (14)
                      
                      GUY
      Z
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857070367‡
                      
                      
                      
                      HALE
      -B-
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021130094158
                      
                      
                      
                      HAMM
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021764094160
                      
                      
                      
                      HOWELL
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021911166076
                      
                      
                      
                      INEZ
      WOODY 2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021682142021
                      
                      (16)
                      
                      INEZ
      WOODY B#2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858154060
                      
                      (16)
                      
                      INEZ
      WOODY B#3
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858139875
                      
                      (16)
                      
                      INEZ
      WOODY C#3
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858142023
                      
                      (16)
                      
                      INEZ
      WOODY C#4
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858142401
                      
                      (16)
                      
                      INEZ
      WOODY C#6
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858154024
                      
                      (16)
                      
                      INEZ
      WOODY C#6
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5858000110
                      
                      
                      
                      JC
      SALE
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021322001312
                      
                      
                      
                      JN
      WOODY JR
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021761097340‡
                      
                      
                      
                      KEATON
      B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      217765094161
                      
                      
                      
                      KELLY
      A
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021685001142‡
                      
                      
                      
                      KEWANEE
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021797
  
  Exhibit
"A"
 
 Sep 04,
2009
 Page 8
of 13
 
 Plains
      Contract:
                          
                          2582-1013
                          
                          Effective:
      09-01-2009
                          
                          Plains
      Marketing L.P.
 PM
                          Lease
                          ‡=inact
                      
                      
                      
                      Lease
                      
                      Operator
                      
                      County/Parish
                      
                      
                      
                      Price
                      
                      Price
      Method
                      
                      Applicable
                        Premium
                        Or
                        (Deduct)
                      
                      Fuel
                        Adjust
                      
                      Percent
                      
                      Gravity
                      
                      State
                        Lease094162�
                      
                      
                      
                      KNOX
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021759093699
                      
                      (19)
                      
                      LEONARD
      A
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6852049490
                      
                      (14)
                      
                      LOTTIE
      �A�
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857135342
                      
                      (14)
                      
                      LOTTIE
      "A" #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857004503
                      
                      (14)
                      
                      LOTTIE
      "G"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549995
                      
                      (14)
                      
                      LOTTIE
      B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549951
                      
                      (14)
                      
                      LOTTIE
      C
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857550028
                      
                      (14)
                      
                      LOTTIE
      D
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857549976
                      
                      (14)
                      
                      LOTTIE
      E
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857550303
                      
                      (14)
                      
                      LOTTIE
      H #1
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857114773
                      
                      (14)
                      
                      LOTTIE
      H #2
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857094573
                      
                      (14)
                      
                      MABEE
      "P"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857096831
                      
                      (14)
                      
                      MABEE
      J#13
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857096907‡
                      
                      (1)
                      
                      MABEE
      K
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      74.60938%
                      
                      Flat
                      
                      7567548721
                      
                      (14)
                      
                      MABEE
      O
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857548724
                      
                      (14)
                      
                      MABEE
      Q
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857547923
                      
                      (14)
                      
                      MABEE
      V
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857547914
                      
                      (14)
                      
                      MABEE
      W
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      6857094136‡
                      
                      
                      
                      MADISON
      B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021510094155
                      
                      
                      
                      MAYME
      FOREMAN
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021685000029‡
                      
                      
                      
                      MCREYNOLDS
      "B"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      022741094164
                      
                      
                      
                      MEEK
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      021979073269‡
                      
                      
                      
                      MORRISON
      "A"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      026023549431
                      
                      (17)
                      
                      QUAIL
      A
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826549410
                      
                      (17)
                      
                      QUAIL
      B
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5826073902
                      
                      
                      
                      QUATTLEBAUM
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      026427094273
                      
                      (11)
                      
                      SCHARBAUER
      "F"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5604094456
                      
                      (10)
                      
                      SCHARBAUER
      "N"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5829002933
                      
                      (10)
                      
                      SCHARBAUER
      "O"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      5829094508
                      
                      
                      
                      SCHARBAUER
      "P"
                      
                      PIONEER
      NATURAL RES USA IN
                      
                      MARTIN
                      
                      TX
                      
                      X1585
                      
                      EDQ
                      
                      ($0.5500)
                      
                      $0.0000
                      
                      100.00000%
                      
                      Flat
                      
                      032086
  
 Exhibit
"A"
 
 Sep 04,
2009
 Page 9 of
13
 
 Plains
      contract:
              
              2582-1013
              
              Effective:
      09-01-2009
              
              Plains
      Marketing L.P.
 
 
 PM
                    Lease
                    ‡=inact
              
              
              
              Lease
              
              Operator
              
              County/Parish
              
              
              
              Price
              
              Price
                Method
              
              Applicable
                Premium
                or
                (Deduct)
              
              Fuel
                Adjust
              
              Percent
              
              Gravity
              
              State
                Lease094822
              
              (9)
              
              SCHARBAUER
      "U"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605094823
              
              (11)
              
              SCHARBAUER
      "V"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5604098890‡
              
              
              
              SCHARBAUER
      -C-
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              022641112602
              
              (10)
              
              SCHARBAUER
      C #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5929112805
              
              (9)
              
              SCHARBAUER
      E
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605094305
              
              (9)
              
              SCHARBAUER
      G
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605092906
              
              (9)
              
              SCHARBAUER
      K
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605094501
              
              (9)
              
              SCHARBAUER
      L
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605010570
              
              (9)
              
              SCHARBAUER
      L #2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605059618
              
              (9)
              
              SCHARBAUER
      P #3
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605094836
              
              (9)
              
              SCHARBAUER
      R #1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605167897
              
              (13)
              
              SCHARBAUER
      RANCH #33
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602167712
              
              (13)
              
              SCHARBAUER
      RANCH #73
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              037534130034
              
              (9)
              
              SCHARBAUER
      RANCH 31
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605135042
              
              (9)
              
              SCHARBAUER
      RANCH 32
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605135043
              
              (13)
              
              SCHARBAUER
      RANCH 34
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602142067
              
              (13)
              
              SCHARBAUER
      RANCH 36
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602126768
              
              (13)
              
              SCHARBAUER
      RANCH 42
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602114265
              
              (13)
              
              SCHARBAUER
      RANCH 44
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602130455
              
              (13)
              
              SCHARBAUER
      RANCH 45
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602156283
              
              (13)
              
              SCHARBAUER
      RANCH 47
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602135397
              
              (13)
              
              SCHARBAUER
      RANCH 53
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602142172
              
              (13)
              
              SCHARBAUER
      RANCH 55
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602130251
              
              (13)
              
              SCHARBAUER
      RANCH 60
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602142463
              
              (13)
              
              SCHARBAUER
      RANCH 64
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602135138
              
              (13)
              
              SCHARBAUER
      RANCH 68
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602154059
              
              (13)
              
              SCHARBAUER
      RANCH 74
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602135087
              
              (13)
              
              SCHARBAUER
      RANCH 75
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602142173
              
              (13)
              
              SCHARBAUER
      RANCH A #1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5602167639
              
              (13)
              
              SCHARBAUER
      RANCH A #2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              038227
  
  Exhibit
"A"
 
 Sep 04,
2009
 Page 10
of 13
 
 Plains
      contract:
              
              2582-1013
              
              Effective:
      09-01-2009
              
              Plains
      Marketing L.P.
 
 PM
                    Lease
                    ‡=inact
              
              
              
              Lease
              
              Operator
              
              County/Parish
              
              
              
              Price
              
              Price
                Method
              
              Applicable
                Premium
                or
                (Deduct)
              
              Fuel
                Adjust
              
              Percent
              
              Gravity
              
              State
                Lease142318
              
              (12)
              
              SCHARBAUER
      RANCH A-4
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              7198154262
              
              (12)
              
              SCHARBAUER
      RANCH A-6
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              7198142068
              
              (12)
              
              SCHARBAUER
      RANCH A-7
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              7198158284
              
              (12)
              
              SCHARBAUER
      RANCH A-8
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              7198154151
              
              (12)
              
              SCHARBAUER
      RANCH A-9
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              7198064324
              
              (9)
              
              SCHARBAUER
      T #1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605065255
              
              (11)
              
              SCHARBAUER
      X#1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5604064310
              
              (11)
              
              SCHARBAUER
      X#2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5604085912‡
              
              
              
              SCHARBAUER
      -Y-
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              032475096081
              
              (9)
              
              SCHARBAUER
      Z #1 
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605059621
              
              (9)
              
              SCHARBAUER
      Z #3
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605064327
              
              (9)
              
              SCHARBAUER
      Z #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5605548534
              
              (17)
              
              SCHENECKER
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              6826548611
              
              (17)
              
              SCHENECKER
      A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5826093242
              
              
              
              STEWART
      "A"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              030394001973
              
              
              
              STEWART
      B
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              022026094165
              
              
              
              WEBB
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021708097677
              
              (3)
              
              WELCH
      & WELCH
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021859007678
              
              (3)
              
              WELCH
      & WELCH #2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021859090009
              
              (2)
              
              WELCH
      G #3
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021567097672
              
              (2)
              
              WELCH
      G #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021667-094151
              
              
              
              WILLIAMS
      "B"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021768094169
              
              
              
              WILLIAMS
      "D"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              022049090010‡
              
              
              
              WINCHESTER
      #1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021687001096
              
              
              
              WOODY
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021688077196
              
              (16)
              
              WOODY
      J#1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5658128516
              
              (16)
              
              WOODY
      J#2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5856001873
              
              
              
              WOODY-E-
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021970096250
              
              
              
              WOOOY-H-
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              021889077210
              
              (16)
              
              WOODY
      -1-WELL #3
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5858
  
  Exhibit
"A"
 
 Sep 04,
2009
 Page 11
of 13
 
 Plains
      contract:
              
              2582-1013
              
              Effective:
      09-01-2009
              
              Plains
      Marketing L.P.
 
 PM
                    Lease
                    ‡=inact
              
              
              
              Lease
              
              Operator
              
              County/Parish
              
              
              
              Price
              
              Price
                Method
              
              Applicable
                Premium
                or
                (Deduct)
              
              Fuel
                Adjust
              
              Percent
              
              Gravity
              
              State
                Lease077481
              
              (16)
              
              WOODY
      K#1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5858128517
              
              (16)
              
              WOODY
      K#2
              
              PIONEER
      NATURAL RES
              
              USA
      IN MARTIN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5858014148‡
              
              
              
              FLOYD
      "A"
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              006610106957
              
              (8)
              
              MCCLINTIC
      59-1
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4479097583
              
              (4)
              
              MCCLINTIC
      D
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4419055935
              
              (8)
              
              MCCLINTIC
      E
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4479064598
              
              (22)
              
              MCCLINTIC
      E
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5030064600
              
              (22)
              
              MCCLINTIC
      E NCT #30 #53
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5030064599
              
              (22)
              
              MCCLINTIC
      F
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              5030064321
              
              (8)
              
              MCCLINTIC
      G
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4479064316
              
              (4)
              
              MCCLINTIC
      H
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4419064322
              
              (8)
              
              MCCLINTIC
      J
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              4479054116
              
              
              
              MCCLINTIC
      L
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              034621054099
              
              
              
              MCCLINTIC
      M #54
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              034738063255
              
              
              
              MIDKIFF
      TRACT 6
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015254553435
              
              
              
              S
      DRIVER U TR 51A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400554233
              
              
              
              S
      DRIVER UT TR 52B
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400553232
              
              
              
              S
      DRIVER UT TR 890
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400054491
              
              
              
              SDU
      27A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.9000)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400554422
              
              
              
              SDU
      48A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.9000)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400554430
              
              
              
              SOU
      50A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.9000)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400554404
              
              
              
              SDU
      53A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400554475
              
              
              
              SDU
      55A
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.9000)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              015400064317‡
              
              
              
              TURNER
      J
              
              PIONEER
      NATURAL RES
              
              USA
      IN MIDLAND
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              033428128754
              
              
              
              ATKINSON
      B & WHITEHOUSE"
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              6441128753
              
              
              
              ATKINSON,
      W.B. A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              014074128755
              
              
              
              CAUBLE,
      E.G. K
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              014070128758
              
              
              
              CAUBLE,
      E.G. L
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              014071059834
              
              
              
              MERCHANT
      39-S
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426059660
              
              
              
              MERCHANT
      46S
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426
  
  Exhibit
"A"
 
 Sep 04,
2009
 Page 12
of 13
 
 Plains
      contract:
              
              2582-1013
              
              Effective:
      09-01-2009
              
              Plains
      Marketing L.P.
 
 PM
                    Lease
                    ‡=inact
              
              
              
              Lease
              
              Operator
              
              County/Parish
              
              
              
              Price
              
              Price
                Method
              
              Applicable
                Premium
                or
                (Deduct)
              
              Fuel
                Adjust
              
              Percent
              
              Gravity
              
              State
                Lease059661
              
              
              
              MERCHANT
      47S
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426055425
              
              
              
              MERCHANT
      5502N
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426052821
              
              
              
              MERCHANT
      TR 4404A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426054022
              
              
              
              MERCHANT
      TR 53K
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426098176
              
              
              
              MERCHANT
      UNIT
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426055467
              
              
              
              MERCHANT
      UNIT TR 3702 N
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426059645
              
              
              
              MERCHANT
      UT 40-S
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426052797
              
              
              
              MERCHANT
      UT TR #3803A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426052796
              
              
              
              MERCHANT
      UT TR #5104A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426052802
              
              
              
              MERCHANT
      UT TR#5202A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426052803
              
              
              
              MERCHANT
      UT TR #6207A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426059542
              
              
              
              MERCHANTS
      63S
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426062771
              
              
              
              MERCHANTS
      6403-A
              
              PIONEER
      NATURAL RES
              
              USA
      IN REAGAN
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004426092782‡
              
              
              
              CONNELL
      #1 & #2
              
              PIONEER
      NATURAL RESOURCE
              
              UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              144253097748
              
              
              
              CONNELL
      B #1, #3, #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004414097752
              
              
              
              COWDEN
      B
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004382076667
              
              (6)
              
              HIRSCH
      E #1
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004223064315
              
              (6)
              
              HIRSCH
      E #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004223064323
              
              (7)
              
              HIRSCH
      F #2, 5 & 6
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004254076668
              
              (7)
              
              HIRSCH
      F #4
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004254119109
              
              (7)
              
              HIRSCH
      F 10
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004254119107
              
              (7)
              
              HIRSCH
      F 8
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004254119108
              
              (7)
              
              HIRSCH
      F 9
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004254064319
              
              
              
              LINK
      #8
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              004039097630
              
              
              
              N
      PEMBROOK SPRA UNIT #79
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913059800
              
              
              
              NPSU
      TRACT 28 A
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913059616
              
              
              
              NPSU
      TRACT 54A
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913059617
              
              
              
              NPSU
      TRACT 55A
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913059615
              
              
              
              NPSU
      TRACT 57A
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913059612
              
              
              
              NPSU
      TRACT 74A
              
              PIONEER
      NATURAL RES
              
              USA
      IN UPTON
              
              TX
              
              X1585
              
              EDQ
              
              ($0.5500)
              
              $0.0000
              
              100.00000%
              
              Flat
              
              003913








Exhibit
"A"
 
 Sep 04,
2009
 Page 13
of 13
 
 Plains
      contract:
              
              2582-1013
              
              Effective:
      09-01-2009
              
              Plains
      Marketing L.P.


PM
                  Lease
                  ‡=inact
            
            
            
            Lease
            
            Operator
            
            County/Parish
            
            
            
            Price
            
            Price
      Method
            
            Applicable
              Premium
              Or
              (Deduct)
            
            Fuel
              Adjust
            
            Percent
            
            Gravity
            
            State
              Lease059613
            
            
            
            NPSU
      TRACT 75A
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003913059614
            
            
            
            MPSU
      TRACT 79A
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003913064447
            
            (21)
            
            PEMBROOK
      UNIT TR 1
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            4.86624
            
            Flat
            
            5497064449
            
            (21)
            
            PEMBROOK
      UNIT TR 11
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            9.73248
            
            Flat
            
            5497064450
            
            (21)
            
            PEMBROOK
      UNIT TR 12
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            9.73248
            
            Flat
            
            5497064448
            
            (21)
            
            PEMBROOK
      UNIT TR 2
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            9.73248
            
            Flat
            
            5497064451
            
            (21)
            
            PEMBROOK
      UNIT TR 22
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            4.86624
            
            Flat
            
            5497064452
            
            (21)
            
            PEMBROOK
      UNIT TR 28
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            4.86624
            
            Flat
            
            5497064453
            
            (21)
            
            PEMBROOK
      UNIT TR 29
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            4.86624
            
            Flat
            
            5497064454
            
            (21)
            
            PEMBROOK
      UNIT TR 30
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            7.29936
            
            Flat
            
            5497064455
            
            (21)
            
            PEMBROOK
      UNIT TR 31
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            2.43312
            
            Flat
            
            5497064456
            
            (21)
            
            PEMBROOK
      UNIT TR 33
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            2.43491
            
            Flat
            
            5497064457
            
            (21)
            
            PEMBROOK
      UNIT TR 34
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            2.43312
            
            Flat
            
            5497064458
            
            (21)
            
            PEMBROOK
      UNIT TR 36
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            .24027
            
            Flat
            
            5497064459
            
            (21)
            
            PEMBROOK
      UNIT TR 59
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            9.73248
            
            Flat
            
            5497064460
            
            (21)
            
            PEMBROOK
      UNIT TR 60
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            1.21656
            
            Flat
            
            5497064461
            
            (21)
            
            PEMBROOK
      UNIT TR 63
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            3.64968
            
            Flat
            
            5497064465
            
            (21)
            
            PEMBROOK
      UNIT TR 64
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            9.73248
            
            Flat
            
            5497064462
            
            (21)
            
            PEMBROOK
      UNIT TR 72
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            4.86624
            
            Flat
            
            5497064463
            
            (21)
            
            PEMBROOK
      UNIT TR 77
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            7.29936%
            
            Flat
            
            5497007395
            
            (5)
            
            WINDHAM
      T #1 & 2
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003901064314
            
            (5)
            
            WINDHAM
      T #3
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003901119105
            
            (5)
            
            WINDHAM
      T 4
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003901119106
            
            (5)
            
            WINDHAM
      T 5
            
            PIONEER
      NATURAL RES USA IN
            
            UPTON
            
            TX
            
            X1585
            
            EDQ
            
            ($0.5500)
            
            $0.0000
            
            100.00000%
            
            Flat
            
            003901










Exhibit
"A"
 
 Sep 04,
2009
 Page 1
of 1
 Plains
Marketing L.P.
 Plains
      contract:
                
                2582-1013
                
                Effective:
      09-01-2009


PM
                Lease
              
              
              
              Lease
              
              Operator
              
              County/Parish
              
              State
              
              Price
      Code*
              
              Price
      Method**
              
              Applicable
                Deduct/
                Premium
              
              
              
              Percent
              
              Gravity
              
              State
                Lease(1)
              
              Allocated
      under 088859 MABEE K
              
              (*)   
      X1585
      SPECIAL POSTING-CNXSSH+RLL+PMID-NETPWTS/MID/14(2)
              
              Allocated
      under 089029 WELCH G
              
              (**) 
      EQUAL
      DAILY QUANTITIES(3)
              
              Allocated
      under 089054 WELCH & WELCH(4)
              
              Allocated
      under 890186 MCCLINTIC D & H STORAGE(5)
              
              Allocated
      under 890195 WINDHAM T #1 & #2(6)
              
              Allocated
      under 890196 HIRSCH E STORAGE(7)
              
              Allocated
      under 890199 HIRSCH F STORAGE(8)
              
              Allocated
      under 994628 MCCLINTIC E, G & J STORAGE(9)
              
              Allocated
      under 994947 PIONEER CENTRAL LACT(10)
              
              Allocated
      under 994948 SCHARBAUER C BRY STORAGE(11)
              
              Allocated
      under 994949 NORTH CURTIS BTY STORAGE(12)
              
              Allocated
      under 994950 DOVE Z BTY STORAGE(13)
              
              Allocated
      under 994951 CURTIS RSW BTY STORAGE(14)
              
              Allocated
      under 994997 MABEE BATTERY STORAGE(15)
              
              Allocated
      under 995418 DICKENSON STORAGE(16)
              
              Allocated
      under 995657 WOODY J#1 & #2(17)
              
              Allocated
      under 995846 GLASS RANCE CONSOLIDATED BATT(18)
              
              Allocated
      under 995864 ELMA L SLAUGHTER B STORAGE(19)
              
              Allocated
      under 995991 ASHLEY/LEONARD A STORAGE(20)
              
              Allocated
      under 995995 DAVENPORT RS A/A/B STORAGE(21)
              
              Allocated
      under 999514 PEMBROOK UNIT(22)
              
              Allocated
      under 999595 MCCLINTIC E & F STORAGE