Exhibit 99.4
 Data and Consulting Services
Division of Schlumberger Technology CorporationTwo Robinson Plaza, Suite 200
6600 Steubenville Pike
Pittsburgh, Pennsylvania 15205
Tel: 412-787-5403

Fax: 412-787-2906
    
    (SCHLUMBERGER LOGO)
  
   Table 1




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Data & Consulting Services
Division of Schlumberger Technology Corporation
    
    (SCHLUMBERGER LOGO)
 
 Table 1
 Estimated Net Reserves And Future Net Revenue
Certain Proved Oil And Gas Interests
BreitBurn Management Company, LLC
United States Producing Properties
As Of 31 December 2009
 Proved
    
    
    Proved
    
    
    Proved
    
    
    TotalProducing
    
    
    Non-producing
    
    
    Undeveloped
    
    
    ProvedReserves
    
    
    Reserves
    
    
    Reserves
    
    
    ReservesRemaining Net ReservesOil/Cond/Ngl  Mbbls
    
    
    3,297.05
    
    
    
    690.23
    
    
    
    1,089.11
    
    
    
    5,076.38Gas  MMscf
    
    
    344,412.27
    
    
    
    53,621.83
    
    
    
    35,539.94
    
    
    
    433,574.03Income Data (M$)Future Net Revenue
    
    
    1,509,569.96
    
    
    
    247,452.44
    
    
    
    195,321.36
    
    
    
    1,952,343.75DeductionsOperating Expense
    
    
    771,394.25
    
    
    
    54,440.91
    
    
    
    35,926.54
    
    
    
    861,761.69Production Taxes
    
    
    93,124.03
    
    
    
    14,469.43
    
    
    
    12,305.25
    
    
    
    119,898.71Investment
    
    
    37,918.42
    
    
    
    28,932.05
    
    
    
    42,783.13
    
    
    
    109,633.60Future Net Cashflow
    
    
    607,133.26
    
    
    
    149,610.05
    
    
    
    104,306.44
    
    
    
    861,049.75Discounted PV @ 10% (M$)
    
    
    285,350.31
    
    
    
    55,444.17
    
    
    
    31,426.74
    
    
    
    372,221.22




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Data & Consulting Services
Division of Schlumberger Technology Corporation
    
    (SCHLUMBERGER LOGO)




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Data & Consulting Services
Division of Schlumberger Technology Corporation
    
    (SCHLUMBERGER LOGO)




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Data & Consulting Services
Division of Schlumberger Technology Corporation
    
    (SCHLUMBERGER LOGO)
 
     /s/ Denise L. Delozier
Denise L. Delozier
    
    
    
    /s/ Charles M. Boyer

Charles M. Boyer II, PG, CPGSenior Engineer
    
    
    
    Scientific AdvisorUnconventional Reservoirs/s/ Walter K. Sawyer

Walter K. Sawyer, P.E.
    
    
    
    /s/ Jeron R. Williamson

Jeron R. WilliamsonPrincipal Consultant
    
    
    
    Senior Engineer




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SECURITIES
AND EXCHANGE COMMISSION
REGULATION S-X, RULE 210.4-10 (a)
 RESERVES DEFINITIONS
 Analogous reservoir.
     Instruction to paragraph (a)(2):
 Deterministic estimate.
 Developed oil and gas reserves.
   Economically producible.
 Oil and gas producing activities.
     1
 2
  Instruction 1 to paragraph (a)(16)(i):




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Instruction 2 to paragraph (a)(16)(i): saleable hydrocarbons
      Possible reserves.




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Probable reserves.
     Probabilistic estimate.
 Proved area.
 Proved oil and gas reserves.




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Proved properties.
 Reasonable certainty.
 Reliable technology.
 Reserves.
 Note to paragraph (a)(26): i.e. i.e.
 Reservoir.
 Resources.
 Undeveloped oil and gas reserves.
    Unproved properties.