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COULAB CORE LABORATORIES Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 990877 Report Date 05/31/1999 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time ' LCS Laboratory Control Sample 09043002 05/24/1999 1226 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Benzene 53 32 50 106 6 39-150 Ethylbenzene 50 48 50 101 0 32-160 Methyl-t-Butyl Ether (MTBE) 274 16 250 109 7 50-150 Toluene 52 98 50 106 0 46-148 ' xylenes (total) 158 10 150 105 4 75 125 LCD Laboratory Control Sample Duplicate 09043002 05/24/1999 1337 ' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 43 99 53 32 50 88 0 39 150 19 2 20 Ethylbenzene 45 13 50 48 50 90 3 32 160 11 2 20 Methyl-t-Butyl Ether (MTBE) 247 0/ 274 16 250 98 8 50-150 10 4 25 WTuene 45 91 52 98 50 91 8 46 148 14 3 20 ones (total) 141 85 158 10 15C 94 6 75 125 10 8 20 ' MS Matrix Spike 09043001 990879-1 05/24/1999 2015 Parameter/Test Description QC Result QC Result True Value Drig Value Calc Result Limits ' Benzene 42 69 50 0 00 85 4 39 150 Ethylbenzene 39 60 50 1 57 76 1 32-160 Methyl-t-Butyl Ether (MTBE) 249 27 250 3 91 98 1 50-150 Toluene 43 41 50 1 98 82 9 46-148 ' Xylenes (total) 128 1C 150 2 62 83 7 75-125 MSD Matrix Spike Duplicate 09043001 990879-1 05/24/1999 2041 ' Parameter/Test Description QC Result CC Result True Value Orig Value Calc Result Limits Benzene - 43 39 42 69 50 0 00 86 8 39-150 2 20 ' Ethylbenzene 40 5C 39 60 50 1 57 77 9 32 160 2 20 Methyl-t-Butyl Ether (MTBE) 240 58 249 27 250 3 91 94 7 50-150 4 25 ' Toluene 44 82 43 41 50 1 98 85 7 46 148 3 20 Xylenes (total) 128 41 128 1U 15C 2 62 83 9 75-125 0 20 I Page 45 * Y=/ REC, R=RPD, A=ABS Diff D=% Diff