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i 1 Q UAL 1 T Y C O N T R O L R E S U L T S Job Number 200207 Report Date 02/03/2000 ' CUSTOMER IT Group PROJECT Southland - Martinez ATTN Rhonda Teicheira OC Type Description Reag Code Lab ]D Dilution factor Date Time LCS Laboratory Control Sample 09111502 01/31/2000 1452 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 51 87 50 103 7 39-150 Ethylbenzene 52 49 50 105 0 32-160 Methyl-t-Butyl Ether (MTBE) 227 56 250 91 0 50-150 Toluene 54 02 50 108 0 46-148 xylenes (total) 168 82 150 112 5 75-125 LCD Laboratory Control Sample Duplicate 09111502 01/31/2000 1518 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 48 86 51 87 50 97 T 39-150 6 0 20 Ethylbenzene 49 51 52 49 50 99 0 32-160 5 8 20 tlethyl t-Butyl Ether (MTBE) 207 63 227 56 250 83 1 50-150 9 2 25 '�ene 50 90 54 02 50 101 8 46-148 5 9 20 Xylenes (total) 159 49 168 82 150 106 3 75-125 5 7 20 'I M5 Matrix Spike 09111501 200225-4 02/01/2000 0051 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ' Benzene 48 25 50 0 00 96 5 39-150 Ethylbenzene 47 10 50 0 00 94 2 32-160 Methyl-t-Butyl Ether (MTBE) 231 52 250 0 00 92 6 50-150 ' Toluene 49 12 50 0 00 98 2 46-148 xylenes (total) 152 27 150 0 00 101 5 75-125 MSD I Matrix Spike Duplicate 09111501 200225-4 02/01/2000 0117 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 47 96 48 25 50 0 00 95 9 39-150 1 20 ' Ethylbenzene 46 78 47 10 50 0 00 93 6 32-160 1 20 tlethyl-t-Butyl Ether (MTBE) 231 36 231 52 250 0 00 92 5 50-150 0 25 ' Toluene 48 74 49 12 50 0 00 91 5 2046-148 Xylenes (totaL) 151 46 152 27 150 0 00 101 0 75-125 1 20 Page 8 * %=% REC, R=RPD, A=ABS Diff , D=% Diff