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I Q UAL I T T C O N T R O L R E S U L T S Job Number 200190 Report Date 01/31/2000 1 CUSTOMER IT Croup PROJECT- Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time ' LC5 laboratory Control Sample D9111502 01/28/2000 1247 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F �Benzene 56 10 50 112 2 39-150 Ethylbenzene 55 82 50 111 6 32-160 Methyl-t-Butyl Ether (MTBE) 224 85 250 89 9 50-150 Toluene 58 60 50 117 2 46-148 'Xylenes (total) 180 46 150 120 3 75-125 LCD Laboratory Control Sample Dupticate 09111502 01/28/2000 1313 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 54 81 56 10 50 109 6 39-150 2 3 20 �Ethylbenzene 54 19 55 82 50 108 4 32-160 3 0 20 Methyl-t-Butyl Ether (MTBE) 222 15 224 85 250 88 9 50-150 1 2 25 ne 57 26 58 60 50 114 5 46-148 2 3 20 Fjoanes (total) 174 61 180 46 150 116 4 75-125 3 3 20 iMS Matrix Spike 09111501 200190-9 01/28/2000 2342 Parameter/Test Description QC Result QC Result True Value Drig Value Calc. Result * Limits F iBenzene 74 24 50 28 93 90 6 39-150 Ethylbenzene 50 88 50 3 38 95 0 32-160 Methyl-t-Butyl Ether (MTBE) 194 63 250 4 69 76 0 50-150 fluene 57 80 50 10 92 93 8 46-148 lenes (total) 168 30 150 17 85 100 3 75-125 MSD Matrix Spike Duplicate 09111501 200190-9 T 01/29/2000 0008 iParameter/Test Description QC Result QC Result True Value Orig Value Calc Result Limits F Benzene 74 81 74 24 50 28 93 91 8 39-150 1 20 i Ethylbenzene 50 80 50 88 50 3 38 94 8 32-160 0 20 Methyl-t-Butyl Ether (MTBE) 190 05 194 63 250 4.69 74 1 50-150 2 25 i Toluene 57 63 57 80 50 10 92 93.4 46-148 0 20 Xylenes (total) 168 32 168 30 150 17 85 100 3 75-125 0 20 1 • ' Page 12 * X=X REC, R=RPD, A=ABS Diff , D=% Diff i