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Committed To}our Succes Q UAL I T Y C O N T R O L R E S U L T S Job Number 992355 Report Date - 11/10/1999 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Telcheira QC Type Description Reag Code Lab ID Dilution factor Date Time ' CV Calibration Verification 49090101 11/09/1999 ]701 Parameter/Test Description QC Result QC Result True Value Oris Value talc Result Limits F 50 58 50 101 85-115 Benzene 49 64 50 99 85-115 Ethylbenzene 109 70-130 Methyl-t-Butyl Ether (MTBE) 271 54 250 95 100 85-115 49 Toluene 50 xylenes (total) 149 12 150 99 85-115 MS Matrix Spike 09090101 992355-1 11/09/1999 2324 ' Parameter/Test Description QC Result QC Result True Value Orig Value CaLc Result * Limits F Benzene 50 00 50 0 38 99 2 39-150 Ethylbenzene 49 12 50 0 00 98 2 32-160 Methyl-t-Butyl Ether (MTBE) 255 92 250 0 00 102 4 50-150 Toluene 49 76 50 0 53 98.5 46-148 Xylenes (total) 147 93 150 0 34 98 4 75-125 ' SD Matrix Spike Duplicate 09090101 992355-1 11/09/1999 2350 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result Limits F Benzene 50 90 50 00 50 0.38 101 0 2039-150 Ethylbenzene 50 08 49 12 50 0 00 100 2 32-160 2 20 Methyl-t-Butyl Ether (MTBE) 263.64 255 92 250 0 00 105.5 50-150 3 25 Toluene 50 59 49.76 50 0.53 100 1 46-148 2 20 Xylenes (total) 150 56 147 93 150 0 34 100 1 2075-125 GV Calibration Verification 090901 1 11/10/1999 0041 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 49.82 50 100 85-115 Ethy(benze.ie 49 23 50 98 85-115 ' Methyl-t-Butyl Ether (MTBE) 261 42 250 105 70-130 Toluene 49.28 50 99 85-115 Xylenes (total) 148 43 150 99 85-115 i Page 12 * X=X REC, R=RPD, A=ASS Diff D=X Diff a part of SL 1t rD I 1 x.411 Sl r�ILA Iql