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STL ChromaLab Submission#: 2001-08.0260 <br /> Environmental Services(CA 1094)1 <br /> To: CH2M HIII-Oakland Test Method: 80218 <br /> Attn: Keith Sheets Prep Method: 5030 <br /> Batch QC Report <br /> Gas/BTEX by 8015M18021 <br /> Laboratory Control Spike(LCS/LCSD) . Water OC Batch 0 2001108121-01.02 <br /> LCS: 2001108121-01.02-004 Extracted: 081211200108:45 Analyzed 081211200108:45 <br /> LCSD: 2001108121-01.02-005 Extracted: 081211200109;16 Analyzed : 08121/200109:16 <br /> Compound Cone [ug/L] Exp.Conc. [ug/L] Recovery[%] RPD Ctrl.Limits[0%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> j Benzene 92.3 91.3 100.0 100.0 92.3 91.3 1.1 77-123 20 <br /> Toluene 94.4 93.4 100.0 100.0 94.4 93.4 1.1 78-122 20 <br /> Ethyl benzene 94.6 94.0 100.0 100.0 94.6 94.0 0.6 70-130 20 <br /> Xylene(s) 273 271 300 300 91.0 90.3 0.8 75-125 20 <br /> Surrogate(s) <br /> Trlfiuorotoluene 515 495 500 500 103.0 99.0 58-124 <br /> I . <br /> I <br /> I. <br /> i <br /> 1220 Quarry Lane"Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919`Facsimile:(925)484-1096 <br /> ii <br /> Printed on:08!2212001 12:33 Page 6 of 7 <br />