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STL ChromaLab <br /> Submission #: 2001-08-0260 <br /> Environmental Services(CA 1094) <br /> To: CH2M Hill-Oakland Test Method: 8015M. <br /> Attn: Keith Sheets Prep Method: 5030 <br /> Batch QC Report <br /> Gas/BTEX by 8015M18021 <br /> Laboratory Control Spike(LCSILCSD) Water QC Batch#2001108121-01.02 <br /> LCS: 2001108121-01.02-006 Extracted: 08/21/200109:48 Analyzed 08/21/200109:48 <br /> LCSD: 2001108121-01.02-007 Extracted: 081211200110:19 Analyzed 081211200110:19 <br /> Compound Conc. [ug/L] Exp.Conc. [ug/L] Recovery[%] RPD Ctrl.Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Gasoline 457 424 500 500 91.4 84.8 7.5 75-125 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene-FI 530 500 500 1 500 106.0 100.0 50-150 <br /> I <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919*Facsimile:(925)484-1096 <br /> Printed on:08/22/2001 12:33 page 7 of 7 <br /> I <br />