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i <br /> STL ChromaLab Submission #: 2001-08-0154 <br /> Environmental Services(CA 10 94) <br /> To: CH2M Hill-Oakland Test Method: 8021 B <br /> Attn: Keith Sheets Prep Method: 5030 <br /> i <br /> Batch QC Report <br /> Gas/BTEX by 8015M/8021 <br /> r <br /> I Laboratory Control Spike(LCSILCSD) Water QC Batch#2001/08114-01.03 <br /> LCS: 2001108/14-01.03-005 Extracted: 081141200108:51 Analyzed 08/14/200108:51 <br /> LCSD: 2001108/14-01.03-009 Extracted: 08/14/200110:53 Analyzed 081141200110:53 <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 /> Benzene 81.9 90.2 100.0 100.0 81.9 90.2 9.6 77-123 20 <br /> Toluene 80.0 88.5 100.0 100.0 80.0 88.5 10.1 78-122 20 <br /> j Ethyl benzene 80.6 89.0 100.0 100.0 80.6 89.0 9.9 70-130 20 <br /> Xylene(s) 242 264 300 300 80.7 88.0 8.7 75-125 20 <br /> Surrogates) <br /> Trifluorotoluene 357 394 500 500 71.4 78.8 58-124 <br /> J <br /> 1220 Quarry lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919"Facsimile:(925)484-1096 <br /> Printed on:08/15/2001 17:27 Page.11 of 14 <br />