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CHROMALAB, INC. Submission #: 1999-12-0377 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland Test Method: 8260A <br /> Attn: Keith Sheets Prep Method: 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GUMS <br /> Laboratory Control Spike(LCSILCSD) Soil QC Batch#1999112130-01.06 <br /> LCS: 1999112130-01.06-002 Extracted: 121301199914:10 Analyzed: 121301199914:10 <br /> LCSD: 1999112130-01.06-003 Extracted: 121301199913:09 Analyzed: 121301199913:09 <br /> Compound Conc. j ug/Kg] Exp.Conc. [ug/Kg] Recovery[% RPD Ctrl. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%) Recovery RPD LCS LCSD <br /> Methyl tert-butyl ether 92.0 93.4 100.0 100.0 92.0 93.4 1.5 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 461 443 500 500 92.2 88.6 70-121 <br /> A <br /> f <br /> i <br /> i <br /> j <br /> i <br /> 1220 Quarry Lane*Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919Facsimile:.(925)484-1096 <br /> Printed on:01/03/2000 15:08 Page 4 Of <br />