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STL Chrom'aLab Submission#: 2001-08-0586 <br /> Envirorunental Services(CA 1094) <br /> To: CH2M Hill-Oakland Test Method: 8260E <br /> :r Attn: Keith Sheets Prep Method: 6030B <br /> Batch QC Report <br /> Fuel Oxygenates by 8260E (Low Level) <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2001108/31-V1.27 <br /> LCS: 2001108131-V1.27-003 Extracted: 08/31/200110:42 Analyzed 08/311200110:42 <br /> LCSD: 2001/08131-V1.27-004 Extracted: 08/31/200111:10 Analyzed 08/31/200111:10 <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 /> Methyl tort-butyl ether 25,0 22.7 25 25 100.0 90.8 9.6 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dlchloroethane-d4 518 486 500 500 103.6 97.2 76-1.14 <br /> I <br /> f <br /> J <br /> 1 <br /> j <br /> r <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919*Facsimile:(925)484-1096 <br /> Printed on:010112001 15:27 Page 6 of 6 <br />