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CHROMALAB, INC. Submission#: 2000-03-0524 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland Test Method: 8260A <br /> I Attn: Keith Sheets Prep Method: 8260A <br /> Batch QC Report <br /> t <br /> Fuel Oxygenates by GC/MS <br /> Laboratory Control Spike(1-CS/1-MID) Water . QC Batch#2000103130-01.39 <br /> LCS: 2000103130-01.39-002 Extracted: 03/30/2000 05:58 Analyzed 03/30/2000 05:58 <br /> LCSD: 2000103130-01.39-003 Extracted: 03/30/2000 06:26 Analyzed 03/30/2000 06:26 <br /> Compound Conc. [uglL] Exp.Conc. [uglL] Recovery[%] RPD Ctrl.Limits[%] Flags <br /> r <br /> LCS LCSD LCS LCSD LCS. LCSD [%] Recovery RPD LCS LCSD <br /> Methyl tent-butyl ether 59.6 60.5 50.0 50.0 919.2 121.0 1.5 65-165 20 <br /> Surrogate(s) <br /> 1 1,2-Dichloroathane-d4 526 54.0 500 500 105.2 10.8 76-114 <br /> r <br /> i <br /> f <br /> i <br /> i <br /> i <br /> 1220 Quarry Lane•Pleasanton,CA 94566-4756 <br /> Telephone:(925)4841919`Facsimile:(925)484-1096 <br /> (. Printed on:041051200011:04 Page 6 of 7 <br />