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CHROMALAB, INC. <br /> Submission #: 2000-03-0524 <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 /> Matrix Spike(MS 1 MSD) Water QC Batch#2000103130-01.39 <br /> Sample 1D: E-4 Lab Sample ID:2000-03-0524-002 <br /> MS: 2000103130-01.39-004 Extracted:03130/200012:15 Analyzed: 03/30/2000 12:15 Dilution: 1.0 <br /> MSD: 2000103130-01.39-005 Extracted:03130/200013:41 Analyzed: 031301200013:41 Dilution: 1.0 <br /> Compound Cona [ug/L] Exp.Conc. u IL lRecovery[%IRPD Ctrl.Limits[%] Flags <br /> MS MSD Sample MS MSD MS MSD [%] Recovery RPD MS MSD <br /> Methyl tent-butyl ether 62.1 57.7 ND 50.0 50.0 124.2 115.4 7.3 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 557 496 500 500 111.4 99.2 76-114 <br /> i <br /> I <br /> I <br /> r <br /> I <br /> l <br /> k <br /> _ E <br /> i <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone:(925)484-1919`Facsimile:(925)484-1096 <br /> Printed on:04/05/2000 11:04 Page 7 Of 7 .. <br /> i <br />