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CHROMALAB, INC. Submission #: 1999-12-0377 <br /> Environmental Services(SDB) 1 <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(LCS/LCSD) Water QC Batch # 1999112129-01.06 <br /> LCS: 1999112129-01.06-002 Extracted: 121291199916:07 Analyzed: 121291199916:07 <br /> LCSD: 1999/12129-01.06-003 Extracted: 121291199916:34 Analyzed: 121291199916:34 <br /> { <br /> Compound Conc. [uglL] Exp,Conc. f uglL] Recovery[% RPD Ctrl. Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD I� <br /> Methyl tert-butyl ether 52.0 56.1 50.0 50.0 104.0 112.2 7.6 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 474 492 500 500 94.8 98.4 76-114 ! <br /> I. <br /> F - <br /> I' <br /> 1 <br /> { <br /> 1220 Quarry LanePleasanton,CA 945664756 <br /> Telephone:(925)484-1919`Facsimile:(925)484-1096 <br /> Printed on:01/03/200015:0s Page 10 of 12 1 <br /> f i <br />