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C H RO MALAB, INC. Submission #: 1999-08-0176 <br /> Environmental Services (SDB) <br /> To Aqua Science Engineers, Inc Test Method 8260A <br /> Attn Ian T Reed Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GUMS <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch # 1999108117-01 06 <br /> LCS 1999/08/17-01 06-002 Extracted 08/17/1999 10 33 Analyzed 08/17/1999 10 33 <br /> LCSD 1999/08117-01 06-003 Extracted 08/17/1999 10 58 Analyzed 08/17/1999 10 58 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery F/al RPD Ctrl Limits [%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Methyl ter,-butyl ether 456 486 500 5111 912 972 64 65-165 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 480 502 500 500 960 1004 76-114 <br /> 1220 Quarry Lane"Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/20/1999 18 12 Page 10 of 12 <br />