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CHROMALAftINC. Submission # 1999-10-0019 <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 GC/MS <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch # 1999110107-01 09 <br /> LCS 1999110107-01 09-002 Extracted 10/07/1999 13 54 Analyzed 10/07/1999 13 54 <br /> LCSD 1999110/07-01 09-003 Extracted 10/07/1999 14 31 Analyzed 10/07/1999 14 31 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery [%]' RPD Ctrl Limits [%] Flags <br /> LCS LCSD LCS I LCSD LCS I LCSD [%] Recovery RPD LCS LCSD <br /> Methyl tert-butyl ether 409 447 500 50 0 818 89 4� 89 65-165 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 450 551 500 500 900 110 2 76-114 <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919*Facsimile (925)484-1096 <br /> Printed on 10111/1999 09 04 Page 4 of 4 <br />