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CHROMALAB, INC. Submission #: 1999-10-0143 <br /> Environmental Services(SDB) <br /> To Wright Environmental Services Inc Test Method 8260A <br /> Attn Marla Reid Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GUMS <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch# 1999110/13-0109 <br /> LCS 1999110113-0109-002 Extracted 10113119991418 Analyzed 10/1311999 14 18 <br /> LCSD 1999/10/13-01 09-003 Extracted 10/13/1999 14 56 Analyzed 10/13/1999 145 6 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%] RPD Ctrl Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Methyl tert-butyl ether 560 542 500 500 1120 1084 33 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dirhloroethane-d4 493 555 500 500 986 ill 0 76-114 <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919*Facsimile (925)484-1096 <br /> Printed on loll 8/1999 15 14 Page 13 of 14 <br />