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CHROMALAB, INC. Submission #: 1999-10-01" <br /> Environmental Services (SDB) <br /> To Wright Environmental Services Inc Test Method 8260A <br /> Attn Mana Reid �- Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GUMS <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch # 1999/10113-01 49 <br /> LCS 1999110113-0109-002 Extracted 10113119991418 Analyzed 10113119991418 <br /> LCSD 19991- 13-01 09-003 Extracted 10/13/19991456 Analyzed 10/13/1999 14 56 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%] RPD Ctrl Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS I LCSD <br /> Methyl tent-butyl ether 560 542 500 500 112 0 1084 33 65-165 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 493 555 500 500 98 6 111 0 76-114 <br /> 1220 Quarry Lane"Pleasanton,CA 94566-4756 <br /> Telephone (925)4841919"Facsimile (925)484-1096 <br /> Printed on 10/18/1999 15 14 Page 6 of 6 <br />