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f <br /> ♦ Y � � <br /> C H ROMALAB, INC. Submission #: 2000-04-0434 <br /> Environmental Services(SDB) <br /> To , Wright Environmental Services Inc Test Method 8260A <br /> Attn Chris Palmer Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GC/MS <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch #E 2000/05/05-01 39 <br /> LCS 2000105105-01 39-002 Extracted 05/05/2000 10 49 Analyzed 05/05/2000 10 49 <br /> LCSD 2000105105-0139-003 Extracted 05105120001128 Analyzed 05/05120001128 <br /> Compound Cone (ug/L] Exp Cone [ug/L] lRecovery[% RPD I Ctrl Limits[%] Flags <br /> LCS LCSD LCS I LCSD LCS LCSD (%] Recovery RPD LCS LCSD <br /> Methyl tent-butyl ether 491 501 500 500982 1002 20 65-165 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 516 512 500 500 103 2 1024 76-114 <br /> 1220 Quarry Lane'Pleasanton CA 94566-4756 <br /> Telephone (925)484-1999'Facsimile (925)484-1096 <br /> Printed on 05/08/2000 13 32 Page 6 of 8 <br />