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C H RO MALAB, INC. Submission #- 2000-04-0351 <br /> Environmental Services(SDB) <br /> To Wright Environmental Services Inc Test Method 8260A <br /> Attn Maria Reid Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GC/MS <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch#2000104124-02 39 <br /> LCS 2000104124-02 39-002 Extracted 04/24/2000 13 02 Analyzed 04/24/2000 13 02 <br /> LCSD 2000104124-02 39-003 Extracted 04/24/2000 13 31 Analyzed 04/24/2000 13 31 <br /> Compound Conc [ug/L] Exp Conc [ug/L] Recovery[%]j RPD Ctrl Limits[%] Flags <br /> LCS LCSD LCS LCSD I LCS I LCSD [%] Recovery RPD LCS LCSD <br /> Methyl tert-butyl ether 487 510 500 500 974 1020 46 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 463 464 500 500 926 92 8 76-114 <br /> 1220 Quarry Lane`Pleasanton,CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 05/02/2000 10 28 Page 12 of 13 <br />