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Entech Analytical Labs, Inc. <br /> 3334 Victor Court • Santa Clara, CA 95054 • (408) 588-0200 • Fax (408) 588-0201 <br /> • Quality Control Results Summary <br /> QC Batch# WMS31105 Units µg/L <br /> Matrix Liquid Date Analyzed 7/25/01 <br /> Parameter Method Blank Spike Spike Sample Spike QC Type %Recovery RPD RPD Recovery <br /> Result Sample ID Amount Result Result Limits Limits <br /> Test Oxygenates by EPA 8260B <br /> Methyl-t-butyl Ether EPA 8260B ND 20 21 7 LCS 1085 650-1350 <br /> Surrogate Surrogate Recovery Control Limits(%) <br /> 4-Bromotluorobenzene 97 65 135 <br /> Dibromofluoromethane 112 57 - 139 <br /> Toluene-d8 110 65 - 135 <br /> Test Oxygenates by EPA 8260B <br /> Methyl-t-butyi Ether EPA 8260B ND 20 21 7 LCSD 108 5 000 2500 650-1350 <br /> Surrogate Surrogate Recovery Control Limits(%) <br /> 4-Bromofluorobenzene 101 65 - 135 <br /> Dibromofluoromethane 111 57 - 139 <br /> Toluene-d8 113 65 - 135 <br /> Environmental Analysis Since 7 983 <br />