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Entech Analytical Labs, Inc. <br /> 3334 Victor Court • Santa Clara, CA 95054 a (408) 588-0200 • Fax (408) 588-0201 <br /> Quality Control Results Summary <br /> QC Batch #: WMS31067 Units: µg/L <br /> Matrix: Liquid Date Analyzed: 713/01 <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: MTBE by EPA 8260B <br /> Methyl-t-butyl Ether EPA 8260E ND 20 18.5 LCS 92.5 65.0- 135.0 <br /> Surrogate Surrogate Recovery Control Limits(%) <br /> 4-Bromofluorobenzene 86 65 - 135 <br /> Dibromofluoromethane 104 57 - 139 <br /> Toluene-d8 122 65 - 135 <br /> Test: MTBE by EPA 8260E <br /> Methyl-t-butyl Ether EPA 8260E ND 20 20.7 LCSD 103.5 11.22 25.00 65.0- 135.0 <br /> Surrogate Surrogate Recovery Control Limits <br /> 4-Bromofluorobenzene 84 65 - 135 <br /> Dibromofluoromethan e 109 57 - 139 <br /> Toluene-d8 126 65 - 135 <br /> • <br /> i <br /> • <br /> Environmental Analysis Since 7983 <br />