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Entech Ana- lytical Labs, Inc. <br /> =NwN=wNwNNMwNw� <br /> . 3334 Victor Court • Santa Clara, CA 95054 + (408) 588-0200 Fax (408) 588-0201 <br /> Quality Control Results Summary <br /> QC Batch#: SMS2010331 Units: pg/Kg <br /> Matrix: Solid Date Analyzed: 3/31/01 <br /> Parameter Method Blank Spike - Spike Sample Spike QC Type %Recovery RPD RPD Recovery <br /> Result Sample lD Amount Result Result Limits Limits <br /> Test: Oxygenates by EPA 8260B <br /> Methyl-t-butyl Ether EPA 8260B ND 50 55.1 LCS 110.2 75.0- 147.0 <br /> Surrogate Surrogate Recovery Control Limits(%) <br /> 4-Bromofluorobenzene 97 56 - 131 <br /> Dibromofluoromethane 102 65 - 135 <br /> Toluene-d8 95 65 135 <br /> Test: Oxygenates by EPA 8260E <br /> Methyl-t-butyl Ether EPA 8260B ND 50 65.28 LCSD 130.6 16.91 75.0-147.0 <br /> Surrogate Surrogate Recovery Control Limits(%) <br /> 4-Bromofluorobenzene 100 56 - 131 <br /> Dibromofluoromethane 113 65 - 135 <br /> Toluene-d8 97 65 - 135 <br /> • <br /> Environmental Analysis Since 1983 <br />