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• CALIFORNIA LABORATORY SERVICES <br /> 09/26/05 10 38 <br /> APEX Envirotech Inc -Gold River Project Cohn Property <br /> 11244 Pyrites Way Project Number COH01 001-QM CLS Work Order COi0640 <br /> # <br /> Gold River,CA 95670 Project Manager Drew Van Allen <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch C007145- EPA 5030 Water MS <br /> Blank(CO07145-BLK1) Prepared&Analyzed 09/20/05 <br /> DI isopropyl ether ND 050 µg/L <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> ten-Amyl methyl ether ND 050 " <br /> Tert-butyl alcohol ND 50 " <br /> Surrogate Toluene-d8 999 100 999 72-125 <br /> LCS(CO07145-BSI) Prepared&Analyzed 09/20/05 <br /> Methyl tert butyl ether 190 050 µg/L 200 950 52-130 <br /> Surrogate Toluene d8 102 100 102 72-125 <br /> O—CS Dup(CO07145-BSD1) Prepared&Analyzed 09/20/05 <br /> Methyl Cert butyl ether 198 050 µg/L 200 990 52-130 4 12 30 <br /> Surrogate Toluene d8 101 100 101 72-125 <br /> CA DOHS ELAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova, CA 95742 www californlalab com 916-638-7301 Fax 916-638-4510 <br />