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., CALIFORNIA LABORATORY SERVICES <br /> Page 16 of 17 17/16/05 09 44 <br /> APEX Envirotech Inc -Gold River Project Cohn Property <br /> 11244 Pyrites Way Project Number COH01 001-QM CLS Work Order# COL0354 <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 C009392-EPA 5030 Water MS <br /> Wank(CO09392-BLK1) Prepared&Analyzed 12/12/05 <br /> Di-isopropyl ether ND 050 pg/L <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> tent-Amyl methyl ether ND 050 " <br /> Tert-butyl alcohol ND 50 " <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 10 " <br /> Surrogate Toluene d8 JO/ 10 0 101 72-125 <br /> OLS(CO09392-BSI) Prepared&Analyzed 12/12/05 <br /> Methyl tert butyl ether 194 0 50 pg/L 20 0 97 0 52-130 <br /> Surrogate Toluene d8 104 100 104 72-125 <br /> LCS Dup(CO09392-BSDI) Prepared&Analyzed 12/12/05 <br /> Methyl tert-butyl ether 197 0 50 pg/L 200 985 52-130 1 53 30 <br /> Surrogate Toluene-d8 104 100 104 72-125 <br /> •I <br /> CA DOHS FLAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova,CA 95742 www callfornialab com 916-638-7301 Fax- 916-638-4510 <br />