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CALIFORNIA LABORATORY SERVICES <br /> 08/17/05 13 02 <br /> APEX Envtrotech Inc -Gold River Project Cohn Property CLS Work Order# COH0357 <br /> 11244 Pyntes Way Project Number COH01 001 <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 C006010- EPA 5030 Water MS <br /> Blank(CO06010-BLKI) Prepared&Analyzed 08/10/05 <br /> Di-isopropyl ether ND 050 pg/L <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 <br /> Tert-butyl alcohol ND 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Surrogate Toluene-0 100 100 100 72-125 <br /> LCS(CO06010-13S1) Prepared&Analyzed 08/10/05 <br /> Methyl tert-butyl ether 178 050 lig/L 200 890 52-130 <br /> •Surrogate Toluene-d8 101 1019 101 72-125 <br /> LCS Dup(0006010-BSD1) Prepared&Analyzed 08/10/05 <br /> Methyl tert-butyl ether 199 050 ltg/L 200 995 52 130 if 1 30 <br /> Surrogate Toluene-d8 102 100 102 72 125 <br /> Batch C006154- EPA 5030 Water MS <br /> Blank(CO06154-BLKI) Prepared&Analyzed 08/15/05 <br /> Ethanol C ND 50 lig/L <br /> Surrogate 12-Dichloroethane d4 - 31 7 300 106 66-135 <br /> LCS(CO06154-BSI) Prepared&Analyzed 08/15/05 <br /> Ethanol 101 50 pg/L 100 101 60-140 <br /> Surrogate 12-Dichloroethane-d4 307 300 102 66-135 <br /> LCS Dup(CO06154-BSDI) Prepared&Analyzed 08/15/05 <br /> Ethanol 85 8 50 lig/L 100 85 8 60-140 163 25 <br /> Surrogate 12-Dichloroethane d4 318 300 106 66 135 <br /> • <br /> CA DOHS ELAP Accredltatton/Reglstratton Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova, CA 95742 www callfornialab com 916-638-7301 Fax 916-638-4510 <br />