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CALIFORNIA LABORATORY SERVICES <br /> 01/19/04 10:33 <br /> GEOLOGICAL TECHNICS INC. Project: Del Valle Property CLS Work Order#:CNA0431 <br /> 1101 7th St. Project Number: 1117.2 <br /> COC#:None <br /> MODESTO,CA 95354 Project Manager. Eric Price <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 CN00423-EPA 5030 Soil MS <br /> Blank(CN00423-BLKI) Prepared&Analyzed:01/16/04 <br /> Di-isopropyl ether ND 5.0 pg/kg <br /> Ethyl tert-butyl ether ND 5.0 " <br /> Methyl tert-butyl ether ND 5.0 " <br /> Tert-amyl methyl ether ND 5.0 " <br /> Tert-butyl alcohol ND 50 " <br /> Surrogate:Toluene-d8 49.3 75.0 65.7 60-140 <br /> LCS(CN00423-BSl) Prepared&Analyzed:01/16/04 <br /> Methyl tert-butyl ether 50.2 5.0 pg/kg 50.0 100 60-140 <br /> Surrogate:Toluene-d8 49.1 75.0 65.5 60-140 <br /> LCS Dup(CN00423-13SD1) Prepared&Analyzed:01/16_/04 <br /> Methyl cert-butyl ether 58,1 5.0 pg/kg 50.0 116 60-140 14.6 30 <br /> Surrogate:Toluene-d8 51.3 75.0 68.4 60-140 <br /> Matrix_ Spike(CN00423-MS1) Source:CNA0431-02 Prepared_.01!16!04_ Analyzed:01/17/04 <br /> Methyl tert-butyl ether 74.8 5.0 gg/kg 50.0 ND 150 60-140 QM-07 <br /> Surrogate:Toluene-d8 52.8 75.0 70.4 60-140 <br /> Matrix Spike Dup(CN00423-MSD1) Source:CNA043_1-02 Prepared:01/16/04 Analyzed:01/17/04 <br /> Methyl tert-butyl ether 67.7 5.0 gg/kg 50.0 ND 135 60-140 9.96 30 <br /> Surrogate:Toluene-d8 53.0 75.0 70.7 60-140 <br /> CA DOHS ELAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova,CA 95742 www.californialab.colll 916-638-7301 Fax: 916-638-4510 <br />