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' CALIFORNIA LABORATORY SERVICES <br /> i <br /> 11/30/04 13:17 <br /> ENSR-Sacramento Project: Former Unocal 0187,437E S Wark rderc tVNK0709 <br /> 10411 Old Piacerville Rd.,Suite 210 Project Number: 06940-325-100 COC 4: 1,2,3 <br /> Sacramento,CA 95827-2508 Project Manager: Ben Heningburg <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Reporting Spike Source %R-EC RPD <br /> 1 Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch CN09089-EPA 5030 Water MS <br /> LCS(CN09089-SSI) Prepared&Analyzed: 11/23/04 <br /> Methyl tert-butyl ether 19.5 0.50 µg/L 20.0 97.5 52-130 <br /> Surrogate: Toluene-d8 9.88 10.0 98.8 72-125 <br /> LCS Dup(CN09089-BSDI) Prepared&Analyzed: 11/23/04 <br /> Methyl tert-butyl ether 20.8 0.50 µg/L 20.0 104 52-130 6.45 30 <br /> Surrogate: Toluene-d8 9.65 10.0 96.5 71-125 <br /> I <br /> CA DOHS FLAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova, CA 95742 www.californialab.com 916-638-7301 Fax: 916-638-4510 <br />