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CALIFORNIA LABORATORY SERVICES ! <br /> 02/27/0411:38 ! <br /> ENSR-Sacramento Project: Former Unocal 0187,437 ELS VorkvC get cP&Q643 <br /> 10411 Old Placerville ltd_, Suite 210 Project Number: 06940-325-100 COC 4: 14237,14235,14236 ' <br /> Sacramento,CA 95827-2508 Project Manager: Ben I. Heningburg <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> ! <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes , <br /> Batch CN01521 -EPA 5030 Water MS <br /> Blank(CN01521-BLKI) Prepared&Analyzed: 02/24/04 , <br /> Di-isopropyl ether ND 0.50 µg1L <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 , <br /> Tert-amyl methyl ether ND 0.50 " <br /> 'Pert-butyl alcohol ND 5.0 " <br /> Surrogate:Toluene-d8 9.46 10.0 94.6 72-125 <br /> LCS(CN01521-BSI) Prepared&Analyzed: 02/24/04 , <br /> Methyl tert-butyt ether 21.4 0.50 µg/L 20.0 107 52-130 <br /> Surrogate:Toluene-d8 10.1 10.0 101 72-115 <br /> LCS Dup(CN01521-BSD1) Prepared&Analyzed: 02/24/04 <br /> Methyl tert-butyl ether 20.7 0.50 lag/L 20.0 104 52-130 3.33 30 <br /> Surrogate:Toluene-d8 9.99 10.0 99.9 71-115 ! <br /> Batch CN01557- EPA 5030 Water MS <br /> Blank(CN01557-BLKI) Prepared&Analyzed:02/25/04 <br /> Di-isopropyl ether ND 0.50 pg/L <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 ' <br /> Teri-amyl methyl ether ND 0.50 " <br /> Tert-butyl alcohol ND 5.0 " <br /> Surrogate:Toluene-d8 9.71 10.0 97.1 72-125 ! <br /> LCS(CN01557-BS1) Prepared&Analyzed: 02/25/04 <br /> Methyl tert-butyl ether 19.6 0.50 pg/L 20.0 98.0 52-130 <br /> Surrogate:Toluene-d8 10.2 10.0 102 72-125 , <br /> CA DOHS ELAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova,CA 95742 www.californialab.com 916-638-7301 Fax: 916-638-4510 ' <br />