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CALIFORNIA LABORATORY SERVICES <br /> 08/30/04 09:43 , <br /> ENSR-Sacramento Project: Former Unocal 0187,437 EC:LS V9orkv�rde cct�711 <br /> 10411 Old Placerville Rd.,Suite 210 Project Number: 06940-325-100 <br /> Sacramento,CA 95827-2508 Project Manager: Ben L Heningburg COC 4: 1,2,3 <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 CN06537-EPA 5030 Water MS <br /> Blank(CN06537-BLK1) Prepared&Analyzed: 08/24/04 <br /> Di-isopropyl ether ND 0.50 pg1L <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 /> Tert-butyl alcohol ND 5.0 " <br /> Surrogate: Toluene-d8 9.37 10.0 93.7 72-125 <br /> LCS(CN06537-BS1) Prepared&Analyzed: 08/24/04 , <br /> Methyl tert-butyl ether 20.4 0.50 pg/L 20.0 102 52-130 <br /> Surrogate:Toluene-d8 10.1 10.0 102 72-125 , <br /> LCS Dup(CN06537-BSD1) Prepared&Analyzed: 08/24/04 <br /> Methyl ten-butyl ether 19.5 0.50 pg/L 20.0 97.5 52-130 4.51 30 <br /> Surrogate:Toluene-d8 10.2 10.0 102 72-125 <br /> Batch CN06577- EPA 5030 Water MS <br /> Blank(CN06577-BLKI) Prepared&Analyzed: 08/25/04 ' <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 /> tert-Amyl methyl ether ND 0.50 " <br /> Tert-butyl alcohol ND 5.0 " <br /> Surrogate:Toluene-d8 9.44 10.0 94.4 72-125 <br /> LCS(CN06577-BSI) Prepared&Analyzed: 08/25/04 , <br /> Methyl tert-butyl ether 19.5 0.50 pg/L 20.0 97.5 52-130 <br /> Surrogate: Toluene-d8 10.5 10.0 105 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 />