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CALIFORNIA LABORATORY SERVICES ' 08/30/04 09:43 ' ENSR-Sacramento Project: Former Unocal 0187,437 EKWor&drderc#:tC %711 10411 Old Placerville Rd.,Suite 210 Project Number: 06940-325-100 COC#: 1,2,3 ' Sacramento,CA 95827-2508 Project Manager: Ben 1,Heningburg Volatile Organic Compounds by EPA Method 8260B Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note U-17(CNH0711-17)Water Sampled:08/17/04 14:40 Received: 08/20/04 18:17 ' Di-isopropyl ether 0.83 0.50 µg/L 1 CN00577 08/25/04 08/25/04 EPA 8260B Ethyl tert-butyl ether ND 0.50 Methyl tert-butyl ether ND 0.50 " tert-Amyl methyl ether ND 0.50 Tert-butyl alcohol ND 5.0 " Surrogate: Toluene-d8 98.5% 72-125 ' U- 18(CNH0711-18)Water Sampled:0811710415:27 Received: 08/20/04 18:17 Di-isopropyl ether ND 0.50 µg/L 1 CN06577 08/25/04 08/25/04 EPA 8260B ' Ethyl tert-butyl ether ND 0.50 Methyl tert-butyl ether ND 0.50 " tent-Amyl methyl ether ND 0.50 ;; ;; • Tert-butyl alcohol ND 5.0 " Surrogate: Toluene-d8 95.8% 72-125 ' U-19(CNH0711-19)Water Sampled:08/17/04 16:12 Received: 08/20/04 18:17 Di-isopropyl ether 1.3 0.50 µg/L 1 CN06577 08/25/04 08/25/04 EPA 8260B Ethyl tert-butyl ether ND 0.50 ' Methyl tert-butyl ether ND 0.50 tert-Amyl methyl ether ND 0.50 " Ter(-butyl alcohol ND 5.0 ' Surrogate: Toluene-d8 962% 72-125 " U-20(CNH0711-20)Water Sampled:08/18/04 11:49 Received: 08/20/04 18:17 ' Di-isopropyl ether 0.67 0.50 µg/l- 1 CN06577 08/25/04 08/25/04 EPA 8260B Ethyl tert-butyl ether ND 0.50 " Methyl tert-butyl ether ND 0.50 tert-Amyl methyl ether ND 0.50 " Tert-butyl alcohol ND 5.0 " Surrogate: Toluene-d8 95.3% 72-125 , CA DOHS FLAP Accreditation/Registration Number 1233 3249 Fitzgerald Road Rancho Cordova, CA 95742 www.californialab.com 916-638-7301 Fax: 916-638-4510 '