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C <br /> ' 1551 Industrial Road <br /> S e qu o l a San Carlos CA 94070 <br /> 4D (650)232 9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs cam <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981, Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-7 L203104-17)Water Sampled 03/20/02 14 00 Received 03/21/02 18 40 R-05 <br /> Ethanol ND 10000 ug/l 20 2030068 03/25/02 03/25/02 EPA 8260B <br /> 1,2-Dibroinoethane ND 40 <br /> 1,2-Dichloroethane ND 40 " <br /> Di-isopropyl ether ND 40 <br /> Ethyl tert-butyl ether ND 40 <br /> Methyl tert-butyl ether ND 40 " ^ <br /> Tert-amyl methyl ether ND 40 " <br /> Tert-butyl alcohol ND 2000 <br /> Surrogate 1,2-Dichloroethane-d4 115% 70-130 " ^ <br /> Surrogate Toluene-d8 105% 70-130 " <br /> PTW-1 (L203104-18)Water Sampled 03/21/02 09 20 Received 03121102.18 40 _ <br /> Ethanol ND 500 ug/l 1 2030071 03/26/02 03/26/02 EPA 9260B <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 • <br /> Methyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 106% 70-130 " <br /> Surrogate Toluene-d8 974% 70-130 " <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 20 <br />