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ILI ' 1551 Industnal Road Sequoia San Carlos CA 94070 (650)232-9600 Analytical FAX(650)232-9612 www sequoialabs Donn Ryan/Geostrategies(I Project Tosco(1) Sierra Court,Suite J Project Number Tosco#01205(Circle K),Lathrop Reported Dublin CA,94568 Project Manager Deanna Harding 05/13/02 09 26 Volatile Organic S Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-7(L204130-08)Water Sampled 04/29/02 14 50 Received 04/29/02 17 20 R-05 Ethanol ND 10000 ug/1 20 2050009 05/06/02 05/06/02 EPA 8260E - 1,2-Dibromoethane ND 40 1,2-Dichloroethane ND 40 " ^ Di-isopropyl ether ND 40 " Ethyl tert-butyl ether ND 40 ^ " Methyl tert-butyl ether ND 40 " Tert-amyl methyl ether ND 40 " Tert-butyl alcohol ND 2000 Surrogate 1,2-Dichloroethane-d4 918% 70-130 Surrogate Toluene-d8 992% 70-130 MW-8(L204130-09)Water Sampled 04/29/02 10 45 Received 04/29/02 17 20 -� Y Ethanol ND 500 ug/l 1 2050009 05/06/02 05/06/02 EPA 8260B 1,2-Dibromoethane ND 20 1,2-Dichloroethane ND 20 D pyI ether ND 20 E -butyl ether ND 2 0 Me yl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Tert-butyl alcohol ND 100 " Surrogate 1,2-Dichloroethane-d4 958% 70-130 " Surrogate Toluene-d8 992% 70-130 " MW-9(1,204130-10)Water Sampled 04/29/02 13 45 Received 04/29/02 17 20 R-05 Ethanol ND 5000 ug/l 10 2050009 05/06/02 05/06/02 EPA 9260B 1,2-Dibromoethane ND 20 1,2-Dichloroethane ND 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 Methyl cert-butyl ether ND 20 Tert-amyl methyl ether ND 20 Tert-butyl alcohol ND 1000 " ^ Surrogate 1,2-Dichloroethane-d4 888% 70-130 " Surrogate Toluene-d8 980% 70-130 S*Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 8 of 14