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Drive 885 ,Cws a— ) Sequoia Morgan Hill,1CA 950375037 (408)776-9600 VAW Analytical FAX(408)782 6308 www sequoialabs torr URS Corporation f 11 Project ARCO#2093,Tracy,CA 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported Sacramento CA,95833 Project Manager Vern Elarth 09/30/02 08 20 Volatlie Organic Compounds by EPA Method 8260B Sequoia Analytical-Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes ATR-2 LI0355-01 Water Sampled 09/11/02 15 00 Received 09/13/02 16 20 tert-Butyl alcohol ND 100 ug/l 5 2I25007 09/25/02 09/25/02 EPA 8260B Methyl tert-butyl ether 110 2 5 " Dr-isopropyl ether ND 2 5 " Ethyl tert-butyl ether ND 2 5 " tert-Amyl methyl ether ND 2 5 " Surrogate 12-Dtchloroethane-d4 129% 78-129 " ATR-3 LI0355-02 Water Sam led 09/11/02 13 58 Received 09/73/02 16 20 tert-Butyl alcohol ND 20 ugll 1 2125007 09/25/02 09/25/02 EPA 8260E Methyl tert-butyl ether ND 050 " Di-isopropyl ether ND 050 " Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 " Surrogate 12-Dtchloroethane-d4 122% 78-129 " AftTR-4 LI0355-03 Water Sampled 09/11/02 12 50 Received 09/13/02 16 20 ert-Butyl alcohol ND 20 ug/I 1 2124029 09/24/02 09/25/02 EPA 8260B Methyl cert-butyl ether ND 050 " Di-isopropyl ether ND 050 Ethyl tert-butyl ether ND 050 " tent-Amyl methyl ether ND 050 " Surrogate 12-Dichloroethane-d4 124% 78-129 " ATR-5 ML10355-04 Water Sam led 09/77/02 14 20 Received 09/73/02 16 20 tert-Butyl alcohol ND 20 ug11 1 2124029 09/24/02 09/25/02 EPA 8260E Methyl tert-butyl ether 19 0 50 Di-isopropyl ether ND 050 Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 " Surrogate 12-Dtchloroethane-d4 122% 78-129 Sequoia Analytical-Morgan Bill 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 5 of 13