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885 Jarvis Drive Se(lIIUla Morgan Hilt CA 95037037 (D (409)776-9600 V*W Analytical FAX(408)782-6308 WWW sevuoialabs con URS Corporation f 11 Project ARCO 92093,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 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical-Morgan MI) Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes ATR-6 MLI0355-05 Water Sampled 09/111021315 Received 09/13/02 I6 20 tert-Butyl alcohol ND 20 ug/l 1 2124029 09/24/02 09/25/02 EPA 8260B Methyl tert-butyl ether 0 68 050 Di-isopropyl ether ND 0 50 " Ethyl cert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 Surrogate 12-Dichloroethane-d4 128% 78-129 " ATR-7 MLI0355-06 Water Sampled 09/11/02 13 35 Received 09/13/02 16 20 tert-Butyl alcohol ND 20 ug/l 1 2I24029 09/24/02 09/25/02 EPA 8260E Methyl tert-butyl ether 1 1 050 Di-isopropyl ether ND 050 Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 0 50 Surrogate 12-Dichloroethane-d4 124% 78-129 AIRhkTR-8 MLI0355-07 Water Sampled 09/11/02 14 00 Received 09/13/02 16 20 ert-Butyl alcohol ND 20 ug/l I 2124029 09/24/02 09/25/02 EPA 8260B Methyl tert-butyl ether 073 050 " Di-isopropyl ether ND 050 Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 Surrogate 12-Dichloroethane-d4 124% 78-129 ATR-9(ML10355-08)Water Sampled 09/11/02 11 55 Received 09/13/02 16 20 tert-Butyl alcohol ND 20 ug/1 1 2I24029 09/24/02 09/25/02 EPA 8260B 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-Dichloroethane-d4 117% 78-119 Sequoia Analytical-Morgan Hill 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 6 of 13