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' a 819 Striker Avenue Suite 8 S e qu o 1 a Sacramento CA 95834 (916)925-9600 FAX Analytical www sequoialabs corn • Delta Environmental Consultants(Cameron Park) Project ARCO 2186, Stockton,CA 3330 Cameron Park Dr Ste 550 Project Number N/A Reported Cameron Park CA,95682 Project Manager Jay Johnson 07/05/01 12 49 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW1-40' (5106354-01)Water Sampled 06121/0109 34 Received 06/21/01 11 10 Tert-butyl alcohol ND 14000 ug/l 142 86 1060132 07/01/01 07/01/01 EPA 8260E Methyl tert-butyl ether 28000 290 " Di-isopropyl ether ND 290 " Ethyl tert-butyl ether ND 290 " Tert-amyl methyl ether ND 290 Surrogate 1,2-Dzchloroethane-d4 10.5% 76-114 MW2-40' (S106354-02)Water Sampled 06/21/0107 10 Received 06/21/01 11 10 Tert-butyl alcohol ND 100 ug/1 1 1060126 06/28/01 06/28/01 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 _ rrogate 12-Dtchloroethane-d4 974% 76-114 W3-39'(5106354-03)Water Sampled 06/21/0107 52 Received 06/21/01 11 10 Tert-butyl alcohol ND 100 ug/l 1 1060126 06/28/01 06/29/01 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Surrogate 1,2-Dichloroethane-d4 94 8% 76-114 MW4-39' (5106354-04)Water Sampled 06/2110108 26 Received 06/21/01 11 10 Ter -butyl alcohol ND 500 ug/l 5 1060132 06/28/01 06/29/01 EPA 8260B Methyl tert-butyl ether 590 10 " Di-isopropyl ether ND 10 Ethyl tert-butyl ether ND 10 " Tert-amyl methyl ether ND 10 _ Surrogate 12-Dtchloroethane-d4 974% 76-114 " quota Analytical- Sacramento 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 Page4of10