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885 Jar+ns Dr a_ _� Sequoia Morgan Hill,CA 95037 (408)776-9600 Analytical FAX(408)782-6308 www mquoialabs can Stratus Environmental Inc Project ARCO#2130 MLL0778 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported Cameron Paris CA,95682 Project Manager Jay Johnson 01/08/03 1149 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical-Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MWI(MLL0778.01)Water Sampled 12/18/020000 Received 12/19/02 15 55 Tert-butyl alcohol ND 5 0 ug/1 1 2120497 12/31/02 12/3I/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-DCA-d4 113% 60-140 " MW-2(MLL0778-02)Water Sampled 12/18/02 00 00 Received 12/19/02 15 55 Tert-butyl alcohol ND 5 0 ug/1 1 2120497 12/31/02 12/31/02 EPA 826013 Methyl tert-butyl ether 25 050 " Di-isopropyl ether ND 050 " Ethyl tert-butyl ether ND 050 " Tert-amyl methyl ether ND 050 " Surrogate 12-DCA-d4 94% 60-140 " MW-3(MLL0778-03)Water Sampled 12/18/02 00 00 Received 12/19/02 15 55 Tert-butyl alcohol ND 50 ug/l 1 3010010 01/01/03 01/01/03 EPA 8260B Methyl tert-butyl ether ND 050 Di-isopropyl ether ND 050 " Ethyl cert-butyl ether ND 050 " Tert-amyl methyl ether ND 050 " Surrogate 1,2-DCA-d4 129% 60-140 " MW4(MLL0778-04)Water Sampled 12/18/020000 Received 12/19/02 15 55 Tert-butyl alcohol ND 5 0 ug/1 1 2120497 12/3I/02 12/31/02 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-DCA-d4 114% 60-140 " Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of • custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced on its entirety Page 5 of I I