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8W (916) 19 Straker Avenue Suite 8 Sequoia Sacramento CA 95834 921-9600 Analytical FAX(916)921 0100 www sequoialabs com SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA 3017 Kilgore Road,Suite 100 Project Number N/A Reported Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 01/23/02 17 08 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical- Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW- 201152-01 Water Sampled 01/07/02 15 35 Received 01109/02 13 1 Tert-butyl alcohol ND 50 ug/l 1 2010188 01/15/02 01/16/02 EPA 82605 Methyl tert-butyl ether ND 050 Di-isopropyl ether ND 050 ^ Ethyl tent-butyl ether ND 050 ^ Tert-amyl methyl ether ND 050 Ethanol ND 50 " ^ 1,2-Dichloroethane ND 050 " Ethylene dibromide ND 050 Surroeate 1 2-DCA-d4 104% 60-140 MW-6 5201152-02 Water Sam led 01/07/02 15 22 Received 01/09/02 13 10 Tert-butyl alcohol ND 50 ug/l 1 2010188 01/15/02 01/16/02 EPA 82605 Methyl tert-butyl ether ND 050 Di-isopropyl ether ND 050 ^ (thyl tert-butyl ether ND 050 ert-amyl methyl ether ND 050 Ethanol ND 50 " ^ 1,2-Dichloroethane ND 050 " Ethylene dibromide ND 050 " Surrogate 1 2-DCA-d4 956% 60-140 " MW-7(S201152-03)Water Sampled 01/07/02 15 50 Received 01/09/02 13 1 Tert-butyl alcohol ND 50 ug/l 1 2010188 01/15/02 01/16/02 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 Ethanol ND 50 1,2-Dichloroethane ND 050 " Ethylene dibromide ND 050 ^ " Surrogate 12-DCA-d4 110% 60-140 " Sequoia 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 Page Page 3 of 6