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R1 i <br /> 819 Striker Ave Ste& <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921 0100 <br /> Amok www segaoialabs com <br /> ECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA S304255 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 08 52 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1R(5304255-01)Water Sampled 94/07/03 16 42 Received 04/09/03 17 20 <br /> Tert-butyl alcohol 130 100 ugll 1 3040319 04/18/03 04/18/03 EPA 8260B <br /> Methyl tert-butyl ether 73 2 0 " <br /> Di-isopropyl ether ND 2 0 ' <br /> Ethyl tert-butyl ether r ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> 1,2-Dibromoethane(EDB) ND 20 " <br /> Surrogate 12-DCA-d4 134% 60-140 <br /> MW-2R S304255-02 Water Sampled 04/07/03 13 40 Received 04/09/03 17 20 <br /> Tert-butyl alcohol 8200 5000 ugll 50 3040319 04/18/03 04/18/03 EPA 8260B <br /> Surrogate 1 2-DCA-d4 128% 60-140 " <br /> MW-2R S304255-02RE1 Water Sam led 04/07/03 13 40 Received 04/09/03 17 20 <br /> 0 ethyl tert-butyl ether 160 10 ugll 5 3040335 04/21/03 04/21/03 EPA 8260B <br /> -isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> Ethanol ND 2500 " <br /> 1,2-Dichloroethane ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 10 " <br /> Surrogate 1 2-DCA-d4 123% 60-140 " <br /> MW-3(5304255-03)Water Sampled 04/07/03 16 05 Received 04/09/03 17 20 <br /> Tert-butyl alcohol ND 100 ugtl 1 3040319 04/18/03 04/18/03 EPA 8260B <br /> Methyl tert-butyl ether 160 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane NA 20 " <br /> 1,2-Dibromoethane(EDB) ND 20 <br /> Surrogate 1 2-DCA-d4 126% 60-140 " <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> 49 basis This analytical report must be reproduced in its entirety <br /> Page 7 of 19 <br />