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_Sequoia 819 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> r� <br /> Analytical (916)9219600 <br /> FAX(916)921 4100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA 5211698 <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/12/03 12 10 <br /> BTEX by EPA Method 826OB <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-15(5111698-03)Water Sampled 1112-102 06 35 Received. 11/22/02 09 15 <br /> Ethanol ND 50 ugll 1 2120101 12/05/02 12/05/02 EPA 8260B <br /> Tert-butyl alcohol 17 50 <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " ^ <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Ethylbenzene ND 050 ^ <br /> Toluene 14 050 <br /> Xylenes(total) 17 050 <br /> Gasoline(C6-C10) ND 50 ^ <br /> Surrogate Toluene-d8 106% 60-140 " <br /> Surrogate 4-BFB 122% 60-140 <br /> Surrogate 12-DCA-d4 110% 60-140 " <br /> 211698-04 Water Samplfd 11/21/02 06 40 Received, 1 22 02 09 15 <br /> Ethanol ND 50 ug/l 1 2120101 12/05/02 12/05/02 EPA 8260B <br /> Tert-butyl alcohol ND 50 <br /> Methyl tert-butyl ether 17 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Ethylbenzene ND 050 <br /> Toluene 063 050 <br /> Xylenes(total) 062 050 <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate Toluene-d8 107% 60-140 " <br /> Surrogate 4-BFB 121% 60-140 " <br /> Surrogate 12-DCA-d4 109% 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 4 of 10 <br />