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Sequoia 819 SenAve Ste 8 <br /> Sacramentoto,,CA 95834 <br /> a— ) (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequmalabs corn <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 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120101-EPA 5030B[P/TJ <br /> Blank(2120101-BLK11 Prepared&Analyzed 12/05/02 <br /> Ethanol ND 50 ug/l <br /> Tert-butyl alcohol ND 5 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Tert-amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 <br /> 1,2-Dtbromoethane(EDB) ND 0 50 " <br /> Benzene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> asoline(C6-CIO) ND 50 " <br /> Surrogate Toluene-d8 265 25 0 106 60-140 <br /> Surrogate 4-BFB 306 25 0 122 60-140 <br /> Surrogate 12-DCA-d4 272 15 0 109 60-140 <br /> Blank 2120101-BLK2 Prepared&Analyzed 12/06/02 <br /> Ethanol ND 50 ug/l <br /> Tert-butyl alcohol ND 5 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Dr-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> Benzene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate Toluene-d8 271 25 0 109 60-140 <br /> Surrogate 4-BFB 290 25 0 116 60-140 <br /> Sequoia Analytical-Sacramento The results to 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 7 of 10 <br />