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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> ID (916)921-9600 <br /> Analytical FAX(916)921 0100 <br /> www sequoialabs com <br /> W--nte.matIonal -Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 06/14/02 1128 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> GP-3(5206079-13)Water Sampled 06/05/02 12 20 Received 06/06/02 17 35 <br /> Ethanol ND 1000 ug/1 20 2060151 06/13/02 06/14/02 EPA 8260B <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tert-butyl ether ND 10 " <br /> Di-isopropyl ether ND 16 <br /> Ethyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 <br /> 1,2-Dichloroethane ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 10 " <br /> Benzene ND 10 " <br /> Ethylbenzene 310 10 " <br /> Toluene ND 10 <br /> Xylenes(total) 140 I0 <br /> Gasoline(C6-C10) 4100 1000 <br /> Surrogate Toluene-d8 103 % 60-140 " <br /> Surrogate 4-BFB 124% 60-140 " <br /> *urrogate 1 2-DCA-d4 104% 60-140 <br /> GP-4(5206079-14)Water Sampled 06/05/02 13 35 Received 06/06/02 17 35 ,R <br /> Ethanol ND 50 ug/1 1 2060151 06/13/02 06/14/02 EPA 8260B <br /> Tert-butyl alcohol ND 50 <br /> Methyl tert-butyl ether ND 050 " <br /> Dr-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 <br /> Tert-amyl methyl ether ND 050 " <br /> 112-Dichloroethane ND 050 " <br /> I,2-Dibromoethane(EDB) ND 0 50 " <br /> Benzene ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate Toluene-d8 102% 60-140 " <br /> Surrogate 4-BFB 127% 60-140 " <br /> Surrogate 1,2-DCA-d4 110% 60-140 " <br /> Sequoia Analytical-Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 12 <br />