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Sequoia <br /> 1551 Industrial Road <br /> se[li101a Sao Carlos 94070 <br /> (650)232-9600 <br /> Analytical www <br /> seq(650)232-9612612 <br /> www sequotatabs corn <br /> Gettler-Ryan/Geostrategies(I) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Tosco#4409, Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/03/02 10 10 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040064-EPA 5030B IP/TI <br /> LCS(2040064-BS2) Prepared&Analyzed 04/22/02 <br /> Methyl Cert-butyl ether 55 6 20 ug/l 500 111 70-130 <br /> Surrogate 1 2-Drchloroethane-d4 554 500 111 70-130 <br /> Surrogate Toluene-d8 510 " 500 102 70-130 <br /> Matrix Spike(2040064-MSI) Source L204083-07 - Prepared&Analyzed 04/19/02 - <br /> Methyl ten-butyl ether 498 20 ugll 500 ND 996 60-140 <br /> Surrogate 12-Drchloroethane-d4 540 500 108 70-130 <br /> Surrogate Toluene-d8 509 500 102 70-130 <br /> Matrix Spike Dup(2040064-MSDI) Source L204083-07 Prepared&Analyzed 04/19/02 <br /> Methyl tert-butyl ether 529 20 ug/l 500 ND 106 60-140 604 25 <br /> Surrogate 12-Drchloroethane-d4 555 500 111 70-130 <br /> Surrogate Toluene-d8 497 500 994 70-130 <br /> Batch 2040067-EPA 5030B IP/TJ <br /> Blank(2040067-BLKI) Prepared& Analyzed 04/22/02 <br /> Ethanol ND 500 ug[I <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-buty]ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> 'Pert-butyl alcohol ND 100 " <br /> Surrogate 12-Drchloroethane-d4 535 500 107 70-130 <br /> Surrogate Toluene-d8 499 500 998 70-130 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />