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Sequoia 1551 lndustnal Road <br /> San Carlos CA 94070 <br /> ' (650)232-9600 <br /> Analytical <br /> FAX(650)232-9612 <br /> www sequoialabs cam <br /> tler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 7 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 82601B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 2040064-EPA 5030B PIT <br /> Blank(2040064-BL)(I) Prepared&Analyzed 04/19/02 <br /> Ethanol ND 500 ugR <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl ten-butyl ether ND 20 " <br /> Methyl tett-butyl ether ND 20 " <br /> Teri-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1 1-Dwhloroethane-d4 536 500 107 70 130 <br /> Surrogate Toluene-0 493 300 986 70-130 <br /> Blank(2040064-BLK2) Prepared&Analyzed 04/22/02 <br /> Ethanol ND 500 ugA <br /> bromoethane ND 20 " <br /> chloroethane ND 20 " <br /> Di-isopropyl ether ND 20 „ <br /> Ethyl Cert-butyl ether ND 20 " <br /> Methyl tent-butyl ether ND 20 „ <br /> Tert-amyl methyl ether ND 20 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate 1 1-Dichloroethane-d4 53,5 500 107 70 130 <br /> Surrogate Toluene-0 499 500 998 70-130 <br /> LCS(2040064-BSI) Prepared&Analyzed 04/19/02 <br /> Methyi cert-butyl ether 518 2 0 ugA 500 104 70-130 <br /> Surrogate 1 1-Dichloroethane-d4 531 500 106 70-130 <br /> Surrogate Toluene-d8 Sl 5 .500 103 70-130 <br /> �ta Analytical-San Carlos The results in chis 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 13 of 16 <br />