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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> NW Analytical FAX(650)232-9612 <br /> - www.sequoialabs.corn <br /> Gott]er-Ryan/GeostrateRies(1) Project: Tosco(1) . <br /> 6747 Sierra Court,Suite J Project Number: Tosco#/11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 02/21102 08:17 <br /> Volatile Organic S 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 2020030-EPA 5030B JP/TJ <br /> Blank(2020030-BLKI) Prepared&Analyzed: 02/08/02 _ <br /> Ethanol ND 500 ug11 <br /> 1,2-Dibromoethane ND 1.0 <br /> 1,2-Diehl oroethane ND 1.0 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate: l,2-Dichloroethane-d4 53.1 50.0 106 70-130 <br /> Surrogate: Toluene-dS 49.6 50.0 99.2 70-130 <br /> Blank(2020030-BLK2) _ _. Prepared&Analyzed:02/11/02_ <br /> Ethanol ND 500 ug4 <br /> 1,2-Dibromoethane ND 1.0 <br /> 1,2-Dichloroethane ND 1.0 , <br /> Di-isopropyl ether ND 1.0 <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 1.0 " <br /> Tort-amyl methyl ether ND 1.0 " <br /> Teri-butyl alcohol ND 20 " <br /> Surrogate:1,2-Dichloroethane-d4 50.5 50.0 101 70-130 <br /> Surrogate: Toluene-d8 48.9 50.0 97.8 70-130 <br /> Blank(2020030-BLK3) Prepared&Analyzed:02/12/02 _ <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 1.0 " <br /> 1,2-Dichloroethane ND 1.0 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethyl ter[-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate:l,2-Dichloroethane-d4 53.3 50.0 107 70-130 <br /> Surrogate: Toluene-d8 50.0 50.0 100 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the cfi 'j <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page 10 of 17 <br />