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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> TWOAnalytical (550)232-9600 <br /> FAX(650)232-9612 <br /> www.sequoialabs.com <br /> "ir__-%ettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 747 Sierra Court,Suite J Project Number: Tosco#11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 02/21/02 08:17 <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 2020030-EPA 5030B JP/Tl <br /> LCS(2020030-BSI) _ Prepared_&Analyzed.02/08/02 <br /> Methyl tert-butyl ether 42.1 1.0 ugll 50.0 84.2 70-130 <br /> Surrogate: l,1-Dichloroethane-d4 53.0 50.0 106 70-130 <br /> Surrogate:Toluene-d8 47.3 50.0 94.6 70-130 <br /> LCS(2020030-BS2) Prepared&Analyzed:02/11/02 <br /> Methyl tert-butyl ether 41.8 1.0 ugll 50.0 83.6 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 52.6 50.0 105 70-130 <br /> Surrogate:Toluene-d8 46.5 50.0 93.0 70-130 <br /> LCS(2020030-BS3) Prepared&Analyzed:02/12/02 <br /> Methyl tert-butyl ether 45.3 1.0 ug/I 50.0 90.6 70-130 <br /> Surrogate:l,1-Dichloroethane-d4 54.4 50.0 109 70-130 <br /> Surrogate: Toluene-d8 47.4 50.0 94.8 70-130 <br /> rtx Spike(2020030-MSI) Source:L202058-07 Prepared&Analyzed:02/08/02 <br /> wfcthyl tert-butyl ether 43.6 1.0 ug/l 50.0 1.5 84.2 60-140 <br /> Surrogate: l,2-Dichloroethane-d4 55.8 50.0 111 70-130 <br /> Surrogate:Toluene-d8 46.3 50.0 92.6 70-130 <br /> Matrix Spike Dup(2020030-MSD1) _ Source:L202059-07 Prepared&Analyzed:02/08/02 <br /> Methyl ter(-butyl ether 46.6 1.0 ug(I 50.0 1.5 90.2 60-140 6.65 25 <br /> Surrogate:l,2-Dichloroethane-d4 58.0 50.0 116 70-130 <br /> Surrogate:Toluene-d8 45.8 50.0 91.6 70-130 <br /> Batch 2020039-EPA 5030B JP/Tl <br /> Blank(2020039-BLKI) Prepared&Analyzed_:02/12/02 <br /> Ethanol ND 500 ug/l <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 tent-butyl ether ND 1.0 ! <br /> Teri-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 /> 1 <br /> 5.�: ` is Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain 1 <br /> • I <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> IG <br /> h <br /> Page 11 of 17 <br /> N <br />