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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> Analytical (650)232.9600 <br /> FAX(650)232-9612 <br /> www.sequDiniabs.corn <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 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 2020045-EPA 5030B lP/Tl <br /> LCS(2020045-BS2) Prepared&Analyzed:02/14/02 <br /> Methyl tert-bulyl ether 44.7 1.0 ugfl 50.0 89.4 70-130 <br /> Sur•rogate: l,2-Dichloroethane-d4 57.0 " 50.0 114 70-130 <br /> Surrogate: Toluene-d8 46.2 " 50.0 92.4 70-130 <br /> Matrix Spike(2020045-MSI) Source:L202068-12 Prepared&Analyzed:02/13/02 _ <br /> Methyl tert-butyl ether 48.4 1.0 ugll 50.0 ND 96.8 60-140 <br /> Surrogate: l,1-Dichloroethane-d4 56.8 50.0 114 70-130 <br /> Surrogate: Toluene-d8 46.7 50.0 93.4 70-130 <br /> Matrix Spike Dup(2020045-MSDI) Source:L202068-12 Prepared&Analyzed:02/13/02 <br /> Methyl tert-butyl ether 49.9 1.0 ug4 50.0 ND 99.8 60-140 3.05 25 <br /> Surrogate. l,2-Dichloroethane-d4 57.1 H 50.0 114 70-130 <br /> Surrogate: Toluene-d8 46.1 50.0 91.2 70-130 <br /> i <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the <br /> of custody document. This analytical report must be reproduced in its entirety. — <br /> Page 14 of 17 i <br /> r <br /> Y <br />