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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> a- ) (650)232-9600 <br /> qW Analytical FAX(650)232-9612 <br /> WWW.Sequoialabs.com <br /> ( <br /> "-*tler-Ryan/Geostrategies(1) Project: Tosco 1) <br /> `:�7 Sierra Court,Suite J Project Number. Tosco#11195,Lathrop,CA Reported: <br /> : <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <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 1110100-EPA 5030B IP/TJ <br /> Blank(1170100-BLK2) Prepared&Analyzed: 11/29/01 <br /> Ethanol ND 500 ugll <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 ten-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 " <br /> Teri-butyl alcohol ND 20 " <br /> Surrogate:1,1-Dichloroethane-d4 25.1 25.0 100 70-130 <br /> Surrogate:Toluene-d8 23.8 10 25.0 95.2 70-130 <br /> LCS(I 110100-BSI) Prepared&Analyzed: 11/28/01 <br /> Methyl tert-butyl ether 56.1 1.0 ug/I 50.0 112 70-130 <br /> ale:1,2-Dichloroethane-d4 26.5 15.0 106 70-130 <br /> §zrr-...'agate:Toluene-& 24.7 " 25.0 98.8 70-130 <br /> LCS(l l 10100-BS2) Prepared&Analyzed: 11/29/01 <br /> Methyl tert-butyl ether 50.7 1.0 ug/1 50.0 101 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 27.1 25.0 109 70-130 <br /> Surrogate:Toluene-d8 24.7 25.0 98.8 70-130 <br /> Matrix Spike(II10100-MSI) Source:L111140-10 Prepared: 11/28/01 Analyzed: 11/29/0) <br /> Methyl tert-butyl ether 46.2 1.0 ug/I 50.0 ND 92.4 60-140 <br /> Surrogate:1,2Dichloroelhane-d4 23.7 25.0 94.8 70-130 <br /> Surrogate:Toluene-d8 24.1 25.0 96.4 70-130 <br /> Matrix Spike Dup(1110100-MSDI) Source:L111140-10 Prepared: 11/28/01 Analyzed: 11/29/01 <br /> Methyl tert-butyl ether 47.6 1.0 ug/I 50.0 ND 95.2 60-140 2.99 25 <br /> Surrogate:l,2-Dichloroethane-d4 24.3 25.0 97.2 70-130 <br /> Surrogate:Toluene-& 24.6 25.0 98.4 70-130 <br /> Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirely. <br /> E <br /> Page 15 of 18 h <br />