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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> Analtical (650)232-9600 <br /> Y FAX(650)232-9612 <br /> www.sequoialabs.com <br /> Gettler-Ryan/Geostratepies(I) Project: Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number: Tosco#111 195 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 Leel Result %REC Limits RPD Limit Notes <br /> Batch 2020039-EPA 5030B JP/Tl <br /> Blank(2020039-BLK2) Prepared&Analyzed:02/13/02 <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 Cert-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 " <br /> Tert-butyl alcohol ND 20 rr <br /> Surrogate: 1,1-Dichloroethane-d4 51.3 50.0 103 70-130 <br /> Surrogate: Toluene-d8 47.8 50.0 95.6 70-130 <br /> LCS(2020039-BSI) Prepared&Analyzed:02/12/02 <br /> Methyl tert-butyl ether 45.3 1.0 ugtl 50.0 90.6 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 54.4 50.0 109 70-130 <br /> Surrogate: Toluene-d8 47.4 50.0 94.8 70-130 = ' <br /> LCS(2020039-BS2) Prepared&Analyzed:02/13/02 _ <br /> Methyl ter[-butyl ether 47.0 1.0 ug/l 50.0 94.0 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 51.9 " 50.0 104 70-130 <br /> Surrogate:Toluene-d8 47.4 50.0 94.8 70-130 <br /> Matrix Spike(2020039-MSI) Source:L202068-06 Prepared&Analyzed:02/12/02 _ <br /> Methyl tert-butyl ether 48.2 1.0 ugfl 50.0 ND 96.4 60-140 <br /> Suri-ogate: l,2-Dichloroethane-d4 56.9 50.0 114 70-130 <br /> Surrogate: Toluene-d8 47.2 50.0 94.4 70-130 <br /> Matrix Spike Pup(2020039-MSD1) Source: L202068-06 Prepared&Analyzed:02/12/02 _ <br /> Methyl tert-butyl ether 46.1 1.0 ug/1 50.0 ND 92.2 60-140 4.45 25 <br /> Surrogate:l,2-Dichloroethane-d4 56.6 50.0 113 70-130 <br /> Surrogate: Toluene-d8 47.7 50.0 95.4 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chi`<<; <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page 12 of 17 <br />