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Sequoia Walnut <br /> N. Lane <br /> #Creek,,CA CA 94598 <br /> 12) <br /> (925)988-9600 <br /> Analytical vvFAX(925)988-9673 <br /> Vp wwsequoialabs.com <br /> Gettler Ryan, Inc.-Dublin Project: Tosco <br /> 6747 Sierra Court Suite.l Project Number: Tosco# 11195 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 1 i-Mar-02 07:42 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 2B26016-EPA 5030)3(P/`I) <br /> LCS(2B26016-BS2) Prepared&Analyzed:27-Feb-02 <br /> Methyl ter[-butyl ether(NYSE) 42.6 2.0 ug/l 50.0 85 70-130 <br /> Surrogate:DibromoJluoromethane 49.6 50.0 99 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 44.3 50.0 89 50-150 <br /> Matrix Spike(2B26016-MSI) Source:W202310-01 Prepared&Analyzed:26-Feb-02 <br /> Methyl tent-butyl ether(MTBE) 51.3 2.0 ug/1 50.0 ND 103 60-150 <br /> Surrogate;Dibromofluoronrethane 48.4 " 50.0 97 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 49.5 50.0 99 50-150 <br /> Matrix Spike Dup (2B26016-MSDI) Source:W202310-01 Prepared&Analyzed:26-Feb-02 <br /> Methyl Cert-butyl ether(MTBE) 57.0 2.0 ugll 50.0 ND 114 60-150 11 25 <br /> i---!1-rogate:Dibromofluorowethane 49.0 50.0 98 50-150 <br /> > .a'rogate: 1,2-Dichloroethane-d4 49.5 50.0 99 50-150 <br /> c: <br /> Analytical - Walnut Creek 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 entirety. <br /> 9 01 10 <br /> �C9 I <br />