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404 N Wiget lane <br /> 1• Walnut Creels CA 94598 <br /> Sequoia (925)988-9600 <br /> ( 4 FAX(925)988-9673 <br /> D_ Analytical www sequoialabs com <br /> VO <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite j Project Number Chevron# 9-8632 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 16-Aug-01 08 08 <br /> MTBE Confirmation 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 Notes <br /> Batch 1H07010- EPA 5030B(P/T) <br /> Matrix Spike(IH07010-MSI) Source W107521-02 Prepared&Analyzed 08-Aug-01 <br /> Methyl tert-butyl ether(MTBE) 464 20 ug/1 500 ND 928 60-150 <br /> Surrogate Dibromofiuoromethane 46 0 500 920 50-150 <br /> Surrogate I 1-Dichloroethane-d4 500 <br /> 50 0 100 50 150 <br /> Matrix Spike Dup(IH07010-MSDI) Source W107521-02 Prepared&Analyzed 08-Aug-01 <br /> Methyl tert-butyl ether(MTBE) 563 20 ug/1 500 ND 113 60-150 193 25 <br /> Surrogate Dibromofluoromethane 500 500 100 50-150 <br /> Surrogate 12-Dichloroethane-d4 520 500 104 50-150 <br /> la Analytical- Walnut Creels 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 /> Page 12 of 14 <br />