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404 N Wiget Lame <br /> Sequoia Walnut Greek CA 94598 <br /> 4 (925)988-9600 <br /> FAX(925)988-9673 <br /> rDubhAnalytical www sequoialabs corn <br /> n <br /> ler Ryan,Inc -Dublin Project Chevron <br /> Sierra Couri Suite J Protect Number Chevron# 9-6258 Reported <br /> CA,94568 Project Manager Deanna L Harding 30 <br /> Volatile <br /> 1 l 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Ltmrt Units Level Result %REC Lunits RPD Lunit Notes <br /> Batch ID18014-EPA 5030B(Pffl <br /> Blank(1D18014-BLKI) Prepared&Analyzed 18-Apr-01 <br /> Ethanol ND 500 ug/I <br /> tert-Butyl alcohol ND 50 " <br /> Methyl test-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluoromerhane 710 500 141 50-150 <br /> Surrogate 1 1-Duhloroeihone-d4 510 500 101 50-150 <br /> Blank(1D18014-BLK2) Prepared&Analyzed 19-Apr-01 <br /> Ethanol ND 500 ug/1 <br /> Butyl alcohol ND 50 <br /> ryl tent-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Debromofluoromethane 510 500 101 50.150 <br /> Surrogate 11-Dochloroethane-d4 440 " 500 880 50-150 <br /> Blank(IDI8014-BLK3) Prepared&Analyzed 23-Apr-01 <br /> Ethanol ND 500 ug/I <br /> tert-Butyl alcohol ND 50 " <br /> Methyl tent-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluoromethane 550 " 500 110 50-150 <br /> Surrogate 12 Dichloroerhane-d4 430 500 860 50-150 <br /> Ola Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the churn of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 6 of 11 <br />