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404 N Wlget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9£i00 <br /> FAX(925)988-9673 <br /> Analytical _ www sequolalabs corn <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Handing 06-Jun-01 08 21 <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 Uruts Level Result %REC Limits RPD Limit Notes <br /> Batch 1E23005-EPA 5030B(PM <br /> Blank(1E23005-BLK1) Prepared&Analyzed 23-May-01 <br /> Ethanol ND 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tent-butyl ether ND 20 " <br /> Ds-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 467 500 934 so-ISO <br /> Surrogate 1 2-DrcNoroethane-d4 513 500 103 50-150 <br /> Blank(1E23005-BLK2) Prepared&Analyzed 25-May-01 <br /> Ethanol ND 500 ug/l <br /> te -Butyl alcohol ND 20 <br /> 1 tert-butyl ether ND 20 <br /> Ds-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromeihane 455 SO 0 910 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 486 500 972 50-150 <br /> LCS(1E23005-BSI) Prepared&Analyzed 23-May-01 <br /> Methyl tett-butyl ether 436 20 ugA 500 872 70-130 <br /> Surrogate Dibromofluorvmeihane 434 500 868 50-150 <br /> Surrogate 1 2 Dtchloroethane-d4 447 500 894 50-150 <br /> LCS(IE23005-BS2) Prepared&Analyzed 25-May-01 <br /> Methyl tert-butyl ether 406 20 ug/1 500 812 70-I30 <br /> Surrogate Dibromofluoromethane 419 500 838 SO-150 <br /> Surrogate 1 2-Diehloroethane-d4 516 500 103 50-150 <br /> I <br /> i <br /> oia 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 /> Page 8 of 12 <br />