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404 N Wiget Lane <br /> Sequoia Walnut Creek C94598 <br /> 4 (925)988 8-9600 <br /> Analytical FAX equo alabs c 73 <br /> www sequoialabs com <br /> Gettler Ryan, Inc - Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#1 9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L }larding 07-Aug-01 IS 35 <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 Notes <br /> Batch 1 H03014- EPA 5030B(PIT) <br /> Blank(IH03014-BLKI) Prepared &Analyzed 03-Aug-01 <br /> Ethanol -_-- ND 500 UO —�� --- - <br /> tert-Butyl alcohol ND 20 <br /> Methyl Cert-butyl ether ND 20 " <br /> DI-isopropyl ether ND 20 " <br /> Ethyl ten-butyl ether AID 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 491 500 _ 982 50-150 <br /> Surrogate 12-Dichlaroethane-d4 500 500 100 50-150 <br /> LCS(1H03014-BSI) Prepared&Analyzed 03-Aug-01 <br /> Methyl tert-butyl ether _ 551 v 20 ug/I 500 1 10 70-130 <br /> Surrogate Dibromofluoromethane 331 500 106 50-150 <br /> gate 1 2-Dichloroeihane-d4 487 500 974 50-150 <br /> Matrix Spike(1H03014-MSI) Source W107444-01 Prepared&Analyzed 03-Aug-01 <br /> Methyl tert-butyl ether 507 20 ug/1 500 ND 101 60-150 <br /> Surrogate Dibromofluoromethane 490 300 980 50-150 <br /> Surrogate 12-Dichloroethane-d4 539 500 108 50-150 <br /> Matrix Spike Dup(IH03014-MSDI) Source W107444-01 Prepared&Analyzed 03-Aug-01 <br /> Methyl terl butyl ether 57 2 F 20 ug/I 500 ND 114 60-150 120 25 <br /> Surrogate Dibromofluoromethane 535 500 107 50-150 <br /> Surrogate 12-Dichloroerhane-d4 544 500 109 50-150 <br /> S oia Analytical -Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 8 of 10 <br />