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404 N Wiget Lane ,, <br /> Sequoia Walnut Geek C8 94598 <br /> (925)988-9 <br /> 4 1 FAX(925)988-%73 <br /> _ Analytical wwwsequoialabsCorn <br /> , <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-6171 Reported <br /> Dubhn CA,94568 Project Manager-Deanna 17-Harding 06=Mar-01-12 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> - Sequoia Analytical - Walnut Creek - <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1B27013-EPA 5030B [PIT] - <br /> Blank(IB27013-BLKI) Prepared 27-Feb-01 Analyzed 28-Feb-01 <br /> Ethanol ND 500 ugll <br /> tent-Butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 <br /> Di-tsopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> fi <br /> 1.2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 <br /> Surrogate Dubromofluoromethane 514 500 103 50-150 <br /> Surrogate 1 2 Drchlorcethane-d4 41 7 500 834 50-150 <br /> Blank(1B27013-BLK2) - Prepared&Analyzed 28-Feb-01 <br /> Ethanol ND 500 ug/1 <br /> tort-Butyl alcohol , ND 50 " <br /> Methyl text-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tint-butyl ether _ - —: — _ _ NDS_ — 20 <br /> tert-Amyl methyl ether ND. 20 „ <br /> 1,2-Dtchloroethane, ..— -_ _ N _ --ND�- r_2 0 <br /> Ethylene dibronude ND 20 " <br /> Surrogate Dtbromofluonomethane .480 500 960 50-150 <br /> Surrogate 1,2-Dtchloroethane-d4 420 500 840 150-150 <br /> LCS(IB27013-BSI) Prepared 27-Feb-01 Analyzed 28-Feb-01 <br /> Methyl tent-butyl ether 414 20 ugll 500 82 8 70-130 <br /> Surrogate Dtbromofluoromethane 503 500 101 50-150 <br /> Surrogate 1 2-Dichlaroethane-d4 412 500 824 50-150 <br /> Sequoia Analytical-Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain <br /> custody document Thus analytical report must be reproduced to its entire <br /> Page 7 of 11 <br />