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404 N Wlget Lane <br /> Sequoia Walnut Geek,CA 94598 <br /> 4 a- ) (925)988-96Q0 <br /> FAX(925 %8-9073 <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 10-Jan-01 08 10 <br /> Volatile Organic Compounds by EPA Method 8260B - QuaIity Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lurut Units Level Result %REC Limits RPD Limit Notes <br /> Batch OL22010-EPA 5030B [PIT] <br /> Blank(OL22010-BLK4) Prepared&Analyzed 08-Jan-01 <br /> Ethanol ND 500 ug/l <br /> tent-Butyl alcohol ND 50 " <br /> Methyl tort-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl text butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 470 500 940 50-ISO <br /> Surrogate 1 2-Dichloroethane-d4 390 500 780 50.150 <br /> LCS(01,22010-BS1) Prepared&Analyzed 19-Dec-00 <br /> Methyl tat-butyl ether 351 20 ug/l 500 702 70-130 <br /> Surrogate Drbromofluoromethane 460 500 910 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 - - 380 - 500 -76.0 50.150 - - <br /> LCS(OL22010-BS2) Prepared&Analyzed 22-Dec-00 <br /> Methyl telt-butyl ether 390 20 ug/1 500 780 70-130 <br /> Surrogate_Dibrua uoromethone 46_0_- _ _ _ ____" _ _ __ 500 _ _910 50-150_ <br /> Surrogate I 1-Dtchloroethane-d4 410 500 810 50-150 <br /> LCS(OL22010-BS3) -- — Prepared&Analyzed 04-Jan-01— - - <br /> Methyl Seri-butyl ether 500 20 ug/1 500 100 70-130 <br /> Surrogate Dibromofluoromeduvre 470 500 940 50.150 A <br /> Surrogate I 1-Dichloroethane-d4 360 500 710 50-150 <br /> LCS(OL22010-BS4) Prepared&Analyzed 08-Jan-01 <br /> Methyl text-butyl ether 413 20 ug/I 500 826 70-130 <br /> Surrogate Dtbromofluoromethane 480 500 960 50.150 <br /> Surrogate I,1-Dichlaroethaiw-d4 380 500 760 50.150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the sampler wwl5wed in accordance with the chcu� <br /> custody documru Deus analytical report must be reproduced to its enh <br /> Page 7 of 13 <br />