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404 N Wiget Lane <br /> Walnut Creek,CA 94598 <br /> S e qu o 1 a (925)988-9600 <br /> 4FAX(925)988-%73 <br /> Analytical www sequolala com <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron 49-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 21-Nov-00 07 54 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical w Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmut Umts Level Result %REC Limits RPD Linut Notes <br /> Batch OK08027-EPA 5030B[PIT] <br /> Blank(OK08027-BLKI) Prepared&Analyzed 08-Nov-00 <br /> Ethanol ND 500 ug/l <br /> Cert-Butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-Lsopropyi ether ND 20 <br /> Ethyl tent-butyl ether ND 20 " <br /> tent-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluouamethone 500 500 100 50-150 <br /> Surrogate 12-Dichloroethane-d4 500 500 100 50-150 <br /> Blank(OK08027-BLK2) Prepared&Analyzed 09-Nov-00 <br /> Ethanol ND 500 ug/l <br /> tert Butyl alcohol ND 50 " <br /> tcrt-butyl ether ND 20 <br /> D oPropyl <br /> ether ND 20 <br /> Ethyl telt-butyl ether ND 20 " <br /> lett-Amyl methyl ether ND 20 „ <br /> Surrogate Dibromofluoromethane 510 500 102 50.150 <br /> Surrogate 1,2-Dichloroethane-d4 520 Soo 104 50-150 <br /> LCS(OK08027-BS1) Prepared&Analyzed 08-Nov-00 <br /> Methyl tart-butyl ether 511 20 ug/I 500 102 70-130 <br /> Surrogate Dibromofluoromedhane 4&0 500 960 50-150 <br /> Surrogate 1,2 Dichloroedane-d4 Soo 500 100 so-Iso <br /> LCS(OK08027 EM) Prepared&Analyzed 09-Nov-00 <br /> Methyl.trr-butyl ether 411 20 ueA Soo 822 70-130 <br /> Surrogate Dibromofluorumedhana 500 500 100 50-150 <br /> Surrogate 12Dchloroetkww-d4 500 Soo 100 50-150 <br /> S la Analyt cal-Walnut Creek The results in thus report apply to the samples analpred in accordance with the chain of <br /> custody document Tins analytical repor7 mast be reproduced to its entirety <br /> Page 6 of 11 <br />