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404 N Wiget Lane <br /> Walnut Geek,CA 94598 <br /> ID <br /> Sequoia FAX(925)986-9[600 <br /> Analytical www sequolalabs`°m <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 Harding 10-Jan-01 08 10 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lrmat Units Level Result %REC Lunits RPD Lrnut Notes <br /> Batch OL22010-EPA 5030B [PIT] <br /> Blank(OL22010-BLK1) Prepared&Analyzed 19-Dec-00 <br /> Ethanol ND 500 ugJl <br /> tert-Butyl alcohol ND 50 " <br /> Methyl tort-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> telt-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 460 500 92-0 50-150 <br /> Surrogate 1,2-Dichloroerhane-d4 400 500 800 50.150 <br /> Blank(OL22010-BLK2) Prepared&Analyzed 22-Dec-00 <br /> Ethmtol ND 500 vg/l <br /> tett- 1 alcohol ND 50 " <br /> Mit-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 11 <br /> Ethyl tert-butyl ether ND 20 " <br /> tertrAmyl methyl ether ND 20 " <br /> Swwgate Dibromofhioromethane 460 300 92.0 50-150 <br /> Swmgare 42-Dichloroethane-d4 410 Soo 810 50-150 <br /> Blank(OL22410-BLK3) Prepared&Analyzed 04-Jan-01 <br /> Ethanol ND 500 ug/l <br /> tort-Butyl alcohol ND 50 " <br /> Methyl teat-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tart-Amyl methyl ether ND 20 " <br /> Savrogate Dibromofiuoromethane 460 500 920 50-150 <br /> Surrogate 1,2 Drchloroethane-d4 360 500 720 50.150 <br /> S a Analytical-Walnut Creek The results in this report apply to the samples arialwed in accordance with the chain of <br /> custody document.Thus ar abmcal report must be reproduced in its entirety <br /> Page 6 of 13 <br />