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4 Sequoia <br />4p%o- Analytical <br />404 N Wlget Lane <br />Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs corn <br />Gettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 25 -Jul -00 10 44 <br />Volatile Organic Compounds by EPA Method 8260A - 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 0GO8002 - EPA 5030B [PIT] <br />Blank (OG08002-BLK2) <br />Prepared & Analyzed 08 -Jul -00 <br />Dichlorodifluoromethane <br />ND <br />20 ug/I <br />Chloromethane <br />ND <br />20 " <br />Vinyl chloride <br />ND <br />20 " <br />Bromomethane <br />ND <br />so " <br />Chloroethane <br />ND <br />20 <br />Trichlorofluoromethane <br />ND <br />20 <br />IJ Dcrhloroethene <br />ND <br />20 " <br />Methylene chlonde <br />ND <br />10 " <br />Methyl tert-butyl ether <br />ND <br />20 <br />trans -1 2-Drchloroethene <br />ND <br />20 " <br />1,1-DILhloroethane <br />ND <br />20 " <br />2-Dcchloropropane <br />ND <br />50 <br />ccs -1 2 Drchloroethene <br />ND <br />20 <br />Bromochloromethane <br />ND <br />20 " <br />Chloroform <br />ND <br />20 " <br />1 l,l-Tnchloroethane <br />ND <br />20 " <br />Carbon tetrachionde <br />ND <br />20 " <br />1 l-Drchloropropene <br />ND <br />20 " <br />Benzene <br />ND <br />10 " <br />1,2 Dwhloroethane <br />ND <br />2 0 " <br />Trichloroethene <br />ND <br />20 " <br />1,2-Dcchloropropane <br />ND <br />2 0 " <br />Dlbromomethane <br />ND <br />20 <br />Bromodcchloromethane <br />ND <br />20 " <br />2,2,5,5 Tetramethyltetrahydrofuran <br />ND <br />20 <br />cis -1 3-Dichloropropene <br />ND <br />2 0 " <br />Toluene <br />ND <br />2 0 " <br />trans -1,3 Drchloropropene <br />ND <br />50 <br />1,1,2-Tnchioroethane <br />ND <br />2 0 " <br />Tetrachloroetherse <br />ND <br />2 0 " <br />1,3 Dcchloropropane <br />ND <br />2 0 " <br />Dcbromochloromethane <br />ND <br />20 " <br />1,2-Dtbromoethane <br />ND <br />2 0 <br />Chlorobenzene <br />ND <br />20 " <br />�equoia Analytical - Walnut Creek The results to tins report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />Page 20 of 25 <br />