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Sequoia <br />Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs cam <br />Reported <br />18 -Apr -00 11 39 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD 13012 -EPA 5030B [PIT] <br />Blank (OD13012-BLK2) <br />Prepared & Analyzed 13 -Apr -00 <br />Dichlorodifluoromethane <br />ND <br />20 ug/l <br />Chloromethane <br />ND <br />20 <br />Vinyl chloride <br />ND <br />050 <br />Bromomethane <br />ND <br />50 <br />Chloroethane <br />ND <br />20 <br />Tnchlorofluoromethane <br />ND <br />20 <br />1 l-Dichloroethene <br />ND <br />20 <br />Methylene chloride <br />ND <br />10 <br />trans -1 2-Dichloroethene <br />ND <br />20 <br />1 1-Dichloroethane <br />ND <br />20 <br />2,2-Dichloropropane <br />ND <br />50 " <br />cis- l2-Drchloroethene <br />ND <br />20 " <br />*om-chloromethane <br />ND <br />20 <br />Chloroform <br />ND <br />20 <br />1,1,1-Tnchloroethane <br />ND <br />20 " <br />Carbon tetrachlonde <br />ND <br />20 " <br />13-Dichloropropene <br />ND <br />20 <br />Benzene <br />ND <br />10 <br />1 2-Dichloroethane <br />ND <br />20 <br />Trichloroethene <br />ND <br />2 0 " <br />I 2-Dichloropropane <br />ND <br />20 " <br />Drbromomethane <br />ND <br />20 " <br />Bromodichloromethane <br />ND <br />2 0 " <br />2 2,5,5-Tetramethyltetrahydrofuran <br />ND <br />20 " <br />cis -1 3-Dichloropropene <br />ND <br />20 " <br />Toluene <br />ND <br />2 0 <br />trans -1 3-1)ichloropropane <br />ND <br />5 0 <br />1 1 2 Trichloroethane <br />ND <br />2 0 <br />Tetrachloroethene <br />ND <br />20 " <br />1 3-Dichloropropane <br />ND <br />20 " <br />Dibromochloromethane <br />ND <br />20 <br />1 2-Dibromoethane <br />ND <br />20 <br />Chlorobenzene <br />ND <br />20 <br />Ethylbenzene <br />ND <br />20 " <br />equofa Analytical - Walnut Creek The results in this 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 16 of 22 <br />