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404 int Wiget Lane <br />Sequoia Walnut Geek CA <br />94598 <br />(925) 988-9600-9600 <br />FAX (M) 988-9673 <br />Analytical , sequolalabscom <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 24 -Jul -00 11 33 <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 OG10007 - EPA 5030E (PIT] <br />Blank (OG10007-BLK1) <br />Prepared & Analyzed 10 -Jul -00 <br />Ethanol <br />ND <br />500 <br />ug/1 <br />tert-Butyl alcohol <br />ND <br />100 <br />" <br />Methyl tert-butyl ether <br />ND <br />20 <br />Di isopropvl ether <br />ND <br />20 <br />" <br />Ethyl tert butyl ether <br />ND <br />20 <br />" <br />tert-Amyl methvl ether <br />ND <br />20 <br />1 2-Dlchlofoethane <br />ND <br />20 <br />Ethylene dibroaude <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromethane <br />500 <br />500 100 50.150 <br />Surrogate 1 2-Dichloroethane-d4 <br />460 <br />500 920 50.150 <br />lank (OG10007-BLK2) <br />Prepared & Analyzed 11 -Jul -00 <br />Pkhanol <br />ND <br />500 <br />up[ <br />tert-Butyl alcohol <br />ND <br />100 <br />Methyl tert butyl ether <br />ND <br />20 <br />" <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tert-butyl ether <br />ND <br />20 <br />" <br />tent Acnvl methyl ether <br />ND <br />20 <br />" <br />1,2 Dtchloroethane <br />ND <br />20 <br />Ethylene dibronude <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />Soo <br />500 100 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />450 <br />500 900 50.150 <br />LCS (OG10007-BSI) <br />Prepared & Analyzed 10 -Jul -00 <br />Methyi tert-butyl ether <br />516 <br />20 <br />ugJl 500 103 70-130 <br />Surrogate Dibromofluoromethane <br />490 <br />500 980 50-150 <br />Surrogate 11-Dichloroethane-d4 <br />450 <br />500 900 50-150 <br />Analytical - Walnut Creek <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />�equota <br />custody document This analytical report must be reproduced to its entirety <br />Page 11 of 15 <br />