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Sequoia <br />Analytical <br />'Gettler Ryan Inc - Dublin <br />6747 Sierra Court Suite J <br />Dublin CA 94568 <br />Project Chevron <br />Project Number Chevron # 9-5775 <br />Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Reported <br />09 -May -00 1121 <br />Reporting Spike Source %REC RPD <br />Analvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE05016 - EPA 5030B [PIT] <br />Blank (OE05016-BLKI) <br />ND <br />100 ug/l <br />Prepared & Analyzed 05 -May -00 <br />tert-Butyl alcohol <br />ND <br />100 <br />ug/1 <br />Methyl tert-butyl ether <br />ND <br />20 <br />20 <br />Dr -isopropyl ether <br />ND <br />20 <br />" <br />Ethyl tert-butyl ether <br />ND <br />20 <br />Soo <br />tert-Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromethane <br />480 <br />500 960 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />480 <br />500 960 50-150 <br />Blank (OE05016-BLK2) <br />Prepared & Analyzed 08 -May -00 <br />tert-Butyl alcohol <br />ND <br />100 ug/l <br />Methyl Cert -butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />tat -butyl ether <br />ND <br />20 <br />iyl <br />-Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluonomethane <br />500 <br />500 100 50-150 <br />Surrogate 1 2-Drchlonoethane-d4 <br />Soo <br />500 100 50-150 <br />LCS (OE05016-BSI) Prepared & Analyzed 05 -May -00 <br />Methyl tent -butyl ether 592 20 ug/I 500 118 70-130 <br />Surrogate Dibromofluoromethane 500 500 100 50-150 <br />Surrogate 1 2-Dichloroeihane-d4 4&0 500 960 50.150 <br />LCS (OE05016-BS2) <br />Prepared & Analyzed 08 -May -00 <br />klethyl tert-butyl ether <br />584 20 ug/l 500 l l7 70-130 <br />Surrogate Dibromofluoromethane <br />490 500 980 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />500 500 100 50-150 <br />Matrix Spike (OE05016-MSI) <br />Source W005093-01 Prepared & Analyzed 05 -May -00 <br />Methyl tent -butyl ether <br />522 20 ug/t 500 ND 104 60-150 <br />Surrogate Dibromofluoroinethane <br />Surrogate 12 Drchloroeihane-d4 <br />490 500 980 50-150 <br />480 500 960 50-150 <br />Sequoia Analvtical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chair of <br />. custody document Thts analytical report must be reproduced m its entirety <br />Page 9 of 11 <br />*A <br />