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QSequoia <br />� Analytical <br />404 N WigetLane <br />Waknut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />WWW sequoialabs com <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 09 -May -00 1121 <br />_7 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />4nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE05016 - EPA 5030E [P/TI <br />Matra Spike Dup (OE05016-MSD1) Source W005093-01 Prepared 05 -May -00 Analyzed 08 -May -00 <br />klethyi tent buivl ether 570 20 ugli 500 ND 114 60 150 879 25 <br />Surrogate Drbromofluoromethane Soo 500 100 50.150 <br />Surrogate 1 2-Dichloroethane-d4 500 500 100 50.150 <br />Batch OE08023 - EPA 5030B [PIT] <br />Blank (OE08023-BLKI) <br />Prepared & Analyzed 08 -May -00 <br />tart -Butyl alcohol <br />ND <br />20 mglm' Air <br />Methyl tort -butyl ether <br />ND <br />050 " <br />Di isopropyl ether <br />ND <br />050 " <br />Ethyl tent -butyl ether <br />ND <br />050 " <br />tent -Amyl methyl ether <br />ND <br />050 <br />Surrogate DibromoJluoromethane <br />480 <br />Soo 960 50-150 <br />Surrogate 12-Dtchloroethane-d4 <br />Soo <br />500 100 50-150 • <br />LCS (OE08023-BSI) <br />Prepared & Analyzed 08 -May -00 <br />Methyl tat -butyl ether <br />584 <br />0 50 mg/in' Air <br />500 117 70-130 <br />Srrrogate Dibrvmofluommedume <br />490 <br />500 980 50.150 <br />Surrogate 1,2-Dichloroethane-d4 <br />500 <br />500 100 50-150 <br />L.CS Dup (OE08023-BSDI) <br />Prepared & Analyzed 08 -May -00 <br />Methyl tent -butyl ether <br />600 <br />0 50 mg(m' Au <br />Soo 120 70-130 270 25 <br />S--gau Dibrvn>qlecom -eth— <br />490 <br />SO 0 980 50 -ISO <br />Srmvgate l 2-Dichlataedww-d4 <br />470 <br />Soo 940 50.150 <br />Sequoia Analvttcal - Walnut Creek <br />The results in [lus report apply to the samples analysed in accordance with the chain of <br />custody document Thrs analytical report must be reproduced in its entirely <br />• <br />Page 10 of it <br />:*. <br />