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4 t Sequoia <br />vo- Analytical <br />Gettler Rvan- Inc - Dublin <br />6747 Sierra Court Suite J <br />Dublin CA, 94568 <br />Project Chevron <br />Project Number Chevron 49-5775 <br />Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC <br />Anaiyte Result Lutut Units Level Result %REC Lumts RPD <br />Batch OG19014 - EPA 5030B [PITj <br />Blank (OG19014-BLKI) Prepared & Analyzed 19 -Jul -00 <br />teat -Butyl alcohol ND 20 mg/m' Air <br />Methyl tort -butyl ether ND 050 " <br />Dr -isopropyl ether ND 050 " <br />Ethyl teat -butyl ether ND 050 " <br />tent-Amvl methyl ether ND 050 " <br />Surrogate Drbromofluoromethane <br />Surrogate 12 Dtchloroerhane-d4 <br />LCS (OG19014-BSI) <br />Methyl tert-butyl ether <br />Surrogate DtbromoJluoromethane <br />Surrogate 1 1 Drchlonoerhane-d4 <br />LCS Dup (OG19014-BSD1) <br />Mdhyl tent -butyl ether <br />404 N Wtget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequolalahs corn <br />Reported <br />26 -Jul -00 10 48 <br />RPD <br />Ltnut Notes <br />SS 0 500 110 50.150 <br />530 Soo 106 50.150 <br />Prepared & Analyzed 19 -Jul -00 <br />565 0 50 mg/rn' Atr 500 113 70-130 <br />540 560 108 50-150 <br />530 " Soo 106 50-150 <br />Prepared & Analyzed 19 -Jul -00 <br />549 0 50 mg(W Air 500 110 70-130 287 25 <br />Surrogate Dtbromofluoromedhane 540 500 108 50-150 <br />&uMare 11-Drehloroedwne-d4 510 500 104 50-150 <br />Batch OG20015 - EPA 5030B [Pffl <br />Blink (OG20015-BLKi) <br />Prepared & Analyzed 19 -Jul -00 <br />tert-&018100}ml <br />ND <br />100 ug/l <br />Methvl tett-butyl dher <br />ND <br />20 " <br />Dt-soprapyl ether <br />ND <br />20 " <br />Ethyl tert4mayl other <br />ND <br />20 " <br />tent Amyl methyl ether <br />ND <br />20 " <br />Savrvgate Dibromofivarometlrane <br />SS O <br />500 110 50.150 <br />SwToXWe 1,2-Dichloroedww-d4 <br />530 <br />Soo 106 50-150 <br />Sequoia Analytical - Walnut Creek The results in tins report apply to the samples analyzed in accordance wtrh the chain of <br />custody document This analytical report mut be reproduced to its entire* <br />Page 9 of 11 <br />