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QSequoia <br />� Analytical <br />Gettler Rvan 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 rom <br />Reported <br />18 -Apr -00 11 39 <br />Reporting Spike Source %REC RPD <br />Andivte Result Limit Units Level Result %REC Limits RPD Limit Nates <br />Batch OD13012 - EPA 5030E JP/T] <br />550 <br />300 <br />Blank (OD13012-BLK2) <br />50-150 <br />Prepared & Analyzed 13 -Apr -00 <br />Total Xylenes -- <br />ND <br />20 ug/l <br />1 1 1 2 -Tetrachloroethane <br />ND <br />20 <br />Styrene <br />ND <br />20 <br />Bromoform <br />ND <br />20 <br />Isopropylbenzene <br />ND <br />20 " <br />1 1 2 2 -Tetrachloroethane <br />ND <br />110 <br />Bromobenzene <br />ND <br />20 <br />n-Propvlbenzene <br />ND <br />20 <br />1 2 3 Tnchloropropane <br />ND <br />20 <br />2-Chlorotoluene <br />ND <br />20 <br />13,5 Tranethylbemcne <br />ND <br />20 <br />4-Chlorotoluene <br />ND <br />20 <br />tent-Butylbenzene <br />ND <br />20 " <br />1,2 4-Trtrnethylbenzene <br />ND <br />20 - <br />sec-Butylbenzene <br />ND <br />20 " <br />p-Isopropyltoluene <br />ND <br />20 " <br />1,3 -Dichlorobenzene <br />ND <br />20 " <br />1,4 -Dichlorobenzene <br />ND <br />20 " <br />n-Butylbenzene <br />ND <br />20 " <br />1 2 -Dichlorobenzene <br />ND <br />20 " <br />12-Dtbromo-3-ehloropropane <br />ND <br />50 " <br />12 4-Tnchlorobenzene <br />ND <br />20 <br />Naphthalene <br />ND <br />10 " <br />Hexachlorobutadiene <br />ND <br />10 " <br />1 2,3 Tnchlorobenzene <br />ND <br />20 " <br />Surrogate Dibromofluoromethane <br />550 <br />300 <br />110 <br />50-150 <br />Surrogate 12-Dichlor»ethprte-d4 <br />550 <br />500 <br />110 <br />50-150 <br />Surrogate Toluene d8 <br />500 <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromofluorobercente <br />500 <br />Soo <br />100 <br />50-150 <br />Sequoia Analytical - Walnut Creek <br />• <br />There sults in thus report apply to the samples analyzed in accordance with the churn of <br />custody document This analytical report must be reproduced to its ertiretye <br />ice. <br />Page 17 of 22 <br />