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Sequoia <br />� Analytical <br />GLttler Rvan Inc. - Dublin <br />0747 Sierra Court Suite! <br />Dublin CA 94568 <br />Project Chevron <br />Project Number Chevron # 9-5775 <br />Project Manager Scott Polstort <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creel <br />444 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />WWW sequotalabs corn. <br />Reported <br />18 -Apr -00 11 39 <br />Reporting Spike Source %REC RPD <br />Analtite Result Limit Units Level Result %REC Lirmb RPD Limit Notes <br />Batch OD13012 - PPA 5030B [PIT] <br />550 <br />Soo <br />Blank (OD13012-BLK2) <br />50.150 <br />Prepared & Analtized 13 -Apr -00 <br />Total lylenes <br />ND <br />20 ugll <br />1 1 1 2 -Tetrachloroethane <br />ND <br />20 <br />Stvrene <br />ND <br />20 <br />Bromoform <br />ND <br />20 <br />Isopropylbenzene <br />ND <br />20 <br />1 12 2 -Tetrachloroethane <br />ND <br />20 <br />Bromobenzene <br />ND <br />20 <br />n-Propvibenzene <br />ND <br />20 <br />1 2 3 Tnchloropropane <br />ND <br />20 <br />2-Chlorotoluene <br />ND <br />20 <br />1 3,3-Tnmethylbenzene <br />ND <br />20 <br />4-Chlorotoluene <br />ND <br />20 " <br />tent-Butylbenzene <br />ND <br />20 <br />12 4-Tnmethylbenzene <br />ND <br />20 " <br />seoButylbenzene <br />ND <br />2 0 " <br />p-lsopropyttoluene <br />ND <br />20 " <br />1,3 -Dichlorobenzene <br />ND <br />20 " <br />1 4-Drchlorobertzme <br />ND <br />20 " <br />n-Butyibenzene <br />ND <br />20 " <br />1 2 -Dichlorobenzene <br />ND <br />20 " <br />1,2-Dibromo-3-chloropropane <br />ND <br />50 ' <br />1,2,4-Tnchlorober me <br />ND <br />20 " <br />Naphthalene <br />ND <br />10 " <br />Hexachlorobutadtene <br />ND <br />10 " <br />12 3-Tnchlorobenzene <br />ND <br />20 " <br />Surrogate Dibromofluoromethane <br />550 <br />Soo <br />110 <br />50.150 <br />Surrogate 1 2-Dtehloroelhmte-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-BromoJluoroberrene <br />500 <br />Soo <br />100 <br />50.150 <br />Sequoia Analytical - Walnut Creek The re sults to thit report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in rtr enirrelo <br />Page 17 of 22 <br />