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1 <br />Sequoia <br />� Analytical <br />404 N Wlget lane <br />Walnut Crede, CA 94598 <br />(925) 988-9600 <br />FAX (925) 988.9673 <br />www sequoiatabn <br />Gettler Ryan Inc -Dublin Projmt Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 24 -Jul -00 11 33 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />vte Result Lunt Units Level Result %REC Linuts RPD Lumt Notes <br />Batch OG11015 - EPA 50308 [PIT] <br />LCS Dup (OGI1015-BSDI) Prepared & Analyzed 11 -Jul -00 <br />Methyl ten-butvl ether 430 0 So mg/m' Air 300 860 70-130 320 25 <br />Surrogate DibromoJluoromethane 490 SO 0 980 50-150 <br />Surrogate l 2-Dichloroethane-d4 460 500 920 50.150 <br />• <br />Sequoia Analytical - Walnut Creek The results in tins report apply to the samples analyzed in accordance with the c <br />custody document Ths analytical report must be reproduced in its en <br />Page 13 of I5 <br />