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Sequoia <br />Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs tom <br />Gettler Ryan 1n1. -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublm CA 94568 Project Manager Scott Polston 18 -Apr -00 11 39 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14004 - EPA 5030E JPfrJ <br />600 <br />Prepared & Analyzed <br />857 70.130 <br />14 -Apr -00 <br />Blank (OD14004-BLKI) <br />152 <br />0 010 <br />Prepared & Analyzed <br />14 -Apr -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 <br />mg/ml Air <br />200 <br />Benzene <br />ND <br />0 010 <br />" <br />0 010 <br />Toluene <br />ND <br />0 010 <br />20 <br />530 <br />Ethylbenzene <br />ND <br />0 010 <br />" <br />20 <br />\ylenes (total) <br />ND <br />0 010 <br />837 70-130 <br />Surrogate aaa-Trffluorotoluene <br />568 <br />600 <br />947 70-130 <br />LCS (OD14004-BSI) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Benzene <br />158 <br />0 010 <br />mg/ml Air 200 <br />790 70-130 <br />Toluene <br />173 <br />0 010 <br />200 <br />865 70-130 <br />Ethylbenzene <br />184 <br />0 010 <br />200 <br />920 70-130 <br />Xylenes (total) <br />558 <br />0 010 <br />600 <br />930 70-130 <br />Surrogate aria-Trifluorotoluene <br />LCS pup (OD14004-BSDI) <br />Benzene <br />Toluene <br />Ethylbenzene <br />Xylenes (total) <br />Surrogate aaa-Trifluorotoluene <br />Sequoia Analytical - Walnut Creek <br />514 <br />600 <br />Prepared & Analyzed <br />857 70.130 <br />14 -Apr -00 <br />152 <br />0 010 <br />mgim' Air 200 <br />760 70-130 <br />387 <br />20 <br />167 <br />0 010 <br />200 <br />835 70-130 <br />353 <br />20 <br />169 <br />0 010 <br />200 <br />845 70-130 <br />850 <br />20 <br />530 <br />0 010 <br />600 <br />883 70-130 <br />5 15 <br />20 <br />502 <br />600 <br />837 70-130 <br />The results in /hit report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entire* <br />`=RO <br />Page 15 of 22 <br />