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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 corn <br />ttler Rvan lnc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 44568 Project Manager Scott Polston 01 -Jun -00 1105 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creel <br />Reporting Spike Source %REC RPD <br />4nalvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE31001 - EPA 5030B [P/TJ <br />Blank (OE31001-BLK1) <br />Prepared & Analyzed 31 -May -00 <br />Purgeable Hvdrocarbons <br />ND <br />50 <br />UWl <br />Benzene <br />ND <br />050 <br />Toluene <br />ND <br />0 50 <br />Ethvlbenzene <br />ND <br />0 50 <br />•vlenes (total) <br />ND <br />050 <br />Surrogate a a a Trifluorotoluene <br />30J <br />300 101 -0-130 <br />LCS (OE31001-BSI) <br />Prepared & Analvzed 31 -May -00 <br />Benzene <br />180 <br />0 50 <br />u_w1 <br />200 900 70-130 <br />Toluene <br />19 5 <br />0 50 <br />200 975 70-130 <br />Ethylbenzene <br />218 <br />050 <br />200 109 70-130 <br />Xylenes (total) <br />645 <br />050 <br />600 108 70-130 <br />ate as a-Trrfluorotoluene <br />263 <br />300 877 70.130 <br />LCS Dup (OE31001-BSDI) <br />Prepared & Analyzed 31 -May -00 <br />Benzene <br />17 2 <br />0 50 <br />ugtl <br />200 86 0 70430 <br />455 <br />20 <br />Toluene <br />189 <br />0 50 <br />200 945 70430 <br />3 13 <br />20 <br />lthylbenzene <br />199 <br />050 <br />200 99 5 70-130 <br />9 1 1 <br />20 <br />}Cylea,es (total) <br />613 <br />050 <br />600 102 70-130 <br />5 09 <br />20 <br />Surrogate aqa-Tnj`luorwohrene 265 300 883 70-130 <br />uoia Anamical - waulut k-reeK <br />The revulir in this report apply to the samples analysed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />�� <br />Page 4of7 <br />