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QSequoia <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 />Gettler R�nn L]li - Dublin Project Chevronis <br />047 Sterna Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 02 -Jun -00 09 23 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spine Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE31001 - EPA 54130E JP/TJ <br />172 <br />050 ug/1 <br />200 <br />Blank (OE31001-BLK1) <br />70-130 <br />455 <br />Prepared & Anal vzed 31-Mav-00 <br />Purgeable Hvdro,-trbom <br />SID <br />50 <br />ue`/l <br />Benzene <br />ND <br />050 <br />20 <br />Toluene <br />ND <br />050 <br />200 <br />Ethvlbenzene <br />ND <br />0 50 <br />" <br />%vlenes (total) <br />ND <br />0 50 <br />" <br />Surrogate aaa-Trtfluorwoluene <br />303 <br />509 <br />300 101 70-130 <br />LCS (OE31001-BSI) <br />26.5 <br />Prepared & Analyzed 31-Mav-00 <br />Benzene <br />180 <br />050 <br />ug/l 200 900 70 130 <br />Toluene <br />195 <br />0 50 <br />20 0 975 70-130 <br />Ethylbenzene <br />21 8 <br />050 <br />200 109 70-130 <br />Xylenes (total) <br />645 <br />0 50 <br />600 108 70 130 <br />Surrogate aaa-Trtfduorotoluene <br />263 <br />300 877 70.130 <br />LCS Dup (OE31001-BSD1) <br />Prepared 31 -May -0O Analyzed 01 -Jun -00 <br />Beene <br />172 <br />050 ug/1 <br />200 <br />860 <br />70-130 <br />455 <br />zu <br />Toluene <br />189 <br />050 <br />200 <br />945 <br />70-130 <br />3 13 <br />20 <br />Ethylbenzene <br />199 <br />050 " <br />200 <br />995 <br />70430 <br />911 <br />20 <br />Xylenes (total) <br />613 <br />050 <br />600 <br />102 <br />70.130 <br />509 <br />20 <br />Surrogate aaa-Tr{Jtuonotoluene <br />26.5 <br />300 <br />883 <br />70-130 <br />Sequoia Analvtical - Walnut Creek The resells in thi s report apply to the samples analyzed in accordance with the chars of <br />custody document This analytical report must be reproduced in its entirety <br />0 <br />Page 3 of 4 <br />