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Sequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Geek CA 94598 <br />(925)988-9600 <br />FAX (92S) 988-9673 <br />www sequolalabs corn <br />Get�tler Ryan, hie -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Deanna L Harding 29 -Jul -00 17 31 <br />Total Purgeable Hydrocarbons (C6 -C12), BTEX and MTBE by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OG27003 - EPA 5030B [P/TJ <br />Blank (OG27003-BLKI) <br />290 <br />Prepared & Analyzed 27 -Jul -00 <br />Pwgeable Hydrocarbons <br />ND <br />50 ugll <br />Benzene <br />ND <br />050 " <br />Toluene <br />ND <br />050 " <br />Ethylbenzene <br />ND <br />050 " <br />Xylenes (tonal) <br />ND <br />050 " <br />Diethyl tent -butyl ether <br />ND <br />25 " <br />Surrogate iza a -Th luorotoluene <br />290 <br />oo300 <br />967 70-130 <br />LCS (OG27003-BSI) <br />Prepared & Analyzed 27 -Jul -00 <br />Benzene <br />208 <br />050 ug/l <br />200 104 70-130 <br />Toluene <br />209 <br />050 <br />200 104 70-130 <br />Ethylbenzene <br />21 1 <br />050 <br />200 106 70-130 <br />605 <br />050 <br />600 101 70-130 <br />Serrrogerte tr qa Tnfluorotoluene <br />18.2 <br />300 940 70-130 <br />Matrix Spike (OG27003-MSI) <br />Source W007337-12 <br />Prepared & Analyzed 27 -Jul -00 <br />Benzene <br />234 <br />050 ugn <br />200 ND 117 70-130 <br />TOhm" <br />233 <br />050 <br />200 ND 116 70-130 <br />mylbeftzene <br />23 1 <br />050 <br />200 ND 116 70-130 <br />Xyleaes (total) <br />662 <br />050 <br />600 ND 110 70-130 <br />Surrogade gqa-TrlJhrorotohwm <br />3a0 <br />300 100 70-130 <br />Matrix Spike Dup (OG27003-MSDI) <br />Source W007337-12 <br />Prepared & Analyzed. 27-Ju1-00 <br />Benzene <br />206 <br />050 ug/l <br />200 ND 103 70.130 <br />127 20 <br />Tohuac <br />207 <br />050 <br />200 ND 104 70-130 <br />118 20 <br />Ethylbenzene <br />212 <br />050 " <br />200 ND 106 70-130 <br />858 20 <br />Xylenes (total) <br />607 <br />050 " <br />600 ND 101 70-130 <br />867 20 <br />SswMate gga-TrlPuboratoluene <br />278 <br />300 927 70-130 <br />Analytical - Wahiut <br />The results in this report apply to the samples analyzed in aceoraaace wrist ere cmmn of <br />custody documem. This analytical report rarest be reproduced in its entirety <br />Page 22 of 26 <br />