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Sequoia <br />Analytical <br />Gettler Ryan, Inc - Dublin <br />6747 Sierra Court Suite J <br />Dublin CA, 94568 <br />Project Cbevron <br />Project Number Chevron # 9-5775 <br />Project Manager Scott Polston <br />404 N Wlget Lane <br />Walnut Creek CA 945% <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Reported <br />09 -May -00 11 21 <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 />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE08013 - EPA 5030B [PIT] <br />Blank (OE08013-BLKI) <br />Prepared 05-Mdy-00 Analyzed 06 -May -00 <br />Purgeable Hydrocarbons <br />ND <br />10 mglm' Air <br />Benzene <br />ND <br />010 <br />Toluene <br />ND <br />010 " <br />Ethylbenzene <br />ND <br />010 " <br />}Xylenes (total) <br />ND <br />010 <br />Methyl tert-butyl ether <br />ND <br />0 50 <br />Surrogate aaa-Tnfluorotoluene <br />586 600 977 70-130 <br />LCS (OE08013-BSI) <br />Prepared 05 -May -00 Analvzed 08 -May -00 <br />Benzene <br />164 <br />0 10 <br />mg/ml Air 200 82 0 70-130 <br />Toluene <br />1 75 <br />0 t0 <br />200 875 70-130 <br />Ethylbenzene <br />191 <br />0 10 <br />200 95 5 70-130 <br />Xylenes (total) <br />560 <br />0 10 <br />600 933 70-130 <br />Surrogate a, a, a-Tnfluorotoluene <br />538 <br />600 897 70-130 <br />_ <br />LCS Dup (OE08013-BSD1) <br />Prepared 05 -May -00 Analyzed 06 -May -00 <br />Q-07 <br />Benzene <br />143 <br />0 10 <br />mg/ml Air 200 71 5 70-130 13 7 <br />20 <br />Toluene <br />l 54 <br />0 10 <br />200 770 70-130 12 8 <br />20 <br />Ethylbenzene <br />1 56 <br />0 10 <br />200 780 70-130 202 <br />20 <br />Xylenes (total) <br />490 <br />0 10 <br />600 817 70-130 13 3 <br />20 <br />Surrogate aa,a-Tnfluorotoluene 534 600 890 70.130 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chma of <br />custody document This analytical report must be reproduced in its entirety. <br />Page 8 of 11 <br />