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Sequoia <br />404 N Wlget lane <br />Walnut Creek, <br />4 <br />98 -9600 <br />(925) 988-9fiD0 <br />Analytical <br />fAX (925) 988-9673 <br />www sequolalabs <br />19 7 0 50 ug/l <br />Gettler Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 25 -Jul -00 10 44 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knatvte Result Luna Units Level Result %REC Limits RPD Limit Notes <br />Batch 0007003 - EPA 50308 [PIT) <br />Source W006676-10 <br />Prepared & Analyzed 07 -Jul -00 <br />Blank (OG07003-BLKI) <br />Benzene <br />19 7 0 50 ug/l <br />Prepared & Analyzed 07 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />50 ug/l <br />t9 9 0 50 <br />Benzene <br />ND <br />050 <br />Ethylbenzene <br />Toluene <br />ND <br />050 " <br />20 <br />Ethylbenzene <br />ND <br />050 " <br />6 85 <br />Xylenes (total) <br />ND <br />050 " <br />Surrogate a a,a-Tnfluorotoluene <br />308 <br />300 103 70-130 <br />LCS (OG07003-BSI) <br />Prepared & Analyzed 07 -Jul -00 <br />Benzene <br />19 6 <br />0 50 ug/l <br />200 980 70-130 <br />Toluene <br />202 <br />050 <br />200 101 70-130 <br />Ethylbenzene <br />213 <br />0 50 <br />200 106 70-130 <br />Xylenes (total) <br />61 1 <br />0 50 <br />600 102 70-130 <br />Surrogate a a a-Tnfluorotoluene <br />291 <br />300 970 70-130 <br />Matrix Spike (OG07003-MSI) <br />Source W006676-10 <br />Prepared & Analyzed 07 -Jul -00 <br />Benzene <br />210 <br />050 ugll <br />200 ND 105 70-130 <br />Toluene <br />212 <br />050 <br />200 ND 106 70-130 <br />Ethylbenzene <br />213 <br />0 50 <br />200 ND 106 70-130 <br />Xylenes (total) <br />619 <br />0 50 <br />600 ND 103 70-130 <br />Surrogate a as-Trtt luorotoluene <br />271 " 300 903 70-130 <br />Matrix Spike Dup (OG07003-MSDI) <br />Source W006676-10 <br />Prepared & Analyzed 07 -Jul -00 <br />Benzene <br />19 7 0 50 ug/l <br />200 ND 985 70-130 <br />639 <br />20 <br />Toluene <br />t9 9 0 50 <br />20 0 ND 995 70-130 <br />633 <br />20 <br />Ethylbenzene <br />20 0 0 50 <br />20 0 ND 100 70-130 <br />630 <br />20 <br />Xylenes (total) <br />578 0 50 <br />600 ND 963 70-130 <br />6 85 <br />20 <br />Surrogate aa,a-Tnfluorotoluene <br />272 <br />11 300 907 70-130 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain <br />custody document This analytical report must be reproduced in its entire <br />Page 13 of 25 <br />M. <br />