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Sequoia <br />Analytical <br />404 N Wiget lane <br />Walnut Geek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs corn <br />Gettler Rvan, Inc - Dubhn 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 in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Lunit Units Level Result %REC Li nits RPD Limit Notes <br />Batch 0005016 - EPA 5030B [PIT] <br />Blank (OG05016-BLKI) <br />Prepared & Analyzed 03 -Jul -00 <br />Purgeable Hvdrocarbons <br />ND <br />2 0 <br />mg/m' Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 <br />" <br />Ethvlbenzene <br />ND <br />0 010 <br />" <br />Xylenes (total) <br />ND <br />0 010 <br />" <br />Surrogate a a a-Trifluorotoluene <br />566 <br />600 943 70.130 <br />Blank (OG05016-BLK2) <br />Prepared & Analyzed 07 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />20 <br />mg/m' Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 <br />thylhenzene <br />ND <br />0 010 <br />ylenes (total) <br />ND <br />0 010 <br />Surrogate a a a- Tnfluorotoluene <br />5 68 <br />600 94 7 70-130 <br />LCS (0005016 -BSI) <br />Prepared & Analyzed 03 -Jul -00 <br />Benzene <br />170 <br />0 010 <br />mg/m' Air <br />200 850 65-120 <br />Toluene <br />180 <br />0 010 <br />200 900 65-120 <br />Ethvlbenzene <br />2 10 <br />0 010 <br />200 105 65-120 <br />Xylenes (total) <br />582 <br />0 010 <br />600 970 65-120 <br />Surrogate a a a-Tnfluorotoluene <br />526 <br />600 877 70-130 <br />LCS (OG05016-BS2) <br />Prepared & Analyzed 07 -Jul -00 <br />Benzene <br />330 <br />0 010 <br />mglm' Air <br />400 825 65-120 <br />Toluene <br />3 56 <br />0 010 <br />400 990 65-120 <br />Ethylbenzene <br />428 <br />0 010 <br />400 107 65-120 <br />Xylenes (total) <br />119 <br />0 010 <br />12 0 992 65-120 <br />Surrogate aaa-Trtfluorotoluene <br />524 <br />600 873 70.130 <br />equota Analytical - Walnut Creek The results to this report apply to the samples analyzed to accordance with the chain of <br />custody document Tits analytical report must be reproduced in its entirety <br />Page 14 of 25 <br />: <br />