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Sequoia <br />Analytical <br />404 N Wlget Lane <br />Walnut Geek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs.com <br />Wer Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron #J9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 26 -Jul -00 10 48 <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 />vte Result Limit Units Level Result %REC Ltmlts RPD Lmut Notes <br />Batch OG21004 - EPA 50308 [PIT] <br />Blank (OG21004-BLK1) <br />Prepared & Analyzed 20 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 mg1W Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 " <br />£thylbenzene <br />ND <br />0 010 " <br />Xylenes (total) <br />ND <br />0 010 <br />Surrogate a a a-Tnfiuoromluene <br />610 <br />600 103 70-130 <br />Blank (OG21004-BLK2) <br />Prepared & Analyzed 21 -Jul -00 <br />Purgeable hydrocarbons <br />ND <br />2 0 mglm' Ar <br />Benzene <br />ND <br />0 010 " <br />Toluene <br />ND <br />0 010 " <br />Ethylbenzene <br />ND <br />0 010 " <br />YAmbes ( ) <br />ND <br />0 010 " <br />gate gQa•Tri luormoluene <br />542 <br />6.00 903 70-130 <br />LCS (OG21004-BS2) <br />Prepared & Analyzed 21 -Jul -0O A-01 <br />Boazene <br />340 <br />0 010 mglm' Au <br />400 850 65-120 <br />Toluene <br />376 <br />0 010 <br />400 940 65420 <br />Ethylbenzem <br />4 58 <br />0 010 <br />400 114 b5-120 <br />Xylenes (total) <br />12.8 <br />0 010 <br />12.0 107 65-120 <br />Surrogate as a-Trifluorotoluene <br />506 <br />" <br />600 843 70.130 <br />Sequoia Analytical - Walnut Creek The results in tins report apply to the samples analysed m accordance with the chain of <br />0 custody documem. Tins analytical report must be reproduced to its entirety <br />Page 8 of 11 <br />NO <br />