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Sequoia <br />WalnuttDCrreek CA 94598 <br />(925) 98&9600 <br />�i Analytical <br />FAX equ slabs 73 <br />www sequolalabs co <br />Blank (OG21004-BLKI) <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 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 />lAnalvte Result Lmut Units Level Result %REC Limits RPD Ltmtt Notes <br />Batch OG21004 - EPA 5030B [PIT] <br />Blank (OG21004-BLKI) <br />Prepared & Analyzed 20 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 <br />mglm3 Atr <br />Benzene <br />ND <br />0 010 <br />" <br />Toluene <br />ND <br />0 010 <br />" <br />Ethylbenzene <br />ND <br />0 010 <br />Xylenes (total) <br />ND <br />0 010 <br />" <br />Surrogate as a-Tnfluorotoluene <br />620 <br />600 103 70-130 <br />Blank (OG21004-BLK2) <br />Prepared & Analyzed 21 -Jul -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 <br />mg/m3 Air <br />Benzene <br />ND <br />0 010 <br />" <br />Toluene <br />ND <br />0 010 <br />" <br />Ethyibenzene <br />ND <br />0 010 <br />Xylenes (total) <br />ND <br />0 010 <br />" <br />Surrogate a a a-Tnfluorotoluene <br />542 <br />600 903 70-130 <br />LCS (OG21004-BS2) <br />Prepared & Analyzed 21 -Jul -00 <br />A-01 <br />Benzene <br />340 <br />0 010 <br />mg/m' Air <br />400 85 0 65-120 <br />Toluene <br />376 <br />0 010 <br />400 940 65-120 <br />Ethylbenzene <br />4 58 <br />0 010 <br />400 114 65-120 <br />Xylenes (total) <br />128 <br />0 010 <br />120 107 65-120 <br />Surrogate a, a, a-Tnfluorotoluene <br />506 <br />600 843 70-130 <br />Analytical - Walnut Creek <br />The results in thus report apply to the samples analyzed in accordance with the chain <br />custody document Tks analytical report must be reproduced in its entire <br />M.W. <br />Page 8 of 11 <br />