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Sequoia <br />Analytical <br />404 N Wiget Lane <br />Walnut creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www segucialabs corn <br />ler Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite ! Project Number Chevron SS#9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 21 -Apr -0O 10 43 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Repotting Spike Source %REC RPD <br />lnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14004 - EPA 5030B JP/Tl <br />Blank (OD14004-BLK1) Prepared & Analyzed 14 -Apr -00 <br />Purgeable Hvdrot arbons <br />ND <br />2 0 mgim' Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 <br />Ethylbenzene <br />ND <br />0 010 ' <br />Xylenes (total) <br />ND <br />0 010 <br />Surrogate aaa-Trifluorotoluene 568 600 94 7 70-130 <br />Blank (OD 14004-BLK2) Prepared & Analvzed 20 -Apr -00 <br />Purgeable Hydrocarbons ND 2 0 mgim' Air <br />Benzene ND 0 010 <br />Toluene ND 0 010 " <br />Ethylbenzene ND 0 010 " <br />W (total) ND 0 010 <br />311pFgale aaa.Trifluorotoluene 562 600 93 7 70-130 <br />LCS (OD14004-BSI) Prepared & Analyzed 14 -Apr -00 <br />Benzene <br />158 <br />0 010 <br />mglm' Air 200 <br />790 <br />70-130 <br />Toluene <br />173 <br />0 010 <br />200 <br />865 <br />70-130 <br />Ethylbenzene <br />184 <br />0 010 <br />200 <br />920 <br />70-130 <br />Xylenes (total) <br />558 <br />0 010 <br />600 <br />930 <br />70-130 <br />Surrogate aaa-Tnfluorotoluene <br />514 <br />600 <br />85 7 <br />70.130 <br />LCS (OD14004-BS2) <br />Prepared & Analyzed 20 -Apr -00 <br />Benzene <br />372 <br />0 010 <br />mgim' Au 400 <br />930 <br />70-130 <br />Toluene <br />386 <br />0 010 <br />400 <br />965 <br />70.130 <br />Ethylbenzene <br />376 <br />0 010 <br />400 <br />940 <br />70-130 <br />Xylenes (total) <br />126 <br />0 010 <br />120 <br />105 <br />70-130 <br />Surrogate aaa-Tnfluorwoluene <br />538 <br />600 <br />897 <br />70.130 <br />Sequoia Analytical - Walnut Creek The result in this report apply to the samples analyzed in accordance with the chain of <br />0 custody document This analytical report must be reproduced in its entirety <br />Page 5 of 8 <br />- <br />