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Sequoia <br />Analytical <br />404 N Wiget Lane <br />Walnut Creels CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Gettler Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J 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-Cl2) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14004 - EPA 5030B JP/TJ <br />LCS Dup (OD14004-BSD1) <br />Prepared & Analvzed <br />14 -Apr -00 <br />Benzene <br />152 <br />0 010 <br />mg/m' Air 200 <br />760 70-130 <br />3 87 <br />20 <br />Toluene <br />167 <br />0 010 <br />200 <br />835 70-130 <br />3 53 <br />20 <br />£thvibenzene <br />169 <br />0 010 <br />200 <br />843 70-130 <br />850 <br />20 <br />%,, lenes (total) <br />530 <br />0 010 <br />600 <br />983 70-130 <br />5 15 <br />20 <br />Surrogate a a a-TnJluororoluene <br />502 <br />600 <br />837 70-130 <br />Sequoia Anal) tical - Walnut Creek The results in this report apply to the samples analwed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirely <br />Page 6 of 8 <br />.*. <br />