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Sequoia <br />� Analytical <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988 9673 <br />www sequoialabs com <br />Gettler Ryan Inc -Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 12 -Apr -00 1136 <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 />lAnalvtc Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD10015 - EPA 5030B [PIT] <br />LCS Dup (OD10015-BSDI) <br />Prepared & Analyzed 06 -Apr -00 <br />Benzene <br />159 <br />0 010 <br />mg/m' Air 200 79 5 70-130 <br />370 <br />20 <br />Toluene <br />1 64 <br />0 010 <br />200 82 0 70-130 <br />359 <br />20 <br />Ethvlbenzene <br />189 <br />0 010 <br />200 945 70-130 <br />166 <br />20 <br />Xylenes (total) <br />5 12 <br />0 010 <br />600 85 3 70-130 <br />716 <br />20 <br />Surrogate ac a a-Trifluorotoluene <br />536 <br />600 893 70-130 <br />• <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analysed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety. <br />Page 9 of 12 <br />