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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 sequolalabs com <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 -C12) 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 5030E [P/Tl <br />LCS Dup (OD14004-BSDI) Prepared & Analvzed 14 -Apr -00 <br />Benzene <br />1 52 <br />0 010 mgim' Air <br />200 <br />760 <br />70 130 <br />387 <br />20 <br />Toluene <br />1 67 <br />0 010 <br />200 <br />935 <br />70 130 <br />3 53 <br />20 <br />Ethv]benzene <br />1 69 <br />0 010 <br />200 <br />845 <br />70-130 <br />850 <br />20 <br />V lanes (total) <br />530 <br />0 010 <br />600 <br />883 <br />70 130 <br />5 15 <br />20 <br />Surrogate as a-Trihuoro[oluene 502 600 83 7 70-130 <br />L <br />Sequoia Anal}tical - Walnut Creek <br />• <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custodv document This analytical report must be reproduced in its entirety <br />0 <br />Page 6 of 8 <br />w <br />