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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 sequolalabs com <br />Mettler 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 -00 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 R.PD Limit Notes <br />Batch OD14004 - EPA 5030B [P/TJ <br />Blank (OD14004-BLKI) Prepared & Analyzed 14 -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 />lylenes (total) ND 0 010 " <br />Surrogate aaa-Trifluorotoluene <br />S68 <br />600 947 70.130 <br />Blank (OD14004-BLK2) <br />Prepared & Analyzed 20 -Apr -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 <br />mg/m} Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 <br />" <br />Ethylbenzene <br />ND <br />0 010 <br />'dillivlenes (total) <br />ND <br />0 010 <br />" <br />IlUrrimogale aaa•Tnfluorotoluene <br />562 <br />600 <br />93 7 70-130 <br />LCS (OD14004-BSI) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Benzene <br />158 <br />0 010 <br />mg/m' Air <br />200 <br />79 0 70 130 <br />Toluene <br />1 73 <br />0 010 <br />200 <br />86 5 70-130 <br />Ethylbenzene <br />184 <br />0 010 <br />2 00 <br />920 70-130 <br />Xylenes (total) <br />558 <br />0 010 <br />600 <br />930 70-130 <br />Surrogate aaa-Tnfluorotoluene <br />514 <br />600 <br />85 7 70.130 <br />LCS (OD14ON-BS2) <br />Prepared & Analyzed <br />20 -Apr -00 <br />Benzene <br />372 <br />0 010 <br />mgtm° Air <br />400 <br />930 70 130 <br />Toluene <br />3 86 <br />0 010 <br />400 <br />965 70-130 <br />Ethylbeazene <br />3 76 <br />0 010 <br />400 <br />940 70-130 <br />Xylenes (total) <br />126 <br />0 010 <br />120 <br />105 70-130 <br />Surrogate aaa-Tnfluorotoluene <br />538 <br />600 <br />897 70-130 <br />Sequoia Analytical - Walnut Creek The results in tits report apply to the samples analyzed in accordance with the churn of <br />0 custody document This analytical repon must be reproduced in its entirety <br />Page 5 of 8 <br />•'* <br />