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Sequoia <br />� Analytical <br />404 N Wlget Lane <br />Walnut Creels CA 94598 <br />(925) 988-9600 <br />FAX (925) 988 9673 <br />www sequotalabs corn <br />Crettler Ryan hic -Dublin Protect Chevron <br />6747 Sierra Court Suite J Project ]dumber Chevron 4 9-5775 Reported <br />DublinCA 94568 Project Manager Scott Polston l8 -Apr -0O 1139 <br />Total Purgeable Hydrocarbons (C6-Cl2) and BTEX in Ayr by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knal�te Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD14004 - EPA 5030B [P/TJ <br />Blank (OD14004-BLK1) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Purgeable Hvdrocarbons <br />ND <br />2 0 <br />mglm' As <br />Benzene <br />ND <br />0 010 <br />" <br />Toluene <br />ND <br />0 010 <br />Ethylbenzene <br />ND <br />0 010 <br />\vlenes (total) <br />ND <br />0 010 <br />Surrogate aaa-Trrfluorotoluene <br />5 68 <br />600 <br />94 7 '0-130 <br />LCS (OD14004-BSI) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Benzene <br />1 58 <br />0 010 <br />mglm3 Air 200 <br />790 70-130 <br />Toluene <br />1 73 <br />0 010 <br />200 <br />865 70-130 <br />Ethylbenzene <br />1 84 <br />0 010 <br />200 <br />920 70-130 <br />Xylenes (total) <br />5 58 <br />0 010 <br />600 <br />93 0 70 130 <br />Surrogate aa,a-Trtfluorotoluene <br />514 <br />600 <br />857 70-130 <br />LCS Dup (ODI4004-BSD1) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Benzene <br />152 <br />0 010 <br />mg/m3 Air 200 <br />760 70.130 <br />387 <br />20 <br />Toluene <br />167 <br />0 010 <br />200 <br />835 70-130 <br />353 <br />20 <br />Ethylbenzene <br />169 <br />0 010 <br />200 <br />845 70-130 <br />850 <br />20 <br />Xylenes (total) <br />530 <br />0 010 <br />600 <br />893 70.130 <br />5 15 <br />20 <br />Surrogate aaa-Trrfluonotoluene 502 600 837 70.130 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entire <br />Page 15 of 22 <br />