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4 4 I) <br />Sequoia <br />qw Analytical <br />404 N Wiget lane <br />Walnut Creek CA 94598 <br />(925) 98&9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />rtler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron tI 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 19 -Apr -00 1141 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spire Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br />Batch OD 14016 - EPA 50311E [PIT] <br />LCS (0D140t6-BSI) <br />Prepared & Analyzed <br />14 -Apr -00 <br />%lethvl tent hutvl ether <br />564 <br />0 50 mg/rn' Air 500 <br />113 70-130 <br />Surrogate Drbromofluoromethane <br />530 <br />500 <br />106 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />470 <br />500 <br />940 50-150 <br />LCS Dup (OD14016-BSD1) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Mettivl tert-butyl ether <br />444 <br />0 50 mgim° Air 500 <br />888 70-130 23 8 25 <br />Surrogate Dibromofluoromethane <br />500 <br />500 <br />100 50-150 <br />Surrogate 1 2-Dichloroethmte-d4 <br />460 <br />500 <br />920 50 150 <br />• <br />Sequoia Analytical - Walnut Creek <br />i <br />The results in this report apply to the samples anahzed to accordance with the chain of <br />custody document This analytical report must be reproduced to its entirety <br />Page 6 of 7 <br />