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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron SS119-5775 <br />Dublin CA, 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Reported <br />21 -Apr -00 10 43 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD20010 - EPA 5030B [PIT] <br />Blank (OD20010-BLKI) Prepared & Analyzed 20 -Apr -00 <br />tert-Butyl alcohol ND 20 mg/m' Air <br />Methyl tert-butyl ether ND 050 <br />Di isopropyl ether ND 050 <br />Ethyl tent-buty] ether ND 050 <br />tent -Amyl methyl ether ND 050 <br />Surrogate Dibromofluoromethane <br />510 <br />500 102 50-150 <br />Surrogate 12-Dichloroethane d4 <br />530 <br />Soo 106 50.150 <br />LCS (OD20010-BSI) <br />Prepared & Analyzed 20 -Apr -00 <br />Methyl tert-butyl ether <br />493 <br />0 50 mgrrn' Air Soo 996 70-130 <br />Surrogate Dibromofluoromethane <br />500 <br />500 100 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />530 <br />500 106 50-150 <br />CS Dup (OD20010-BSDI) <br />Prepared & Analyzed 20 -Apr -00 <br />ethyl tert-butyl ether <br />585 <br />0 50 mg/rn' Air 500 117 70-130 171 25 <br />Surrogate Dibromofluoromeihane 500 500 100 50-150 <br />Surrogate 12-Dichlonwhone-d4 530 500 106 50-150 <br />Sequoia Analytical -Walnut Creek The rerulls in this report apply to the samples analyzed to accordance with the chars of <br />0 custody document This analytical report must be reproduced in its entirely <br />Page 7 of 8 <br />.* <br />