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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sterra Court Suite J Project Number Chevron SS#9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A <br />Sequoia Analytical - Walnut Creek <br />Reporting <br />404 N W18et Lane <br />Walnut Creek CA 94598 <br />(9z5) 988-9600 <br />FAX (925) 988-9673 <br />www "uoiatabs corn <br />Reported <br />21 -Apr -00 10 43 <br />Result Limit Units Dilution Batch Prepared Analvzed Method N <br />INF (W004445-01) Air Sampled <br />18 -Apr -00 07 44 <br />Received 19 -Apr -00 16 05 <br />tert-Butyl alcohol <br />ND <br />1000 mgim' Air 50 OD20010 20 -Apr 00 20 Apr 00 EPA 8260A <br />Methyl tert-butyl ether <br />2900 <br />25 " <br />Di -isopropyl ether <br />ND <br />25 <br />Ethyl tert-butyl ether <br />230 <br />25 <br />tert-Amyl methyl ether <br />54 <br />25 " - <br />Surrogate Dibromofluoromethane <br />104% 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />112% 50-150 " <br />EFF (W004445-02) Air Sampled <br />18 -Apr -00 07 42 <br />Received 19 -Apr -00 16 05 <br />tert-Butyl alcohol <br />ND <br />20 mg/ml Air 1 OD20010 20 -Apr 00 20 -Apr 00 EPA 8260A <br />Methyl tert-butyl ether <br />20 <br />050 " <br />Di -isopropyl ether <br />ND <br />050 " <br />Ethyl tert-butyl ether <br />ND <br />050 <br />tert-Amyl methyl ether <br />ND <br />050 <br />Surrogate Drbromofluoromethane <br />112% 50-150 <br />Surrogate 1 2-Dichloroethane-d4 116% 50-150 11 1 " 11 9 <br />Sequoia Analytical - Walnut Creek The rerultr 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 entirety <br />0 <br />Page 4 of 8 <br />