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Sequoia WalnutGCA N wlLane eek 94598 (925)958-9600 Analytical www 988-%73 sequequoialafas con, Gettler Ryan,Inc -Dublin Project Chevron 6747 Sierra Court Suite J Project Number Chevron h 9-6258 Reported Dublin CA,94568 Project Manager Deanna L Harding 27-Jul-01 10 47 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-1 (W107225-02)Water Sampled 12-Jul-01 12 55 Received 12-Jul-01 16 30 Ethanol ND 500 ug/l I 1G20011 24-Jul-01 24-Jul-01 EPA 8260B tert-Butyl alcohol ND 20 " Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 tert-Amyl methyl ether ND 20 " Surrogate Dibromofluoromethane 982% 50-150 " Surrogate 12-Dtchloroethane-d4 936% 50-150 " M1 %-2(W107225-03)Water Sampled 12-Jul-01 13 14 Received 12-Jul-01 16 30 Ethanol ND 500 ugA I IG20011 24-Jul-01 24-Jul-01 EPA 8260B tert-Butyl alcohol ND 20 " Methyl tert-butyl ether ND 20 'JiJklSopropyl ether ND 20 n I tert-butyl ether ND 20 " tent-Amyl methyl ether ND 20 " Surrogate Dibromofluoromethane 100% 50-150 " Surrogate 1,2-Dtchloroethane-d4 936% 50-150 " MW-3(W 107225-04)Water Sampled 12-Jul-01 13 32 Received I2-Jul-01 16 30 Ethanol ND 500 ugA I IG20011 24-Jul-01 24-Jul-01 EPA 8260B tert-Butyl alcohol ND 20 Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 tert-Amyl methyl ether ND 20 Surrogate Dibromofluoromethane 102% 50-150 " Surrogate 1 2-Dichloroethane-d4 936% 50-150 " ata Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 4 of 12