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404 N Wiget Lane <br />94598 <br />Sequoia Walnut(Creek, 8&%w <br />4 FAX (925) 988-%73 <br />Analytical www sequoialabs <br />(rettler Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Pro)ectNumber Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 25 -Jul -00 10 44 <br />Volatile OrLyanlc Compounds by EPA Method 8260A <br />Sequoia Analytical - Walnut Creek <br />Reporting <br />Analyte Result Lumt Units Dilution Batch Prepared Analyzed Method Notes <br />Inf (W007080-04) Water Sampled 06--Jul-00 1139 Received 06,iul-00 13 45 <br />Ethanol <br />ND <br />1300000 <br />ugll 2500 0607018 07 -Jul -00 <br />07 -Jul -00 EPA 8260A <br />tert-Butyl alcohol <br />ND <br />250000 <br />Methyl tert-butyl ether <br />390000 <br />5000 <br />" <br />Di -isopropyl ether <br />ND <br />5000 <br />" <br />Ethyl tert-butyl ether <br />10000 <br />5000 <br />tert-Amyl methyl ether <br />ND <br />5000 <br />1,2-Dtchloroethane <br />ND <br />5000 <br />Ethylene dibromide <br />ND <br />5000 <br />Surrogate Dibromofluoromethane <br />102% <br />50-150 <br />Surrogate 12-Dichloroethane-d4 <br />960% <br />50-150 <br />Eff (Air) (W007080-05) Air Sampled <br />06 -Jul -00 12 03 <br />Received <br />06 -Jul -0013 45 <br />tert-Butyl alcohol <br />ND <br />20 <br />mg tiV Air 1 0G07014 07 -Jul -00 <br />07 -Jul -00 EPA 8260A <br />Methyl tert-butyl ether <br />ND <br />050 <br />Di -isopropyl ether <br />ND <br />050 <br />" <br />Ethyl tert-butyl ether <br />ND <br />050 <br />" <br />tert-Amyl methyl ether <br />ND <br />050 <br />Surrogate Dibromofluoromethane <br />104% <br />50-150 <br />Surrogate 1,2-Dichloroethane-d4 <br />960% <br />50-150 <br />Inf (Air) (W007080-06) Air Sampled <br />06,Iul-00 12 06 <br />Received <br />06,Iul-00 13 45 <br />tett-Butvl alcohol <br />1200 <br />100 <br />mglm' Air 5 0607014 06 -Jul -00 <br />06 -Jul -00 EPA 8260A <br />Methyl tert-butyl ether <br />1400 <br />25 <br />50 <br />07 -Jul -00 <br />Di -isopropyl ether <br />ND <br />2 5 <br />5 <br />06 -Jul -00 <br />Ethyl tert-butyl ether <br />150 <br />25 <br />tert-Amyl methyl ether <br />ND <br />25 <br />" <br />Surrogate Dibromofluoromethane <br />940% <br />50-150 <br />Surrogate 1,2 Dichloroethane-d4 <br />760% <br />50-150 <br />S-04 <br />Sequoia Analytical - Walnut Creek The results in firs report apply to the samples analysed in accordance with the chain <br />custody document This analytical report must be reproduced in its entire <br />Page 11 of 25 <br />