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Sequoia <br />� Analytical <br />404 N Wiget lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs Cpm <br />er Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite 1 Project Number Chevron SS#19-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 25 -Apr -00 17 37 <br />Volatile Organic Compounds by EPA Method 8260A <br />Sequoia Analytical - Walnut Creek <br />Reporting <br />knalyte Result Limit Units Dilution Batch Prepared Analvzed Method Note! <br />INF (W004472-01) Air Sampled 19 -Apr -00 15 20 Received 20 -Apr -00 15 20 <br />telt-Butvl alcohol ND 5000 mv/m' Air 250 OD24015 21 -Apr -00 21 -Apr 00 EPA 8260A <br />Methyl tert-butyl ether 15000 130 <br />Di -isopropyl ether ND 130 " <br />Ethyl tent -butyl ether 780 130 " <br />tert-Amyl methyl ether ND 130 " <br />Surrogate Dibromofluoromethmie 100% 50-150 " <br />Surrogate 1 2-Dichloroethane-d4 940% 50-150 " <br />Tank(W004472-03) Water Sampled 19 -Apr -00 15 00 Received 20 -Apr -00 15 20 <br />tert-Butyl alcohol <br />ND <br />500000 Ug/I 5000 OD21021 21 -Apr -00 21 -Apr -00 EPA 8260A <br />Methyl cert -butyl ether <br />240000 <br />10000 " <br />Di -isopropyl ether <br />ND <br />10000 " <br />Ethyl tert-butyl ether <br />ND <br />10000 <br />tent -Amyl methyl ether <br />ND <br />10000 " <br />Su ate Dibromofluoramethane <br />100% 50-150 " <br />Wate 12-Dichloroethaned4 <br />880% 50-150 " <br />EX -i (W004472-04) Water Sampled <br />19 -Apr -00 15 30 <br />Received 20 -Apr -00 15 20 <br />tort Butyl alcohol <br />ND <br />250000 ug4 2500 OD21021 20 -Apr -00 21 -Apr -00 EPA 8260A <br />Methyl tert-butyl ether <br />490000 <br />5000 " <br />Di -isopropyl ether <br />ND <br />5000 <br />Ethyl cert -butyl ether <br />15000 <br />5000 " <br />tert Amyl methyl ether <br />6300 <br />5000 " <br />Surrogate Dlbromofluoromethane 980% 50-150 " <br />Surrogate 1,1 Dichloroethaned4 880% 50-150 " <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />• custody documera This analytical report must be reproduced in its entirety <br />Page 5 of 10 <br />