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Sequoia <br />� Analytical <br />Gettler Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite ! Project Number Chevron # 9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A <br />Sequoia Analytical - Walnut Creek <br />444 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988 9673 <br />www sequoialabs corn <br />Reported <br />19 -Apr -00 1141 <br />Reporting <br />knalyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br />Inf (15 25) (W004304-04) Air Sampled 12 -Apr -00 1.5 25 Recen ed 13 -Apr -00 17 10 <br />tert-Butyl alcohol <br />ND <br />2000 rng�m' Air 100 <br />Methyl tent-butvl ether <br />12000 <br />50 <br />Di-isopropvl ether <br />ND <br />50 <br />Ethyl tent -butyl ether <br />430 <br />50 <br />tert-Amyl methyl ether <br />80 <br />50 <br />Surrogate Dibromofluoromethane <br />106% <br />50-150 <br />Surrogate 1 2-Dichloroethane-i4 <br />980% <br />50-150 <br />EX -1 (W004304-05) Water Sampled <br />12 -Apr -00 16 23 <br />Received <br />13 -Apr -00 17 10 <br />tert-Butyl alcohol <br />12000 <br />5000 <br />ugll 50 <br />Methyl tert-butylether <br />500000 <br />10000 <br />5000 <br />Di -isopropyl ether <br />ND <br />100 <br />50 <br />Ethyl tert-butyl ether <br />13000 <br />1000 <br />500 <br />tert-Amyl methyl ether <br />4700 <br />100 <br />50 <br />Surrogate Dibromofluoromethane <br />114% <br />50-150 <br />Surrogate 1,2-Dichloroethane-d4 <br />100% <br />50-150 <br />OD14016 14 -Apr 00 14 -Apr 00 EPA 8260A <br />" A01 <br />OD13012 14 -Apr -00 14 -Apr -00 EPA 8260A <br />19 Apr -00 " <br />14 -Apr -00 " <br />Sequoia Analytical - Walnut Creek The results m this report apply to the samples analyzed in accordance with the chain of <br />custody document This analyucal report must be reproduced in its entirety, <br />Page 3 of 7 <br />N <br />