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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Prosect Chevron <br />6747 Sierra Court Suite J 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 />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs cam <br />Reported <br />19 -Apr -00 1141 <br />Reporting <br />analyte Result Limit Units Dilution Batch Prepared Analvzed Method Note <br />Inf (15 25) (W004304-04) Air Sampled 12 -Apr -00 15 25 Received 13 -Apr -00 17 10 <br />lert-Butyl alcohol <br />ND <br />2000 <br />mgrm' Air 100 OD14016 14 -Apr -00 <br />14 -Apr -00 EPA 8260A <br />Methyl tert-butyl ether <br />12000 <br />50 <br />A-01 <br />Di-isopropvl ether <br />ND <br />50 <br />Ethyl tent -butyl ether <br />430 <br />50 <br />" <br />tent -Amyl methyl ether <br />80 <br />so <br />Surrogate Dtbromofluoromethane <br />106% <br />50-150 <br />Surrogate 1,2-Dichloroethane-d4 <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 />ug/l 50 OD13012 14 -Apr -00 <br />14 -Apr -00 EPA 8260A <br />Methyl tent -butyl ether <br />500000 <br />10000 <br />5000 <br />19 -Apr -00 " <br />Di -isopropyl ether <br />ND <br />100 <br />50 <br />14 -Apr -00 " <br />Ethyl tent -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 />50450 <br />Sequoia Analytical - Walnut Creek <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in irs entirely <br />i*. <br />Page 3 of 7 <br />