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l Sequoia 404 N Wiget Lane <br /> 4 _ Walnut Creek, CA 94598 <br /> (925)988-9600 <br /> Analytical <br /> FAX(925)988-9673 <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#15886 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 16-Dec-99 09 01 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Lunit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-4D (W912007-05)Water Sampled 30-Nov-99 10 40 Received 30-Nov-99 19 05 <br /> Ethanol ND 500 ug/l 1 9L14011 09-Dec 99 09-Dec-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 <br /> Methyl tert-butyl ether 78 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dtbromofluoromethane 124 % 50-150 " <br /> Surrogate 1,2-Dtchloroethane-d4 122% 50-150 <br /> MW-4S(W912007-06)Water Sampled 30-Nov-99 10 13 Received 30-Nov-99 19 05 <br /> Ethanol ND 500 ug/1 1 9L14011 09-Dec-99 09-Dec-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 to " <br /> Methyl tert-butyl ether 13 20 <br /> Di-Isopropyl ether ND 20 <br /> I tert-butyl ether ND 20IR " <br /> Amyl methyl ether ND 20 to <br /> Surrogate Dibromgfluoromethane 124 % 50-150 11 " <br /> Surrogate 1,2-Dichloroethane-d4 122 % 50-150 " <br /> MW-5D(W912007-07)Water Sampled 30-Nov-99 09 25 Received 30-Nov-9919 05 <br /> Ethanal ND 500 ug/l 1 9L14011 09-Deo-99 09-Dec-99 EPA 8260A <br /> text-Butyl alcohol ND 100 " " " 1. <br /> Methyl tert-butyl ether 47 20 to <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 it <br /> tert-Amyl methyl ether ND 20 to <br /> Surrogate Dlbromofluoromethane 126% 50-150 <br /> Surrogate 1,2-Dichloroethane-l4 126% 50-150 " <br /> 40 uola Analytical-Walnut Creek The results to thus report apply to Me samples analyzed nn aecor"ce with the churn of <br /> custody document Ths analytncal report must be reproduced to ens entirety <br /> N74 <br /> aliQeg , je anagex Page 15 of 27 <br />