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` Sequoia 404 N Wiget Lane <br /> Walnut Creek CA 94598 <br /> �„� Analytical FAX(925}988-9600 <br /> {925}988-9673 <br /> ettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite I Project Number Unocal 45886 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 Lnrut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-71)(W912007-11)Water Sampled 29-Nov-99 15 55 Received 30-Nov-9919 05 <br /> Ethanol ND 500 ug/l 1 9L14011 09-Dec-99 09-Dec-99 EPA 8260A - <br /> tert-Butyl alcohol NTD 100 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " '+ <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dbromofuoromethane 126% 50-150 <br /> ,Surrogate 1,2-Dachloroethane-d4 124% 50-150 <br /> MW-7S(W912007-12)Water Sampled 29-Nov-99 15 25 Received 30-Nov-99 19 05 <br /> Ethanol ND 500 ug/l 1 9L140I1 09-Dec-99 09-Dec-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> 1 tert-butyl ether <br /> myl methyl ether <br /> Surrogate DabromofTuoromethane <br /> Surrogate 1,2-Dachloroethane-d4 114% 50-150 " <br /> MW-8S(W912007-13)Water Sampled 29-Nov-99 11 32 Received 30-Nov-99 19 05 <br /> Ethanol ND 500 ug/l i 9L14011 09-Dec-99 09-Dec-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dabromofluoromethane 122 % 50-150 <br /> Surrogate 1,2-Dachloroethane-d4 114 % 50-150Sea <br /> ltola Analytical-.Walnut Creek The results in tlas report apply to the samples analyzed to accordance with the chop of <br /> custody document This amlyRcal report must be reproduced an rrs entirety <br /> j <br /> , tectangnu ag eyProPage 17 of 27 <br />