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Sequoia 1551 Industrial Road <br /> San Carlos, CA 94070-4111 <br /> (650)232-9600 <br /> Analytical <br /> FAX(650)232-9612 <br /> i <br /> irettler-Ryan/Geostrategies(I) Project: Tosco(1) Sampled: 5/20/99 <br /> 6747 Sierra Court, Suite D Project Number: Unocal SS#11195 Received: 5120199 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Sample Description: MW-11 <br /> Laboratory Sample Number: L905441-111 <br /> Batch Date Date Specific Method/ Reporting <br /> Analyte Number Prepared Analyzed Surrogate Limits Limit Result Units Notes* <br /> Sequoia Analytical-San Carlos <br /> Total Pumeable Hydrocarbons(C6-C12).BTEX and MTBE by DHS LUFT <br /> Purgeable Hydrocarbons as Gasoline 9050117 5/26199 5/26/99 50.0 ND ug/1 <br /> Benzene " " " 0.500 0.989 " <br /> Toluene IF <br /> " " 0.500 ND " <br /> Ethylbenzene " " " 0.500 ND " <br /> Xylenes(total) IF 0.500 ND " <br /> Methyl tert-butyl ether _9050125 5/27/99 5127199 20 904 11Surrogate: a,a,a-Trifl'uorotaluene 9050117 5/26/99 5/26199 70.0-1.30 79.3 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260A <br /> Ethanol 9060017 612199 613199 25000 ND ug/l <br /> Tert-butyl alcohol " If <br /> IF <br /> 5000 ND " <br /> Methyl tert-butyl ether IF <br /> 50.0 1780 " <br /> Di-isopropyl ether 50.0 ND " <br /> F_..thyl tert-butyl ether 50.0 ND <br /> t-amyl methyl ether "_ 50.0 ND " <br /> "=;arrogate: 1,2-Dichloroethane-d4 FFIF76.0-114 101 <br /> i <br /> i <br /> E <br /> i <br /> I <br /> i <br /> uoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> s. <br /> Page 12 of 19 <br />