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Sequoia 1551 Industrial Road <br /> San Cartos, CA 94070-4111 <br /> 1„p Analytical (650) 232-9600 <br /> FAX(650) 232-9612 <br /> Ciettler-Ryan/Geostrategies(1) Project: Tosco(l) Sampled: 5/20/99 <br /> 6747 Sierra Court, Suite D Project Number: Unocal SS#11195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Sample Description: MW-9 <br /> Laboratory Sample Number: L905441-09 <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 Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT <br /> Purgeable Hydrocarbons as Gasoline 9050117 5/26/99 5126/99 50.0 ND ug/1 <br /> Benzene 0.500 ND " <br /> Toluene 0.500 ND " <br /> Ethylhenzene 0.500 ND " <br /> Xylenes(total) 0.500 ND " <br /> Methyl tert-butyl ether _ _ 5.00 ND " <br /> Surrogate: a,a,a-Trifluorotoluene 70.0-130 72.1 % <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260A <br /> Ethanol 9050122 5/27199 5/27/99 1000 ND ug/l <br /> Tert-butyl alcohol 200 ND " <br /> Methyl tert-butyl ether 2.00 ND " <br /> Di-isopropyl ether 2.00 ND " <br /> f1 <br /> _Y 1 ether 2.00 ND <br /> ::::fY tert-butyl ty <br /> methyl ether 2,00 ND " <br /> "Surrogate. 1,2-Dichloroethane-d4 76.0-114 106 <br /> uoia Analytical-San Carlos '*Refer to end of report for text of notes and definitions. <br /> Page 10 of 19 <br />