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1 Sequoia 1551 Industrial Road <br /> San Carlos,CA 94070-4111 <br /> (650)232-9600 <br /> mW Analytical <br /> FAX(650) Z32-9612 <br /> 6ettler-Ryan/Geostrategies(I) Project: Tosco(1) Sampled: 5/20199 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#11195 Received: 5120/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Sample Description: MW-6 <br /> Laboratory Sample Number: L905441-07 <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 9050116 5126/99 5/26/99 50.0 ND ug/l <br /> Benzene " it " 0.500 ND " <br /> Toluene 0.500 ND " <br /> Ethylbenzene 0.500 ND <br /> Xylenes(total) 0.500 ND " <br /> Methyl tert-butyl ether " " 5.00 ND IF <br /> Surrogate: a,a,a-Trifluorotoluene 70.0-130 93.8 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260A <br /> Ethanol 9050122 5/27/99 5/27/99 1000 ND ug/l <br /> Tert-butyl alcohol " " " 200 ND " <br /> Methyl tert-butyl ether " " IF <br /> 2.00 2.39 " <br /> Di-isopropyl ether 2.00 ND IF <br /> Ftbyl tert-butyl ether 2.00 ND " <br /> ==�-amyl methyl ether 2.00 ND IF <br /> Surrogate: 1,2-Dichloroethane-d4 " 76.0-114 105 <br /> juoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 8 of 19 <br />