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1551 Industrial Road <br /> Sequoia San Carlos, CA 94070-4111 <br /> 4 Analytical <br /> (650) 232-9600 <br /> ID A <br /> I nalytical FAX(650) 232-9612 <br /> � S. <br /> Genler-Ryan/Geostrategies(l) Project: Tosco(2) Sampled: 2/22/00 <br /> 6747 Sierra Court,Suite D Project Number: UNOCAL SS#11195 Received: 2122/00 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 3/7100 <br /> Sample Description: MW-11 <br /> Laboratory Sample Number: L002194-11 <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 Pur eable Hydrocarbons C6-C12 BTEX and MTBE by DHS LUFT <br /> Purgeable Hydrocarbons as Gasoline 0030004 3/1/00 3/1/00 50.0 ND ug/1 <br /> Benzene „ It0.500 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 „ <br /> Surrogate: a,a,a-Trifluorololuene ir " 70.0-130 94.0 % <br /> Volatile Organic Oxygenated Compounds by EPA Metbod 8260A <br /> Ethanol 0030008 3/2/00 3/2/00 1000 ND ug/l <br /> Tert-butyl alcohol if 11 " 100 ND <br /> Methyl tert-butyl ether It <br /> It 2.00 2.68 " <br /> Di-isopropyl ether " " 2.00 ND <br /> Ethyl tat-butyl ether <br /> 2.00 ND <br /> Tert-amyl methyl ether " " . 2.00 ND " <br /> Surrogate: 1,2-Dichloroethane-d4 " 76.0-114 92.0 % <br /> Sequoia Analytical-San Carlos *Refer to end of reportfor text of notes and definitions. <br /> Page 12 of 20 <br />