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Sequoia 1551 Industrial [toad <br /> San Carlos,CA 94070-4111 <br /> {650} 232-9600 <br /> Analytical <br /> FAX{650} 232-9612 <br /> Oettler-Ryan/Geostrategies(1) Project: Tosco(l) Sampled: 5120199 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#11195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 613199 <br /> Sample Description: TB-LB <br /> Laboratory Sample Number: L905441-01 <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-C.12),BTEX and MTBE by DHS L.UFT <br /> Purgeable hydrocarbons as Gasoline 9050116 5/26/99 5126199 50.0 ND ug/1 <br /> Benzene 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 <br /> Surrogate: a,a,a-Trij2uorotoluene 70.0-130 96.4 <br /> .4uoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 2 of 19 <br /> I <br />