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1551 industrial Road <br /> Sequoia San Carlos,CA 94070-4111 <br /> (650)2329600 <br /> FAX(650)232-9612 <br /> Analytical www.sequoWabs.com <br /> Gedler-Ryan/Geostrategies(1) Project: Tosco(2) Sampled: 5/5/00 <br /> 6747 Sierra Court,Suite D Project Number. Tosco(Unocal)SS#11195 Received: 5/5/00 <br /> Dublin,CA 94568 Project Mana cr: Deanna Hardin R orted: 5/22/00 <br /> Total Purgeable Hydrocarbons(C& M),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-San Carlos <br /> Batch Date Date Surrogate Reporting <br /> Anal Number Prepared Anal Limits Limit Result Units Notes* <br /> MW4(continued) L005052-05 Water <br /> Methyl tert-butyl ether 0050085 5/18/00 5118100 5.00 151 ug/l <br /> Surrogate: ga.a-Trifluorotoluene " " " 70.0-130 116 % <br /> MW-5 L005052-06 Water 2 <br /> Purgeable Hydrocarbons as Gasoline 0050094 5/20/00 5/20100 250 ND u9/1 <br /> Benzene It it „ 2.50 ND ” <br /> Toluene 2.50 ND " <br /> Ethylbenvme " „ 2.50 ND " <br /> Xylenes(total) „ " " 2.50 ND „ <br /> Methyl tert-butyl ether 5/18/00 100 4860 3 <br /> Surrogate: a,a,a-Trifluorotoluene " " 5/20100 70.0-130 91.6 % <br /> MW-6 L005052-07 Water <br /> Purgeable Hydrocarbons as Gasoline 0050085 5118/00 5/18/00 50.0 ND ugll <br /> Benzene 0.500 ND <br /> Toluene " 0.500 ND " <br /> Ethylbenzene " 0.500 ND <br /> Xylenes(total) " " if 0.500 ND " <br /> Methyl tert-butyl ether " " „ 5.00 ND <br /> Surrogate: a,a,a-M luorotoluene " " 70.0-130 107 % <br /> Mw-8 L005052-08 Water <br /> Purgeable Hydrocarbons as Gasoline 0050085 5/18/00 5/18/00 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-Trifluorotoluene " 70.0-130 107 % <br /> PAW-9 L005052-09 Water <br /> Purgeable Hydrocarbons as Gasoline 0050085 5118/00 5/18/00 50.0 ND ug/l <br /> Benzene " It <br /> „ 0.500 ND „ <br /> Toluene It <br /> " ” 0.500 ND If <br /> Ethylbenzene it It <br /> It 0.500 ND <br /> Xylenes(total) If " if 0.500 ND <br /> Methyl tert-butyl ether IV5.00 ND <br /> Surrogate: a,a,a-Trifluorotoluene " 70.0-130 92.0 % <br /> MW-10 L005052-10 Water <br /> Purgeable Hydrocarbons as Gasoline 0050085 5/18/00 5/19100 50.0 ND ug/l <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 3 of 13 <br />