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Sequoia , Industrial Road <br /> San Carloslos,CA 94070-4111 <br /> t-5)-„ Analytical FAX(650232-9610 <br /> (651)) 232-9612 <br /> bettler-Ryan/Geostrategies(1) Project: Tosco(1) Sampled: 5/20/99 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#1 l 195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported- 6/3199 <br /> Sample Description: MW-10 <br /> Laboratory Sample Number: L905441-10 <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 5/26/99 50.0 ND ug/1 <br /> Benzene 1. 110.500 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-Triuorotoluene 70.0-130 79.8 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260A <br /> Ethanol 9050122 5/27/99 5/27/99 1000 ND ug/1 <br /> Tert-butyl alcohol IF <br /> " 11 200 ND IF <br /> Methyl tert-butyl ether IF2.00 352 IF <br /> Di-isopropyl ether " " " 2.00 ND " <br /> :5; yl tert-butyl ether 2.00 ND " <br /> methyl ether _" 2.00 ND IF <br /> Surrogate: 1,2-Dichloroethane-d4 FF <br /> If <br /> " 76.0-114 102 <br /> Uoia Analytical-San Carlos *Refer to end ofreport for text of notes and definitions. <br /> Page I 1 of 19 <br />