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1551 Industrial Road <br /> Sequoia San CAdor.,6 Z32 <br /> r` FAX(650)232-%12 <br /> Analytical '"ww.sequoWahs.°°m <br /> Gettler-RyanlGeostrategies(1) Project: Tosco(2) Sampled: 11/13100 <br /> 6747 Sierra Court,Suite J Project Number: Unocal SS#11195 Received: 11/13/00 <br /> Dublin,CA 94568 Project Manager, Deanna Harding Reported: 11129/00 <br /> Sample Description: MW-11 <br /> Laboratory Sample Number: L011152-11 <br /> Hatch Date Date Specific Method/ Reporting <br /> Analyte Number Prepared Analyzed Surrogate Limits Limit Result Units Notes* <br /> Seguoia Analitical-San Carlos <br /> Total Purgeable Hydrocarbons C6-C12 BTEX and MTBE by DHS LUFI <br /> Purgeable Hydrocarbons as Gasoline 0110116 11/22/00 11/22/00 50.0 ND ug/l <br /> Benzene it of 11 0.500 ND " <br /> Toluene it 0.500 ND " <br /> Ethylbenzene 0.500 ND " <br /> Xylenes(total) „ 0.500 ND „ <br /> Methyl tert-butyl ether 5.00 135 " <br /> Surrogate: a,a,a-Difluorotoluene 70.0-130 99.3 <br /> Voistile Orgaide Oxygenated Compounds-by-EPA Method 8260B <br /> Tea#-butyl alcohol 0110084 11/16/00 11/16/00 100 ND u9/1 <br /> Methyl tent-butyl ether " " " 2.00 137 " <br /> I.�_:Aopropyl ether 2.00 ND It <br /> 1: ;;:;;tart butyl ether " 2.00 ND <br /> Tier--amyl methyl ether " " 2.00 ND " <br /> Surrogate: 1,2-Dichloroethane-d4 76.0-114 98.2 % <br /> i <br /> i <br /> Sequoia Analytical-San Carlos *Refer to end of reportfor text of notes and definitions. <br /> Page 12 of 19 <br />