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Sequoia 1551 Industrial Road <br /> San Carlos,CA 94070-41 11 <br /> 4D- A (650)23,2-9600 <br /> Analytical <br /> FAX(650)232-9612 <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) Sampled: 5/20/99 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#11195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Sample Description: MW-5 <br /> Laboratory Sample Number: L905441-06 <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 W&C12),BTEX and MTBE by DIES LUFT <br /> Purgeable Hydrocarbons as Gasoline 9050117 5/26/99 5/26/99 50.0 ND ug/l <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 9050125 5127/99 5/27/99 250 2920 " <br /> Surrogate: a,a,a-Trifluorotoluene 9050117 5/26/99 5/26199 70,0-1.30 79.7 % <br /> Volatile Oreanic Oxyeenated Compounds by EPA Method 8260A <br /> Ethanol 9060017 6/2/99 6/2/99 50000 ND ug/l <br /> Tert-butyl alcohol 11 11 <br /> " 10000 ND " <br /> Methyl tert-butyl ether 11 <br /> IF <br /> " 100 5000 " <br /> Di-isopropyl ether it It <br /> " 100 ND IF <br /> .-FtyI tert-butyl ether IF100 ND IF <br /> _: amyl methyl ether _ 100 ND IF <br /> Surrogate: 1,2-Dichloroethane-d4 IF it IF 76.0-114 101 <br /> I <br /> i <br /> uoia Analytical-San Carlos *Refer to end of report for test of notes and definitions. <br /> Page 7 of 19 <br /> I <br />