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p 1551 Industrial Road <br /> <Y. Sequoia San Carlos.CA 9407x4,11 <br /> (650)232-9600 <br /> FAX(650)232-9612 <br /> Analytical www.sequoialabs.00m <br /> er-Ryan/Geosttategies Project Tosco Sampled: 41I0/00 <br /> 6747 Sierra Court,Suite D Project Number. Unocal SS#4409 Received: 4110/00 <br /> Dublin,CA 94568 Project Manager Deanna Hardin rted 4124/00 <br /> Sample Description: MW4 <br /> Laboratory Sample Number: L004096-05 <br /> Batch Date Date Specific Method/ Reporting <br /> Anal Number EMared AnAlEd Surrogate Limits Limit Result Units Notes' <br /> Seguala Ana cal-San Cados <br /> Total Purzeable Hydrocarbons(C6-Cl2J,BTEX and MTBE by DHS L <br /> Purgeable Hydrocarbons as Gasoline 0040094 4/19/00 4/20/00 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 " 5.00 13.6 <br /> Surrogate: a,a,a-Trifluorotoluene " 70.0-130 93.3 % . <br /> Volatile Organic ComR2unds by EPA Method 8260A <br /> 1,2-Dibromoethane 0040056 4/12100 4112100 2.00 ND ug/l <br /> 1,2-Dichloroethane 2.00 ND " <br /> Di-isopropyl ether " 2.00 ND " <br /> Ethyl tent-butyl ether 2.00 ND " <br /> yl tert-butyl ether 2.00 155qgglam " <br /> yl methyl ether 2.00 ND " <br /> ert-butyl alcohol " 100 ND " <br /> Surrogate: 1.2-Dichloroetha=44 " 76.0-114 100 % <br /> AOL <br /> oia Anaiytical-San Carlos "Refer to end of report for teat of notes and definitions <br /> Page 6 of 11 <br />