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4D (65Sequoia los, Industrial Road <br /> San Carlos,CA 94070-4111 <br /> Analytical FAX <br /> 0)232-9600 <br /> (650) 232-9612 <br /> Sequoia-Walnut Creek Project: Gettler-Ryan Inc./TOSCO Sampled: 8/11/99 <br /> 404 N.Wigett Lane Project Number. W908271/Unocal SS#11195, 180175.85 Received: 8/18/99 <br /> Walnut Creek,CA 94568 Project Manager: Julianne Fegley Reported: 8/26/99 <br /> Sample Description: W908271-05/MW-4 <br /> Laboratory Sample Number: L909135-05 <br /> Batch Date Date Specific Method/ Reporting <br /> Analyte Number Prepared Analyzed Surrogate Limits Limit Result Units Notes* <br /> Senuoia Analytical-San Carlos <br /> Total Pureeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS_LUFT <br /> Purgeable Hydrocarbons as Gasoline 9080103 8/19/99 8/20/99 50.0 297 ug/1 <br /> Benzene " " " 0.500 ND " <br /> Toluene It <br /> 0.500 ND " <br /> Ethylbenzene 0.500 ND " <br /> Xylenes(total) 0.500 ND " <br /> Methyl tert-butyl ether 9080145 8/25/99 8/25/99 12.5 437 " <br /> Surrogate: a,a,a-Tris luorotoluene 9080103 8/19/99 8/20/99 70.0-130 104 <br /> { <br /> I <br /> I <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> f <br /> f <br /> Page 6 of 17 <br />