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1551 Industrial Road <br /> --Sequoia San Carlos,CA 94070-4111 <br /> (650) 232-9600 <br /> 1CO Analytical FAX(650)232-9612. <br /> Gelder-Ryan/Gcwt:ratgpes Project Tosco Sampled 4/10/00 <br /> 6747 Sierra Court,Suite D Proect Number Unocal SS#1205 Received 4/10/00 <br /> Dublin,CA 94568 Pro ect Manager Deanna Hardin rted 4/24/00 <br /> Sample Description: - - - -- ---- -TB-LB- <br /> Laboratory <br /> TB-LB Laboratory Sample Number: L004097-01 <br /> Batch Date Date Specific Method/ Reporting <br /> Anal Number Prepared Analyzed Surrogate Limits Limit Result Units Notes* <br /> Sequoia Analytical-San Carlos <br /> Total Pur eable Hydrocarbons C6-C12 BTEX and MTBE by DHS LUFT <br /> Purgeable Hydrocarbons as Gasoline 0040080 4/17/00 4/18/00 500 ND ug/l <br /> Benzene " " " 0 500 ND " <br /> Toluene 0 500 ND " <br /> Ethylbenzene " 0 500 ND " <br /> Xylenes(total) n n n 0 500 ND " <br /> Methyl tert-butyl ether 5 00 ND " <br /> Surrogate a,a,a-Trtfluorotoluene 10 0-130 981 % <br /> • <br /> Sequoia Analytical-San Carlos *Refer to end of reportfor text of notes and definitions <br /> Page 2 of 11 <br />