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1551 Industrial Road Sequoia San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 Analytical www sequolalabs com Gettler-Ryan/Geostmtepes(I) Project Unocal(1) Sampled 8/31/00 to 9/l/00 6747 Sterna Court,Suite J Protect Number Former Unocal SS#(0187) Received. 9/1/00 Dublin,CA 94568 Pro ect Manager Deanna Harding Reported 9/18/00 Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT Sequoia Analytical-San Carlos Batch Date Date Surrogate Reporting lAnalyte Number Prepared Analyzed Limits Limit Result Units Notes* U-9(continued) L009012-10 Water Benzene 0090067 9113100 9/13/00 0 500 ND ug/1 Toluene " 0 500 ND " Ethylbenzene 0 500 ND " Xylenes(total) „ 0 500 ND " Methyl tent-butyl ether n 5 00 ND " Surrogate a,a,a-Tnfluorotoluene " 700-130 990 % U-10 L009012-11 Water Purgeable Hydrocarbons as Gasoline 0090067 9/13100 9/13/00 500 ND 119/1 Benzene n n n 0 500 ND ^ Toluene " 0 500 0.708 " Ethylbenzene 0 500 ND " Xylenes(total) n n n 0 500 ND TM MAktcrt-butyl ether 5 00 ND " SulWate a,a,a-Tnfluorotoluene " " 700-130 --� 979 % U-11 L009012-12 Water Purgeable Hydrocarbons as Gasoline 0090067 9/13100 9113/00 500 ND u9/1 Benzene " 0 500 ND " Toluene " " " 0 500 0.603 TM £thylbenzaie ^ 0 500 ND " Xylenes(total) 0 500 ND " Methyl tert-butyl ether " " 500 ND " Surrogate a,a,a-Tntfluorotoluene " " " 700-130 107 % U-12 L009012-13 Water Purgeable Hydrocarbons as Gasoline 0090067 9/13100 9113/00 500 257 119/1 1 Benzene " 91 " 0 500 17.3 " Toluene 0 500 1.07 " Ethylbenzene 0 500 164 " Xylenes(total) " „ 0 500 2.56 " Methyl tert-butyl ether " " " 500 8.54 " Surrogate a,a,a-Trif7uorotoluene " ff 700-130 104 % U_13 L009012-14 Water Purgeable Hydrocarbons as Gasoline 0090067 9113100 9113/00 500 164 119/1 1 Benzene " 0 500 51.1 " Toluene 0 500 2.59 ^ Ethylbenzene " 0 500 163 " Xylenes(total) ^ 0 500 8.89 " Acquoia ��ytyical l ether " S 00 ND "-San Carlos *Refer to end of report for text of nates and defittlhons Page 4 of 19