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i Table • Groundwater Monitoring Data and Analytical Results Chevron Service Station#9-8264 3775 Tracy Boulevard I Verticai Measurements are in feet Tracy,California Analytical results are in parts per billion(ppb Well Ground Depth Total DATE Read Water To SPH SPH SPH Notes TPH- TPR- Benzene Toluene Ethyl- Xylenes MTBE TOG EPA EPA Elev. Elev. Water Thickness Removed Removed Diesel Gasoline Benzene (EPA 8020) 8270 8010 MW-2 05/24/96 1898 907 991 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - -- -- 08/20/96 1898 798 1100 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- - - 11/05/96 1898 829 1069 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- - 01/07/97 1898 1013 885 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - -- - 02/07/97 1898 1025 873 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - -- 05121197 1898 825 1073 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - -- -- 08127l97 1898 867 1031 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- 11/24/97 1898 851 1047 -- -- -- -- 81*0 <50 <0 5 <0 5 <0 5 <0 5 29 02/12/98 1898 1155 743 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <05 <2 5 -- - 06/09/98 1898 459 1439 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - - 08/10/98 1898 820 1078 -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 - - 11/24/98 1898 828 1070 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 39 - -- 03/05/99 1898 924 974 -- -- - <50 <50 <0 5 <0 5 <05 <0 5 <2 0 - 06/01/99 1899 852 1046 -- -- -- -- 75 3** <50 <0 S <0 5 <05 <0 5 <2 0 - -- 08/30/99 1898 8 11 1087 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <6 2 -11/23/99 1898 843 1055 -- -- -- <50 <50 <0 5 <05 <0 5 <0 5 <2 5 - 02102/00 1898 856 1042 -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 <2 5 05/18/00 1898 866 1032 000 -- -- -- <50 <50 <0 50 <0 50 <0 50 <0 50 <2 5 - - 08/11/00 1898 7.88 11.10 0.00 -- -- -- <50 <50 <0.50 <0 50 <0 50 <0 50 56 -- -- - **Chromatogram pattern indicated an unidentified hydrocarbon I I 9 8264 xis/#386854 2 As of 08/11/00