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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration (uglL) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date (feet) (feet) _(feet) (feet)_ Benzene Toluene benzene Xylenes TPH-g MTBE <br /> UVB-MW2 08/19/98 7 75 <2 0* <br /> UVB-MW2 11/18/98 775 1753 -978 000 230 80 25 23 760 <25 <br /> UVB-MW2 03/30/99 775 1663 -888 000 805 76 1 366 240 6,290 <20 <br /> UVB-MW2 05/05/99 775 1612 -837 000 693 366 457 225 5,510 358 <br /> UVB-MW2 08/20/99 775 1753 -978 000 730 759 120 252 2,430 104 <br /> UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 9 4 <br /> UVB-MW2 02/29/00 7 75 15 33 -758 000 27 12 5 7 5 2 320 <1 <br /> UVB-MW2 05/16/00 7 75 1508 -733 000 87 14 28 4 680 7 5 <br /> UVB-MW2 09/11/00 775 1755 -980 000 330 71 29 27 2,100 <2 5 <br /> UVB-MW2 12/13/00 7 75 1741 -966 0 00 120 180 19 124 1,800 <2 5 <br /> UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 <br /> UVB-MW2 06/21/01 775 1793 -1018 000 38 53 6 307 1,200 19 <br /> UVB-MW2 06/21/01 775 <5* <br /> UVB-MW2 09/20/01 7 75 19 13 -11 38 000 24 3 6 1 3 119 1,300 <0 5 <br /> UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* <br /> UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 410 1,760 h 550 <br /> UVB-MW2 03/05/02 7 74 <0 5* <br /> UVB-MW2 06/11/02 7 74 18 55 -1081 000 185 0 7 1 1 14 108 h 1 3 <br /> UVB-MW2 06/11/02 7 74 <0 5* <br /> UVB-MW2 09/10/02 774 1978 -1204 0 00 458 2 3 110 12 0 1,210 h 236 <br /> UVB-MW2 09/10/02 774 <0 5* <br /> UVB-MW2 12/18/02 774 1954 -1180 000 856 2 7 143 179 878 h <0 5 <br /> UVB-MW2 03/24/03 774 1895 -1121 000 -- -- -- -- <br /> UVB-MW2 03/25/03 774 -- -- -- 581 2 3 4 9 4 9 2,100 h 329 <br /> UVB-MW2 03/25/03 7 74 <0 5* <br /> UVB-MW2 06/11/03 774 1913 -1139 000 643 31 206 155 1,890 h 43 7 <br /> UVB-MW2 06/11/03 7 74 <0 5* <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MWI and UVB-MW2 Resampled on 2 October 1997 <br /> e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram <br /> g 1p%jects1739421ivasterlwp1gO60313942gw xls Page 47 of 48 <br />