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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE UVB-MW2 05/20/98 775 <14* IJVB-MW2 08/19/98 7 75 1703 -928 000 14 4 8 2 7 24 250 16 UVB-MW2 08/19/98 775 <2 0* UVB-MW2 11/18/98 775 1753 -978 000 230 80 25 23 760 <25 UVB-MW2 03/30/99 775 1663 -8 88 000 805 761 366 240 6,290 <20 UVB-MW2 05/05/99 775 1612 -837 000 693 366 457 225 5,510 35 8 UVB-MW2 08/20/99 775 1753 -978 000 730 759 120 252 2,430 104 UVB-M W 2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 9 4 IJVB-MW2 02/29/00 7 75 1533 -7 58 000 27 12 5 7 5 2 320 <1 IJVB-MW2 05/16/00 775 1508 -733 000 87 14 2 8 4 680 7 5 UVB-MW2 09/11/00 7 75 17 55 -980 000 330 7 1 29 27 2,100 <2 5 UVB-MW2 12/13/00 775 1741 -966 000 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 UVB-MW2 06/21/01 7 75 1793 -10 18 000 38 53 6 307 11200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 19 13 -1138 000 24 3 6 13 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 1 1 9 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 410 1,760 h 550 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 774 1855 -1081 000 185 07 11 14 108 h l3 UVB-MW2 06/11/02 774 <0 5* IJVB-MW2 09/10/02 774 1978 -1204 000 45 8 2 3 11 0 120 1,210 h 23 6 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 774 1954 -1180 000 856 2 7 143 179 878 h <0 5 UVB-MW2 03/24/03 774 1895 -1121 000 -- -- -- -- -- -- I1VB-MW2 03/25/03 774 -- -- -- 581 2 3 4 9 4 9 2,100 h 329 UVB-MW2 03/25/03 774 <0 5* IJVB-MW2 06/11/03 774 19 13 -1139 000 643 3 1 206 15 5 1,890 h 437 UVB-MW2 06/11/03 774 <0 5* U1B-MW2 09/17/03 774 2055 -1281 000 319 2 0 15 5 180 2,060 h 377 UVB-MW2 09/17103 774 <0 5* U NIB-M W 2 12/08/03 774 2049 -1275 000 400 3 2 4 8 9 1 2,280 h 13 9 UVB-MW2 12108103 774 <0 5* 1 6}projeasV39421masterlwplq I203U942gw x1s Page 42 of 51