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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHM AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(gg/L) Well Elevation to Water Elevation Thickness Ethyl- j Number Date feet feel feet feet Benzene Toluene benzene Xylem TPH-g MTBE UVB-MW2 03/03/98 7 75 1595 -820 000 2,200 190 <20 1,300 12,000 <100 UVB-MW2 03/03/98 7 75 <20* UVB-MW2 05/20/98 7 75 1582 -807 000 2,500 180 950 1,300 16,000 560 UVB-MW2 05/20/98 7 75 <14* UVB-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 7 75 1753 -978 000 230 80 25 23 760 <25 UVB-MW2 03/30/99 7 75 1663 -8 88 000 805 76 1 366 240 6,290 <20 UVB-MW2 05/05/99 7 75 1612 -837 000 693 366 457 225 5,510 358 UVB-MW2 08120199 7 75 1753 -978 000 73 0 759 120 252 2,430 104 UVB-MW2 12/06/99 7 75 1768 -993 000 23 <1 UVB-MW2 02/29/00 775 15 33 -758 000 27 12 5 7 52 320 <1 UVB-MW2 05/16/00 775 15 08 -733 000 87 14 28 4 680 7 5 UVB-MW2 09/11/00 775 1755 -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 7 75 1654 -879 000 180 210 44 193 2,700 4 4 UVB-MW2 06/21/01 775 1793 -1018 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 5 19 13 - 11 38 000 24 3 6 13 119 1,300 <0 S UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 35 0 110 41 0 1,760 h 550 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 774 1855 -1081 000 185 0 7 1 1 14 108 h 13 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 000 458 2 3 110 120 1,210 h 23 6 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 774 1954 -it 80 0 00 85 6 2 7 M 3 17 9 878 h <0 5 UVB-MW2 03/24/03 774 1895 -1121 0 00 UVB-MW2 03/25/03 7 74 -- -- -- 581 2 3 4 9 4 9 2,100 h 329 UVB-MW2 03/25/03 774 <0 5* UVB-MW2 06/11/03 774 19 13 -1139 0 00 643 3 1 206 155 1,890 h 437 UVB-MW2 06/11/03 7 74 <0 5* UVB-MW2 09/17/03 774 2055 -1281 0 00 319 2 0 15 5 180 2,060 h 377 UVB-MW2 09/17/03 7 74 <0 5* g 1projects1739421masterlwplq 120513942gw As Page 46 of 59