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� � � i• � � � � 1• i i i i i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) feet feet Benzene Toluene benzene Xylenes TPH-g MTBE UVB-MW2 02/28/97 7 75 1796 -- 000 200 1,100 190 1,700 9,400 <2 5 UVB-MW2 05/08/97 7 75 1114 -12 19 000 092 <0 5 <0 5 17 58 3 0 UVB-MW2 d 08/26/97 7 75 20 87 -13 12 000 12,000 23,000 2,700 13,000 120,000 1,300 UVB-MW2 10/02/97 775 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 UVB-MW2 11/11/97 7 75 2143 -13 68 000 <0 5 099 066 41 <50 <2 5 UVB-MW2 03/03/98 7 75 1595 -820 0 00 2,200 190 <20 1,300 12,000 <100 UVB-MW2 03/03/98 775 <20* UVB-MW2 05/20/98 7 75 1582 -807 000 2,500 180 950 1,300 16,000 560 UVB-MW2 05/20/98 775 <14* UVB-MW2 08/19/98 7 75 1703 -9 28 000 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 I 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 08/20/99 7 75 1753 -9 78 000 730 759 120 25 2 2,430 104 UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 9 4 UVB-MW2 02/29/00 775 1533 -758 0 00 27 12 5 7 5 2 320 <1 UVB-MW2 05/16/00 775 1508 -733 000 87 14 2 8 4 680 7 5 UVB-MW2 09/11/00 7 75 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 03/08/01 775 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 1913 -1138 000 24 3 6 1 3 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 7 74 1800 -1026 000 112 350 110 410 1,760 h 55 0 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 7 74 18 55 -1081 000 18 5 0 7 1 1 14 108 h 13 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 7 74 1978 -1204 000 45 8 2 3 11 0 120 1,210 h 236 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 774 1954 -1180 000 85 6 2 7 14 3 17 9 878 h <0 5 UVB-MW2 03/24/03 774 1895 -1121 000 UVB-MW2 03/25/03 774 -- -- -- 58 1 2 3 4 9 4 9 2,100 h 329 g%projects1739421mastcAwp\gO60513942gw xls Page 47 of 59