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i • • TABLE 2 GROUNDWATER MONITORING DA1A,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(pg/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 7 75 <14* UVB \1W2 08/19/98 775 1703 -928 000 14 4 8 2 7 24 250 16 UVB-1\52 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 76 1 366 240 6,290 <20 UVB-MW2 05/05/99 775 16 12 -8 37 000 693 366 457 225 5,510 35 8 UVB-MW2 08/20/99 775 1753 -978 000 730 759 120 25 2 2,430 104 UVB-MW2 12/06/99 775 1768 -9 93 000 23 <1 <1 <1 600 9 4 UVB-MW2 02/29/00 775 15 33 -7 58 000 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 09/11/00 775 1755 -9 80 0 00 330 7 1 29 27 2,100 <2 5 UVB-1,I'A'2 12/13/00 775 1741 -966 000 120 Bo 19 124 1,800 <2 5 UVB-1%11�2 03/08/0) 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 19 13 -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 1 1 9 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 35 0 11 0 410 1,760 h 55 0 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 774 1855 -1081 000 I8 5 0 7 l 1 1 4 108 It 1 3 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 0 00 458 23 Ho 12 0 1,210 h 23 6 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 774 1954 -11 80 000 85 6 2 7 143 179 878 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 UVB-MW2 03/25/03 774 <0 5* UVB-MW2 06/11/03 774 19 13 -1139 000 64 3 3 1 206 15 5 1,890 h 437 UVB-MW2 06/11/03 774 <0 5* UVB-MW2 09/17/03 774 2055 -1281 000 31 9 2 0 15 5 180 2,060 h 377 UVB-MW2 09/17/03 774 <0 5* UVB-MW2 12/08/03 774 2049 -1275 000 400 3 2 4 8 91 2,280 h 13 9 UVB-MW2 12/08/03 774 <0 5* gllprojects173942\juasterlwp\gO30413942gw xls Pa6e 43 of 52