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• i • TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration L Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE 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 5 092 119 330 <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 0 7 1 1 14 108 h 13 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -12 04 000 458 23 110 120 1,210 h 236 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 7 74 1954 -1180 000 856 2 7 14 3 179 878 h <0 5 UVB-MW2 03/24/03 774 1895 -1121 000 UVB-MW2 03/25/03 774 -- -- -- 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 000 643 3 1 206 155 1,890 h 437 UVB-MW2 06/11/03 774 <0 5* UVB-MW2 09/17/03 774 2055 -1281 000 31 9 2 0 155 180 2,060 h 377 UVB-MW2 09/17/03 774 <0 5* UVB-MW2 12/08/03 774 2049 -1275 000 400 3 2 48 91 2,280 h 13 9 UVB-MW2 12/08/03 774 <0 5* UVB-MW2 03/02/04 774 1904 -1130 000 754 2 8 2 7 6 0 2,640 h 270 UVB-MW2 03/02/04 774 <0 5* UVB-MW2 06/28/04 774 2028 -1254 000 -- -- -- -- -- -- UVB-MW2 06/29/04 774 -- -- -- 117 5 0 4 8 106 2,550 h 240 UVB-MW2 06/29/04 7 74 <0 5* UVB-MW2 09/27/04 7 74 21 17 -1343 000 -- -- -- -- -- -- UVB-MW2 09/28/04 7 74 -- -- -- 211 340 570 167 3,660 h <5 UVB-MW2 12/01/04 7 74 20 77 -1303 000 -- -- _ _ -- -- UVB-MW2 12/02/04 7.74 -- -- -- 193 319 209 644 4,000 h 414 UVB-MW2 12/02/04 7 74 <0 5* V1 05/02/91 857 3174 -23 17 000 20,000 49,000 4,700 25,000 130,000 -- V1 07/16-17/91 857 3270 -2413 000 14,000 44,000 3,000 15,000 170,000 VI 10/15/91 857 3325 -2468 000 18,000 51,000 4,200 23,000 200,000 -- Vl 01(28192 857 3151 -22 94 Sheen 20,000 58,000 2,400 23,000 150,000 -- g lpro)ccts1739421maslerlwp1g12O413942gw As Page 47 of 58 i 8 w f