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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 ( L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V3 03/30/99 763 1595 -832 000 <25 781 2,180 8,630 37,500 <100 V3 05/05/99 763 1595 -8 32 000 <10 389 1,040 4,500 14,400 774 V3 08/20/99 763 -- -- V3 12/06/99 763 -- V3 02/29/00 763 '- V3 05/16/00 763 -- __ _ V3 09/11/00 763 1760 -997 0 00 85 20 82 36 390 <0 5 V3 12/13/00 763 1745 -982 000 11 110 440 1,150 6,000 <2 5 V3 03/08/01 7 63 1670 -907 000 <25 640 2,100 8,900 40,000 <25 V3 06/21/01 763 1807 -1044 000 <0 5 3 1 20 346 1,500 30 V3 06/21/01 763 <5* V3 09/20/01 763 1925 -11 62 000 9 8 18 46 132 950 <0 5 V3 12/04/01 7 61 1904 -1143 000 <50 260 960 4,200 19,000 <5* V3 03/05/02 761 1820 -1059 000 -- V3 03/06/02 761 -- V3 03/06/02 761 -- -- 260 484 1,390 5,280 13,900 h 102 <10* V3 06/11/02 7 61 1867 -1106 Sheen 72 0 117 548 2,000 8,300 h 100 V3 06/11/02 7 61 <2 5* V3 09/10/02 7 61 1998 -1237 000 <50 260 970 3,790 14,100 h 700 V3 09/10/02 7 61 <S0* V3 12/18/02 7 61 1971 -12 10 000 <50 380 1,310 5,260 17,000 h <50 V3 03/24/03 7 61 19 10 -1149 0 00 V3 03/25/03 7 61 -- - V3 03/25/03 761 -- 340 398 1,760 7,240 27,500 h 920 <5* V3 06/11/03 7 61 1930 -1169 000 83 6 320 1,430 5,950 21,900 h 182 V3 06/11/03 7 61 <5* V4 05/02/91 938 32 10 -2268 005 31,000 58,000 5,700 29,000 200,000 V4 07116-17191 938 3306 -2365 0 04 Not sampled-LPH V4 10/15/91 938 3374 -2434 003 Not sampled-LPH V4 01/28/92 938 31 92 -2254 Sheen 23,000 63,000 5,300 27,000 220,000 V4 04/30/92 938 3148 -2209 0 01 Not sampled-LPH -- g�pro3ec�s%739421masier\wp\gp603U942gw xIs Page 43 of 48