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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 MWI 11/16/88 7 76 2307 -1531 000 <0 5 9 5 <0 5 <0 5 130 MWI 02/09/89 776 2264 -1488 000 17 0 2 0 2 0 6 <250 -- MWI 05/31/89 776 2926 -21 50 000 <0 5 <0 5 <0 5 0 8 <250 MWI 08/17/89 776 2587 -18 11 0 00 <0 5 <0 5 <0 5 <0 5 <250 MWI 12/19/89 776 2922 -21 46 000 <0 5 19 <0 5 <0 5 <250 -- MWI 03/21/90 776 2746 -1970 000 <0 5 <0 5 08 2 9 80 MWI 05/17/90 776 2824 -2048 000 <0 5 4 5 <0 5 <0 5 120 -- M W I 09/25/90 776 2959 -2183 000 <0 5 7 0 1 0 4 7 170 MWI 12/19/90 776 Dry MWI 01/30/91 776 Dry MWI 05/02/91 776 Dry MWI 07116-17/91 7 76 Dry MWI. 10/15/91 776 2995 -22 19 a 000 MWI 01/28/92 776 2970 -2194 a 000 MWI 04/30/92 776 2926 -2150 000 -- -- -- _- __ MWI. 08/13/92 776 2985 -22 09 000 -- -- -- _- __ M W 1 10/08/92 776 Dry MWI 02/23/93 776 2855 -2079 000 MWI 05/18/93 776 27 12 -1936 000 19 <0 5 28 1 8 950 MWI 08/22/93 776 2734 -1958 000 8 9 <0 5 <0 5 <0 5 710 MWI 12/30/93 776 2678 -1902 000 12 <0 5 19 7 7 390 -- M W 1 02/17/94 776 2647 -18 71 000 <0 5 13 <0 5 <0 5 130 -- M W I 05/10/94 776 26 12 -1836 000 <0 5 13 0 6 0 6 510 -- MWI 08/02/94 776 2759 -1983 000 <0 5 3 5 1 7 5 2 780 -- MWI 11/01/94 776 2794 -20 18 000 <0 5 <0 5 10 2 0 400 -- MWI 02/17/95 776 25 35 -1759 000 <0 5 098 1 1 1 1 480 -- M W 1 05/11/95 776 22 72 -1496 000 <0 5 <0 5 <0 5 <0 5 130 MWI 08/24/95 776 2403 -1627 000 <0 5 <0 5 <0 5 <0 5 140 MWI 10/19/95 776 2461 -1685 000 <0 5 <0 5 <0 5 <0 5 210 <2 5 MWI 02/13/96 776 2243 -1467 000 <0 5 <0 5 <0 5 <0 5 190 -- M W 1 04/18/96 776 20 04 -1228 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 MW t 08/08/96 776 2132 -1356 000 g1proiecis1739421masierlwplg0603U9426w As Pa6e 3 of 48