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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- Numbei Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MWI 05/31/89 776 2926 -21 50 000 <0 5 <0 5 <0 5 08 <250 MWI 08/17/89 776 2587 -1811 000 <0 5 <0 5 <0 5 <0 5 <250 - MWI 12/19/89 776 2922 -2146 000 <0 5 19 <0 5 <0 5 <250 M W I 03/21/90 776 2746 -1970 000 <0 5 <0 5 0 8 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 7 76 Dry __ -- MWI _MWI 01/30/91 776 Dry MWI 05/02/91 776 Dry -- M W 1 07/16-17/91 776 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 -21 50 000 MWI 08/13/92 776 29 85 -22 09 000 -- - M W i 10/08/92 776 DryMWI 02/23/93 7 76 2855 -2079 000 - MW 1 05/18/93 776 27 12 -1936 000 19 <0 5 2 8 1 8 950 MWI 08/22/93 776 2734 -1958 000 8 9 <0 5 <0 5 <0 5 710 M W I 12/30/93 776 2678 -1902 000 1 2 <0 5 19 7 7 390 MWI 02/17/94 776 2647 -18 71 0 00 <0 5 1 3 <0 5 <0 5 130 '- MWI 05/10/94 7 76 26 12 -1836 000 <0 5 1 3 0 6 0 6 510 ' MWI 08/02/94 776 2759 -1983 000 <0 5 3 5 17 5 2 780 MWI 11/01/94 776 2794 -20 18 000 <0 5 <0 5 1 0 2 0 400 MWI 02/17/95 776 25 35 -1759 000 <0 5 098 1 1 1 1 480 MWI 05/11/95 776 2272 -14 96 000 <0 5 <0 5 <0 5 <0 5 130 M W 1 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 -- MWI 04/18/96 776 2004 -1228 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 MWI 08/08/96 776 2132 -13 56 0 00 MWI 11/04/96 776 21 77 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 MWI 02/03/97 776 1700 -924 000 <0 5 <0 5 <0 5 <0 5 82b <2 5 1,1pro3ects\739421ntasterl"p1g030313942gw x1s Pa6e 3 of 47