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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 EIevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MWI 12/19/89 776 2922 -2146 000 <0 5 1 9 <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 7 76 2824 -2048 000 <0 5 45 <0 5 <0 5 120 MWI 09/25/90 776 2959 -21 83 000 <0 5 7 0 10 4 7 170 - MWI 12/19/90 776 Dry -- __ -- MWI 01/30/91 7 76 Dry M W 1 05/02/91 776 Dry M W 1 07/16-17/91 776 - Dry MWI 10/15/91 7 76 2995 -22 19 a 000 MWI 01/28/92 776 2970 -2194 a 000 MWI 04/30/92 776 2926 -21 50 000 M W 1 08/13/92 776 2985 -2209 0 00 MWI 10/08/92 776 Dry M W 1 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 MWI 02/17/94 776 2647 -1871 000 <0 5 1 3 <0 5 <0 5 130 MWI 05/10/94 776 26 12 -1836 000 <0 5 13 0 6 0 6 510 MWI 08/02/94 776 2759 -19 83 000 <0 5 3 5 1 7 5 2 780 MWI 11/01/94 776 2794 -2018 000 <0 5 <0 5 1 0 2 0 400 MWI 02/17/95 776 2535 -1759 000 <0 5 098 1 1 1 1 480 MWI 05/11/95 776 2272 -1496 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 56 000 -- -- __ MWI 11/04/96 776 2177 -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 MWI 05/08/97 643 16 80 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 08/26/97 643 1858 -12 15 000 -- -- blprojeces\739421mes1crlwplg120213942gw As Page 3 of45