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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW 1 02/03/97 776 1700 -924 000 <0 5 <0 5 <0 5 <0 5 82b <2 5 <br /> 05/08/97 643 1680 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/26/97 18 58 -12 15 000 -- -- -_ __ <br /> 11/11/97 19 15 -1272 000 <br /> 03/03/98 13 30 -687 000 <br /> 05/20/98 1348 -705 000 <br /> 08/19/98 1492 -849 000 -- __ __ __ __ <br /> 11/18/98 1534 -891 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 -- -- -- -- -- -- -- -- -- <br /> 05/05/99 13 88 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 1526 -8 83 000 -- -- __ __ __ <br /> 12/06/99 1542 -899 000 <br /> 02/29/00 -- __ -- <br /> 05/16/00 13 19 -676 000 -- -- __ __ __ -- <br /> 09/11/00 1544 -901 000 <05 <05 <05 071 <50 <05 <br /> 12/13/00 1538 -895 000 <0 5 <0 5 <0 5 071 <50 <0 5 <br /> MW2 01/87 8 77 -- -- -- 26 190 -- 1,100 11,000 -- <br /> 07/16/87 1880 -1003 000 68 26 630 1,320 4,800 -- <br /> 04/11/88 2189 -13 12 000 94 <20 240 880 11,000 -- <br /> 09/13/88 2432 -1555 000 600 62 520 1,900 7,400 -- <br /> 11/16/88 2447 -1570 000 840 140 650 1,600 10,000 -- <br /> 02/09/89 2902 -20 25 000 480 55 660 1,700 7,200 -- <br /> 05/31/89 25 69 -1692 000 680 62 800 3,100 17,000 -- <br /> 08/17/89 2733 -1856 000 2,100 430 350 1,700 15,000 -- <br /> 12/19/89 2768 -1891 000 -- -- -_ -- __ <br /> Well dry since 03/21/90 <br /> 05/11/95 24 19 -1542 000 34 41 83 1,000 5,200 -- <br /> t�ptgjcctsW3942Vmasterlwplq I200L3942gw xls Page 4 of 43 <br />