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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(ug/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet MSI) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW 10 02/17/95 861 2929 -2068 000 1,300 4,400 780 2,500 21,000 -- <br /> 05/11/95 2646 -1785 000 360 750 230 480 6,300 -- <br /> 08/24/95 2758 -1897 000 150 1,100 190 590 3,100 -- <br /> 10/19/95 2793 -1932 000 5 5 1 1 8 2 1 1 300 21 <br /> 02/13/96 25 67 -1706 000 1,600 15,000 1,400 6,500 64,000 -- <br /> 04/18/96 2320 -1459 000 1,100 8,900 1,100 4,400 42,000 <500 <br /> 08/08/96 2427 -1566 000 58 340 61 230 1,500 <50 <br /> 11/04/96 2451 -1590 000 140 3,400 410 1,600 15,000 <250 <br /> 02/03/97 2024 -1163 000 1,500 18,000 2,100 9,500 66,000 1,800 <br /> 05/08/97 729 1928 -1199 000 40 51 64 110 1,300 38 <br /> 08/26/97 21 It -13 82 000 2 1 14 3 7 <0 5 63 <2 5 <br /> 11/11/97 2162 -1433 000 18 060 0 84 <0 5 <50 3 1 <br /> 03/03/98 1630 -9 01 000 360 7,800 1,300 5,000 23,000 940 <br /> 03/03/98 <200* <br /> 05/20/98 15 62 -833 000 8 1 85 11 100 630 <5 0 <br /> 05/20/98 <br /> <2 0* <br /> 08/19/98 1706 -977 000 077 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/19/98 <2 0* <br /> 11/18/98 1747 -1018 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 1554 -825 000 -- __ -_ <br /> 05/05/99 15 84 -8 55 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 -_ -- <br /> 12/06/99 1766 -1037 ON -- -- -_ <br /> 02/29/00 1534 -8 05 000 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 1542 -8 13 000 -- -- <br /> 09/11/00 1743 -1014 000 0 8 2 <0 5 1 97 50 <0 5 <br /> MW 11 05/02/91 10 15 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- <br /> 07/16-17/91 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/15/91 39 94 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 01/28/92 3808 -2793 000 <0 5 <0 5 <05 <0 5 50< <br /> 11pnjects173942.iiiasterlwp1g9OOU9426w Us Pabe 16 of37 <br />