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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 ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW 10 05/08/97 729 1928 -1199 000 40 51 64 110 1,300 38 <br /> 08/26/97 2111 -13 82 000 21 14 3 7 <0 5 63 <2 5 <br /> 11/11/97 2162 -1433 000 1 8 060 0 <br /> 84 <0 5 <50 3 1 <br /> 03/03/98 1630 -901 000 360 7,800 1,300 5,000 23,000 940 <br /> 03/03/98 <br /> <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 <05 <05 <05 <05 <50 <25 <br /> 03/30/99 1554 -825 000 -- -- _- <br /> 05/05/99 15 84 -855 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 -- -- <br /> 12/06/99 1766 -1037 000 -- -- -- __ <br /> 02/29/00 1534 -805 000 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 1542 -8 13 000 -- -- -- __ <br /> 09/11/00 1743 -10 14 000 0 8 2 <0 5 1 97 50 <0 5 <br /> 12/13/00 17.29 -10.00 0.00 <0.5 <0.5 <0 5 <0 5 62 <0 5 <br /> MW 11 05/02/91 1015 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- <br /> 07/16-17191 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/15/91 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 01/28/92 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 04/30/92 3772 -2757 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08/13/92 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/08/92 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 02/23/93 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> t 1proiccis1739421m4sichkuplq 12000942gtiv xis Page 19 of 43 <br />