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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCK-TON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(ug/L) _ <br /> Well Elevation to Water Elevation Thickness Ethyl- T <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW12 08/13/92 9 16 3682 -2766 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/08/92 3754 -2838 000 <0 5 <0 5 <0 5 <0 5 <50 <br /> 02/23/93 3445 -2529 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 05/18/93 Not Accessible -- _- __ <br /> 08/22/93 Not Accessible <br /> 12/30/93 Not Accessible <br /> 02/17/94 Not Accessible __ -- __ <br /> 05/10/94 3105 -2189 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08/02/94 3255 -2339 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/01/94 33 03 -23 87 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 02/17/95 3057 -2141 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 05/11/95 2765 -1849 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08/24/95 2851 -1935 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/19/95 2888 -1972 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 02/13/96 2665 -1749 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 04/18/96 24 12 -1496 000 -- -- __ -- <br /> 08/08/96 2493 -1577 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 11/04/96 2531 -16 15 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 02/03/97 2103 -11 87 000 -- -- -_ __ <br /> 05/08/97 875 2000 -1125 000 <br /> 08126197 2163 -12 88 000 -- -- _- -- <br /> 11/11/97 2228 -13 53 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 1705 -830 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 1623 -748 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 <2 0* <br /> 08/19/98 1759 -8 83 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> fIpiojectsW3942Vmasterlwp�gI20013942gwxls Page 21 of43 <br />