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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 msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> V4 08/13/92 9 38 3360 -24 17 007 Not sampled- LPH <br /> 10/08/92 3420 -24 73 0 12 Not sampled -LPH <br /> 02/23/93 30 85 -2147 000 15,000 35,000 4,300 23,000 150,000 -- <br /> 05/18/93 2935 -1997 000 13,000 47,000 5,900 28,000 240,000 -- <br /> 08/22/93 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 -- <br /> 12/30/93 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 -- <br /> 02/17/94 28 89 -1951 000 -- -- -- -- -- <br /> 05/10/94 2854 -1916 002 Not sampled -LPH <br /> 08/02/94 2993 -2055 002 Not sampled-LPH <br /> 11/01/94 3034 -20 96 000 <br /> 02/17/95 27 82 -1844 000 -- -- -- -- -- -- <br /> 05/11/95 25 12 -15 74 Sheen -- -- -- -- -- -- <br /> 08/24/95 -- -- -- <br /> 10/19/95 2685 -1747 Sheen -- -- -- -- -- <br /> 02/13/96 2474 -15 36 Sheen -- -- -- -- -- -- <br /> 04/18/96 2236 -12 98 Sheen -- -- -- -- -- -- <br /> 08/08/96 23 60 -1422 Sheen -- -- -- -- -- -- <br /> 11/04/96 2402 -14 64 000 3,200 24,000 2,900 16,000 120,000 <1,250 <br /> 02/03/97 1940 -1002 Sheen -- -- -- __ __ -- <br /> 05/08/97 822 1926 -1104 Sheen -- -- -- -- -- -- <br /> 08/26/97 2080 -1247 0 15 <br /> 11/11/97 2134 -1312 Sheen -- -- -- -- -- <br /> 03/03/98 1567 -744 001 -- -- -- -- -- -- <br /> 05/20/98 1562 -7 35 007 -- -- -- -- -- -- <br /> 08/19/98 1719 -887 0 13 -- -- -- -- -- <br /> 11/18/98 17 53 -9 24 009 -- -- -- -- -- -- <br /> 03/30/99 -- -- -- -- <br /> f\projecis1739421maste6%;plq I2000942gw xis Page 40 of 43 <br />