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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 WIL) <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 /> V1 05/02/91 857 3174 -23 17 000 20,000 49,000 4,700 25,000 130,000 -- <br /> 07/16-17191 3270 -24 13 000 14,000 44,000 3,000 15,000 170,000 -- <br /> 10/15/91 3325 -2468 000 18,000 51,000 4,200 23,000 200,000 -- <br /> 01/28/92 3151 -2294 Sheen 20,000 58,000 2,400 23,000 150,000 -- <br /> 04/30/92 31 12 -2255 000 15,000 43,000 3,000 18,000 130,000 -- <br /> 08/13/92 33 17 -2460 000 12,000 44,000 3,600 20,000 180,000 -- <br /> 10/08/92 33 76 -25 18 001 Not sampled-LPH <br /> 02/23/93 3047 -21 90 000 9,800 19,000 3,700 18,000 100,000 -- <br /> 05/18/93 -- _- __ <br /> 08/22/93 2970 -21 13 000 <br /> 12/30/93 2905 -2048 000 <br /> 02/17/94 2873 -20 16 000 -- -- __ __ __ <br /> 05/10/94 28 33 -1976 000 8,200 37,000 3,600 17,000 110,000 -- <br /> 08/02/94 -- -- __ -- -- -- -- -- -- <br /> 11/01/94 3005 -2148 000 <br /> 02/17/95 2763 -1906 000 <br /> 05/11/95 2487 -1630 000 <br /> 08/24/95 -- __ <br /> ,0119!95 Well dry <br /> 02/13/96 Well dry <br /> 04/18/96 Well dry <br /> 08/08/96 Well dry <br /> 11/04/96 Well dry <br /> 02/03/97 Well dry <br /> 05/08/97 760 Well dry <br /> 08/26/97 Well dry <br /> 11/11/97 Well dry <br /> 03/03/98 Well dry <br /> 05/20/98 Well dry <br /> 08/19/98 Well dry <br /> 11118198 Well dry __ __ __ -- <br /> J 4prOjLds%73942LnaswAA�p1g9UOU942bw AS Paye 30 of 37 <br />