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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 /> VI 02/03/97 857 Well dry <br /> 05/08/97 7 60 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 /> 11/18/98 Well dry -- -- -- -- -- _- <br /> 03/30/99 -- -- -- -- -- -- _- <br /> 05/05/99 Well dry -- -- -- -- -- __ <br /> 08/20/99 Well dry <br /> 12/06/99 -- -- -- -- -- -- -- -- <br /> 02/29/00 <br /> 05/16/00 -- -- -- -- -- -- -- -- <br /> 09/11/00 -- -- __ -- -_ -- -- -_ -- <br /> 12/13/00 17.05 -945 000 83 170 24 128 970 <0.5 <br /> I <br /> V2 05/02/91 930 3262 -2332 000 -- -- __ -- <br /> 07116-17191 33 57 -2427 000 -- -- __ __ <br /> 10/15/91 3408 -2478 000 27,000 43,000 4,300 22,000 190,000 -- <br /> 01/28/92 3238 -2308 000 27,000 42,000 5,100 25,000 150,000 -- <br /> 04/30/92 3203 -2273 000 27,000 37,000 3,700 17,000 140,000 -- <br /> 08/13/92 3399 -2469 000 28,000 49,000 5,600 28,000 220,000 -- <br /> 10/08/92 3457 -2526 002 Not sampled - LPH <br /> 02/23/93 3137 -2207 000 -- __ __ -- -_ <br /> 05/18/93 -- -- __ -- -- -- -- -- <br /> 08/22/93 30 16 -20 86 000 27,000 46,000 3,500 17,000 180,000 -- <br /> t%projects1739421maslcAwplgI2000942gw xls Page 36 of 43 <br />