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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 ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MWI. 05/17/90 776 2824 -2048 000 <0 5 4 5 <0 5 <0 5 120 -- <br /> 09/25/90 2959 -21 83 000 <0 5 7 0 1 0 4 7 170 <br /> 12/19/90 Dry -- -_ _- -_ - -_ <br /> 01/30/91 Dry <br /> 05/02/91 Dry <br /> 07/16-17191 Dry <br /> 10/15/91 2995 -22 19 a 000 <br /> 01/28/92 2970 -21 94 a 000 <br /> 04/30/92 2926 -2150 000 <br /> 08/13/92 29 85 -2209 000 <br /> 10/08/92 Dry <br /> 02/23/93 28 55 -2079 000 -- -- _- -_ <br /> 05/18/93 2712 -1936 000 19 <0 5 28 1 8 950 -- <br /> 08/22/93 2734 -1958 000 89 <0 5 <0 5 <0 5 710 -- <br /> 12/30/93 2678 -1902 000 12 <0 5 1 9 7 7 390 -- <br /> 02/17/94 2647 -1871 000 <0 5 13 <0 5 <0 5 130 -- <br /> 05/10/94 2612 -1836 000 <0 5 13 0 6 0 6 510 -- <br /> 08/02/94 2759 -1983 000 <0 5 3 5 17 5 2 780 -- <br /> 11/01/94 2794 -20 18 000 <0 5 <0 5 10 2 0 400 -- <br /> 02/17/95 25 35 -1759 000 <0 5 098 1 1 1 1 480 -- <br /> 05/11/95 2272 -1496 000 <0 5 <0 5 <0 5 <0 5 130 -- <br /> 08/24/95 2403 -1627 000 <0 5 <0 5 <0 5 <0 5 140 -- <br /> 10/19/95 2461 -1685 000 <05 <05 <05 <05 210 <25 <br /> 02/13/96 2243 -1467 000 <0 5 <0 5 <0 5 <0 5 190 -- <br /> 04/18/96 2004 -1228 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 <br /> 08/08/96 2132 -13 56 000 -- -- -_ __ _- -- <br /> 11/04/96 21 77 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 <br /> t pro}ects1739421znastertiwp'gl2OOU942gwxls Page 3of43 <br />