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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 /> P 1 02/23/93 779 2882 -2103 000 66 18 200 200 2,300 -- <br /> 05/18/93 2746 -1967 000 43 18 290 220 3,200 -- <br /> 08/22/93 2772 -1993 000 44 6 9 160 130 1,900 -- <br /> 12/30/93 2707 -1928 000 210 52 840 770 7,800 <br /> 02/17/94 2675 -1896 000 57 29 250 190 2,300 -- <br /> 05/10/94 2641 -1862 000 120 60 450 370 4,800 -- <br /> 08/02/94 27 87 -2008 000 100 16 310 200 3,200 -- <br /> 11/01/94 2820 -2041 000 52 <0 5 160 120 1,700 -- <br /> 02/17/95 25 52 -1773 000 80 5 8 300 180 4,000 -- <br /> 05/11/95 22 95 -15 16 000 55 <5 0 160 110 2,400 -- <br /> 08/24/95 2431 -1652 000 <5 0 80 350 230 2,900 -- <br /> 10/19/95 2478 -1699 000 84 9 7 250 180 2,700 <25 <br /> 02/13/96 2252 -14 73 000 84 <5 0 230 70 3,300 -- <br /> 04/18/96 2070 -1291 000 -- -- __ <br /> 08/08/96 2141 -13 62 000 -- -- -_ __ -_ <br /> 11/04/96 2205 -1426 000 67 <5 0 170 21 2,000 <25 <br /> 02/03/97 1750 -9 71 000 -- -- __ -_ __ <br /> 05/08/97 643 17 14 -1071 000 41 2 9 120 48 1,500 7 1 <br /> 08/26/97 1882 -1239 000 -- -- __ __ __ -- <br /> 11/11/97 1936 -1293 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 1341 -698 000 20 1 1 91 28 940 13 <br /> 03/03/98 3 7* <br /> 05/20/98 13 75 -732 000 20 <5 0 110 19 1,600 <25 <br /> 05/20/98 3 1* <br /> 08/19/98 1521 -878 000 16 2 5 17 13 250 3 0 <br /> 09/19/98 <2 0* <br /> 11/18/98 1561 -9 18 000 -- -_ __ _- __ <br /> 1�grojectsQ39421masterlwplq 120OU942gw xls Page 24 of 43 <br />