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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 msI) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> UVB-MWI 05/16/00 742 1473 -731 000 14,000 31,000 4,000 27,100 160,000 <250 <br /> 09/11/00 17 11 -969 000 12,000 22,000 3,800 18,300 130,000 <120 <br /> 12/13/00 17.05 -9.63 000 13,000 28,000 4,100 21,400 130,000 <120 <br /> UVB-MW2 02/28/97 7 75 1796 -- 000 200 1,100 190 1,700 9,400 <2 5 <br /> 05/08/97 1994 -12 19 000 092 <0 5 <0 5 1 7 58 3 0 <br /> 08/26/97 d 20 87 -13 12 000 12,000 23,000 2,700 13,000 120,000 1,300 <br /> 10/02/97 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 11/11/97 2143 -13 68 000 <0 5 099 066 41 <50 <2 5 <br /> 03/03/98 1595 -820 000 2,200 190 <20 1,300 12,000 <100 <br /> 03/03/98 <20* <br /> 05/20/98 15 82 -807 000 2,500 180 950 1,300 16,000 560 <br /> 05/20/98 <14* <br /> 08/19/98 1703 -928 000 14 4 8 2 7 24 250 16 <br /> 08/19/98 <2 0* <br /> 11/18/98 1753 -978 000 230 8 0 25 23 760 <25 <br /> 03/30/99 1663 -8 88 000 805 761 366 240 6,290 <20 <br /> 05/05/99 16 12 -837 000 693 366 457 225 5,510 35 8 <br /> 08/20/99 1753 -978 000 730 759 120 25 2 2,430 104 <br /> 12/06/99 1768 -9 93 000 23 <1 <1 <1 600 9 4 <br /> 02/29/00 1533 -758 000 27 12 5 7 5 2 320 <1 <br /> 05/16/00 1508 -733 000 87 14 2 8 4 680 7 5 <br /> 09/11/00 1755 -9 80 000 330 7 1 29 27 2,100 <2 5 <br /> 12/13/00 17.41 -9 66 000 120 180 19 124 1,800 <2 5 <br /> a Water in well may be residual water to end cap <br /> b Unidentified hydrocarbons present <br /> f 1projet ts1739421niasterlwply 120013942gw As Page 42 of 43 <br />