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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(E�/L)__ Well Elevation to Water Elevation Thickness Ethyl Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE UVB-MW1 12/08/03 740 <5* UVB-MW1 03/02/04 740 1869 -1129 000 6,500 11,900 2,130 11,500 80,300 h <50* UVB-MWI 06/28/04 740 1992 -1252 000 -- -- -- -- -- -- UVB-MW1 06/29/04 740 -- -- -- 10,300 17,400 3,630 17,100 121,000 h <0 5 UVB-MWI 09/27/04 740 2087 -1347 000 -- -- -- -- -- -- UVB-MW I 09/28/04 740 -- -- -- 8,500 18,000 4,460 22,000 131,000 h <0 5 UVB-MWI 12/01/04 740 2050 -1310 000 - - - -- - -- UVB-MWI 12/02/04 740 - -- -- 5,020 8,790 1,240 6,890 63,300 h <50 UVB-MW2 02/28/97 775 1796 -- 000 200 1,100 190 1,700 9,400 <2 5 UVB-MW2 05/08/97 775 1994 -12 19 000 092 <0 5 <0 5 17 58 3 0 UVB-MW2 d 08/26/97 775 2087 -13 12 000 12,000 23,000 2,700 13,000 120,000 1,300 UVB-MW2 10/02/97 775 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 UVB-MW2 11/11/97 775 2143 -1368 000 <0 5 099 066 4 1 <50 <2 5 UVB-MW2 03/03/98 775 1595 -820 000 2,200 190 <20 1,300 12,000 <100 UVB-MW2 03/03/98 775 <20* UVB-MW2 05/20/98 775 1582 -807 000 2,500 180 950 1,300 16,000 560 UVB-MW2 05/20/98 7 75 <14* UVB-MW2 08/19/98 775 1703 -928 000 14 48 2 7 24 250 16 UVB-MW2 08/19/98 7 75 <2 0* UVB-MW2 11/18/98 775 1753 -978 000 230 80 25 23 760 <25 UVB-MW2 03/30/99 775 1663 -888 000 805 761 366 240 6,290 <20 UVB-MW2 05/05/99 775 1612 -837 000 693 366 457 225 5,510 358 UVB-MW2 08/20/99 775 1753 -978 000 730 7 59 120 25 2 2,430 104 UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 94 UVB-MW2 02/29/00 775 1533 -758 000 27 12 5 7 5 2 320 <1 UVB-MW2 05/16/00 775 1508 -733 000 87 14 2 8 4 680 7 5 UVB-MW2 09/11/00 775 17 55 -980 000 330 71 29 27 2,100 <2 5 UVB-MW2 12/13/00 775 1741 -966 000 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 UVB-MW2 06/21/01 775 1793 -10 18 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* g lprojects173942Unastelwplyl2O413942gw xts Page 46 of 58