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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number ___ _ Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH:$ MTBE UVB-MW 1 03/24/05 740 1863 -1123 000 9,160 24,300 3,330 17,000 143,000 h 395 UVB-MW 1 03/24/05 740 <10* UVB-MW1 06/22/05 740 1862 -1122 000 -- -- -- -- -- -- UVB-MW1 06/23/05 740 -- -- 11,400 26,800 4,010 21,600 143,000 h 180 UVB-MW 1 06/23/05 740 <200* UVB-MW1 10/12/05 740 2031 -12.91 000 -- - -- -- -- - UVB-MWl 10/13/05 740 - -- - 12,000 30,000 4,400 22,000 140,000 h <2,500 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 30 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 41 <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 05/20/98 775 <14* UVB-MW2 08/19/98 775 1703 -928 000 14 48 27 24 250 16 UVB-MW2 08/19/98 775 <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 -978 000 730 759 120 252 2,430 104 UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 94 UVB-MW2 02/29/00 775 15 33 -758 000 27 12 57 52 320 <1 UVB-MW2 05/16/00 775 1508 -7 33 000 87 14 28 4 680 75 UVB-MW2 09/11/00 775 1755 -980 000 330 7 1 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 44 UVB-MW2 06/21/01 775 1793 -10 18 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 19 13 -1138 000 24 36 13 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* g 1projects1739421mas1erlwptig100513942gw xis Page 45 of 58