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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- _ _Meet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 10/19/95 914 Well dry -- -- -- -- -- MW3 02/13/96 9 14 2529 -16 15 000 270 68 81 210 2,200 -- MW3 04/18/96 9 14 1940 -1026 0 00 80 9 5 25 45 1,000 17 MW3 08/08/96 9 14 2405 -1491 000 -- -- -- -- -- -- MW3 11/04/96 9 14 2405 -1491 000 -- -- -- -- -- -- MW3 02/03/97 9 14 1963 -1049 000 180 4 6 48 110 1,400 24 MW3 05/08/97 854 1942 -1088 000 -- -- -- -- -- -- MW3 08/26/97 8 54 2120 -1266 000 -- -- -- -- -- MW3 11/11/97 854 Well dry -- -- -- -- -- -- MW3 03/03/98 854 1616 -762 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/03/98 854 <2 0* MW3 05/20/98 854 16 02 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 854 <2 0* MW3 08/19/98 854 1748 -894 000 5 9 2 2 <0 5 063 280 2 6 MW3 08/19/98 854 <2 0* MW3 11/18/98 854 1793 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/30/99 854 -- -- -- -- -- -- -- -- _- MW3 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW3 08/20/99 854 1785 -931 000 -- -- -- -- -- -- MW3 12/06/99 854 1802 -948 000 -- -- -- -- -- -- MW3 02/29/00 854 1567 -7 13 000 -- -- -- -- -- -- MW3 05/16/00 854 1562 -708 000 -- -- -- -- -- -- MW3 09/11/00 854 1798 -944 000 7 3 84 5 9 115 220 <0 5 MW3 12/I3/00 854 1760 -906 000 3 4 11 18 8 3 90 <0 5 MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 MW3 06/21/01 854 1842 -988 000 <0 5 <0 5 <0 5 <0 5 160 2 9 MW3 06/21/01 854 <5* MW3 09/20/01 8 54 1955 -1101 000 -- -- -- -- -- -- MW3 12/04/01 8 51 1935 -1084 0 00 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 8 51 1850 -999 0 00 260 100 050 160 290 h 760 MW3 03/05/02 8 51 <0 5* MW3 06/11/02 851 1888 -1037 000 -- -- -- -- -- -- MW3 09/10/02 851 2020 -1169 000 16 26 1 8 5 9 246 h 6 5 g%projects1739421masterlwplq 1005\3942gw xis Page 8 of 58