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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 /L Well Elevation to Water Elevation Thickness EthyI- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-& MTBE 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 18 02 -948 0 00 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 8 4 5 9 115 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 1 8 83 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 12/04/01 851 1935 -1084 000 077 <05 <05 <05 71 <5* MW3 03/05/02 8 51 1850 -999 000 260 100 050 160 290 h 7 60 MW3 03/05/02 851 <0 5* MW3 06/11/02 8 51 1888 -1037 000 -- -- MW3 09/10/02 8 51 2020 -1169 000 16 2 6 1 8 5 9 246 h 6 5 MW3 09/10/02 851 <0 5* MW3 12/18/02 851 1997 -1146 000 28 21 16 4 7 323 h <0 5 MW3 03/24/03 851 1940 -1089 000 -- __ MW3 03/25/03 8 51 -- -- -- 500 18 4 0 5 6 755 h <0 5 MW3 06/11/03 851 1956 -1105 000 182 61 14 8 123 1,510 h 344 MW3 06/11/03 851 <0 5* MW3 09/17/03 8 51 2094 42 43 000 920 6 2 124 167 1,510 h 268 MW3 09/17/03 851 <0 5* MW3 12/08/03 8 51 2094 -1243 000 570 6 1 9 0 11 1 1,270 h 163 MW3 12/08/03 851 <0 5* MW3 03/02/04 851 1945 -1094 000 680 44 104 97 940 h 224 MW3 03/02/04 851 <0 5* MW3 06/28/04 851 2061 -1210 0 00 -- — _ _ _ g�projects1739421maskrlwp%gO7O413942gw xls Page 8 of 54 I