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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(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW3 11/11/97 8 54 Well dry -- -- -- -- -- __ MW3 03/03/98 854 16 16 -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 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 8 54 <2 0* MW3 08/19/98 854 1748 -894 000 59 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 0 00 -- -- -- -- -- -- MW3 02/29/00 854 1567 -713 000 -- -- -- -- -- -- MW3 05/16/00 854 1562 -708 000 MW3 09/11/00 854 1798 -944 000 73 84 5 9 115 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 18 83 90 <0 5 MW3 03/08/01 854 17 06 -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 29 MW3 06/21/01 8 54 <5* MW3 09/20/01 854 1955 -1101 000 -- -- -- -- -- - MW3 12/04/01 851 1935 -1084 000 077 <05 <05 <05 71 <5* MW3 03/05/02 851 1850 -999 000 2 60 1 00 050 160 290 h 760 MW3 03/05/02 851 <0 5* MW3 06/11/02 851 18 88 -1037 000 -- -- -- -- -- MW3 09/10/02 851 2020 -1169 000 16 2 6 18 59 246 h 6 5 MW3 09/10/02 851 <0 5* MW3 12/18/02 851 1997 -1146 000 2 8 21 16 4 7 323 h <0 5 MW3 03/24/03 851 1940 -1089 000 -- -- -- -- -- -- MW3 03/25/03 851 -- -- -- 500 18 4 0 56 755 It <0 5 MW3 06/11/03 851 1956 -1105 000 182 6 1 148 12 3 1,510 h 344 MW3 06/11/03 851 <0 5* MW3 09/17/03 851 2094 -1243 000 920 6 2 t24 16 7 1,510 h 268 MW3 09/17/03 851 <0 5* 9 1projccts\73942V=tcr\wp\g0904\3942gw xls Page 8 of 56