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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-g MTBE MW3 08/08/96 9 14 24 05 -1491 000 -- -- -- -- -- -- MW3 11/04/96 9 14 24 05 -1491 000 -- -- -- -- MW3 02/03/97 9 14 19 63 -1049 000 180 4 6 48 110 1,400 24 MW3 05/08/97 854 1942 -1088 000 -- -- -- -- -- -- MW3 08/26/97 854 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 1602 -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 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 8 54 MW3 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW3 08/20/99 854 17 85 -931 000 -- -- -- -- -- MW3 12/06/99 854 1802 -948 000 -- -- -- -- -- -- MW3 02/29/00 854 1567 -713 000 -- -- -- -- -- MW3 05/16/00 854 1562 -708 000 -- -- -- -- __ MW3 09/11/00 854 1798 -944 000 7 3 84 59 115 220 <0 5 MW3 12/13/00 854 1760 -9 06 000 3 4 11 1 8 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 09/20/01 854 1955 -1101 000 -- -- -- -- -- MW3 12/04/01 8 51 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 851 1850 -999 000 260 100 050 160 290 h 760 MW3 03/05/02 851 <0 5* MW3 06/11/02 851 1888 -1037 000 MW3 09/10/02 851 2020 -1169 000 16 2 6 18 5 9 246 h 6 5 MW3 09/10/02 851 <0 5* MW3 12/18/02 851 1997 -1146 000 28 2 1 16 4 7 323 h <0 5 g 1prolects1739421ma5Icrlwplq 120413942gw xls Page 9 of 59