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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(t g/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE IWI 08/19/98 690 <4 0* IWI 11/18/98 690 1602 -9 12 000 16 <5 0 78 40 1,300 26 IWI 03/30/99 690 -- -- -- -- -- -- -- -- -- IWI 05/05/99 690 1452 -762 000 156 <1 0 148 725 2,170 10 6 IW 1 08/20/99 690 1600 -910 000 -- -- -- -- -- -- IWI 12/06/99 690 1622 -932 000 <1 <1 19 85 420 19 IWI 02/29/00 690 13 73 -683 000 <1 <1 <1 <1 68 <1 IWI 05/16/00 690 13 82 -692 000 7 6 <1 16 <1 490 2 4 IWI 09/11/00 690 16 15 -925 000 051 <0 5 096 <0 5 590 <0 5 IWI 12/13/00 690 1600 -910 000 <0 5 <0 5 <0 5 192 690 <0 5 IWI 03/08/01 690 15 13 -823 0 00 <0 5 <0 5 <0 5 <0 5 <50 <0 5 IWI 06/21/01 690 1651 -961 000 <0 5 <0 5 15 0 6 800 5 7 IWI 06/21/01 690 <5* IWI 09/20/01 690 1761 -1071 000 6 9 <2 5 <2 5 <2 5 <250 <2 5 IW1 12/04/01 687 1737 -1050 000 3 <05 l3 <05 310 <5* IWI 03/05/02 687 1653 -9 66 000 108 070 12 6 130 895 h 12 1 IWI 03/05/02 6 87 <5 0* IW 1 06/11/02 6 87 1708 -1021 000 11 1 <0 5 10 7 13 704 h 8 5 IW 1 06/11/02 687 <0 5* IWI 09/10/02 687 1822 -1135 0 00 98 <0 5 85 1 1 738 h 101 IWI 09/10/02 6 87 <0 5* IWI 12/18/02 6 87 1794 -1107 000 115 0 8 8 1 12 747 h <0 5 IWI 03/24/03 6 87 1740 -1053 000 100 <0 5 7 8 <0 5 859 h 6 6 IWI 03/24/03 687 <0 5* IWI 06/1I/03 6 87 1757 -1070 000 18 2 0 8 9 0 13 1,140 h 12 2 IWI 06/11/03 6 87 <0 5* IWI 09/17/03 6 87 1892 -1205 000 207 0 5 73 1 7 1,340 h 107 IWI 09/17/03 6 87 <0 5* IWI 12/08/03 6 87 1894 -1207 000 140 17 5 4 0 7 1,450 h 4 0 IWI 12/08/03 6 87 <0 5* 1W 03/02/04 687 1742 -1055 000 106 <05 37 <05 514 h 74 1W 1 03/02/04 6 87 <0 5* IWI 06/28/04 687 1859 -1172 000 -- -- -- -- -- -- 1 g lprojects173942UmasteAwp\gO6G513942gw xls Page 2 of 59