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• • i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg1L) 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 2,170 106 IWI 08/20/99 690 1600 -9 l0 000 -- -- -- -- -- -- IWI 12/06/99 690 1622 -932 000 <1 <1 19 85 420 19 1w] 02/29/00 690 1373 -683 000 <1 <1 <1 <1 68 <1 IWI 05/16/00 690 1382 -692 000 76 <1 16 <1 490 24 IWI 09/11/00 690 16 15 -925 000 051 <0 5 096 <0 5 590 <0 5 IWI 12/13/00 690 1600 -9 10 000 <0 5 <0 5 <0 5 192 690 <0 5 IW 1 03/08/01 690 15 13 -823 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 IWI 06/21/01 690 1651 -961 000 <0 5 <0 5 15 06 800 5 7 IWI 06/21/01 690 <5* IW 1 09/20/01 690 1761 -1071 000 69 <2 5 <2 5 <2 5 <250 <2 5 IWI 12/04/01 687 1737 -1050 000 3 <05 13 <05 310 <5* IWI 03/05/02 687 1653 -966 000 108 070 126 130 895 h 121 IWI 03/05/02 687 <5 0* IW1 06/11/02 687 1708 -1021 000 11 1 <0 5 107 13 704 h 85 IWI 06/11/02 687 <0 5* IWI 09/10/02 687 1822 -1135 000 98 <0 5 85 1 1 738 h 101 IW 1 09/10/02 687 <0 5* IWI 12/18/02 687 1794 -1107 000 115 08 8 1 12 747 h <0 5 IW1 03/24/03 687 1740 -1053 000 100 <05 78 <05 859 h 66 IWI 03/24/03 687 <0 5* IWI 06/11/03 687 1757 -1070 000 182 08 90 13 1,140 h 122 IWI 06/11/03 687 <0 5* IWI 09/17/03 687 1892 -1205 000 207 05 73 17 1,340 h 107 IWI 09/17/03 687 <0 5* IWI 12/08/03 687 1894 -1207 000 140 17 54 07 1,450 h 40 IWI 12/08/03 687 <0 5* IWI 03102104 687 1742 -1055 000 106 <05 37 <05 514 h 74 IWI 03/02/04 687 <0 5* IWI 06/28/04 687 t8 59 -1172 000 -- -- -- -- -- -- g 1prolec4s1739425mastu0wplq 120513942gw As Page 2 of 59