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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 Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE IW 1 11/18/98 690 1602 -9 12 000 16 <5 0 78 40 1,300 26 MI. 03/30/99 690 W 1 05/05/99 690 1452 -762 000 1 56 <1 0 148 725 2,170 106 I W I 08/20/99 6 90 1600 -910 000 -- -- -- _- 1W I 12/06/99 690 1622 -932 000 <1 <1 19 8 5 420 19 IW 1 02/29/00 690 1373 -683 000 <1 <1 <1 <l 68 <1 I W 1 05/16/00 690 1382 -692 000 7 6 <1 1 6 <1 490 2 4 i IW1 09/11/00 690 1615 -925 000 051 <05 096 <05 590 <05 W I 12/13/00 690 1600 -910 000 <0 5 <0 5 <0 5 192 690 <0 5 1 W I 03/08/01 6 90 15 13 -823 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 l W 1 06/21/01 6 90 1651 -961 000 <0 5 <0 5 15 0 6 800 57 IW I 06/21/01 690 <5* IW I 09/20/01 690 1761 -1071 000 6 9 <2 5 <2 5 <2 5 <250 <2 5 MI. 12/04/01 6 87 1737 -1050 000 3 <0 5 13 <0 5 310 <5* W 1 03/05/02 6 87 1653 -966 000 10 8 070 12 6 130 895 h 121 IW 1 03/05/02 687 <5 0* 1 W I 06/11/02 6 87 1708 -1021 000 11 1 <0 5 10 7 13 704 h 8 5 IW i 06/11/02 6 87 <0 5* I W 1 09/10/02 687 1822 -1135 000 9 8 <0 5 8 5 1 1 738 h 101 W I 09/10/02 6 87 <0 5* W l 12/18102 6 87 1794 -1107 000 115 0 8 8 1 1 2 747 h <0 5 MI. 03/24/03 6 87 1740 -1053 000 10 0 <0 5 7 8 <0 5 859 h 6 6 IW I 03/24/03 6 87 <0 5* IWI 06/11/03 687 1757 -1070 000 182 08 90 13 1,140 h 122 IW I 06/11/03 6 87 <0 5* I W 1 09117 6.87 1892 -1205 000 207 0 5 7 3 17 1,340 h 107 I W 1 09/17/03 6 87 <0 5* MW I 01/87 776 -- -- <1 <1 -- <1 <50 -- M W I 07/16/87 776 -- -- -- <0 5 15 <0 5 <0 50 <100 -- M W 1 04/11/88 776 2051 -1275 0 00 <0 5 <0 5 <0 5 <0 5 <100 MW 1 09113/88 776 22 18 -1442 000 19 2 5 <0 5 <0 5 70 -- M W I 11/16/88 776 2307 -15 31 000 <0 5 9 5 <0 5 <0 5 130 MW l 02/09/89 776 2264 -14 88 000 17 0 2 0 2 0 6 <250 -- g 1ptuJuts1739421masiuhvp1gG903U942gu xEs Page 2 of 47