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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 TPI -g MTBE IWI 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 IWI 08/19/98 690 1W1 11/18/98 690 1602 <40* -9 12 0 00 16 <5 0 78 40 1,300 26 IWI 03/30/99 690 -_ lW i 05/05/99 6 90 1452 -762 000 1 56 <1 0 148 725 2,170 106 IWI 08/20/99 690 16 00 -910 000 IWI 12/06/99 690 1622 -932 000 <1 <1 -- i W l 19 8 5 420 1 9 02/29/00 6 90 13 73 -683 IWI 05/16/00 6 90 13 82 -692 0 00 000 76 <1 1 6 <1 490 24 IWI 09/11/00 690 16 15 -925 0 00 051 <0 5 096 <0 5 590 <0 5 IWI 12/13/00 690 1600 -9 10 000 <0 5 <0 5 <0 5 1 92 690 <0 5 IWI 03/08/01 6 90 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 1 5 0 6 IWI 06/21/01 690 800 5 7 IWI 09/20/01 690 <5* 1761 -1071 000 69 <25 <25 <25 <250 <25 IWI 12/04/01 6 87 1737 -1050 000 3 <0 5 13 <0 5 1W l 03/05/02 6 87 1653 310 <5* -9 66 0 00 108 070 12 6 1 30 895 h 12 1 IWI 03/05/02 6 87 JW1 06/11/02 687 1708 -1021 000 111 <05 107 13 704 h g0 * I W 1 06/11/02 6 87 IW 1 09/10/02 6 87 1822 -1135 000 9 8 <0 5 8 5 <0 5* IWI 09/10/02 687 1 1 738 1} I0 1 IWl 12/18/02 687 1794 <05* -11 07 0 00 11 5 0 8 8 1 12 747 h <0 5 1W1 03/24/03 6 87 1740 -1053 000 100 <0 5 7 8 <0 5 859 h 6 6 1 W 1 03/24/03 687 <0 5* M W 1 01/87 7 76 -- -- _ <1 <1 <1 <50 MW1 07/16/87 776 __ _ `- _- M W] 04/11/88 7 7b - -- <0 5 l 5 <0 5 <0 SO <100 20 51 -12 75 000 <0 5 <0 5 <0 5 <0 5 <100 MW1 _ 09/13/88 776 22 18 -14 42 0 00 19 2 5 <0 5 <0 5 70 MWI 11/16/88 776 2307 -1531-1531 000 <05 95 <05 <05 130 MWI 02/09/89 776 2264 -1488 000 17 02 02 0 6 <250 -- g 1pro)ects1739421ntasterlwplgO3O3U942gw%Is Page 2 of 47