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i i • TABLE 1 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 IWI 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 IW 1 08/19/98 690 <4 0* IWI 11/18/98 690 1602 -9 12 000 16 <5 0 78 40 1,300 26 IW 1 03/30/99 690 -- -- -- -- -_ -- __ IW 1 05/05/99 690 1452 -762 000 156 <1 0 148 725 2,170 10 6 I W 1 08/20/99 690 1600 -9 10 000 -- -- -- -- __ -- IWI 12/06/99 690 1622 -932 000 <1 <1 19 8 5 420 1 9 1 W 1 02/29/00 690 13 73 -6 83 000 <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 IW 1 12/13/00 6 90 1600 -910 000 <0 5 <0 5 <0 5 192 690 <0 5 IWI 03/08/01 690 1513 -823 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 IWI 06/21/01 690 1651 -9 61 000 <0 5 <0 5 1 5 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 IWI 12/04/01 687 1737 -1050 000 3 <05 13 <05 310 <5* IWI 03/05/02 6 87 1653 -966 000 108 070 12 6 1 30 895 h 12 1 Mi. 03/05/02 687 <5 0* IWI 06/11/02 687 1708 -1021 000 11 1 <0 5 107 1 3 704 h 8 5 IWI 06/11/02 6 87 <0 5* 1W1 09/10/02 687 1822 -1135 0 00 9 8 <0 5 8 5 1 1 738 h 101 IWI 09/10/02 6 87 <0 5* IWI 12/18/02 687 1794 -1107 0 00 115 0 8 8 1 12 747 h <0 5 MW1 01/87 776 -- -- -- <1 <1 -- <1 <50 -- MW 1 07/16/87 776 -- -- -- <0 5 15 <0 5 <0 50 <100 -- MW I 04/11/88 776 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 -- MWl 09/13/88 776 22 18 -1442 000 19 2 5 <0 5 <0 5 70 -- MW I 11/16/88 776 2307 -1531 000 <0 5 9 5 <0 5 <0 5 130 -- MW I 02/09/89 776 2264 -1488 000 17 0 2 0 2 0 6 <250 -- MWI 05/31/89 776 2926 -2150 000 <0 5 <0 5 <0 5 0 8 <250 -- MW I 08/17/89 776 25 87 -18 11 000 <0 5 <0 5 <0 5 <0 5 <250 -- G 1ProjCcts1739421MASTERIWPIWP030313942gw xls Page 2 of 45