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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 X lenes TPH-g MTBE MWI 11/11/97 643 1915 -1272 000 M W 1 03/03/98 643 1330 -687 000 MWI 05/20/98 643 1348 -705 000 MWI 08/19/98 643 1492 -849 0 00 -- _- __ M W 1 11/18/98 643 1534 -891 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W 1 03/30/99 643 -- MWI -MW1 05/05/99 643 1388 -7 45 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MWI _ 08/20/99 643 - 1526 -8 83 000 -- -- -- MWI -MW1 12/06/99 643 1542 -8 99 000 MWI 02/29/00 643 -- _ MWI 05/16/00 643 13 19 -676 000 __ MWI 09/11/00 643 1544 -901 000 <0 5 <0 5 <0 5 071 <50 <0 5 MWI 12/13/00 643 15 38 -895 000 <0 5 <0 5 <0 5 071 <50 <0 5 M W 1 03/08/01 643 -- -- MWI 06/21/01 643 15 86 -943 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 M W 1 09/20/01 643 1693 -1050 000 __ -- MWI MWI 12/04/01 638 1671 -1033 000 -- MW I 03/05/02 638 1600 -962 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 M W i 06/11/02 638 1649 -1011 000 -- -- MWI _MW1 09/10/02 638 1750 -11 12 000 -- MWI 12/18/02 638 1726 -1088 000 __ _ MW2 01/87 877 -- -- 26 190 -- 1,100 11,000 MW2 07/16/87 877 1880 -1003 000 68 26 630 1,320 4,800 MW2 04/11/88 877 21 89 -13 12 000 94 <20 240 880 11,000 MW2 09/13/88 877 2432 -1555 000 600 62 520 1,900 7,400 -- MW2 11/16/88 877 24 47 -1570 000 840 140 650 1,600 10,000 MW2 02/09/89 877 29 02 -2025 0 00 480 55 660 1,700 7,200 '- MW2 05/31/89 877 2569 -16 92 000 680 62 800 3,100 17,000 MW2 08/17/89 877 2733 -1856 000 2,100 430 350 1,700 15,000 -- MW2 12/19/89 877 2768 -1891 000 -- -- _- MW2 877 Well dry since 03/21/90 g Ipro3ecis1739421masterlwplq 1202U942gw xls Page 4 of 45