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0 ! • TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration (pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW I 08/19/98 643 1492 -849 000 -- -- __ M W I 11/18/98 643 1534 -8 91 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W 1 03/30/99 643 -- __ MW 1 05/05/99 643 13 88 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW 1 08/20/99 643 1526 -883 000 -- -- __ M W I 12/06/99 643 1542 -899 000 MW I 02/29/00 643 -- -- MW1 05/16/00 643 1319 -676 000 -- -- MW I 09/11/00 643 1544 -901 000 <0 5 <0 5 <0 5 071 <50 <0 5 MW I 12/13/00 643 15 38 -8 95 000 <0 5 <0 5 <0 5 071 <50 <0 5 MW 1 03/08/01 643 -- __ MW 1 06/21/01 643 1586 -943 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 M W I 09/20/01 643 1693 -1050 000 -- -- __ MW 1 12/04/01 6 38 1671 -1033 000 -- -- -- MW 1 03/05/02 638 1600 -962 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 M W 1 06/)1/02 638 1649 -1011 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 -15 55 000 600 62 520 1,900 7,400 -- MW2 11/16/88 877 2447 -1570 000 840 140 650 1,600 10,000 -- MW2 02/09/89 8 77 2902 -2025 000 480 55 660 1,700 7,200 MW2 05/31/89 8 77 2569 -1692 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 MW2 05/11/95 877 24 19 -1542 000 34 41 83 1,000 5,200 - MW2 08/24/95 8 77 2280 -1403 000 80 <5 0 150 130 2,800 MW2 10/19/95 877 2599 -1722 000 24 <5 0 48 13 1,300 <25 MW2 02/13/96 877 2384 -1507 000 49 <2 5 65 17 1,300 -- MW2 04/18/96 877 2098 -1221 000 -- -_ -_ g�projects1739421Unasterlwp\gO602U942gw x1s Page 4 of 43