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■w w w■� w w w w : w w w ■� ■w w w � I 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- Numbei Date (feet) (feet) (feet)_- (feet) Benzene Toluene benzene Xylenes - TPH-g MTBE MWI 08/20/99 643 15 26 -883 000 MWI 12/06/99 643 1542 -899 000 MW l 02/29/00 643 MWI 05/16/00 643 1319 -676 000 -- -- -- -- __ -- MWI 09/11/00 643 1544 -901 000 <05 <05 <05 071 <50 <05 MWI 12/13/00 643 1538 -895 000 <05 <05 <05 071 <50 <05 MWI 03/08/01 643 -- -- -- -- -- -_ _- -- MWI 06/21/01 643 1586 -943 000 <05 <05 <05 <05 <50 <05 MWI 09/20/01 643 1693 -1050 000 -- -- __ -_ -- -- AM W 1 12/04/01 638 1671 -1033 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 2189 -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 2447 -1570 000 840 140 650 1,600 10,000 -- MW2 02/09/89 877 2902 -2025 000 480 55 660 1,700 7,200 -- MW2 05/31/89 877 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 08/24/95 877 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 23 84 -1507 000 49 <2 5 65 17 1,300 -- MW2 04/18/96 877 2098 -1221 000 -- -- -- -- _- _- MW2 08/08/96 877 2275 -1398 000 19 <0 5 41 11 490 68 MW2 11/04/96 8 77 2277 -1400 000 25 <0 5 65 14 810 21 MW2 02/03/97 877 1861 -984 000 -- -- -- -- __ t __ MW2 05/08/97 749 1825 -1076 000 12 <0 5 1 1 <0 5 73 <2 5 MW2 08/26/97 749 20 03 -1254 000 -- -- -- -- -- -- MW2 1IJI1/97 749 2056 -1307 000 32 <05 34 071 160 52 o%Pioleu5',739 2?il)JS[LrlHPlq 120113932gw x1s Purge 4 of 40