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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 TPH-g MTBE I NIM 1 09/17/03 638 1823 -1185 000 NINVI 12/08/03 638 1829 -1191 000 -- -- _ — _- M V2 01187 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 -1312 000 94 <20 240 880 11,000 - N1W2 09/13/88 877 2432 -15 55 000 600 62 520 1,900 7,400 - M W 2 11/16/88 877 2447 -1570 000 840 140 650 1,600 10,000 -- M\V2 02/09/89 877 2902 -2025 000 480 55 660 1,700 7,200 -- N1 W 2 05/31/89 877 2569 -1692 000 680 62 800 3,100 17,000 -- N1W2 08/17/89 877 2733 -18 56 000 2,100 430 350 1,700 15,000 -- NIW2 12/19/89 877 2768 -1891 000 -- -- __ -- __ MW2 877 Well dry since 03/21/90 MW2 05/11/95 877 2419 -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 0 00 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 6 8 MW2 11/04/96 877 2277 -1400 000 25 <0 5 65 14 810 21 MW2 02/03/97 877 1861 -9 84 000 -- -- -- __ -- _- NI W 2 05/08/97 749 1825 -1076 000 1 2 <0 5 1 1 <0 5 73 <2 5 N1%V2 08/26/97 749 2003 -1254 000 -- -- -- __ -- -_ N1W2 11/11/97 749 2056 -1307 000 3 2 <0 5 34 0 71 160 5 2 111 W 2 03/03/98 749 1490 -7 41 000 14 <0 5 12 <0 5 110 3 3 N11'V2 03/03/98 749 <2 0* MW2 05/20/98 749 14 86 -737 000 1 5 <0 5 1 1 <0 5 110e 4 1 N1 W2 05/20/98 749 <2 0* MW2 08/19/98 749 1636 -8 87 000 <0 5 2 1 12 <0 5 110 <2 5 N4W2 08/19/98 749 <2 0* MW2 11/18/98 749 16 73 -924 000 -- -- -- -- -- -- MW2 03/30/99 749 -- -- __ g 1projectAN73942�nasterlwp1g120W942gw xis Page 5 of 51