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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 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 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 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 11/04/96 877 2277 -1400 000 25 <0 5 65 14 810 21 MW2 02/03/97 877 1861 -984 000 -- -- -- -- -_ -- MW2 05/08/97 749 1825 -1076 000 12 <0 5 1 1 <0 5 73 <2 5 MW2 08/26/97 749 2003 -1254 000 -- -- -- -- -_ -- MW2 11/11/97 749 2056 -1307 000 3 2 <0 5 3 4 071 160 5 2 MW2 03/03/98 749 14 90 -741 000 14 <0 5 12 <0 5 110 3 3 MW2 03/03/98 749 <2 0* MW2 05/20/98 749 14 86 -737 000 l 5 <0 5 1 1 <0 5 110e 4 1 MW2 05/20/98 749 <2 0* MW2 08/19/98 749 1636 -887 000 <0 5 2 1 12 <0 5 Ito <2 5 MW2 08/19/98 749 <2 0* MW2 11/18/98 749 1673 -924 000 -- -- -- -- -- -- MW2 03/30/99 749 -- -- -- MW2 05/05/99 749 1520 -7 71 000 -- -- -- -- -- -- MW2 08/20/99 749 1668 -919 000 101 4 56 808 242 253 68 1 MW2 12/06/99 749 1688 -939 000 <1 <1 <1 <1 52 <1 MW2 02/29/00 749 1442 -693 0 00 <1 <1 <1 <1 <50 <1 MW2 05/16/00 749 1445 -696 000 <1 <1 <1 <1 <50 <1 MW2 09/11/00 749 16 82 -933 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 12/13/00 749 1667 -9 18 000 2 6 1 5 9 69 <0 5 g Sprojects1739421masterlwp\gO60313942b%v x1s Page 5 of 48