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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 ]eves TPH-g MTBE MW4 05/18/93 813 -- -- -- MW4 08/22/93 8 13 28 04 -1991 000 MW4 12/30/93 813 2785 -1972 000 MW4 02/17/94 8 13 2749 -1936 000 MW4 05/10/94 8 13 27 17 -1904 000 MW4 08/02/94 8 13 2863 -2050 000 MW4 11/01/94 8 13 2898 -2085 000 -- -- __ -- -_ MW4 02/17/95 8 13 2641 -1828 0 00 6 4 <0 5 3 2 3 4 880 MW4 05/11/95 8 13 23 84 -15 71 000 9 1 <1 0 8 7 2 9 520 -- MW4 08/24/95 8 13 2522 -1709 000 28 20 35 7 2 870 -- MW4 10/19/95 8 13 25 70 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -15 35 000 4 4 <1 0 12 1 1 750 -- MW4 04/18/96 8 13 21 17 -1304 000 10 <1 0 12 10 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 5 2 <0 50 450 7 4 MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 MW4 02/03/97 8 13 1832 -10 19 000 93 <2 0 11 3 5 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 0 83 3 5 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 8 9 0 80 058 <0 5 640 13 MW4 03/03/98 7 18 60* MW4 05/20/98 7 18 1455 -737 000 15 <5 0 35 9 1 1,100 <25 MW4 05/20/98 7 18 6 5* MW4 08/19/98 7 18 1606 -8 88 000 1 1 16 4 3 <0 5 680 <2 5 MW4 08/19/98 7 18 77* MW4 11/18/98 718 1640 -9 22 000 <0 5 14 54 <0 5 770 c 15 MW4 03/30/99 718 -- -- __ _- -_ MW4 05/05/99 7 18 1490 -772 000 <0 5 <0 5 l 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 000 140 1 51 <0 5 1 68 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 1 8 4 7 330 8 9 MW4 02/29/00 7 18 1412 -694 000 4 3 <1 <1 <1 100 7 MW4 05116100 7 18 1414 -696 000 19 <1 <1 <1 190 6 9 g\propects1739421mastcr\wp1g0602U9426w xIs Page 8 of43