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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Gioundwater LPH Concentration( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene _ Xylenes TPH-g MTBE 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 18 32 -10 19 000 9 3 <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 11/11/97 718 2022 -1304 000 <20 <20 <20 <20 720c <10 MW4 03/03/98 7 18 1457 -739 000 89 0 80 058 <0 5 640 13 MW4 03/03/98 7 18 6 0* 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 N1W4 08/19/98 7 18 7 7* M W 4 11/18/98 7 18 1640 -922 000 <0 5 14 5 4 <0 5 770 c 15 MW4 03/30/99 718 -- -- -- -- -_ MW4 05/05/99 7 18 1490 -772 000 <0 5 <0 5 1 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 000 14 0 151 <0 5 168 460 203 N1 W4 12/06/99 7 18 1655 -937 000 <1 <1 1 8 4 7 330 8 9 MW4 02/29/00 7 18 14 12 -694 000 4 3 MW 05/16/00 7 18 14 14 -696 000 1 9 <1 <1 <1 190 6 9 MW4 09/11/00 7 18 1649 -931 000 <0 5 <0 5 <0 5 <0 5 330 7 2 MW4 12/13/00 7 18 1635 -9 17 000 <0 5 5 8 082 5 1 360 13 MW4 12/13/00 718 10* MW4 03/08/01 7 18 1549 -831 000 <0 5 <0 5 <0 5 <0 5 280 24 MW4 06/21/01 7 18 1682 -9 64 000 <0 5 <0 5 <0 5 <0 5 200 30 MW4 06/21/01 7 18 32* MW4 09/20/01 7 18 1796 -1078 000 <0 5 076 <0 5 191 270 36 MW4 09/20/01 7 18 40* MW4 12/04/01 7 12 1771 -1059 000 076 <0 5 <0 5 <0,5 69 74* L NIW5 07/16/87 958 1669 -7 11 000 <10 480 280 1,390 2,200 -- A/IW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- MpinteLLs173k142unaat r up�y]20113942,�%his Page 8 of 40