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0 0 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 MW4 02/03/97 8 13 1832 -1019 000 93 <2 0 11 3 5 1,400 17 MW4 05/08/97 718 1792 -1074 000 13 0 83 3 5 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 000 76 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 718 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 89 080 0 58 <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 91 1,100 <25 MW4 05/20/98 7 18 65* MW4 08/19/98 7 18 1606 -888 000 1 1 16 4 3 <0 5 680 <2 5 MW4 08/19/98 7 18 7 7* MW4 11/18/98 7 18 1640 -922 000 <0 5 14 54 <0 5 770 c 15 MW4 03/30/99 7 1$ MW4 05/05/99 7 18 1490 -772 000 <0 5 <0 5 1 14 <0 5 542 72 MW4 08/20/99 7 18 1645 -927 000 140 151 <0 5 1 68 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 18 4 7 330 8 9 MW4 02/29/00 7 18 1412 -694 000 4 3 <1 <1 <1 100 7 MW4 05/16/00 7 18 1414 -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 72 MW4 12/13/00 718 1635 -917 000 <0 5 58 082 5 1 360 13 MW4 12/13/00 7 18 10* MW4 03/08/01 718 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* MW4 03/05/02 7 12 1685 -973 000 320 <0 5 <0 5 <0 5 316 h 760 MW4 03/05/02 712 112* MW4 06/11/02 7 12 1741 -1029 000 29 <0 5 <0 5 <0 5 424 h 778 MW4 06/11/02 7 12 40 6* MW4 09/10/02 7 12 1853 -1141 000 24 <0 5 <0 5 <0 5 324 h 850 MW4 09/10/02 7 12 94 4* g 1projects1739421znasterlwplg070413942gw xis Page 10 of 54