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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(jig/L2 Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE 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 7 7* MW4 11/18/98 7 18 1640 -922 000 <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 1 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 000 14 0 151 <0 5 168 460 203 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 19 <1 <1 <1 190 6 9 MW4 09/11/00 7 18 1649 -931 0 00 <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 0 82 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 0 76 <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 2 9 <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 2 4 <0 5 <0 5 <0 5 324 h 85 0 MW4 09/10/02 7 12 94 4* MW4 12/18/02 7 12 18 28 -11 16 000 1 8 <0 5 <0 5 <0 5 301 h 82 6 MW4 12/18/02 7 12 92 0* MW4 03/24/03 7 12 1780 -1068 000 <0 5 <0 5 <0 5 <0 5 402 h 723 MW4 03/24/03 7 12 72 5* MW4 06/11/03 7 12 1793 -1081 000 230 0 6 <0 5 <0 5 372 h 68 6 MW4 06/11/03 7 12 62 6* MW4 09/17/03 7 12 1927 -12 15 000 330 <0 5 <0 5 <0 5 547 b 108 MW4 09/17/03 712 114* g 1pro3ects1739421mas1eAwplq I205\3942gw xis Page 11 of 59 I