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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 (jteJ,) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 05/11/95 8 13 2384 -1571 000 91 <10 8 7 2 9 520 MW4 08/24/95 813 2522 -1709 000 28 20 35 7 2 870 MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -1535 000 4 4 <10 12 1 1 750 MW4 04/18/96 8 13 21 17 -13 04 000 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 -1019 000 9 3 <2 0 11 35 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 083 3 5 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 000 7 6 <10 <10 <10 440 c 12 MW4 11/11/97 7 18 2022 -13 04 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 89 080 058 <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 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 5 4 <0 5 770 c 15 MW4 03/30/99 718 -- MW4 05/05/99 7 18 14 90 -772 000 <0 5 <0 5 1 I4 <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 1 8 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 -931 000 <0 5 <0 5 <0 5 <0 5 330 7 2 MW4 12/13/00 7 18 1635 -9 17 000 <0 5 58 0 82 5 1 360 13 MW4 12/13/00 7 18 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* MW4 03/05/02 7 12 1685 -973 000 320 <0 5 <0 5 <0 5 316 h 760 g 1proJec[s1739421masteAwp1g0902U942gw xls Page 8 of 41