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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 Xylenes TPH-g MTBE MW4 05/08/97 7 18 1792 -1074 000 13 083 35 <0 5 780 l0 MW4 08/26/97 7 18 1971 -1253 000 76 <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 03/03/98 718 1457 -739 000 89 080 058 <0 5 640 13 MW4 03/03/98 718 6 0* MW4 05/20/98 7 18 1455 -737 000 15 <5 0 35 9 1 ],too <25 MW4 05/20/98 7 18 65* MW4 08/19/98 7 18 1606 -888 000 1 1 16 43 <0 5 680 <2 5 MW4 08/19/98 718 7 7* MW4 11/18/98 7 18 1640 -922 000 <0 5 1 4 54 <0 5 770 c 15 MW4 03/30/99 718 -- -- MW4 05/65/99 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 1 51 <0 5 168 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 1 8 47 330 89 MW4 02/29/00 718 1412 -694 000 43 <1 <1 <1 100 7 MW4 05/16/00 7 18 14 14 -696 000 1 9 <1 <1 <1 190 69 MW4 09/11/00 7 18 1649 -931 000 <0 5 <0 5 <0 5 <0 5 330 72 MW4 12/13/00 7 18 1635 -9 17 000 <0 5 5 8 082 5 1 360 13 MW4 12/13/00 718 ]0* 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 16 82 -964 000 <0 5 <0 5 <0 5 <0 5 200 30 MW4 06/21/01 718 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 03/05/02 712 1685 -973 000 320 <0 5 <0 5 <0 5 316 h 760 MW4 03/05/02 712 MW4 06/11/02 7 12 1741 -1029 000 29112*9 <0 5 <0 5 <0 5 424 h 7728 MW4 06/11/02 712 MW4 09/10/02 712 18 53 -1141 000 24 <0 5 <0 5 <0 5 324 h 485 0 MW4 09/10/02 712 MW4 12/18/02 7 12 1828 -11 16 000 1 8 <0 5 <0 5 <0 5 301 h 826 g 1projecls1739421roasicTlwplgo343U9421,,w As Pabe 9 of 47