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! • i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration (Eg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 03/03/98 7 18 1457 -739 000 8 9 080 058 <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 6 5* MW4 08/19/98 7 18 l6 06 -8 88 000 1 l 16 43 <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 1490 -772 000 <0 5 <0 5 1 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 000 140 151 <0 5 168 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 18 47 330 8 9 MW4 02/29/00 7 18 14 12 -694 000 4 3 <1 <1 <1 100 7 MW4 05/16/00 7 18 14 14 -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 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 06/21/01 718 32* MW4 09/20/01 7 18 1796 -1078 000 <0 5 076 <0 5 191 270 36 MW4 09/20/01 718 40* MW4 12/04/01 7 l2 1771 -1059 000 076 <0 5 <0 5 <0 5 69 74* MW4 03/05/02 712 16.55 -9.73 000 320 <0 5 <0 5 <0 5 316 h 76.0 MW4 03/05/02 712 112* MW5 07/16/87 9 58 1669 -7 11 000 <10 480 280 1,390 2,200 MW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 MW5 09/13/88 958 2533 -1575 000 4 4 650 50 110 1,400 -- MW5 11/16/88 958 2531 -1573 000 <1 3 19 25 24 910 MW5 02/09/89 958 25 09 -1551 000 3 4 12 15 22 1,250 MW5 05/31/89 958 2672 -1714 000 <0 5 14 24 46 790 MW5 08/17/89 958 2844 -1886 000 10 29 13 12 1,200 -- MW5 12/19/89 958 2945 -1987 000 -- -- -_ __ MW5 958 Well dry since 03/21/90 g\nrojects173942Viiasterlwplg030213942gw x1s Page 9 of 39