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s • • TABLE 1 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 05/20/98 7 18 6 5* 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 770c 15 MW4 03/30/99 718 -- -- -_ __ -- MW4 05/05/99 7 18 1490 -7 72 000 <0 5 <0 5 1 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 0 00 140 151 <0 5 168 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 1 8 4 7 330 89 MW4 02/29/00 7 18 14 12 -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 7 2 MW4 12/13/00 718 1635 -917 000 <0 5 58 0 82 5 1 360 13 MW4 12/13/00 7 18 10* MW4 03/08/01 7 18 1549 -8 31 000 <0 5 <0 5 <0 5 <0 5 280 24 MW4 06/21/01 7 18 16 82 -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 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 850 MW4 09/10/02 7 12 94 4* MW4 12/18/02 7 12 1828 -11 16 0 00 18 <0 5 <0 5 <0 5 301 h 82 6 MW4 12/18/02 7 12 92 0* MW5 07/16/87 958 1669 -711 000 <10 480 280 1,390 2,200 -- MW5 04/11/88 958 22 86 -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 -15 73 000 <1 3 19 25 24 910 -- G Trogecis173942WAs rLR\WPffP030M3942g%ids Page 9 of 45