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l• � � � � � � (• I• •1• S� l• � l� I• � i• � � 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- No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW5 11/04/96 958 24 68 -1510 000 -- -- -- -- -- -- MW5 02/03/97 958 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/08/97 863 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 MW5 08/26/97 863 20 19 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 11/11/97 863 Well dry -- -- -- -- -- -; MW5 03/03/98 863 16 12 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 03/03/98 863 <2 0* MW5 05/20/98 863 1560 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/20/98 863 <2 0* MW5 08/19/98 863 1745 -8 82 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 08/19/98 863 <2 0* MW5 11/18/98 863 17 98 -935 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 03/30/99 863 -- -- -- -- -- -- -- -- -7 MW5 05/05/99 863 1641 -778 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW5 08/20/99 8 63 1787 -924 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 12/06/99 863 18 16 -9 53 000 <1 <1 <1 <1 <50 <1 MW5 02/29/00 863 15 59 -696 000 <1 <1 <1 <1 <50 <1f MW5 05/16/00 863 15 66 -7 03 000 <1 <1 <1 <1 <50 <l MWS 09/11/00 863 1801 -938 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW5 12/13/00 863 1795 -932 000 <0 5 <0 5 <0 5 065 190 <0 5 MW5 03/08/01 863 17 12 -849 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW5 06/21/01 8 63 1846 -9 83 000 <0 5 <0 5 <0 5 0 64 <50 <0 5 11IW5 09/20/01 863 1957 -1094 0.00 052 <0 5 <0 5 13 <50 <0 5 MW6 07/16/87 892 19 35 -1043 000 3,100 4,300 1,200 6,600 12,000 - MW6 04/11/88 892 2304 -13 67 062 Not sampled -LPH MW6 09/13/88 892 25 12 -1620 000 19,000 17,000 2,300 12,000 65,000 i i 0 b i)uolLCI�N?3942kinaSlLr\xpl41)01\31)42ou FIs Paye Il of 47 j