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Mill TABLE i 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 ate (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE _ _ eet) (feet), MW5 12/06/99 8 63 18 16 -953 0 00 <1 <1 <1 <1 <50 <1 MW5 02/29/00 863 1559 -696 0 00 <1 <1 <1 <1 <50 <1 MW5 05/16/00 863 15 66 -7 03 0 00 <1 <1 <1 <1 <50 <1 MW5 09/11/00 863 1801 -938 0 00 <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 8 63 17 12 -849 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW5 06/21/01 8 63 1846 -983 000 <0 5 <0 5 <0 5 064 <50 <0 5 MW5 09/20/01 863 1957 -1094 000 052 <0 5 <0 5 1 3 <50 <0 5 MW5 12/04/01 8 58 1939 -1081 0 00 <0 5 <0 5 <0 5 <0 5 <50 <5* MW5 03/05/02 8 58 1860 -10 02 0 00 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 06/l 1/02 8 58 1906 -1048 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 09/10/02 858 2020 -1162 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 12/18/02 858 1999 -1141 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW6 07/16/87 892 1935 -1043 0 00 3,100 4,300 1,200 6,600 12,000 -- MW6 04/11/88 892 2304 -13 67 0 62 Not sampled-LPH MW6 09/13/88 892 25 12 -1620 0 00 19,000 17,000 2,300 12,000 65,000 -- MW6 11/16/88 892 2551 -1658 0 01 19,000 19,000 3,000 12,000 83,000 -- MW6 02/09/89 892 24 85 -1593 Sheen Not sampled-LPH MW6 05/31/89 892 2657 -1765 000 20,000 33,000 3,100 23,000 120,000 -- MW6 08/17/89 892 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- MW6 12/19/89 892 2880 -1988 0 00 -- -- -- -- -- MW6 892 Well dry since 03/21/90 MW6 05/11/95 892 25 13 -1621 0 00 48 25 19 56 720 -- MW6 08/24/95 892 2649 -1757 0 00 -- -- -- -- -- MW6 10/19/95 8 92 Well dry MW6 02/13/96 892 Well dry MW6 04/18/96 892 Well dry MW6 08/08/96 892 Well dry MW6 11/04/96 892 Well dry MW6 02/03/97 892 Weil dry MW6 05/08/97 748 Well dry 6 1Projects173942\MASTFRIWP\WPO303\3942gw xis Page l I of 45