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1 ABLE 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 MW5 09/20/01 863 1957 -1094 000 052 <0 5 <0 5 1 3 <50 <0 5 MW5 12/04/01 858 1939 -1081 000 <0 5 <0 5 <0 5 <0 5 <50 <5* MW5 03/05/02 8.58 1860 -1002 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW6 07/16/87 892 1935 -1043 000 3,100 4,300 1,200 6,600 12,000 -- MW6 04/11/88 892 23 04 -1367 062 Not sampled-LPH MW6 09/13/88 892 25 12 -1620 000 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 2485 -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 000 -- -- -- MW6 892 Well dry since 03/21/90 - -- - MW6 05/11/95 892 25 13 -1621 000 48 25 19 56 720 MW6 08/24/95 892 2649 -1757 000 -- -- __ MW6 10/19/95 892 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 Well dry MW6 05/08/97 748 Well dry -- MW6 08/26/97 7 48 Well dry -- MW6 11/11/97 748 Well dry -- __ __ -- MW6 03/03/98 748 1555 -8 07 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 03/03/98 748 <2 0* MW6 05/20/98 748 1485 -737 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 05/20/98 748 <2 0* MW6 08/19/98 748 1671 -923 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 08/19/98 748 <2 0* MW6 11/18/98 748 17 16 -968 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 03/30/99 748 -- MW6 05/05/99 748 15 58 -8 10 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW6 08/20/99 748 1681 -933 000 -- __ -- g lprojectsl739421masier1wp1g0302�3942gw xls Page 10 of 39