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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( L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW9 08/19/98 6 57 44* MW9 11/18/98 657 1573 -916 000 <05 <05 <05 <05 310c 18 MW9 03/30/99 657 13 85 -728 000 -- -- -- __ MW9 05/05/99 657 1423 -766 000 <0 5 <0 5 <0 5 <0 5 931 5 12 MW9 08/20/99 657 1569 -9 12 000 -- -_ -_ MW9 12/06/99 657 15 83 -926 0 00 __ __ -- __ MW9 02/29/00 657 13 33 -676 000 <1 <1 <1 <1 <50 48 MW9 05/16/00 657 1339 -682 000 -- -- -- -_ MW9 09/11/00 657 -- __ __ MW9 12/13/00 657 -- -- -- MW9 03/08/01 657 1472 -8 15 000 <0 5 <0 5 <0 5 <0 5 <50 7 6 MW9 06/21/01 657 16 14 -957 000 <0 5 <0 5 <0 5 <0 5 110 17 MW9 06/21/01 657 19* MW9 09/20/01 657 17 17 -1060 000 -- -- -- MW9 12/04/01 652 1685 -1033 000 MW9 03/05/02 652 1600 -948 000 -- -- _- MW9 03/06/02 652 -- -- -- <0 5 <0 5 <0 5 <0 5 101 h 102 MW9 03/06/02 652 150* MW9 06/11/02 6 52 -- -- MW9 09/10/02 6 52 1772 -1120 000 MW9 12/18/02 652 1738 -1086 0 00 MW9 03/24/03 652 1696 -1044 0 00 -- -- _- MW9 03/25/03 6 52 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h 28 3 MW9 03/25/03 6 52 29 2* MW10 04/11/88 861 2318 -1457 000 640 130 170 140 3,100 -- MW 10 09/13/88 861 25 85 -1724 000 4,800 130 340 240 7,700 -- MW I0 11/16/88 861 26 08 -1747 000 5,800 290 700 340 9,400 MW 10 02/09/89 8 61 2570 -1709 000 7,500 450 220 320 8,800 _ MW10 05/31/89 861 2744 -18 83 000 11,000 320 1,600 800 24,000 - MWIO 08/17/89 861 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 -- MW 10 03/21/90 861 Not accessible -- -_ _- g Iprolects173942Vmaster\wpVgO303139426 w als Pabe 13 of 47