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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 msl) (feet) (feet msl) _ (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW 12 03/03/98 875 1705 -830 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/03/98 875 <2 0* 05/20/98 875 1623 -748 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 05/20/98 875 <2 0* 08/19/98 875 1758 -883 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/19/98 875 <2 0* 11/18/98 875 18 10 -935 000 -- -- -- -- _- 03/30/99 875 1630 -755 000 -- -- -- -- -- _ 05/05/99 875 1644 -769 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 08/20/99 875 -- -- -- -- 12/06/99 875 02/29/00 875 -- -- -- 05/16/00 -05/16/00 875 1628 -753 000 -- -- -- -- -- __ 09/11/00 875 -- -- -- 12/13/00 875 -- -- -- -- -- -- -- -- 03/08/01 875 1730 -855 000 <0 5 <0 5 <0 5 4 5 <50 <0 5 06/21/01 875 18 62 -987 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW 13 05/18/93 949 3375 -2426 000 1 1 <0 5 <0 5 <1 71 -- 08/22/93 949 3505 -2556 000 <0 5 <0 5 <0 5 <0 5 <50 -- 12/30/93 949 3329 -23 80 000 <0 5 <0 5 <0 5 <0 5 <50 -- 02/17/94 949 3273 -2324 000 2 3 <0 5 <0 5 0 5 <50 -- 05/10/94 949 3200 -2251 000 1 1 <0 5 <0 5 <0 5 110 -- 08/02/94 949 3330 -23 81 000 13 6 8 5 9 35 620 -- 11/01/94 949 3397 -2448 000 <0 5 <0 5 <0 5 <0 5 <50 -- 02/17/95 949 3176 -2227 000 <0 5 <0 5 <0 5 <0 5 <50 -- 05/11/95 949 2890 -1941 000 <0 5 <0 5 <0 5 <0 5 <50 -- 08/24/95 949 2958 -2009 000 <0 5 <0 5 <0 5 <0 5 <50 -- 10/19/95 949 2997 -2048 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 02/13196 949 27 85 -1836 000 <0 5 <0 5 <0 5 <0 5 <50 -- 04/18/96 949 2527 -1578 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/08/96 949 2600 -1651 000 -- -- -- -- -- 11/04/96 949 2636 -16 87 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 g 1projects%739424zmastcrlwp1g6OlU942gw x1s Page 19 of 37