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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW5 03/03/98 8 63 16 12 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 15 60 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 <br /> <2 0* <br /> 08/19/98 1745 -982 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/19/98 <2 0* <br /> 11/18/98 1798 -935 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 -- -- <br /> 05/05/99 1641 -778 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 1787 -924 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 12/06/99 18 16 -9 53 000 <1 <1 <1 <1 <50 <1 <br /> 02/29/00 15 59 -696 0 00 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 15 66 -7 03 000 <1 <1 <1 <1 <50 <1 <br /> 09/11/00 1801 -938 000 <0 5 <0 5 <0 5 <0 5 <50 <p 5 <br /> MW6 07/16/87 892 1935 -1043 000 3,100 4,300 1,200 6,600 12,000 -- <br /> 04/11/88 2304 -13 67 062 Not sampled-LPH <br /> 09/13/88 25 12 -1620 000 19,000 17,000 2,300 12,000 65,000 -- <br /> 11/16/88 25 51 -1658 001 19,000 19,000 3,000 12,000 83,000 -- <br /> 02/09/89 24 85 -15 93 Sheen Not sampled-LPH <br /> 05/31/89 2657 -1765 000 20,000 33,000 3,100 23,000 120,000 -- <br /> 08/17/89 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- <br /> 12/19/89 2880 -1988 000 -- __ _- <br /> Well dry since 03/21/90 <br /> 05/11/95 25 13 -1621 000 48 25 19 56 720 -- <br /> 08/24/95 2649 -1757 000 -- -_ __ <br /> 10/19/95 Well dry <br /> 02/13/96 Well dry -- __ -- -- -- -- <br /> 04/18/96 Well dry -- -- -- -- -- _- <br /> 08/08/96 Well dry <br /> 11104196 Well dry <br /> npiclectsl739421,,,asterlwplg9OOU9426w xls Pa6e 9 oF37 <br />