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TABLE I 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 /> RW4 08/19/98 786 1751 -9 65 000 130 240 210 580 3,100 90 <br /> 08/19/98 <12* <br /> 11/18/98 1798 -10 12 000 300 480 400 970 5,600 <25 <br /> 03/30/99 -- -- -- -- -- -- -- -- <br /> 05/05/99 <br /> 08/20/99 <br /> 12/06/99 <br /> 02/29/00 -- -- -- -- -- -- -- -- <br /> 05/16/00 1520 -734 000 5 6 57 220 363 2,500 21 <br /> 09/11/00 1795 -1009 000 5 7 58 17 7 7 550 <0 5 <br /> S W 1 02/17/94 -- Not accessible since 02/17/94 <br /> 02/17/95 2801 Air spargmg well--samples not collected <br /> 05/11/95 -- Air sparging well-- samples not collected <br /> 08/24/95 -- Air sparging well--samples not collected <br /> 10/19/95 -- Air sparging well--samples not collected <br /> 02/13/96 -- Air sparging well--samples not collected <br /> 04/18/96 -- Air sparging well--samples not collected <br /> 08108/96 Air sparging well--samples not collected <br /> 11/04/96 2424 -- 000 2,400 3,100 290 2,800 25,000 <250 <br /> 02/03/97 -- -- __ -- -- -- -- -- <br /> 05/08/97 -- -- -- -- -- -- _- -- <br /> 08/26/97 <br /> 11/11/97 -- -- -- -- -- -- -- -- - <br /> 03/03/98 <br /> 05/20/98 <br /> 08/19/98 -- -- <br /> 11/18/98 <br /> 03/30/99 -- -- -- -- -- -- -- -- <br /> 05/05/99 <br /> 08/20199 -- -- -- -- -- -- <br /> f IProieLts%739421masterlwplg900U942bn zls Pate 23 af37 <br />