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TABLE 1 GROUNDWATER MONTI ORING DATA, FORMER EXXON RS 7-3942,4444 N PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µglL) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (ft ms I) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> SWI 05/08/97 -- -- -- -- -- -- -- - <br /> 08/26/97 -- -- -- -- - <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 /> 08/20/99 -- -- -- <br /> 12/06/99 _- <br /> 02/29/00 -- -- -- <br /> 05/16100 -- -- -- -- -- -- -- -- -- <br /> SW2 02/17/94 2870 -- 000 660 2,000 770 3,600 29,000 <br /> Not accessible since 02/17/94 <br /> 02/17/95 2757 Au sparging well-- samples not collected <br /> 05/11/95 24 84 Air spargmg well-- samples not collected <br /> 08/24/95 -- Air spargmg well-- samples not collected <br /> 10/19/95 -- Air spargmg well--samples not collected <br /> 02/13/96 -- Air spargmg well--samples not collected <br /> 04/18/96 -- Air spargmg well--samples not collected <br /> 08/08/96 -- Air spargmg well--samples not collected <br /> 11/04/96 2372 -- 000 110 <1 2 <1 2 2 0 320 <6 2 <br /> 02/03/97 -- -- -- -- -- _- -- -- -- <br /> 05/08/97 -- -- -- -- -- <br /> 08/26/97 -- -- -- <br /> 11/11/97 -- -- -- <br /> 03/03/98 -- -- -- -- <br /> 05120198 -- -- -- - -- <br /> fVrojects%739421nasterlwp\Q50013942gw xis Page 29 of 37 <br />