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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 ( /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 /> S W 1 05/16/00 -- -- -- _- -- -- -- -- -- -- <br /> 09/11/00 <br /> 12/13/00 -- __ <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 Ayr sparging well -- samples not collected <br /> 05/11/95 24 84 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 /> 08/08/96 -- Air sparging well -- samples not collected <br /> 11/04/96 2372 -- 000 110 <1 2 <1 2 20 320 <6 2 <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 /> 08/20/99 -- - __ -- -- -_ -- -- <br /> I2/06/99 <br /> 02/29/00 -- -- -- -- -_ -- -- -- <br /> f%projec[s%739421maslerl1Ap1g120013442gw xls Page 34 of 43 <br />