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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 /> S W 1 04/18/96 -- -- Air sparging well-- samples not collected <br /> 08/08/96 -- 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 /> 05/20/9$ -- <br /> 08/19/98 <br /> 11/18/98 <br /> -- <br /> 03/30/99 <br /> 05/05/99 -- -- -- -- __ -- -- -- -- <br /> 08/20/99 -- -- -- -- -- -- -- -- -- <br /> 12/06/99 -- -- -- -- -_ -- -- -- -- -- <br /> 02/29/00 -- -- -- -_ -- - -- -_ -- <br /> 05/16/00 <br /> 09/11/00 -- -- -- -- -- -- -- -- -- -- <br /> 12/13/00 -- -- -- <br /> 03/08/01 <br /> 06/21/01 <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 Air 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 spargmg well--samples not collected <br /> 11/04/96 2372 -- 000 110 <1 2 <1 2 2 0 320 <6 2 <br /> 02103197 -- -- -- -- <br /> g 1prujccts1739421masterlwp1g40]U942gwxls Page 29 of 37 <br />