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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 ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> RW4 08/19/98 7 86 17 51 -965 000 130 240 210 580 3,100 90 <br /> 08/19/98 <12* <br /> 11/18/98 1798 -10 12 000 300 480 400 970 5,600 <25 <br /> 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 /> 12/13/00 1785 -999 000 5 6 088 17 4 4 820 <0 5 <br /> 03/08/01 1710 -924 000 <0 5 1 1 3 5 13 9 640 5 5 <br /> SWI 02/17/94 Not accessible since 02/17/94 <br /> 02/17/95 2801 Air sparging 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 /> 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 /> 03/08/01 -- -- -- -- -- -- -- -- -_ <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 2484 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 /> I 1pprolecls17394212nasterlwp1g3011.3942gw xfs Page 32 of41 <br />