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TABLE 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 2900 East Harding Way,Stockton,California <br /> [analytical results in micrograms per liter(ug/L)] <br /> Q N <br /> C m <br /> CD m N N <br /> Wellhead GW m m c m e <br /> Date Well ID DTW TPI-Ig TPI-Id c m m m TBA 1,2-DCA EDB <br /> Elevation Elevation m p t+ <br /> m H r X X <br /> w <br /> 05/06/10 MW1 22.88 53.31 -30.43 480 1,400 1.1 <0.5 <0.5 <1.0 - <0.5 <5.0 2.3 <0.5 <br /> MW2 23.29 53.77 -30.48 <50 <50 <0.5 <0.5 <0.5 <1.0 - 0.91 <5.0 17 <0.5 <br /> MW3 22.65 53.10 -30.45 <50 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <5.0 <0.5 <0.5 <br /> MW4 22.60 53.03 -30.43 <50 <50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> MW5 23.46 53.97 -30.51 <50 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <5.0 <0.5 <0.5 <br /> 10/21/10 MW1 22.88 53.31 -30.43 89 410 1.7 <0.5 <0.5 <1.0 <0.5 <5.0 5.8 <0.5 <br /> MW2 23.29 53.79 -30.50 <50 <50 <0.5 <0.5 <0.5 <1.0 - 1.5' <5.0 26 <0.5 <br /> MW3 22.65 53.10 -30.45 <50 _<50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> MW4 22.60 53.03 -30.43 <50 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <5.0 <0.5 <0.5 <br /> MW5 23.46 53.97 -30.51 <50 <50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> 02/04/11 MW1 22.88 51.50 -28.62 130 1,100 1.1 <0.5 <0.5 <1.0 - <0.5 <5.0 2.6 <0.5 <br /> MW2 23.29 51.96 -28.67 <50 <50 <0.5 <0.5 <0.5 <1.0 - 1.3 t <5.0 34 <0.5 <br /> MW3 22.65 51.29 -28.64 <50 <50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> MW4 22.60 51.23 -28.63 <50 <50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> MW5 23.46 52.14 -28.68 <50 <50 <0.5 <0.5 <0.5 <1.0 - <0.5 <5.0 <0.5 <0.5 <br /> Notes: <br /> DTW =Measured depth to groundwater in well(feet) <br /> GW Elev =Groundwater Elevation-Calculated groundwater elevation in well(feet MSL) <br /> TPHg =Total Petroleum Hydrocarbons as Gasoline <br /> TPHd =Total Petroleum Hydrocarbons as Diesel <br /> Fuel Oxygenates =methyl ter/-butyl ether,dl-isopropyl ether,ethyl tert-butyl ether,and ter/-amyl methyl ether <br /> TBA =t-Butanol <br /> 1,2-DCA =1,2-Dichloroethane <br /> EDB =1,2-Dibromoethane <br /> • =methyl tert-butyl ether only(not detected above 50 ug/L) <br /> =Not analyzed <br /> < =Less then method detection limit(not detected) <br /> =methyl tert-butyl ether <br /> Wellhead elevations after the 6/11/09 event use resurveyed data by Epic Land Surveying,Inc. <br /> G:IGROUNDZEIWCTOMATOIWCT-Invest/gationlTableslGWcombinedtable.xls Page 2 of 2 2114111 <br />