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TABLE G-5 Page 1 of 1 <br /> ESTIMATED 1,2-DCA MASS IN GROUNDWATER(JUNE 18,2013 <br /> SHELL-BRANDED SERVICE STATION <br /> 2494 EAST FREMONT STREET <br /> STOCKTON,CALIFORNIA <br /> Impacted GW Impacted GW Aquifer Volume Estimated Impacted Representative 1,2-DCA Total Dissolved Total Dissolved <br /> Thickness Area Aquifer GW Volume Concentration 1,2-DCA Mass 1,2-DCA Volume <br /> (ft) (sq-ft) (cu-ft) Porosity (gallons) (µg/1) (lb) (gallons) <br /> Shallow Zone <br /> 20.00 22,843 456,860 0.4 1,366,925 5.5 0.06 0.0060 <br /> 20.00 12,296 245,920 0.4 735,793 55.0 0.34 0.0323 <br /> 20.00 6,198 123,960 0.4 370,888 135.0 0.42 0.0400 <br /> Deep Zone <br /> 15.00 6,350 95,250 0.4 284,988 2.3 0.01 0.0005 <br /> Total Estimated Residual 1,2-DCA on Shell and Former Arco Site: 0.82 0.0788 <br /> Total Estimated Residual 1,2-DCA on Shell Site: 0.41 0.04 <br /> Notes: <br /> Aquifer Volume=Impacted aquifer thickness x impacted aquifer area[excludes aquifer volume of greater impact] <br /> Impacted GW Volume=Aquifer volume(cu-ft)x est.porosity(%)x 7.48(gals/cu-ft) <br /> Total Dissolved 1,2-DCA Mass=GW volume(gals)x 3.785(1/gal)x Concentration(ug/1)x 2.2051b/kg/ 1,000,000,000(ug/kg) <br /> Total Dissolved 1,2-DCA Volume=Mass(lb)/10.45(lbs/gal) <br /> Approximate density of 1,2-DCA=10.45 lb/gal <br /> Assumed half the 1,2-DCA mass in groundwater on Shell site. <br /> Abbreviations: Soil Type: Porosi <br /> 1,2-DCA= 1,2-Dichloroethane Gravel 25-40 <br /> GW=Groundwater Sand 25-50 <br /> ft=feet Silt 35-50 <br /> sq-ft=square feet Clay 40-70 <br /> cu-ft=cubic feet <br /> kg=kilograms <br /> lb=pound <br /> µg/1=micrograms per liter <br /> lb/gal=pounds per gallon From:Groundwater;Freeze&Cherry, 1979,Prentice-Hall,Inc.,pg.37.(based on Davis,1969) <br /> CRA 240797(18) <br />