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TABLE G-4 Page 1 of 1 <br /> ESTIMATED BENZENE 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 Benzene Total Dissolved Total Dissolved <br /> Thickness Area Aquifer GW Volume Concentration Benzene Mass Benzene Volume <br /> (ft) (sq-ft) (cu-ft) Porosity (gallons) (ug/1) (lb) (gallons) <br /> Shallow Zone <br /> 20.00 1,886 37,720 0.4 112,858 5.5 0.01 0.00 <br /> 20.00 503 10,060 0.4 30,100 55.0 0.01 0.00 <br /> 20.00 218 4,360 0.4 13,045 525.0 0.06 0.01 <br /> 20.00 253 5,060 0.4 15,140 0.6 0.00 0.00 <br /> Total Estimated Residual Shallow Zone benzene: 0.08 0.01 <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 Benzene Mass=GW volume(gals)x 3.785(1/gal)x Concentration(ug/1)x 2.205 lb/kg/1,000,000,000(ug/kg) <br /> Total Dissolved Benzene Volume=Mass(lb)/7.33(lbs/gal) <br /> Total Estimated SPH Mass=Impacted GW volume(gals)x approximate density(7.33 lb/gal) <br /> Approximate density of Benzene=7.33 lb/gal <br /> Abbreviations: Soil Type: Porosity <br /> GW=Groundwater Gravel 25-40 <br /> ft=feet Sand 25-50 <br /> sq-ft=square feet Silt 34-50 <br /> cu-ft=cubic feet Clay 40-70 <br /> kg=kilograms <br /> lb=pound <br /> ug/1=micrograms per liter <br /> lb/gal=pounds per gallon <br /> CRA 240797(18) <br />