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TABLE G-3 Page 1 of 1 <br /> ESTIMATED TPHG MASS IN GROUNDWATER QUNE 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 TPHg Total Dissolved Total Dissolved <br /> Thickness Area Aquifer GW Volume Concentration TPHg Mass TPHg Volume <br /> (ft) (sq-ft) (cu-ft) Porosity (gallons) (µg/1) (lb) (gallons) <br /> Shallow Zone <br /> 20 900 18,000 0.4 53,856 550 0.25 0.04 <br /> 20 633 12,660 0.4 37,879 5,500 1.74 0.28 <br /> 20 407 8,140 0.4 24,355 37,000 7.52 1.22 <br /> Total Estimated Residual Shallow ZoneTPHg: 9.51 1.55 <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 TPHg 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 TPHg Volume=Mass(lb)/6.14(lbs/gal) <br /> Total Estimated SPH Mass=Impacted GW volume(gals)x approximate density(6.14 lb/gal) <br /> Approximate density of TPHg=6.14 lb/gal <br /> Abbreviations: Soil Type: Porosity <br /> TPHg=Total Petroleum Hydrocarbons as Gasoline Gravel 25-40 <br /> GW=Groundwater Sand 25-50 <br /> ft=feet Silt 34-50 <br /> sq-ft=square feet Clay 40-70 <br /> cu-ft=cubic feet <br /> kg=kilograms <br /> Ib=pound <br /> ug/1=micrograms per liter <br /> Ib/gal=pounds per gallon From:Groundwater;Freeze&Cherry,1979,Prentice-Hall,Inc.,pg.37.(based on Davis,1969) <br /> CRA 240797(18) <br />