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CAMBRIA <br /> Table 7 Estimated TPHg Mass in Groundwater,Shell-branded Service Station,2494 East Fremont Street, 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) (ug/l or ppb) (lb) (gallons) <br /> Shallow Zone _ <br /> 200 251 5,020 043 16,146 43,000 58 094 <br /> 200 457 9,140 043 29 398 51000 1 23 020 <br /> 200 603 12,060 043 38,790 500 016 0 026 <br /> Deep Zane <br /> 100 844 8 440 037 23 359 7 000 14 022 <br /> 100 1,201 12,010 037 33,239 5 000 14 023 <br /> 100 4,764 47,640 037 131,848 500 06 009 <br /> Total Estimated TPHg Mass 105 171 <br /> Notes <br /> Impacted GW area excludes GW area of higher concentration <br /> Aquifer Volume=Impacted aquifer thickness x impacted GW area <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(Vgal)x Concentration(ug/1)x 2 205 lb/kg 11,000,000 000(uglkg) <br /> Total Dissolved TPHg Volume=Mass(lb)/6 14(lbs/gal) <br /> Approximate density TPHg=6 14 Ib/gal <br /> Abbreviations <br /> GW=Groundwater <br /> ft=feet <br /> sq ft=square feet Sod Type Porosity(%) <br /> cu ft=cubic feet Gravel 25-40 <br /> gals=gallons Sand 25-50 <br /> kg=kilograms Silt 35-50 <br /> Ib=pound Clay 40-70 <br /> ug/1=micrograms per liter <br /> ppb=parts per billion From Groundwater, Freeze&Cherry, 1979,Prentice-Hall, Inc, pg 37 (based on Davis, 1969) <br /> 0797 Page I of 1 <br />