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CAMBRIA_ <br /> Table 8 Estimated Benzene Mass in Groundwater,Shell-branded Service Station,2494 East Fremont Street, 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) (ugtl or ppb) (lb) (gallons) <br /> Shallow Zone <br /> 200 1075 215 043 692 650 000375 000051 <br /> 200 1075 215 043 692 500 000289 000039 <br /> 200 2150 430 043 1,383 50 000058 000008 <br /> 200 19700 3 940 043 12,673 so 000053 000007 <br /> Deep Zone <br /> 100 293 2,930 037 8 109 265 00018 000024 <br /> 100 2 709 27,090 037 74,974 5 00031 000043 <br /> Total)Estimated Benzene Mass 00127 Tabl <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 Benzene Mass=GW volume(gals)x 3 785(Ilgal)x Concentration(ugll)x 2 205 lb/kg!1 000,000 000(ug/kg) <br /> Total Dissolved Benzene Volume=Mass(lb)/7 33(lbs/gal) <br /> Approximate density Benzene=7 33 lb/gal <br /> Abbreviations <br /> GW=Groundwater <br /> ft=feet <br /> sq-ft=square feet Soil Tyne Porosity % <br /> cu-ft=cubic feet Gravel 25-40 <br /> gals=gallons Sand 25-50 <br /> kg=kilograms Silt 35-50 <br /> lb=pound Clay 40-70 <br /> ugn=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 1 of 1 <br />