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CAMBRIA <br /> Table 7.FAtimated TPHg and Benzene Masses Remaining in Groundwater-Shell-branded Service Station,6131 Pacific,Stockton,California <br /> Impacted GW Impacted GW Aquifer Volume Estimated Impacted Representative Total Dissolved <br /> Thickness Area Aquifer GW Volume Concentration Contaminant Mass <br /> (b) (sq-ft) (cu-ft) Porosity (gal) NA) Ob) <br /> Shallow Zone-Residual TPHg <br /> 33 1,750 57,750 0.40 172,788 42,000 60.6 <br /> 33 4,598 151,734 0.40 453,988 5,000 18.9 <br /> 33 7,564 249,612 0.40 746,839 500 3.12 <br /> Total Estimated Residual TPIlg: 82.6 <br /> Shallow Zone-Residual Benzene <br /> 33 301 9.933 0.40 29.720 1.150 0.285 <br /> 33 3,480 114,840 0.40 343,601 500 1.43 <br /> 33 6,073 200,409 0.40 599,624 50 0.250 <br /> 33 23,671 781,143 0.40 2,337,180 35 0.673 <br /> 33 42,509 1,402,797 0.40 4,197,169 5.0 0.175 <br /> Total Estimated Residual Benzene: 2.82 <br /> Nolen: <br /> Aquifer Volume=Impacted aquifer thickness x impacted GW area[excludes GW volume of greater impact] <br /> Impacted GW Volume=Aquifer volume(co-ft)x est.porosity(%)x 7.48(gallcu-ft) . <br /> Total Dissolved Contaminant Mass=GW volume(gal)x 3.785(1/gal)x Concentration(ug/b x 2.205 Ib/kg/1,000,000,000(ug/kg) <br /> Abbreviations: <br /> GW=Groundwater <br /> ft=feet <br /> sq-ft=square feet Soil True: Porosity f%) <br /> a-ft=cubic feel Gravel 25-40 <br /> gal gallons Sand 25-50 <br /> ugn micrograms per liter <br /> Clay 4470 <br /> lb pounds Silt 35-50 <br /> kg=kilograms <br /> 0854 Page]oil <br />