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i i • <br /> CAMBRIA <br /> Table 5 Estimated Benzene Mass Remaining in Soil -Chevron Station 9-1848 - 1257 W Yosemite Avenue, Manteca, California <br /> Impacted Soil impacted Soil Soil Volume Representative Benzene Estimated Soil Total impacted Total Residual Total Residual <br /> Thickness Area Concentration Bulk Density Soil Mass Benzene Mass in Soil Benzene Volume in Soil <br /> (ft) (sq-ft) (cu-ft) (mglkg) (lb/cu-ft) (lb) (lb) (gallons) <br /> 40 1,450 4,900 0 899 440,510 0 018 0 002 <br /> 1 0 900 900 2 899 80,910 0 121 0 017 <br /> 0 <br /> Total Estimated Residual Benzene 0 139 002 <br /> Notes: <br /> Soil Volume=Impacted soil thickness x impacted soil area[excludes soil volume of greater impact) <br /> Total Impacted Soil Mass=Soil Volume(cu-ft)x Bulk Density(lb/cu-ft) <br /> Residual Benzene Mass=Impacted soil mass(]b)x Concentration(mg/kg)/ 1,000,000(mg/kg) <br /> Benzene Mass to Benzene Volume=Mass Benzene lbs /7 32(lb/gal) 732 <br /> Approximate density benzene= F 54741 <br /> Bulk(Dry) <br /> Abbreviations Soil Type Density(lb/cu ft) <br /> ft=feet Sand 948 <br /> cu-ft=cubic feet Sandy loam 899 <br /> kg=kilograms Loam 849 <br /> mglkg=milligrams per kilogram Silt loam 799 <br /> sq-f3=square feet Clay loam 799 <br /> Clay 749 <br /> Peat 250 <br /> Derived from Hydrology for Engineers,Linsley,Kohler&Paulhus,1982,McGraw-Hill Inc pg 179 <br /> RW-1848 MantecalClosure%Copy of Mass Estimating Spreadsheet 11 03 Page I of 1 3/23/2006 <br />