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Estimated Contaminant Mass (Spherical) <br /> Estimated Mass Recalculated(based on boring on confirmation samples) <br /> Mass=(Volume of impacted zone)(soil density)(Average Concentration)(E-6); <br /> Soil density assumed 45.5 kg/cu,ft.(100lb/cu.ft.); <br /> Volume of sphere=4/3 pr3 <br /> Estimated Mass Pre-Excavation <br /> Volume in cu.ft.;vertical radii(thickness)of impacted zones are 9.5, 11, 12,and 13 ft.over estimated 13ft max radius and 8 ft min radius <br /> Max Radius of Min Radius of Average Mass of Mass of • <br /> Vertical Radius of Volume (cu.ft.) <br /> Contaminant Impacted Area Impacted Area Concentration Contaminant Contaminant <br /> (ft) ft Impacted Area (ft) (pi*r1*r2*r3*4/3) (mg/kg) (kg) (lbs) <br /> TPHg>1000 ppm 6 3 9.5 717 2100 68.5 150.6 <br /> TPHg 100-1000 ppm 10.5 6 11 2187 550 54.7 120.4 <br /> TPHg 10-100 ppm 12 7 12 1320 55 3.3 7.3 <br /> TPHg 1-10ppm 13 8 13 1442 5.5 0.4 0.8 <br /> 1271 279 <br /> Estimated Mass Post-Excavation <br /> Volume in cu. ft.;vertical radii(thickness)of impacted zones are 9.5, 11, 12,and 13 ft.over estimated 13ft max radius and 8 ft min radius <br /> Max Radius of Min Radius of Average Mass of Mass of <br /> Vertical Radius of Volume (cu.ft.) <br /> Contaminant Impacted Area Impacted Area Concentration Contaminant Contaminant <br /> (ft) (ft) Impacted Area (ft) (1/2*pi*r1*t2*r3*4/3) (mglkg) (kg) (lbs) <br /> TPHg>1000 ppm 6 3 9.5 358 1700 27.7 61.0 <br /> TPHg 100-1000 ppm 10.5 6 11 1094 550 27.4 60.2 <br /> TPHg 10-100 ppm 12 7 12 660 55 1.7 3.6 • <br /> TPHg 1-10 ppm 13 8 13 721 5.5 0.2 0.4 <br /> 571 125 <br /> Estimated Mass Removed Via Excavation 154 55.14% <br />