A slow leak from an underground storage tank has contaminate…

A slow leak from an underground storage tank has contaminated both the soil and the groundwater as shown below. Soil contaminated  above the groundwater table (in the shape of a rectangular prism):              Volume: 20 m3                       Soil density:  1800 Kg/m3                    Porosity:  0.3                    Contaminant concentration:    800 mg/Kg Soil contaminated below the ground water table (note: groundwater plume is in the shape of a cone):             Volume:   3000 m3                     Porosity:  0.3                                Contaminant concentration in groundwater:  4000 mg/L Amount of contaminant present in the soils contaminated just below the tank but above the groundwater (n the shape of a rectangular prism) is most nearly (Kg):  

400 cubic yards of gasoline-contaminated soil will be treate…

400 cubic yards of gasoline-contaminated soil will be treated using bioremediation.  The soil has low organic content.  It is desired to bring the water moisture level to 60% to maintain high reaction rates.  Calculate how much water (cubic feet) should be added. Soil porosity, n = 30% Initial saturation, S = 20% Conversion: 1 yd = 3 ft

Hydraulic conductivity of soil is measured as 2×10-2  cm/sec…

Hydraulic conductivity of soil is measured as 2×10-2  cm/sec.  After an accident, a truck carrying dissolved salt solution releases its contents to surface.  The distance between the spill and a groundwater well is 1600 meter.  The groundwater elevation at the spill location is 5.5 meter and well location is 5.3 meters. Porosity of soil is 0.4.  Travel time of contaminant to the well is most nearly (years):