Answer Happy

21 Estimate the contaminant removal rate (in the presence of free-product phase) Recently, a gasoline spill occurred at a gasoline station and caused subsurface contamination. A soil venting well was installed at the site for remediation . A The following data were obtained from the remedial investigation and a pilot test: Pressure at the extraction well-09 atm Pressure at a monitoring well 30 ft away from the venting well - 0.95 atm Diameter of the venting well - 4 in Permeability of the formation - 1 Darcy Well screen length - 20 ft Viscosity of air -0.018 centipoise Temperature of the formation -20°C Estimate the contaminant removal rate at the beginning of the project. Q2 Estimate the contaminant removal rate in the absence of the free-product phase) A subsurface is contaminated with benzene. The average benzene concen tration of the soil samples, taken from the contaminated zone, was 500 mg/kg. The following data were obtained from the remedial investigation and a pilot test: Pressure at the extraction well - 0.9 atm Pressure at a monitoring well 30 ft away from the venting well - 0.95 atm Diameter of the venting well - 4 in Permeability of the formation=1 Darcy Well screen length - 20 ft Viscosity of air -0.018 centipoise Porosity -0.35 Organic content = 0.03 Water saturation = 45% Subsurface temperature -25°C Bulk density of soil - 1.7 g/cm Estimate the contaminant removal rate at the beginning of the project