A cylindrical volume of soil contaminated with trichloroethylene (TCE). It is about 2.5 m deep and about 4.0 m in diameter. The porosity of the soil is approximately 0.25. The residual saturation of TCE NAPL averages Sn = 0.09. Assuming you could flush water through this zone at a rate of 240 L/day, estimate the minimum amount of time required to dissolve away the entire mass of TCE NAPL in the contaminated zone. Discuss how and why you think the actual volume pumped in a real clean-up situation would differ from what you have calculated.