An underground storage tank leaks tetrachloroethylene (PCE) at a rate of 100 mL/ day. This continues for a year before the leak is discovered and stopped. The tank lies at the water table, so all of the PCE released enters the sand aquifer (but not necessarily immediately dissolved in the groundwater). The aquifer is 4.0m deep and composed of sand with fraction of organic carbon of 1%). The actual groundwater velocity is 0.09m/d, and the hydraulic gradient is 0.0005 . The bulk density of the sand (B) is 1600kg/m3 while density of the sand (s) is 2420kg/m3. Specific gravity of PCE is 1.63g/mL or density of PCE is 1.63g/mL. Part A) Assume the dissolved PCE distributes uniformly in the aquifer and forms a plume 2.0m wide, 4.0m deep, and extending as far as you calculated. If there is a separate phase, calculate the mass of this phase? Part B) Estimate the time for PCE to be removed. Assume the concentration of PCE in the groundwater stays at its initial concentration until all of the PCE has been removed