Question

A tank truck which is carrying water containing 22,000 mg/L of dissolved benzene overturns and spills a volume of water sufficient to saturate a thin aquifer over an area of 25 m2. The aquifer contains ground water flowing with an average linear velocity of 0.35 m/day. Assume that the values of DL and DT are 3.2 and 0.25 m2/day respectively. There is a nearby private well at a seasonal cottage. The center of the spill is at (0,0) and the well is at (120, 9) in meters. The owners of the well are away for the season and will not return for 1 year. If there is no degradation or retardation of the benzene as it moves through the aquifer, what will the concentration of benzene be in the private well when the owners return?

Answer 1