2500 L of gasoline leaks from an underground storage tank connected to an abandoned gas station. The contaminated unconfined groundwater aquifer has a porosity of 0.3, a Darcy velocity of 0.2 m/d, and a hydraulic gradient of 0.00225. You detect this plume from your monitoring well close by. You know the dimensions of your rectangular plume are: 1000 m long, 3 m wide and 6 m deep, and the gasoline has a retardation factor of 4 (which applies to the velocity of the entire plume). NOT DRAWN TO SCALE! monitoring well extraction well, Qpump = 6000 m/d unsaturated zone ho = 10 m 12 = 1.0 km h = 8 m 12 = ?? km c. How long will it take the front end of the plume to reach the extraction well (in years)? d. Calculate the radius of influence, rz, needed to capture the entire gasoline plume at the extraction well given the conditions in the diagram. Assume nothing else changes except the extraction rate (i.e., heads stay the same) e. You discover the real radius needed to remove the entire plume is closer (i.e., 4 km). What would your new extraction rate need to be to extract the plume