4. Brine (chloride) is leaking into the water table. The concentration of chloride is 1575 mg/L. The flow that receives the brine is essentially one-dimensional and has the following characteristics: hydraulic conductivity = 2.93x10-4 m/s hydraulic gradient = 0.00678 porosity = 0.259 diffusion coefficient = 2.0 x10-9 m2/s dispersivity = 5.0 m Calculate the concentration of chloride at a distance 125 m from the leak at t = 0.50 yr