(30)At noon on a sunny summer day with a surface wind speed of elevation of 4m/s (measured at 10m station), SO2 is released over smooth terrain (rural) from a 90m stack at a rate of 400g/s. Assume that the plume rise is 60m and the stability class for that day is B. a. (8)Calculate the wind speed at the stack height b. (4)Calculate the effective stack height. c. (18)Calculate the ground-level concentration at 3000m downwind in the centerline