6. A 30m stack releases a VBS at 20g/s with neutral buoyancy into a 1.5m/s wind. Background VBS concentrations arriving at the stack are 3.8gm3. Assume stability class urban C. Assume there is no inversion. a. Estimate the concentration of the VBS 500,1000 , and 5000m from the source. b. What percentage lower will particulate concentrations be at each distance if the concentration is estimated 50m perpendicular to the plume direction? c. What will be the % reduction in concentration of VBS estimate if it has a 1st order reaction coefficient of 0.1min1 at the three downwind points? d. Estimate the 24 hour average concentration at the 1000m downwind, centerline point