(a) Data is collected over a stretch of a river after an outfall introducing waste at a point distance, x=0km. The Table below provides numbers of bacteria as the water flows downstream. If the river is simulated as a Plug Flow system and stream velocity (U=m/d) what is the death rate coefficient Kd(d1) of the bacteria in the river. Use the Plug Flow Compartment Tool in AQAUSIM ver 2.3 to determine the unknown parameter. (15 pts ) (MPN= most probable number of bacteria as determined by a multiple tube technique)