The town of Chicagol has a wastewater treatment plant with a complete mixed activated sludge process that removes CBOD only. If the town must upgrade the facility to remove ammonia, how should the system be re-designed? Speak to the following aspects numbered A through E. In your answers, compare the original system (CBOD removal) versus the upgraded system (CBOD plus ammonia removal). Assume that the plant receives 1.75 MGD of average daily flow with a peaking factor of 2.6. The influent total COD is 330 mg/L with an ammonia concentration of 35 mg-N/L. A. What microbial populations are required for the two systems? B. What is the range of SRTS required for each system? C. What is the range of HRTS required for each system? D. If the original system is already built for the design capacity of CBOD removal, how much more volume may be needed to remove ammonia?