Overview
The purpose of the proposed project is to install an additional disinfection barrier at the Ann Arbor drinking water treatment plant to assist with meeting new regulations for the treatment of cryptosporidium. Cryptosporidium is a microscopic waterborne parasite that can be found in stormwater runoff, agricultural runoff, failed septic systems or sewage overflows. The city's current treatment processes, including ozone disinfection and filtration, are effective at removing cryptosporidium, but new regulations require additional treatment.
Project construction will involve installation of a new UV water disinfection system inside the existing water treatment plant building. Project components include UV equipment, pipes, valves, electrical and instrumentation equipment. The project will use existing water treatment plant facilities to minimize cost and maximize operational efficiency.
Impacts from the proposed project may include intermittent deliveries or construction-related traffic in the vicinity of the City of Ann Arbor Water Treatment Plant site during daytime hours July 2019 through August 2020. All work activities related to this project will be conducted within the site limits of the City of Ann Arbor Water Treatment Plant.
The estimated cost to users for the proposed project will be approximately $152,891 annually for the debt repayment period of 20 years, representing a total project cost of approximately $2,500,000. For the average residential customer using 18 cubic feet (CCF) per quarter, this represents a 0.725 percent increase in rates, or $0.96 annually, and $19.20 total, for the duration of the debt repayment for this project.
Project costs
The estimated cost to users for the proposed project will be approximately $152,891 annually for the debt repayment period of 20 years, representing a total project cost of approximately $2,500,000. For the average residential customer using 18 CCFs per quarter, this represents a 0.725% increase in rates, or 96 cents annually, and $19.20 total for the duration of the debt repayment for this project.
Plan copies
Copies of the plan detailing the proposed project are available for inspection at the Water Treatment Plant at 919 Sunset Road in Ann Arbor.
