Master Proposed Book FY2023

• Wastewater debt service consists of principal and interest payments on wastewater revenue bonds, which are repaid with wastewater revenue. • Wastewater Capital Reserves accounts for wastewater funds that are set aside for the replacement of wastewater and sanitary sewer infrastructure. Recent Accomplishments: • Completed construction for the replacement of existing 1.0KW Generator with a 2KW generator, that will operate the full plant electrical load in emergency conditions was completed in 2020. • Installed air conditioning for control rooms at the new sludge digester complex, grit removal and blower building, this will extend variable frequency drive and other electronics life. • Performed a mixer study in Aeration Train One using an energy efficient mixer to observe compatibility, mixing action and consumption. Information to be used for upcoming CIP Mixer Replacement Project. • Updated Napoleon Lift Station pump drives from soft starts to VFD’s. This allows the pumps to match the incoming flows and increase energy efficiency during operation. • Purchase of E-ride utility trucks for maintenance staff to use around the plant rather than a gas engine full-size pick-up. • Completion of the Melrose Court Sanitary Sewer Replacement was accomplished before the University of Iowa football season started. There are some minor punch list items to complete this fall. • Rebuild of Tank 8001 mixer completed. • Continue with the yearly sewer maintenance program including lining and spot repairs. • Continued review of development projects within the City in conjunction with the Engineering Department, to ensure that City standards are followed, and that development meets the City’s long-term goals. Upcoming Challenges: • Review the recommendations of the Methane Feasibility Study to develop a methane recovery and utilization strategy to work towards the City Council goals as set out in the Iowa City Climate Action and Adaptation Plan. • Replace failed brick façade and top seal for sludge storage tank 8801 as well as replace internal piping. • Initiate a study to determine improvements and replacement of equipment and structures in the digester complex. Study to incorporate findings from the Methane Feasibility Study. • Digester Complex Rehabilitation Project that includes findings from the aforementioned study and addresses phosphorous removal/remediation. • Replacement of the influent pump station bar screen mechanisms with new and include screenings compactors and associated buildings and equipment. This work will include paving the screenings roll off access and the dewatering roll-off use for car wash sand loads, drilling fluids and concrete saw waste.

238