FY2022

Wastewater/Storm water Collection Systems The Wastewater Division maintains 320 miles of sanitary sewers and 110 miles of dedicated storm sewers. The wastewater collection system works in conjunction with the wastewater lift stations. The storm water collection system works in conjunction with the storm water lift stations and point of discharge to receiving streams. The sanitary sewer and storm water collection systems are maintained by jetting and vacuuming. Portions are periodically televised to determine status and to calculate repair priorities. Wastewater debt service consists of principal and interest payments on wastewater revenue bonds, which are repaid with wastewater revenue. HIGHLIGHTS Recent Accomplishments: • Recently installed biosolids dewatering presses (BFP’s), division staff are currently operating the BFP’s through extended performance testing to insure they meet the requirements of the construction documents • 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 • Completed replacement of the rake mechanisms in selected secondary clarifiers C5100 and C5200 • Continue with the yearly sewer maintenance program including lining and spot repairs • McCollister Road extension east of Gilbert Street has been recently completed including sanitary and storm water collection. Collections has inspected and confirms it is complete. Connection to the existing sanitary sewer system is complete • 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 the brick façade that recently failed and top seal for the sludge storage tank 8801 • Initiate a study to determine improvements and replacement of equipment and structures in the digester complex. This study will include development of a phosphorous removal strategy to minimize struvite formation in the digesters that damages piping and Wastewater Debt Service

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