04-04-2022 Council Work Session Packet

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WS-2 WORK SESSION STAFF REPORT Work Session Item No. 2 Date: April 4, 2022 To: City Council From: Michael Grochala, Community Development Director Re: Water Treatment Plant Next Steps Background The water treatment plant feasibility study, completed in June of 2020, recommended the construction of a conventional gravity filtration system that is modified to provide for biological filtration with an initial treatment capacity of approximately 6,000 gallons per minute (gpm). In March of 2022, WSB and Associates presented the results of the Pilot Study, undertaken during the fall of 2021. The study confirmed the effectiveness of biological filtration to meet the treatment goals of the study. Manganese, Iron and Amonia concentrations where reduced to levels below the designated targets. Furthermore, the biological filtration is expected to reduce both chemical and water use when compared to a conventional gravity system without the biological filtration modification. As a result of the study, WSB and Associates have reaffirmed their recommendation to construct a conventional gravity filtration system, modified for biological filtration. The plant would be designed with an initial treatment capacity of 6,000 gpm. This design volume is anticipated the meet the city's needs through 2040. The plant would be designed to accommodate future expansion. If the City Council decides to move forward our next step would be to authorize preparation of plans and specifications. The project schedule is tentatively as follows: Task Date Authorize Preparation of Plans and Specs May 2022 Authorize Land Acquisition June 2022 Approve Plans and Specs Authorize Ad for Bid October 2022 Approve Utility Rate adjustment November 2022 Award Contract November 2022 Complete Construction and start up October 2023