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Executive Summary (continued) <br />In addition to having lower life cycle costs, gravity filters have other advantages over pressure filters <br />including: (1) more treatment options including aeration and detention without requiring another <br />pumping step, (2) water from the gravity filters does not go immediately into the distribution system so <br />if problems occur with treatment processes operators have time to react, (3) gravity filters are open to <br />view and access, and (4) gravity filtration systems have a greater amount of operational flexibility <br />including the ability to treat surface water. <br />A gravity filter treatment plant is the recommended alternative due to the advantages it offers at a <br />comparable cost. <br />If the City elects to proceed with a water treatment plant project, the proposed project schedule could <br />be as follows: <br />Item Completion Date <br />Public Involvement March 2021 — April 2021 <br />Preparation of Plans May 2021 — September 2021 <br />Ad for Bid October 2021 <br />Bid Opening November 2021 <br />Construction Start December 2021 <br />Construction Complete June 2023 <br />However, Anoka County is planning "interim" improvements to Bunker Lake Boulevard between <br />Armstrong Boulevard and Sunfish Lake Boulevard in 2021 to improve operations and safety in <br />anticipation of traffic volumes doubling while planned improvements to Highway 10 are constructed <br />between 2022 and 2025. Therefore, to construct the raw and finished watermain associated with the <br />water treatment plant project as cost-effectively as possible, plans and specifications for the raw and <br />finished watermain improvements are recommended to be prepared and bid in conjunction with <br />Anoka County's proposed improvements to Bunker Lake Boulevard. <br />Operating the water treatment plant is not anticipated to require additional Staff. While Staff will need <br />to visit the plant on a daily basis to operate and maintain it, this time will generally be offset by the <br />time Staff currently spends operating and maintaining the six municipal wells and three pump houses <br />within The COR. <br />If a water treatment plant project is pursued, immediate distribution water quality improvements <br />should not be expected. The water treatment plant will produce water free of iron and manganese; <br />however, it takes time for the iron and manganese deposits in the distribution system to dissipate and <br />overall water quality to improve. <br />FEASIBILITY STUDY - DRAFT RAMSY 154354 <br />ES-2 <br />