03-02-2020 Council Work Session Packet

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Mr. Rick DeGardner February 25, 2020 Page 3 6. Water Distribution System Modeling and Watermain Phasing Plan Preliminary water distribution system modeling has indicated that a centralized water treatment plant could initially treat Wells 1, 3, 5, and 6, and without upsizing the existing 16-inch watermain on Birch Street. The City’s maximum day water demands will eventually exceed the hydraulic capacity of the existing 16-inch watermain on Birch Street. If Wells 2 and 4 are left untreated and used only as peaking wells on maximum day demands, the existing 16-inch watermain should have adequate hydraulic capacity to convey treated water from a centralized water treatment plant for the next 10 to 15 years based on the water demand projections in the City’s Comprehensive Plan. At that time, a parallel 16-inch watermain will need to be constructed along Birch Street and extended westward and eastward in phases as the capacity of the water treatment plant is increased and possibly expanded in the future with new wells pumping to the plant. Constructing a future plant expansion and a parallel 16-inch watermain in phases along Birch Street will be evaluated as part of this study. The raw watermain costs to be constructed from the City’s existing wells to the centralized water treatment plant will also be figured-in to the estimated costs. 7. Study Neighborhood Impacts The preliminary design report will explore potential impacts of the water treatment facility on neighboring properties due to noise, odors, operating hours, traffic, and other identified sources of impact and recommend a process for mitigating any identified impacts during the final design process. Neighborhood meetings are not anticipated for this study phase and not included in this proposal. 8. Determine Estimated Costs The preliminary design report will include estimated construction and operating costs for the groundwater treatment facility over the anticipated life of the facility. Estimated costs will assume industry standard costs for a gravity filtration water treatment plant. In addition, life cycle costs will be prepared for each alternative to provide a complete capital-life cycle cost analysis over a 20 to 30-year planning period. The report will explore future budget impacts based on estimated construction and operating costs and will explore and recommend “order of magnitude” water rate revisions needed to offset future budget impacts to fund the water treatment plant. This analysis does not replace a water rate study that should also be completed under a separate project. 9. Report Preparation The findings, estimated costs, and recommendations from the study will be summarized in a report along with report figures and presented to the City Council. 10. Meetings We will coordinate, prepare handouts, and attend up to four (4) meetings with City staff and three (3) City Council meetings to discuss the report.