Agenda - Council - 08/12/2019 - Laserfiche WebLink

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Background The existing water supply source for the City of Ramsey's water supply system is the Tunnel City/Wonewoc (TCW) aquifer, formerly known as the Franconia -Ironton -Galesville (FIG) aquifer. Water is drawn from the TCW aquifer through eight (8) groundwater wells, seven (7) of which are currently being utilized to provide potable water. The maximum capacity of the combined municipal wells is 10 9 million gallons per day (MGD). Two additional wells are currently proposed to be constructed in the years 2023 and 2028 to provide adequate capacity to the year 2040 based on projected City growth. The City's groundwater supply wells have historically provided groundwater of good quality and in adequate quantity. However, in 2019 the Minnesota Department of Health informed the City that several of its groundwater supply wells are producing concentrations of manganese that exceed the recommended Secondary Drinking Water Standards. The City does not currently treat its municipal water supply for manganese so as a short-term solution the City immediately started pumping water only from wells with the lowest concentrations of manganese to maintain manganese concentrations below the recommended Secondary Drinking Water Standards. Unfortunately, these wells also produce the highest concentrations of iron, which has resulted in increased complaints of rust -colored water. To properly plan for long-term solutions to reduce manganese and iron concentrations in the municipal water supply system, the City is requesting proposals from qualified consultants for providing professional services as generally identified under the Scope of Services section above, and as further identified under the Specific Requirements section below. Final design work for the centralized water treatment facility, including any pilot testing of preferred treatment processes, will be completed under separate contract following public review of and input on the preliminary design report. Questions regarding this request for proposals shall be directed to City Engineer Bruce Westby at 763-433- 9825 or bwestby@cityoframsey.com. Special Considerations I. Neighboring Property Impacts. The preliminary design report shall explore potential impacts of the facility on neighboring properties due to noise, odors, operating hours, traffic, and any other identified sources of impact, and recommend a process for mitigating any identified impacts during the future final design process. 2. Budget. The preliminary design report shall explore future budget impacts based on estimated construction and operating costs, and shall explore and recommend future water rate revisions as needed to offset estimated budget impacts. 3. Estimated Costs. The preliminary design report shall include estimated construction and operating costs for the groundwater treatment facility over the anticipated life of the facility. Estimated costs shall assume industry standard costs for such a facility, and shall include at least one laboratory/office space, one medium-sized conference room, and one two -bay garage with a storage mezzanine The garage is anticipated to house a portable generator and miscellaneous utility equipment/vehicles, whose costs shall NOT be considered within the cost estimate. 4. Public Education/Engagement Plan. The preliminary design report shall include a public education/engagement plan, which will allow the City to convey the results of preliminary design report and to gather feedback from the public to allow the City to better understand whether some of the preferred treatment processes can/should be omitted from further consideration, such as softening.