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

Home

Our Mistioi}: To work together to reipoiibly grew our comma nityr, and to provide quality, cent-oliBcdwe, and efficient government services. CC Regular Session 7. 6. Meeting Date: 08/12/2019 By: Bruce Westby, Engineering/Public Works Information Title: Adopt Resolution #19-191 Approving Centralized Water Treatment Request for Proposals and Authorizing Solicitation of Proposals Purpose/Background: Purpose: The purpose of this case it to adopt Resolution # 19-191 approving the attached draft Centralized Water Treatment Request for Proposals and authorizing solicitation of proposals. Background: The purpose of the attached Request for Proposals is to allow the City of Ramsey to address various long-term needs related to the City's municipal water supply system. This year the Minnesota Department of Health informed City of Ramsey Staff that several of our 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, at least until heavier irrigation system use causes the City to introduce additional water from other wells. Unfortunately, the wells with the lowest concentrations of manganese also produce the highest concentrations of iron. This has resulted in increased complaints of rust -colored water, and over time will negatively affect the operation of valves, water meters, hydrants, and other mechanical devices susceptible to damage due to higher concentrations of iron. To properly plan for long-term solutions to reduce manganese and iron concentrations in the municipal water supply system, and to properly treat any other emerging contaminants, and to ensure the existing aquifer we use as a groundwater source has adequate capacity to meet the future needs of the City, Staff requests Council authorization to solicit proposals from qualified consultants to provide professional engineering services under the following three general areas. 1. Analyze Source Water. Analyze and report on the overall accessibility, capacity, chemistry and limitations of the Tunnel City/Wonewoc (TCW) aquifer, the existing source water for the City of Ramsey's municipal groundwater supply system, and on the long-term viability of continuing to use the TCW aquifer as the sole source of water for the municipal water supply system. This will allow the selected consultant to adequately prepare a preliminary design report by understanding the chemistry of the municipal groundwater supply system and therefore which primary, secondary and/or emerging contaminants will need to be treated over the anticipated life of the facility. This work will also allow the selected consultant to provide recommendations on the need for and use of alternative sources of water.