Agenda - Council - 12/12/2017 - Laserfiche WebLink

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2. Pre-treatment of the water from the Mississippi River will be required to remove grit, sand and organics prior to the filtration process. 3. Conventional treatment with ultra -filtration membranes will provide water which meets State and Federal Drinking Water Standards. Based on the results of the pilot testing program, treatment of this source will be evaluated, with a groundwater source backup based on the current well system. Two potential locations have been identified for a surface water intake on the Mississippi River. Locations for these intakes are shown on Figure 1, located in Appendix C. Figure 1 also shows the proposed routing of the 30" raw water transmission main from the intake structure to the water treatment plant site for each option. 2. Ground Water Sources As discussed in previous sections, the City currently obtains drinking water from the Ironton -Galesville aquifer system. This system is utilized extensively by surrounding communities. Minnesota Department of Natural Resources (MnDNR) staff is currently exploring ways to manage this resource in the region, and have requested that Ramsey look into alternate water sources, specifically surface water sources. In addition, the City Ramsey agreed to establish an aquifer monitoring program in order to collect data regarding the impact of water withdrawal from the Ironton -Galesville aquifer. The City currently has monitoring wells and is working with the DNR to determine the interaction between the surface water and groundwater. Based on the DNR's historical data, the potential of the Ironton -Galesville aquifer system to provide water to meet future development needs is questionable. In order to deteiririne whether the aquifer would support future development, the City of Ramsey would need to undertake an exploratory hydrogeologic study of the area. This study would include the following: 1. Determine potential sites for additional wells based on land availability, proximity to the existing and planned water utility infrastructure, and potential for developing an economically viable water supply at the proposed site. City of Ramsey, Minnesota — R13.104504 Page 20 Comprehensive Water System Study Prepared by Bolton & Menk, Inc.