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

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Existing groundwater sources will be routed to the treatment facility. These sources can also be utilized as a backup supply in the case of a disruption in the surface water supply system. 3. Ground Water Source Treatment Treatment of groundwater for iron, manganese and other contaminants is typically accomplished utilizing granular media filtration. Granular media filtration is effective in removing arsenic, radionuclides, iron and manganese. Arsenic and radionuclides are removed through a process known -as co -precipitation with iron and manganese. Iron and manganese are typically removed from water using an oxidation and filtration process. This process uses oxygen (through aeration of the water), or chemical oxidants such as chlorine or potassium permanganate, to oxidize and precipitate the iron and manganese. Once precipitated, the iron and manganese are easily captured and removed using granular media filters. Granular media filters can be either gravity type or pressure type filters. Pressure filtration is not generally utilized for radionuclide contaminant removal due to build up of radon gas in the system. Key components of a ground water treatment facility include the following: • Water transmission mains from well sites • Aeration • Detention tank • Granular media filtration • Clearwell/reservoir storage • High service pumping • Disinfection • Backwash reclaim system 4. Water Treatment Facility Sites Two potential sites for a water treatment facility have been identified. Figure 1 in Appendix C shows the location of these sites. Site A is located on Armstrong Boulevard in the vicinity of Fire Station No. 1. This location was selected due to close proximity to the existing water supply City of Ramsey, Minnesota — R13.104504 Page 23 Comprehensive Water System Study Prepared by Bolton & Menk, Inc.