Agenda - Council - 06/26/2012 - Laserfiche WebLink

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C. WATER TREATMENT ALTERNATIVES 1. General For alternative comparison, water treatment facilities were evaluated for both the surface water sources and ground water sources. Surface water sources are required to provide filtration treatment in addition to disinfection and fluoride addition. This requirement is required due to the variation in water quality typically experienced in surface water sources and the need to remove potential contaminants from the water prior to distribution and consumption. A central water treatment facility for treatment of surface water was evaluated. While groundwater sources currently have water quality which meets safety and regulatory standards, the high levels of iron and manganese will continue to provide a source of consumer concerns. In addition, the construction and maintenance of numerous small chemical treatment facilities at each well site requires a substantial investment in capital, operations, and management resources. Storage of chemicals at numerous sites presents a security and safety challenge regarding public safety. For these reasons, a central water treatment facility was evaluated for groundwater treatment. 2. Surface Water Source Treatment Treatment for surface water sources can be accomplished utilizing either ultra filtration membrane processes, lime softening systems, or granular media filtration. Based on the findings summarized in the 2008 Water Supply and Evaluation Report, the key components of a surface water treatment facility include the following: • River intake / pumping station • Raw water transmission main • Surface water detention basin • Clarification • Membrane filtration • Clearwell / Reservoir storage • Disinfection • High service pumping • Wash water reclamation system City of Ramsey, Minnesota — R13.104504 Page 4-3 Comprehensive Water System Study Prepared by Bolton & Menk, Inc.