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

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Cost for these improvements would be offset by savings realized by utilizing a site already owned by the City rather than purchasing property as required at Site A. Further evaluation of site locations will be required during pre -design phases of the water treatment facility project implementation. D. ALTERNATIVE COMPARISONS Cost estimates for two (2) alternatives were developed for implementing the Water Supply and Treatment required to meet the City of Ramsey's water supply demands. For each alternative, the following assumptions were utilized: 1. New water supply and treatment facilities will need to be on-line by 2019. 2. Treatment facilities will be constructed in phases to meet the demand requirements. During final design, a Value Engineering phase should be utilized to determine the most cost effective phasing of the treatment facilities. 3. Provisions will be incorporated into final design for routing of groundwater sources directly to the clearwell high service pumping facilities. With this provision, up to 20 percent of the water demand will be met with ground water. The groundwater supply would by-pass the water treatment facility and would be blended with treated water prior to being pumped to the distribution system. The amount of ground water which can be blended with the treated water is determined based on meeting water quality standards for iron, manganese and hardness. The disadvantage to this system is the impact of the blending water on water quality. This may be mitigated by blending water under all water demand conditions. The advantage of this system is the water treatment facilities can be designed with a lower capacity, thus reducing capital investment. Evaluation of the impact of this process will be conducted during final design. Alternative 1: Surface Water Supply. With this alternative, the following key improvements are required. Phase 1.- Construct a 9.6 mgd surface water treatment facility. Facility will need to be on-line by 2019 to meet community water demands. Estimated cost: $32,000,000. Phase 2 - Construct 2.4 mgd surface water treatment facility expansion. Expanded capacity required by 2025 to meet community water demand. Facility includes additional membrane filters, chemical feed and clarification facilities. Estimated Cost: $4,250,000. City of Ramsey, Minnesota — R13.104504 Page 4-6 Comprehensive Water System Study Prepared by Bolton & Menk, Inc.