Agenda - Council Work Session - 10/20/2020 - Special

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8 9 10 Lamella plate settlers waste between 60 and 900 gallons per million gallons of water treated, depending upon whether a sludge holding tank is utilized. Backwash tanks waste between 750 and 5,000 gallons of water per million gallons of water treated, Because lamella plate settlers provide significantly more operational flexibility and waste less water, lamella plate settlers are recommended for Ramsey. Architectural Design The City of Ramsey's goal for the water treatment facility is to provide a building that fits with the adjacent fire station, includes cost effective sustainable design features, is operator friendly, and provides a civic presence to the public. The water treatment functions of the building will be constructed of poured in -place concrete foundations with masonry, brick, and stone facade. A glass atrium will be provided as an architectural feature and to provide additional natural light. Architectural features from the adjacent fire station were incorporated into the design. For walls that are less visible to the public, cost-effective insulated load bearing precast wall panels will be use. The roof will constructed of precast concrete double 'Ts for the roof structure of the filter room which allows for a greater clear spans and more daylighting. Sustainable architectural features will include natural daylighting throughout including the filter room, low maintenance poured -in -place and plant precast concrete structure and wall panels, building insulation which surpasses the current energy code. Rain gardens and low maintenance landscaping features can be included in the site design. An architectural rendering that further demonstrates the design concept of Alternative 1 is ncluded in Appendix H. Utility Space Needs Evaluation City staff was solicited for additional space needs and features in the water treatment plant building in addition to the necessary filters and process rooms. The additional features requested in the building included a training room, and a separate laboratory_ An optional 8,000 square foot garage is also included in the building layouts. Water Treatment Plant Site Alternatives and Evaluation Three alternatives for a new water treatment plant site were provided by the City. These alternatives include the Fire Station Site, Public Works Site, and Vacant City Property Site. These sites are shown on Figure 1 in Appendix I. These site are discussed below. Bunker Lake Boulevard is scheduled to have a full -depth reconstruction in the summer of 2022. The costs in the following sections assume that the watermain in Bunker Lake Boulevard is constructed during the road construction. The remaining waterrnain is assumed to be constructed in the boulevard or under trails and no road reconstruction is assumed, FEASIBILITY STUDY -DRAFT RAMSY 154354 Page 33