2022-091 Council Resolution - Laserfiche WebLink

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REVIEW OF EXISTING SITES AND The city's existing wells produce high concentrations INFRASTRUCTURE of manganese.The manganese concentrations The WSB team will visit the proposed water treatment range from 0.152 to 0.383 mg/L in the City's highest plant site and review the existing as-built drawings, manganese producing well.The highest manganese easements, and existing infrastructure in extensive concentrations are over seven times the recommended detail. Potential contaminants and other barriers that secondary standard (0.05 mg/L)for manganese. More may restrict or affect the layout of the plant at the site importantly, all four of Wells 1, 3,5,and 6 exceed MDH's will be evaluated up front during this analysis. recommended guidance level of 100 micrograms per liter of manganese for infants. Other factors such as ease of chemical deliveries, access for maintenance trucks,security,stormwater The iron, manganese,and ammonia in the City's well retention, proximity to water and sanitary sewer utilities, Water could be treated without chlorine and potassium and proximity to three phase-480 volt electrical power permanganate with biological filtration. Biological will be evaluated during the preliminary design phase. filtration is commonly practiced in the United States and Europe and is endorsed by the Minnesota Department of Health (MDH)as an efficient and effective method for REVIEW OF TREATMENT TECHNOLOGIES treating these(and other)contaminants. AND TOURS OF EXISTING WATER TREATMENT FACILITIES The benefits of biological filtration include higher Potential treatment methods and technologies to filtration rates, longer filter runs(reduces backwash treat the city's existing and future wells will be studied supply and wastewater volumes),savings in chemical in detail.The WSB team will analyze the treatment costs,and reduction in disinfection byproducts.The technologies identified in the feasibility study report design of a conventional gravity filtration process and other technologies to make certain that the city with detention and aeration can easily accommodate receives the most current,advanced,and cost effective biological filtration. treatment technology available. If requested by the city,WSB will coordinate and attend additional tours of existing water treatment facilities that utilize each of the treatment methods being evaluated so that city staff have a clear understanding of the treatment technologies and options that are available for the Water Treatment Plant.The analysis will include, but not be limited to, initial construction costs, long term operational costs,flexibility of each system to treat additional elements as standards change,water chemistry changes or demand necessitates,the ability of each system to effectively and efficiently remove iron, manganese and other contaminants from the water supply, ease of operation of each system(manpower needed, availability of replacement parts and materials, etc.),the discharge of the waste product,and ability of the plant to expand or be modified in the future.This will be a comprehensive review and recommendation on the"best" plant to meet the current and future needs of the city. A Proposal for Design,Bidding,and Construction Administration for a Water Treatment Plant for City of Lino Lakes Project Understanding&Approach 7