08-22-2022 City Council Packet - Laserfiche WebLink

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Biological 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 treating these (and other) contaminants. The cities of Minneapolis, St. Paul, and St. Cloud are now utilizing biological filtration at their water treatment plants. The benefits of biological filtration include higher filtration rates, longer filter runs (reduces backwash supply and wastewater volumes), savings in chemical costs, and reduction in disinfection byproducts. The design of a conventional gravity filtration process with detention and aeration can easily accommodate biological filtration. OTHER DESIGN CONSIDERATIONS WILL INCLUDE THE FOLLOWING: Design for the proper size of clearwell to store treated water and backwash tanks including provisions for water overflow and discharge from backwash tanks: The proposed water treatment facility site will require an efficient footprint to save space and reduce unnecessary costs. If requested by the city, we will study an innovative design for this site that could significantly reduce the building footprint. The plant could be designed with a clearwell that is located directly below the gravity filters which would significantly reduce the footprint of the facility and the cost of the plant structure. Funding The ability for the plant to operate in parallel (one half of the facility under repair or maintenance while the other half maintains operation): The plant should be designed with individual filter cells that can be removed from service and a split clearwell tank (wall down the middle) and high service pumps to meet this requirement. Architectural features in the facility design: Office space/control room, access for chemical delivery, parking for staff and visitors, laboratory facilities, landscaping around the site, storage room (for meters, meter parts, compressor parts, water sample supplies, and water plant parts), and a garage for city maintenance vehicles and/or other large pieces of equipment. New 24-inch and 20-inch diameter raw watermains will be constructed on Birch Street to convey raw water from Wells 1, 3, 5, and 6 to the new water treatment plant site: New transmission mains will also be constructed to pump the treated water from a new finished water clearwell into the city's water distribution system. To properly size the high service pumps, WSB will use the city's existing water distribution system model to model the expected discharge pressures in the distribution system with the pumps operating at minimum to maximum capacity. Obtaining funding for this large infrastructure project will be one of the most important work tasks for this project. WSB has evaluated and applied for funding from various funding sources such as federal earmarks, the bonding bill, and the PFA Drinking Water Revolving Fund (DWRF). Our team has extensive experience in preparing and submitting bonding bill and federal earmarks applications for proposed water treatment facilities. WSB has experience administering PFA funded projects through the Drinking Water Revolving Fund Program from previous water treatment facility projects. A Proposal for Design, Bidding, and Construction Administration for a Water Treatment Plant for City of Lino Lakes Project Understanding & Approach 3