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y , <br /> Project Understanding & <br /> Approach <br /> Understanding <br /> The City of Lino Lakes is planning to construct a new 8.6 million gallons per day(MGD) iron and manganese Water <br /> Treatment Plant(WTP)to treat Wells 1,3,5,6 and future wells following a traditional design-bid-build method.All four <br /> wells exceed the Minnesota Department of Health's recommended health risk limit(100 ppb)for manganese for infants. <br /> In 2020,the city prepared a Feasibility Study for the purpose of selecting the preferred site, developing the preliminary <br /> design concepts for the WTP including the selection of treatment processes,developing floor and site plans,and <br /> preparing preliminary cost estimates. In 2021,the city completed a biological filtration water treatment pilot study that <br /> successfully treated the iron and manganese in the City's highest producing manganese well without feeding chemicals <br /> The city has requested this proposal from WSB to provide professional engineering services to complete the final <br /> design,to prepare plans and specifications,to assist with bidding the plans and specifications,and to administer and <br /> observe the construction of the proposed WTP. <br /> Water Quality and Treatment <br /> The City of Lino Lakes proposed water treatment plant of replacement parts and materials),the discharge of <br /> will need to provide manganese free water in addition the waste products,and the ability of the plant to be <br /> to removing other secondary contaminants.The design modified in the future.This will be a comprehensive <br /> capacity of the plant should be high enough to meet review during the preliminary design phase and <br /> the city's projected maximum day demands or be recommendation of the best treatment facility to meet <br /> designed to be expanded in the future.The plant should the current and future needs of the city. <br /> be designed to treat iron and manganese biologically <br /> with aeration and gravity filtration in addition to feeding The manganese and iron in the city's well water <br /> chlorine for disinfection,and fluoride for dental care. could be treated without chlorine and potassium <br /> permanganate with biological filtration as successfully <br /> The analysis of the water treatment plant will include,but piloted. In addition,the disinfection byproducts(Total <br /> not be limited to,estimated construction costs,flexibility Trihalomethanes and Total Haloacetic Acids)that are <br /> of the system to treat additional elements as drinking formed in the city's water when chlorine reacts with the <br /> water standards change,water chemistry changes natural organic matter could be totally eliminated with <br /> or demand necessitates,the ability of the system to biological filtration. <br /> effectively and efficiently remove manganese,iron,and <br /> other contaminants from the water supply,ease of the <br /> operation of the system(manpower needed,availability <br /> A Proposal for Design,Bidding,and Construction Administration for a <br /> Water Treatment Plant for City of Lino Lakes Project Understanding&Approach 12 <br />