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WATER SUPPLY STRATEGIES – NEXT STEPSFEBRUARY 20, 2024  FOCUSENGINEERING, inc.A pilot study is recommended to inform the water treatment plant design parameters and tooptimize the treatment design. The total estimated cost for a pilot study is in the $250,000 to$350,000 range and can take approximately six to nine months to complete.When pretreatment for Fe/Mn is provided, IX media has demonstrated greater treatmentcapacity compared to GAC during pilot studies performed on similar water quality. IX mediatends to have greater efficacy for removing certain PFAS compounds that are present in LakeElmo’s water supply.Assuming an April 16, 2024 design authorization for Well 6 and the South Water TreatmentPlant, the plant will be operational for peak 2027 summer water supply demands. Thisassumes a 36-month design and construction schedule. Depending on the commencement dateof the pilot study, and the initial findings, the completion date for the WTP could be extendedby six to nine months.The opinion of probable cost for the treatment facility is $45M including a20% contingencyand soft costs.FINDINGSSOUTH AREA WATER TREATMENT PLANT (WTP)