09-23-1997 Public Hearing Packet

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GlTYof ORONO Municipal Oflkcs StTMt Address: 2750 Kelley Parkway Orono, MN 55356 MaHlaf Address: P.O. Box 66 Crystal Bay, MN 55323-0066 September 9,1997 To: Project Area Residents; Subject: Navarre Water Treatment Plant Rehabilitation The Orono City Council will hold a public hearing at 6:30 P.M. Tuesday September 23,1997 in the Orono High School Cafeteria at 795 Old Crystal Bay Road North to consider the rehabilitation of the Navarre Water Treatment Plant. Project Description This plant provides Iron and Manganese removal filtration and softening for the Navarre water system. The plant was originally constructed in 1971 and requires a major rehabilitation for continued effective operation. The existing control systems and the filter media in the plant are past their usable service life which has resulted in inconsistent water quality. One of the three softening units is currently not operating because of corrosion problems. The existing ground water supply exceeds the recommended secondary drinking water standards for concentrations of both Iron and Manganese, and the water supply hardness levels are above desirable standards. Rehabilitation and continued operation of this water treatment plant w ill provide for a long term consistently high quality water supply. Discontinuing operation of the plant will result in poor quality water that will exceed recommended standards. The high levels of Iron and Manganese in the raw water supply will cause discoloration, taste, and odor problems. Excessive levels of Manganese also causes deposit build up that reduces the capacity of the water supply pipes. The excessive hardness levels cause the build up of calcium deposits in the supply system and plumbing fixtures, and result in less effective operation of home appliances. Project Funding The sources of funding for the w-ater plant rehabilitation are as follows; TdcpiMMie (612) 473-7357 • FAX 473-0510 artMun. mm *--------------------■ ■ V niiAilfllinii-ih