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CMP Part 4C. Water Supply <br /> The total well capacity is determined as the total capacity of all wells operating for 20 hours <br /> per day. It is considered good practice to allow the well pumps a few hours of down time <br /> to "rest", which ultimately extends the life of the pumps and allows for aquifer recharge. <br /> The firm capacity is the total capacity with the single largest pump out of service and is <br /> determined for a pumping period of 20 hours per day. Regulatory agencies recommend <br /> the firm capacity be equal to or greater than the average day demand it serves. <br /> Water Treatment <br /> Treatment of source water for the Navarre Water System consists of sand filtration for iron <br /> and manganese removal, ion exchange softening to reduce hardness,and chemical addition <br /> prior to entry into the distribution system. Fluoride is added for dental cavity protection, <br /> chlorine is added for disinfection, and polyphosphate is added as a corrosion inhibitor. <br /> Treatment of source water for the Highway 12 system consists of chemical addition of <br /> chlorine and fluorides, and polyphosphate is added as a corrosion inhibitor. <br /> Water Storage <br /> The existing storage facilities in the City of Orono consist of one 200,000-gallon elevated <br /> water tower in the Navarre Water System and one 400,000-gallon elevated water tower in <br /> the Highway 12 Water System. Details of the water storage tower are presented in <br /> Table 4C-2. <br /> Table 4C-2: Existing Storage sAila <br /> Navarre Highway 12 <br /> Water Water Tower <br /> Tower <br /> Capacity (gallons) 200,000 400,000 <br /> Year Constructed 1971 1993 <br /> High Water Level 1,102 1,165 <br /> Support Type Multi- Hydropillar <br /> legged <br /> Water Distribution System <br /> The Orono water system is comprised of water mains ranging in size from 6 inches to 16 <br /> inches in diameter. As previously discussed, both the Navarre and Highway 12 service <br /> areas include groundwater wells and elevated storage. The Wayzata System Extension and <br /> Long Lake System Extension are supplied with water directly from the other two Cities' <br /> water systems and only provide a means of distribution to the customers. The existing <br /> capacities of the systems appear to be adequate in regards to pressure and available fire <br /> flow. Future improvements to provide service to planned expansion areas as well as <br /> increased supply capacities are discussed later in this report. <br /> City of Orono Community Management Plan 2020-2040 Part 4C, Page 3 <br />