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2. Water Treatment Infrastructure Needs <br />All current water sources for the City of Ramsey exceed recommended levels for <br />iron and manganese. As the city's population continues to grow, it is anticipated <br />that there will be increasing demand for improved water quality regarding iron <br />and manganese levels. <br />The current treatment utilizing polyphosphates for sequestering of iron and <br />manganese does mitigate some of the impact of these contaminants on customers; <br />however, sequestering does not remove iron and manganese, and over time, a <br />certain amount of iron and manganese deposits in the distribution system, thus <br />adding to maintenance costs of the system. Due to significant increases in the <br />water supply demands, and the unknown quantity of groundwater that can be <br />pumped from the Ironton -Galesville formation, surface water sources will need to <br />be considered to meet the City's water needs. A water treatment facility would be <br />required to treat surface water sources. Due to the number of wells which would <br />be required to meet the future system supply needs, the current system of multiple <br />chemical feed points may result in water quality inconsistency across the system. <br />Also, multiple feed points will represent a substantial security risk to the system. <br />Construction of a treatment facility will be considered in Section 4 — Water <br />Supply and Treatment. <br />D. STORAGE <br />1. Existing Water Storage Facilities <br />Existing storage facilities in the City of Ramsey consist of three (3) elevated <br />water towers as shown in Table 3.3. <br />Table 3.3 <br />Existing Storage Facilities <br />City of Ramsey, Minnesota <br />Tower No.1 Tower No. 2 Tower No. 3 <br />Capacity (gallons) 500,000 1,500,000 2,000,000 <br />Year Constructed 1989 2000 2010 <br />High Water Level 1036 1035 1036 <br />The principal purpose of storage is to provide the ability to equalize pumping <br />rates during periods of variable rate of demand. Adequate storage permits a <br />City of Ramsey, Minnesota — R13.104504 Page 3-5 <br />Comprehensive Water System Study Prepared by Bolton & Menk, Inc. <br />