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prevention of tooth decay. Polyphosphate is added to prevent the precipitation of iron <br />and, to a lesser extent, manganese primarily for aesthetic purposes, such as color, and to <br />prevent the staining of plumbing fixtures and laundry. <br />Water Distribution. The City's water distribution system is comprised of 6-, 8-, 10-, 12- <br />and 16-inch ductile iron pipe. The system includes various necessary appurtenances such <br />as isolation valves, altitude/pressure valves, and fire hydrants. In 1999, the distribution <br />system was analyzed by Bolton and Menk, Inc., using the CYBERNET Hydraulic <br />Network Model. Results of the model indicated that the system functions well by <br />meeting demand for the existing uses. <br />Computer modeling and analysis of future expansions to the distribution network, <br />including the RTC development, should be performed at the time of design to ensure <br />there is no impact on the existing users. <br />Projected Future Water Demands <br />Flow Projections. Development of the RTC site and the remaining areas within the <br />Urban Growth Boundary will result in an increased demand on the existing water system. <br />Projections for the additional demands will be developed in this section in an effort to <br />quantify the potential impacts on the existing water system infrastructure, ground water <br />resources and other related resources. <br />Projections of future demands from the RTC site will be based on the latest Design <br />Concept Plan (February 15, 2003, as shown in Figure 6.1). Projections for demands from <br />additional growth in areas within the Urban Growth Boundary will be based on <br />information contained in the 2001 Comprehensive Plan, as amended in 2002. <br />Table 13.6: Projected Water Usage for RTC Sub -district Residential Development <br />Development <br />Type <br />Quantity <br />Occupants <br />per Unit <br />Total <br />Occupants <br />Usage per <br />Occupant(1) <br />(gpd) <br />Total <br />Usage <br />(gpd) <br />Mixed Use <br />Residential <br />1012 <br />5 <br />5,060 <br />120 <br />607,200 <br />Apartment <br />172 <br />3 <br />516 <br />120 <br />61,920 <br />Duplex <br />62 <br />4 <br />186 <br />120 <br />22,320 <br />Townhouse <br />1154 <br />4 <br />4,616 <br />120 <br />553,920 <br />Total Residential <br />2,400 <br />10,378 <br />120 <br />1,245,360 <br />(1) Per capita usage based on historic average annual usage for existing Ramsey residents; <br />includes only residential use <br />13-5 <br />