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Sanitary sewers are designed to handle daily and seasonal variations in generated wastewater <br />flow. The Appendix also presents wastewater flow variation factors, which increase as average <br />flow decreases. Appendix A-1 presents flow variation factors for sewer design. These factors <br />reflect that sanitary sewers (local and regional) have been designed for average residential, <br />commercial, and industrial flow of 100 gallons per capita per day. Currently actual average flow <br />is approximately 85 gallons per capita per day. To establish infiltration and inflow mitigation <br />goals, the design flow variation factors have been adjusted upward (divided by 0.85), which <br />reflects available capacity for infiltration and inflow. These factors are presented in Appendix A- <br />2. <br />Capital Improvement Plan <br />This section of the system plan presents a capital improvement plan for the 2016- 2040 period. <br />The three objectives of the capital improvement plan are: <br />• Preserve the infrastructure investment through rehabilitation/replacement. Note: <br />Interceptor rehabilitation also reduces inflow and infiltration which recovers system <br />capacity <br />• Strategically expand the system capacity through treatment plant and interceptor <br />expansions and interceptor extensions, and <br />• Improve the quality of service by reusing wastewater, increasing system reliability, and <br />conserving and generating energy <br />Table 4. Sewered Population and Employment Forecasts (thousands) <br />Wastewater Treatment Plant 2010 2040 2010 2040 <br />Pop. Pop. Emp. Emp. <br />Blue Lake <br />269.18 420.69 <br />162.04 245.62 <br />Crow River (Rogers) <br />0.00 15.09 <br />0.00 11.79 <br />Eagles Point <br />68.05 114.13 <br />12.71 26.11 <br />East Bethel <br />0.00 11.45 <br />0.00 1.28 <br />Empire <br />133.33 210.61 <br />35.71 59.36 <br />Hastings <br />22.17 30.10 <br />8.60 11.40 <br />Metropolitan <br />1,778.36 2,227.87 <br />1,054.38 1,391.07 <br />New Germany <br />0.00 1.40 <br />0.00 0.09 <br />St. Croix Valley <br />26.14 32.70 <br />17.64 24.30 <br />Seneca 242.99 292.84 178.38 239.13 <br />Total 2,540.23 3,356.87 1,469.50 2,010.14 <br />37 <br />