2015-05-05 P & Z Packet - Laserfiche WebLink

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