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Table 7 - Projected Wastewater Flows (2007 - 20301 <br />Year <br />2007 <br />2010 <br />2015 <br />2020 <br />2025 <br />2030 <br />Sewered <br />Population <br />125 <br />154 <br />301 <br />448 <br />492 <br />536 <br />Sewered <br />Households <br />50 <br />70 <br />137 <br />203 <br />343 <br />482 <br />Sewered <br />Employment <br />548 <br />720 <br />780 <br />840 <br />855 <br />870 <br />Average Annual <br />Wastewater <br />0.055 <br />0.073 <br />0.096 <br />0.12 <br />0.16 <br />0.198 <br />Flow (MGD) <br />Allowable Peak <br />Hourly Flow <br />0.22 <br />.029 <br />0.38 <br />0.48 <br />0.64 <br />0.79 <br />(MGD) <br />--rtows determined as follows: 75ga1/day Pierson population, 25ga1/day person employment & 600ga1/day-acre <br />commercial <br />Existing & Potential Sanitary Sewer Related Issues <br />To continue with the `rustic' feeling of the City in a natural environment and to <br />maintain the low -density development desired, the following shall be considered the <br />goals of the City of Gem Lake sanitary sewer plan: <br />• Zoning and lot sizes will be regulated to allow adequate space for onsite septic <br />systems in residential areas. Current rules require adequate space for a second drain <br />field on each residential tract, in case the first one fails. <br />• All onsite septic systems in the City are inspected bi-annually to insure the correct <br />operation of these systems. Inspections are performed by the City's contracted <br />inspector. <br />• A backup plan for providing a City operated sanitary sewer system has been <br />developed and will be put in place if necessary in any area of the City where onsite <br />septic systems cannot operate. <br />Within these goals the following specific items have been implemented: <br />• City-wide Sanitary Sewer System Plan was developed for the City in May 2007. This <br />plan provides for a potential municipal sanitary sewer connection for each part of <br />the City that could possibly use gravity flow sewer. This plan does require extensive <br />excavation and construction through some of the areas of the City. <br />Figure 7 - Sanitary Sewer Comprehensive Plan. illustrates possible extensions to the sanitary <br />sewer system of Gem Lake. Any expansions to the system would be connected to either <br />the Vadnais Heights system or the MCES belt line interceptors. The average daily flow. <br />of the existing connections to the public system is 0.027 MGD or 10 million gallons <br />per year based in the Met Council's current billing. With the future possible <br />extensions, the ultimate daily flow would be 0.239 MGD or 87.4 million gallons per <br />year. Table 7.1 - Estimated Future Sewer Flows illustrates estimated future sewer flows <br />based on the City's proposed zoning and land use. The anticipated flows from the <br />various sewer districts were determined by applying typical flow rates. For residential <br />areas a flow rate of 275 gallons per day per residential unit was used. For the <br />commercial / industrial areas a flow rate of 600 gallons per day per acre was used. <br />7.0 sanitary sewer system plan I page 43 <br />