06-18-07 Item 2D, Comp Plan Update Kickoff

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System Plan Considerations Affecting Your Community I. Metropolitan Sewer Service Forecasts: The forecasts of population, households, employment, and wastewater flows for Arden Hills as contained in the adopted Water Resources Management Policy Plan are listed below. These forecasts are for sewered development. The sewered housing forecasts were estimated based on SAC data, annual city reports, current trends and other information relating to your community. The wastewater flows are based on historical wastewater flow data and the projected sewered housing and employment data. Table I Year 2010 2020 2030 Sewered Population 11,200 13 ,500 22,500 Sewered Households 3,800 4,600 8,000 Sewered Employment 15,200 17,100 20,000 Average Annual Wastewater Flow (MGD) 1.28 1.47 2.26 Allowable Peak Hourly Flow (MGD) 3.84 4.41 6.33 The flow projections represent the Council's commitment to a level of service, assuming that the Council's underlying demographic forecasts are maintained. Adjustments may be required based on verified growth or lack of growth. The city should contact Council staff to discuss any proposed adjustments. Flow projections do not represent an allocation of interceptor capacity except in the event a temporary system constraint occurs. The community must strive to keep its wet weather flows within the allowable peak hourly rate. At a minimum the Council will reevaluate flow projections every five years. Moreover, the Council will also continue to monitor each city's flow on a continuous basis and note any significant changes. The Council will use these growth and wastewater flow forecasts to plan all future interceptors and treatment work needed to serve your community. The Council will not design future interceptor improvements or treatment facilities to handle peak hourly flows in excess of the allowable rate for your city. Arden Hills, through its comprehensive planning process, must decide the location and staging of development, and then plan and design its local wastewater collection system to serve this development. If you plan a total wastewater flow from your community in excess of the Council's forecasts, your assumptions will be analyzed by the Council for their potential adverse effects on the capacity or operation of the metropolitan system. You should also note that urban development at overall densities that are substantially lower than identified for your community in the Council's Growth Management Strategy W- 2