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D" Mayor Brad Van Nest Uj 98909 March 8 1978 13 1?78 Page Two r,!� Y11_LAG19 03 ORORQ •per day of domestic sewer flow. Orono's industrial flow in 1976 of .01 million gallons per day was added to the estimated 1990..domestic flow for the.total .58 million gallons per day. This is an optimistic estimate of the maximum flow from Orono that could be accommodated by the metropolitan sewer system in 1990. If the City produces less flow, then it will have unused reserve capacity available. If the City exceeds the 1990 flow, then there may be a problem accommodating the excess flow in the metro sewer system, and the Blue Lake Treatment Plant may need upgrading sooner than planned. In effect, the 1990 sewer flow estimate represents the maximum flow that the metro sewer system will be able to accommodate from Orono in 1990. A lesser flow is acceptable from a sewer planning standpoint, but a greater flow could be a problem which should be discussed with Council and Waste Control Commission staff as early in your planning process as possible. The plans and specifications for the Orono portions of the Orono -Long Lake In- terceptor are discussed in a letter dated March 1, from Bernie Harrington of the Waste Control Commission. It answers your questions about design capacities and service areas.- As reas. As you know, one of the purposes of the Land Planning Act is to establish local staged growth plans to 1990 consistent with regional needs, plans, and policies. Yet for economic and engineering reasons and to meet federal and state funding criteria, many metro facilities are designed for useful lives beyond 1990. Although the immediate task is to stage comprehensive plans to 1990, at some point it will t •be necessary to plan for local growth beyond then. Planning.beyond 1990 is not required by the Land Planning Act, but it is permissable. The Council and Waste Control Commission assume sewer flows after 1990 will come from beyond Orono's 1990 sewer area but within the area shown on the map accom- panying Mr. Harrington's letter. Areas of service and rates of usage depend on local determinations such as land use densities, local service timing and staging, and other similar factors established through local comprehensive -plans. The factors which determine sewer flows and service areas are established by each city as discretionary development controls. Thus, the metro sewer system is planned using assumptions about ultimate design flows and service areas, but its usage can be modified, staged, and controlled by local plans. Interceptor designs do not necessarily relate to treatment plant capacity, nor do they necessarily take into account other matters which affect actual available capacity. Metro systems statement sewer capacities should serve as the basic building block for local determinations, not interceptor design capacities. The Land Planning Act requires you to state the City's policies on matters contained in Orono's system statement so that the Council can evaluate the ability of the metro systems to provide the desired service and the effects of Orono's plans on others. Turning to travel forecasts, the attached figure shows the generalized process Council staff followed. The process uses a very complicated computer model which I cannot even attempt to explain here. When you need to get into the details of the model, please contact Steve Alderson (291-6337) of the transportation staff with your questions. What the model does in essence is convert demographic forecast data into a number of trips generated, and the trips are then assigned to the Council's planned 1990