03-16-1978 Council Minutes - Laserfiche WebLink

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�� i'J `'i, '`n ( � � � �� t � .� .�: �_ G � L5 Page 59 • ' ` ':-1,or F'rad �'an '��st � � „�::i-, 8, 1978 `°�_ _ , � __ _._. _ ��c�� i�,�o . . � - -=t� ,lE i� f t1�"1 �''� y'.�s�.+�t'4`.f pe.r da�• oi do-�st�c s�w�r flow. Orono's ind�.�striallflow in 1976 of .O1 miliion �allons per ca} ;:as acccd to the estir.ated I°90. do-,estic tlew ior the total .58 million €allons per c.a}�. This is an opti�aistic esti�nate of the maxirnum flow from Orono tl-sat could be accozr�modated by tl;e r��etropolitan 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 ray be a problem acco,�modating the e�cess flow i.n the metro sew�r system, �nd the Blue Lake Treatment Plant m,ay need upgrading sooner than planned. In effect, the 1°90 se�aer fl ow estirnate represents the maxir.,um flow that the ruetro s�_c:er s�•stem will be able to acco,-rcnodate from Orono in 1°90. A lesser flow is acceptable from a sewer planning standpoint, but a greater flow could be a problem wnich should be discussed with Council and 4�'aste Control Cor-��nission staff as 2arly in your pl:nnir.g process as pcssible. The plans and specifications for the Orono portions of rne Orono-Long Lake In- terceptor are discussed in a letter dated PSarch 1 , from Bernie Harrington of the j,'aste Control CoIIuz�ission. It answers your questions about design capacities and service areas. As you know, one of the purpeses 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 be necessary to plan for local growth beyond then. Pl�nning beyond 1990 is not required by the Land Planning Act, but it is permissable. The Council and k'aste Control Cormission 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 determir.ations 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 abilit3� of the metro systems to provide the de�ired 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 eaplain here. �'hen you need to get into the details of the r�odel, please contact Steve Alderson (291-6337) of the transportation staff with your questior.s. What the model does in essence is convert demographic forecast data into a number of trips generated, ��d the trips are then assigned to the Council's planned 1990