03-23-2010 Council Work Session Packet

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CMP Part 4C. Comprehensive Sewer Policv Plan The Orono-Long Lake Interceptor is designed and constructed with sufficient capacity to permit planned development within the urbanized areas of Orono, Long Lake, Minnetonka Beach, and the Morningside area of Medina. The Interceptor was also designed with sufficient capacity to accommodate additional flows from Orono including a number of rural neighborhood clusters where pre- existing residential development required municipal sewer, and to accommodate additional planned urban development in northern Orono primarily along the Highway 12 corridor. However, capacity is not unlimited and is not sufficient to accommodate sewering of all of rural Orono at urban densities. This capacity is consistent with the land use plans of the other chapters of Orono's Community Management Plan. Table 4C-5: Orono's Share of Orono-Long Lake Interceptor Sewer Design Capacity (1980)Versus Year 2030 Projected Demand 1980 Pipe and Pump Design Y'ear 2030 Demand Average Daily Flow Average Daily Flow Projected Sewer Units (cfs) (mgd) Sewered Population Res. Non-Res. Total Res. Non-Res. Total Res. Non-Res. Total Orono Pump Station(LS-59) 1.37 O.13 L�0 0.89 0.08 0.97 397� 16�0 273 1923 L. L. Pump Station (LS-60)* 0.03 0.14 0.17 0.02 0.09 0.11 212� 870 348 1218 Orono Downstream 0.09 ---- 0.09 0.06 ---- 0.06 900 375 47 423 Connections Totals 1.49 0.27 1.76 0.97 0.17 1.14 7000 2895 668 3563 MGY Equivalent 416 356 Source: Adapted from 1980 Orono CD4P based on Cih� of Orono Resolution No. 901 dated 4-]7-78; Addendum \o. 3, Preliminary Engineering Report on Orono-Lon�,Lake Interceptor prepared by McCombs ICnutson Associates for MWCC dated'�ovember 1977 *This 1980 dat�does not account for the flows from the J�laple Plxin Interceptor which had not been constructed as of 1980. Flow�rate used for 1980 data= 1 15 gaUcapita/day and 3.2 persons/household=368 gpd/unit Flow rate used for 2030 data=274 gpd/REC Note:This table does not include flows directly to Wayzata and Plymouth 6. Maple Plain Interceptor The seventh and last municipal sewer plant discharging into Lake Minnetonka was the Maple Plain plant. Maple Plain had been designated as a freestanding growth center in the late 1970's and most of the sewage entering the plant was generated in the Crow River watershed. The Metropolitan Council's 208 Water Quality Study concluded that only minor plant alterations would be necessary to upgrade this plant for satisfactory levels of phosphorus removal. As of 1980, the 208 recommendation, and the accepted plans of Maple Plain, Orono, Medina and the MWCC, all agreed that the then 15 year old idea for a Maple Plain interceptor was no longer necessary and was in fact no longer a valid taxpayer expense. This decision had been reinforced by the final routing of the Orono Long Lake Interceptor and bv the then planned lack of Maple Plain capacity in that Interceptor. City of Orono Community Management Plan 2008-2030 Page 4C-41