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Metropolitan Waste Control Commission <br />350 'Metro Square Building, 7th and Robert. St. Paul. Minnesota 55101 <br />612 222-8423 <br />March 14, 1988 <br />Mr. Mark Bernhardson <br />Administrator <br />City of Orono <br />Box 66, Crystal Bay <br />Orono, MN 55323 <br />Dear Mr. Bernhardson: <br />This letter is a followup to your meeting March 2, 1988 with <br />staff members of the Metropolitan Council and the Metropolitan <br />Waste Control Commission regarding the available capacity in the <br />Long Lake interceptor for the City of Orono. <br />It is the Commission's understanding that there is remaining capa- <br />city in the Orono -Long Lake -Medina trunk sewer to allow for the <br />development of 116 residential equivalent units from the City of <br />Orono. It is also our understanding that the proposed Highway 12 <br />Corridor development and trunk sewer improvements will provide <br />additional capacity for approximately 500 residential equivalent <br />units, some of which may be allocated to Long Lake. <br />During our meeting it was indicated that the Commission's <br />Engineering Department had jusr finished a report on the up- <br />grading of the Long Lake lift station. The results of the report <br />indicate that with the addition of a third pump, the Commission <br />can increase the pumping capacity of the station to 2750 gpm or an <br />average flow of 1.32 mgd. This is very cicge to the total allo- <br />cated capacity of 1.39 mgd for the Long Lake -Maple Plain sevice <br />areas. The report alto indicated that the lift station capacity <br />could be further increased by changing the size of the impellers, <br />altering the piping arrangements within the lift station and <br />adding larger pump motors. <br />The study did not review the impact toat vhese further modifica- <br />tions to the Long Lake lift station would have on the Orono lift <br />station-forcemain system. However, it would appear that there is <br />sufficient capacity available for your ptoDosed development with- <br />out a major improvement being required. <br />Tho Commission will notify the Metrorolitan Council that with the <br />addition of the third pump to the 'lift station the c.ommiss.on will <br />have sufficient capacity to prc4ide for your proposed development <br />and still be able to t)ravide '_he currently allocated capacity to <br />upstream communities at costs to the commission. <br />/ f <br />years <br />