05-11-1978 Council Minutes - Laserfiche WebLink

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� Page 29 METROPOLITAN COUNCIL . Suite 300 Metro Square Building, St.Paul, Minnesota 55101 I E M O R A N D U M April 11, 1978 TO: Physical Development Co�nittee FROM: Environmental Planning Division Staff (Rarl Burandt) SUBJECT: Orono-Long Lake Interceptor Plans and Specifications Review; Project No. 71-13. Metropolitan Council Referral File No. 5341, Council District No. 16. INTRODUCTION The Orono-Long Lake Interceptor is designed to phase out the Orono and the Long Lake sewage treatment works which indirectly discharge sewage effluent into Lake Minnetonka. In about 1965, Lake Minnetonka began to experience extreme water quality problems and the Southwest Sanitary Sewer District was formed to solve this problem. The most urgent need for cleaning up Lake Minnetonka was the removal of nutrient discharges to the lake. This was accomplished by phasing out numerous on-site sewage systems and four sewage treatment plants discharging to Lake Minnetonka and directing this sewage to the Blue Lake Sewage Treatment Plant with effluent discharge to the Minnesota River. There are two quite large sewage treatment plants still discharging their effluent indir- ectly to Lake Minnetonka; these two are the Orono and Long Lake Sewage Treatment Plants. The proposed project is to consist of a pumping station and a 16" and 18" forcemain from each of these treatlnent plants to a common 20" diameter forcemain which will discharge to a Metropolitan Interceptor at Wayzata which received service from the Blue Lake Sewage Treat- ment Plant. " PROJECT DESCRIPTION The project is eligible for full federal and state funding if minimum federal design stan- l dards are met. A forcemain/pump station facility is to have a life span of 25 to 35 years i according to federal standards. The plans and specifications do meet these standards. ( he system is to be constructed to meet anticipated 1990 sewage flow projections from these - _wo sewage treatment plants plus miscellaneous small pumping station connections along the forcemain as needed. The system has reserve capacity available at the pumping stations consisting of one extra �. pump in addition to the current installation of two pumps at each MWCC pumping station. In this manner, current capacity for growth to 1990 and somewhat more is provided for and pos- sible reserve capacity for expanded future use is also provided for to meet federal grant requirements. The plans and specifications as submitted are consistent with the Waste Management Policy Plan and the approved MWCC Development Program, are eligible for full federal and state grant funding and are approved in the 1977 and 1978 Capital Budget. ^hc City of Orono �•�ill c�nnlete an intcrim Comprchensivc Sewcr ^lan icicntifyinq the �ewcr service area set forth on the sewer service map data March 17, 1978, as an interim local � sewer service area covering the time period between now and 1980, or whenever the Land Planning Act comprehensive plan is prepared by Orono and approved by the Metropolitan Council, whichever occurs first. The interceptor is designed for more flow than what Orono plans they will need by 1980, but this is for sound economic, engineering and grant requirements xeasons_ The reserve capacity in this interceptor is not expected to be used by 1960. Rate of usage of reserve capacity, area of service, timing and other planning details will be determined by local plans, using the design assumptions as ultimate constraints. CONCLUSIONS The Orono-Long Lake Interceptor consists of two pumping stations, 16", 18" and 20" force- main connecting to the Wayzata Interceptor which receives service from the Blue Lake Sewage Treatlnent Plant and discharges effluent to the Minnesota River. The facility is eligible for full federal and state grant funding provided it meets federal design standards of 25 to 35 years life span design. � ''he capacity of the system is designed to meet Council's 1990 growth projections and the ,unping stations have pump and motor foundations for additional future facilities to meet =ederal design standards. The extent of the facility area of service is to be considered at the time or after Orono has submitted their comprehensive plan in accordance with the Land Planning Act so a deter- mination can be made as to how Orono plans to deal with their rural area and to what extent sewer service until 1990 and the entire design period is needed. •