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e. Public Sewer Currently, sanitary sewer is available only in two small portions of Lake Elmo (See Map 19). Approximately one square mile located in the southwest corner of Lake Elmo is served by the Metropolitan Waste Control Commission WONE Interceptor. The other system is a privately owned and operated collection system and treatment plant serving Cimarron, a mobile home park, at the intersection of County Roads 70 and 17. The remaining residences and businesses rely on private on -site septic systems, some with joint drainfields designed under the 201 program. The WONE (Woodbury-Oakdale-Northdale-East Oakdale) Interceptor was constructed in 1968 and 1969 to replace several smaller facilities and provide service to projected growth areas. In 1971, the Metropolitan Waste Control Commission (MWCC) purchased this facility and now operates it as part of the Metropolitan sewer system. The function of the WONE is to provide metropolitan interceptor service for designated areas in Woodbury, Oakdale, Landfall, and Section 32 and part of Section 33, in Lake Elmo. The MUSA (Metropolitan Urban Services Area) covers approximately 470 gross acres in Lake Elmo. Only 375 acres in this area are available for development after excluding major right-of-ways, wetlands and a cemetery. A capacity of 458,000 gallons per day, equating to 6,000 population equivalent units of 75 gallons per person, has been reserved in the WONE Interceptor for Lake Elmo's use. Sanitary sewer service has been available since 1969 when the WONE Interceptor was completed. Presently, only two parcels of land in the City are connected to this facility because the sewer was extended only a few hundred feet into Lake Elmo in 1973. Map 11 shows the Metropolitan Urban Service Area (MUSA) line superimposed upon the Land Use Concept Plan for the area. The area within the MUSA line contains approximately 470 gross acres. Of this amount, only 377.5 acres are available for development excluding major rights -of -way and due to the wetlands which must be preserved for drainage control as required by the watershed districts and the drainage plan. A capacity of 458,000 gallons per day, equating to 6,000 population equivalent units of 75 gallons per person, has been reserved in the WONE interceptor for Lake Elmo's use. In 1973, approximately 935 feet of 15" reinforced concrete pipe sewer was constructed from the WONE Interceptor along the I-94 frontage road and into Lake Elmo. This pipe has a flowing full capacity of 2.15 MGD (3.3 cfs). Presently, only the ConnCo Shoe building and a seven unit rental housing tract are utilizing this sewer. This annual sewer flow is presently estimated to be 1.0 MG.