09/02/2008 Council Packet - Laserfiche WebLink

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• • • Portions of the northwestern corner of District 2 cannot be served by gravity sewers connecting to either the existing Main Street trunk sewer or the proposed Century Farms North Lift Station. Two additional lift stations are proposed in this area. One, located near 4th Avenue north of Main Street, will serve Sub - District 2A. This lift station will discharge to the existing gravity sewer in Main Street. The other lift station, located in the northwest corner of the City, will serve Sub - District 21 Currently, developed areas of Sub - District 2I are served by Lift Station 10, discharging into the existing gravity sewer in Sub - District 2E. However, long term development in the northwestern corner of Lino Lakes will eventually result in flow rates that exceed the capacity of the City's existing trunk sewers. A relief sewer will need to be constructed before 2030 to divert some of the flow from the existing system. See discussion of West Side Relief Sewer below. Lift Station No. 4, which receives flow from almost all of District 2, was recently upgraded. This upgrade included provision of 3 -phase power by Xcel Energy, and installation of new 25 HP, 1000 gpm pumps. This upgrade will serve the City's needs for several years, but will not be adequate for ultimate development. Future installation of large pumps, up to 40 HP, will be required to fully utilize the capacity of the 24 -inch pipe leading into the station. Further improvements, necessary to accommodate ultimate development, should be addressed as part of the West Side Relief Sewer development. Other improvements contemplated in District 2 include extension of gravity sewer north along Lake Drive and construction of new lift stations to serve Sub - Districts 2C and 2D. West Side Relief Sewer As discussed above, proposed development in District 2, combined with redevelopment or extension of City Sewer Service to areas not currently sewered, will cause the capacity of the existing 21 -inch and 24 -inch trunk sewers to be exceeded at some point in the future. The exact timing of this need is dependent on the rate at which development proceeds. However, it would appear to be prudent to begin planning for the future construction of a relief sewer. Extensive areas of unsewered residential development exist in the western part of District 2. Construction of the relief sewer should be planned to coincide with extension of sewer service into these areas. The relief sewer project will also require construction of smaller trunk sewers to divert flow from the existing trunk sewer system to the relief sewer. It may be advisable to include reconstruction of Lift Station No. 4 and its forcemain as part of the relief sewer project. A new forcemain could be constructed to outlet into the new relief sewer, thereby eliminating the existing long forcemain and reducing future pumping costs. Sewer District 3 Sewer District 3 is located on the east side of the City, generally east of Centerville. District 3 also includes the Lamotte Drive Area, a fully - developed area of about 40 homes located west of Centerville. Existing sewered areas of District 3 contain about 440 existing single - family residences, and a few commercial properties. The District also includes about 100 un- sewered residences. District 3 contains approximately 247 acres of developable land designated as low density residential; 207 developable acres designated medium density residential; 25 developable acres high density residential; and 302 developable acres designated as mixed use residential. In total, these areas are projected to support approximately 2,610 new residential units. Total residential development in District 3 at ultimate build -out is projected to be approximately 3,150 units. District 3 also includes approximately 104 developable acres designated commercial, 122 acres designated industrial, and 67 acres designated mixed use - commercial. Total new employment in these areas is projected to be approximately 3,890 employees at full development. This area is served by MCES Interceptor 76 -51, a 24 -inch gravity sewer in Cedar Street. This gravity sewer was constructed in 2000 to serve part of Lino Lakes and the City of Centerville. Its capacity is 4.62 MGD, and there is 3.5 MGD of this available for Lino Lakes future use. This is adequate for ultimate development of District 3 and Centerville. Existing sewered development in District 3 includes residential, commercial, and industrial development in Sub - Districts 3A and 3B. Lift Station 7 serves Sub - District 3A, 7 -15