08-14-2000 Council Packet - Laserfiche WebLink

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>• X' m '■/ III % jiH I 4k 4.. discussions with city staff indicated they were not feasible. The approximate locations for the remaining four options are shown in Figure 2. A brief discussion of each option is presented below; Option 1 Description: The outlet route would be entirely within the City of Orono at a location approximately 750 feet west of the boundary with Plymouth. The outlet conveyance system would be a combination of force main and gravity pipe approximately 2,200 feet in length. As shown in Figure 2, the discharge pipe route would extend from the south central shoreline of Mooney Lake to County Road 6, then east to Femdale Road. The pipe w'ould connect to a recently constructed storm sewer catch basin on Femdale Road just south of County Road 6. A 12”-diameter pipe would need to be jacked under the highway. Discharge water would travel in storm sewer pipe within Femdale Road, then through several stormwater management wetlands southeast of Hadley Lake in Plymouth before reaching the City of Wayzata’s conveyance system. Advantages: •Discharge would be conveyed to a new storm sewer system capable of handling the additional flow and for which easements are already secured. •New easement costs may be low. The owner of the land across which the route traverses has indicated his willingness to grant an easement free of charge. (Note: The high end of the project cost estimate range assumes that permanent easements would need to be acquired along the entire route of the new force main/gravity pipe while the low end of the range assumes no easement costs would be incurred.) •The lift station could be placed in a secluded area away from residences and high traffic areas. •Tree loss would be minimal, since the route is mainly through open areas. •An access road may not be required. The property owrer has expressed a willingness to allow use of his driveway for maintenance purposes. (Note: The high end of the project cost estimate range assumes that a new access driveway would be needed, while the low end assumes the existing private driveway can be used at no cost.) Disadvantages: The elevation change is large (more than 40 feet), which requires a larger, more e.xpensive pump in the lift station. Three-phase power will be necessary for operation of the larger pump, which will require installation of a new line from County Road 6 to the lift station (approximately 800 feet). Pipe will have to be jacked under County Road 6 Estimated Cost:$190,000-5285,000 Mooney Lake Outlet Feasibility Study