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Option 2 <br />Description: This route is located approximately parallel to and several hundred feet east <br />of the Plymouth-Orono boundary. The pipe would again be a combination of force main <br />and gravity pipe about 1,300 feet in length with a north-south alignment from the south <br />shoreline of Mooney Lake. The discharge point would be a small wetland on the north <br />side of County Road 6 just east of Femdale Road. The discharge would then be carried in <br />existing drainage swales and pipes to Hadley Lake. <br />Advantages: <br />•Installation of a pipe under County Road 6 may not be needed since a <br />corrugated metal pipe under the road from the small wetland already <br />exists. <br />Disadvantages: <br />'fhe elevation change between the lake and the wetland is large, which <br />will require a large, more expensive pump in the lift station. <br />Easement costs are likely to be very high. <br />Tree loss w'ould be moderate to significant, since the route between the <br />lake and County Road 6 is wooded. <br />The Mooney Lake discharge could exacerbate existing problems with <br />erosion along the open charmel portion of the conveyance system <br />south of County Road 6. <br />There are currently no drainage easements covering a portion of the <br />route south of Courity Road 6. <br />Estimated Cost:$210,000-$250,000 <br />Option 3 <br />Description: This proposal would involve withdrawing water from the southeast bay of <br />Mooney Lake and carrying the water in a combination of force main and gravity pipe for <br />approximately 1,300 feet in an easterly direction to an existing catch basin at 18*** Avenue <br />and Ranier Lane in Plymouth. <br />Advantages: <br />The discharge pipe would connect directly to an existing in-place <br />storm sewer, so there would be no erosion problem at the outlet of the <br />pipe from the lake. <br />Approximately 50 percent of the length of the route lies within City- <br />owned park property and existing easements, so easement costs could <br />be reduced. <br />The small elevation change (about 15 feet) would result in a smaller, <br />lower cost lift station requiring only single phase power. <br />Mooney Lake Outlet <br />Feasibility Stu<fy