06-28-1999 Council Packet - Laserfiche WebLink

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Estimated Cost:$180,000-$220,000 Option 2 Description: This route is located approximately parallel to and several hundred feet east of the route for Option 1. The pipe would again be a combination of force main and gravity pipe about 1,300 feet in length with a north-south alignment from the south shoreline of Mooney Lake. The discharge point would be a small wetland on the north side of County Road 6 just east of Femdale Road. The discharge would then be carried in existing drainage swales and pipes to Hadley Lake. Advantages: May not need to install a pipe under County Road 6, since a corrugated metal pipe imder the road from the small wetland already exists. Disadvantages: The elevation change between the lake and the wetland is large, which will require a large, more expensive lift station. Easement costs are likely to be very high Tree loss would be moderate to significant, since the route between the lake and County Road 6 is wooded. The Mooney Lake discharge could exacerbate existing problems with erosion along the open channel portion of the conveyance system south of County Road 6 There are currently no drainage easements covering a portion of the route south of County Road 6. Estimated Cost:$210,000-$250,000 Option 3 Description: This proposal would involve withdrawing water from the southeast bay of Mooney Lake and carrying the water in a combination of force main and gravity pipe for approximately 1,300 feet in an easterly direction to an existing catch basin at 18* Avenue and Ranier Lane in Plymouth. Advantages: Connects directly to an existing in-place storm sewer, so there would be no erosion problem at the outlet of the pipe from the lake. Approximately 50% of the length of the route lies within City-owned park property and existing easements, so easement costs could be reduced. The small elevation change (about 15 feet) would result in a smaller, lower cost lift station requiring only single phase power. L.