06-22-1994 Council Agenda - Laserfiche WebLink

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Ramsey - Washington Metro District May 18, 1994 To: Little Canada Planning Commission Re: Proposed Twin Lake Pines Subdivision :NAY 1 -g 1994 1902 East County Road B Maplewood, MN 55109 (612) 777 -3665 The District recently received a copy of the planning report for this project from Northwest Associated Consultants. In reviewing the preliminary plans, the following general concerns came to mind; Water Quantity The District's policy is that the low floor elevation of homes must be at least two feet above the 100 year flood elevation for adjacent water bodies. Barr Engineering has recently determined that the 100 year flood elevation for Twin Lake is 875.1 ft msl. The District has also identified a potential flooding problem for Twin Lake. The lake has no formal outlet. If the water level of the lake is allowed to get too high and a very large storm were to occur, there is a potential for flooding of adjacent homes and water would flow overland to interstate 694. Because of this potential problem, the District will limit the quantity of water allowed to be discharged into the lake from the sites stormwater system. Water Quality Twin Lake has very good water quality for a lake in the metro area. This is most likely due to the undeveloped nature of the Lake's immediate watershed. Construction of homes on the shores of Twin Lake has the potential to degrade the water quality of the lake. During construction, the District will require strict erosion and sedimentation measures to prevent sediment from reaching the lake. Stormwater from the site will not be allowed to enter the lake without prior treatment; i.e. running the water through the wetland area. The Watershed District will require a permit for this project and will address the above concerns with use of special provisions to the permit. Sincerely, Clifton nger District Administrator Page 18