Agenda - Council - 05/10/2005 - Laserfiche WebLink

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Preiimina~ Plat and Site Plan Review Rum River Estates .d)02, revised April 6, 2005 April i, '~ ~ Page .3 of 6 Street names must be added to the preliminary and final plat documents. The street names must be consistent with the Anoka County grid system. Staff suggests the street be 157m Avenue NW. The preliminary plat is proposing to provide a private street connection to the south. The preliminary plat should be revised to provide for a future public street connection that meets the City's street standards. 9~ Grading and Drainage. Grading, Drainage and Utility plans have been prepared by TEC Design We have some specific comments regarding these plans: The minimum floor elevation for all units on the north side of the road must be 870.0 which is 2 feet above the 100 year water level of' the existing and proposed ponds. The new pond in the middle of the site should b~: connected to the existing pond in River Pines 3rd with a pipe or by excavating to join the ponds. The backyard drainage ti'om lots 7 - 14 must be directed to a pond and not allowed to run directly to the wedands. The runoff cun-ently is directed off the property onto the adjacent development. Revised plans were submitted. The plans have grades less than 1% which is not permitted and many areas are less than 2% which require certificates of grading before occupancy permits are issued. Connection to the existing lift station in River Pines 3rd subdivision is required. ~[-he Street connection and utility connections assume construction of the Shade Tree Cottages development. Construction of this development will require acquisition of easements, preparation of additional plans and construction outside the limits of the property if for any reason the Shade Tree Cottages development is delayed or not constructed. The, proposed plans show filling outside the wetlands but below the. 100 year high water level of the wetlands. Filling of flood storage volume can only be approved by performing additional engineering calculations. The calculations consist of the following steps: i. Determine the existing and proposed flood storage volumes on the parcel. 2. Calculate the percentage of volume lost due to the proposed fill. 3. Apply the same percentage of volume change to all parcels abutting the wetland. 4. Calculate the new 100 year flood volume for the wetland. 5. ~ the increase in elevation is less than 0.5 ft and will not impact existing structures then the filling can be approved. Wetlands~ The subject property contains several wetlands. The plans indicate the wetlands have been delineated. A copy of the delineation report must be forwarded to the city. The report must also be iht'warded to the Lower Rum River Water Management Organization for verification. The plan is showing several areas where the wetlands will be impacted by construction. A sequencing plan for the impacts and mitigation must be submitted to the city and Lower Rum RAver WMO. ' Tl)e dc:velupment contains wetlands that need to be protected. The revised preliminary plat is providing the ~'~_:quested '~No Mow" zones along the edge of the wetlands. Staff is still recommending that appropriate -279-