2004-031 Council Resolution - Laserfiche WebLink

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City Council Marshan Estates March 8, 2004 Floodplain. Portions of the site lie within a Flood Plain Zone A, which follows County Ditch Number 10. RCWD has established the flood elevation at 886.0. The City's Floodplain Management Ordinance requires that principal structures be located no lower than one foot above the regulatory flood protection elevation. The City's Subdivision Ordinance requires that proposed basements be four (4) feet above the water table (normal water level) and two (2) feet above the design flood levels of ponding areas. All proposed buildings are outside the Flood Hazard Area. Shoreland Requirements. The proposed development lies within the Shoreland Overlay District of Marshan Lake, which is classified as a Natural Environment Lake. Impervious surface coverage of lots within the Shoreland District of a Natural Environment Lake cannot exceed 30% for residential development. Upon build -out of the proposed residential lots the impervious surface coverage is estimated to be approximately 20 %. Due to the size of the lots and the minimal impervious surface coverage, stormwater control and water quality treatment is not required provided Best Management Practices (BMP) are incorporated to the maximum extent possible. To insure adequate infiltration and treatment of stormwater runoff prior to entering County Ditch number Ten, staff is recommending a 20 -foot conservation easement be provided along the southern boundary of Lots 1 -4. This easement lies within the proposed 50 -foot drainage and utility easement. City has received a response from Tom Hovey, MN /DNR Area Hydrologist, in which he indicates that the project is consistent with shoreland guidelines. Tree Preservation. Since the site is so heavily wooded, the City's environmentalist has noted that the existing trees should be pruned and /or thinned to conform to the National Fire Wise Standards. A tree preservation plan will be required in conjunction with each individual building application. Lot 1, Block 1 Development. Lot one, Block one is identified as a potential future business site on the preliminary plat. The lot is guided mixed use and was included in the original Calthorpe Town Center Master Plan. However, due to access limitations to Town Center Parkway, it may not be possible to develop in this way without further expansion into the existing residential area to the east. Staff has determined that the property is of sufficient size to be subdivided into two residential lots if the commercial /mixed use option is not feasible. Rice Creek Watershed District (RCWD). The developer has made application to RCWD for approval of a Land Development Plan. RCWD states that because the proposed impervious area of the project is less than one acre in size, they will not require water quality treatment, noting most drainage will infiltrate in the pervious rear lot areas. The project was reviewed at the January 28th meeting, with a CAPROC (Conditional Approval Pending Receipt Of Changes) being issued. RCWD notes that Best Management Practices (BMPs) should be incorporated to the maximum extent possible.