11-20-2017 Planning Commission Packet

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CI.VI.l R O V P Summary Narrative: This Storm Water Management Report accompanies the Civil Plans prepared for the Ivy Place project dated 10/18/2017 and attached to this report. Existing Site Conditions: The existing site for this project is a vacant peninsula on Lake Minnetonka. The existing amount of impervious surface area is approximately 302 square feet and is owned by the adjacent property. Soils: Soil borings have been completed by Northern Technologies, Inc. dated March 30th, 2016. Soils on site vary considerably at depths as the site was filled in the past. There is an organic/peat layer with fill above at almost all locations. The soils at the surface have been classified to have a Hydrologic Soil Group "D"designation. Infiltration is not proposed as a part of this project. Groundwater: Groundwater has been identified in the in the soil borings ranging from an elevation of 914.8 to 925.7. Proposed Site: This project involves the construction of 2 single family homes along with a shared driveway that will split into separate driveways/parking areas. The total proposed impervious on the site is approximately 0.40 acres. Wetland Impacts: There are 2 existing wetlands present on this site. Wetland A, essentially borders the perimeter of the site against Lake Minnetonka and is approximately 9,781 square feet. Grading will occur within the buffer for this wetland but it will be restored to existing conditions and a proper buffer will be determined and planted. A 12-foot wide area of wetland A will be filled and converted into beach for each home. Mitigation for this filling will occur at another location along Wetland A. Wetland B is a low-grade wetland consisting of approximately 168 square feet in the center of the site. This project is proposing to fill Wetland B and create an equal wetland replacement area along Wetland A. www.CivilSiteGroup.com 4931 West 35th Street•Suite 200• St. Louis Park•Minnesota•55416 (612)615-0060