11-19-2024 Planning Commission Packet

Home Browse Search

Idyllvale Shores – Conservation Design Master Plan October 2024 Civil Methods, Inc.Page | 4 2.3.4 TOPOGRAPHIC SURVEY A topographic survey was performed for the site on 9/10/2024 (latest update) by Cornerstone Land Surveying, Inc. The survey is included in this report as Appendix D. This survey formed the basis of the overall design for the site. 2.3.5 ADDITIONAL SITE ANALYSIS Appendix E includes key figures from the Orono Natural Resources Inventory, specifically the figures depicting the Conceptual Greenway Corridor Alignment and the identified Natural Areas with Potential for Rare Species. The project location is shown on each of the figures. The project is partially located in a conceptual greenway corridor. The main part of the corridor in this location is connected to the north arm of Lake Minnetonka. No alteration of that part of the property is planned for this project. Previous iterations of the project included a driveway and house extending toward the water body, but the project has been modified to eliminate that component. The project components that are in the remaining portion of the conceptual greenway corridor (houses and private roads) will involve removal of some vegetation, but the narrower street section, large lots, and preserved trees will help to maintain the connected nature of the corridor to the extent possible. The map of natural areas with potential for rare species shows that the project is located near maple-basswood forest and oak forest mesic subtype. A survey of rare species was not conducted for the site, but it appears that only a small portion of the indicated areas would be potentially affected by the project, so they would remain fundamentally intact. If rare species are encountered, proper measures will be taken to ensure their protection. Much of the area most likely to contain rare species, including all project wetlands and the area of the project adjacent to the north arm of Lake Minnetonka, will be untouched. 3.CONSERVATION DESIGN MASTER PLAN COMPONENTS 3.1 EXISTING DRAINAGE SYSTEM The property currently features a residential dwelling, several accessory structures, landscaped areas, woodlands, wetlands, and direct access to Lake Minnetonka (North Arm). The site is characterized by a mix of soils with limited infiltration capacity. Stormwater runoff from the site flows southeast towards Lake Minnetonka. The site's topography is generally steep in the upland areas, influencing the direction of runoff. Three wetlands have been identified on the property and are detailed in a separate report. Runoff from the site flows through these wetlands before discharging into Lake Minnetonka. A natural overflow channel connects Wetland 1 to Wetland 2, with Wetland 2 discharging at the southern property boundary. 119