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Topography and Drainage Patterns <br /> The topography of the site is made up of rolling hills and a starting near North Arm Dr. and heading <br /> west towards Lake Minnetonka. Elevation is highest near North Arm Dr. along the west edge of the <br /> property (approximately 984' MSL). Stormwater will be treated by following NPDES and MCWD <br /> stormwater requirements before eventually draining into the wetland basin to the south. <br /> The existing drainage patterns have been primarily maintained.Topography of the site is not anticipated <br /> to be drastically altered, therefore, site drainage for the east half of the property will continue to flow <br /> towards Lake Minnetonka. Stormwater runoff from portions of Lots 2 and 3 will flow Into a proposed <br /> rainwater garden on lot 2. Drainage from the west half of the property will be diverted into one proposed <br /> stormwater pond located on lot 1. <br /> Invasive Species <br /> Invasive species were evaluated during the December 19, 2016 field visit. Reed canary grass was <br /> observed along parts of Lake Minnetonka water's edge.Common buckthom was found along the existing <br /> driveway on the south property line and In the small forest stand along the north property line (Area 1). <br /> Snow cover was present during the site walk, but the remainder of the grassland area Is expected to be <br /> manicured turf grass species. Attached is a vegetation management plan for the management of <br /> invasive species observed onsite (Appendix D). <br /> Existing Trees <br /> Approximately 60 trees were surveyed within the subject property and appear to be in fair to good <br /> health with no major diseases observed. A number of non-significant undesirable trees are located <br /> throughout the property such as green ash, American elm, and buckthorn. Significant trees on the <br /> property consist of red and white oak, walnut, black willow, maple, and basswood. These trees are <br /> defined as significant (due to size and species), therefore efforts will be made to preserve them using <br /> appropriate and feasible BMPs during construction. A total of 10 trees are proposed to be removed <br /> according to the proposed site plan. The trees consist of 9 silver maples and 1 basswood. Trees wilt be <br /> monitored for disease and decline during active construction.If signs or symptoms of severe tree disease <br /> are observed, trees will be removed and disposed of according to the Orono city code. Tree removal will <br /> be conducted during seasons when insect and disease transmission will be minimal, primarily in late <br /> Franzel Addition <br /> 800 North Arm Drive, Orono, MN Page 4 <br />