09-14-2020 Council Packet - Laserfiche WebLink

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Conservation Design Plan Orchard Hills PID 053-3411823440035 4 Existence of Rare Plant Communities No rare plant communities were observed on the site and are not identified on the Hennepin County Natural Resource Inventory map. Most of the communities on the site are dominated by invasive species such as Reed Canary Grass, Common Buckthorn, Canada Thistle, and Garlic Mustard. Due to the low quality of these areas, no special protection of these areas is necessary. Conservation Design Master Plan STORMWATER MASTER PLAN The existing topography of the site directs surface water towards the Long Lake Creek along the north property boundary and towards the large wetland along the south and west property boundaries. These drainage patterns will be maintained after the redevelopment of the site and run off from impervious surfaces will be treated prior to discharge to the Long Lake Creek or the wetland. INVASIVE SPECIES REMOVAL AND MANAGEMENT PLANS Common Buckthorn, Reed Canary Grass, Garlic Mustard, Canada Thistle, and Smooth Brome were reviewed throughout the Subject Property during the wetland delineation field work activities. Garlic Mustard, Canada Thistle, and Smooth Brome are scattered throughout the upland areas and Sambatek does not recommend that these are removed. Common Buckthorn and Reed Canary Grass are primarily located within the wetland areas and within areas that will be the wetland buffer. Common Buckthorn and Reed Canary Grass will be removed as part of the landscape plan. Common Buckthorn can be removed via several different methods. Based on the size and amount of Common Buckthorn on the Subject Property, Sambatek recommends using the cut stump treatment method for treating Common Buckthorn. This method involves cutting the stems at ground level and treating the stems. This is most effective when completed in late summer and fall. The stems should be treated throughout fall and winter. Recommended herbicides include glyphosate, triclopyr amine, and triclopyr ester (Minnesota DNR). Reed Canary Grass can be controlled through mechanical or chemical methods. To control Reed Canary Grass through mechanical methods, mow between mid-June and October to reduce seed production. When cut during the growing season, Reed Canary Grass will have a second growth spurt in the fall so multiple mowing are necessary (Minnesota DNR). If choosing chemical methods for Reed Canary Grass, glyphosate can be used for effective control. If treatment occurs in or near wet areas an herbicide formulation approved for water use is required.