11/28/2007 Env Bd Packet - Laserfiche WebLink

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• Unique resources Wetlands: There are 4 wetland on the site (Attachment 2). Wetland A will be filled and is a Wetland Conservation Act exempt wetland. Wetland C, non- exempt, will be filled in. Wetland D, non - exempt, will be filled. Wetland B is proposed to have 21,000 feet filled and is non - exempt. The wetland delineation has RCWD approval. The wetland replacement plan has been approved. Vegetation: No known or predicted. Wildlife: No known or predicted. Tree Preservation A tree inventory has been submitted. All trees are away from proposed soil disturbance areas and outside of proposed silt fence areas. Tree preservation is complete and adequate. AUAR In general, there should be a narrative to the Boards and the City Council addressing all of the mitigation strategies presented in the AUAR Landscaping Plant Schedule: More trees should be planted particularly in type C and D soils. Soils that are classified as C and D types of soils have higher runoff and lower infiltration rates. The C type soils intersect biofiltration pond number 9 and wetland mitigation area 10 on the North side, East side, South side and South west corner. Salix `Golden Curls' is a marginally hardy plant and non - native. The AUAR recommends that water infiltration areas be augmented with large herbaceous woody plant materials such as Aspen and Cottonwoods. Therefore substituting more of these types of species and more abundantly in the type C soil areas is in accordance with the AUAR recommendations. Cottonwoods must be of the non - seeding types. Recommend one tree per 25' O.C. in these type C soil areas. All sodded or landscape areas must be shown on the plan as irrigated. All infiltration areas and wetland mitigation areas should be seeded with the city native seed mix. The City transitional mix is shown on the plan and this is a good mix between cultural areas and wetland /pond areas. The BWSR (Minnesota Board of Water and Soil Resources) U8 mix is shown on the wetland mitigation slopes of the plan. A better mix selection from the BWSR choices would be the W1 mix. However, I would again recommend the City native pond seed mix for this area, supplemented with flowering native plugs every 10 feet. All biofiltration areas should also be supplemented with native flowering plugs.