02-19-2002 Planning Packet - Laserfiche WebLink

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buckthorn be eliminated. No planting should occur for at least two weeks following glyphosphate treatment. In the wetland mitigation site, trees, shrubs and ground cover will be planted to restore native vegetation to the area (Appendix B, Sheet 2). Inunediately following final grading, the soil should be loosened and broadcast with a wetland seed mix. The Mn/DOT seed mixture 25A modified (26B) (Prairie Meadow & Streambank) or equivalent will be used in the wetland area to provide a mixture of native forbs and ground cover. The Mn/DOT mixture 5A Modified (5B) (Savanna and Woodland Edge) will be used in the upland buffer areas south of the mitigation site and north of the existing ditch (Appendix B, Sheet 1). Both of these mixes will be applied at a rate of 30 pounds per acre, and will not be seeded prior to April 15. Seed will only be broadcast into dry or saturated soils. Seed should not be placed into standing or moving water. The site should be disk anchored immediately following seeding to provide erosion control on the site. Mulching will be done at a rate of 2 tons per acre and must be certified weed free. Because the site is designed to be a floodplain, trees such as silver maple (Acer saccarinum), green ash (Fraxinus pennsylvanica), and American elm (Ulmus americana) will be planted (Appendix B. Sheet 2). If these species are unavailable they may be substituted with black ash (Fraxinus nigra), red maple (Acer rubra) or hackberry (Celtus occidenialis). At least one third of the planted trees must be five-year or older trees with intact root balls. This is necessary to increase the survival rate and ensure the proper vegetation becomes established. Additional tree plantings can be seedlings. In the buffer area, bur oak (Quercus macrocarpa) w ill be planted to provide additional tree cover. If bur oak is unavailable, than red oak (Quercus rubra) or white oak (Quercus alba) maybe substituted. Half of the oaks should be mature trees. For all trees, the mature stock should be spread throughout the site to provide maximum coverage. At least three inches of hardwood mulch will be spread at the base of all the trees and shaped to help retain moisture. No trees should be planted in standing water, and all trees should be a minimum of ten feet apart. No trees will be planted in the buffer area north of the drainage ditch. The large black willow (SalLx nigra) within the drainage ditch on the east side of the property will be preserved. No black willow or cottonwood (Populus deUoides) should be planted in the mitigation site. Because these species can be grown from cuttings, any branches of these trees should ^ removed from the mitigation area. Minnehaha Craak Watarahad District Permit Application City of Orono. Minnaaota A-LONGL0204.00 Page 10