07/25/2001 Env Bd Packet - Laserfiche WebLink

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Short Term Maintenance Requirements Vegetation Short- term maintenance would require partial re- vegetation in areas where the native vegetation is not able to survive. This should probably be a minimal requirement for the developer as the seeding contractor for the project shall be responsible for the establishment of the vegetation until the city or homeowner's association takes over the project. Due to the native planting seed mixture (MNDOT 25A), which is proposed for the stormwater areas, the developer will be required to contract a landscaper to perform a prescribed mowing or burn once prior to handing the project over to the homeowner's association or the city. The homeowner's association or city shall contract a landscaper to perform a prescribed mowing or burn once every five years. Permission for the prescribed burn shall need to be obtained from the city fire chief or the MN State Fire Marshall. This is a good short and long term maintenance technique to ensure the healthy and continued growth of native species. All risk for the fire is taken by the landscaper using the burning technique. Erosion In the event that the side slopes of the stormwater management basins erode the following short- term maintenance requirements may include: 1. Excavation of sediment where it is accumulating in the basin with light earth- moving equipment. 2. Re- grading of the side slopes and bottom of basin (if necessary) with light earth - moving equipment. 3. Re- seeding as originally specified in the vegetation management plan. 4. Installation of an appropriate erosion control blanket to reinforce the side slopes if deemed necessary by an erosion control specialist. Long Term Maintenance Requirements Depending upon the quality of the stormwater being infiltrated and the ability of the buffers to treat the stormwater, the soils in the infiltration ponds may become clogged with fine material over time to the point of infiltrating the runoff generated from a 2.5" rainfall event plus the run- off from the Minneapolis -St. Paul median storm of 0.34 "in 72 hours. Expected long- term maintenance would require minor rehabilitation of the infiltration ponds and infiltration trenches. Page 4