07/29/2020 EB Packet - Laserfiche WebLink

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3 Stormwater Management, Erosion, and Sediment Control Stormwater management plan has been submitted and is being reviewed by the City Engineer. The following general review is adapted from the Preliminary Storm Water Management Plan prepared by Pioneer Engineering. The north portion of the property currently drains to the northeast to Wetland B, and then flowing north. The south portion of the site drains to Wetland A and south from there through a culvert under County Road 14. There is also a small section of the property that drains to the existing storm sewer on Otter Lake Road. Ultimately, the site drains to Clearwater Creek and Peltier Lake, both of which are impaired waters. The plan for this development is to route storm water from the site to a basin with connected filtration cell that will outlet to Wetland A. Stormwater Pollution Prevention The Grading, Drainage, and Erosion Control Plan calls for inlet protections, a rock construction exit, and silt fence for perimeter control. Redundant perimeter controls near the wetlands are noted, as is secondary perimeter control around the high water level of the storm water basin. Being that this site will drain to impaired waters, Clearwater Creek and Peltier Lake, stabilization of exposed soil areas must occur within 7 days after the construction activity in that area permanently ceases. Flood Plain Site does not fall within the flood management zone. Wetlands Per the wetland delineation report, two wetlands were delineated within the site totaling 4.29 acres. Wetland A is a 2.59 acre partially farmed seasonally flooded basin/fresh wet meadow/shallow marsh. Plant species in this wetland include reed canary grass (Phalaris arundinacea), yellow nutsedge (Cyperus esculentus), and corn (Zea mays). Wetland B is a 1.7 acre partially farmed seasonally flooded basin/fresh wet meadow/shallow marsh. Plant species in this wetland include reed canary grass (Phalaris arundinacea) and corn (Zea mays).