2022-04-05 P & Z Packet - Laserfiche WebLink

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3.The Rice Creek Watershed District may also have floodplain regulations which must be followed. These regulations may include compensatory floodplain storage. 4.Proof of the Federal Emergency Management’s approval of all LOMAs/LOMRs shall be required prior to the full release of development securities. Stormwater/Wetlands/Erosion Control/Grading 1.Stormwater ponds on site will be owned and maintained by the property owner. However, the city is obligated, under its NPDES MS4 Permit to ensure these BMPs are properly managed. We are also required to have a written agreement for maintenance with the property owner. You will need to work with our city attorney to draft such an agreement. 2.The storm sewer outlet to the creek should be turned at an angle to be less disruptive to the flow of the creek. Rather than the two flow paths meeting at a right angle, something at 45 degrees or flatter would be more appropriate. 3.All requirements of the Rice Creek Watershed District shall be met with regard to Stormwater quality, rate and quantity. These requirements align with or are more stringent than the requirements of the city’s obligations under its NPDES MS4 Permit. 4.The Rice Creek Watershed District is the Local Governing Unit (LGU) for the Wetland Conservation Act (WCA). 5.Stormwater Access Charges will apply at a rate of $0.07/sf of new impervious area. 6.Retaining walls over 4 feet in height require engineer-signed drawings. 7.A Stormwater Polution Prevention Plan (SWPPP) shall be submitted. a.During construction, dust mitigation measures must be employed. b.Clearwater Creek is a highly sensitive water course and special care shall be taken to protect it from turbid discharges from the site. Sewer and Water st 1.The water main along the west side of 21 Avenue should connect to the north/east end of the water main recently installed in Fairview Street. The current plans do not seem to make this connection. st 2.The jurisdictional status of Clearwater Creek at 21 Avenue should be researched. Depending on which agency regulates this watercourse, a permit may be necessary to bore the watermain underneath it. 3.All watermain shall be PVC, C-900. All fittings shall be epoxy coated, Ductile Iron Pipe, with Cor-Blue or Stainless Steel T-Bolts. 4.The City Engineer’s Association of MN’s Standard Specifications should be used on all sewer, water and stormwater infrastructure, whether public or private. st Avenue should connect to the water 5.The water main along the west side of 21 main stub, coming from the north, at Commerce Drive. The current plans seem to st indicate the need to excavate in the pavement section of 21 Ave., however, based on the information from the record plan, below, this should not be necessary.