09/29/2021 EB Packet - Laserfiche WebLink

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Stormwater that doesn't flow to the basin will flow to the culvert at the southeast corner of the site, as will overflow from the basin itself. Groundwater was not detected in the boring that occurred in the vicinity of the proposed stormwater pond. Stormwater runoff for the proposed site conditions will match or will decrease from the existing conditions on the site for the 2-, 10-, and 100- year storm events. Also, the pond has been designed to provide a volume equal to 2.5 inches of runoff from the drainage area of the pond,per Rice Creek Watershed District rules. Stormwater Pollution Prevention The Stormwater Pollution Prevention Plan (SWPPP) notes the locations of several Best Management Practices (BMPs) that will be installed on the site to minimize erosion and sediment leaving the site. These BMPs include a rock construction entrance, silt fence (including redundant silt fence in the proximity of the wetland to the west), inlet protections, concrete washout area, and riprap for energy dissipation at pipe outfalls. There should be additional inlet protections noted in the SWPPP for any catch basins or inlets where 24th Avenue and Main Street border the property. 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. This is already noted in the applicant's SWPPP. Flood Plain Site does not fall within the flood management zone. Shoreland District Site does not fall within Shoreland District. Wetlands Per the Wetland Permit Application, there were five wetlands that are approximately 3.9 acres combined delineated on the site. The proposed project involves impact to wetland 3 (0.7381 acre), which will be filled. The wetland is annually farmed, severely degraded, and has low vegetative diversity. This fill will be mitigated through the purchase of wetland credits at a 1:1 ratio, per RCWD rules. Credits will be purchased from the City of Blaine Wetland Bank#1664. The other wetlands are not within the RCWD wetland management corridor, so WMC buffers will not be required. A 10-foot buffer will be required to meet city standards. 4