01/04/2022 EB Packet - Laserfiche WebLink

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3 working on the site. Natural-netting type erosion blanket must be used where blanket is needed. Surmountable curb sections should be added to provide connectivity between the wetland in the south of the site and the larger wetland to the northwest. The wetland northwest of the project site is significant, with buffer areas around it receiving native seed and establishment work associated with earlier additions of NorthPointe. Utilizing Mn DOT type 3 mulch with Minnesota Crop Improvement Association tags will minimize the risk of invasive and/or noxious weed species being introduced in proximity to these restored native plant areas. No impacts are proposed to the smaller wetland on the south portion of the project parcel. No additional environmental assessments are required. Soils Soil types according to the Natural Resources Conservation Service Soil Survey Geographic Database include: Hayden fine sandy loam with 2-6% slopes, Hayden fine sandy loam with 12-24% slopes, and small sections of Rifle mucky peat in the far north and west corners of the site. The Hayden fine sandy loam is a non-hydric soil in hydrologic group B, which has moderate infiltration rate, is moderately well-drained to well-drained, and has moderate rate of water transmission. Rifle mucky peat is a hydric soil type in hydrologic group A/D, which has a high infiltration rate when drained, and a very slow infiltration rate when undrained. Nine soil borings were performed in 2013 related to the entire NorthPointe subdivision, though only one was performed near the proposed senior housing facility. This boring detected silty clay and organic matter in approximately the first foot, with sandy lean clay with traces of gravel from the topsoil to 21 feet. Groundwater was not detected in this boring. Stormwater Management A stormwater management plan has been submitted and will receive a full review by the Engineering Department. The following summary review is based upon the same stormwater management plan and drainage calculations. The majority of stormwater on the site currently drains to wet sedimentation pond 200P, which is outside the site boundary to the west; wet sedimentation pond 300P, which is in the northern portion of the site; and Wetland 1P, which is just west of the site. This wetland outlets to Ditch 3P, which heads northeast to a larger wetland complex east of 35E, and ultimately to Peltier Lake.