Agenda - Council - 06/13/2017 - Laserfiche WebLink

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Record of Decision — Riverstone Addition Environmental Assessment Worksheet Cover Types. The project will convert approximately 85.48 acres of annually -tilled cropland and small areas of trees to streets, homes, lawns, landscaping, and stormwater features. The project will include about 20.60 acres of open space, including 9.5 acres of stormwater basins. Shorelands. The project area includes 4.4 acres of shoreland. The project design is consistent with residential densities allowed under Minnesota shoreland rules and PUD shoreland evaluation methods when the density increase multiplier is applied. Floodplains. The proposed project will not affect the floodplains of Lake Itasca or the Mississippi River. Proposed homes will have lowest floor elevations at least 2 feet above the 100-year flood elevation, or 1 foot above the emergency overflow, whichever is greater. Land Use. The proposed project is compatible with surrounding land uses and the proposed land use and zoning. The project will require a Comprehensive Plan Amendment to guide the site for LDR-Low Density Residential, which is intended for an average density of 4 units/acre. Geology and Soils. Residential development grading is expected to affect about 87 acres of land and involve movement of about 475,000 cubic yards of soil to construct streets, residential building pads, and stormwater features. Water Quality. Compliance with multiple stormwater requirements will minimize and mitigate potential adverse effects on receiving waters. Project construction will add about 14.5 acres of impervious surface to the site, consisting of streets, homes, and driveways. Stormwater rate and volume controls will limit increases in runoff volume and associated pollutant transport. Stormwater ponds and infiltration basins are expected to mitigate potential adverse effects on water quality. Wetlands and Surface Waters. The project has been designed to avoid and minimize effects on wetlands to the extent practicable. Construction of a bituminous trail and an emergency overflow from Wetland 2 will require placement of fill in 2,039 square feet of Type 1 seasonally - flooded, farmed wetland. The proposed wetland impact is covered under the Minnesota Wetland Conservation Act 2,500-square-foot de minimis exemption threshold that applies to wetlands in the project area. Representatives from the U.S. Army Corps of Engineers reviewed the wetlands in the field on April 21, 2017, and stated that wetlands on the site are isolated from navigable waters and are not regulated under Section 404 of the Federal Clean Water Act. Wastewater. The project is expected to produce normal domestic wastewater that will be typical of residential developments. The proposed project does not raise wastewater conveyance or treatment capacity concerns. Hazardous Materials. The project area has been used as cropland since at least the 1930s. The site is not known to include environmental hazards. The agricultural land use history suggests low potential for environmental contamination. 10. Ecological Resources. Project development will convert about 85.5 acres of cropland and 0.9 acres of trees to residential land uses. The project may affect the number and type of wildlife species in the area, but changes in wildlife abundance are not expected to be regionally significant. 6