Agenda - Council - 12/14/2021 - Laserfiche WebLink

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Trott Brook Crossing EAW August 2021 Review of a Digital Elevation Model(DEM)showing slopes of 0-11.9%, 12.0-17.9% and 18.0- 19.6%revealed that the site contains only narrow bands of steep slopes that do not extend further than 50 feet, and no bluffs (Figure 3). Soils mapping classifies the steepest part of the site as 12- 25% slopes (Table 4,Figure 7). As shown on the Site Plan(Appendix A),these slopes are proposed to be developed into residential lots and a street. Development of the project area will disturb more than one acre of land and therefore will require application for coverage under the National Pollutant Discharge Elimination System/State Disposal System(NPDES/SDS)General Permit administered by the Minnesota Pollution Control Agency (MPCA)prior to initiation of earthwork. In compliance with the General NPDES Permit for construction activities,the project proponent and construction contractor will need to implement Best Management Practices(BMPs)to reduce erosion and sedimentation and stabilize exposed soils after construction. Erosion and sedimentation control BMPs related to stormwater runoff are discussed in greater detail within Item ll.b.ii. Additional BMPs required for construction projects within 1 mile of and draining to impaired waters are listed under Item ll.a.i. NOTE: For silica sand projects, the EA must include a hydrogeologic investigation assessing the potential groundwater and surface water effects and geologic conditions that could create an increased risk of potentially significant effects on groundwater and surface water. Descriptions of water resources and potential effects from the project in EAW Item 11 must be consistent with the geology, soils and topography/land forms and potential effects described in EAW Item 10. 11. Water Resources a. Describe surface water and groundwater features on or near the site in a.i. and a.ii. below. i. Surface water-lakes, streams, wetlands, intermittent channels, and county/judicial ditches. Include any special designations such as public waters, trout stream/lake, wildlife lakes, migratory waterfowl feeding/resting lake, and outstanding resource value water. Include water quality impairments or special designations listed on the current MPCA 303d Impaired Waters List that are within 1 mile of the project. Include DNR Public Waters Inventory number(s)> if any. Eight wetlands were delineated on the subject site by Kjolhaug Environmental Services on June 2, 2021 (Figure 6). A wetland delineation report has been submitted to the Lower Rum River Watershed Management Organization(LRRWMO) and the U.S. Army Corps of Engineers (USAGE), and concurrence is pending. The U.S. Army Corps of assigned the wetland delineation submittal regulatory file no. 2021-01498-SSG on July 27,2021. The wetland delineation report has been included in Appendix B. Delineated wetlands within the project boundary are summarized below on the following page in Table 5. 10