4.3 SR 03-20-2023 - Laserfiche WebLink

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Temporary BMPs will be inspected and maintained (per the NPDES Consti^uction Stormwater Permit) until permanent vegetation a�rd stabilization has occurred. Permanent BMPs will be incorporated into project design to minimize erosion during routine operational activities (post- construction). A geotechnical evaluation of the site has been completed which included 22 soil borings across the site. A map of the boring locations and detailed description of the soils observed at each is included in Exhibit B— Geotechnical Report. Topography of the Project site, collected via LiDAR, is illusti^ated on Appendix A— Figure 6. Site elevations were shown ranging fi^om 896 to 946 msl. Site topography generally slopes downward towards the basin located near the center before continuing to the south. Some areas of steep slopes (12% or greater) are present within the site. NOTE: For silica sand projects, the EAW 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. There is one DNR Public Waters watercourses, Ti^ott Brook (M-063-001.5), located within the project area. Ti^ott Brook meanders in and out of the project site along its western and southern boundaries. There are no DNR Public Waters basins, designated wildlife lakes, migratory waterfowl feeding/resting areas, ti^out streams/lakes, MPCA or NIDNR listed calcareous fens, outstandi�g resource value waters, and county or jurisdictional ditches within or adjacent to th�e project area. Prominent water features located within 1 mile of the project site include the aforementioned Ti^ott Brook as well as two DNR Public Waters wetlands. These wetlands were Kliever Marsh (71000300) located approximately 0.6 miles south of the project site, and an unnamed basin (71023800) located approximately 0.8 miles to the north. Th�ere are no MPCA Section 303d listed impaired waters located within a 1-mile radius of the project site. 12 wetland areas, totaling approximately 71 acres, were delineated on the main Project site and approved by the Local Government Unit (City ofElkRiver) of the Minnesota Wetland Conservation Act (Minnesota Rules 8420). A Notice ofDecision was issued on November 10, 2021 (LGUProjectNo. W-21-21). Surface water resources located within and adjacent to the Project site are illustrated on Appendix A — Figure 7. Page 8