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2020_07-28_PWETCpacket
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2020_07-28_PWETCpacket
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Public Works Commission
Commission/Committee - Document Type
Agenda/Packet
Commission/Committee - Meeting Date
7/28/2020
Commission/Committee - Meeting Type
Regular
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The project is compatible with existing and planned land use and zoning. No mitigation <br />measures are needed. <br />10. Geology, Soils, and Topography/Land Forms <br />a. Geology - Describe the geology underlying the project area and identify and map any <br />susceptible geologic features such as sinkholes, shallow limestone formations, <br />unconfined/shallow aquifers, or karst conditions. Discuss any limitations of these features <br />for the project and any effects the project could have on these features. Identify any <br />project designs or mitigation measures to address effects to geologic features. <br />According to the Geologic Atlas of Ramsey County,zthe bedrock beneath the project <br />site is Decorah Shale, which is approximately 100 feet below the surface. The Decorah <br />Shale Group is typically 0-95 feet thick and is comprised of green calcareous shale with <br />thin limestone interbeds. The Decorah Shale Group is stratigraphically followed by the <br />Platteville and Glenwood Formations, the St. Peter Sandstone, the Prairie du Chien <br />Group, the Jordan Sandstone, the St. Lawrence formation, the Tunnel City Group <br />(formerly known as the Franconia Formation), the Wonewoc Sandstone (formerly known <br />as the Ironton and Galesville Sandstones), and the Eau Claire Formation. <br />There are no known sinkholes, unconfined/shallow aquifers, or karst features present <br />within or near the project limits. Given that the Decorah Shale is 100 feet below the <br />surface, it is not considered a shallow limestone formation. <br />b. Soils and Topography - Describe the soils on the site, giving NRCS (SCS) classifications <br />and descriptions, including limitations of soils. Describe topography, any special site <br />conditions relating to erosion potential, soil stability, or other soil limitations, such as steep <br />slopes or highly permeable soils. Provide estimated volume and acreage of soil <br />excavation and/or grading. Discuss impacts from project activities (distinguish between <br />construction and operational activities) related to soils and topography. Identify <br />measures during and offer project construction to address soil limitations including <br />stabilization, soil corrections, or other measures. Erosion/sedimentation control related to <br />stormwater runoff should be addressed in response to Item I I.b.ii. <br />According to the Natural Resources Conservation Service (NRCS) Web Soil Survey, there <br />are two soil types within the 72.8-acre project site. Urban land makes up approximately <br />98 percent (71.2 acres) of the project site, while the remaining 2 percent (1.6 acres) is an <br />urban land -Hayden -Kingsley complex, 3 to 15 percent slopes. The Web Soil Survey <br />includes Erosion Hazard Ratings that indicate the hazard of soil loss from off -road areas <br />after disturbance activities that expose soil surface. Both soil types within the project site <br />are not rated. <br />Table 4: Soil Types within the Project Limits <br />z Available at https://conservancy.umn.edu/handle/I 1299/58233 <br />Rosedale Center EAW 6 February 2020 <br />
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