4.4 EAW Attachment - Laserfiche WebLink

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Page 18 uppermost Reno Member” (18).  Cw – Wonewoc Sandstone (Upper Cambrian) o Composed mostly of fine- to coarse-grained, moderately to well-sorted quartz sandstone. o The upper part is the coarsest-grained; the lower part is finer-grained, better sorted, and progressively finer-grained toward its base. o The thickness of the formation is 50 to 60 feet.  Ce – Eau Claire Formation (Middle and Upper Cambrian) o The formation ranges from 70 to 80 feet in thickness. o The contact with the underlying Mt. Simon Sandstone is conformable and transitional (18).  Faults, Paleozoic rocks o Interpreted to have had dip-slip movement. o Upward vertical displacement to the north and downward displacement to the south o Concealed by Quaternary sediments and recent alluvium Sinkholes and karst lands are not commonly found in Sherburne County. The Minnesota Natural Resource Atlas does not identify karst features near the project area (19). The proposed project is not anticipated to negatively interact with the geological features of the area. b) Soils and topography - Describe the soils on the site, giving NRCS (SCS) classifications and descriptions, including limitations of soils. Describe topography, any special site conditions relating to erosion potential, soil stability, or other soils limitations, such as steep slopes, highly permeable soils. Provide estimated volume and acreage of soil excavation and/or grading. Discuss impacts from project activities (distinguish between construction and operational activities) related to soils and topography. Identify measures during and after project construction to address soil limitations including stabilization, soil corrections or other measures. Erosion/sedimentation control related to stormwater runoff should be addressed in response to Item 12.b.ii. The project area includes primarily loamy sand textured soils. The United States Department of Agriculture (USDA) Natural Resources Conservation Service’s (NRCS) Web Soil Survey identified seven soil mapping units within the project area (Table 10 and Figure 13).  All the soil mapped onsite is either non-hydric or predominantly non-hydric.  90% of the site is mapped as not prime farmland.  90% of the site is mapped as hydrologic soil group A. Group A soils have a “high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well-drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission” (13).