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Cyphers Logistic Park AUAR 24 March 2022 10. Geology, Soils, and Topography/Land Forms AUAR Guidance: A map should be included to show any groundwater hazards identified. A standard soils map for the area should be included. a. Geology - Describe the geology underlying the project area and identify and map any susceptible geologic features such as sinkholes, shallow limestone formations, unconfined/shallow aquifers, or karst conditions. Discuss any limitations of these features for the project and any effects the project could have on these features. Identify any project designs or mitigation measures to address effects to geologic features. AUAR Guidance: A map should be included to show any groundwater hazards identified. According to the Geologic Atlas of Washington County (Minnesota Geological Survey, 2016), the AUAR s tudy area is underlain by sand, gravel, and diamicton. Bedrock is encountered at varying depths across the AUAR s tudy a rea, ranging in depth from approximately 1-50 feet below ground surface. Bedrock is comprised of Platteville and Glenwood Formations, fine -grained limestone containing thin shale partings near the top and base, underlain by green, sandy shale. The AUAR s tudy area is located within a karst-prone area where karst features may form on the land surface and where they are likely present in the subsurface. Site specific subsurface investigations should be completed prior to work commencement. If karst conditions are found to be present, the project proposer will follow the Valley Branch Watershed District, City of Lake Elmo, and the Minnesota Pollution Control Agency (M PCA) design guidelines. Groundwater is present at approximately 0 to 50 feet below the surface. 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 soil limitations, such as steep slopes or 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 11.b.ii. AUAR Guidance: The number of acres to be graded and number of cubic yards of soil to be moved need not be given; instead, a general discussion of the likely earthmoving needs for development of the area should be given, with an emphasis on unusual or problem areas. In discussing mitigation measures, both the standard requirements of the local ordinances and any special measures that would be added for AUAR purposes should be included. A standard soils map for the area should be included. According to the Natural Resources Conservation Service (NRCS) Web Soil Survey, the area is comprised of 13 different soil types (s ee Table 4 and Figure 10). A Geotechnical Evaluation Report was completed by Braun Intertec (August 2021) on the study area south of 34th Street N, which is the area the project p roposer intends to develop for business park uses. According to