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I Ie I I I I I I I .- I I I I I I ~ I 2.11,02 Section 2 - Physical Environment Geology and Topography Arden Hills is located in Ramsey County, which is dominated by the Eastern St. Croix Moraine, This glacial and terminal moraine is characterized by steep hills interspersed with deep depressions. The depressions are occupied by small lakes or are filled with peat. The topography of the City is relatively diverse, with undulating to steep slopes. The highest point in Ramsey County is located in Arden Hills, on the TCAAP property. The entire City is ultimately tributary to Rice Creek. Detailed descriptions of the City's bedrock geology can be obtained from the Rice Creek Watershed District. In addition, the Minnesota Geological Survey can provide maps detailing the bedrock hydrogeology of Minnesota, addressing rock formations and aquifers. Soils Most of the soils within Arden Hills are glacial tills. The soils tend to be well drained, and moderately coarse textured. The main source of information on existing soils found within the. City of Arden Hills was prepared by the Natural Resource Conservation Service (NRCS). The NRCS has established four general types of soil groups based on texture and slope as described below: . Group A - Low runoff potential, high infiltration . Group B - Moderate infiltration . Group C - Slow infiltration rate . Group D - Very slow infiltration rate, high runoff potential The runoff potential of an area is determined using these general soil characteristics in combination with land use classifications, vegetation of the area and rainfall intensity determined from charts for the various design storms. A summary of the soil group classifications in Arden Hills can be found in Table 1. Figure 2 is a soils map for the City, City of Arden Hills, Minnesota Local Stormwater Management Plan A-ARDEN0101,OO Page 8