09/24/81 Agenda & Packet - Laserfiche WebLink

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F 9/3/81 - Silver Lake Wood Development -3- the organic layers may be as shallow as 16 inches. Included within this Pt110 mapping unit are Seelyeville muck, Isanti and Lino soils. Markey soils have moderately rapid permeability, available water capacity and organic matter content are high. Natural fertility is low. The seasonal high water table is usually within one foot of the surface. This soil is poorly suited to building site development due to wetness and poor boring strength. This soil is very susceptible to frost action. All organic material must be removed prior to development. Urban Land Zimmerman Complex: Same as Zimmerman but erosion potential by water is increased significantly due to higher runoff vo]lunes generated by impervious materials. 161 Isanti loamy fine sand: This soil is a level, very poorly drained soil. It is found in depressions and drainageways and flats of glacial outwash plains. This soil is often adjacent to organic soils. The typical pedon might have a surface layer about 13 inches thick of black loamy fine sand. The subsoil is 29 inches thick and may be divided into two layers, an upper layer of dark gray loamy fine sand and a lower part of graysih brown fine sand. The underlying material is gray loamy fine sand. Included in this mapping unit are small areas of Lino and Markey muck soils. Permeability of Isanti soils is rapid. Available water capacity is low as is natural fertility. Surface runoff is ponded or very slow. The seasonal high 411, water table is at or within two feet of the surface. Because of extreme wetness, this soil is poorly suited for development. Foundation must be tile drained and built above the water table. The soil is very easily excavated, but has a ten- dency to cave in. It will be necessary to temporarily stabilize excavation sidewalls. This soil is moderately susceptible to frost action. All sidewalks, streets, and driveways must be properly designed to compensate for this action. 1027 Udorthents, wet substratum: This mapping unit is made up of hetrogeneous mixture of earthy fill material that has been placed on poorly or very poorly drained mineral or organic soils. The thickness and source of this fill is variable. Soil permeability, available water capacity and surface runoff are all variable. The suitability of these soils is variable. Intensive testing by a qualified soils engineer is necessary to evaluate any given parcel for its development potential. Hydrology: There are several interconnected wetlands and depressional areas lying with- in the proposed development area. These wetlands range in size from .5 acre to 12.5. Two of these wetlands are classified as public waters. They are identified as wetlands 1-11 and 1-29 in the Mounds View Wetland Inventory. The general drainage pattern for this property is from northwest to southeast. Waters exit the plat via open ditch and eventually enters Rice Creek upstream of Long Lake. •