09/24/81 Agenda & Packet - Laserfiche WebLink

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9/3/81 - Silver Lake Wood Development -2- . a surface layer of dark grayish brown loamy fines and about nine inches thick. • The subsurface layer is grayish brown loamy fine sand about six inches thick. The underlying or subsoil layers are stratified light yellowish brown to dark brown fine sands. Included within this mapping unit are small areas of well drained Lino soil variant in lower portions of the landscape. Also in depres- sions may be found poorly drained Isanti soils. The Zimmerman soil has rapid permeability; surface runoff is slow to very slow; available water capacity is low as is natural fertility and organic matter content. This soil is well suited to building site development, but poorly suited to sanitary septic systems due to the extreme permeability. Excavation sites must be temporarily sta4ilized to prevent sidewall cave in due to the poor cohesiveness of the soil. The seasonal high water table is below six feet. Frost action is rated as being low. Erosion needs to be controlled during construction. Gullies will form easily on sloping areas and the potential for wind erosion is extremely great. All exposed soils should be sodded or seed and mulched as soon as rough grading is completed. The rough grading process should be completed as quickly as possible. The flat and open nature of the landscape may precipitate extreme wind erosion conditions. To establish good ground cover, it will be necessary to augment the natural fertility with the addition of a loamy textured topsoil high in organics. Seelyeville muck: This is a level, very poorly drained soil. It occurs in bogs on plane or slightly concave side slopes of glacial outwash plains and moraines. This soil and landscape unit is very subject to flooding via runoff from steeper410 adjacent slopes. The typical pedon consist of a seven inch black muck surface layers, a stratified dark brown to black mucky peat middle layer 36 inches thick, and a bottom layer of very dark brown muck. Seelyeville muck soils are generally no deeper than 50 inches. Included in this mapping unit are small areas of other organic soils such as Cathro and Markey muck. Cathro soils are generally loamy within 51 inches and Markey are sandy within 51 inches. Small islands of mineral soils may also be found within the Seelyeville unit. The Seelyeville soil has moderately rapid permeability. Available water capacity is very high; runoff is very slow; organic matter content is very high, and natural fertility is low. The water table is commonly at a depth of less than two feet. This soil has very poor building site potential. The high water table and poor bearing strength of the soil are the main limitations. To build within land occupied by this or any other organic soil, it will be necessary to remove all organic matter and replace it with suitable mineral soils. Tile drain systems are highly recommended to overcome high water table conditions. These soils are subject to severe frost action and settling. Markey muck: This is a level, very poorly drained organic soil It is generally found in small depressions on the fringe of large Boyson glacial outwash plains. This mapping unit is very subject to flooding from adjacent steeper slopes. The typical pedon consists of a surface layer nine inches thick of black muck. The next layer is black or brown muck 21 inches thick. The underlying material is black and olive gray, stratified sandy material, In some areas