12-06-1976 Planning Packet - Laserfiche WebLink

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r i Tayie -4- y-- rveliminaiy Soil, SiU Jid Wetland Hvaluation Painters Creek Estate in Citv of Orono Dark Blue Medium Blue Medium Red Dark Red M . Broun 6. Marsh: The map symbol for this soil is Ma and the map color is dark blue. The upper 5 to 10 feet of the marsh is peaty muck or muck. This covers other layers formed in what was formerly a glacial lake. The watertable is near or above the surface the entire year. These soils have very low bearing capacity. The development characteristics of these soils are generally unfavorable. These areas are best used for natural water storage and as scenic open space areas of developments. 7. Peaty Muck over loam: The map symbol for this soil is I’m and the map color is medium blue. This soil occurs in depressions and drainageways. The depth of the peaty muck varies from 12 to 42 inches. The underlying material con sists of gray loam, silty clay loam, or clay loam. The watertable is at or near the surface except during exceptionally dry periods. The soil is subject to px)nding during wet periods. There is a high px)tential for frost action to roads and parking areas. IV. SOIL SUITABILITY FOR ON-SITE WASTE DISPOSAL The area of proposed development is not scheduled to receive municipal sewer services. This means that any homes constructed must utilize some sort of on-site soil absorption system for the disposal and treatment of the household wastes. A discussion of each soils potential as a waste disposal site follows: 1, Erin loam - EnB, EnC, EnD, EnE : This soil is a well-drained upland soil. The watertable is usually below 5 feet. Erin soils however have a large clay content in their subsoil. The USDA textural classification is clay loam. Percolation rates properly conducted on this soil are generally greater than the 60 minutes per inch required by the present Minnesota Sewage Code. This would prohibit the installation of the conventional on-site soil absorption system consisting of a septic tank with seepage trenches 24 to 36 inches deep in the soil. Erin soils can in many cases be utilized for waste disposal ^d treat ment if an innovative mound systan is installed. The following general conditions must be met: a).Percolation rate - The percolation rate in 12 inches or more of natural surface soil shall be faster than 60 minutes per inch and the percolation rate in subsoil and/or substratum shall be faster than 120 minutes per inch. b).Depth to groundwater - The depth to groundwater shall be greater than 5 to 4 feet if the percolation rate is 60 to 120 minutes per inch and 2 to 3 feet with a percolation rate of 30 to 60 minutes per inch. J 'I ■ r i • 4