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w <br />f <br />! <br />f <br />y ■ <br />ii. <br />^ Prolimuury Soil, Si^^ynd Wetland Evaluation <br />* Taintcrs Creek Estate City of Orono <br />%• <br />Light <br />Red <br />Dark <br />Blue <br />Medium <br />Blue <br />d). Slope - The land slope in the area proposed for the soil absorp <br />tion field shall not be greater than 121. <br />e). Depth to land rock or other impervious materials - the depth to <br />iJi5)ervious materials must be more than 6 feet. <br />Another innovative system can be installed on Hayden soils. This <br />system, the Shallow Subsurface Soil Abso^tion System, improves the <br />chances of proper functioning. The requirements for this system <br />are as follows: <br />a). Percolation rate - The percolation rate must be faster than 60 <br />minutes per inch. <br />b). Depth to groundwater - Depth to groundwater or seasonally sat- <br />urated area must be greater than three feet. <br />c). Flood Hazard - There must be no flooding hazard. <br />d). Slope - The land slope in the area being considered for install- <br />ation of the system must not be greater than 12%. <br />e).Position on the landscape - The system shall be installed on level <br />areas, on top of rises on convex slopes, on sides of rises on <br />plane. The systems shall not be installed in depressions, swales, <br />or drainageways. <br />Details on the construction procedures for these systems may be obtained <br />from the District Office in Wayzata. <br />5. Lerdal loam - LmB: <br />This is a somewhat poorly drained soil. There is a seasonal water- <br />table present 3 to 5 feet below the surface. The soil is also slowly <br />permeable with slow percolation rates quite common. The soil absorp­ <br />tion system which will function on soils such as this is the Innova­ <br />tive Mound System. Requirements for this system were given in Section <br />4.1. <br />6. Marsh - Ma: <br />This is a collection of organic soils. There is generally water at <br />the surface for the entire year except during exceptionally dry periods. <br />On-site soil absorption systems may not be installed in these wet­ <br />land areas. <br />7. Peaty muck over loam - Pm: <br />This is a shallow organic soil over loamy material. The soil is found <br />in depressions and drainagewa>s. The watertable is at or near the <br />surface for the entire year except during exceptionally dry periods. <br />This soil is unsuitable for installation of any soil absorption system. <br />I <br />f <br />\ <br />«! <br />I <br />1 <br />. <br />} <br />A k <br />•* ' <br />is <br />r] <br />I <br />; ' <br /><■ r <br />li