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d. Mound Systems, Type 1: This system is intended for areas of <br />moderately high ground watertable depth where percolation rates <br />are slow. <br />1. Percolation Rate: The percolation rate in 12 inches or <br />more of natural surface soil shall be faster than 60 minutes <br />- per inch and the percolation rate in subsoil and/or substratum <br />shall be faster than 120 minutes per inch. <br />2. Depth to'Groundwater or Seasonally Saturated Horizons: The <br />depth to groundwater shall be greater than 3 to 4 feet if <br />the percolation rate is 60 to 120 minutes per inch and 2 to <br />3 feet with a percolation rate 30 to 60 minutes per inch. <br />-12 <br />3. Slope: The land slope in the area being considered for <br />installation of the system -shall not be greater than 6%. <br />4. Position on the Landscape: The system shall be installed <br />.on level areas, on top of rises on convex slopes or on <br />sides of rises on plane. The systems shall not be installed' <br />in depressions, swales or drainageways. <br />5. Soils: The following soil classification series shall in <br />most cases be considered unsuitable for the installation of <br />standard systems, but acceptable for a*properly designed <br />mound system; <br />Cordova - Co <br />Dalbo - D1A <br />Dundas - Du - <br />Erin - EnB <br />Kilkenny <br />Lester - LsC2 <br />Lerdal - LmB <br />Minnetonka - Mt <br />Shields. - Sh <br />Shorewood - SwA, SwB <br />-12 <br />