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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations 23.6 Requirements for Land Application Sites To be approved as a site for land application of domestic septage, the following minimum requirements must be met: (1) The site shall: (A) Be a non-public site; (B) Not be in a shoreland area; (C) Be located in an Agricultural Zoning District. No land application is allowed in residential, institutional or commercial/industrial zones; (D) Contain soils that are not rapidly permeable at the application depth; (E) Not be located in a floodway or floodplain; (F) Not contain slopes greater than 12 percent; and (G) Not be classified as Very High Sensitivity or High Sensitivity of groundwater pollution according to the "Prairie du -Chien -Jordan Aquifer" map (Plate 6) of the Geologic Atlas of Washington County (1990), developed by the Minnesota Geologic Survey of the University of Minnesota. The Geologic Atlas of Washington County (1990) is incorporated by reference, and is not subject to frequent change. (2) Unless limed, septage shall either be injected or incorporated within six hours of surface application to a minimum depth of six inches. No significant amount of septage shall be present at the land surface after septage is injected or incorporated. (3) Be protected from unauthorized access. (4) Septage shall not be applied such that ponding or runoff occurs. (5) Septage must not be applied unless the soil has dried adequately from previous applications or rainfall so that ponding does not occur. (6) Septage shall not be applied by spray irrigation or other methods that will cause aerosols to drift from the application site. 23.7 Soil Suitability For the land application site to be suitable, the soil on the site must meet the following requirements: (1) Have medium or fine surface textures with a soil hydraulic loading rate less than or equal to 0.78 gpd/fe (percolation rate slower than 5 minutes per inch). Land application must not be performed on sand or peat surface textures; (2) Have a three foot vertical separation from the application depth to saturated soil conditions or bedrock; (3) Have six inches of available water holding capacity between the application depth and satured soil conditions or bedrock; (4) Have at least one horizon in the upper five feet that has a soil hydraulic loading rate less than 0.6 or fine sand (percolation rate slower than 10 minutes per inch) . Table X Daily surface application rates of domestic septage on non -frozen, non -snow covered sites Maximum Daily Soil Texture Application Rates — Gallons/Acre/Day Coarse Sand, Sand, Loamy Coarse Sand 0 Fine Sand, Very Fine Sand, Loamy Sand, Loamy Fine Sand, Loamy Very 10,000 Fine Sand Sandy Loam, Coarse Sandy Loam, Fine Sandy Loam, Very Fine Sandy 10,000 Loam. Loam, Silt Loam, Silt Sandy Clay Loam, Clay Loam, Silty Clay Loam, Sandy Clay, 10,000 Silty Clay, Clay 0 83 Washington County Development Code