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SECTION 9: INNOVATIVE MOUND SYSTEMS A. Applicability '. 1. Percolation Rate - The percolation rate in 12 inches i or more of natural surface soil shall be faster than I 60 minutes per inch and the percolation rate in sub- soil -and/or -substratum shall -be faster --than 120 minutes per 'inch. 2. Depth to Groundwater - The depth to groundwater shall be greater than 3 to -4 feet if the percolation rate is I 60 to 120 minutes per inch and 2 to 3 feet with a percolation rate 30 to 60.minutes per inch. 3. Flood Hazard - There shall be no hazard of flooding - within t e area considered for installation of the system. 4. Slloo e_ - The land slope in the area being considered of r installation of the system shall not be_,greater [ , -than 6%. '. 5. Position on the Landscape - The system shall be in- stalled on level areas, on top of rises on convex , slopes -or on sides of rises on plane. 'The systems shall not be'installed in depressions, swales or drainageways. B. General Requirements of Mound Systems ' C1. Below the sand layer there shall be at least one layer *of soil, either natural or fill, at least 12 inches r - -thick, which has a percolation rate slower than five !_r minutes per inch- (loamy sand) . 2. Wherever.possible mounds shall be located on flat areas :or crests of slopes. Mounds shall not be located on natural - slopes of more than three percent if the percolation,rate is slower than 60 minutes per inch to a depth of at least 24 inches below the sand layer. 3. Mounds shall not be located on slopes exceeding six percent if the soil percolation rate is slower than 30 minutes per inch to.a depth of. at least 24 inches below the sand layer. 4. Mounds shall not be located on natural slopes exceeding 12 percent under any soil percolation. rate.conditions. 5. The bottom area.of the filter material shall be sized the basis of 125 feet bedroom or 0.83 on square per square feet per gallon of waste per day. -45