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- 18 - <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> 2. For coarse soils haxring a percolation rate faster than one-half <br />(1/2) minute per inch, at least six (6) inches of sandy loam textured soil <br />having a percolation rate between five (5) and fifteen (15) minutes per inch <br />after placement (loamy sand to sandy loam) shall be placed between the filter <br />material and the coarse soil along the excavation bottom and sidewalls. <br /> <br /> 3. For soils with percolation rates between one-half (1/2) and five <br />(5) minutes per inch, at least one (1) of the following treatment techniques <br />shall be used: <br /> <br />Provide at least six (6) inches of sandy loam textured soil <br />with a percolation rate between five (5) and fifteen (15) <br />minutes per inch after placement between the filter material <br />and the coarse soil; <br /> <br />be <br /> <br />Distribution of effluent by pressure flow over the treatment <br />area as specified in section 150.014D Subd. 2; <br /> <br />Ce <br /> <br />Divide the total soil treatment area into at least four (4) <br />equal parts connected serially. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Subd. 4 MOUNDS <br /> <br /> 1. Mounds may be constructed on soils having the site or soil <br />conditions specified in Chapter 150.014G. <br /> <br /> 2. The soil percolation rate in all layers of the natural or fill soil <br />to a depth of at least twenty-four (24) inches below the sand shall be faster <br />than one hundred twenty (120) m{nutes per inch. <br /> <br /> 3. Below the sand layer, there shall be at least one (1) layer of <br />soil, either natural or fill, at least twelve (12) inches thick, which has a <br />percolation rate slower than five (5) minutes per inch (loamy sand). <br /> <br /> 4. Wherever possible, mounds shall be located on flat areas or crests <br />of slopes. Mounds shall not be located on natural slopes of more than three per <br />cent (3%) if the percolation rate is slower than sixty (60) minutes per inch to <br />a depth of at least twenty-four (24) inches below the. sand layer. <br /> <br /> 5. Mounds shall not be located on slopes exceeding six per cent (6%) <br />if the soil percolation rate is slower than thirty (30) minutes per inch to a <br />depth of at least twenty-four (24) inches below the samd layer. <br /> <br /> 6. Mounds shall not be located on natural slopes exceeding twelve per <br />cent (12%) under any soil percolation rate conditions. <br /> <br /> 7. The bottom area of the filter material shall be sized on the basis <br />of two hundred (200) gallons per bedroom at eighty-three hundredths (0.83) <br />square feet per gallon of waste per day. <br /> <br /> 8. In no case shall the width of the filter material in a single bed <br />exceed ten (10) feet. <br /> <br /> 9. A rubber tired tractor may be used for plowing or disking, but in <br />no case shall a rubber tired tractor be used after the surface preparation is <br /> <br /> <br />