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- 18 - <br /> <br /> 2. Within shorelands of public waters, agricultural drain tile may be <br />used to intercept the seasonal high water table, provided the groundwater table <br />has a slope of at least two (2) feet per one hundred (100) feet toward the <br />public water, and provided the drain tile are installed upslope of the soil <br />treament system. There shall be at least twenty (20) feet of undisturbed soil <br />between the sidewall of the soil treatment unit and the agricultural drain <br />tile. <br /> <br /> 3. In all cases, the greatest practicable vertical separation <br />distance from the water table shall be provided. <br /> <br />Subd. 3 RAPIDLY P~BLK SOILS <br /> <br /> 1. Filter material for a soil treatment unit using gravity <br />distribution of effluent shall not be placed in contact with original soils <br />having a percolation rate faster than one-half (1/2) minute per inch. <br /> <br /> 2. For coarse soils having 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 betwen one-half (1/2) and five (5) <br />minutes per inch, at least one (1) of the following treatment techniques shall <br />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 />Divide the total soil treatment area into at least four (4) <br />equal parts connected serially. <br /> <br />Divide the total soil treatment area into at least four (4) <br />equal parts connected serially. <br /> <br />Subd. · HOUNDS <br /> <br /> 1. Mounds maybe constructed on soils having the site or soil <br />conditions specified in Section 150.01.4G. <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) minutes 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 /> <br />