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I <br /> <br /> I <br /> I <br /> I <br /> I <br /> I <br />I <br /> <br /> I <br /> I <br /> I <br />I <br />'1 <br />I <br />i <br /> <br /> 3. For soils with percolation rates between one-half (1/2) <br />and five (5) minutes per inch, at least one (1) of the following <br />treatment techniques shall be used: <br /> <br />ao Provide at least six (6) inches of sandy loam <br /> textured soil with a percolation rate between <br /> f~ve (5) and fifteen (15) minutes per inch after <br />. - placement between the filter material and the <br /> coarse soil; <br />b. Divide the total soil treatment area into at <br /> least four (4) equal parts connected serially. <br /> <br />Subd. S I',©UNDS <br /> <br /> 1. Mounds may be constructed on soils having the site or <br />soil conditions specified in Chapter 150.014G. <br /> <br />2. The soil percolation rate in all layers of the natural <br />.or fill soil to a depth of at least twenty-four (24) inches below the <br />sand shall be faster than one hundred twenty (120) minutes per inch. <br /> <br /> 3. Below the sand layer, there shall be at least one (1) <br />layer of soil, either natural or fill, at least twelve (12) inches <br />thick, which has a percolation rate slower than five (5) minutes per <br />inch (loamy sand). <br /> <br /> 4. Wherever possible, mounds shall be located on flat areas <br />or crests of slopes. Mounds shall not be located on natural slopes of <br />more than three percent (3%) if the percolation rate is slower than <br />sixty (60) minutes per inch to a depth of at least twenty-four (24) <br />inches below the sand layer. <br /> <br /> 5. Mounds shall not be located on slopes exceeding six <br />percent (6%) if the soil percolation rate is slower than thirty (30) <br />minutes per inch to a depth of at least twenty-four (24) inches below <br />the sand layer. <br /> <br /> 6. Mounds shall not be located on natural slopes exceeding <br />twelve percent (12%) under any soil percolation rate conditions. <br /> <br /> 7. The bottom area of the filter material shall be sized <br />on the basis of two hundred (200) square feet per bedroom or eight- <br />three hundredths (0.83) square feet per gallon of waste per day. <br /> <br /> 8. In no case shall the width of the filter material in a <br />single bed exceed ten (10) feet. <br /> <br /> 9. A rubber tired tractor may be used for plowing or disking, <br />but in no case shall a rubber tired tractor be used after the surface <br />preparation is completed. A crawler or track-type tractor shall be <br />used for mound construction. <br /> <br /> 10. The d~scharge pipe from the pump to the mound area shall <br />be instal]ed prior to soil surface preparation. The trench shall be <br />carefol]y backfilled and compacted to prevent seepage of effluent. <br /> <br /> <br />