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Mounds <br />a. Provide at least six (6) inches of sandy loam <br />textured soil with a percolation rate between five (5) <br />and fifteen (15) minutes per inch after placement <br />between the filter material and the coarse soil; <br />b. Divide the total soil treatment area into at least <br />four (4) equal parts connected serially. <br />c. Divide the total soil treatment area into at least <br />four (4) equal parts connected serially. <br />1. Mounds may be constructed on soils having the site or <br />soil conditions specified in Section 150.01.4G. <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 <br />the sand shall be faster than one hundred twenty (120) minutes <br />per inch. <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) <br />inches thick, which has a percolation rate slower than five (5) <br />minutes per inch (loamy sand). <br />4. Wherever possible, mounds shall be located on flat areas <br />or crests of slopes. Mounds shall not be located on natural <br />slopes of more than three per cent (3%) if the percolation rate <br />is slower than sixty (60) minutes per inch to a depth of at least <br />twenty -four (24) inches below the sand layer. <br />5. Mounds shall not be located on slopes exceeding six per <br />cent (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 <br />below the sand layer. <br />6. Mounds shall not be located on natural slopes exceeding <br />twelve per cent (122) under any soil percolation rate conditions. <br />7. The bottom area of the filter material shall be sized on <br />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 />8. In no case shall the width of the filter material in a <br />single bed exceed ten (10) feet. <br />9. A rubber tired tractor may be used for plowing or <br />disking, but in no case shall a rubber tired tractor be used <br />after the surface preparation is completed. A crawler or track - <br />type tractor shall be used for mound construction. <br />10. The discharge pipe from the pump to the mound area shall <br />be installed prior to soil surface preparation. The trench shall <br />