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6. Mounds sha!~ not be located on siopas 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 /> <br /> 7. Mounds shall not be located on natural slopes exceeding <br />twelve per cent (12%) under any soil percolation rate conditions. <br /> <br /> 8. The bottom area of the filter material shall b~ 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 /> <br /> 9. In no case shall the width of the filter material in a <br />single bed exceed ten (10) feet. <br /> <br /> 10. 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 <br />surface preparation is completed. A crawler or track-type tractor <br />shall be used for mound construction where the soil percolation <br />rate is slower than 15 minutes per inch. <br /> <br /> 11. The discharge pipe from the pump to the mound area shall <br />be installed prior to soil surface preparation. The trench shall <br />be carefully backfilled and compacted to prevent seepage of <br />effluent. <br /> <br />12. Soil Surface Preparation. <br /> <br />Ail vegetation in excess of four inches in length and <br />dead organic debris must be removed from the surface of <br />the total area selected for the mound, including the area <br />under the banks. <br /> <br />The total area selected for the mound, including the <br />dikes, shall be plowed to a depth of at least eight (8) <br />inches. Furrows shall run perpendicular to the direction <br />of slopes. All furrows shall be thrown uphill and there <br />shall be no deadfurrow under the mound. The soil shall <br />be plowed only when the moisture content of a fragment <br />eight (8) inches below the surface is below the plastic <br />limit. <br /> <br />Ce <br /> <br />In soils having percolation rates faster than fifteen <br />(15) minutes per inch (sandy loams) in the tcp eight (8) <br />inch depth, disking may be used for surface preparation <br />as a substitute for plowing. <br /> <br />Mound construction shall proceed immediately <br />surface preparation is completed. <br /> <br />after <br /> <br />The original soil must not be excavated or moved more <br />than one foot from its original location during soil <br />surface preparation. <br /> <br /> <br />