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- 19 - <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 sand 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. Th~ bottom arm~ of the filter material shall be sized on the basis <br />of two hundred (200) square feet per bedroom or eight-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 />completed. A crawler or track-type tractor shall be used for mound <br />construct ion. <br /> <br /> 10. The discharge pipe from the pump to the mound area shall be <br />installed prior to soil surface preparation. The trench shall be carefully <br />backfilled and compacted to prevent seepage of effluent. <br /> <br />11. Soil surface preparation. <br /> <br />The total area selected for the mound, including the dikes, <br />shall be plowed to a depth of at least eight (8)inches. <br />Furrows shall run perpendicular to the direction of slopes. <br />All furrows shall be thrown uphill and there shall be no <br />deadfurrow under the mound. The soil shall be plowed only <br />when the moisture content of a fragment eight (8) inches <br />below the surface is below the plastic limit. <br />In soils having percolation rates faster than fifteen (15) <br />minutes per inch (sandy loams) in the top eight (8) inch <br />depth, disking may be used for surface preparation as a <br />substitute for plowing. <br />Mound construction shall proceed immediately after surface <br />preparation is completed. <br /> <br /> 12. A minimum of twelve (12) inches of soil defined as sand shall be <br />placed where the filter material is to be located. A crawler tractor with a <br />blade shall be used to move the sand into place. At least six (6) inches of <br />sand shall be kept under the tracks to minimize compaction of the plowed layer. <br />The sand layer upon which the filter material is placed shall be level. <br /> <br /> 13. A depth of at least nine (9) inches of filter material shall be <br />placed over the bed area below the distribution pipe. <br /> <br /> 14. Distribution of effluent over the filter material shall be either <br />by four (4) inch distribution pipes with gravity flow from a distribution box or <br />by one and one-fourth (1/4) inch diameter perforated pipe under pressure from a <br />manifold. <br /> <br /> <br />