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6. Mounds shall not be located on natural slopes exceeding 12 percent <br />under any soil percolation rate conditions. <br /> <br /> 7. The bottom area of the filter material shall be sized on the basis <br />of 200 square feet per bedroom or 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 single bed <br />exceed ten feet. <br /> <br /> 9. A rubber tired tractor may be used for plowing or disking but in no <br />case shall a rubber tired tractor be used after the surface preparation is completed. <br />A crawler or track-type tractor shall be used for mound construction. <br /> <br /> 10. The dischar§e pipe from the pump to the mound area shall be installed <br />prior to soil surface preparation. The trench shall be carefully backfilled and <br />compacted to prevent seepage of effluent. <br /> <br />II. Soil surface preparation. <br /> <br /> (a) The total area selected for the mound, including the dikes shall be <br />plowed to a depth of at least eight inches. Furrows shall run perpendicular to <br />the direction of slopes. All furrows shall be thrown uphill and there shall be <br />no deadfurrovl under the mound. The soil shall be plowed only when the moisture <br />content of a fragment eight inches below the surface is below the plastic limit. <br /> <br /> (b) In soils having percolation rates faster than 15 minutes per inch <br />(sandy loams) in the top eight-inch depth, disking may be used for surface <br />preparation as a substitute for plowing. <br /> <br /> (c) Mound construction shall proceed immediately after surface preparation <br />is completed. <br /> <br /> 12. A minimum of twelve inches of soil defined as sand shall be placed where <br />the filter material is to be located. A crawler tractor with a blade shall be used <br />to move the sand into place. At least six inches of sand shall be kept under the <br />tracks to minimize compaction of the plowed layer. The sand layer upon which the <br />filter material is ~laced shall be level. <br /> <br /> 13. A depth of at least nine inches of filter material shall be placed over <br />the bed area below the distribution pipe. <br /> <br /> 14. Distribution of effluent over the filter material shall be either by <br />four-inch distribution pipes with gravity flow from a distribution box or by one <br />and one-fourth inch diameter perforated pipe under pressure from a manifold° <br /> <br />19 <br /> <br /> <br />