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I <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i <br /> <br />completed. A crawler or track-type tractor shall be used for mound <br />cons tn]ct 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 />Ail 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 fragmmnt 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 my be used for surface preparation as a <br />substitute for plowing. <br />Mound construction shall proceed immmdiately 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 minL~{~.e 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 (1-1/4) inch diameter perforated pipe under pressure from <br />a manifold. <br /> <br />15. Gravity distribution. <br /> <br />The four (4) inch distribution pipes shall be rigid plastic <br />with boles at least one-half (1/2) inch dieter spaced no <br />further than thirty-six (36) inches. One (1) row of holes <br />shall be laid at the bottom of the pipe. <br />The distribution pipe shall slope downward two (2) inches per <br />one hundred (100) feet away from the distribution box. <br />The far ends of the distribution pipe shall be connected. <br />The distribution pipes shall be spaced no further than five <br />(5) feet apart and no further than thirty (30) inches fr~n <br />the edge of the filter material. <br />The distribution pipes shall connect to the outlets of a <br />distribution box. <br /> <br />16. Pressure distribution. <br /> <br />- 19 - <br /> <br /> <br />