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- 20 - <br /> <br />15. Gravity distribution. <br /> <br />The four (4) inch distribution pipes shall be rigid plastic <br />with holes at least one-half (1/2) inch diameter 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 from <br />the edge of the filter material. <br />The distribution pipes shall connect to the outlets of a <br />distribution box. <br /> <br /> 16. The quantity of effluent per pump dose shall be at least one <br />hundred fifty (150) gallons per bedroom for dwellings. For other <br />establishments, the dose shall be at least twenty-five per cent (25%) of the <br />estimated or measured daily sewage flow. <br /> <br /> 17. At least two (2)inches of filter material shall be placed over the <br />lateral or distributon pipes. <br /> <br /> 18. Straw or marsh hay to an uncompacted depth of three (3) to four <br />(4) inches shall be placed over the filter material. <br /> <br /> 19. Construction vehicles shall not be allowed on the filter material <br />until backfill is placed. <br /> <br /> 20. Sandy loam soil shall be placed on the filter material to a depth <br />of one (1) foot in the center of the mound and to a depth of six (6) inches at <br />the sides. <br /> <br /> 21. A maximum of two (2) ten (10) foot wide beds may be installed side <br />by side in a single mound if the soil percolation rate is between five (5) and <br />sixty (60) minutes per inch to a depth of at least twenty-four (24) inches below <br />the sand layer. The beds shall be separated by four (4) feet of sand. <br /> <br /> 22. When two (2) beds are installed side by side, the sandy loam fill <br />at the center of the mound shall be eighteen (18) inches deep and six (6) inches <br />deep at the sides. <br /> <br /> 23. Six (6) inches of topsoil shall be placed on the fill material <br />over the entire area of the mound. <br /> <br /> 24. A vegetative cover shall be established over the entire area of <br />the mound, <br /> <br /> 25. No shrubs shall be planted on the top of the mound. Shrubs may be <br />placed at the foot and side slopes of the mound. <br /> <br /> 26. The side slopes on the mound shall be no steeper than three (3) to <br />one (1). <br /> <br /> <br />