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15. Distribution of effluent over the filter material shall be one and one-fourth (1-1/4) inch,diameter perforated pipe under pressure from a manifold.' 16. The quantity of effluent per pump dose shall be at least one hundred fifty (150) gallons per bedroom for dwellings. For other establishments, the dose shall be at least twenty-five per cent (25%) of the estimated or measured daily sewage flow. 17. At least two (2) inches of filter material shall be placed over the distribution pipes. The top of the filter material shall be level in all directions. 18. straw or marsh hay to an uncompacted depth four ( 4) inches shall be placed over the filter material. 19. Construction vehicles shall not be allowed on the filter material until backfill is placed. 20. Sandy loam soil shall be placed on the filter material to a depth of one (1) foot in the center of the mound and to a depth of six (6) inches at the sides. 21. A maximum of two (2) ten (10) foot wide beds may be installed side by side in a single mound if the soil percolation rate is between five (5) and sixty (60) minutes per inch to a depth of at least twenty-four (24) inches below the sandy layer. The beds shall be separated by four (4) feet of clean sand. 22. When two (2) beds are installed side by side, the sandy loam fill at the center of the mound shall be eighteen (18) inches deep and six (6) inches deep at the sides. 23. six (6) inches shall be placed on the fill material over the entire area of the mound. 24. A grass cover shall be established over the entire area of the mound. 25. No shrubs shall be planted on the top of the mound. Shrubs may be placed at the foot and side slopes of the mound. 26. The side slopes on the mound shall be no steeper than three (3) to one (1). 27. Whenever mounds are located on slopes, a diversion shall be constructed immediately upslope from the mound to intercept and direct runoff. 11