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I I I I I I I I I I I I I I I I I I I 15. Distribution of effluent over the filter material shall be one and one-fourth (1-114) 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 f1lter 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 atthe 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 f1ll 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. 28. A vertical inspection pipe at least 1-113 inches in diameter must be installed in each drainfIeld rock layer of every mound. The inspection pipe must have three-eighths inch or larger perforations spaced vertically no more than six inches apart. At least two perforations must be located in the rock layer. The inspection pipe must extend to the bottom of the rock layer and must be capped flush with or above fInishedfgrade. 30. A pump must be used as specifIed in this Chapter (Refer to Dosing Devices for Pressure Distributions). 150.01.4H. 2000 URBAN SERVICE AREA ALTERNATIVE. SUBDIVISION 1. GENERAL. 57