Minor Amendment-MUSA Expansion Requests

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52 I I I I I I I I I I I I I I I I I I I 1 2. Soil Surface Preparation. a All vegetation in excess of four inches in length and dead organic debris must be removed from the surface of the total area selected for the mound, including the area under the banks. b. The total area selected for the mound, including the dikes, shall be plowed to a depth of at least eight (8) inches. Furrows shall run perpendicular to the direction of slopes. All furrows shall be thrown uphill and there shall be no deadfurrow under the mound. The soil shall be plowed only when the moisture content of a fragment eight (8) inches below the surface is below the plastic limit. c. In soils having percolation rates faster than fifteen (15) minutes per inch (sandy loams) in the top eight (8) inch depth, disking may be used for surface preparation as a substitute for plowing. d. Mound construction shall proceed immediately after surface preparation is completed. e. The original soil must not be excavated or moved more than one foot from its original location during soil surface preparation. 1 3. A minimum of twelve (12) inches of soil defined as sand shall be placed where the filter material is to be located. A crawler tractor with a blade shall be used to move the sand into place. At least six (6) inches of sand shall be kept under the tracks to minimize compaction of the plowed layer. The sand layer upon which the filter material is placed shall be level. 14. depth of at least nine (9) inches of filter material shall be placed over the bed area below the distribution pipe. 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. 1 6. 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. 1 7. 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. 1 9. 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.