Septic design-2001 - Laserfiche WebLink

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REVISED SITE EVALUATION REPORT for Lot 4,Block 1, Kokesh Fa.rm Sewage Treatment System Page 3 Diskin� may be used for surface preparation as a substitute for mold board plowing in soils having percolation rates faster than 15 minutes per inch(sandy loam)in the top 8 inch depth. Back hoe teeth may be used to roughen the soil surface and break up the sod layer. Care must be taken so as not to compact or puddle deeper soil layers. In no case shall any surface soil be exc�vated and removed from the area. Mound Construction shall proceed immediately after surface prepazation is completed. Every effort should be taken to prevent rain from falling on the prepared soil surface. (�ONSTRUCTION 1VLA'i'FR,LAi S �ND PROC'EDi7RF�;DISTRi�3iTTION OF EFFLUENT� A minimum of 12 inches of soil defined as sand shall be placed where the filter material is to be located. A crawrle,�ttactor with a blade or bucket shall be used to move the sand irno place. At least 6 inches of sand shall be kept under the tra�ccks to minunize compacting of the plowed layer. The sand layer upon which the filter material is plac� sha11 be level. Sand is defined as a soil te3cture composed by weight of a least 25 percent of very coarse and medium sand, varying in size from 2.0 to 0.25 mm, less than 50 percent of fine or very fine sand ranging in size between 0.25 and 0.05 mm, and no more that 10 percent of particles smaller that 0.05 mm. A minimum depth of 9 inches of filter material (rock) sha11 be placed on the sand layer prior to installing the distribution pipe. Filter material is defined as clean rock, crushed igneous rock or similar insoluble, durable and decay- resistarn material free from dust, sand,silt or clay. The size shall range from 3/4 inch diameter to 2 '/Z inch diameter. PRESSURE DISTRIBiJ'TION: Effluent shall be distributed over the filter material by three 1 1/2 inch diameter perforated pipes under pressure 72.5 feet long. Perforation holes shall be 1/4 inch diameter drilled in a straight line along the length ofthe pipe. Hole spacing shall be 30 inches with 24 perforation per lateral. Holes sha11 be drilled straight urto the pipe and not at an angle. A sharp drill shall be used and any burrs in the inside of the pipe shall be removed. The perforated pipe laterals shall be installed level with the perforations downward. The perforated pipe laterals shall be connected to a 2 inch diameter manifold pipe and shall have their ends capped. The laterals sha11 be spaced 40 inches on center and at 20 inches from the edge of the filter material. The manifold pipe shall be connected to the supply pipe from the pump. The manifold shall be sloped toward the supply pipe from the pipe. Geo-Textile material shall be placed over the filter material. Construction vehicles sha11 not be allowed on the filter material until backfill is placed.