2002-P05601 - new septic system - Laserfiche WebLink

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SITE EVALUATION REPORT For Peterson Property Sewage Treatment System Page 3 up slope and shall run perpendicular to the slope. There shall be no dead furrow under the mound. Disking 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 excavated and removed from the area. Mound Construction shall proceed immediately after surface preparation is completed. Every effort should be taken to prevent rain from falling on the prepared soil surface. CONSTRUCTION MATERIALS AND PROCEDURES;DISTRIBUTION OF EFFLUENT: A minimum of 12 inches of soil defined as sand shall be placed where the filter material is to be located. A crawler tractor with a blade or bucket shall be used to move the sand into place. At least 6 inches of sand shall be kept under the tracks to minimize compacting of the plowed layer. The sand layer upon which the filter material is placed shall be level. Sand is defined as a soil texture 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) shall 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- resistant material free from dust, sand, silt or clay. The size shall range from 3/4 inch diameter to 2 '/2 inch diameter. PRESSURE DISTRIBUTION: Effluent shall be distributed over the filter material by three 1 'h 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 of the pipe. Hole spacing shall be 30 inches with 30 perforation per lateral. Holes shall be drilled straight into 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 shall 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.