2002-P05752 - new septic system - Laserfiche WebLink

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REVISED SITE EVALUATION REPORT for Lot 2,Block 1,Kokesh Farm Sewage Treatment System Page 3 Disking may be used for surface preparation as a substitute for mold board plowing in soils havin� percolation ra.tes 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 la.yers. In no case shall any surface soil be excavated and removed from the area. Mound Construction shall proceed immediately after�u�ce preparation is completed. Every effort should be taken to prevent rain from falling on the prepared soil surface. �ONSTRUCTION MA Ri T.��N�pR0 EDURFS;DISTR1BiJTION OF�FFL�LTFNT• 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'urto place. At least 6 inches of sand shall be kept under the tracks to minunize compacting of the plowed layer. The sand layer upon which the filter material is placed shall be level. Sand is defined as a soil te�rture 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 maxerial 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 21/Z inch diameter. PRESSURE DISTRIBUTION: Ef�luent sha11 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 30 perforaxion per lateral. Holes shall be drilled straight =�to 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 perfora.ted pipe laterals shall be connected to a 2 inch diameter manifold pipe and sha11 have their ends capped. The laterals sha.11 be spaced 40 inches on center and at 20 inches from the edge of the filter material. The manifold pipe sha11 be connected to the supply pipe from the pump. The manifold sha11 be sloped toward the supply pipe from the pipe. Geo-Textile material shall be placed over the filter material. Construction vehicles shall not be allowed on the filter material until bacldll is placed.