Laserfiche WebLink
PRESSURE DISTRIBUTION: <br />Effluent shall be distributed over the filter material by three 2 inch diameter perforated pipes <br />under pressure 73 feet long. Perforation holes shall be 7/32 inch diameter drilled in a straight <br />line along the length of the pipe. Hole spacing shall be 36 inch-.:, with 25 perforation per lateral. <br />Holes shall be drilled straight into the pipe and not at an angle. A sharp drill shall be used and <br />any burrs in the inside of the pipe shall be removed. The perforated pipe laterals shall be <br />installed level with the perforations downward. <br />The perforated pipe laterals shall be connected to a 2-inch diameter manifold pipe and shall have <br />their ends capped. The laterals shall be spaced 40 inches on center and at 20 inches from the <br />edge of the filter material. <br />The manifold pipe shall be connected to the supply pipe from the pump. The manifold shall be <br />sloped toward the supply pipe from the pipe. <br />Straw marsh hay to an un-compacted depth of 3 to 4 inches shall be placed over the filter <br />material. A layer of untreated building paper (red rosin) shall be placed over the hay or straw. <br />Geo-Textile material if approved by the City Building Inspector may also be used. <br />Construction vehicles shall not be allowed on the filter material until backfill is placed. <br />Sandy loam soil shall be placed on the filter material to. :pth of 12 inches in the center of the <br />mound and to a depth of 6 inches at the sides. <br />Six inches of topsoil shall be placed on the fill material over the entire area of the mound. A <br />grass cover shall be established over the entire area of the mound. No shrubs shall be planted <br />on the top of the mound. Shrubs may be placed at the foot and side slopes of the mound. <br />The side slopes of the mound will be 5 feet horizontal to 1 foot vertical (5:1). This gentle slope <br />will allow easy mowing of the grass cover. The soil material at the toc of the dike shoeld be <br />slightly less permeable or somewhat tighter than the natural soil below the mound. This can be <br />accomplished by selecting a finer soil or by compaction. <br />Whenever mounds are located on slopes, a diversion shall be constructed immediately up slope <br />from the mound to intercept and divert runoff. <br />PAGE 4 <br />