1989.03.06 ORD 1989-256 - Laserfiche WebLink

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1 ( 1 ) Gravity distribution ' (a ) Four (4 ) inch distribution pipes shall be rigid plastic with one-half ( 1/2) inch minimum diameter holes spaced no further than thirty-six (36 ) inches apart. Pipe shall be placed with one ( 1 ) row of holes at the bottom of the pipe. ( b) Distribution pipe shall slope downward , two (2) inches per one hundred ( 100) feet away from the distribution box , spaced no further than five ( 5) feet apart and no further than thirty (30) inches from the edge of the filter material . (c ) The outer ends of the distribution pipe shall be connected ' (d ) Distribution pipes shall be connected to the outlets of a distribution box . (e) The quantity of effluentdelivered to the distribution system per pump dose shall be at least twenty-five (25) percent of the daily sewage flow. ( f ) Gravity distribution shall be permitted only where soils existing at the mound location have Percolation Rates of sixty (60) minutes per inch or faster. (2) Pressure distribution . ( a) Perforations shall be as required by Table I . Holes shall be cleanly drilled , straight into pipe, and not angled . ( b) Perforated pipe laterals shall be connected to a two (2) inch diameter manifold pipe, with ends capped . Laterals shall be spaced no more than forty (40) inches on center and no further than twenty (20) inches from the edge of the filter material . (c ) The perforated pipe laterals shall be installed level with perforations downward . (d ) Manifold pipe shall be connected to the supply pipe from the pump. Manifold shall be sloped downward toward the supply pipe. , d . A minimum of two (2) inches of filter material shall be � placed over the top of the laterals or distribution pipes. 32 2