8.7.2.1.General Requirements

(1) A leaching bed shall not be located (a) in an area that has an average slope that exceeds one unit vertically to four units horizontally, (b) in soil or leaching bed fill having a percolation time of, (i) less than 1 min, or greater than 125 min if constructed as a shallow buried trench, or (ii) less than 1min, or greater than 50 min for all other leaching beds, or (c) in or on an area that is subject to flooding that may be expected to cause damage to the leaching bed or impair the operation of the leaching bed. (2) A leaching bed shall not be covered with any material having a hydraulic conductivity less than 0.01 m/day. (3) The surface of the leaching bed shall be shaped to shed water and together with the side slopes of any raised portion, shall be protected against erosion in such a manner as to not inhibit the evaporation and transpiration of waters from the soil or leaching bed fill, and to not cause plugging of the distribution pipe. (4) No part of a leaching bed shall be sloped steeper than 1 unit vertically to 4 units horizontally. (5) A leaching bed shall be designed to be protected from compaction or any stress or pressure that may result in, (a) the impairment or destruction of any pipe in the leaching bed, or (b) the smearing of the soil or leaching bed fill.