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9.0 SUBSURFACE DISPERSAL FIELD 9.1 Location of the dispersal field should be in an unobstructed and unshaded area. The minimum setbacks shall comply with the requirements of Section 1. 9.2 A leach line consists of a trench, filter material or rock -less chambers, a perforated pipe, filter protecting fabric, paper, or straw, and soil cover. 9.3 Where leach lines or seepage pits are installed, a watertight distribution box of sufficient size to accommodate the necessary field lateral lines shall be constructed at the head of each dispersal field with watertight inlet and outlets. 9.3.1 Each field lateral line shall be connected separately to a distribution box, shall not be subdivided, and shall provide equal distribution. Equal distribution is not required for repairs. 9.3.2 The invert of all outlets shall be level. The inlet invert shall be at least two (2) inches above the outlet. 9.3.3 The distribution box shall have a minimum inside dimension of twelve (12) inches and be at least twelve (12) inches deep with a solid impervious bottom. 9.3.4 A five (5) foot ABS Schedule 40 or equivalent tight line with a continuous soil barrier shall be installed between the septic tank, the distribution box and leach line. 9.4 Leach lines in the dispersal field shall be of the same width and shall meet the following: 9.4.1 Maximum length of individual leach line 100' 9.4.2 Minimum width of trench 24" 9.4.3 Maximum grade of perforated pipe 3" per 100' 9.4.4 Preferable grade of perforated pipe 2" per 100' 9.4.5 Distance between leach line 10' edge to edge 9.4.6 Minimum depth of rock below perforated pipe 12" 9.4.7 Minimum depth of rock over approved Perforated pipe 21.' 9.4.8 Maximum depth of trench 42" 9.4.9 Minimum distance between leach line and septic tank 5' 9.4.10 Maximum soil cover over leach line 24" 9.4.11 Minimum soil cover over leach line 6" Z_YLl EHD 42-014 Page 26 of 40 OWTS Standards 1/2017