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] ] ] ] ] ] ] ] .] .] .] ] ] § 8.30 Distribution Pipes are perforated pipes or agricultural drain files that are used to distribute sewage t~nk elWluent in a soil treatment system. Perforated pipe used for distribution pipes shall have one or more rows of holes of no more than 1/2-inch in diameter spaced no more than 36 Lnches apart. Holes shall be spaced to prevent beachff capa~ty of not less tB~n 800 pounds per linear foot. ~Ylstzibufion ])evice is a device which is used to distribute sewage tank effluent to the distribufion pipes, including but not limited to distribution boxes, drop. boxes, and valve boxes. Dosing Ch-tuber (or p;:mp pit or wet well) is a tank or separate compart, ment following the sewage tank which serves as a reservoir for the doing device. Drainfielcl is also called tile disposal field or soil absorption field and uses distribution pipes placed in favorable soil so that sewage from the septic tank can percolate through and into the soil. Dwelling is any builrt~ng or place used or intended to be used by h~man occupants as a single-family or two-fsm~]y Filter 1VIaterial is cle~n rock, crushed igneous rock, or similar insoluble, durable, and decay-resist~nt material free from dust, sand, silt, or clay. The size sha~! range from 1.25-inch minim~m diameter to 2.5 inches effective diameter. Holding T~lr is a watertight tank for storage of sewage until it can be transported to a point of approved disposal. Impermeable, with regards to soils, is a soil horizon or layer ha~ing a vertical permeability less than 1-inch in 24 hours and shall be considered impermeable.' Individual Sewage Treaimenl~ System is a sewage treatment system, or part thereof, serving a dwe]Ung or other small L~ving or business ~t, or group thereof, which utilizes subsurface soil treatment and disposal. Law-Ix Area is the area bounded by the dimensions required for the proper location of the soil treatment area. Mottling is a zone of chemical oxidation and reduction actixdty appearing as splotchy patches of red, brown, orange and gray. Mound System is a system where the soil treatment area is built above the gro,~Dd to overcome ]~rn~ts imposed by pro~m~t-y to water table or bedrock, or by rapidly or slowly permeable soils. PercSl'a~ion l:Late is the time rate of drop of a water surface in a test hole as specified in §8.30.04 Subd.6 (Final Treatment And Disposal Standard System) of this chapter. Plastic Limit is soil moisture content below which the soil may be mamJpulated for purposes of installing a soil treatment system and above which manipulation will Cause compaction amd puddling. If a fragment of soil can easily Printed 12/28,/90 Page 237