124 Neb. Admin. Code, ch. 1, § 084
"Soil absorption system" means a drainfield, leaching area, or seepage bed, including the effluent application or distribution system used for the soil based dispersal and treatment of wastewater or effluent. The soil absorption system includes the infiltrative soil surface in the absorption trench, the undisturbed soil between and around the trenches, and a final cover of suitable soil to stabilize the completed installation, support vegetative growth and shed runoff. The soil absorption system is the part of the onsite wastewater treatment system that uses the soil to further treat and dispose of effluent from the onsite wastewater treatment system in a manner that does not result in a point source discharge and does not create a nuisance, health hazard, or ground or surface water pollution.
124 Neb. Admin. Code, ch. 1, § 084