R 299.4409 Definitions.

Rule 409. As used in this part: (a) "Airport" means a public-use airport that is open to the public without prior permission and without restrictions within the physical capacities of available facilities. (b) "Appendix II constituents" or "constituents listed in appendix II" means the constituents listed in the provisions of 40 C.F.R. part 258, appendix II. The provisions of 40 C.F.R. part 258, appendix II, are adopted by reference in R 299.4134. (c) "Areas susceptible to mass movement" means those areas that are characterized as having an active or substantial possibility of mass movement where the movement of earth material at, beneath, or adjacent to the landfill unit, because of natural or man-induced events, results in the downslope transport of soil and rock material by means of gravitational influence. Areas of mass movement include any of the following: (i) Landslides. (ii) Avalanches. (iii) Debris. (iv) Slides and flows. (v) Soil fluctuation. (vi) Block sliding. (vii) Rock fall. (d) "Bird hazard" means an increase in the likelihood of bird/aircraft collisions that may cause damage to the aircraft or injury to its occupants. (e) "Displacement" means the relative movement of any 2 sides of a fault measured in any direction. (f) "Fault" means a fracture or a zone of fractures in any material along which strata on one side have been displaced with respect to that on the other side. (g) "Federal clean water act" means Public Law 92-500, 33 U.S.C. S1251 et seq. (h) "Federal endangered species act" means Public Law 93-205, 87 U.S.C. S884 et seq. (i) "Federal marine protection, research and sanctuary act of 1972" means Public Law 92-532, 16 U.S.C. S1431 et seq., as amended. (j) "Gas condensate" means the liquid that is generated as a result of a gas recovery process at a type II landfill unit. (k) "Holocene" means the most recent epoch of the quaternary period that extends from the end of the pleistocene epoch to the present. (l) "Karst terranes" means areas where karst topography, with its characteristic surface and subterranean features, is developed as the result of the dissolution of limestone, dolomite, or other soluble rock. Characteristic physiographic features present in karst terranes include all of the following: (i) Sinkholes. (ii) Sinking streams. (iii) Caves. (iv) Large springs. (v) Blind valleys. (m) "Lithified earth material" means all rock and includes all naturally occurring and naturally formed aggregates or masses of minerals or small particles of older rock that formed by the crystallization of magma or by the induration of loose sediments. This term does not include man-made materials, such as fill, concrete, and asphalt, or unconsolidated earth materials, soil, or regolith that lies at or near the earth's surface. (n) "Lower explosive limit" means the lowest percent by volume of a mixture of explosive gases in air that will propagate a flame at 25 degrees Celsius and atmospheric pressure. (o) "Maximum horizontal acceleration in lithified earth material" means the maximum expected horizontal acceleration that is depicted on a seismic hazard map, with a 90% or greater probability that the acceleration will not be exceeded in 250 years, or the maximum expected horizontal acceleration based on a site-specific seismic risk assessment. (p) "Poor foundation conditions" means those areas where features exist which indicate that a natural or man-induced event may result in inadequate foundation support of the structural components of a type II landfill. (q) "Seismic impact zone" means an area for which there is a 10% or greater probability that the maximum horizontal acceleration in lithified earth material, expressed as a percentage of the earth's gravitational pull, will be more than 0.10G in 250 years. (r) "Structural components" means liners, leachate collection systems, final covers, runon and runoff systems, and any other component which is used in the construction and operation of a type II landfill and which is necessary for the protection of human health and the environment. (s) "Unstable area" means a location that is susceptible to natural or human-induced events or forces which are capable of impairing the integrity of some or all of the landfill structural components that are responsible for preventing releases from a landfill. Unstable areas can include poor foundation conditions, areas that are susceptible to mass movements, and karst terranes. (t) "Washout" means the carrying away of solid waste by waters of the base flood.