Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 15 - USE OF SURFACE DISPOSAL OF BIOSOLIDS, APP. A-C › Part C - SURFACE DISPOSAL › Section 21 - Special definitions

Current through July 13, 2024
(a) "Active
				  biosolids unit" is a biosolids unit that has not closed.
(b) "Aquifer" is a geologic formation, group
				  of geologic formations, or a portion of a geologic formation capable of
				  yielding ground water to wells or springs.
(c) "Biosolids unit" is land on which only
				  biosolids are placed for final disposal. This does not include land on which
				  biosolids are either stored or treated. Land does not include waters of the
				  state, as defined in
				  W.S.
				  35-11-103 ( c ) (vi ).
(d) "Biosolids unit boundary" is the
				  outermost perimeter of an active biosolids unit.
(e) "Contaminate an aquifer" means to
				  introduce a substance that causes the maximum contaminant level for nitrate in
				  Chapter 8, Wyoming Water Quality Rules and Regulations to be exceeded in ground
				  water or that causes the existing concentration of nitrate in ground water to
				  increase when the existing concentration of nitrate in the ground water exceeds
				  the maximum contaminant level for nitrate in Chapter 8, Wyoming Water Quality
				  Rules and Regulations.
(f) "Cover"
				  is soil or other material used to cover biosolids placed on an active biosolids
				  unit.
(g) "Displacement" is the
				  relative movement of any two sides of a fault measured in any
				  direction.
(h) "Fault" is a
				  fracture or zone of fractures in any materials along which strata on one side
				  are displaced with respect to strata on the other side.
(i) "Final cover" is the last layer of soil
				  or other material placed on a biosolids unit at closure.
(j) "Holocene time" is the most recent epoch
				  of the Quaternary period, extending from the end of the Pleistocene epoch to
				  the present.
(k) "Leachate
				  collection system" is a system or device installed immediately above a liner
				  that is designed, constructed, maintained, and operated to collect and remove
				  leachate from a biosolids unit.
(l)
				  "Liner" is soil or synthetic material that has a hydraulic conductivity of 1 x
				  10-7 centimeters per second or less.
(m) "Lower explosive limit for methane gas"
				  is the lowest percentage of methane gas in air, by volume, that propagates a
				  flame at 25 degrees Celsius and atmospheric pressure.
(n) "Qualified ground water scientist" is an
				  individual with a baccalaureate or post-graduate degree in the natural sciences
				  or engineering who has sufficient training and experience in ground water
				  hydrology and related fields, as may be demonstrated by State registration,
				  professional certification, or completion of accredited university programs, to
				  make sound professional judgments regarding ground water monitoring, pollutant
				  fate and transport, and corrective action.
(o) "Seismic impact zone" is an area that has
				  a ten percent (10%) or greater probability that the horizontal ground level
				  acceleration of the rock in the area exceeds 0.10 gravity once in 250
				  years.
(p) "Surface disposal site"
				  is an area of land that contains one or more active biosolids units.
(q) "Unstable area" is land subject to
				  natural or human-induced forces that may damage the structural components of an
				  active biosolids unit. This includes, but is not limited to, land on which the
				  soils are subject to mass movement.