South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-9 - Water Pollution Control Permits › Subchapter 61-9.503 - STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE › Part C - SURFACE DISPOSAL › Section 61-9.503.C.21 - Special definitions

Current through Register Vol. 48, No. 6, June 28, 2024
(a)
				  "Active sewage sludge unit" is a sewage sludge 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) "Contaminate an aquifer" means to
				  introduce a substance that causes the maximum contaminant level for nitrate in
				  40 CFR
				  141.62(b) or R.61-68 (Water
				  Classifications and Standards) to be exceeded in the 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
				  40 CFR
				  141.62(b) or R.61-68 (Water
				  Classifications and Standards).
(d)
				  "Cover" is soil or other material used to cover sewage sludge placed on an
				  active sewage sludge unit.
(e)
				  "Displacement" is the relative movement of any two sides of a fault measured in
				  any direction.
(f) "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.
(g) "Final cover" is the last layer of soil
				  or other material placed on a sewage sludge unit at closure.
(h) "Holocene time" is the most recent epoch
				  of the Quaternary period, extending from the end of the Pleistocene epoch to
				  the present.
(i) "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 sewage sludge unit.
(j) "Liner" is soil or synthetic material
				  that has a hydraulic conductivity of 1 × 107
				  centimeters per second or less.
(k)
				  "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.
(l)
				  "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.
(m) "Seismic impact zone"
				  is an area that has a 10 percent or greater probability that the horizontal
				  ground level acceleration of the rock in the area exceeds 0.10 gravity once in
				  250 years.
(n) "Sewage sludge unit"
				  is land on which only sewage sludge is placed for final disposal. This does not
				  include land on which sewage sludge is either stored or treated. Land does not
				  include waters of the State, as defined in R.61-9.122.2. Does not include
				  beneficial use activities covered under Part B, which comply with agronomic
				  rate requirements and metals limitations.
(o) "Sewage sludge unit boundary" is the
				  outermost perimeter of an active sewage sludge unit.
(p) "Surface disposal site" is an area of
				  land that contains one or more active sewage sludge units.
(q) "Unstable area" is land subject to
				  natural or human-induced forces that may damage the structural components of an
				  active sewage sludge unit. This includes, but is not limited to, land on which
				  the soils are subject to mass movement.