A. "Adjacent" to a wetland means bordering,
contiguous, neighboring, or hydrologically interconnected via surface water or
groundwater. Adjacent wetlands include, but are not limited to, those areas
that are separated from other waters of the State by man-made dikes, berms, or
barriers, natural river berms, and beach dunes. Areas hydrologically
interconnected are considered to be those where a realistic potential exists
for migration of a release or spill to an adjacent wetlands via surface water
means any ancillary equipment that is stationary to the unit and contains or
transports hazardous waste.
"Areas of complex hydrogeology" typically include, but are not limited to,
karst terrane; fractured rock formations (joints and faults; excludes healed
fractures) irregularly stratified geologic deposits (e.g., certain fluvial,
deltaic and barrier island deposits); mixed hydrogeologic regimes (e.g.,
sedimentary deposits overlying fractured crystalline bedrock); folded areas
where flow paths may be contorted, and recharge zones where background water
quality cannot be determined.
"Areas susceptible to mass movement" means those areas of influence (i.e.,
areas characterized as having an active or substantial possibility of mass
movement) where the movement of earth material at, beneath, adjacent, or in the
immediate area of the unit, because of natural or man-made events, results in
the downslope transport of soil and rock material by means of gravitational
influence. Areas of mass movement include, but are not limited to, landslides,
avalanches, debris slides and flows, creep, solifluction, liquefaction, block
sliding, rock fall, and slump.
"Braided" means a river system characterized by an intricate network of
dividing and reuniting channels (frequently more than one) around a network of
predominantly sand and gravel bars and islands, causing the river channels to
follow a sinuous rather than straight course.
F. "Cave" means a naturally occurring cavity,
recess, chamber, or series of chambers and galleries beneath the surface of the
G. "Class GA groundwater" is
defined in R.61-68 as those groundwaters that are characterized by either of
the following factors: the groundwater is irreplaceable because no reasonable
alternative source of drinking water is available to substantial populations,
or the groundwater is ecologically vital because it provides the base flow for
a particularly sensitive ecological system that, if polluted, would destroy a
H. "Coastal marine
floodplain" means the area along any coast that has historically been inundated
during times of flooding, but is otherwise above water, except for standing
water such as in a marsh or pond.
I. "Displacement" means the relative movement
of any two sides of a fault measured in any direction.
J. "Ephemeral" means a short-lived or
transitory river or portion of a river that flows only in direct response to
K. "Existing unit"
means a unit which has received a hazardous waste permit by the effective date
of this regulation or has met the requirements for interim status under
L. "Expansion or
Expanding unit" means any increase in the capacity of an existing unit, as
defined above, any change in the types of waste received by an existing unit,
any increase in the quantities of waste received by an existing unit on a
periodic basis, or the addition of a unit or units for the same activity as the
M. "Fault" means a
fracture or zone of fracturing in any material along which there has been an
observable amount of displacement of the sides relative to one another and
parallel to the fracture.
net" is a graph of flow lines and equipotential lines used in the study of
groundwater flow that represents two-dimensional movement through porous media.
Equivalent hydrogeologic models may be used in place of a flow net, subject to
the approval of the Department.
"Fluvial floodplain" means the area along any river or stream that has
historically been inundated during times of flooding, but is otherwise above
water, except for standing water such as in a marsh, pond, or oxbow
P. "Hazardous waste" means a
hazardous waste as defined in R.61-79.261 of the South Carolina Hazardous Waste
Management Regulations (SCHWMR).
"Historical migration zone" means the area within which erosion of coastal
marine, lacustrine or fluvial floodplains is predicted to occur within the next
25 years. The historical migration zone includes the following landforms:
coastal marine, lacustrine, and braided or meandering fluvial systems;
including ephemeral systems and local segments of other fluvial floodplains,
such as canaliform systems that are locally braided, locally meandering, or
R. "Holocene" means the
most recent geologic epoch within the Quaternary Period, from the end of the
Pleistocene epoch to the present.
S. "Horizontal ground acceleration" is the
change in velocity over time relative to horizontal movement of the earth's
surface as measured at a particular point during an earthquake.
T. "Karst terrane" means areas where
distinctive topography having characteristic surface and subterranean features
is developed because of liquefaction of overburden or the dissolution of
limestone, dolomite, or other soluble rock. Characteristic physiographic
features present in karst terrane include but are not limited to sinkholes,
closed depressions, sinking streams, caves, and blind valleys. Characteristic
subsurface solution features may be evidenced by drilling rod drops and fluid
loss during well drilling.
"Lacustrine floodplain" means the area along any lakeshore that has
historically been inundated during times of flooding, but is otherwise above
water, except for standing water such as in a marsh or pond.
V. "Land-based unit" means a unit which is
used for the treatment, storage, or disposal of a hazardous waste and is
subject to SectionR.61-79.264 Subpart F including surface impoundments,
landfills, waste piles, land treatment units. Units exempt from the Subpart F
requirements under 264.90(b) and covered indoor waste piles in compliance with
Section264.250(c)(c) shall be considered as non-land-based units.
W. "Locally" means a particular segment or
the reach of a river which is characterized by the distance that encompasses
several river bends or wave lengths, each being a minimum of eight or more
means a sinuous river system characterized by a single main channel that is
regionally characterized by a series of irregular "S" shaped curves.
Y. "Navigable waters" means those waters
which are now navigable, or have been navigable at any time, or are capable of
being rendered navigable by the removal of accidental obstructions, by rafts of
lumber or timber or by small pleasure or sport fishing boats.
Z. "New unit" means a unit, other than an
existing or expanding unit, as defined above, for which a permit decision will
be made after the effective date of this regulation.
AA. "Non-land-based unit" means an
incinerator, tank and its associated piping and underlying containment system,
or container storage area, and other units which are used for the treatment,
storage, or disposal of a hazardous waste and are not subject to
SectionR.61-79.264 Subpart F.
"One hundred-year flood" means a flood discharge that has a one-percent chance
of being equaled or exceeded in any given year.
CC. "One hundred-year floodplain" means any
land area which is subject to a one percent or greater chance of flooding in
any given year from any source.
"Poor foundation conditions" means those areas where features exist which
indicate that a natural or man-induced event may result in inadequate
foundation support for the structural components of a unit.
EE. "Post-closure activities" means those
regulated activities performed at a TSD unit after closure has been completed
and approved by the Department.
"Public drinking water supply" means water, whether bottled or piped, provided
to the public for human consumption; provided that the public drinking water
supply shall not include a drinking water system serving only a single private
residence or dwelling (R.61-58).
GG. "Recharge area" for a particular
saturated geologic unit is defined as areas where water enters the geologic
unit through downward migration. Principal examples include: outcrop areas of a
particular geologic unit where the potentiometric head within the unit
decreases with depth; and, in the subsurface, where the potentiometric head
relationship and leakage factors across any confining unit allow for downward
flow into a particular geologic unit.
HH. "Release" means any spilling, leaking,
pouring, emitting, emptying, discharging, injecting, pumping, escaping,
leaching, dumping, or disposing of hazardous waste or hazardous constituents
into the environment including the abandonment or discarding of containers,
barrels, and other closed or open receptacles containing hazardous waste or
Assessment" means a study consisting of Hazard Identification, Dose-Response
Assessment, Exposure Assessment and Risk Characterization. The study must
conform at least to the EPA Guidance:"Superfund Public Health Evaluation
Manual" EPA #540/1-86/06 October 1986 or more stringent guidelines as
established by the Department.
"Sole source aquifer" is defined as specified in the Federal Safe Drinking
integrity" means the ability of a unit to withstand physical forces exerted
upon designed components, appurtenances, and containment structures (e.g.,
liners, dikes) of the unit.
"Underground mine" means any subterranean excavation for minerals or ores
having a roof of undisturbed rock (as opposed to open-pit
MM. "Washout" means
the movement of hazardous waste from the unit as a result of a flood
NN. "Wetland(s)" means those
areas that are inundated or saturated by surface or groundwater at a frequency
and duration sufficient to support and under normal circumstances do support, a
prevalence of vegetation typically adapted for life in saturated soil
conditions. Wetlands must possess three essential characteristics: (1)
hydrophytic vegetation, (2) hydric soils, and (3) wetland hydrology.