Protocol for the Derivation of Environmental and Human ... - CCME

GGG
Guidelines: Generic numerical limits or narrative statements that are
recommended to protect and maintain the specified uses of
water, sediment, or soil, (refered to as criteria in previous
CCME publications).
Groundwater: Subsurface water beneath the water table in fully
saturated geologic formations.
HHH
Habitat: A particular type of environment inhabited by an organism.
Hazard: The adverse impact on health that can result from exposure to
a substance. The significance of the adverse effect depends on
the nature and severity of the exposure to the substance and the
degree to which the effect is reversible. In some instances, the
substance itself is also referred to as the hazard rather than the
adverse effect which the substance can cause.
Hazard identification: Identification of effects capable of adversely
affecting health as a result of exposure to a substance. Hazard
identification may involve case reports, toxicological studies,
epidemiological investigations, or structure/activity analysis.
Heterotroph: Organism that requires carbon in the organic form.
Hydraulic conductivity: The proportionality factor between hydraulic
gradient and flux in Darcy's Law. Hydraulic conductivity
measures the inherent ability of a porous medium to conduct
water.
LLL
LC 50 (Median lethal concentration): The concentration of chemical in
the medium that results in mortality to 50% of the test
organisms. The LC 50 is usually expressed as a time-dependent
variable (e.g., 96-hr LC 50 ). The LC 50 is normally statistically
derived through analysis of mortality data from all test
concentrations.
Leaching: The process by which contaminants in soil dissolve into
percolating water (e.g., rainfall) and are gradually removed from
the soil.
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