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

event or activity and leads to a specific numerical point estimate
or a range of values.
Risk management: The selection and implementation of a strategy for
control of a risk, followed by monitoring and evaluation of the
effectiveness of that strategy. The decision to select a particular
strategy may involve considering the information obtained during
risk assessment. Implementation typically involves a
commitment of resources and communication with affected
parties. Monitoring and evaluation may include environmental
sampling, post-remedial surveillance, prospective epidemiology,
and analysis of new health risk information, as well as ensuring
compliance.
Risk perception: An intuitive judgement about the nature and magnitude
of a risk. Perceptions of risk involve the judgements people
make when they characterize and evaluate hazardous
substances, activities, and situations.
Runoff: The portion of the total precipitation on an area that flows into
stream channels. Surface runoff does not enter the soil.
Groundwater runoff or seepage flow enters the soil before
reaching the stream.
SSS
Safety factor: A unitless numerical value applied to a reference
toxicological value (e.g., EC 50 ) to account for the uncertainty in
the estimate of a final soil quality guideline. Uncertainty factors
may be applied, for example, when there is a need for
extrapolation to long-term values from short-term data,
extrapolation from laboratory to field conditions, or to account
for inter- or intra-specific variation between individual test
organisms and species.
Sand: A soil particle between 0.05 and 2 mm in diameter.
Short-term exposure: A short-term exposure to a contaminant in a
medium and usually severe enough to rapidly induce an effect.
Often referred to as an acute exposure. Absolute definitions for
short-term exposure vary from study to study.
Silt: A soil particle between 0.002 and 0.05 mm in equivalent diameter.
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