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There are two ways to define a source. It can be:
- The place where a stressor originates (for example, a
factory smokestack emitting a stressor such as sulfur dioxide).
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- A management practice or action that produces stressors (for
example, construction activities resulting in the release of fine
sediments into a stream).
If the original source has been removed, the source is considered
the current location of the stressors. For example, if an industrial
plant that produced contaminants has been demolished, the contaminated
sediments of the area might be considered a source.
Relevant
guidelines section(s): 4.2.1.1
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