Background Level 02
Background Level 02 :
(1) The concentration of a substance in an environmental media (air, water, or soil) that occurs naturally or is not the result of human activities. (2) In exposure assessment the concentration of a substance in a defined control area, during a fixed period of time before, during, or after a data-gathering operation. media Specific environments--air, water, soil--which are the subject of regulatory concern and activities
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