What are the initial screening levels used for determining contaminants of concern?
DEQ has determined that an imminent and substantial endangerment to public health, safety, or welfare or the environment may exist if contaminant concentrations exceed certain risk-based screening levels. Contaminants of concern (COCs) are those contaminants whose concentrations exceed these risk-based screening levels, and therefore require additional evaluation. Contaminants whose concentrations fall below these screening levels will not typically trigger CECRA action.
