No, human exposures can be considered "under control" if adequately protective controls are in place to prevent unacceptable exposures (i.e., cut pathways between humans and contamination) for the reasonably-expected worst-case conditions (in the un-investigated areas).
For more information, see http://www.epa.gov/epawaste/hazard/correctiveaction/eis/index.htm.
Is it necessary to complete an entire site investigation to show that human exposures are under control?
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