What are the findings of the NFSS BRA under future exposure scenarios?
The future exposure scenarios evaluated risks to a wide variety of future human receptors including trespassers/recreational users, maintenance workers, construction workers, industrial workers, residents, and subsistence farmers. The baseline human health risk assessment concluded that the following list of chemicals and radionuclides posed an unacceptable risk under at least one of the exposure scenarios. These are defined as chemicals or radionuclides of concern, and so will be carried forward to the feasibility study for development of remedial action objectives. Media Chemicals of Concern (COCs) Radionuclides of Concern (ROCs) Soil Poly cyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), metals (including arsenic, boron, and lead), and pesticides in several localized areas on site. Isotopes (and some decay products) of radium, thorium, uranium, as well as cesium. Radium-226 is a risk driver throughout the site. Ground Water Chlorinated solvents (including tetrac
