What does the NFSS groundwater model show?
The model predicts that uranium isotopes (U-234, U-235, and U-238), cis-1,2-dichloroethene, and vinyl chloride will exceed screening levels in the lower water bearing zone on the NFSS property after 1,000 years. Additionally, U-238 and U-235 are predicted to exceed background levels at the property boundary after 1,000 years. To make the model more conservative, the contaminant-transport components of the overall modeling effort were designed to ensure that site constituents were mobile and provided indications of off-site exposure areas.
