Practices to Identify and Mitigate PFAS Impacts on Highway Construction Projects and Maintenance Operations

By: National Academies of Sciences, Engineering, and Medicine and Transportation Research Board and National Cooperative Highway Research Program and Roy E. Sturgill Jr. and Joseph A. Charbonnet

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Synopsis: Per- and polyfluoroalkyl substances (PFAS) are a class of more than 6,000 contaminants of emerging concern that can harm both ecosystems and human health. These anthropogenic compounds contain carbon fluorine bonds that make them stable and persistent in the environment, earning them the nickname “forever chemicals.” NCHRP Synthesis 630: Practices to Identify and Mitigate PFAS Impacts on Highway Construction Projects and Maintenance Operations, from TRB’s National Cooperative Highway Research Program, documents current state departments of transportation practices for identifying locations of potential PFAS contamination and mitigating the impacts of PFAS related to highway construction and maintenance operations. This study considers PFAS impact and mitigation efforts in all phases of highway project development (planning, design, right-of-way acquisition), construction, and maintenance.