The goal of this project is to provide the information needed for proper management of aqueous film-forming foam (AFFF)-impacted portland cement concrete pavement, asphalt pavement, and demolished pavements of both types (debris stockpiles). The specific objectives include: (1) assessing the leachability of per- and polyfluoroalkyl substances (PFAS) from asphalt pavement, concrete pavement, and pavement demolition debris sampled from sites with historic AFFF use; and (2) examining how PFAS leachability from pavement is affected by AFFF dosage and formulation, exposure time, pavement properties, and weathering.

A combination of well-established leaching tests and state-of-the-art PFAS analysis will be used to provide key information regarding the fate and transport of PFAS from AFFF-impacted paved surfaces and pavement debris. Multiple leaching methodologies will be performed on pavement samples collected from DoD (or similar) facilities and pavement specimens produced in the laboratory and dosed with AFFF.

The following tasks will be conducted: (1) collection and PFAS leaching tests of pavement cores and pavement debris from at least six Department of Defense (DoD) sites (or similar) with known sources of AFFF-impacted pavement; and (2) batch and dynamic PFAS leaching tests of laboratory-created pavements that have been exposed to varying doses and types of AFFF, as well as different exposure times, pavement conditions, and weathering.

This project will provide the data necessary to make informed decisions regarding the management of facilities with AFFF-impacted pavement. The data and the accompanying modeling and risk assessment will allow facility decisionmakers to assess the likely degree of PFAS migration from existing paved surfaces and to make better informed choices regarding the management of debris resulting from AFFF-impacted pavement. (Anticipated Project Completion - 2025)