A Framework for Assessing Bioaccumulation and Exposure Risks of Per- and Polyfluoroalkyl Substances in Threatened and Endangered Species on Aqueous Film Forming Foam (AFFF)-Impacted Sites
Frank Gobas | Simon Fraser University
For several decades, the U.S. Department of Defense (DoD) widely used Aqueous Film Forming Foam (AFFF) formulations for training and operations related to fire suppression. These AFFF formulations contained relative high quantities of perfluorooctanesulfonic acid (PFOS), as well a range of other of per- and polyfluoroalkyl chemicals (PFASs), including polyfluoroalkyl compounds that are perfluoroalkyl acids (PFAA) precursors. The objective of this project is to develop a framework for conducting scientifically defensible risk assessments of PFASs in threatened and endangered species on AFFF-impacted sites. The project will highlight key governing factors, techniques and tools and knowledge gaps related to exposure assessment, ecological effects characterization and risk estimation of legacy PFASs present within AFFF-impacted sites. The results will aid future research efforts and risk assessment initiatives in this area.
This project will involve a comprehensive literature review, compilation and assessment of pertinent data, techniques and tools. A framework will be developed for exposure assessment, ecological effects characterization and risk estimation of PFASs in threatened and endangered species on AFFF-impacted sites. In addition to synthesis and assessment of compiled data, the work will involve testing and evaluation of various mechanistic models for simulating environmental fate, transport and bioaccumulation of PFASs.
This work will provide critical information related to exposure pathways, bioaccumulation and exposure risks of PFASs in threatened and endangered species. Development and demonstration of the framework will help to highlight key governing factors, techniques and tools and data gaps. The results will benefit future research efforts and risk assessment initiatives regarding legacy PFASs at AFFF-impacted sites. (Anticipated Completion - February 2019)