Risk Assessment of Per- and Polyfluoroalkyl Substances in Support of Brownfield Redevelopment
Thursday, June 20, 2019: 2:35 p.m.
Krista Barfoot, Ph.D., C.Chem., QPRA
,
Jacobs, Kitchener, ON, Canada
Henry Yee, M.Env.Sc., C.Chem., QPRA
,
Jacobs, Toronto, ON, Canada
Brandi Wilson, B.Sc.
,
Jacobs, Kitchener, ON, Canada
Investigation of per- and polyfluoroalkyl substances (PFAS) to date has largely focused on manufacturing sites and fire training areas (due to use of aqueous film-forming foam [AFFF]); however, consideration of the presence and potential risks associated with PFAS is now expanding to waste management (e.g., landfill leachate and biosolids) and brownfield redevelopment. The potential presence of PFAS at brownfield sites has implications for their redevelopment as evaluating the associated risks, and processing the sites through applicable regulatory frameworks, is largely undefined. While research, data, and information are evolving quickly on PFAS toxicology and the fate and transport of these parameters in the environment, regulatory screening values and risk assessment (RA) approaches are lagging.
This presentation will examine the approach by which human health and ecological risk assessment can be completed for a brownfield site where AFFF was applied during a fire. The review will outline the screening levels and toxicity values that may be applied to support the RA, as well as the conceptual human health and ecological exposure models needed to complete risk evaluations. By stepping through the RA process for a site, a viable framework for assessing and addressing PFAS at brownfield sites can be established.
Krista Barfoot, Ph.D., C.Chem., QPRA, Jacobs, Kitchener, ON, Canada
Krista Barfoot is a Principal Brownfield Technologist with over 23 years of industry experience. She is a Qualified Person for Risk Assessment under Ontario Regulation 153/04, the Chair of the Ontario Environmental Industry Association (ONEIA) Brownfields Committee, a member of ONEIA’s Excess Soils Sub-Committee, and a Board Member for the Canadian Brownfields Network. Dr. Barfoot’s technical expertise includes human health risk assessment, vapour intrusion, management of excess soil, non-aqueous phase liquid (NAPL), risk mitigation measures, and stakeholder communication. She is actively leading the development of the strategic approach for revitalizing several large, high-profile brownfield sites in Ontario.
Henry Yee, M.Env.Sc., C.Chem., QPRA, Jacobs, Toronto, ON, Canada
Henry Yee is a Senior Risk Assessor with more than 8 years of experience in the areas of toxicology, human health risk assessment (HHRA) and ecological risk assessment (ERA). He has conducted HHRAs and ERAs for contaminated sites across Canada, proposed and abandoned mine sites, proposed steam-assisted gravity drainage oil sands projects, and proposed energy-from-waste facilities. He is experienced with each aspect of HHRA and ERA, including problem formulation, exposure and toxicity assessment, risk characterization, and derivation of site-specific target/remediation levels. He has also provided RA model and regulatory guideline development support to Canadian government agencies.
Brandi Wilson, B.Sc., Jacobs, Kitchener, ON, Canada
Brandi Wilson is a junior environmental scientist several years of experience in the environmental consulting industry. Her areas of expertise include environmental site assessment (ESA) (including Phase One and Two ESAs), risk assessment (RA), and field investigation activities, including sediment sampling, groundwater sampling, and air emission source confirmation.
