August 4, 2020

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Travis Kline and Dylan Eberle to Present on PFAS Risk Characterization at NGWA's Fate of PFAS: From Groundwater to Tap Water Conference

Travis Kline, MEM (Washington D.C.) and Dylan Eberle, Ph.D.(Massachusetts)will present at the National Ground Water Association's (NGWA) Fate of PFAS: From Groundwater to Tap Water Conference on August 12, 2020.

Travis will present "PFAS Health Exposure Assessment: Inconsistency and Challenges," and Dylan will present "Application of PFAS Forensic Techniques – Interpreting Data to Tell A Story."

Travis Kline is a Senior Principal Toxicologist based in Washington, D.C. with more than 25 years of experience focused on human health risk assessment and applied toxicology.

Dylan Eberle is a Scientist based in Massachusetts focused on site characterization, emerging contaminants, litigation support, and innovative remediation technologies.

This NGWA conference focuses on the fate and transport of per- and polyfluoroalkyl substances (PFAS) from contaminated sites through groundwater, surface water, and other environmental media to drinking water systems. The chemistry and environmental behavior of PFAS, as well as regulatory and toxicological evolution, create significant challenges for project planning, risk communication, and programmatic management. This conference will address hydrologic and environmental issues, as well as provide updates on regulations and toxicological studies and their effect on groundwater clean-up standards.

NGWA is a community of groundwater professionals working together to advance groundwater knowledge and the success of its members through education and outreach; advocacy; cooperation and information exchange; and enhancement of professional practices.

Presentation Descriptions

Title: PFAS Health Exposure Assessment: Inconsistency and Challenges
Presenter: Travis Kline, MEM
Time: 11:10 – 11:30 a.m., Wednesday, August 12, 2020
Description: This presentation will address characterization and remediation challenges in light of rapidly evolving scientific understanding and regulations at the state and federal level.

To date, the vast majority of efforts to characterize PFAS exposure have focused on drinking water ingestion. Methods are in development to help characterize the nature and extent of exposures via additional pathways (e.g., inhalation of ambient air, recreational exposures related to surface water contact and ingestion of recreationally caught fish, and ingestion of home-grown fruits and vegetables). As analytical methods develop, the limiting factors to inform effective characterization of current and potential future conditions become the lack of understanding regarding the driving pathways of concern and their significance based on the absence of applicable toxicity criteria.

This presentation characterizes the relative expected ranking of PFAS exposure pathways of concern based on a community-level exposure case-study, a consumer products exposure-based case study, inconsistency in the derivation of federal toxicity criteria and state compliance standards, the options for development of provisional toxicity factors, and methods to focus investigation needs, reduce project expenditures and inform defensible site and risk management.

Title: Application of PFAS Forensic Techniques – Interpreting Data to Tell A Story
Presenter: Dylan Eberle, Ph.D.
Time: 11:50 a.m. – 12:10 p.m., Wednesday, August 12, 2020
Description: Despite the ubiquity of per- and polyfluoroalkyl substances (PFAS) in the environment, the absolute and relative abundance of individual compounds in a sample can be utilized to identify distinct PFAS forensic signatures or "fingerprints". When put into the framework of a conceptual site model PFAS "fingerprints" may indicate the presence of a single or multiple PFAS source zones or indicate that detections are representative of an "anthropogenic baseline" that is not clearly linked to a specific source, process, or release. Given the pervasiveness of PFAS in commercial and industrial materials, such as polishes, waxes, paints, cleaning products, packaging, as well as in fill and construction debris, it is increasingly important to determine if detections of PFAS in the environment suggest a distinct on-site source, a distinct off-site source, or are indicative of local or regional diffuse non-point sources. This presentation will demonstrate how Geosyntec is currently using PFAS forensics to contextualize results and provide clients and regulators with valuable information. Case studies will be presented in which forensic techniques have been utilized to evaluate if the composition of PFAS detected in environmental media are indicative of a single source or multiple sources. This presentation will also demonstrate how effective communication of PFAS forensics to both clients and regulators is of critical importance when attempting to differentiate sources.

More Information

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For consultation regarding PFAS risk characterization contact Travis Kline at This email address is being protected from spambots. You need JavaScript enabled to view it. or This email address is being protected from spambots. You need JavaScript enabled to view it..
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