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ABOUT THE VIRTUAL TRAINING
DESCRIPTION
Reliable characterization, assessment and remediation of PFAS-contaminated sites is challenging. In Parts 1 and 2 of these presentations, we discussed the limitations of traditional, discrete sample data for final decision making and the need to transition more science- and risk-based “Decision Unit” and “Multi Increment Sample” (DU-MIS) investigation methods. Error associated with unavoidable, small-scale, random heterogeneity of contaminants in soil and other “infinite element” particulate matter can be controlled by the employment of sample collection, processing and testing methods in accordance with Gy’s Theory of Sampling. The challenge is amplified in the investigation of PFAS-contaminated soil and water due to the emerging realization that standard laboratory methods can fail to identify a significant fraction of PFAS-related compounds, particularly an ever-growing list of “precursor” and “ultrashort” compounds. Laboratories continue to expand their ability to identify and report these compounds. The utility of the resulting data is, however, largely negated by the lack of corresponding toxicity factors and risk-based screening levels. As a result, these compounds are often overlooked or simply ignored in assessment of risk and design of remedial actions.
Testing of samples using “Total Oxidizable Precursor (TOPs)” and “Total Organic Fluorine (TOF)” methods in conjunction with standard test methods offers one solution. Under this approach, “Total PFAS Risk” is assessed as the cumulative risk posed by three groupings of compounds:
- Risk posed by terminal endpoint PFAS compounds identified by initial analysis of the sample (“Pre-TOPs PFASs”)
- Risk posed by additional, precursor-related terminal endpoint PFAS generated by TOPs analysis of the sample (“Post-TOPs PFASs”)
- Risk posed yet additional, presumed PFAS-related compounds reflected by predicted versus measured concentration of TOF in the sample (Total PFAS Risk = Pre-TOPs PFAS Risk + Post-TOPs PFAS Risk + Excess Fluorine PFAS Risk)
While imperfect and still evolving, the Total PFAS Risk approach described offers a significant step forward in identifying and addressing the risk posed by these complex groups of chemicals in the environment. The combined use of DU-MIS investigation methods and assessment of Total PFAS Risk is demonstrated as a means to more efficiently and reliably investigate and remediate a fire training site contaminated by AFFF. Improved guidance on related topics that include assessment of PFAS leaching from soil and uptake into food crops and aquatic organisms is still urgently needed.
WHO SHOULD ATTEND
- Anyone involved with determining or investigating PFAS-contaminated sites
- Regulatory or policy decision-makers
- Inspectors, investigators, attorneys, laboratory personnel
- Those who manage or develop sampling plans or remediation of PFAS sites
DATE AND TIME:
April 24, 2024
Noon to 1:30 p.m. Eastern Standard Time
LOCATION: Live virtual training on Microsoft Teams.
AVAILABLE TO: Members of the Northeast Environmental Enforcement Project (NEEP) Southern Environmental Enforcement Network (SEEN) and Western States Project (WSP). There is no registration fee. This training is for government employees/officials only.
EVENT CAPACITY: There is no limit on the number of attendees.
REGISTRATION DEADLINE: April 19, 2024
LEVEL: Informational
INSTRUCTOR:
Roger Brewer is a senior environmental scientist with the Hawai’i Department of Health.
His environmental experience includes regulatory compliance audits; characterization of contaminated soil, water and air; contaminant fate and transport; vapor intrusion and human health and ecological risk assessment. Current areas of focus include the PFASs, the chemistry and toxicity of petroleum fuels and improved methods for the collection of representative, environmental samples. He has also worked as an environmental consultant in the US, Asia and South America and as a senior geologist and environmental risk assessment specialist for the California Environmental Protection Agency. His academic background includes a PhD in geology and post-doctoral research at Nanjing University in China.
Risk Based Site Investigation: Methods to Assess Total PFAS Risk
- Wednesday Apr 24 2024, 12:00 PM - 1:30 PM
-
Microsoft Teams Meeting
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