Presented at the 2026 National Groundwater Association (NGWA) Conference – PFAS in the Age of Uncertainty
Lead Author: Matthew Spurlin, MS, CPG
Co-Authors: Trey Fortner, MS, Kostas Dovantzis, PhD, Sarah Ochranek, MS, Cassandra Sperow, MS, Michael Barba, MS
Objectives
Updated guidance is needed to incorporate best practices that minimize uncertainties in data collection and interpretation.
Should consider range of site conditions based on soil types and climate, and a more standardized set of best practices and tools.
The new tiered approach provides an updated framework for determining SSLs that will address an immediate need for technical direction in scoping and conducting the next phase of PFAS RIs.
In this presentation:
- Roadmap of Updated Approach
- Site-Specific Screening, Recharge & Mass Discharge Evaluations
- Guidelines for Lysimeter Investigations
- Guidelines for Data Modeling
- Data Collection Summary
- Soil Screening Level (SSL) Selection
- Data Gaps and Continued Research
- Next Steps