December 16, 2025

Lauren Asfour welcomed attendees, introduced herself and co-chair Neil Mullan, and reiterated the committee’s mission: fostering collaboration and education around aggregate recycling, end markets, and related operations. She highlighted the agenda—a presentation on PFAS in recycled aggregates by Dr. Tim Townsend and his graduate students from the University of Florida.

Presentation Overview

Dr. Townsend explained that PFAS (per- and polyfluoroalkyl substances) are a large class of man-made chemicals—over 10,000 compounds—known for properties like thermal stability and water resistance. These chemicals are widely used in consumer and industrial products (e.g., nonstick cookware, waterproof clothing) but persist in the environment and have potential health risks, including developmental issues and cancer. PFAS are now found globally, even in remote regions, and most people have some exposure.

Regulatory Landscape:

• PFAS are not currently classified as hazardous waste under EPA rules, though two compounds (PFOS and PFOA) were added as hazardous substances under CERCLA in 2024.
• EPA introduced drinking water standards for five PFAS chemicals in 2024.
• Risk-based screening levels exist for soil and aggregates, but they are guidelines, not enforceable standards.

PFAS in Recycling and Aggregates

PFAS contamination primarily arises from firefighting foam (AFFF) used at airports and military bases. Pavements exposed to AFFF may contain PFAS, raising questions about recycling these materials. Current research focuses on:

• Measuring PFAS in typical recycled concrete and asphalt (expected to be very low or non-detectable).
• Developing baseline data for industry to prepare for potential regulations.
• Testing leachability and risk assessment using EPA Method 1633.

Dr. Townsend proposed a collaborative sampling initiative with CDRA members to collect representative materials nationwide for analysis. Results would remain confidential to individual facilities but help establish industry-wide benchmarks.

Key Discussion Points

• LEED Reporting: PFAS is unlikely to be included in LEED tracking soon due to measurement challenges.
• Employee Safety: Standard respirators for silica dust likely mitigate PFAS exposure during crushing.
• Treatment and Disposal: Options include activated carbon for groundwater and high-temperature thermal oxidation for solids, though infrastructure is limited.
• Future Outlook: Emerging technologies aim to break PFAS bonds and mineralize compounds. Long-term focus will include treatment strategies based on contamination levels and preventing environmental release during recycling.
• Additional Concerns: PFAS in biosolids, kiln destruction feasibility, and potential impacts of high pH in recycled concrete were discussed.

Next Steps and Events

Lauren closed by sharing upcoming CDRA events:

• Quarterly Member Roundtable: January 21, 2026.
• Next Committee Meeting: February 17, 2026 (new time: 2 PM ET).
• CDRA Annual Convention: January 27–29, 2026, Tampa, FL.
• Shingle Recycling Forum: October 14-15 2026, Raleigh, NC.

The meeting concluded with appreciation for the presenters and holiday greetings.