ITRC: Overview of the Tire-Derived Chemicals 6PPD & 6PPD-quinone Training

In October 2024, ITRC released the 6PPD & 6PPD-quinone Guidance Document to provide environmental professionals and communities with information about the current science and regulatory framework of 6PPD and 6PPD-quinone (6PPD-q). 6PPD-q is a contaminant of emerging concern and is a transformation product of the tire anti-degradant (6PPD), an antiozonant used in tires.

Join us for this ITRC training course to get a basic overview of the science and policy measures surrounding the Tire Anti-Degradants 6PPD and 6PPD-q. Attendees will gain insight into the current state of knowledge on topics such as: background and use of 6PPD in tires, toxicity in aquatic species and humans; occurrence, fate, and transport; measuring, mapping, and sampling; mitigation measures; and policy, regulations, and laws.

Currently, 6PPD is used in all tires and can contaminate stormwater and surface water anywhere tires are used. 6PPD-q was identified as a chemical fatal to coho salmon in 2020. Since that time, it has been documented as acutely toxic to multiple trout species found throughout the United States. 6PPD and 6PPD-q have been found in waterways, aquatic organisms, soils, air, and humans.

This training will introduce you to the ITRC 6PPD & 6PPD-quinone Guidance Document which provides more technical detail than can be covered in this training course

Allan Chartrand (allanc50@comcast.net)
Allan Chartrand is a career environmental scientist and toxicologist in Seattle, WA. His key areas of technical expertise relate to toxicology (especially ecotoxicology) and risk assessment, focusing on ecological and human health risk assessment, water quality and Clean Water Act (CWA) issues, and contaminated sediments. He is a former water quality scientist for Los Angeles Regional Water Quality Control Board in California, with expertise in NPDES water quality permitting, CWA compliance, and TMDLs. He completed his undergraduate work in biology at UC Berkeley, and graduate work in toxicology at UCLA. He was also Board-certified as a Diplomate by the American Board of Toxicology (DABT). He currently serves on the Board of Directors for Puget Soundkeepers Alliance as well as their Policy & Technical Committee.

Rachael Lane, U.S. Geological Survey (rflane@usgs.gov)
Dr. Rachael Lane is an analytical chemist with the U.S. Geological Survey (USGS). She serves as the research lead and principal investigator for one of the core laboratories of the Environmental Health Program in the USGS Ecosystem Mission Area. Rachael received a Ph.D. in Chemistry with honors from the University of Kansas and has dedicated her 20-year career to developing analytical methods to understand the occurrence, fate, and transport of emerging contaminants. Through nationwide research collaborations, her research has focused on understanding the effects of endocrine disrupting compounds, pharmaceuticals, antibiotics, pesticides, disinfection byproducts, and tire-related chemicals 6PPD and 6PPD-quinone on environmental and human health. Rachael has participated in the Interstate Technology and Regulatory Council (ITRC) Tire Anti-Degradants (6PPD) Team serving as the Co-Lead for the Environmental Assessment Strategies writing team subgroup and the Outreach Team subgroup.

Ezra Miller, San Francisco Estuary Institute (ezram@sfei.org)
Dr. Ezra Miller is a Senior Scientist in the Clean Water Program at the San Francisco Estuary Institute, a nonprofit organization dedicated to providing scientific support to California agencies and organizations working on water quality protection, policy development, and environmental assessment. Ze leads the risk screening focus within the team of SFEI scientists investigating contaminants of emerging concern and microplastics in the San Francisco Bay and other regions of California. Ezra studies the environmental fate and effects of a broad range of contaminants, including per- and polyfluoroalkyl substances (PFAS), flame retardants, current-use pesticides, microplastics, and rubber and plastic additives including tire-derived contaminants like 6PPD, among others. Ze is particularly interested in using novel methods for contaminant identification, characterization, and monitoring prioritization to support management efforts and minimize impacts to aquatic ecosystems and human health. Ezra received a B.S. in Environmental Science and Chemistry from Warren Wilson College and a Ph.D. in Environmental Toxicology from the University of Wisconsin - Madison.

Mark Schroeder, Integral (mschroeder@integral-corp.com)
Mark Schroeder is an engineer experienced in environmental remediation and the fate and transport of contaminants in groundwater, soil, and sediment. He has a B.S. degree in Environmental Engineering from Oregon State University and a M.S. degree in Environmental Engineering from the University of Colorado Boulder. He is a registered professional engineer in the State of Washington.

Rhea Smith, WA Ecology (rhsm461@ecy.wa.gov)
Rhea Smith is the 6PPD monitoring lead within the Environmental Assessment Program’s Toxics Studies Unit. Rhea coordinated a technical advisory review and corresponding publication of a 6PPD legislative report outlining assessment and mitigation strategies. She supported the writing of the ITRC tire anti-degradant guidance document. Rhea has a background in developing and leading aquatic monitoring activities to understand human disturbance impacts on ecosystem processes and inform conservation and restoration actions.

Katrina E. Varner, U.S. Environmental Protection Agency (Varner.Katrina@epa.gov)
Katrina Varner is a primary research scientist at the National Exposure Research Laboratory in Las Vegas and has been conducting research for EPA since 1990. Her research centers on how to characterize pollutants and contaminants, and how they impact the health of humans and animals. Her primary research focus has evolved into method development and evaluation of monitoring parameters of contaminants and hazardous waste. Method and monitoring development involve the detection, speciation, and identification of organometallics, carbon-based nanomaterials and micro/nanoplastics in various media.

Moderator:

ITRC Training Program (itrc@itrcweb.org)

• Slide Presentation for ITRC 6PPD-Q (3.14MB/PDF)

Webinar Slides and References:

• Slide Presentation for ITRC 6PPD-Q (3.14MB/PDF)

Additional Resources:

• These materials will be available by Thursday, May 1, 2025

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