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PFAS Webinar Series

PFAS Webinar Series

About these webinars:

TestAmerica is offering a series of four webinars on ideas we believe are worth discussing about PFAS. The goal of this series is to review everything about PFAS from an introduction on the subject to finding out the myths and how to collect the correct data to understanding the TOP Assay.

Topics of discussion will include: Introduction to PFAS; Dispelling the Myths and Producing Defensible Data; Site Investigation Challenges and Best Practices; and Closing the PFAS Mass Balance (TOP Assay).

Sign up for each of our Four Part Webinar Series




Part 1- PFAS Basics: An Introduction to the Chemistry, Sources, Regulation and Analysis

Presented by Taryn McKnight, Product Manager, TestAmerica

Date: August 6, 2019

About This Webinar:

Per- and polyfluoroalkyl substances (PFAS) are a family of synthetic compounds containing thousands of chemicals formed from carbon (C) chains with fluorine (F) atoms attached. PFAS are used in a wide variety of industrial and commercial products. PFAS are persistent in the environment and are resistant to typical environmental degradation processes. As a result, they are widely distributed and are found in soil, sediments, groundwater, air and tissue across the United States. According to the US EPA, certain PFAS can bioaccumulate in the human body, and there is evidence that exposure to PFAS can lead to adverse health outcomes.

This presentation will briefly cover the basic introductory topics of nomenclature, chemistry, sources, exposure, regulations, analysis and future concerns related to PFAS presence in the environment.

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Part 2 - PFAS: Dispelling the Myths & Producing Defensible Data

Presented by Taryn McKnight, Product Manager, TestAmerica & David Kaminski, Senior Vice President, QED Environmental Systems          

Date: August 20, 2019

About This Webinar:

Many sites have been required to add the analysis of Per-and Polyfluoroalkyl Substances (PFAS) to their ground water sampling plans, including military bases, airports, landfills and manufacturing. Collecting samples for PFAS is very different from sampling for fuels, solvents, and other chemical contaminants, as potential sources of PFAS are nearly everywhere - in waterproof clothing and field gear, insect repellent, sunblock, and even field notebooks. Currently there are no EPA approved methods for PFAS analysis of matrices other than finished drinking water. For all other matrices, a 537 modified method, using isotope dilution, is commonly used and is widely accepted as the gold standard in quantitation for challenging contaminants such as these.

In this webinar, David Kaminski with QED Environmental Systems will explore the sources of PFAS sample contamination and dispel some of the myths and speculation surrounding the issue. Taryn McKnight with TestAmerica Laboratories will illuminate the multitude of parameters and best practices to confirm with your laboratory when 537 modified is being applied.

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Part 3 - PFAS: Advanced Discussion of Site Investigation Challenges and Best Practices

Presented by Karla Buechler, Technical Director    

Date: September 10, 2019

About This Webinar:

With a thorough understanding of the fundamentals of per- and polyfluoroalkyl substances (PFAS), where they come from, and why we are concerned with them, we can dive into the next level. We have a number of rapidly evolving parameters to stay abreast of and incorporate into our assessments.

Our webinar will address several questions, including: How do the unique characteristics of PFAS cause them to behave in the environment? What implications does this have on the development of our conceptual site models, analytical approaches, and treatment technologies? What is the current regulatory climate, and how does this impact our choices and decisions?

We will look at USEPA’s progress on addressing these contaminants, and where the gaps in regulatory guidance impact our approach to site investigations. We will also explore how issues such as PFAS in complex matrices, the presence of precursors and the challenge of acquiring representative data will impact site remediation and future decisions around site closure.  

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Part 4 - Closing the PFAS Mass Balance: The Total Oxidizable Precursor (TOP) Assay

 Presented by Karla Buechler, Technical Director 

Date: May 7, 2019 & September 24, 2019

About This Webinar:

Current analytical methodologies measure a discrete list of ~20 (PFAS) compounds. Many additional PFAS are not determined as discrete compounds by existing analytical methods, including Method 537. Hence, we may be underestimating the PFAS risk potential present in the environment. There is significant pressure from the public, environmental agencies, and others to apply methodologies that more closely measure the full extent of PFAS contamination.

TestAmerica Sacramento implemented the TOP assay as a solution to this problem. The TOP assay rapidly converts PFAA (perfluoroalkyl acids) precursors into PFAAs including PFOA, replicating what micro-organisms in the environment would achieve after many years. This quantifies the sum of PFAS that could be converted to PFAAs in the environment. TOP assays have revealed that for AFFF-impacted sites, existing analytical methods only detect an estimated 30% to 50% of the total PFAA mass present as PFAA precursors.

In this presentation, we will discuss PFAS generation, formation and environmental release to sampling and analysis. We will also discuss the current regulatory status of these chemicals.

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PFAS Forecast: A look at what is to come in 2020

Presented by Karla Buechler

Date: To Be Determined Late Winter 2019.

About This Webinar:

Per- and polyfluoroalkyl substances (PFAS) are in the news across the states, and they have become a growing topic of discussion amongst environmental practitioners, at all levels of regulatory agencies, and they are certainly a hot topic at conferences. If you have tuned in at all during 2018, you likely heard a lot of speculation as to where we are headed in 2019. There has been a lot of activity, shifting priorities, and responses to new information that makes some of these targets difficult to keep track of.

In the spirit of the season, we have cataloged what we know is in progress, and what the prospects for 2019 look like as we kick off the New Year.

The Presenters:


Taryn McKnight

PFAS, Air, Vapor Intrusion

Product Manager, TestAmerica

David Kaminski


Senior Vice President of QED Environmental Systems

Karla Buechler

PFAS, Explosives and LCMS Support

Corporate Technical Director, TestAmerica

To view a recorded version of this webinar, please contact