Characteristics of aqueous film forming foam (AFFF) sites impacted with per- and polyfluoroalkyl substances (PFAS): A 37-site study

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

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Dates and Location

Dates

June 14th and 15th, 2022

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Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

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Published: 2025

Authors:  Poonam Kulkarni, Nicolette E. Andrzejczyk, Arun Gavaskar, Abigail Cartwright, David T. Adamson, John Cook, Charles J. Newell

Abstract

A meta-analysis of 37 military aqueous film-forming foam (AFFF) sites was conducted to gain insights into the fate and transport of seven key perfluoroalkyl acids (PFAAs): PFOS, PFOA, PFHxS, PFHxA, PFBS, PFBA, and PFNA. Specifically, this study aims to examine occurrence of the seven PFAAs in soil and groundwater at AFFF source zones and understand PFAA plume characteristics as well as estimate plume lengths. Based on an evaluation of these PFAAs in soil samples collected in the source zone, the highest concentrations predominantly occur within the top one meter (m) below ground surface (bgs). PFOS and PFOA are the major PFAA contributors in soil at source zones, whereas groundwater exhibits a more diverse concentration distribution. Inferred Current Plume Lengths are presented for the seven PFAAs, with median plume lengths ranging from 220 to 800 m. Finally, an exceedance magnitude assessment was conducted to evaluate the potential contribution of each studied PFAA to the exceedance of groundwater regional screening levels (RSLs) or maximum contaminant levels (MCLs). Results indicate that at typical AFFF sites, PFOS, PFOA, and PFHxS generally contribute 99 % of the estimated exceedance magnitude, whereas short-chained PFAAs (PFHxA, PFBS, and PFBA) contribute <1 %.