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Modeling PlumeStop Longevity at AFFF-Impacted Military and Airport Sites

In this webinar we were pleased to have as a special guest speaker, globally-recognized PFAS modeling expert and recent lead author of the REMEDIATION Journal article titled Longevity of colloidal activated carbon for in situ PFAS remediation at AFFF-contaminated airport sites, Grant Carey, PhD, President of Porewater Solutions. His presentation discussed modeling PlumeStop® longevity at AFFF-impacted military and airport sites. He was joined by Scott Wilson, President & CEO of REGENESIS, who provided an update on the use of colloidal activated carbon as a sustainable, low-cost method to eliminate PFAS risk and liability.

Highlights of this free webinar:

  • Case studies of 17 PFAS field sites showing successful PlumeStop performance results for up to six years and counting
  • In-Situ Remediation Model (ISR-MT3DMS) indicates PlumeStop longevity that may occur at a wide range of AFFF-impacted military and airport sites
  • Remedial alternatives that may be used in combination with PlumeStop at AFFF-impacted sites will be discussed

There is growing interest in the use of PlumeStop to sequester PFAS in groundwater sorption zones. PlumeStop contains colloidal activated carbon (CAC) particles which are sufficiently small to allow for easy injection into porous media. The performance of PlumeStop at 17 PFAS field sites is summarized, including upgradient concentrations of PFAS, organic co-contaminants, and native organic matter; and the fraction of CAC in soil after injection. These case studies demonstrate that PlumeStop has been used successfully at PFAS field sites with total monitoring periods to-date ranging from 0.3 to six years.

A review of state and federal guidance indicates that the four most frequent PFAS of interest are PFOS, PFOA, PFHxS, and PFNA. A sensitivity analysis using the In-Situ Remediation Model (ISR-MT3DMS) illustrates the magnitude of PlumeStop longevity that may occur at a wide range of AFFF-impacted military and airport sites. A statistical analysis of PFAS concentrations at 96 AFFF-impacted sites and laboratory batch tests supported this modeling study. Various influencing factors were modeled, including plume concentrations, groundwater velocity, the engineered fraction of CAC in soil, and sorption isotherm properties. Remedial alternatives that may be used in combination with PlumeStop at AFFF-impacted sites are discussed.

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Webinar recording available