This case study reviews an ongoing Pennsylvania Hazardous Site Cleanup Act (HSCA) project where aqueous film-forming foam (AFFF) extinguished a large fire in the 1980s was the target of an innovative pilot study to address per- and polyfluoroalkyl substances (PFAS).

Working closely on behalf of the PADEP, Tetra Tech, a leading provider of consulting, engineering, and technical services worldwide, was principally involved in assessing the options and choosing a technology for the pilot test. This effort led to the decision to conduct a pilot study using PlumeStop®, a patented colloidal activated carbon amendment known to eliminate the risk of PFAS.

PFAS remediation

Case study highlights:

  • Total PFOS and PFOA reduced from 91,400 to <50 ng/L in one month
  • Injection testing effectively used for design confirmation in PlumeStop PFAS remediation pilot study
  • Application included innovative injection using straddle packer system to isolate vertical zones