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PFAS Characterization and Remediation

PFAS Characterization and Remediation

Farallon is leading an investigation to evaluation PFAS substances in Washington State.

Farallon’s technical depth and strong working relationships at the State and Local level support successful characterization program.

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Farallon has been leading an investigation to evaluate releases of per- and polyfluoroalkyl substances (PFAS) in the Lower Issaquah Valley in Washington State. Following initial detections of perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in drinking water by the U.S. Environmental Protection Agency Unregulated Contaminant Monitoring Rule sampling program, Farallon has worked with both state and local agencies to evaluate historical uses of PFAS in the Lower Issaquah Valley and the potential migration pathways from shallow points of release to deeper groundwater-bearing zones that are used for a drinking water resource. Research indicated that historical training exercises with aqueous film forming foam (Class B firefighting foam) was one of the primary potential release mechanisms within the Lower Issaquah Valley. This information was used in coordination with stakeholders to develop a comprehensive field investigation program for PFAS releases to shallow soil, shallow groundwater, and deeper groundwater-bearing zones.

“This PFAS field investigation has required additional planning and coordination to ensure that stakeholder goals were achieved, and that data collection met strict quality control and quality assurance objectives while sampling for target compounds in soil and groundwater with concentrations in the parts-per-billion to parts-per-trillion concentration range” says Principal Hydrogeologist Eric Buer.

Farallon worked with analytical laboratories to refine a process to evaluate the direct contact with PFAS-impacted soil exposure pathway using multi-incremental sampling methodology. Farallon also performed discrete sampling for soil, reconnaissance groundwater, and groundwater. As of 2019, scoping for additional characterization of PFAS transport pathways and seasonal trends in subsurface conditions is underway. Identification of remedial alternatives with existing data is in progress, with a goal of completing an evaluation of feasible cleanup alternatives that will meet stakeholder remedial action objectives before the end of 2021.


Services Utilized

Contaminated Site Investigation and Cleanup

Over the past 20 years we have developed a top-tier team of technical professionals including experts in contaminant fate and transport characterization, modeling, and remediation engineering who have successfully developed and...

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Emerging Contaminants

We are among the leading firms in Washington State working with several parties to evaluate and ultimately remediate PFAS releases at multiple locations.

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Meet Our Experts

headshot of Clifford Schmitt Clifford T. Schmitt Principal Hydrogeologist

Cliff is a licensed geologist and hydrogeologist in Washington and California. He has 35 years of experience in investigation and cleanup project management

smiling-farallon-employee-with-short-dark-hair-with-a-beard Eric Buer Principal Hydrogeologist, Regional Operations Manager

Eric is a Licensed Geologist and Hydrogeologist with more than 15 years of experience in environmental site assessment, remediation, and restoration. His project work includes scoping and managing large site...

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