PFAS Effectively Remediated at Former Naval Air Station Alameda

Case study highlights:

• Within one year of implementation, >99% PFAS reductions achieved within treatment zone
• Results indicate a near-complete halt of PFAS migration into the estuary
• Site establishes a precedent for easy-to-implement, low-cost, and zero-waste PFAS remediation at military sites

Historical firefighting activities at the former Naval Air Station (NAS) Alameda resulted in high PFAS (per- and polyfluoroalkyl substances) concentrations in the groundwater, threatening the Oakland Inner Harbor. In response, the project team, comprising Bayside Engineering, Construction, Inc. (Bayside), APTIM Federal Services (APTIM), and REGENESIS®, collaboratively implemented a 720-foot in situ permeable reactive barrier (PRB) using PlumeStop® colloidal activated carbon (CAC) technology. This innovative approach created an adsorptive barrier within the polluted aquifer, effectively capturing PFAS and preventing their migration. After one year, the target PFAS compounds were reduced by more than 99% in the treatment zone with significant decreases in the downgradient wells.