Remedial Investigation/Feasibility Study for PFAS Impacted Areas - Army Installations in the Northeast Region

The SERES-Arcadis Joint Venture is conducting Remedial Investigations (RIs) and Feasibility Studies for per- and polyfluoroalkyl substances (PFAS) impacted sites at 12 Army installations across the northeast U.S. region. The goal of the RIs is to delineate the nature and extent of PFAS impacts in soil, groundwater, surface water, and sediment media and to collect sufficient data to complete human health and screening level ecological risk assessments.  The RI approach is adaptive and includes four mobilizations at the installations:

• Expanded Site Inspection (SI) sampling utilizing existing monitoring wells and surface water/sediment sampling to refine sampling locations for the prescriptive RI phase;

• Prescriptive Phase sampling to investigate soil source areas and downgradient groundwater transects;

• Adaptive Phase sampling to establish step-outs and refine the conceptual site models (CSMs);

• Final Delineation and Monitoring Phase for establishment of the permanent monitoring well network and locations for surface water monitoring.

At this time, the framework and planning for the overall project has been developed and the team has completed Expanded SI and prescriptive phase field events following finalization of planning documents. The team acts swiftly to adjust to the evolving regulatory environment for PFAS, including evaluation for investigating additional areas at each installation and accommodating additional step-out locations for delineation of impacts to current screening levels adopted by the Department of Defense. The RIs are in progress, and open discussions with the Army are ongoing to complete the investigations necessary to be protective of human health and the environment.