The premier brownfield redevelopment conference in Virginia is hosted by the Virginia Department of Environmental Quality (DEQ) and the City of Staunton.
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This session presents the design and optimization of a remedial approach for a chlorinated solvent-impacted site in Northern Virginia with elevated concentrations and suspected DNAPL in a fractured bedrock aquifer where traditional approaches were limited by restricted access to contaminant mass and complex subsurface conditions. A combined in situ chemical reduction (ISCR) and anaerobic bioremediation strategy was implemented using controlled jet injection to deliver zero-valent iron and organic amendments. The method addressed mass transfer limitations by creating higher conductivity fracture networks and improving amendment distribution within targeted intervals. Key technical considerations included the use of both surface and borehole geophysics to help develop the conceptual site model and to guide injection zones, combining ISCR and anaerobic bioremediation, and management of post-injection conditions. Results from more than 24 months of monitoring will be discussed to evaluate performance and long-term effectiveness.
