No Further Action for Large PCE Plume Under Main Street, USA

Case study highlights:

• Closure achieved for a large chlorinated solvent plume in an urban area
• PCE sources rapidly eliminated and plume efficiently treated using a suite of REGENESIS in situ remediation technologies
• Despite access limitations, large PCE plume eliminated, resulting in NFA

This case study reviews a former dry cleaner site in a small town in western Indiana, where site regulatory closure was achieved after a large dissolved-phase PCE groundwater plume was successfully treated using PlumeStop, enhanced reductive dechlorination (ERD) amendments and S-MicroZVI from REGENESIS. Patriot Engineering, a leading Midwest environmental consulting firm, headquartered in Indianapolis, specified ERD as the most practical and economically viable method to effectively treat the large plume. Patriot’s strategy to achieve closure was to significantly reduce the PCE plume and then to demonstrate plume stability through post-remediation monitoring. By combining remediation technologies from REGENESIS with a highly efficient and cost-effective remediation design, Patriot’s treatment approach eliminated the PCE plume. Subsequent performance monitoring and analysis completed by Patriot demonstrated plume stability, earning the site a No Further Action status from Indiana Department of Environmental Management (IDEM).