REMEDIAL STRATEGIES FOR A STRUCTURALLY COMPLEXED INDUSTRIAL FACILITY

An air sparging and soil vapor extraction remediation system was pilot tested, designed for full scale, and implemented at a former industrial facility. The system was subsequently retrofitted with a groundwater depression system when it was discovered that unconfined/semi-confined groundwater rose several feet due to decommissioned stormwater management systems and periods of historic rainfall. To further complicate matters, the area of concern is a multi-tiered parking lot and building foundation which created various hydraulic gradients and influenced contaminant migration. The challenge was to remove as much chemical mass from the middle Pleistocene aged Coastal Plain formations in the most cost effective manner. Through detailed evaluation of remediation data and various tests performed on the subsurface, the system has been optimized to recover nearly 20 pounds of contaminant mass from the subsurface per day.