Guilfoil, D. | New England Interstate Water Pollution Control Commission National Tanks Conference, 10-13 September, Lousiville, KY, 2018

A 1980s release of gasoline at a large throughput fueling facility at an Interstate Rest Area produced an LNAPL groundwater plume that impacted a downgradient wetland area. Previous remediation efforts at the facility sufficiently addressed petroleum impact to the vadose zone, but the groundwater plume persisted. Dissolved volatile PHCs were detected in monitoring wells located at a wetland area 200 ft from underground storage tank systems. The natural reducing conditions at the wetland were exacerbated by the PHC groundwater plume resulted in the concentration of arsenic and beryllium in shallow soils. Remediation of the groundwater plume was complicated due to the active fueling operation and presence of ~25 ft of fill material overlying the saturated zone. A permeable reactive barrier (PRB) was installed orthogonal to groundwater flow ~100 feet up-gradient of the affected wetland to bioremediate the plume. A mixture of BOS 200®, calcium sulfate, and water was injected throughout the saturated zone to establish the PRB. Post-installation monitoring data indicate that the remedy is performing as designed. The conceptual site model, PRB design and installation data, and ~18 months of post-PRB installation performance monitoring were presented. http://neiwpcc.org/wp-content/uploads/2018/10/Guilfoil.pdf