Low metals, VOCs, and SVOCs concentrations were detected in the soil and groundwater. The constituents detected were considered to be at concentrations that would not adversely impact human health or the environment. Coal tar was also observed in select borings.
The coal tar impacted material exposed on the beach and the embankment was manually recovered and excavated. The recovered material was transported offsite to a licensed disposal facility. Coal tar, however continued to migrate onto the beach and through the embankment.
Based on the results of the subsurface investigation, CEG performed a limited feasibility study. Several alternatives were considered to minimize the migration of tar-like material to the beach. The alternatives ranged from no further action to soil excavation. The selected method of installing a barrier wall and erosion control system was determined to be the most effective approach. The purpose of this system is to minimize the potential for direct human contact to tar-like substances and abate the flow of the material to the beach and inter-tidal sediments.