SOIL EXPOSURE AND AIR PATHWAY CONCLUSIONS. Analytical results indicate elevated concentrations of SVOCs and metals are present in the landfill fill material and native material beneath the landfill. This threat has already been minimized by the capping of the landfill with clean soil and vegetation. The compounds with elevated concentrations are not volatile or mobile limiting the transportation of the compounds through the subsurface.
SOIL EXPOSURE AND AIR PATHWAY CONCLUSIONS. Analytical results indicate that no VOCs were found in soils and thus the source was not located during the investigation. However, because of TCE’s tendency to migrate downward from soil to groundwater, it is not considered likely that direct contact with soil, even in the source area, might cause significant exposures. TCE concentrations in groundwater exceeded DEQ’s RBC for vapor intrusion into residential and occupational settings, and volatilization to outdoor air for residential settings; this could be a significant source of exposures to residents, commercial workers, or excavation workers. DEQ recommends a site investigation (SI) to identify the source of contamination, to determine groundwater flow patterns beneath the Site, and to monitor air to determine if residents and workers are being exposed to unsafe levels of TCE in buildings and outdoor air.
