Human Health Risk Assessment and Remedial Investigation Support, Scovill Industrial LandfillEnvironmental Protection Agency, Region I, under contract to Nobis Engineering, Inc.
- Human health risk assessments of metals, semi-volatile organic compounds, and PCBs in soil, sediment, and surface water and volatile organic compounds in groundwater in support of a Remedial Investigation
- Multiple exposure areas and scenarios
- Data validation services
- Development of preliminary remediation goals and support for the Feasibility Study, Proposed Plan, public meetings, and Record of Decision
Avatar has performed human health risk assessments (HHRAs) for soil, sediment, surface water, and groundwater contaminated as the result of historical landfill activities at the Scovill Industrial Landfill Superfund Site, as a subcontractor to Nobis Engineering in support of a Remedial Investigation (RI). The assessments were performed in accordance with EPA risk assessment guidance under the direction and coordination with EPA Region I. Following completion of the RI, Avatar has provided support for the Feasibility Study, Proposed Plan, public meetings, and the Record of Decision.
The Site was used by the former Scovill Manufacturing Company as a landfill for disposal of ash, cinder, demolition debris, and other wastes generated by the nearby Company facility, which manufactured brass products, appliances, small motors, watches, injection molded plastics, photographic equipment, and numerous products for the military. The Site consists of an undeveloped and partially capped area with wetlands, as well as a developed portion. The developed portion consists of two- and three-story residential structures (apartment buildings) and small commercial buildings that include a child daycare facility, elderly housing, a cab service, car repair shop, and a shopping mall. The Site is located in a highly developed urban area, where many of the surrounding homes and commercial buildings have been built on urban fill. The purpose of these evaluations was to determine if the site-related compounds present in the soil, sediment, surface water, and groundwater would result in an unacceptable risk to humans considering both the current and hypothetical future land uses. To execute the work, Avatar incorporated both current and future land-use scenarios in the HHRAs and divided site soil data into 10 different exposure areas based on current land-use and potential exposures. Avatar evaluated several soil exposure pathways, including ingestion, dermal contact, and inhalation of fugitive dust and volatile soil contaminants. Scenarios included residents, industrial/commercial workers, day care children, groundskeepers, recreational visitors, construction/utility workers, and trespassers. Avatar also conducted an investigation of the potential for vapor intrusion of volatile compounds into current or future buildings to address potential indoor air concerns, which could result from volatilization of groundwater contaminants into indoor air spaces.
In addition to the HHRA, Avatar supported Nobis Engineering in the development of the Remedial Investigation and Feasibility Study (including development of preliminary remediation goals), provided data validation services, and supported EPA in discussions with the State in the development of the Proposed Plan and Record of Decision, and in the public meeting.