EPA Superfund Site

MACON NAVAL ORDNANCE PLANT

GA | EPA ID GAD003302676

About this site’s exposure pathways: As of August 2023, the Macon Naval Ordnance Plant site is considered Insufficient Data to Determine Human Exposure Control status because the Human Health Baseline Risk Assessment (HHBRA) has not yet been completed. Contaminants of Potential Concern include trichloroethylene (TCE) and other Volatile Organic Compounds (VOCs). EPA has negotiated with the Potentially Responsible Parties (PRPs) to perform the Remedial Investigation (RI) and Feasibility Study (FS), which will include a HHBRA. The RI/FS is expected to be completed in December 2023. In 2015 and 2016, EPA found unacceptable levels of TCE in indoor air at two buildings on the site. At that time, EPA worked closely with the business owners to implement engineering controls that successfully mitigated TCE concentrations in indoor air to safe levels for site workers. However, in January 2020, unacceptable levels of TCE were again found in the Unit 6 building. In Dec. 2021 that building had a sub-slab depressurization system installed to mitigate the risk and the sampling results confirm that the indoor air mitigation has been successful in returning the air quality to acceptable levels. Groundwater at the site is not used for drinking water and PCBs in site soils are below commercial risk but data is being reviewed to determine if all human exposure pathways have been evaluated. EPA has prepared a Community Involvement Plan, and on November 12, 2019, a joint public availability session was held that addressed both the Macon Naval Ordnance Plant and Armstrong World Industries sites. On January 27, 2023, the EPA also attended an availability session, hosted by the GADOH, to inform workers at the Unit 6 building of the vapor mitigation status at that building.