OU I South Boundary GW Treatment System Begins Operation

December 1996

The Operable Unit I plume consists of contaminated groundwater from two sources - the Current Landfill and the former Hazardous Waste Management Facility (HWMF). The primary contaminant in the plume is volatile organic compounds (VOCs) from solvents. The plume was found to extend off-site approximately 3,400 feet south of BNL's southern boundary. When it was first detected in 1995, the Department of Energy (DOE) and BNL began a residential well sampling program in the area in cooperation with Suffolk County. Although the results showed no contamination above drinking water standards from BNL, free connections to public water were offered by DOE to homeowners as a precautionary measure.

The on-site segment of the plume is being remediated by the OU I South Boundary Pump and Treat System. The system, the furthest east along BNL's southern boundary, consists of two wells screened deep in the Upper Glacial aquifer. The extracted groundwater is treated by air stripping and is recharged back to the ground at the RA V basin. This system began operation in December 1996.

The off-site segment of the plume is being addressed by the North Street East System which began operation in June 2004.

Groundwater monitoring has shown that the plume on-site has been hydraulically cut from the off-site segment and concentrations of VOCs are declining. The South Boundary treatment system is expected to operate through 2011 and reach MCLs (drinking water standards) through natural attenuation by 2021. Monitoring will continue until 2030.

To learn more see the latest copy of BNL's Annual Groundwater Status Report