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Information on this site is retained to archive the decision
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During initial environmental studies, the Brookhaven National Laboratory (BNL) site was subdivided geographically into seven
Operable Units (OU). The main Operable Unit dealing with groundwater contamination is OU III. OU I, IV, V, and VI also address
The BNL Groundwater
Status Report is an annual comprehensive summary of data
collected from environmental restoration and surveillance projects.
Operable Unit I includes groundwater contamination in the southeastern area of the Laboratory that is being addressed by a
Operable Unit III was developed to address groundwater "plumes," or areas of contamination, emanating from the central and
southern portion of the BNL site. An Explanation
of Significant Differences to the OU III Record of Decision has
The main contaminants of concern are volatile organic compounds (VOCs), strontium-90, and
tritium. VOCs have been found both on and off Laboratory property, while strontium-90 and tritium contaminants are confined to
the Laboratory site.
Operable Unit IV included groundwater contamination at BNL's Central Steam Facility.
The five-year review of the
Operable Unit IV treatment system is now available.
Operable Unit V includes groundwater in the eastern-central area of the Laboratory.
Operable Unit VI includes groundwater in an area about 1,000 feet west of Weeks Avenue at depths of 90 - 130 feet below ground.
Groundwater in this area contains the chemical EDB (ethylene dibromide), once commonly used as a pesticide and gasoline
Last Modified: February 1, 2008
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