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During initial environmental studies, the Brookhaven National Laboratory (BNL) site was subdivided geographically into seven
Operable Units (OU). Shortly thereafter, two of them were combined to form OU II/VII. The main Operable Units dealing with soil
contamination are OU I and OU II/VII. Operable Unit IV also addresses some soil contamination.
Operable Unit I was originally defined as a 950-acre area in the southeastern part of the BNL site. Later, to facilitate the cleanup
process, similar types of contamination from different Operable Units were grouped together. Soils contaminated with radioactive
materials from areas originally included in OU II/VII, IV and VI are being cleaned up under OU I because they have similar
Operable Unit II/VII is located in the central, developed portion of the BNL site. It consists of four "areas of concern" - the Waste
Concentration Facility, aerial radiation survey locations, the former Low Mass Criticality Facility, and storage yards for the
Alternating Gradient Synchrotron.
Operable Unit IV is also located in the central, developed portion of the BNL site. Its area of concern is the Central Steam Facility.
OU IV also addressed the Reclamation Facility and Sump Outfall Area, which has since been transferred to OU I.
The five-year review of the Operable Unit IV treatment system is now available.
Last Modified: February 1, 2008
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