To facilitate management of similar problems, the Tri-Party Agreement groups these sites and units into operable units based primarily on geographic proximity and common waste sources. There are seventeen operable units in the 100 Area for contaminated sources such as soils, structures, debris, and burial grounds. See Table 5 for a timeline of events relating to this case. Table 6 provides a list of all the operable units associated with the three areas of interest for this case, and their primary focus.
Additional information regarding each area is provided below.
It encompasses approximately 1.8 square miles and is located immediately adjacent to the Columbia River shoreline. In general, it contains waste units associated with the original plant facilities constructed to support B Reactor operation, as well as the cooling water retention basin systems for both B and C reactors. It encompasses approximately 1.5 square miles and is immediately adjacent to the Columbia River. The operable unit contains waste units associated with the original plant facilities constructed to support the D and DR Reactors. The 100-H Area contains the H nuclear production reactor, which operated from 1949 to 1965.