ultimately led to groundwater and soil contamination include uranium mining, milling, and refining; isotope separation; fuel and target fabrication; weapons component fabrication; weapons testing; and most important, chemical separations, in which spent nuclear fuel rods and targets were dissolved to extract uranium and plutonium . Understanding the locations, types, and risks of contaminants present in the DOE weapons complex is the first step in determining remediation technology development needs. Whether a given process will be effective in cleaning up subsurface contamination at a specific site depends on the hydrogeology of the site, the characteristics of the contaminants, and the acceptable risk levels for the site. As described below, DOE’s information on these dimensions of its subsurface contamination problems is incomplete. In addition to these tasks, which primarily involve a technical evaluation of remediation technologies and the performance standards they must
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