A risk-based approach for initial prioritization of operable units for remediation

Prioritization of operable units (OUs) for remediation under a remedial investigation/feasibility study (RI/FS) is an important consideration to provide the best protection of human health and the environment. Because of budgetary and operational constraints, not all OUs can be remediated concurrently; therefore, a risk-based approach to prioritization of OUs has been developed to identify the most significant OUs, in terms of potential risk, for remediation activities. The prioritization system incorporates a qualitative and a quantitative assessment to establish an initial ranked order of OUs; those with the greatest need for near-term remediation are ranked highest. However, priority is determined without consideration of circumstances that can affect remediation activities such as funding constraints, ongoing facility operations, or demolition and construction plans. Such issues are ultimately incorporated within the prioritization process to modify the initial priority, if necessary