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Integration of RBCA Frameworks and Remediation Technologies

Decisions that determine the proper risk-based remediation approach are based on technical, regulatory, cost, legal, and political factors. A wide variety of options such as the ASTM RBCA tiered approach, the AP/ Decision Support Software, and a host of agency-specific methods and commercial risk assessment software are all available. The optimization of a remediation project requires the right remediation technology coupled with the appropriate analytical framework. For groundwater remediation, the application of various “risk reduction” technologies can be classified as aggressive (pump and treat), moderate intensity ( air sparging), low intensity ( oxygen release compound-ORC), and intrinsic ( monitor only). The time frame of risk analysis will establish the proper risk reduction strategy. The selection process is inherently iterative, and the approach by which an optimal solution can be derived forms the basis of this article. A case study of a Texas site put these issues into context.