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Remedial Investigation/Feasibility Study

After a site is listed on the NPL, a remedial investigation/feasibility study (RI/FS) is performed at the site. The remedial investigation serves as the mechanism for collecting data to:

  • characterize site conditions;
  • determine the nature of the waste;
  • assess risk to human health and the environment; and
  • conduct treatability testing to evaluate the potential performance and cost of the treatment technologies that are being considered.

The FS is the mechanism for the development, screening, and detailed evaluation of alternative remedial actions.

The RI and FS are conducted concurrently - data collected in the RI influence the development of remedial alternatives in the FS, which in turn affect the data needs and scope of treatability studies and additional field investigations. This phased approach encourages the continual scoping of the site characterization effort, which minimizes the collection of unnecessary data and maximizes data quality. A wide variety of technologies are used throughout the remedial investigation and feasibility process.

The RI/FS process includes these phases:

For more information, please consult the RI/FS and Treatability Studies Overview.


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