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5.2.6 Periodic review

At regular intervals, for example, every five years, a review should be conducted to evaluate the implementation and performance of a remedy in order to determine if the remedy is or will be protective of human health and the environment. Key questions for the review may be:

  • Is the remedy functioning as intended by the decision documents?
  • Are the exposure assumptions, toxicity data, clean-up levels, and remedial action objectives used at the time of the remedy still valid?
  • Has any other information come to light that could question the protectiveness of the remedy?

Site-specific information to be reviewed may include results from monitoring activities, operation and maintenance reports or other documentation of remedy performance, and previous five-year review reports. Changes that affect the validity of clean-up levels (e.g., standards identified as applicable or relevant and appropriate requirements and assumptions about contaminant characteristics and potential exposure) should also be considered. Nearby communities and stakeholders should be notified when a five-year review is conducted or even be involved in its compilation. The results of the review should be archived for future referencing.