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Risk Evaluation Guidance

IDEM periodically issues technical information and announcements to supplement the Remediation Closure Guide. This page lists these resources chronologically, with newer information and announcements appearing first.

Current Guidance

  • Attenuation Factors:
    • On October 20, 2015, IDEM issued a memorandum [PDF] to announce its acceptance of the attenuation factors described in the U.S. Environmental Protection Agency’s vapor intrusion guidance from June 2015.

Superseded Guidance

The technical information that appears below has been superseded by newer guidance. However, some responsible parties may be eligible to use superseded guidance when addressing releases.