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

  • Interim PAH and Trimethylbenzene Levels [PDF]:
    • In June 2017, the U.S. EPA revised certain toxicity parameters that are not currently reflected in the IDEM Screening Levels Table. This document shows the optional levels to use until they are updated in 2018.
  • Attenuation Factors:

Superseded Guidance

The technical information that appears below has been superseded by newer guidance. However, some responsible parties may be eligible to use superseded guidance when addressing releases.