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IDEM Updates Remediation Screening Levels


By Andy Bowman, Partner, Bingham Greenebaum Doll LLP

IDEM has published its annual update of the risk-based screening levels that can be used as remediation objectives in IDEM’s Voluntary Remediation Program and other regulatory programs. The updated screening levels are effective as of March 5, 2014, which also marks the commencement of a six-month transition period during which a party can elect to use the prior screening levels or the new screening levels by meeting certain milestones before the end of the transition period.

Over 100 changes appear in the 2014 update. Perhaps the most significant change is the inclusion of revised soil direct contact and excavation screening levels for arsenic. The arsenic screening levels have increased as the result of EPA adjusting the default relative bioavailability of arsenic from 100 percent to 60 percent. These revised arsenic screening levels were announced by IDEM last July and their use was optional pending inclusion in the 2014 update. Screening levels for eight new chemicals also were added: tert-amyl alcohol, butylated hydroxytoluene, sec-butylbenzene, tert-butylbenzene, dibenzothio-phene, dinitrotoluene, thiocyanide acid and tricresyl phosphate.

To view a complete PDF of the Environmental Letter March 2014 Issue, click HERE.


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