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Beginning in 1996, IDEM has published several risk-based closure guidance documents. Descriptions and links to those documents appear below.
House Enrolled Act (HEA) 1162 significantly changed allowable approaches to closure of contaminated sites. IDEM published three major documents in response to HEA 1162. The Remediation Closure Guide (RCG) describes selected approaches to investigation and risk-based closure of contaminated or potentially contaminated sites. The Remediation Program Guide (RPG) provides guidance related to specific regulatory programs. The Interim Implementation Document served as a bridge between the enactment of HEA 1162 and issuance of the RCG and the RPG.
IDEM published the Draft Vapor Intrusion Pilot Program (DVIPP) in 2006, and issued a supplement to the DVIPP in 2010. IDEM’s most current vapor intrusion guidance now appears in the RCG. However, some responsible parties remain eligible to pursue closure under the 2006 or 2010 guidance documents.
IDEM expanded its use of risk-based closure in 2001 when it published two Risk Integrated System of Closure (RISC) documents. The RISC Technical Resource Guidance Document (Tech Guide) describes approaches to investigation and closure of contaminated sites. The RISC User’s Guide provides program-specific guidance for the same purposes. Updated guidance is available in the RCG, above. However, responsible parties who met certain program-specific milestones before September 22, 2012 are eligible to continue using the 2001 guidance documents.
IDEM published its first risk-based closure guidance in 1996, for the Voluntary Remediation Program. Though it is now largely superseded by more recent guidance, there are still some responsible parties that use the VRP guidance document.
IDEM periodically issues announcements, updates, and errata for its guidance documents.