MI HB6025

Establishes four cleanup categories for hazardous substance remediation: Residential, Nonresidential, Limited Residential, and Limited Nonresidential, with the person proposing remedial action selecting the appropriate category subject to department approval.

Requires the department to develop cleanup criteria based on generic human health risk assessment assumptions for each category, using reasonable and relevant exposure pathways, with a cancer risk standard of 1 additional cancer per 100,000 individuals and a hazard quotient of 1.0 for noncancer effects.

Mandates the department revise cleanup criteria by March 31, 2017 and every 6 months thereafter using current EPA-IRIS carcinogenic slope factors and noncarcinogenic reference doses, incorporating knowledge from research and best practices from other states.

Allows remedial actions to use probabilistic or statistical methods to evaluate environmental data when determining compliance with cleanup criteria if methods are reliable and scientifically valid.

Exempts manufacturing facilities (NAICS Sector 31-33) from indoor air inhalation criteria if they comply with Michigan occupational safety and health standards and maintain hazard communication programs.