Statutory authority and regulatory source for the risk management program

What is the statutory authority and the regulatory source for the risk management program regulations that are codified in 40 CFR Part 68?

The risk management program regulations were promulgated pursuant to the §112(r) accidental release prevention provisions of the Clean Air Act, as amended in 1990. The regulatory sources for the Part 68 requirements are the Risk Management Program final rule, which was signed on May 24, 1996, and published in the Federal Register on June 20, 1996 (61 FR 31668), and the List of Regulated Substances and Thresholds final rule, published in the Federal Register on January 31, 1994 (59 FR 4478).