The Environmental Protection Agency (EPA) is taking final action to modify the list of regulated substances and threshold quantities authorized by section 112(r) of the Clean Air Act as amended. EPA is vacating the listing and related threshold for hydrochloric acid solutions with less than 37% concentrations of hydrogen chloride. The current listing and threshold for all other regulated substances, including hydrochloric acid solutions with 37% or greater concentrations and the listing and threshold for anhydrous hydrogen chloride, are unaffected by today's rulemaking. Today's action implements, in part, a settlement agreement between EPA and the General Electric Company (GE) to resolve GE's petition for review of the rulemaking listing regulated substances and establishing thresholds under the accidental release prevention regulations.