EPA intends to propose a significant new use rule (SNUR) under section 5(a)(2) of the Toxic Substances Control Act (TSCA) for long-chain perfluoroalkyl carboxylate (LCPFAC) chemical substances, and for perfluorooctanoic acid (PFOA) or its salts. EPA also intends to propose to make the article exemption inapplicable to the import of certain identified chemical substances. In addition, EPA is also intends to propose an amendment to a SNUR for perfluoroalkyl sulfonate (PFAS) chemical substances that would make the article exemption inapplicable to the import of PFAS chemical substances as part of carpets. The SNUR would require persons who intend to manufacture, import, or process these chemicals for an activity that is designated as a significant new use by the proposed rule to notify EPA at least 90 days before commencing that activity. The required notification would provide EPA with the opportunity to evaluate the intended use and, if necessary, to prohibit or limit that activity before it occurs to prevent unreasonable risk to human health or the environment.