This final rule, issued pursuant to section 8(a) of the Toxic Substances Control Act (TSCA), requires certain manufacturers (including importers) of certain High Production Volume (HPV) Challenge Program orphan (unsponsored) chemicals to submit a one-time report on general production/ importation volume, end use, and exposure-related information to EPA. The Interagency Testing Committee (ITC), established under section 4(e) of TSCA to recommend chemicals and chemical mixtures to EPA for priority testing consideration, amends the TSCA Section 4(e) Priority Testing List through periodic reports submitted to EPA. The ITC recently added certain HPV Challenge Program orphan (unsponsored) chemicals to the Priority Testing List in its 55\th\ and 56\th\ ITC Reports, as amended by deletions to this list made in its 56\th\ and 58\th\ ITC Reports. Two tungsten oxide compounds were added to the Priority Testing List by the ITC in its 55\th\ ITC Report but were removed from the Priority Testing List in the 58\th\ ITC Report. In addition, EPA is making technical corrections to update the EPA addresses to which submissions under the Preliminary Assessment Information Reporting (PAIR) rule must be mailed or delivered. This update reflects the completion of the Agency's move to the Federal Triangle complex in Washington, DC.