This final rule, issued pursuant to section 8(d) of the Toxic Substances Control Act (TSCA), requires manufacturers (including importers) of the chemicals listed in this document in the category of voluntary High Production Volume (HPV) Challenge Program orphan (unsponsored) chemicals to report certain unpublished health and safety data to EPA. The Interagency Testing Committee (ITC), established under section 4(e) of TSCA to recommend chemical substances and 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 voluntary HPV Challenge Program orphan (unsponsored) chemicals to the Priority Testing List in its 55<SUP>th</SUP> and 56<SUP>th</SUP> ITC Reports, as amended by deletions to this list made in its 56<SUP>th</SUP> and 58<SUP>th</SUP> ITC Reports. In addition, EPA is making technical corrections to update the EPA addresses to which submissions under the health and safety data reporting rule must be mailed or delivered. This update reflects the completion of the Agency's move to the Federal Triangle complex in Washington, DC.