Under the Toxic Substances Control Act (TSCA), EPA is promulgating a significant new use rule (SNUR) to add nine benzidine- based chemical substances to the existing SNUR on benzidine-based chemical substances. With respect to both the newly-added benzidine- based chemical substances and the previously-listed benzidine-based chemical substances, this rule makes inapplicable the exemption relating to persons that import or process substances as part of an article. EPA is also promulgating a SNUR for di-n-pentyl phthalate (DnPP) and a SNUR for alkanes, C<INF>12-13</INF>, chloro. These actions require persons who intend to manufacture (defined by statute to include import) or process these chemical substances for an activity that is designated as a significant new use to notify EPA at least 90 days before commencing such manufacture or processing. The required notifications will provide EPA with the opportunity to evaluate activities associated with a significant new use and, if necessary based on the information available at that time, an opportunity to protect against potential unreasonable risks, if any, from that activity before it occurs. EPA is also making a technical amendment to the codified list of control numbers for approved information collection activities so that it includes the control number assigned by the Office of Management and Budget (OMB) to the information collection activities contained in this rule.