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As part of EPA's continuing efforts to implement the Frank R. Lautenberg Chemical Safety for the 21st Century Act, which amended the Toxic Substance Control Act (TSCA) with immediate effect upon its enactment on June 22, 2016, EPA is developing a final rule to implement the TSCA requirement that EPA designate chemical substances on the TSCA Chemical Substance Inventory as either "active" or "inactive" in U.S. commerce. On January 13, 2017, EPA issued a proposed rule that would require a retrospective electronic notification of chemical substances on the TSCA Inventory that were manufactured (including imported) for non-exempt commercial purposes during the ten-year time period ending on June 21, 2016. EPA would also accept such notices for chemical substances that were processed. EPA would use these notifications to distinguish active substances from inactive substances. EPA would include the active and inactive designations on the TSCA Inventory and as part of its regular publications of the Inventory. EPA also proposed to establish procedures for forward-looking electronic notification of chemical substances on the TSCA Inventory that are designated as inactive, if and when the manufacturing or processing of such chemical substances for non-exempt commercial purposes is expected to resume. Upon receipt of a valid notice, EPA would change the designation of the pertinent chemical substance on the TSCA Inventory from inactive to active. EPA proposed procedures regarding the manner in which such retrospective and forward-looking activity notifications must be submitted, the details of the notification requirements, exemptions from such requirements, and procedures for handling claims of confidentiality. By statute, the notification deadline is 180 days after publication of the final rule in the Federal Register.