Amendments to the Wool Fiberglass Manufacturing source category were finalized on July 29, 2015. The risk assessment was conducted under the 2015 final rule, and no adjustments to that risk assessment are contemplated under this action. Due to industry's phase-out of formaldehyde on rotary spin (RS) lines, the industry data that were collected for the 2015 amendments were no longer relevant for technology review use. Consequently, due to the lack of accurate and complete data for such processes, that final rule did not include technology review for RS lines. Prior to signature of the final rule, the EPA began an information collection effort under Clean Air Act section 114 authority for the remaining RS lines in the wool fiberglass manufacturing industry. The results of the emissions testing on the three remaining RS lines are being used to review the technology for this process and to amend the rule, if necessary, under this action.