On January 7, 2024, an incident at Atalco released approximately 410 gallons of slurry mixture. Of that mixture, 27 gallons were estimated to be caustic soda. Four (4) maintenance works sustained serious chemical burns to their bodies. EPA requested documentation on April 18, 2024, and Respondent provided on May 17, 2024, information concerning the Incident and Respondent?s compliance with Section 112(r) of the CAA 42 U.S.C. ? 7412(r), and 40 C.F.R. Part 68 (the ?Investigation?).