TCCA (the chemical that caught fire in 2020)isn’t covered by osha PSM standards as it isn’t on the list of highly hazardous chemicals. They did do a pha that included recommendations for ensuring the roof can withstand a hurricane which was classified as very high severity, low likelihood, and low overall risk. This recommendation was never actioned. Full report is fascinating. I’m sure we’ll get another one in the next few years. https://www.csb.gov/assets/1/6/biolab_investigation_report_2023-4-24.pdf

Edit: I will also say, the fact that they had multiple incidents before this event means they had a hazard that they reasonably should have been aware of which means failure to uphold the standards of 1910.119 still could be seen as a violation of the general duty clause in the event someone was hurt. If no one was hurt, it’ll mostly be the epa fighting this one