Reminder that the US Chemical Safety Board does great investigations into these kinds of accidents. Here’s a famous one from 2007 involving methylcyclopentadienyl manganese tricarbonyl (a gasoline additive) at T2 Laboratories in Jacksonville Florida. The CSB has a long record of producing great investigative videos without any partisan or legal bias, as the one shown here demonstrates:

https://www.csb.gov/t2-laboratories-inc-reactive-chemical-ex...

This agency is the subject of a budget war between the current executive and Congress, with the former trying to cut its budget and the Congress just restoring its budget, so not sure if it will be doing a report on Garden Grove:

https://www.chemistryworld.com/news/congress-rescues-industr...

See also: https://news.ycombinator.com/item?id=46904017