Yes, yes I know about the rules etc. My point is, I have never seem DEQ get involved in a situation involving a controlled burn involving natural vegetation, or for that matter a controlled burn that went rogue.
However, when a large chemical company caught fire here, DEQ was all over it.
And they probably won't unless they are called. They stay out of sight. If they are called, they will respond. The reason I know about them and their regs is before I retired, I had to deal with them on several occasions about issues in what we called "no mans land". The section I've been talking about is air quality. I'm sure they have a section to deal specifically with oil field or chemical issues.