It's seems most likely the run off is from the ruptured tanks, petroleum lube oil, diethylene glycol, polypropyl glycol, and butyl acrylates. And likely primarily the non flammable ones, the oil and the glycols.
Unless you were onsite testing what was in the runoff and have the results, you're speculating.
Clearing the first hurdle is hard, clearing the second is even harder.