Spills
When we had a spill of diesel out of a generator that had been overfilled in Deemeber and the hot weather in July set in with predictable results.,when I was in the Army; the civy enviro contractor showed up with kitty litter-not the clumping kind. They also spread out a few berms, and then presented me with a $1500 bill for their service.
Wood chips are OK as well, especially if they are small and dried, sort of like sawdust.
It is important you do something around here, because if it can be shown you did not demonstrate "due diligence", even after the fact, the feds can and will come after you as an individual usually under the clean water act.