Maybe like dredge spoils.
Oil and other things stirred up by dredging is not considered a spill.....it's already in the water. (Of course unless that obscure law was changed and not advertised like the original one)
So as long as it came from the water and goes right back in...no harm no foul.
But I would definitely call around as others have pointed out as my home marina does things and does't do things that other marinas claim are "law".
As with all things....always exceptions.
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