This it not a test or a drill, and even if it was, it says little about the response to a much larger spill. There's not much to do with a sheen. Any oil in the water is bad. Prevention is the key.  Recovering 400 gallons of oil.water mix means little when it's 1% oil. And for some reason we don't know exactly how much oil entered the water because of some maintenance chaos at a valve.

Only thing working good is probably the Incident Command System with scheduled press releases to help strerilize the issue.