OP, call and ask, paperwork is NO cost and typically 2 week turn around. If you are removing a plant I am guessing you will be told OK, if you are making more changes better to be safe than sorry. As for the "fine", there is no fine, but if someone complains you might have to undo all of your work....
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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