When the ZEO determines that any buildings or use of premises is in violation of this chapter, he shall issue an order to remedy violation, specifying the nature of the violation, the remedy ordered, the time permitted for such correction and the legal penalties which may be invoked by the Town. The order to remedy shall be served upon a responsible party, either personally or by delivering the order to a person of suitable age and discretion at the property in violation, and by mailing the order to the person to be served at his last known address.