Within thirty (30) days after the receipt of an application, the Responsible Authority shall either approve or disapprove the application in conformance with the provisions of this Zoning Ordinance. One (1) copy of the plans shall be returned to the applicant by the Responsible Authority, after he or she marks such copy either as approved or disapproved and attests to same by his/her signature on such copy. One (1) copy of plans, similarly marked, shall be retained by the Responsible Authority. The Responsible Authority shall issue a placard to be posted in a conspicuous place on the property in question, attesting to the fact that the use or alteration is in conformance with the provisions of this Ordinance.