Within 30 days after the receipt of an application, the Zoning Inspector shall either approve or disapprove the zoning permit application in conformance with the provisions of this Zoning Code. All zoning permits shall, however, be conditional upon the commencement of work within one year. One copy of the plans shall be returned to the applicant by the Zoning Inspector after the Zoning Inspector has marked such copy either as approved or disapproved and attested to same by his or her signature on such copy. One copy of plans similarly marked shall be a placard to be posted in a conspicuous place on the property in question attesting to the fact that the activity is in conformance with the provisions of this Zoning Code.