Within twenty-one (21) business days after the receipt of a complete and full application submission, the Director of Zoning or his/her authorized representative shall either approve or disapprove the application in conformance with the provisions of this Ordinance. One (1) copy of the plans shall be returned to the applicant as either approved or disapproved and attested to same by his or her signature on such copy. One (1) copy of the plans similarly marked shall be retained by the Director of Zoning or his/her authorized representative.