Sign permit requirements. A sign permit shall be obtained from the Zoning Officer prior to the erection, alteration or relocation of any sign, billboard or other advertising device over four square feet in area. In applying for such permit, the applicant shall use the form provided by the Township, and shall include a plot plan of the property upon which such sign is located or proposed, showing the location of the street lines, cartway lines, and all signs already existing on the property, in order to facilitate the determination by the Zoning Officer that the sign to which the application relates complies with the provisions of this chapter approved by the Township Planning Commission.