The Planning Board shall make the rules governing such hearings. Any maps and documents for which approval is sought at a public hearing shall be on file and available for public inspection at least 14 days before the date of the public hearing during normal business hours in the office of the administrative officer or at such other place in the Borough Hall as the Planning Board may designate. The applicant or appellant may produce other documents, records, or testimony at the public hearing to substantiate, clarify or supplement the previously filed maps and documents. An application for development shall not be deemed to be a complete application for development until all documents, records, plats, application forms, fees and other requirements of this chapter, and other ordinances of the Borough of Allentown to which this chapter applies, shall be filed or made part of the record at a public hearing, or receipt thereof by the Board is acknowledged at a public hearing.