In the event the development plan, as submitted, contains variations from the development plan given tentative approval, the Township Supervisors may refuse to grant final approval and shall, within 45 days from the filing of the application for final approval, so advise the landowner in writing of said refusal, setting forth in said notice the reasons why one or more of said variations are not in the public interest. In the event of such refusal, the landowner may either refile his application for final approval without the variations objected to, or file a written request with the Township Supervisors that it hold a public hearing on his application for final approval. If the landowner wishes to take either such alternative action, he may do so at any time during which he shall be entitled to apply for final approval, or within 30 additional days if the time for filing for final approval shall have already passed at the time when the landowner was advised that the development plan was not in substantial compliance. In the event the landowner shall fail to take either of these alternate actions within said time, he shall be deemed to have abandoned the development plan. Any such public hearing shall be held pursuant to public notice within 30 days after request for the hearing is made by the landowner, and the hearing shall be conducted in the manner prescribed in this chapter for public hearings on applications for tentative approval. Within 30 days after the conclusion of the hearing, the Township Supervisors shall by official written communication either grant final approval to the development plan or deny final approval.