Upon the completion of each section of the development as set forth in the approved general development plan, the developer shall notify the administrative officer, by certified mail, as evidence that the developer is fulfilling his obligations under the approved plan. For the purposes of this section, "completion" of any section of the development shall mean that the developer has acquired a certificate of occupancy for each structure, as set forth in the approved general development plan. If the administrative officer does not receive such notification at the completion of any section of the development, the administrative officer shall notify the developer, by certified mail, in order to determine whether the terms of the approved plan are being complied with. If a developer does not complete any section of the development within eight months of the date provided for in the approved plan, or if at any time the administrative officer has cause to believe that the developer is not fulfilling his obligations pursuant to the approved plan, the administrative officer shall notify the developer, by certified mail, and the developer shall have 10 days within which to give evidence that he is fulfilling his obligations pursuant to the approved plan. The Planning Board thereafter shall conduct a hearing to determine whether or not the developer is in violation of the approved plan. If, after such a hearing, the Planning Board finds good cause to terminate the approval, it shall provide written notice of same to the developer and the approval shall be terminated 30 days thereafter.