Within 90 days of receipt of a complete application in proper form, together with the final site development plan, the Planning Board shall approve establishment of such uses upon determining compliance with conditions required by this chapter and, where appropriate, modify the nature or extent of the proposed use and development of the project to be consistent with this chapter or, on negative findings fully set forth in the record, shall deny such use. The Planning Board shall provide for public notice and hearing on any application for conditional use. Such hearing shall be scheduled within 45 days of the receipt of all required materials in proper form, and the Board shall decide the matter within 45 days after the close of the hearing, subject to the provisions of SEQRA or required permits. The time periods herein may be extended by mutual consent of the Board and applicant.