If the Planning Board disapproves or approves an application for an excavation permit or an application for an amended permit, any interested person affected by such decision may appeal to the Board for a rehearing on such decision or any matter determined thereby. The motion for rehearing shall fully specify every ground upon which it is alleged that the decision or order complained of is unlawful or unreasonable and said appeal shall be filed within 10 days of the date of decision appealed from. The Planning Board shall either grant or deny the request for rehearing within 10 days. If the request is granted, a rehearing shall be scheduled within 30 days. Any person affected by the Board's decision on a motion for rehearing may appeal in accordance with the procedures specified in RSA 677:4-15.