Evaluation by independent consultants. Upon submission of an application for special permit for a communication (personal wireless service) facility or tower, the Planning Board may retain an independent consultant, as a reasonable rate to be paid by the applicant, to assist the Planning Board and its usual consultants, the Town Planning Consultant and the Town Engineer, in technical review of the application. The consultant shall be a qualified professional in one or more of the following fields: telecommunications engineering, structural engineering, monitoring of electromagnetic fields, or other relevant field deemed essential by the Planning Board.