Class II: one of the officials of the municipality, other than a member of the governing body, to be appointed by the Mayor, provided that if there is an Environmental Commission, the member of the Environmental Commission who is also a member of the Planning Board as required by N.J.S.A. 40:56A-1 shall be deemed to be the Class II Planning Board member for purposes of this chapter in the event that there is among the Class IV or alternate members of the Planning Board both a member of the Zoning Board of Adjustment and a member of the Board of Education.