Class IV. Eight other citizens of the Township to be appointed by the Mayor. The members of Class IV shall hold no other municipal office, except that one member may be a member of the Zoning Board of Adjustment and one member may be a member of the Board of Education. A member of the Environmental Commission who shall also be a member of the Planning Board, shall be a Class IV member, unless the Class IV membership includes both a member of the Zoning Board of Adjustment and a member of the Board of Education, in which case the member of the Environmental Commission shall be the Class II Planning Board Member. Of the eight members, two shall be appointed as alternate members. Alternate members shall be designated by the Mayor at the time of their appointment as "Alternate No. 1" and "Alternate No. 2". In the event that a choice must be made as to which alternate is to vote, Alternate No. 1 shall vote.