The term of the member composing Class I shall correspond to his official tenure. The term of the member comprising Class II shall be for one year or terminate at the completion of his/her respective term of office, whichever occurs first, except for a Class II member who is also a member of the Environmental Commission. The term of a Class II or Class IV member who is also a member of the Environmental Commission shall be for three years or terminate at the completion of his term of office as a member of the Environmental Commission, whichever comes first. The term of a Class IV member who is also a member of the Board of Education shall terminate whenever he is no longer a member of such other body or at the completion of his Class IV term, whichever occurs first. The terms of all Class IV members shall be so determined that to the greatest practicable extent the expiration of such terms shall be distributed evenly over the first four years after their appointment, provided that the initial Class IV term of no member shall exceed four years. Thereafter, the Class IV term of each such member shall be four years. If a vacancy in any class shall occur otherwise than by expiration of the Planning Board term, it shall be filled by appointment, as above-provided, for the unexpired term. All terms shall run from January 1 of the year in which the appointment was made. No member of the Planning Board shall be permitted to act on any matter in which he has, either directly or indirectly, any personal or financial interest. Any member other than a Class I member after a public hearing, if he requests one, may be removed by the governing body for cause. Nothing in this chapter shall, however, be construed to affect the terms of any present members of the Planning Board, all of whom shall continue in office until the completion of the terms for which they were appointed.