The department shall serve as the agency of registration for professional soil classifiers and added to its duties shall be the administration of the provisions of this chapter. The department shall appoint an advisory council of five qualified professional soil classifiers who shall have the qualifications required in Section 40-65-30 to recommend certification of those eligible to become registered soil classifiers. One of these five persons shall be the chief soil scientist of the department. The other four members of the advisory council shall be appointed for five years and until their successors have been appointed and qualify, provided that the initial terms shall be made so that the term of one member shall expire on June thirtieth of each year.