(2) If a public body and the department cannot agree on the sum to be paid under subsection (1) of this section, the sum to be paid shall be determined by three appraisers, one appointed by the public body, one by the department, and the third by the first two, and their determination shall be final. The cost of the third appraiser shall be borne equally by the public body and the department. [1963 c.376 §5; 1965 c.375 §4; 1967 c.82 §1; 1973 c.203 §4]