Alaska Stat. § 39.35.625
(a) Notwithstanding AS 39.35.255, an employer that terminates participation of a department, group, or other classification of employees in the plan under AS 39.35.615 or that terminates participation in the plan under AS 39.35.620 shall pay to the plan each payroll period until the past service liability of the plan is extinguished an amount calculated by applying the current past service contribution rate adopted by the board to the greater of total base salaries paid