(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

(1) during the payroll period to employees in positions for which coverage has been terminated;

(2) at the time of termination to employees in positions for which coverage has been terminated; or

(3) during the corresponding payroll period for the fiscal year ending June 30, 2008, to employees in positions for which coverage has been terminated.

(b) Notwithstanding (a) of this section, the administrator may enter into a payment plan acceptable to the administrator for payment of an employer's liability for termination costs. Termination costs not paid as prescribed by (a) of this section or in accordance with an approved payment plan may be collected by the administrator in accordance with AS 39.35.610(b).

(c) An employer requesting termination of all participation in the plan, termination of participation in the plan of a department, group, or other classification of employees, or a payment plan for payment of termination costs shall pay the cost associated with obtaining a termination cost study associated with the employer's termination.