No employee contributions are required under the plan.
The annual contributions required under the provisions of the Act, as determined by the actuary in accordance with the Act, shall become the obligation of the employer and shall be paid into the pension fund by annual appropriations if financial aid from the commonwealth is not sufficient to meet the contribution required by the Act.
At no time shall it be possible for the plan assets to be used for or diverted to any purpose other than for the exclusive benefit of the participants and their beneficiaries, except that contributions made by the employer may be returned to the employer if:
A. 
The Internal Revenue Service determines that this plan is not initially qualified within the meaning of Code Section 401(a) and the contribution (reduced by any fund losses attributable thereto) is returned within one year of such determination;
B. 
The contribution was made due to a mistake of fact and the contribution (reduced by any fund losses attributable thereto) is returned within one year of the mistaken payment of the contribution; or
C. 
The plan is terminated, as provided in Article XXII.