Section 18-11-19 - Fund based upon actuarial tables - Treatment of forfeitures1. The pension fund must be based upon actuarial tables and the association is authorized to engage an actuary for studies of the plan when deemed necessary by the association.2. As required by section 401(a)(8) of the Internal Revenue Code; 26 U.S.C. 401(a)(8), no part of any benefit forfeitures of a member resulting from the application of any provisions of this chapter may be applied to increase the benefits a member would otherwise receive.