The state treasurer may specify by means of a prospectus, or supplement thereto, such terms and conditions not otherwise set forth in the administrative code applicable to the management and operation of the pool and/or any subpool, including investment policies, restrictions, objectives not inconsistent with WAC 210-10-110, contributions, the crediting of income, gain or loss, the allocation of liabilities among subpools, and withdrawals and contributions among subpools, as the state treasurer may deem appropriate, from time to time. Material changes to a prospectus may be made by the state treasurer by means of a supplement or restated prospectus, effective as of the date sent to pool participants or as of the later date stated therein.