The executive director shall be in charge of the general administration of the fund. He shall have such special powers and duties as may be properly delegated or assigned by the board from time to time. Such general administrative duties shall include: the computation of the amounts of annuities, benefits, prior service credits and contributions required for reinstatement of credits for board consideration; the processing of approved benefit claims and expenses of administration for payment; the placing of any and all matters before the board which require action or are in the interest of the board or the fund; the preparation and maintenance of necessary and proper records for administrative and actuarial purposes; the conduct of any necessary or desirable communications in the course of operations of the fund; and the carrying out of any actions of the board which are so delegated.