The secretary of the board shall be in charge of the administration of the detailed affairs of the retirement system and, in addition to the other powers and duties as are properly delegated by the board, shall:

    (a) Collect and record the receipt of all payments to the retirement system, including member contributions, state contributions, interest and principal collections on investments as they become due and payable, and other funds accruing to the retirement system, and immediately deposit them with the state treasurer for the account of the retirement system.

    (b) Sign vouchers requesting warrants upon the state treasurer pursuant to resolutions of the board, authorizing payment of benefits, refunds, and expenses out of funds belonging to the retirement system.

    (c) Certify to the proper authority the names of the persons from whom deductions are to be made and the amounts or rates of the contributions to be deducted.