The board of retirement and both the board of retirement and the board of investment may appoint such administrative, technical, and clerical staff personnel as are required to accomplish the necessary work of the boards. The appointments shall be made from eligible lists created in accordance with the civil service or merit system rules of the county in which the retirement system governed by the boards is situated. The personnel shall be county employees and shall be subject to the county civil service or merit system rules and shall be included in the salary ordinance or resolution adopted by the board of supervisors for the compensation of county officers and

employees.