Utah Code § 10-3-1011: Temporary employees.

The head of each department, with the advice and consent of the board of city commissioners, may employ any person for temporary work only, without making the appointment from the certified list, but the appointment may not be longer than one month in the same calendar year, and under no circumstances shall the temporary employee be appointed to a permanent position unless he shall have been duly certified by the civil service commission as in other cases.