When the requirement for sick leave is known to the employee in advance of his/her absence, the employee shall request authorization for sick leave at such time, in the manner hereinafter specified. In all other instances the employee shall notify his/her supervisor as promptly as possible by telephone or other means. Before an employee may be paid for the use of accrued sick leave he/she shall complete and submit to his/her department head a request with the dates and hours of absence and such other information as is necessary for the request to be evaluated. If an employee does not return to work prior to the preparation of the payroll, other arrangements may be made with the approval of the department head and the Controller. The sick leave form shall be treated confidentially and be kept in a confidential file. The department head may require a physician’s statement from an employee who applies for sick leave or make whatever investigation into the circumstances that appears warranted before taking action on the request.