Vacation must be requested of and approved by your supervisor in advance. Your supervisor can determine how they would like to receive these requests. For example Juliana will accept requests in the departmental form, text, phone call, or email. But all must be followed up with a form.
A vacation leave balance of at least one week (40 hours) should be maintained at all times. Supervisors may choose to not grant leave requests if the employee has less than 40 hours of leave in their "bank".