Normally, all appointments to jobs or positions assigned to the classified service shall be probationary for a period of six months from the date of an individual’s initial hire date. Before the expiration of the probationary period, the appointing authority may discharge any probationer in his or her department or office upon written notification to the board. If the probationer is not discharged before the expiration of his or her probationary period, his or her appointment shall be deemed complete and he or she shall be designated as a regular status employee in the classified service of the county.