Newly hired employees shall have no seniority during their probationary period, but upon completion of the probationary period their seniority date shall be the date of hire. Employees in classifications included in Section 2115.02, “Classifications”, shall be probationary employees for a period of one thousand five hundred and sixty (1,560) actual hours worked after successful completion of on the job training. Said employees shall not receive any fringe benefits during the initial one hundred and sixty (160) actual work hours of employment, but shall be entitled to full fringe benefits thereafter.