So I was hired PT Preload in November '14. Not seasonal, it was On-Call but I would stay on after peak. Anyways, I continued to call in every morning an hour before hand to see if I was needed, which, half the time I wasn't and had no other work lined up. Anyways, one of the seasonal drivers was hired back on for Preload in January '15, but they kept me on call and had him working 5 days a week. I was "On-Call" for roughly 4 months. It took me until May 5th to reach 70 days. Well, he started driver training this week because he hit seniority before I did. Does the seniority date go back to your start date once you pass the probationary period? Do I have a grievance for them working him over me during the probationary period?