Here is an example of a non-renewal letter for a APIR that was done for a department (Some info is redacted). This is a good template to go off of.
According to the AAUP contract, notice of non-renewal of a one-year appointment shall be afforded according to the schedule listed below.
Probationary employees shall receive fourteen (14) calendar days’ notice;
After one (1) year of probationary employment, thirty (30) calendar days’ notice;
After one (1) year of non-probationary employment: sixty (60) calendar days’ notice;
After continuous non-probationary employment of three (3) or more years: one hundred twenty (120) calendar days’ notice;