Below you will find the handbook with all of the official rules regarding faculty evaluation.
Part One, on pages 11-29, covers tenure-track faculty evaluations.
Part Two is from pages 31 to 53, and it covers part-time and tenured faculty evaluations.
Peralta Faculty Evaluations Handbook
Faculty-Evaluations-Handbook-revised-March 2018
If an instructor teaches in more than one discipline within the same department and if both the instructor and the department chair agree, the instructor can have one evaluation count for both or all disciplines. (This is new as of December 2016.) Use this form:
agreement-for-placement-in-preferred-hiring-pool-for-multiple-disciplines
The Faculty Evaluation Handbook can also be found here on the Peralta Federation of Teachers website.