A. The city manager;

B. All department heads and the principal appointive officials of the city as set forth in Section 25 of the Charter;

C. The human resources manager;

D. The assistant city attorneys;

E. Elective officers;

F. Members of appointive boards, commissions and committees;

G. Persons engaged under contract to supply expert, professional, technical or other services;

H. Volunteer personnel;

I. Emergency employees who are hired to meet the immediate requirements of an emergency condition, such as extraordinary fire, flood or earthquake which threatens life or property;

J. Employees who do not hold a regular position in the service of the city. A "regular" position is defined as a position created by the city council and assigned to any existing classification within the classification plan. A regular employee is one who holds a regular position and who has successfully completed his or her probationary period, while a probationary employee is one who holds a regular position during a probationary period.