Positions becoming vacant unless excepted as provided by § 506.7, will be reviewed to determine the feasibility of converting them to part-time. Among the criteria which may be used when conducting this review are:

(a) Mission requirements and occupational mix.

(b) Workload fluctuations.

(c) Employment ceilings and budgetary considerations.

(d) Size of workforce, turnover rate and employment trends.

(e) Affirmative action.