Final Average Compensation Period. For employees with 10 or more years of services as of the Effective Date, the Final Average Compensation (FAC) amount is based on the last 24 months. For employees with less than 10 years of service as of the Effective Date, FAC amount is based on the last 48 months. However, in no event shall the FAC amount be less than it would have been using the 24 month period ending on the Effective Date;