Sick leave shall accrue at the rate of one day for each month for each regular employee to a maximum accumulated sick leave of 120 days; however, the severance benefit provided in PMC 2.105.170 shall be based on the product of 25 percent times the accrued number of sick leave days up to a total of 90 days. This section shall not apply to an employee who is a member of a collective bargaining unit having an agreement with the City. This subject shall be determined exclusively by the terms of the contract. [Ord. 2053 § 3, 1979; Ord. 1458 § 5, 1971; Ord. 1306 § 45, 1968; Code 1970 § 2.42.310.]