When an employee who has been working in a seasonal or extra help category is appointed to a permanent position they may receive credit for such extra help or seasonal period of service in computing accumulated sick leave, provided that no credit shall be given for service preceding any period of more than twenty-eight consecutive days in which an employee was not in a pay status.
If an employee who has unused sick leave accrued is laid off and subsequently reemployed in a permanent position, such sick leave credits shall be restored upon reemployment. No portion of sick leave credits for which an employee received compensation at the time of or subsequent to the day of layoff shall be restored.