The assets of the fund shall be held for the exclusive purpose of paying premiums and plan benefits and defraying reasonable expenses as described in this chapter and shall never inure or revert to the benefit of the county, with the exception that the county may recover contributions paid by a mistake of fact if recovery is sought within one year following the mistaken payment to the fund. (Added by Ord. 84-086 § 5, Aug. 6, 1984).