he Bond or an Irrevocable Letter of Credit shall remain in effect until such time as the County Clerk shall, by written authorization to the County Treasurer, release the surety from the obligation of the bond, which release may be partial and may occur from time to time, as improvements are completed and approved; provided, however:
(A) Authorization to release up to ninety percent (90%) of the bond amount or the Irrevocable Letter of Credit may be authorized by theCountyClerk upon written notification from the County Engineer. Such authorization by theCountyEngineer shall only be given as improvements are installed equal in value to funds released.
(B) The remaining ten percent (10%) may only be released when theCountyEngineer notifies the Zoning Officer, in writing, that all improvements have been completed in a satisfactory manner. The Administrative Officer shall then notify the County Clerk that authorization may be given to release all funds. Whenever improvements are to be dedicated to another authority, school district, road district, park or other government, such improvements shall be accepted or approved before the release of all funds.