The County Board shall review the final plat and shall either approve or disapprove the plat. Approval however, shall not be granted unless the following conditions are met:
(A) The final plat conforms to the preliminary plat approved previously.
(B) The final plat meets the design standards and engineering specifications set forth herein.
(C) The final plat meets all requirements of the laws of the State ofIllinois.
(D) The subdivider or applicant posts a performance bond or Irrevocable Letter of Credit with the County equal to the estimated cost of all improvements for construction, maintenance and operation, as the case may be.