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.