020-14 Wyo. Code R. § 14-5
(a) Any bond or other form of financial assurance may be canceled by the surety only after ninety (90) days written notice to the director, and upon receipt of the director's written consent, which may be granted only when the requirements of the bond have been fulfilled.
(b) When the director determines that the violation has been remedied or the damage abated, the director shall release that portion of the bond or financial assurance instrument being held under W.S. 35-11-307 or W.S. 35-11306(d). When the director determines that closure activities have been successfully completed at any regulated facility, the director shall release that portion of the bond or financial assurance being held to guarantee performance of activities specified in W.S. W.S. 35-11-307 or W.S. W.S. W.S. 35-11-306(d). The remaining portion of the bond or financial assurance shall be held for a period of not less than five (5) years after the date of facility closure, or so long thereafter as necessary to assure proper performance of any post-closure and corrective activities specified in W.S. W.S. W.S. 35-11-307 or W.S. W.S. W.S. 35-11-306(d).
020-14 Wyo. Code R. § 14-5