020-3 Wyo. Code R. § 3-7
All facilities shall be closed in accordance with the standards described in this section, as well as the requirements of Chapter 1, Section 2(g) and 2(h).
(a) Commencement of closure : Closure activities as specified in this section and in the approved facility closure plan shall commence at a time no later than nine (9) months following the time the facility ceases to receive solid wastes. Closure shall be promptly completed, and in no case shall completion of the required closure activities exceed twelve (12) months following commencement of such closure activities, unless the administrator approves interim measures and delayed final closure upon petition by the operator.
(b) Notification of closure : Prior to the commencement of closure activities, a notice of closure shall be published in an area newspaper and posted at all facility access points, if the facility has been used by the general public.
(c) Prevention of erosion or ponding problems : Facilities shall be engineered to inhibit future problems with erosion or ponding of surface water over filled areas. This may be done via site grading and revegetation, placement of rip rap or other appropriate means.
(d) Final cover : At closure, an infiltration barrier layer of subsoil, or a combination of materials as specified in the permit, a minimum of two (2) feet thick shall be constructed over the refuse or any intermediate cover already in place. This infiltration barrier layer shall be covered with a minimum of six (6) inches of topsoil and graded to prevent erosion or surface water ponding. The infiltration barrier layer shall be constructed to minimize the total amount of moisture and the rate at which moisture infiltrates the final cover system. The administrator may specify more stringent specification if the administrator determines that the site poses a significant threat to public health or the environment.
(e) Revegetation : At closure, any portion of the facility that has been disturbed by solid waste disposal activities shall be reveg-etated to minimize wind and water erosion of the final cover, consistent with the post-closure land use. Vegetation shall be a diverse mix selected to be compatible with the climatic conditions, require little maintenance, and have root depths that will not exceed the depth of the final cover.
(f) Surveyed corners : At closure, all facility boundary corners for facilities greater than one (1) acre in size shall be surveyed and marked with permanent survey caps.
(g) Notice on deed : At closure, an instrument which clearly gives notice of the restrictions that apply to future activities on the disposal facility property shall be filed for recording by the registrar of deeds (county clerk) in the county where the facility is located. Wording of such an instrument shall indicate that the property has been used as a solid waste disposal facility. This shall be recorded prior to any property transaction resulting in another use for the property. The owner/operator, or its successors, shall assure that post-closure use of the property shall be restricted to prevent any disturbance to the facility's containment system including caps and liners, or the functioning of the facility's monitoring system.
(h) Access control : Facility fences, gates and any other access restrictions shall be maintained until the site has been satisfactorily closed and revegetated, if post-closure land use requires establishment of vegetative cover.
(i) Waste containment systems : Waste containment systems, including but not limited to liners, leachate detection, collection and management systems and final cover systems shall be maintained throughout the closure and post-closure periods.
(j) Surface water structures : Surface water structures shall be maintained and operated throughout the closure and post-closure periods.
(k) Environmental monitoring systems : Environmental monitoring systems shall be maintained and operated throughout the closure and post-closure periods.
(l) Corrective action systems : The operator shall respond to any pollution problem reasonably related to the facility's activities. Corrective action systems shall be maintained and operated throughout the closure and post-closure periods.
(m) Special waste management standards : Any facility used for the management of a special waste regulated under Chapter 8, Special Waste Management Standards, shall also comply with the applicable closure standards established under Chapter 8.
(n) Transfer, treatment and storage facility standards : Any facility used for the transfer, treatment or storage of a solid waste shall also comply with the applicable closure standards established under Chapter 6.
(o) Certification of closure : Completion of closure activities shall be certified by a Wyoming registered professional engineer, as required by Section 2(h)(ii) of Chapter 1.
(p) Post-closure land use : Each facility shall be returned to the post-closure land use specified in the permit, unless an alternative use is approved by the administrator.
(q) Post-closure period : Section 6(b)(i) of this chapter shall extend for a period of not less than thirty (30) years after certification of closure activities is approved by the administrator. The minimum post-closure period may be terminated by the administrator at an earlier date if the administrator determines that the facility has been adequately stabilized and that the environmental monitoring or control systems have demonstrated that the facility closure is protective of public health and the environment consistent with the purposes of the act.
020-3 Wyo. Code R. § 3-7