1. (a) Post-closure cost estimate required. Post-closure cost estimates shall be submitted to the DEQ for approval. The estimate shall be a detailed written estimate, in current dollars, of the cost of hiring a third party to conduct post-closure care for the CCR unit in accordance with the permit, the approved post-closure plan, and the rules of this Chapter.
2. (b) Amount. The cost estimate shall be set by the DEQ and equal the most expensive cost for post- closure care, as indicated by the post-closure plan.

3. (c) Determination of post-closure cost estimate.

   1. (1) Post-closure cost estimates shall be determined in accordance with OAC 252:517-17-51.
   2. (2) A copy of the cost estimate shall be submitted to the DEQ for approval.
   3. (3) A copy of the approved estimate shall be placed in the operating record.
4. (d) Increases required. Post-closure cost estimates and the amount of financial assurance provided must be increased if, at any time during the active life, changes to the post-closure plan or facility conditions increase the maximum cost of post-closure care.

5. (e) Reduction allowed. Proposals for reduction of post-closure cost estimates and the amount of financial assurance required may be approved by the DEQ.

   1. (1) Estimate exceeds cost. To qualify for a reduction, the cost estimate must be demonstrated to exceed the maximum cost of post-closure during the remaining life of the facility.
   2. (2) Adequate assurance remains. The amount of security remaining after the reduction must adequately cover the estimated post-closure cost yet to be performed.
   3. (3) DEQ approval required. Financial assurance shall not be reduced until DEQ approval has been granted.

Added at 33 Ok Reg 1469, eff 9-15-16