Rule 3745-66-44 | Cost estimate for post-closure care.
(A) The owner or operator of a hazardous waste disposal unit shall have a detailed written estimate, in current dollars, of the annual cost of post-closure monitoring and maintenance of the facility in accordance with the applicable post-closure provisions in rules 3745-66-17 to 3745-66-21, 3745-67-28, 3745-67-58, 3745-67-80, and 3745-68-10 of the Administrative Code.
(1) The post-closure cost estimate shall be based on the costs to the owner or operator of hiring a third party to conduct post-closure care activities. A "third party" is a party who is neither a parent nor a subsidiary of the owner or operator (see the definition of "parent corporation" in rule 3745-66-41 of the Administrative Code).
(2) The post-closure cost estimate is calculated by multiplying the annual post-closure cost estimate by the number of years of post-closure care required under rule 3745-66-17 of the Administrative Code.
(B) During the active life of the facility, the owner or operator shall adjust the post-closure cost estimate for inflation within sixty days prior to the anniversary date of the establishment of the financial instruments used to comply with rule 3745-66-45 of the Administrative Code. For owners or operators using the financial test or corporate guarantee, the post-closure care cost estimate shall be updated for inflation no later than thirty days after the close of the firm's fiscal year and before submittal of updated information to the director as specified in paragraph (D)(5) of rule 3745-66-45 of the Administrative Code. The adjustment may be made by recalculating the post-closure cost estimate in current dollars or by using an inflation factor derived as specified in 40 CFR 265.144(b). The inflation factor is the result of dividing the latest published annual deflator by the deflator for the previous year.
(1) The first adjustment is made by multiplying the post-closure cost estimate by the inflation factor. The result is the adjusted post-closure cost estimate.
(2) Subsequent adjustments are made by multiplying the latest adjusted post-closure cost estimate by the latest inflation factor.
(C) During the active life of the facility, the owner or operator shall revise the post-closure cost estimate no later than thirty days after a revision to the post-closure plan which increases the cost of post-closure care. If the owner or operator has an approved post-closure plan, the post-closure cost estimate shall be revised no later than thirty days after the director has approved the request to modify the plan, if the change in the post-closure plan increases the cost of post-closure care. The revised post-closure cost estimate shall be adjusted for inflation as specified in paragraph (B) of this rule.
(D) The owner or operator shall keep at the facility during the operating life of the facility the latest post-closure cost estimate prepared in accordance with paragraphs (A) and (C) of this rule and, when the estimate has been adjusted in accordance with paragraph (B) of this rule, the latest adjusted post-closure cost estimate.
[Comment: For dates of non-regulatory government publications, publications of recognized organizations and associations, federal rules, and federal statutory provisions referenced in this rule, see rule 3745-50-11 of the Administrative Code titled "Incorporated by reference."]
Last updated January 16, 2026 at 8:40 AM
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