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unreimbursed eligible remediation costs, as specified in this subsection. For purposes of this Section, "unreimbursed eligible remediation costs" means costs approved by the Illinois Environmental Protection Agency ("Agency") under Section 58.14 of the Environmental Protection Act that were paid in performing environmental remediation at a site for which a No Further Remediation Letter was issued by the Agency and recorded under Section 58.10 of the Environmental Protection Act. The credit must be claimed for the taxable year in which Agency approval of the eligible remediation costs is granted. The credit is not available to any taxpayer if the taxpayer or any related party caused or contributed to, in any material respect, a release of regulated substances on, in, or under the site that was identified and addressed by the remedial action pursuant to the Site Remediation Program of the Environmental Protection Act. After the Pollution Control Board rules are adopted pursuant to the Illinois Administrative Procedure Act for the administration and enforcement of Section 58.9 of the Environmental Protection Act, determinations as to credit availability for purposes of this Section shall be made consistent with those rules. For purposes of this Section, "taxpayer" includes a person whose tax attributes the taxpayer has succeeded to under Section 381 of the Internal Revenue Code and "related party" includes the persons disallowed a SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468