Okla. Stat. tit. 27A, § 27A-2-7-124: Monitoring of closed facility

After a hazardous waste facility has been closed, its owner or

operator shall properly maintain and monitor the hazardous waste

facility for a period of time required by rules of the Board and

shall make such repairs or improvements as deemed necessary by the

Department to ensure that no migration of hazardous waste material

will occur from the hazardous waste facility. The rules of the

Board which specify the period of time for maintenance and

monitoring of closed facilities shall be in compliance with the

hazardous waste regulations of the U.S. Environmental Protection

Agency pursuant to the federal Resource Conservation and Recovery

Act.