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U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 63Subpart QQ - Subpart QQ—National Emission Standards for Surface Impoundments
§ 63.940 - Applicability.
§ 63.941 - Definitions.
§ 63.942 - Standards—Surface impoundment floating membrane cover.
§ 63.943 - Standards—Surface impoundment vented to control device.
§ 63.944 - [Reserved]
§ 63.945 - Test methods and procedures.
§ 63.946 - Inspection and monitoring requirements.
§ 63.947 - Recordkeeping requirements.
§ 63.948 - Reporting requirements.
§ 63.949 - Implementation and enforcement.
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