September 14, 2021

Draft Guidance on Subpart BB and CC Applicability

In 2017, EPA’s Office of Enforcement and Compliance Assurance launched its national compliance initiative to reduce organic emissions from equipment managing hazardous waste. This initiative renewed the focus on compliance with RCRA’s air emission standards found in Parts 264/265 Subparts AA, BB, and CC. Though Subparts BB and CC are more than 25 years old, there is still confusion on their scope. To clarify the issue, EPA released a draft document for public comment on August 4, 2021. Comments and questions may be submitted via email to RCRApost@epa.gov until October 3, 2021.

Subparts BB and CC, though similar in goal, regulate different equipment. Subpart BB establishes organic air emission controls for equipment leaks—achieved by regulating ancillary equipment such as valves and pressure relief devices. Subpart CC establishes controls for tanks, containers, and surface impoundments and regulates the closure devices of those units. EPA acknowledges the term “closure device”, which includes both conservation vents and safety devices, is similar to certain equipment regulated by Subpart BB. The agency uses an example of a hazardous waste tank with level 1 controls to demonstrate when Subpart BB vs. Subpart CC applies. In essence, Subpart CC applies when the closure device is specifically associated with the roof, or cover, of the tank. Other equipment not satisfying the definition of “closure device” (e.g., a valve on the side of a tank) is subject to Subpart BB.

 


©2021 McCoy and Associates, Inc. All rights reserved.

McCoy and Associates has provided in-depth information to assist environmental professionals with complex compliance issues since 1982. Our seminars and publications are widely trusted by environmental professionals for their consistent quality, clarity, and comprehensiveness.

 

Disclaimer

Considerable care has been exercised in preparing this document; however, McCoy and Associates, Inc. makes no representation, warranty, or guarantee in connection with the publication of this information. McCoy and Associates, Inc. expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal law or regulation with which this information may conflict. McCoy and Associates, Inc. does not undertake any duty to ensure the continued accuracy of this information.

This document addresses issues of a general nature related to the federal RCRA regulations. Persons evaluating specific circumstances dealing with the RCRA regulations should review state and local laws and regulations, which may be more stringent than federal requirements. In addition, the assistance of a qualified professional should be enlisted to address any site-specific circumstances.