ACTION

•  On September 13, 2017, the U.S. Environmental Protection Agency (EPA) finalized minor technical amendments to a tool used to evaluate hydrogen chloride (HCl) continuous emissions monitoring systems (CEMs) – known as Procedure 6. Procedure 6 specifies the minimum quality assurance requirements necessary for the control and assessment of the quality of CEMs HCl data used for compliance with regulatory requirements.
• Together with Performance Specification 18, Procedure 6 is used to evaluate HCl emissions for Portland Cement facilities, electric generating units, and industrial, commercial, and institutional boilers and process heaters.

BACKGROUND 

• On July 7, 2015, the EPA published Procedure 6, which is a companion to Performance Specification 18. 
• After publication, certain minor data treatment inconsistencies were identified.
• The EPA proposed to correct the minor inconsistencies in Performance Specification 18 and Procedure 6 through a direct final action titled, “Technical Amendments to Performance Specification 18 and Procedure 6.” 81 Fed. Reg. 31,515 (May 19, 2016). One substantive comment was received regarding changes to Procedure 6. 
• The EPA is responding to that comment and finalizing corrections to Procedure 6 with this action.

FEDERAL REGISTER

Technical Amendments to Procedure 6- Federal Register

• Fact Sheet - Technical Amendments to Procedure 6 (PDF)(1 pg, 405 K, 9/19/2017)