Performance Specification 18-Performance Specifications and Test Procedures for Hydrogen Chloride Continuous Emission Monitoring Systems at Stationary Sources

The Environmental Protection Agency (EPA) is finalizing performance specifications and test procedures for hydrogen chloride (HCl) continuous emission monitoring systems (CEMS) to provide sources and regulatory agencies with criteria and test procedures for evaluating the acceptability of HCl CEMS. The final performance specification (Performance Specification 18) includes requirements for initial acceptance, including instrument accuracy and stability assessments. This action also finalizes quality assurance (QA) procedures for HCl CEMS used for compliance determination at stationary sources. The QA procedures (Procedure 6) specify the minimum QA requirements necessary for the control and assessment of the quality of CEMS data submitted to the EPA. This action establishes consistent requirements for ensuring and assessing the quality of HCl data measured by CEMS. The affected systems are those used for determining compliance with emission standards for HCl on a continuous basis as specified in an applicable permit or regulation. The affected industries and their North American Industry Classification System (NAICS) codes are listed in the SUPPLEMENTARY INFORMATION section of this preamble.