{"data":{"id":"us/40-cfr-63.8440","jurisdiction":"us","citation":"40 CFR 63.8440","heading":"When must I conduct subsequent performance tests?","body":"(a) For each affected kiln that is subject to the emission limits specified in Table 1 to this subpart, you must conduct a performance test before renewing your 40 CFR part 70 operating permit or at least every 5 years following the initial performance test.\n(b) You must conduct a performance test when you want to change the parameter value for any operating limit specified in your OM\u0026M plan.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart JJJJJ—National Emission Standards for Hazardous Air Pollutants for Brick and Structural Clay Products Manufacturing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"3d28e8f7a95e5e4fc9e2f339e43bc3b8c9ade721a410ed164e458ca8ddb6dc2c","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.8435","next":"us/40-cfr-63.8445"},"notice":"GroundRules: Original legal text. Not legal advice."}