{"data":{"id":"us/40-cfr-63.7940","jurisdiction":"us","citation":"40 CFR 63.7940","heading":"By what date must I conduct performance tests or other initial compliance demonstrations?","body":"(a) You must conduct a performance test or design evaluation for each existing affected source within 180 calendar days after the compliance date that is specified in § 63.7883.\n(b) For each work practice standard that applies to you where initial compliance is not demonstrated using a performance test or design evaluation, you must demonstrate initial compliance within 30 calendar days after the compliance date that is specified in § 63.7883 for your affected source.\n(c) For new sources, you must conduct initial performance tests and other initial compliance demonstrations according to the provisions in § 63.7(a)(2).","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 GGGGG—National Emission Standards for Hazardous Air Pollutants: Site Remediation"],"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":"781f7d62734716be52827bc7cae5d601fd67c46c3bbac460614974f2df676fc4","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.7938","next":"us/40-cfr-63.7941"},"notice":"GroundRules: Original legal text. Not legal advice."}