{"data":{"id":"us/40-cfr-61.176","jurisdiction":"us","citation":"40 CFR 61.176","heading":"Recordkeeping requirements.","body":"(a) Each owner or operator subject to the requirements of § 61.172(b)(1) shall maintain at the source for a period of at least 2 years records of the visual inspections, maintenance, and repairs performed on each secondary hood system as required in § 61.172(b)(3).\n(b) Each owner or operator subject to the provisions of § 61.172(c) shall maintain at the source for a period of at least 2 years and make available to the Administrator upon request a file of the following records:\n(1) All measurements, including continuous monitoring for measurement of opacity;\n(2) Records of emission test data and all calculations used to produce the required reports of emission estimates to demonstrate complaince with § 61.172(c);\n(3) All continuous monitoring system performance evaluations, including calibration checks and adjustments;\n(4) The occurrence and duration of all startups, shutdowns, and malfunctions of the copper converters;\n(5) All malfunctions of the air pollution control system;\n(6) All periods during which any continuous monitoring system or device is inoperative;\n(7) All maintenance and repairs performed on each air pollution control system, continuous monitoring system, or monitoring device;\n(8) All records of 1-hour average opacity levels for each separate control device; and\n(9) For each secondary hood system:\n(i) The reference flow rates for the horizontal-slotted plenum and exhaust hood for each converter operating mode estabilshed under § 61.175(g);\n(ii) The actual flow rates; and\n(iii) A daily log of the start time and duration of each converter operating mode.\n(c) Each owner or operator subject to the provisions of this subpart shall maintain at the source for a period of at least 2 years and make available to the Administrator upon request the following records:\n(1) For each copper converter, a daily record of the amount of copper matte and lead matte charged to the copper converter and the total hours of operation.\n(2) For each copper converter department, a monthly record of the weight percent of arsenic contained in the copper matte and lead matte as determined under § 61.174(f).\n(3) For each copper converter department, the monthly calculations of the average annual arsenic charging rate for the preceding 12-month period as determined under § 61.174(f).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 61—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS","Subpart O—National Emission Standard for Inorganic Arsenic Emissions From Primary Copper Smelters"],"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":"78b3037ec1c221300dcf986fd5518394e669c2941b9ca38aaccb06cbe82b8e4a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-61.175","next":"us/40-cfr-61.177"},"notice":"GroundRules: Original legal text. Not legal advice."}