{"data":{"id":"us/40-cfr-table-4-to-subpart-aa-of-part-63","jurisdiction":"us","citation":"40 CFR Table 4 to Subpart AA of Part 63","heading":"Table 4 to Subpart AA of Part 63—Operating Parameters, Operating Limits and Data Monitoring, Recordkeeping and Compliance Frequencies","body":"For the operating parameter applicable to you, as specified in Table 3 . . . You must establish the following operating limit . . . And you must monitor, record, and demonstrate continuous compliance using these minimum frequencies . . .\nData measurement Data recording Data averaging period for compliance\nAbsorbers (Wet Scrubbers)\nInfluent liquid flow Minimum inlet liquid flow Continuous Every 15 minutes Daily.\nInfluent liquid flow rate and gas stream flow rate Minimum influent liquid-to-gas ratio a Continuous Every 15 minutes Daily.\nPressure drop Pressure drop range Continuous Every 15 minutes Daily.\nSorbent Injection\nSorbent injection rate Minimum injection rate Continuous Every 15 minutes Daily.\nSorbent injection carrier gas flow rate Minimum carrier gas flow rate Continuous Every 15 minutes Daily.\nFabric Filters\nAlarm time Maximum alarm time is not established on a site-specific basis but is specified in § 63.605(f)(9) Continuous Each date and time of alarm start and stop Maximum alarm time specified in § 63.605(f)(9).\nWet Electrostatic Precipitator\nSecondary voltage Secondary voltage range Continuous Every 15 minutes Daily.\na If you select the regression model option to monitor influent liquid-to-gas ratio as described in Table 3 to this subpart, then you must also continuously monitor (i.e., record every 15 minutes, and use a daily averaging period) blower amperage, blower static pressure (i.e., fan suction pressure), and any other parameters used in the regression model that are not constants.","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 AA—National Emission Standards for Hazardous Air Pollutants from Phosphoric Acid Manufacturing Plants"],"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":"d0670c5f60cfc4150f835424026daf41b2ee2cfda8f98f3fc0eb7420c18a432b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-3-to-subpart-aa-of-part-63","next":"us/40-cfr-table-5-to-subpart-aa-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}