{"data":{"id":"us/40-cfr-503.46","jurisdiction":"us","citation":"40 CFR 503.46","heading":"Frequency of monitoring.","body":"(a) Sewage sludge. (1) The frequency of monitoring for beryllium shall be as required in subpart C of 40 CFR part 61, and for mercury as required in subpart E of 40 CFR part 61.\n(2) The frequency of monitoring for arsenic, cadmium, chromium, lead, and nickel in sewage sludge fed to a sewage sludge incinerator shall be the frequency in Table 1 of § 503.46.\nTable 1 of § 503.46—Frequency of Monitoring—Incineration\nAmount of sewage sludge 1 (metric tons per 365 day period) Frequency\nGreater than zero but less than 290 Once per year.\nEqual to or greater than 290 but less than 1,500 Once per quarter (four times per year).\nEqual to or greater than 1,500 but less than 15,000 Once per 60 days (six times per year).\nEqual to or greater than 15,000 Once per month (12 times per year).\n1 Amount of sewage sludge fired in a sewage sludge incinerator (dry weight basis).\n(3) After the sewage sludge has been monitored for two years at the frequency in Table 1 of § 503.46, the permitting authority may reduce the frequency of monitoring for arsenic, cadmium, chromium, lead, and nickel.\n(b) Total hydrocarbons, oxygen concentration, information to determine moisture content, and combustion temperatures. The total hydrocarbons concentration and oxygen concentration in the exit gas from a sewage sludge incinerator stack, the information used to measure moisture content in the exit gas, and the combustion temperatures for the sewage sludge incinerator shall be monitored continuously.\n(c) Air pollution control device operating parameters. For sewage sludge incinerators subject to the requirements in subpart O of 40 CFR part 60, the frequency of monitoring for the appropriate air pollution control device operating parameters shall be the frequency of monitoring in subpart O of 40 CFR part 60. For all other sewage sludge incinerators, the appropriate air pollution control device operating parameters shall be at least daily.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER O—SEWAGE SLUDGE","PART 503—STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE","Subpart E—Incineration"],"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":"dea56bb7433136ece5dd3cb941d7d4b40ec5788b40d4767532baca9b3defef7a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-503.45","next":"us/40-cfr-503.47"},"notice":"GroundRules: Original legal text. Not legal advice."}