{"data":{"id":"us/40-cfr-434.53","jurisdiction":"us","citation":"40 CFR 434.53","heading":"Effluent limitations guidelines representing the degree of effluent reduction attainable by application of the best available technology economically achievable (BAT).","body":"(a) Reclamation areas. The limitations of this subsection apply to discharges from reclamation areas until SMCRA bond release.\nExcept as provided in 40 CFR 125.30-125.32, and §§ 434.61 and 434.63(d)(2) of this part, the following limitations establish the concentration or quality of pollutants which may be discharged by a point source subject to the provisions of this subsection after application of the best available technology economically achievable:\nBAT Effluent Limitations\nPollutant or pollutant property Limitations\nSettleable solids 0.5 ml/l maximum not to be exceeded.\n(b) Underground mine drainage. The limitations in this subsection apply to discharges from the underground workings of underground mines until SMCRA bond release.\n(1) Except as provided in 40 CFR 125.30-125.32, and §§ 434.61, 434.62, and 434.63 of this part, the following limitations establish the concentration or quality of pollutants in acid or ferruginous mine drainage subject to the provisions of this subsection after application of the best available technology economically achievable:\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Average of daily values for 30 consecutive days\nConcentration in mg/l\nIron, total 7.0 3.5\nManganese, total 4.0 2.0\n(2) Except as provided in 40 CFR 125.30-125.32, and §§ 434.61, and 434.63 of this part, the following limitations establish the concentration or quality of pollutants in alkaline mine drainage subject to the provisions of this subsection after application of the best available technology economically achievable:\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Average of daily values for 30 consecutive days\nConcentration in mg/l\nIron, total 7.0 3.5","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 434—COAL MINING POINT SOURCE CATEGORY BPT, BAT, BCT LIMITATIONS AND NEW SOURCE PERFORMANCE STANDARDS","Subpart E—Post-Mining Areas"],"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":"c6450a78fa6419b194d7e9d625ed42fd4c6458c4a254f6ee9ef1f6ead69e29d2","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-434.52","next":"us/40-cfr-434.54"},"notice":"GroundRules: Original legal text. Not legal advice."}