{"data":{"id":"us/40-cfr-421.224","jurisdiction":"us","citation":"40 CFR 421.224","heading":"Standards of performance for new sources.","body":"Any new source subject to this subpart shall achieve the following new source performance standards:\n(a) Leach tailings.\nNSPS for the Secondary Molybdenum and Vanadium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of technical grade molybdenum plus vanadium plus pure grade molybdenum produced\nArsenic 27.120 12.097\nChromium 7.219 2.927\nLead 5.463 2.536\nNickel 10.731 7.219\nIron 23.413 11.902\nMolybdenum [Reserved] [Reserved]\nAmmonia (as N) 8078.000 3551.000\nTotal Suspended Solids 292.665 234.132\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Molybdenum filtrate solvent extraction raffinate.\nNSPS for the Secondary Molybdenum and Vanadium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of technical grade molybdenum plus vanadium plus pure grade molybdenum produced\nArsenic 80.952 36.108\nChromium 21.548 8.736\nLead 16.306 7.571\nNickel 32.031 21.548\nIron 69.887 35.526\nMolybdenum [Reserved] [Reserved]\nAmmonia (as N) 24114.000 10600.000\nTotal Suspended Solids 873.585 698.868\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Vanadium decomposition wet air pollution control.\nNSPS for the Secondary Molybdenum and Vanadium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of molybdenum and vanadium produced\nArsenic 0.000 0.000\nChromium 0.000 0.000\nLead 0.000 0.000\nNickel 0.000 0.000\nIron 0.000 0.000\nMolybdenum 0.000 0.000\nAmmonia (as N) 0.000 0.000\nTotal suspended solids 0.000 0.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Molybdenum drying wet air pollution control.\nNSPS for the Secondary Molybdenum and Vanadium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of molybdenum and vanadium produced\nArsenic 0.000 0.000\nChromium 0.000 0.000\nLead 0.000 0.000\nNickel 0.000 0.000\nIron 0.000 0.000\nMolybdenum 0.000 0.000\nAmmonia (as N) 0.000 0.000\nTotal suspended solids 0.000 0.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Pure Grade Molybdenum.\nNSPS for the Secondary Molybdenum and Vanadium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of pure molybdenum produced\nArsenic 32.359 14.434\nChromium 8.614 3.492\nLead 6.518 3.026\nNickel 12.804 8.614\nIron 27.936 14.201\nMolybdenum [Reserved] [Reserved]\nAmmonia (as N) 9638.000 4237.000\nTotal Suspended Solids 349.200 279.360\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY","Subpart T—Secondary Molybdenum and Vanadium Subcategory"],"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":"27a0eedfbe15056c6500fe3bedeb0df237f357f9efb8cb69499ad72b1f173266","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.223","next":"us/40-cfr-421.225"},"notice":"GroundRules: Original legal text. Not legal advice."}