{"data":{"id":"us/40-cfr-421.114","jurisdiction":"us","citation":"40 CFR 421.114","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) Subpart K—Concentrate Digestion Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of concentrate digested\nLead .174 .081\nZinc .635 .261\nAmmonia (as N) 82.910 36.450\nFluoride 21.770 12.440\nTotal suspended solids 9.330 7.464\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Subpart K—Solvent Extraction Raffinate.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of concentrate digested\nLead 2.592 1.203\nZinc 9.442 3.888\nAmmonia (as N) 1,233.000 542.5000\nFluoride 324.000 185.100\nTotal Suspended Solids 138.900 111.100\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Subpart K—Solvent Extraction Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of concentrate digested\nLead .069 .032\nZinc .251 .103\nAmmonia (as N) 32.790 14.420\nFluoride 8.610 4.920\nTotal suspended solids 3.690 2.952\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Subpart K—Precipitation and Filtration.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of concentrate digested\nLead 3.833 1.780\nZinc 13.960 5.750\nAmmonia (as N) 1,825.000 802.200\nFluoride 479.100 273.800\nTotal suspended solids 205.400 164.300\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of concentrate digested\nLead 1.778 .826\nZinc 6.478 2.668\nAmmonia (as N) 846.600 372.200\nFluoride 222.300 127.000\nTotal suspended solids 95.270 76.210\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Subpart K—Tantalum Salt Drying.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tantalum salt dried\nLead 16.950 7.871\nZinc 61.750 25.430\nAmmonia (as N) 8,070.000 3,548.000\nFluoride 2,119.000 1,211.000\nTotal suspended solids 908.200 726.500\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Subpart K—Oxides Calcining Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of columbium-tantalum oxide dried\nLead 1.076 .500\nZinc 3.919 1.614\nAmmonia (as N) 512.200 225.200\nFluoride 134.500 76.840\nTotal suspended solids 57.630 46.110\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Subpart K—Reduction of Tantalum Salt to Metal.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tantalum salt reduced\nLead 46.500 21.590\nZinc 169.400 69.750\nAmmonia (as N) 22,140.000 9,732.000\nFluoride 5,813.000 3,322.000\nTotal suspended solids 2,491.000 1,993.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tantalum salt reduced\nLead .572 .266\nZinc 2.084 .858\nAmmonia (as N) 272.400 119.700\nFluoride 71.510 40.860\nTotal suspended solids 30.650 24.520\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(j) Subpart K—Tantalum Powder Wash.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tantalum powder washed\nLead 5.721 2.656\nZinc 20.840 8.582\nAmmonia (as N) 2,724.000 1,198.000\nFluoride 715.200 408.700\nTotal suspended solids 306.500 245.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(k) Subpart K—Consolidation and Casting Contact Cooling.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated\nLead .000 .000\nZinc .000 .000\nAmmonia (as N) .000 .000\nFluoride .000 .000\nTotal suspended solids .000 .000\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 K—Primary Columbium-Tantalum 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":"fb2ec6f408b62c8d1e3a82919ce8a3424051d7d0c2da51919490269641c6e8bc","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.113","next":"us/40-cfr-421.115"},"notice":"GroundRules: Original legal text. Not legal advice."}