{"data":{"id":"us/40-cfr-421.34","jurisdiction":"us","citation":"40 CFR 421.34","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 C—Scrap Drying 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 aluminum scrap dried\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times\n(b) Subpart C—Scrap Screening and Milling.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum scrap screened and milled\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(c) Subpart C—Dross Washing.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of dross washed\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(d) Subpart C—Demagging Wet Air Pollution Control.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (lb/million lbs) of aluminum demagged\nLead 0.216 0.100\nZinc 0.786 0.324\nAluminum 4.711 2.090\nAmmonia (as N) 102.800 45.180\nTotal suspended solids 11.570 9.252\nOil and grease 7.710 7.710\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(e) Subpart C—Delacquering 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 aluminum delacquered\nLead 0.093 0.043\nZinc 0.340 0.140\nAluminum 2.035 0.903\nAmmonia (as N) 44.389 19.514\nTotal phenolics (4-AAP method) 1 0.004\nTotal suspended solids 4.995 3.996\nOil and grease 3.330 3.330\npH (2) (2)\n1 At the source.\n2 Within the range of 7.0 to 10.0 at all times.\n(f) Subpart C—Direct Chill Casting Contact Cooling.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .372 .173\nZinc 1.356 .558\nAluminum 8.120 3.602\nAmmonia (as N) 177.200 77.880\nTotal suspended solids 19.940 15.950\nOil and grease 13.290 13.290\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(g) Subpart C—Ingot Conveyor Casting Contact Cooling (When Chlorine Demagging Wet Air Pollution Control is Not Practiced On-Site).\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (lb/million lbs) of aluminum cast\nLead 0.019 0.009\nZinc 0.068 0.028\nAluminum 0.409 0.182\nAmmonia (as N) 8.931 3.926\nTotal suspended solids 1.005 0.804\nOil and grease 0.670 0.670\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(h) Subpart C—Ingot Conveyor Casting Contact Cooling (When Chlorine Demagging Wet Air Pollution Control is Practiced On Site).\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(i) Subpart C—Stationary Casting Contact Cooling.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(j) Subpart C—Shot Casting Contact Cooling.\nNSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\nOil and grease .000 .000\npH (1) (1)\n1 Within the range of 7.0 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 C—Secondary Aluminum Smelting 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":"b125cfe243366db1466268c7f3d200d1fefd933287a760df729950b88d0dc28b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.33","next":"us/40-cfr-421.35"},"notice":"GroundRules: Original legal text. Not legal advice."}