{"data":{"id":"us/40-cfr-421.294","jurisdiction":"us","citation":"40 CFR 421.294","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) Tin smelter SO2 scrubber.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of crude tapped tin produced\nArsenic 12.790 5.703\nLead 2.575 1.196\nIron 11.040 5.611\nTin 3.495 2.024\nTotal suspended solids 138.000 110.400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Dealuminizing rinse.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of dealuminized scrap produced\nLead 0.010 0.005\nCyanide (total) 0.007 0.003\nFluoride 1.225 0.697\nTin 0.013 0.008\nTotal suspended solids 0.525 0.420\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Tin mud acid neutralization filtrate.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of neutralized dewatered tin mud produced\nLead 1.413 0.656\nCyanide (total) 1.009 0.404\nFluoride 176.600 100.400\nTin 1.918 1.110\nTotal suspended solids 75.710 60.560\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Tin hydroxide wash.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin hydroxide washed\nLead 3.347 1.554\nCyanide (total) 2.391 0.956\nFluoride 418.400 237.900\nTin 4.542 2.630\nTotal suspended solids 179.300 143.400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Spent electrowinning solution from new scrap.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cathode tin produced\nLead 4.704 2.184\nCyanide (total) 3.360 1.344\nFluoride 588.000 334.300\nTin 6.384 3.696\nTotal suspended solids 252.000 201.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Spent electrowinning solution from municipal solid waste.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of MSW scrap used as raw material\nLead 0.033 0.015\nCyanide (total) 0.024 0.010\nFluoride 4.165 2.368\nTin 0.045 0.026\nTotal suspended solids 1.785 1.428\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Tin hydroxide supernatant from scrap.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal recovered from scrap\nLead 15.580 7.233\nCyanide (total) 11.130 4.451\nFluoride 1,947.000 1,107.000\nTin 21.140 12.240\nTotal suspended solids 834.600 667.700\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Tin hydroxide supernatant from plating solutions and sludges.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal recovered from plating solutions and sludges\nLead 32.20 14.95\nCyanide (total) 23.00 9.20\nFluoride 4,025.00 2,289.00\nTin 43.70 25.30\nTotal suspended solids 1,725.00 1,380.00\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(i) Tin hydroxide filtrate.\nNSPS for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal produced\nLead 7.012 3.256\nCyanide (total) 5.009 2.004\nFluoride 876.500 498.400\nTin 9.517 5.510\nTotal suspended solids 375.700 300.500\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 AA—Secondary Tin 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":"17acab95b10f5843ce3a7a633661e23f11da7e31aeb912659909c7972f865fc6","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.293","next":"us/40-cfr-421.295"},"notice":"GroundRules: Original legal text. Not legal advice."}