{"data":{"id":"us/40-cfr-421.274","jurisdiction":"us","citation":"40 CFR 421.274","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) Dryer Vent Water Quench and Scrubber.\nNSPS for the Primary Rare Earth Metals Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides\nHexachlorobenzene 0.042 0.042\nChromium (total) 1.544 0.626\nLead 1.168 0.542\nNickel 2.295 1.544\nTotal suspended solids 62.600 50.080\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Dryer vent caustic wet air pollution control.\nNSPS for the Primary Rare Earth Metals Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides\nHexachlorobenzene 0.007 0.007\nChromium (total) 0.272 0.110\nLead 0.206 0.095\nNickel 0.404 0.272\nTotal suspended solids 11.010 8.808\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Electrolytic cell water quench and scrubber.\nNSPS for the Primary Rare Earth Metals Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of total mischmetal produced\nHexachlorobenzene 0.094 0.094\nChromium (total) 3.474 1.409\nLead 2.629 1.221\nNickel 5.165 3.474\nTotal suspended solids 140.900 112.700\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Electrolytic cell caustic wet air pollution control.\nNSPS for the Primary Rare Earth Metals Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of total mischmetal produced\nHexachlorobenzene 0.000 0.000\nChromium (total) 0.000 0.000\nLead 0.000 0.000\nNickel 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) Sodium hypochlorite filter backwash.\nNSPS for the Primary Rare Earth Metals Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of total mischmetal produced\nHexachlorobenzene 0.004 0.004\nChromium (total) 0.134 0.054\nLead 0.101 0.047\nNickel 0.199 0.134\nTotal suspended solids 5.430 4.334\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 Y—Primary Rare Earth Metals 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":"55f17512899e9a485411cafb9b5249b843c26d0bded9a4224cef4aad590e36f5","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.272-421.273","next":"us/40-cfr-421.275"},"notice":"GroundRules: Original legal text. Not legal advice."}