{"data":{"id":"us/40-cfr-421.234","jurisdiction":"us","citation":"40 CFR 421.234","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) Raw Material Dust Control.\nNSPS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of copper, nickel, and cobalt in the crushed raw material\nCopper 0.099 0.047\nNickel 0.042 0.028\nAmmonia (as N) 10.260 4.512\nCobalt 0.011 0.005\nTotal suspended solids 1.155 0.924\npH 1 1\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Nickel wash water.\nNSPS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of nickel powder washed\nCopper 0.043 0.021\nNickel 0.019 0.013\nAmmonia (as N) 4.515 1.985\nCobalt 0.005 0.002\nTotal suspended solids 0.508 0.406\npH 1 1\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Nickel reduction decant.\nNSPS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of nickel produced\nCopper 16.250 7.744\nNickel 6.982 4.697\nAmmonia (as N) 1,692.000 743.900\nCobalt 1.777 0.889\nTotal suspended solids 190.400 152.300\npH 1 1\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Cobalt reduction decant.\nNSPS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cobalt produced\nCopper 27.390 13.050\nNickel 11.770 7.917\nAmmonia (as N) 2,852.000 1,254.000\nCobalt 2.996 1.498\nTotal suspended solids 321.000 256.800\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 U—Primary Nickel and Cobalt 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":"617aa266ad4f3016b7cec84d2011ea435be24266d632c868c1b27b9d1475b1c9","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.233","next":"us/40-cfr-421.235"},"notice":"GroundRules: Original legal text. Not legal advice."}