CFR › Title 40 › Part 421 › §421.23440 CFR §421.234Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkAny new source subject to this subpart shall achieve the following new source performance standards:(a)Raw Material Dust Control.(b)Nickel wash water.(c)Nickel reduction decant.(d)Cobalt reduction decant.