40 CFR 57.301 - General requirements.
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Each NSO shall require an interim level of sulfur dioxide constant controls to be operated at the smelter, unless a waiver of this requirement has been granted to the owner under subpart H of this part. Except as otherwise provided in § 57.304, the interim constant controls shall be properly operated and maintained at all times. The NSO shall require the following gas streams to be treated by interim constant controls:
(a) In copper smelters, off-gases from fluidized bed roasters, flash furnaces, NORANDA reactors, electric furnaces and copper converters;
(b) In lead smelters, off-gases from the front end of the sintering machine and any other sinter gases which are recirculated;
(c) In zinc smelters, off-gases from mult-hearth roasters, flash roasters and fluidized bed roasters; and
Title 40 published on 2014-07-01
no entries appear in the Federal Register after this date.