[Code of Federal Regulations]
[Title 40, Volume 5]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR57.301]

[Page 139-140]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 57--PRIMARY NONFERROUS SMELTER ORDERS--Table of Contents
 
          Subpart C--Constant Controls and Related Requirements
 
Sec. 57.301  General requirements.


    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 Sec. 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
    (d) In all primary nonferrous smelters, all other strong 
SO2 streams.
    (e) In all primary nonferrous smelters, any other process streams 
which

[[Page 140]]

were regularly or intermittently treated by constant controls at the 
smelter as of August 7, 1977.