---
kind: "section"
citation: "40 C.F.R. § 57.503"
title: "40"
number: "57.503"
heading: "Control measures."
url: "https://uscodex.org/cfr/40/57.503"
---

# §57.503. Control measures.


The NSO of any smelter subject to the requirements of [§ 57.502(b)](/cfr/40/57.502.md?p=b) shall be amended, if necessary, within 6 months of EPA's receipt of the analysis specified in [§ 57.502(b)](/cfr/40/57.502.md?p=b), as provided in [§ 57.704(c)](/cfr/40/57.704.md?p=c) to implement the requirement of [§ 57.501](/cfr/40/57.501.md). Measures required to be implemented may include:

- (a) **Additional supplementary control.** The use of the supplementary control system, if the additional use of the system does not interfere with the smelter owner's ability to meet the requirements of subpart D; and
- (b) **Engineering and maintenance techniques.** The use of engineering and maintenance techniques to detect and prevent leaks and capture and vent fugitive emissions through appropriate stacks. These techniques include but are not limited to:
  - (1) For reactors, installation and proper operation of primary hoods;
  - (2) For roasters, installation and proper operation of primary hoods on all hot calcine transfer points;
  - (3) For furnaces, installation and proper operation of primary hoods on all active matte tap holes, matte launders, slag skim bays, and transfer points;
  - (4) For converters, installation and proper operation of primary hoods for blowing operations, and where appropriate, secondary hoods for charging and pouring operations;
  - (5) For sintering machines, installation and proper operation of primary hoods on the sinter bed, all hot sinter ignition points, all concentrate laydown points, and all hot sinter transfer points;
  - (6) For blast furnaces, installation and proper operation of primary hoods on all active slag and lead bullion furnace tap holes and transfer points;
  - (7) For dross reverberatory furnaces, installation and proper operation of primary hoods on all active charging and discharging points;
  - (8) Maintenance of all ducts, flues and stacks in a leak-free condition to the maximum extent possible;
  - (9) Maintenance of all process equipment under normal operating conditions in such a fashion that out-leakage of fugitive gases will be prevented to the maximum extent possible;
  - (10) Secondary or tertiary hooding on process equipment where necessary; and
  - (11) **Partial or complete building evacuation as appropriate.**

## Notes

### Authority

Authority: Secs. 110, 114, 119, 301, Clean Air Act, as amended (42 U.S.C. 7410, 7414, 7419, and 7601); sec. 406 of Pub. L. 95-95.

### Source

Source: 50 FR 6448, Feb. 15, 1985, unless otherwise noted.