---
kind: "section"
citation: "40 C.F.R. § 63.8184"
title: "40"
number: "63.8184"
heading: "What parts of my plant does this subpart cover?"
url: "https://uscodex.org/cfr/40/63.8184"
---

# §63.8184. What parts of my plant does this subpart cover?

- (a) This subpart applies to each affected source at a plant site where chlorine and caustic are produced in mercury cells. This subpart applies to two types of affected sources: the mercury cell chlor-alkali production facility, as defined in [paragraph (a)(1)](#a-1) of this section; and the mercury recovery facility, as defined in [paragraph (a)(2)](#a-2) of this section.
  - (1) The mercury cell chlor-alkali production facility designates an affected source consisting of all cell rooms and ancillary operations used in the manufacture of product chlorine, product caustic, and by-product hydrogen at a plant site. This subpart covers mercury emissions from by-product hydrogen streams and end box ventilation system vents, mercury fugitive emissions associated with cell rooms, hydrogen systems, caustic systems, and storage areas for mercury-containing wastes; and chlorine fugitive emissions associated with the mercury cell chlor-alkali production facility.
  - (2) The mercury recovery facility designates an affected source consisting of all processes and associated operations needed for mercury recovery from wastes at a plant site. This subpart covers mercury emissions from mercury thermal recovery unit vents and fugitive emission sources of mercury associated with storage areas for mercury-containing wastes.
- (b) An affected source at your mercury cell chlor-alkali plant is existing if you commenced construction of the affected source before July 3, 2002.
- (c) A mercury recovery facility is a new affected source if you commence construction or reconstruction of the affected source after July 3, 2002. An affected source is reconstructed if it meets the definition of “reconstruction” in [§ 63.2](/cfr/40/63.2.md).

## Notes

### Amendments

[68 FR 70928, Dec. 19, 2003, as amended at 87 FR 27018, May 6, 2022]

### Source

Source: 68 FR 70928, Dec. 19, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[68 FR 70928, Dec. 19, 2003, as amended at 87 FR 27018, May 6, 2022]