---
kind: "section"
citation: "40 C.F.R. § 63.105"
title: "40"
number: "63.105"
heading: "Maintenance wastewater requirements."
url: "https://uscodex.org/cfr/40/63.105"
---

# §63.105. Maintenance wastewater requirements.

- (a) Each owner or operator of a source subject to this subpart shall comply with the requirements of [paragraphs (b) through (e)](#b..e) of this section for maintenance wastewaters containing those organic HAP's listed in table 9 of [subpart G](/cfr/40/subpartG.md) of this part.
- (b) The owner or operator shall prepare a description of maintenance procedures for management of wastewaters generated from the emptying and purging of equipment in the process during temporary shutdowns for inspections, maintenance, and repair (i.e., a maintenance-turnaround) and during periods which are not shutdowns (i.e., routine maintenance). The descriptions shall:
  - (1) Specify the process equipment or maintenance tasks that are anticipated to create wastewater during maintenance activities.
  - (2) Specify the procedures that will be followed to properly manage the wastewater and control organic HAP emissions to the atmosphere; and
  - (3) **Specify the procedures to be followed when clearing materials from process equipment.**
- (c) The owner or operator shall modify and update the information required by [paragraph (b)](#b) of this section as needed following each maintenance procedure based on the actions taken and the wastewaters generated in the preceding maintenance procedure.
- (d) The owner or operator shall incorporate the procedures described in paragraphs [(b)](#b) and [(c)](#c) of this section as part of the startup, shutdown, and malfunction plan required under [§ 63.6(e)(3)](/cfr/40/63.6.md?p=e-3). For each source as defined in [§ 63.101](/cfr/40/63.101.md), on and after July 15, 2027, this paragraph no longer applies.
- (e) The owner or operator shall maintain a record of the information required by paragraphs [(b)](#b) and [(c)](#c) of this section as part of the start-up, shutdown, and malfunction plan required under [§ 63.6(e)(3)](/cfr/40/63.6.md?p=e-3). For each source as defined in [§ 63.101](/cfr/40/63.101.md), on and after July 15, 2027, the phrase “as part of the start-up, shutdown, and malfunction plan required under [§ 63.6(e)(3)](/cfr/40/63.6.md?p=e-3)” in this paragraph no longer applies.

## Notes

### Amendments

[59 FR 19454, Apr. 22, 1994, as amended at 60 FR 63626, Dec. 12, 1995; 71 FR 20456, Apr. 20, 2006; 89 FR 43169, May 16, 2024]

### Source

Source: 59 FR 19454, Apr. 22, 1994, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[59 FR 19454, Apr. 22, 1994, as amended at 60 FR 63626, Dec. 12, 1995; 71 FR 20456, Apr. 20, 2006; 89 FR 43169, May 16, 2024]