---
kind: "section"
citation: "40 C.F.R. § 63.687"
title: "40"
number: "63.687"
heading: "Standards: Surface impoundments."
url: "https://uscodex.org/cfr/40/63.687"
---

# §63.687. Standards: Surface impoundments.

- (a) The provisions of this section apply to the control of air emissions from surface impoundments for which [§ 63.683(b)(1)(i)](/cfr/40/63.683.md?p=b-1-i) of this subpart references the use of this section for such air emission control.
- (b) The owner or operator shall control air emissions from each surface impoundment subject to this section by using one of the following:
  - (1) A floating membrane cover in accordance with the applicable provisions specified in [subpart QQ](/cfr/40/subpartQQ.md) of this part—National Emission Standards for Surface Impoundments, except that §§ [63.942(c)(2)](/cfr/40/63.942.md?p=c-2) and [(3)](/cfr/40/63.942.md?p=c-3) and [63.943(c)(2)](/cfr/40/63.943.md?p=c-2) shall not apply for the purposes of this subpart; or
  - (2) A cover that is vented through a closed-vent system to a control device in accordance with all applicable provisions specified in [subpart QQ](/cfr/40/subpartQQ.md) of this part—National Emission Standards for Surface Impoundments, except that §§ [63.942(c)(2)](/cfr/40/63.942.md?p=c-2) and [(3)](/cfr/40/63.942.md?p=c-3) and [63.943(c)(2)](/cfr/40/63.943.md?p=c-2) shall not apply for the purposes of this subpart.

## Notes

### Amendments

[61 FR 34158, July 1, 1996, as amended at 64 FR 38969, July 20, 1999; 80 FR 14274, Mar. 18, 2015]

### Source

Source: 61 FR 34158, July 1, 1996, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[61 FR 34158, July 1, 1996, as amended at 64 FR 38969, July 20, 1999; 80 FR 14274, Mar. 18, 2015]