---
kind: "section"
citation: "40 C.F.R. § 413.51"
title: "40"
number: "413.51"
heading: "Specialized definitions."
url: "https://uscodex.org/cfr/40/413.51"
---

# §413.51. Specialized definitions.


For the purpose of this subpart;

- (a) The term sq m (“sq ft”) shall mean the area processed expressed in square meters (square feet).
- (b) The term operation shall mean any step in the coating process in which a basis material surface is acted upon by a process solution and which is followed by a rinse; plus the related operations of alkaline cleaning, acid pickle, and sealing, when each operation is followed by a rinse.

## Notes

### Authority

Authority: Secs. 301, 304(g), 307, 308, 309, 402, 405, 501(a), Clean Water Act, as amended, (33 U.S.C. 1311, 1314(g), 1317, 1318, 1319, 1322, 1325 and 1341(a)).

### Source

Source: 46 FR 9467, Jan. 28, 1981, unless otherwise noted.