---
kind: "section"
citation: "40 C.F.R. § 413.81"
title: "40"
number: "413.81"
heading: "Specialized definitions."
url: "https://uscodex.org/cfr/40/413.81"
---

# §413.81. Specialized definitions.


For the purpose of this subpart:

- (a) The term sq ft (“sq m”) shall mean the area of the printed circuit board immersed in an aqueous process bath.
- (b) The term operation shall mean any step in the printed circuit board manufacturing process in which the board is immersed in an aqueous process bath which 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.