---
kind: "section"
citation: "40 C.F.R. § 751.703"
title: "40"
number: "751.703"
heading: "Definitions."
url: "https://uscodex.org/cfr/40/751.703"
---

# §751.703. Definitions.


The definitions in subpart A of this part apply to this Subpart unless otherwise specified in this section. In addition, the following definitions apply:

ECEL has the same meaning as in [§ 751.5](/cfr/40/751.5.md) and for CTC, is an airborne concentration of carbon tetrachloride of 0.03 parts per million (ppm) calculated as an eight (8)-hour time-weighted average (TWA).

ECEL action level means a concentration of airborne carbon tetrachloride of 0.02 parts per million (ppm) calculated as an eight (8)-hour time-weighted average (TWA).


## Notes

### Source

Source: 89 FR 103551, Dec. 18, 2024, unless otherwise noted.

### Authority

Authority: 15 U.S.C. 2605, 15 U.S.C. 2625(l)(4).

### Source

Source: 84 FR 11435, Mar. 27, 2019, unless otherwise noted.