40 CFR § 751.703 - Definitions.

---
identifier: "/us/cfr/t40/s751.703"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 751.703 - Definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "751.703"
section_name: "Definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "751"
part_name: "REGULATION OF CERTAIN CHEMICAL SUBSTANCES AND MIXTURES UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2605, 15 U.S.C. 2625(l)(4)."
regulatory_source: "84 FR 11435, Mar. 27, 2019, unless otherwise noted."
cfr_part: "751"
---


# 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 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).