Code of Federal Regulations > Title 40 > Chapter I > Part 65 > Subpart D > Appendix - Table 1 to Subpart D of Part 65

Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024

Appendix - Table 1 to Subpart D of Part 65—Concentration for Group Determination

Referencing subpart	Concentration ¹
Subpart III of Part 60	NA.
Subpart NNN of Part 60	300 ppmv of TOC.
Subpart RRR of Part 60	300 ppmv of TOC.
Subpart G of Part 63	50 ppmv of HAP ².

¹ The 50 ppm HAP concentration cutoff only applies to 40 CFR part 63, subpart G sources. Process vents subject to only 40 CFR part 60, subparts RRR or NNN are eligible for the 300 ppm TOC cutoff. There is no concentration cutoff for subpart III sources. The process vent provisions of subpart DDD are not consolidated under this subpart.

² For process vents subject to subpart G of 40 CFR part 63, the owner or operator may measure HAP or TOC concentration with regard to the low concentration exemption provisions of this part.

authority: 42 U.S.C. 7401

source: 65 FR 78285, Dec. 14, 2000, unless otherwise noted.