Code of Federal Regulations > Title 40 > Chapter I > Part 65 > Subpart A > Appendix - Table 3 to Subpart A of Part 65—Detection Sensitivity Levels (grams per hour)

Regulations last checked for updates: May 01, 2025

Title 40 - Protection of Environment last revised: Nov 01, 2025

Appendix - Table 3 to Subpart A of Part 65—Detection Sensitivity Levels (grams per hour)

Monitoring Frequency per Subpart ^a	Detection Sensitivity Level
Bi-Monthly	60
Semi-Quarterly	85
Monthly	100

^a When this alternative work practice is used to identify leaking equipment, the owner or operator must choose one of the monitoring frequencies listed in this table, in lieu of the monitoring frequency specified in the applicable subpart. Bi-monthly means every other month. Semi-quarterly means twice per quarter. Monthly means once per month.

[73 FR 78219, Dec. 22, 2008]

authority: 42 U.S.C. 7401

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