Regulations last checked for updates: Feb 24, 2025

Title 40 - Protection of Environment last revised: Nov 24, 2025
Appendix - Table 2 to Subpart OOOOc of Part 60—Alternative Technology Periodic Screening Frequency at Well Sites, Centralized Production Facilities, and Compressor Stations Subject to AVO Inspections With Quarterly OGI or EPA Method 21 Monitoring
Minimum screening frequency Minimum detection threshold
of screening technology *
(kg/hr)
Quarterly≤1
Bimonthly≤2
Bimonthly + Annual OGI≤10
Monthly≤5
Monthly + Annual OGI≤15

* Based on a probability of detection of 90%.

authority: 42 U.S.C. 7401
source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.