40 CFR Part 63, Table 1
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Operating time(% of year) | Equivalent continuous process monitoring frequency time in use |
|---|---|
| Monthly | Quarterly | Semiannually |
| 0 to <25% | Quarterly | Annually | Annually. |
| 25 to <50% | Quarterly | Semiannually | Annually. |
| 50 to <75% | Bimonthly | Three times | Semiannually. |
| 75 to 100% | Monthly | Quarterly | Semiannually. |