40 CFR §63.11201

1. (a)You must comply with each emission limit specified in Table 1 to this subpart that applies to your boiler.
2. (b)You must comply with each work practice standard, emission reduction measure, and management practice specified in Table 2 to this subpart that applies to your boiler. An energy assessment completed on or after January 1, 2008 that meets or is amended to meet the energy assessment requirements in Table 2 to this subpart satisfies the energy assessment requirement. A facility that operates under an energy management program established through energy management systems compatible with ISO 50001, that includes the affected units, also satisfies the energy assessment requirement.
3. (c)You must comply with each operating limit specified in Table 3 to this subpart that applies to your boiler.
4. (d)These standards apply at all times the affected boiler is operating, except during periods of startup and shutdown as defined in § 63.11237, during which time you must comply only with Table 2 to this subpart.