(a) This subpart can be implemented and enforced by the Administrator, as defined in §63.2, or a delegated authority such as your state, local or tribal agency. If the Administrator has delegated authority to your state, local or tribal agency, then that agency (as well as the Administrator) has the authority to implement and enforce this subpart. You should contact your EPA Regional Office to find out if this subpart is delegated to your state, local or tribal agency.

(b) In delegating implementation and enforcement authority of this subpart to a state, local or tribal agency, the authorities listed in paragraphs (b)(1) through (4) of this section are retained by the Administrator and are not transferred to the state, local or tribal agency, however, the EPA retains oversight of this subpart and can take enforcement actions, as appropriate.

(1) Approval of alternatives to the emission limits, operating limits, and work practice standards specified in this subpart.

(2) Approval of a major change to test methods, as defined in §63.90, approval of any proposed analysis methods, and approval of any proposed test methods.

(3) Approval of a major change to monitoring, as defined in §63.90.

(4) Approval of a major change to recordkeeping and reporting, as defined in §63.90.