Section 63.507 - [Effective 7/15/2024] Implementation and enforcement(a) This subpart can be implemented and enforced by the U.S. EPA, or a delegated authority such as the applicable State, local, or Tribal agency. If the U.S. EPA Administrator has delegated authority to a State, local, or Tribal agency, then that agency, in addition to the U.S. EPA, has the authority to implement and enforce this subpart. Contact the applicable U.S. EPA Regional Office to find out if this subpart is delegated to a State, local, or Tribal agency.(b) In delegating implementation and enforcement authority of this subpart to a State, local, or Tribal agency under subpart E of this part, the authorities contained in paragraph (c) of this section are retained by the Administrator of U.S. EPA and cannot be transferred to the State, local, or Tribal agency.(c) The authorities that cannot be delegated to State, local, or Tribal agencies are as specified in paragraphs (c)(1) through (6) of this section.(1) Approval of alternatives to the requirements in §§ 63.480 through 63.481 , 63.483(a) through (c) , 63.484 , 63.485(a) through (k), (m) through (s), (u) , 63.486 through 63.487 , 63.488(a), (b)(1) through (4), (5)(iv) through (v), (6) through (7), (c) through (i) , 63.493 through 63.494 , 63.500(a)(1) through (3), (b) , 63.501 , 63.502(a) through (f), (i), (k) through (m) , and 63.503 . Where these standards reference another subpart, the cited provisions will be delegated according to the delegation provisions of the referenced subpart. Where these standards reference another subpart and modify the requirements, the requirements shall be modified as described in this subpart. Delegation of the modified requirements will also occur according to the delegation provisions of the referenced subpart.(2) Approval of major alternatives to test methods under § 63.7(e)(2)(ii) and (f) , as defined in § 63.90 , and as required in this subpart.(3) Approval of major alternatives to monitoring under § 63.8(f) , as defined in § 63.90 , and as required in this subpart.(4) Approval of major alternatives to recordkeeping and reporting under § 63.10(f) , as defined in § 63.90 , and as required in this subpart.(5) Approval of an alternative to any electronic reporting to the EPA required by this subpart.(6) Approval of an extension request under § 63.6(i)(4)(ii) .68 FR 37349, June 23, 2003