Nothing in subsection (a) shall be construed to prohibit any State from adopting or enforcing, with respect to independent small business marketers of gasoline having monthly sales of less than 50,000 gallons, any vapor recovery requirements for mobile source fuels at retail outlets. Any vapor recovery requirement which is adopted by a State and submitted to the Administrator as part of its implementation plan may be approved and enforced by the Administrator as part of the applicable implementation plan for that State.
42 U.S. Code § 7625. Vapor recovery for small business marketers of petroleum products
Section 7624 of this title, referred to in subsec. (c), was in the original “section 324 of this Act”, meaning section 324 of the Act July 14, 1955. Sections 324 and 325 of that Act, were renumbered sections 323 and 324, respectively, by Pub. L. 96–300, § 1(b), July 2, 1980, 94 Stat. 831, and are classified to sections 7624 and 7625, respectively, of this title.
 See References in Text note below.
 So in original. The word “or” probably should appear at the end of subpar. (B).