As of April 6, 2015, the provisions of subpart AA shall replace the provisions of subpart X, §§51.900 to 51.918, which will cease to apply, with the exception of the attainment date extension provisions of §51.907 for the anti-backsliding purposes of §51.1105(d)(2).

[80 FR 12312, Mar. 6, 2015]


Tried the LawStack mobile app?

Join thousands and try LawStack mobile for FREE today.

  • Carry the law offline, wherever you go.
  • Download CFR, USC, rules, and state law to your mobile device.