(a) After receipt of notice of withdrawal of approval of a State plan, such plan, or any part thereof, shall cease to be in effect and the provisions of the Federal Act shall apply within that State. But the State, in accordance with section 18(f) of the Act, may retain jurisdiction in any case commenced before receipt of the notice of withdrawal of approval of the plan, in order to enforce standards under the plan, whenever the issues involved in the case or cases pending do not relate to the reasons for withdrawal of the plan.

(b) Such notice of withdrawal of approval shall operate constructively as notice of termination of all related grants authorized under section 23(g) of the Act in accordance with 29 CFR 1951.25(c).