(a) Emission limitations and related provisions which are established in Pennsylvania plan approvals as federally enforceable conditions shall be enforceable by EPA. EPA reserves the right to deem plan approval conditions not federally enforceable. Such a determination will be made according to appropriate procedures, and be based upon the plan approval, the relevant approval procedures, or plan requirements which do not conform with the plan approval program requirements or the requirements of EPA's underlying regulations.

(b) Emission limitations and related provisions which are established in Pennsylvania general plan approvals as federally enforceable conditions shall be enforceable by EPA. EPA reserves the right to deem general plan approval conditions not federally enforceable. Such a determination will be made according to appropriate procedures, and be based upon the general plan approval, the relevant approval procedures, or plan requirements which do not conform with the general plan approval program requirements or the requirements of EPA's underlying regulations.