If, in the conduct of a compliance review or an investigation, it becomes evident that another agency has jurisdiction over the subject matter, OCR will cooperate with that agency during the continuation of the review of investigation. EPA will:

(a) Coordinate its efforts with the other agency, and

(b) Ensure that one of the agencies is designated the lead agency for this purpose. When an agency other than EPA serves as the lead agency, any action taken, requirement imposed, or determination made by the lead agency, other than a final determination to terminate funds, shall have the same effect as though such action had been taken by EPA.