Clean Solutions, Inc. runs a nuclear disposal site in a desolate area in the State of Arizona. The company has obtained the necessary Federal permits to operate the cite. The State of Arizona, however, has passed a law that the facility must place signs notifying the public of the location of the plant on every road within in a 50 miles radius of the operation. Clean Solutions, Inc., contends that it has the authority to operate from the Federal Agency and therefore, the State cannot place additional restrictions on their operations. Are they correct? Explain.