An application which involves the disposal of a waste containing radioactive materials shall be accompanied by a letter or other instrument in writing from the commission, the Texas Department of Health, or any other appropriate authority stating either that the applicant, or the person delivering the waste containing radioactive materials for disposal by the applicant, has a license from the commission, the Texas Department of Health, or any other appropriate authority governing waste containing radioactive materials; or that the applicant or the person served by the applicant does not need such a license. This section does not apply to applications under Chapter 336 of this title (relating to Radioactive Substance Rules).