49 U.S.C. § 108 : US Code - Section 108: Pipeline and Hazardous Materials Safety Administration

      (a) In General. - The Pipeline and Hazardous Materials Safety
    Administration shall be an administration in the Department of
    Transportation.
      (b) Safety as Highest Priority. - In carrying out its duties, the
    Administration shall consider the assignment and maintenance of
    safety as the highest priority, recognizing the clear intent,
    encouragement, and dedication of Congress to the furtherance of the
    highest degree of safety in pipeline transportation and hazardous
    materials transportation.
      (c) Administrator. - The head of the Administration shall be the
    Administrator who shall be appointed by the President, by and with
    the advice and consent of the Senate, and shall be an individual
    with professional experience in pipeline safety, hazardous
    materials safety, or other transportation safety. The Administrator
    shall report directly to the Secretary of Transportation.
      (d) Deputy Administrator. - The Administration shall have a
    Deputy Administrator who shall be appointed by the Secretary. The
    Deputy Administrator shall carry out duties and powers prescribed
    by the Administrator.
      (e) Chief Safety Officer. - The Administration shall have an
    Assistant Administrator for Pipeline and Hazardous Materials Safety
    appointed in the competitive service by the Secretary. The
    Assistant Administrator shall be the Chief Safety Officer of the
    Administration. The Assistant Administrator shall carry out the
    duties and powers prescribed by the Administrator.
      (f) Duties and Powers of the Administrator. - The Administrator
    shall carry out - 
        (1) duties and powers related to pipeline and hazardous
      materials transportation and safety vested in the Secretary by
      chapters 51, 57, 61, 601, and 603; and
        (2) other duties and powers prescribed by the Secretary.

      (g) Limitation. - A duty or power specified in subsection (f)(1)
    may be transferred to another part of the Department of
    Transportation or another government entity only if specifically
    provided by law.