D.C. Code § 10-511.02: Tunnel under Capitol Grounds and Botanic Garden grounds — Construction.

Subject to the approval of the Architect of the Capitol and to such conditions as he may prescribe, the Mayor of the District of Columbia is authorized to make such use of square W-576 and reservations 12 and 6B as may be necessary for the construction of the tunnel, including borings and other preliminary work and storing of materials, and the reconstruction of that section of the Tiber Creek sewer located under square W-576 and reservation 6B.