DC Water CEO and General Manager David L. Gadis will be joined by DC Mayor Muriel Bowser, DC Water Board Chair Dr. Unique N. Morris-Hughes, and other District leaders, for the ceremonial blessing of "Mary," the massive tunnel boring machine (TBM) that will soon begin her underground journey to build part of the Potomac River Tunnel. The event, November 3, marks a major milestone on the project which will dramatically reduce combined sewer overflows and improve water quality in the District.