Delon Hampton & Associates (DHA) provided civil engineering design and utility relocation support for the fast-track design-build construction of the Washington Nationals Baseball Stadium. We designed the groundwater collection and underdrain system, underground storage vault, and groundwater blanket system which treats groundwater prior to it reaching the local treatment facility. We researched existing utility data from a wide variety of sources and discovered many abandoned (former federally-owned) utilities located in and adjacent to the project site. Our staff prepared extensive utility relocation plans for water, sewer, combined sewer, and storm drain lines. We arranged for and managed the TV inspections of the 11’-6” diameter storm drain and 48” sanitary sewer that remain under the stadium structure. We prepared utility relocation plans for 2,400 linear feet of new 12” water main, 300 linear feet of new 18” storm drain line, and 100 linear feet of new 15” sanitary sewer line with a new 50’ deep special design sanitary drop manhole.
DHA also coordinated utility relocation design for electric service lines prepared by Pepco, telephone relocation design prepared by Verizon, and gas relocation design prepared by Washington Gas. We prepared utility demolition and shutoff plans for a total of 25-acres of property that forms the new stadium site. A total of 30-acres of land was eliminated from the combined sewer area of the central Distrct as a result of our efforts. We also coordinated ongoing utility relocation work with South Capitol Street Viaduct reconstruction work being prepared by DDOT.