Washington, D.C. Construction Horizontal Directional Drilling Association Horizontal Directional Drilling Association provides Washington, D.C. with underground utility and infrastructure construction services via tunnel construction services, horizontal auger boring and (HDD) horizontal directional drilling more commonly called directional boring. We provide underground utility construction services specializing in the underground boring of utility pipelines for satellite, cable, … Continue reading Washington, D.C. Horizontal Directional Drilling Association