San Francisco County, CA Underwater Utility Directional Bore Hard Rock Directional Drilling provides San Francisco County, CA with underground and underwater utility infrastructure construction services via Horizontal Auger Boring, Tunneling and Horizontal Directional Drilling (HDD) more commonly called Directional Boring. We provide underground utility construction services specializing in the underground boring of utility pipelines for … Continue reading San Francisco County, CA Hard Rock Directional Drilling