Kempton Excavating is an excavation company specializing in directional boring and trenching services for both commercial and residential customers. We are known for our great service, excellent customer support, and affordable prices. Underground Construction Services: Directional boring, commonly called horizontal directional drilling or HDD, utilizes special machines that install underground conduit with virtually no impact to the surface area or disruption to traffic flow, landscaping or structures. When trenching or excavating is impractical, directional boring is the best method available.