Trenchless Engineering Home Insights Publications Understanding geological history when selecting trenchless installation methods: Part two Part two of this three-part series looks closely at the complications associated with an HDD crossing in an over-deepened, coastal New England pre-glacial bedrock valley. Transmission weaves through a complex urban web Learn how PSE&G’s complex Bergen-Linden Corridor project in New Jersey required a high degree of collaboration and attention to detail to deliver the project successfully. Westport’s Pump Station No. 2 force main replacement project using HDD: A case study Learn how the Town of Westport, Tighe & Bond, and Haley & Aldrich collaborated to successfully replace a sanitary sewer force main using horizontal directional drilling. Understanding geological history for trenchless installations: Part one Read how understanding the geology and ground behavior when selecting a trenchless method can lead to lower risk with an associated decrease in cost of that risk. Risk-based engineering for trenchless installation projects The design and construction of projects using one or more trenchless installation methods is more than just a line on a piece of paper. Lessons from the Streetcar The use of trenchless technology in urban settings is firmly established, and the Atlanta Streetcar HDD project demonstrates how well it can succeed. ASCE to release new microtunnel guidelines Dennis Doherty, National Practice Leader for Trenchless Technologies, details the new microtunneling guidelines from ASCE. Design considerations for intersect method of HDD Haley & Aldrich’s Abhinav Huli and Dennis Doherty explore design considerations for using the intersect method of HDD.