Horizontal Directional Drilling
Solutions for installing infrastructure under challenging obstacles while reducing impacts.
Horizontal Directional Drilling (HDD) reduces impact on the environment, existing underground infrastructure, and surface assets. Successful HDD project delivery requires detailed consideration of surface terrain, alignment constraints, subsurface conditions, pipe design criteria, client needs, contractual preferences, risk allocation, and third-party interests. Our HDD team of engineers and geologists draw upon their collective national and international experience to understand those challenges and deliver the right technology to traverse a variety of challenging underground conditions.
Brierley Associates is an internationally recognized authority in the selection, design, construction management, and forensic analysis of Horizontal Directional Drilling (HDD) solutions for water, wastewater, electrical and natural gas.
Horizontal Directional Drilling Engineering Capabilities
Feasibility, Design, Construction Management and Forensic Analysis for water, wastewater, electrical transmission, and natural gas pipelines projects within:
- Long reach crossings of waterways
- Critical transportation infrastructure
- Densely populated urban alignments
- Environmentally sensitive areas
- Challenging ground conditions
Horizontal Directional Drilling Projects
Our Horizontal Directional Drilling Team
Nick Strater, PG
Trenchless and HDD Sectors Leader
Bedford, NH
Nick Strater, PG's Bio
Nick Strater, PG
Trenchless and HDD Sectors Leader
Bedford, NH
Nick is leader of our Trenchless and HDD Sectors. His specialties include rock and soil tunnels; trenchless designs ranging from horizontal directional drilling to pilot tube auger bore; microtunneling; rock slope evaluation and stability; rock blasting and, forensic geology. Nick serves on American Society of Civil Engineers Trenchless Installation of Pipelines (TIPS) Committee and ASCE committees developing Manuals of Practice for pilot tube, auger boring, and the Direct PipeTM methods. Mr. Strater is a frequent invited lecturer on the topics of trenchless method selection, design and risk management. He has authored more than 25 industry papers and presentations on topics ranging from trenchless technology to rock slope stability assessment and mitigation strategies.
Brian Dorwart, PE, PG
Trenchless Specialist
Bedford, NH
Brian Dorwart, PE, PG's Bio
Brian Dorwart, PE, PG
Trenchless Specialist
Bedford, NH
Brian has more than 5 decades of experience and has built his career developing efficient trenchless solutions for a variety of applications ranging from new construction to pipe and tunnel rehabilitation. His areas of specialization include interaction of ground to excavation tools and natural environmental processes, and ground modification for construction. He applies this skillset to trenchless technologies including directional drilling and pipe rehabilitation and, construction of small to large tunnels. Using this experience, Brian delivers assessments of existing structures and evidence-based design of situation-appropriate rehabilitation technologies. Brian is a distinguished member of the North American Society for Trenchless Technologies Hall of Fame.
Tom Pullen, PG
Engineering Geologist
Cottage Grove, MN
Tom Pullen, PG's Bio
Tom Pullen, PG
Engineering Geologist
Cottage Grove, MN
Tom leads Brierley’s Upper Mid-West project efforts. He is another of Brierley’s project leaders who bring real-life perspective to design and troubleshooting, as he was a foreman for a utility contractor specializing in trenchless construction prior to his academic education. Tom’s experience includes underground design; geotechnical site characterization; trenchless design and construction; grouting programs and tunnel rehabilitation; and claims analysis and evaluation for both owners and contractors.