Dennis Doherty, P.E., F.ASCE has joined Haley & Aldrich as a senior trenchless technology engineer.

Doherty is a Fellow of the American Society of Civil Engineers and is a recognized leader in trenchless technology, with a passion for underground infrastructure asset management for public agencies and private utility companies. His new installation experience using trenchless technology includes pipe bursting, microtunneling (including in-line microtunneling), auger boring, pipe jacking, pilot tube method, and horizontal directional drilling. He is highly experienced in design of microtunneling, HDD, auger-bore, CIPP lining, pipe bursting and manhole rehabilitation methods. His pipeline rehabilitation experience ranges from spot repairs for small municipal sewer systems to sliplining of large diameter interceptors, as well as cured-in-place pipe lining and gunite lining. He has served as technical advisor on complicated underground utility projects requiring technical memoranda for policy makers and decision makers.

Doherty has extensive experience in the evaluation, design, and construction of wastewater collection systems including complex CSO separation projects in highly urbanized areas, as well as a variety of other underground infrastructure. His 20-plus years of experience in civil and environmental engineering encompasses the range of project phases from site plan design to design of rehabilitation and new installation projects and engineering services during construction. He was vice chairman of the joint task force on sanitary sewers for the recent revisions to the ASCE/WEF Gravity Sanitary Sewer Design and Construction Manual and was instrumental in adding a new chapter on trenchless installation methods. He also was one of several principle authors of the ASCE Standard Construction Guidelines for Microtunneling. He is currently chairing a subcommittee to revise the standards section on planning.

He currently serves on the board of directors at Buried Asset Management Institute-International, and is a member of the American Society of Civil Engineers (ASCE) (Fellow Grade), NASTT, WEF, AWWA and New England Water Environment Association (NEWEA). He has served on a number of professional organizations’ committees regarding trenchless installation methods including pipe bursting, auger boring, microtunneling, and underground pipeline asset management.

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