(303)732-3692 (CO)   |   (732)410-9335 (NJ)

100+ years of combined Industry experience 

Click here to add a short description


Todd M. Kilduff, PE 


Todd Kilduff is founder and President of Kilduff Underground Engineering, Inc. (KUE). He has over 25 years’ experience in underground design and construction, serving as both a Contractor and Engineer on large tunnel, trenchless and various other underground projects such as deep shafts, large site excavations and mining facilities. His ability to be equally familiar with the design and construction aspects of underground projects allows him to be efficient in the design and execution of providing construction oversight. As president, Mr. Kilduff oversees all aspects of the business including business development, project management and office administration.

Todd earned a degree in Civil Engineering from the Ohio State University in 1996, followed by a masters degree in Geotechnical Engineering from the Virginia Polytechnic Institute in 2000. Todd is currently licensed in CO, MT, TX, NY, NJ, PA & VA, and is verified through NCEES.

Meet the KUE Team

Sean Sundermann, PG, CEG

Principal/Vice President

Sean Sundermann is Vice President and Partner with KUE.  He has 18 years of industry experience focused on trenchless technology & tunnel design, geohazard analysis, planning and execution of geotechnical site investigations and management of pipeline projects. With KUE, Sean is responsible for business development, proposal and project management. Sean earned a degree in Geological Sciences from the University of Colorado in 2000, followed by a masters degree in Structural Geology in 2002. He has professional Geologist licensure in CA, CO, WY, UT & TX and is a Certified Engineering Geologist in CA.

Karen Armfield, PE

Vice President / Principal Geotechnical Engineer

Karen has over 20 years’ experience providing engineering foundation solutions and ground improvements for various types of infrastructure. She has conducted soil testing, site investigations and has also served as an adjunct professor for over fifteen years teaching students the properties and behavior of soils. Ms. Armfield has varied experience providing foundation recommendations for shallow and deep foundation design, pile design, drilled shaft design and load testing. Karen is well versed in site improvement techniques and soil stability; including embankment design, slope stability analysis, ground improvement, dredging, pavement design, settlement analysis and retaining wall design. In addition, Karen has experience using several geotechnical software applications including: slope stability analysis, sheet pile analysis, soil structure interaction analysis, axial capacity of piles, lateral load analysis of piles and finite element analysis of soils. 

With KUE, Karen provides geotechnical oversight and excavation support designs for deep shaft and large excavations. Mrs. Armfield performs the planning and oversight of geotechnical explorations and laboratory testing of geotechnical samples. She routinely prepares Geotechnical Data, Interpretive and Baseline Reports as well as geotechnical investigative reports.

Michael Tinney, PE

Sr. Project Engineer

Mike is a Project Engineer at KUE who offers a diverse skillset in underground design, geo-structural and construction inspection. He has been involved w/ the design of tunnel initial support systems, excavation support & geo-structured support systems. Additionally, Mike has extensive experience in the planning and execution of subsurface investigations and laboratory testing programs.

Mike received an undergraduate degree in Environmental Science in 2009 from the University of Leeds in West Yorkshire, England, and a masters degree in Mining & Earth Systems Engineering from the Colorado School of Mines in Golden, Colorado, in 2015. Mike is a licensed P.E. in CO and UT.

Paul Wilkinson

Senior Microtunneling Consultant

Paul Wilkinson has 31 years of experience with trenchless and microtunneling projects worldwide.  Formerly serving as General Manager for Iseki Euro, Mr. Wilkinson consulted and provided microtunneling equipment to Todd to facilitate numerous microtunneling projects throughout the United States. Paul has personally overseen the installation of over 120 KM of microtunnel, on over 200 projects in 35 countries. With KUE, Paul provides consulting on complex microtunneling and trenchless projects as well as pursues business development efforts.

Shrey Arora, PE

Project Engineer

Shrey is a Project Engineer at KUE, specializing in the design and implementation of dewatering systems for the support of underground structures. He is proficient in the use of Rocscience RS2 & RS3, Carlson, UDEC, Matlab, Rocklab, Examine 2D, and COMSOL. Shrey has modeled tunnel initial support, final lining & excavation support systems as well as ground water and slope stability problems.

Shrey received his undergraduate degree in Mining Engineering from the National Institute of Technology in Karnataka, India in 2012, and completed a master’s degree in Mining Engineering at West Virginia University in 2014. Shrey also earned a masters degree in Underground Construction and Tunneling from the Colorado School of Mines in 2018. 

In March of 2021, Shrey passed the PE exam and is now the third member of KUE to be a licensed and registered engineer.

David Agan, EI

Staff Engineer

David is a Staff Engineer at KUE, responsible for performing design calculations for trenchless technologies and support of excavation. He is also responsible for modeling of support of excavations, and the visualization and drafting of tunnel alignments and geotechnical data for reporting and presentations. David graduated from the University of New Hampshire (UNH) in 2016 with an undergraduate degree in Civil Engineering.

Wenpeng "Frank" Liu, PhD

Staff Engineer

Dr. Wenpeng "Frank" Liu, PhD brings vast experience in mining, tunneling and geotechnical engineering to the firm. Upon receiving hi PhD, Frank worked as a research assistant at the Colorado School of Mines managing research projects and leading research teams before working as a field engineer on the renowned Purple Line Extension project in Los Angeles, CA. He is familiar with laboratory testing of soils, exploration for site conditions, and field inspections.

With a heavy focus in Mining Engineering, Frank received his undergraduate degree in 2010 and a masters degree in 2012 from the China University of Mining and Technology (CUMT) in Xuzhou, China and his PhD from Penn State University in 2017.

David "Banks" Irelan

Staff Engineer

Banks graduated from the Colorado School of Mines in May 2020 with a B.S. in Civil Engineering and an emphasis in Structural Engineering. His experience in designing structures in steel, concrete, timber, and masonry are a boost to KUE's quickly growing team of young engineers. With KUE, Banks will play a key role in a majority of the firms trenchless design projects while also assisting our field team with Geotechnical Instrumentation & Monitoring

Ryan O'Connell, EI

Staff Engineer

Ryan is a Staff Engineer at KUE, responsible for performing design calculations and development of drawing packages related to trenchless technologies and support of excavation systems. He is proficient in the use of Rocscience Dips, Slide2, RS2 & RS3, RocSupport and UnWedge. Ryan has been involved with the design and modeling of tunnel initial support, final lining and excavation support systems. He has experience with planning and executing geotechnical site investigations.

Ryan earned his undergraduate degree in Geological Engineering and Geology from the University of Wisconsin-Madison in 2018, followed by a Masters degree in Underground Construction and Tunneling from the Colorado School of Mines in 2021.

Nathaniel White, EI

Staff Engineer

Nathaniel is a staff engineer at KUE with responsibilities ranging from supporting design calculations for trenchless technologies including axial load and hydraulic fracture analysis to designing, planning and managing underground excavations by blasting. Nathaniel has construction experience in drill and blast, digger-shields, pipe rams, and cast-in-place concrete liners. A recent graduate from the Colorado School of Mines in May 2021 with a B.S. in Mining Engineering, Nathaniel is eager to apply his studies and gain valuable experience working on the trenchless projects KUE supports nationwide.

Dale Petersen, PLS

Survey Department Lead

Dale has been actively involved in land surveying throughout Colorado for the past 42 years. He obtained an Associate’s Degree in Land Surveying from the Community College of Denver in 1978 and over the past 4 decades, Dale has worked on nearly every type of construction project imaginable and has managed crews on projects ranging from tens to hundreds of thousands in revenue. Having built a lengthy career in the construction surveying industry, Dale has been involved in projects for staking of mining claims, utility and construction staking, ALTA and property surveys, topographic mapping, section breakdown and boundary analysis, improvement location w/ flood and grade certificates, solar and Polaris azimuth observations, as well as vertical & horizontal control for aerial mapping.

With KUE, Dale is responsible for overseeing all field survey projects including shaft, tunneling and ground improvement monitoring through the completion of the firm’s trenchless construction projects.

Sean Harper

Survey & Instrumentation Specialist

Sean is the lead for all Survey & Instrumentation projects at KUE. His duties involve the planning,  installation and monitoring of survey points on active KUE job sites. Sean brings experience using various types of survey instruments and techniques, including boundary, Lidar, ALTA, topo mapping and construction staking surveys. His knowledge using Total Stations, GPS & Base Stations, as well as digital and auto levels enhances and expands KUE's I&M departments skillset. 

Sean received his undergraduate degree from the University of South Florida in 2001 and is in the process of earning his Certified Survey Technician certification (CST).

Kyle Scanlan

Marketing/Office Manager

Kyle is the Office & Marketing Manager at KUE. With a background in Sales Training and Marketing, he brings a unique and diverse skillset to the KUE team. Kyle received his undergraduate degree in Multimedia & Graphic Design from Champlain College in Burlington, VT in 2008.