Key Personnel Bios
Mr. Arndt has over 14 years of experience in the geological and geotechnical engineering field. This includes working on transportation projects throughout the western U.S., forensic engineering, and underground mining experience. His areas of expertise include: evaluation and mitigation of unstable rock and soil slopes,
retaining wall design, and micropile
foundations. He currently designs mechanically stabilized earth retaining walls,
soil nails,
micropiles, piles, drilled shafts and ground anchors. He uses his geological and engineering background and experience to address challenging projects. He has a Bachelors degree in geology and engineering and a Masters degree in geological engineering from the Colorado School of Mines. He is a registered professional geologist in Wyoming and is a registered professional engineer in five states.
Mr. Allen has over 23 years of experience in geotechnical and materials engineering and construction management. His areas of expertise include: expansive soils; shallow
foundations; pier foundations;
slope stability; and
pavement design. He has broad experience in the geotechnical design and
materials testing aspects of heavy construction on transportation projects as well as, commercial and residential construction,
retaining walls and slope stabilization. Prior to joining Yeh and Associates, Mr. Allen worked for CDOT Region 5 where he was the project engineer on several of the projects Yeh worked on. He has a Bachelors degree in engineering and a Masters degree in civil engineering from the University of Arizona and is a registered professional engineer in Colorado.
Mr. Johnson has over 11 years of geotechnical experience in commercial and residential construction and engineering on a variety of public and private projects. Mr. Johnson has experience in design and construction of roadways, buildings and shoring structures. His areas of expertise include: evaluation and mitigation of unstable rock and soil slopes, design and construction of shoring systems in extreme terrain, and
micropile foundations. He also has skills in the discipline of forensic engineering. Mr. Johnson uses his diverse background to provide practical solutions to difficult geotechnical projects. He has a Bachelors degree in engineering geology and Masters degree in geological engineering from the Colorado School of Mines and is a registered professional engineer in two states.
Mr. LaForce has over 36 years of experience, most of which was with the CDOT. At CDOT, his last 21 years were related to materials engineering and testing. He spent the final 6 years with CDOT as Region 1 Materials Engineer overseeing project testing as well as supervising the preliminary engineering and pavement design of numerous projects and the Region Pavement System. He also spent 12 years the CDOT Research Section investigating such varied areas as asphalt recycling and pavement performance, swelling soils studies, tunnel ventilation and numerous construction product and procedure evaluations. With Yeh and Associates he has done many
pavement designs including several with foamed asphalt, as well as managed technicians performing
construction inspection and
materials testing on numerous CDOT and commercial construction projects. He has a Bachelors degree in chemistry from the Louisiana State University and is a registered professional engineer in Colorado.
Mr. Macklin has over 23 years of experience performing geotechnical engineering and engineering geology duties. Mr. Macklin was employed by the CDOT for 15 years and then worked for a civil contractor who specialized in retaining wall and ground stabilization in sensitive environments. His extensive and varied experience allows him to proactively identify and resolve engineering problems involving soil and rock. His range of design and construction strengths include: planning and conducting
geologic site characterization studies, estimating soil and rock properties,
soil nail walls, tieback anchors, mechanically stabilized earth
retaining walls, stabilization of steepened slopes,
micropiles, mitigating
geologic hazards, resolving slope stabilization problems and finite element modeling. He has a Bachelors degree in geology and a Masters degree in civil engineering from the University of Colorado and is a registered professional engineer in Colorado.
Mr. Strickland has over 28 years of experience in the geotechnical, mining and environmental engineering fields. Although the majority of Mr. Strickland’s project work has been in Colorado and the surrounding states, he has worked on projects throughout the U.S., Mexico, and Chile and has worked for both local and national engineering firms throughout his career. His experience provides a unique perspective on geotechnical engineering and the construction of commercial, residential and civil works projects. He has managed numerous geotechnical and environmental investigations, primarily in western U.S., which have addressed issues of expansive soils, collapsing soils, subsidence, shallow groundwater (with and without contaminants), RCRA and Superfund sites. His areas of expertise include: shallow and deep
foundations, expansive soils,
slope stability, and
pavement design. He has a Bachelors and a Masters degree in civil engineering from the University of Colorado and is a registered professional engineer in seven states.
