Principals
Mr. Yeh is the founder and a Principal of Yeh and Associates. He has more than 29 years of geotechnical engineering experience of which 13 years were with CDOT. He supervised the Soils and Foundation and the Engineering Geology units and was Chief Engineering Geologist during his tenure with CDOT. He provided geotechnical guidance to the central geotechnical staff and oversaw geotechnical aspect of all CDOT projects. Prior to joining CDOT, he gained geotechnical experience in commercial, residential, industrial and airfield development in private consulting. His areas of expertise include
foundation engineering, soils behavior, earth pressure, settlement,
slope stability,
retaining walls, and
pavement design. He has a Masters degree in civil engineering from the University of Colorado and is a registered professional engineer in two states.
Mr. Andrew is a Principal at Yeh and Associates with 24 years of experience in the geotechnical engineering and engineering geology field. He is noted for his ability to identify and provide the necessary expertise to challenging and complex projects.
Mr. Andrew was employed by CDOT for 10 years as Senior Engineering Geologist and has also been employed by a contractor that specializes in geotechnical related construction. This experience provides a unique perspective on
geological and
geotechnical engineering. He has managed numerous geologic and geotechnical investigation and design teams throughout Colorado, primarily in transportation development. His areas of expertise include geologic mapping,
rockfall,
rock slopes, landslide evaluation and mitigation, and other
geologic hazards. He has Bachelor degrees in environmental science and geology and a Masters degree in Engineering Geology from the University of Colorado and is a registered professional geologist in Wyoming.
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.
