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. Pihl has over 23 years of experience in the engineering geology and geotechnical engineering field. His experience includes
geological hazards, ground stabilization in
tunnels, natural and excavated soil and
rock slopes as well as blasting inspection,
geologic mapping, geotechnical instrumentation, and
foundation construction. He has been involved in the design and construction phases of over 20 major highway projects in mountainous terrain, totaling over 750 million dollars in construction budget. He has a Bachelors degree in geology from the University of Colorado and is a registered professional geologist in Wyoming.
