Geotechincal Engineering Projects
Yeh provided geotechnical and geologic information regarding site conditions of the Crater Trail, damage due to severe erosion in areas, for repairs and reroute.
The Sperry Chalet was built by the Great Northern Railroad in 1913 and severely damaged in a fire in 2017. The reconstruction and restoration retained as much of the historic structure as possible. Yeh staff accessed the site on horseback, evaluated site conditions, and developed recommendations for allowable bearing capacity for new foundations.
Yeh performed geotechnical engineering work including field reconnaissance, wall assessments, wall evaluation, construction observation, and documentation of tieback repairs.
Yeh provided geotechnical design, construction inspection, soil and concrete testing services for MSE retaining structures, drilled shaft bridge foundations for 3 bridges, trail subbase soils, trail concrete, temporary shoring soil nails, rockfall mitigation, and a unique underpass structure which carries the trail under US Highway 6.
Yeh provided geotechnical services including complete tunnel geotechnical investigation and generation of the Geotechnical Data Report (GDR) supporting underground design for expansion of both the East- and Westbound tunnels. Yeh performed portal rockslope design and rockfall protection design for the east- and westbound tunnels. Additionally, Yeh performed deformation monitoring of both I-70 tunnels during widening construction.
Yeh staff provided landslide remediation including expanded polystyrene (EPS) and tiebacks.
Design and remediate a landslide and incorporate the repair reconstruction of a modular block retaining wall.
Construction Management Projects
Yeh performed construction QA, inspection, and materials testing for a rebuild of US 6 from Knox Court Bridge to the I-25 interchange. Project included building or replacement of 12 bridges, 26 retaining walls, construction of 5 miles of storm drains, and 15 lane miles of pavement. In addition, the project included improvements to four parks, a half mile bike path, new baseball and multi-use turf field, a new pedestrian bridge, sidewalks, and drainage/ irrigation.
The North Metro Rail Line (N Line) runs from Denver Union Station to 124th Avenue in Thornton. Yeh is providing geotechnical engineering services for all aspects of the retaining walls, bridges, and stations, and assisting at grade crossing and parking facilities. We also providing construction inspection and materials testing for all civil related work for all construction work.
Also known as US 6 and 19th Street Intersection, Yeh provided the construction management and inspection staff to the City of Golden to complete the local agency ‘Linking Lookout’ interchange project. This 4-phase project included a signature structure, deep foundations, park and pedestrian access, bicycle access and new pedestrian trails, numerous retaining walls of various types, and deep utility relocations.
The Southeast Rail Line Extension added 2.3 miles of light rail along I-25 from Lincoln Station, through the new Lone Tree City Center, to RidgeGate Parkway. The project included an end-of-line station, a five story parking structure with 1,300 parking spaces, bus transfer, and Kiss-N-Ride facilities. Yeh provided geotechnical engineering for design, along with construction quality inspections and materials testing for every aspect of construction including the retaining walls, three bridges, stations, parking structure, at-grade crossing, roads, and parking facilities.
Yeh provided materials testing and documentation as the Owners Verification Testing Service for the US 24 corridor improvements.