GTA was the expert witness to evaluate the movement of a steep fill slope impacting an existing WMATA railroad rack and bridge abutment over native marine clays.
SPT borings were drilled to depths of 100 feet to sample the soil conditions and install inclinometers and piezometers to monitor slope movement and water level fluctuations.
li> Direct and torsional shear tests were performed to support stability analysis.
400’ x 100’, 20’‑deep, excavated pond with a 6’ wave machine for testing amphibious vehicles for beachfront assaults at Aberdeen Proving Grounds, MD.
Services included geotechnical explorations and recommendations, design of a 32’ tall reinforced earth retaining wall, and slope stability analysis for the dynamic forces imposed by underwater charges of up to 500 pounds of TNT equivalent.
Piezometers were installed to depths of 50’ to evaluate groundwater levels.
Geotechnical and environmental consulting for the 23-story, 750,000-SF, mixed-use building with apartments, condominiums, retail, and parking.
COT services and environmental consulting during construction of building’s foundation.
Instrumentation and monitoring plan to monitor settlement of a century old brick-lined stormwater tunnel supported on timber piles, located less than 10 feet from the proposed 3- to 6-foot diameter caissons.