Public engineering firm profile
Gaithersburg, MD
Adaptive Engineering. Innovative Solutions.
Subsurface & Tunnel Engineering LLC (STE) specializes in the planning, design, and management of heavy civil tunnel and underground projects, including transportation, transit, water, wastewater, and mining developments. The practice combines extensive field experience with advanced engineering techniques and numerical modeling to provide optimum structural and geotechnical solutions. Its adaptive engineering approach allows clients to seamlessly accommodate evolving conditions throughout the duration of underground construction projects.
Specialized engineering services for heavy civil and underground construction projects, providing adaptive solutions to address complex ground conditions and structural challenges.
Comprehensive subsurface investigations and design services to ensure foundation stability and manage complex soil and rock behaviors.
Structural design and analysis for underground infrastructure elements, ensuring long-term durability and safety.
Professional advisory services spanning the planning, procurement, construction, and post-construction phases of major infrastructure assets.
Babylon, NY | Suffolk County | Wastewater
This replacement project involved the design of a temporary flood control system, pipe jacking, transition pipe, and a tunnel precast concrete segmental lining, along with tunnel boring machine face pressure evaluation and construction support services.
View project sourceLos Angeles, CA | Transit
This transit corridor project involved temporary support of excavation design, traffic deck design, utility support and hanging design, ground improvement, groundwater control, evaluation and assessment of instrumentation data, and construction impact assessments on existing structures.
Lake Buena Vista, FL | Wastewater
This sanitary sewer pipeline project involved launching shaft design and groundwater control services.
View project sourceWashington, DC | Tunnels
Work on this major tunnel project included construction impact assessments, evaluation and protection of existing structures, pre- and post-construction condition evaluations, independent design reviews, and tunnel connection design.
View project sourceLouisville, KY | Tunnels
This major tunnel project involved tunnel lining evaluation, value engineering, tunnel rock support system design, and construction support services.
View project sourcePrincipal
P.E.
Mohamed Younis applies over 30 years of experience in the management, design, and construction of large, complex water, transportation, and mine underground facilities and tunnel programs. He specializes in underground and tunnel design with experience in every aspect of delivery, including planning, design, and construction.