Geotechnical Expertise

Langan earned its reputation as a premier geotechnical consultant by managing hundreds of projects involving complex, technically challenging sites where highly specialized site preparation, foundations, and fast-track engineering solutions were required. We work closely with our clients and the design and construction team to engineer cost-effective geotechnical solutions appropriate for proposed structures and the governing site conditions.

Mercedes-Benz Stadium

OVERVIEW
Langan was retained as the environmental and geotechnical engineer of record for Mercedes-Benz Stadium, home of the Atlanta Falcons. The 1.8-million-SF multi-purpose, 71,000-seat retractable roof stadium opened for the 2017 NFL Season. As the geotechnical and environmental consultant on the project, Langan continued its role throughout construction by providing asbestos abatement oversight, monitoring and testing of excavated soils to comply with the environmental soils management plan, underground storage tank closure management, storage tank closure assessments, vibration monitoring within the Marta Tunnel structure and geotechnical oversight of various foundation and ground improvement systems.

Location
Atlanta, GA

Client
Darden & Company

Services
Geotechnical
Environmental

Architects
HOK (360 Architecture)
Goode Van Slyke Architecture
Stanley Beaman & Sears
tvsdesign

Strategic Partner
ICON Venue Group


Gulf Intracoastal Waterway West Closure Complex

OVERVIEW
The GIWW West Closure Complex is a primary flood protection component of the Army Corps of Engineer's mission to protect the City of New Orleans and the largest pump station in the US. Langan spearheaded a full-depth pilot test and computer modeling program to evaluate the potential for base heave of the deep excavations, dewatering techniques, and overall constructability. Langan also provided geotechnical services, road subgrade stabilization, dewatering, spud piles, and access road construction.

Location
New Orleans, LA

Client
Gulf Intracoastal Constructors (Kiewit Federal/Traylor Brothers)

Services
Geotechnical
Site/Civil

Strategic Partner
U.S. Army Corps of Engineers


Dulles Rail Yard and Maintenance Facility

OVERVIEW
Langan provided geotechnical and environmental engineering services for the design-build Phase II, Package B – Dulles Rail Yard and Maintenance Facility. This 71 acre site being built as part of the WMATA silver line extension includes multiple large and small structures, including a train service and inspection building, warehouse, maintenance of way building, transportation and police building, and a train wash building.  The site also consists of a train layup yard, ancillary structures, employee parking lots, stormwater management facilities, and a network of interior railways and roadways.

Location
Sterling, VA

Clients
Washington Metropolitan Area Transit Authority (WMATA)
Metropolitan Washington Airports Authority (MWAA)

Services
Geotechnical
Environmental

Architect
Giuliani Associates Architects, Inc.

Strategic Partner
Hensel Phelps Construction


Hudson Yards Redevelopment

OVERVIEW

Hudson Yards encompasses 28 acres atop a working railyard on the West Side of Manhattan. Located between 10th and 12th Avenues from West 30th to West 34th Street, Hudson Yards is the largest private development in the United States and one of the most complex construction projects in New York’s history. The development includes more than 18 million SF of commercial and residential space, 14 acres of public space, cultural venues, and the world’s first Equinox Hotel.

With extensive knowledge of the overall West Side redevelopment plan, MTA No. 7 subway line design, and Eleventh Avenue Viaduct reconstruction, Langan played an integral role in many aspects of the Hudson Yards project. We worked closely with agencies including the MTA, Hudson Yards Development Corporation, NYCEDC, NYCDOT, NYCDEP, and Amtrak, conducted a site-specific seismic study, and performed a 3D Finite Element Analysis to evaluate the potential influence of drilled-shaft foundation loads on the No. 7 subway extension. Our work successfully passed the peer review process by MTA Capital Construction.

FOUNDATIONS FOR THE EAST YARD PLATFORM

The development of Hudson Yards transformed the West Side and New York City’s iconic skyline. For the massive development to succeed, two “platforms” had to be developed to bridge over 30 active train tracks and three rail tunnels.

The east platform is supported by 380 high-capacity caissons that transfer loads from the platform and buildings into the underlying bedrock. As the geotechnical and environmental engineer for the platform, Langan kept the project moving forward despite challenges. Our unconventional approach to caisson load tests, advanced geotechnical studies and field testing, and integration of geotechnical and environmental field work translated into significant foundation construction time and materials savings.

Location
New York, NY

Client
Hudson Yards, a Related Oxford Venture

Services
Geotechnical
Environmental
Site/Civil
Traffic & Transportation
Traditional Surveying
Terrestrial Scanning/BIM

Architects
Kohn Pedersen Fox
Skidmore, Owings & Merrill
Diller Scofidio + Renfro
Ismael Leyva Architects
Rockwell Group

Strategic Partners
Thornton Tomasetti
WSP


One Vanderbilt

OVERVIEW
One Vanderbilt is a 1,401-foot-tall office tower located next to the landmark Grand Central Station. The first major development under the Midtown East rezoning, the supertall tower project provided $220 million in transit infrastructure improvements, adding connections to the 42nd Street-Grand Central Terminal subway system, Metro-North, Grand Central Terminal, and future access to the Long Island Rail Road. The project also includes an observation deck, 14,000 SF pedestrian plaza connecting One Vanderbilt and Grand Central, and nearly $17 million invested in sustainable features resulting in LEED Gold and WELL Platinum certifications. Langan performed multidisciplinary services over an 11-year period, including geotechnical, site/civil, and traffic engineering; surveying; and construction inspection. Our integrated approach allowed the project to stay on schedule, despite impending delays during the excavation phase due to demolition challenges. Through an innovative excavation support system–as well as early planning, design, and permitting of major water and sewer replacements–excavation was able to start during demolition, which was a key driver in keeping the construction schedule on track.
AWARDS
2022 ASCE OCEA Honor Award
2022 Regional Plan Association, Project of the Year
2022 ACEC New York, Diamond Award
2022 ACEC National Recognition Award
2022 CTBUH Award of Excellence: Best Tall Building 400 Meters and Above
2022 CTBUH Award of Excellence: Geotechnical Engineering Award
2022 CTBUH Award of Excellence: Best Tall Office Building
2021 ENR New York, Best Projects: Office/Retail/Mixed-Use
2021 ENR New York, Best Projects: Excellence in Sustainability – Merit
2021 ULI Awards for Excellence in Development - Excellence in Office Development
2020 ENR New York, Regional Best Projects: Office/Retail/Mixed-Use Award of Merit
2018 AIA New York Design Awards: Urban Design, Merit Award

Location
New York, NY

Client
SL Green Realty Corporation

Services
Geotechnical
Site/Civil
Traffic & Transportation
Traditional Surveying
Terrestrial Scanning/BIM

Architect
Kohn Pedersen Fox

Strategic Partners
Hines
Severud Associates
Jaros Baum & Bolles


PortMiami Tunnel

OVERVIEW
The PortMiami Tunnel project was built in a public-private partnership (P3) and is the first large-diameter tunnel constructed in Florida's challenging soft sedimentary geology using a tunnel boring machine (TBM). The purpose of the PortMiami Tunnel is to relieve traffic congestion in downtown Miami by diverting car, truck, and bus traffic from nearby highways directly to the Port of Miami through twin 42-foot diameter tubes extending below the main ship channel. Langan evaluated the subsurface data to develop the geotechnical engineering parameters required for design of the bored tunnel and the TBM. We also observed and monitored early-phase testing consisting of foundation load testing and Cutter Soil Mixing for the U-wall and cut-and-cover portions of the project.
AWARDS
American Council of Engineering Companies Engineering Excellence Awards
Florida Engineering Society
American Society of Civil Engineers
American Road & Transportation Builders Association
Project Finance Magazine

Location
Miami, FL

Clients
Bouygues Construction
Jacobs Engineering Group

Service
Tender & Contract Phase Support
Geotechnical

Strategic Partners
Miami Access Tunnel Concessionaire
Florida Department of Transportation
Miami-Dade County
City of Miami


Four Seasons Hotel Miami

OVERVIEW
The 70-story, 789-foot Four Seasons Hotel Miami is the second tallest building in Florida. The mixed-use development includes a hotel; office, condominium, and retail space; and an adjoining 20-story podium and seven-story parking garage. Langan conducted extensive subsurface investigations to identify the relevant soil, rock, and groundwater conditions. We also performed soil/structure interaction analysis to evaluate potential building settlements.
AWARDS
FICE Engineering Excellence Award

Location
Miami, FL

Client
Millennium Partners

Service
Geotechnical

Architect
Handel Architects


UCI Medical Center Irvine-Newport

OVERVIEW
The University of California, Irvine (UCI) is expanding its Health Center for Advanced Care to create UCI Medical Center Irvine-Newport, a full-service academic health complex. The development includes a seven-story, 350,000 GSF hospital with an emergency department, inpatient bed services, operating rooms, pre/post observation beds, inpatient imaging, and support services. A four-story, 200,000 GSF ambulatory surgery center is also planned. Langan conducted comprehensive field explorations, reviewed prior Phase I and Phase II environmental studies, and developed a soil management plan to be incorporated into grading and construction documents. We also provided detailed guidance to address health and safety, soil disposal, vapor mitigation, and proper soil handling requirements.
AWARDS
2024 ASCE LA Section Awards, Outstanding Geotechnical Engineering Project

Location
Irvine, CA

Client
Hensel Phelps

Services
Geotechnical
Environmental

Architect
CO Architects

Strategic Partners
Stantec
Degenkolb
Culp & Tanner


Chase Center

OVERVIEW
Chase Center, the new state-of-the-art home of the Golden State Warriors, provides seating for 18,000 fans including a view deck and two public plazas, 580,000 square feet of office space, retail, restaurants, and underground parking. Some of Langan's key services included coordinating regulatory approvals for removal of hazardous materials and soil management, modeling groundwater for design and dewatering during construction, and addressing poor soil conditions by recommending the most appropriate foundations, shoring systems, and construction methods.
AWARDS
2020 CalGeo Outstanding Project
2020 DFI Outstanding Project

Location
San Francisco, CA

Client
Golden State Warriors

Services
Environmental
Geotechnical
Earthquake/Seismic
Site/Civil

Architects
Manica Architecture
Kendall/Heaton Associates

Strategic Partners
Magnusson Klemencic Associates
Mortenson Clark Joint Venture


JFK International Airport – Terminal 6

OVERVIEW

As part of the modernization of JFK International Airport, Terminals 6 and 7 are being redeveloped into a 1.2 million SF terminal complex with critical supporting roadways, utilities, an aircraft apron, and a ground transportation center. The state-of-the-art JetBlue terminal will offer nine gates for international and domestic flights, 100,000 SF of dining and retail amenities, and connections to JetBlue Terminal 5.

Anchoring the north side of the airport, this $3.9 billion project will help transform JFK Airport into a 21st-century global gateway.

Langan’s surveyors conducted a topographic and utility survey for the site, including airside areas, landside areas, and the adjacent taxiway; provided input on utility connections, site grading, and overall site design; and extracted data from our laser scans to create the digital terrain model and survey features in a Civil 3D CAD deliverable.

Additionally, we identified areas of environmental concern, assessed areas that may require future soil and groundwater investigations, and completed the baseline environmental assessment for the property. Our traffic team completed a detailed traffic circulation assessment and Maintenance and Protection of Traffic Plans to keep construction activities on schedule.

We are also performing a geotechnical investigation for the terminal design and infrastructure; providing studies focused on foundation recommendations, settlement analyses, seismic classification, pavement conditions, and potential construction challenges; and assisting with the feasibility design of a geothermal system.

The first gates are slated to open in 2026, with full project completion expected in 2028.

Location
Jamaica, NY

Clients
JFK Millennium Partners – a partnership between Vantage Airport Group, American Triple I, and RXR Realty
Port Authority of New York and New Jersey

Services
Geotechnical
Environmental
Surveying/Geospatial
Traffic & Transportation

Strategic Partners
Paslay Group
Corgan
Stantec
Severud Associates


Texas Tower

OVERVIEW
The Texas Tower in downtown Houston is a 47-story office tower with a 12-story podium and two below-grade levels. Langan performed a two-phase subsurface investigation; provided geotechnical design and construction recommendations for the tower mat, podium footings, and temporary and permanent retention drilled shafts and tieback anchors; and performed finite element modelling to calculate settlements and equivalent springs used in the structural analysis of the tower. Langan also provided quality assurance observation and verification during retention system and foundation construction.

Location
Houston, TX

Client
Hines

Service
Geotechnical

Architects
Pelli Clarke Pelli Architects
Kendall/Heaton Associates


CoreSite VA3 Data Center

OVERVIEW
This proposed technology park will convert a 21.75-acre site consisting of four existing buildings totaling 315,000 SF from office to data center purposes. For the site/civil scope of the project, Langan will finalize the proposed layout, per Fairfax County, Fairfax Water and Virginia Department of Transportation (VDOT) requirements, Virginia Department of Environmental Quality (DEQ) regulations, and client specifications. Langan's geotechnical services include a subsurface investigation, preparation of a geotechnical report and technical specifications, and design-phase services. Our environmental services consist of a due diligence hazardous materials assessment and a Phase I ESA. Additionally, we are providing landscape architecture and surveying services.

Location
Reston, VA

Client
CoreSite

Services
Site/Civil
Geotechnical
Environmental
Surveying/Geospatial
Landscape Architecture

Architect
NORR


Selected Projects