GZA is nationally recognized for the wide range of geotechnical, environmental, civil and permitting services that we provide for our nation’s infrastructure.  Through integration of our service capabilities, we offer a broad technical approach to technical issues and provide cost-effective and technically appropriate solutions to complex challenges while mitigating risks associated with the greatest unknown – the ground.  

Our engineers have worked on various types of new and renovated infrastructure projects.  We have provided services to owners, government agencies, engineers, contractors, architects, institutions, construction managers, and developers on traditional design-bid-build work, design-build, Public Private Partnerships (P3), and Construction Manager/General Contractor (CM/GC) projects.  Through this experience, our senior staff have learned to appreciate the difference in our clients' expectations for the various roles we fill on projects.  


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Architectural & Engineering Firms
Airports/Aviation Authorities
Mass Transit Authorities
Parking Authorities
Bridges and Highways

GZA integrates its geotechnical, hydraulic, environmental engineering, and ecological services to assist bridge, tunnel, and roadway owners and designers efficiently and cost-effectively. This broad technical approach fosters cost-effective and technically appropriate solutions to complex infrastructure challenges.

GZA’s pragmatic engineering approach considers the possibilities of reusing existing substructures and widening existing structures, if possible, as well as designing new ones. Our in-depth knowledge of local, state, and federal regulations governing protection of natural resources limits delays and helps address stakeholder concerns. 

  • Deep and Shallow Foundations 
  • Retaining Walls
  • Earth Support Design and Dewatering 
  • Soil and Rock Slope Analysis and Stabilization 
  • Site-Specific Seismic Analysis
  • Foundation and Embankment Settlement
  • Ground Improvement Techniques
  • Design of Cofferdams
  • Geotechnical Instrumentation and Deep Foundation Testing
  • Pile Driving System Evaluations
  • Static and Dynamic Pile Testing
  • Blasting and Vibration Control
  • Sediment Quality Analyses and Management
  • Hydraulic Analysis & Scour Evaluation
  • Dredging Feasibility Studies
  • Permitting
  • Wetlands Delineation
  • Erosion and Sedimentation Control Design 
  • Wildlife/Fisheries Habitat and Resource Evaluations 
  • Demolition and Decommissioning
Heavy and Light Rail

GZA has significant experience serving commuter, short line and Class 1 railroad owners, contractors and designers throughout the Northeast, from Maine to Pennsylvania and south to South Carolina.   

This experience, coupled with our exemplary safety record and program, makes GZA an excellent choice to provide geotechnical, environmental and/or natural resource services on a myriad of rail projects, from rail rehabilitation to major expansions/ reconstructions.

  • Deep and Shallow Foundations
  • Earth Support Design and Dewatering
  • Soil and Rock Slope Analysis and Stabilization
  • Tunneling and Underground Construction
  • Instrumentation during Construction
  • Overpass and Bridge Inspection
  • Environmental Investigation and Remediation
  • Ecological Assessment and Restoration
Airports/Aviation Terminals & Runways

For more than 50 years, GZA has provided engineering-based solutions to subsurface/geotechnical and environmental issues at local and international airport facilities across the United States. 

Our experience includes terminal facilities, hangars, car rental facilities, fuel distribution and storage facilities, parking structures, hotels, aprons, elevated walkways, people movers, and roadways.  GZA has gained the insights necessary to successfully manage risk on the airside, conduct night work, plan for safety and security requirements, prepare detailed work authorizations, and collaborate with multi-discipline teams. We understand what it takes to scope and execute both large and small projects at these facilities – and meet budget and schedule goals, as well as provide cost-effective and environmentally sound approaches to satisfy client and environmental regulatory agency requirements. 

  • Deep and Shallow Foundations 
  • Expansions and Seismic Upgrades of Facilities
  • Subsurface Investigations 
  • Geotechnical Instrumentation and Deep Foundation Testing 
  • Integrity Testing of Existing Piles
  • Rehabilitation of Retaining Walls/Seawalls
  • Stability Analyses of Slopes and Qalls
  • Hazardous Materials & Asbestos Management
  • Construction and Operation of Remedial Systems
  • Underground Storage Tank (UST) Management 
  • Wetland Delineation Assessment and Design 
  • Environmental Permitting
  • Stormwater Management 
  • Climate Change and Hazard Planning 
  • Construction Management  
Water & Wastewater Infrastructure

GZA provides engineering and instrumentation design and construction services for major water infrastructure projects ranging from small to large diameter tunnels to wastewater treatment plants.

GZA’s multidisciplinary approach allows us to address the many different aspects of water infrastructure, from environmental impacts to climate resiliency in the face of stronger storms and more extreme weather. We work with stakeholders to mitigate impacts, improve quality, and protect vital resources across the water cycle.

A water tank in Attleboro, MA

  • Combined Sewer Overflow (CSO) Tunnels, Detention and Retention Structures, and Facilities 
  • On-site Wastewater Treatment Plants & Disposal Systems
  • Deep and Shallow Foundation Design
  • Trenchless Installation Techniques
  • Underground Duct Bank and Manhole Analysis
  • Routing Studies
  • Underground Utility/Drainage Coordination
  • Soil Management Plans
  • Waste Management
  • Environmental Compliance
  • Environmental Impact Assessments & Permitting
  • Wetlands Delineation Assessment and Design
  • Construction Monitoring
Tunnel Services

GZA has worked on urban tunnel projects continuously for the past 35 years.  The company has provided geotechnical and environmental services on tunnel and mining contracts in New York, Boston, Ohio, and Providence, exceeding $17B in constructed value.  Other locations where GZA has provided geotechnical and/or environmental services associated with subway, wastewater, utility, water tunnels and nuclear waste caverns in tunnels include Buffalo, Rochester, Cleveland, Detroit, Illinois, Seattle, Chicago, Baltimore, Philadelphia, Washington, D.C., West Virginia, Kentucky, Tennessee, New Mexico, Washington State, Nevada and Taiwan.

Example projects include GZA’s work on the Second Avenue Subway Tunnel in New York, design of the Consolidated Edison First Avenue Steam Tunnel, construction of the North Dorchester Bay CSO Storage Tunnel in Boston, Big Walnut Outfall Augmentation Sewer in Columbus, Ohio, the No. 7 Line Subway Extension in New York as well as pre-bid design services for the Port of Miami tunnel in Florida and the SR99 tunnel in Seattle.  GZA also provided geotechnical/tunnel design on the Third Catskill and Delaware Aqueduct for the New York City DEP which involved tunnel construction in limestone and shale.

GZA has offered services to both owners and contractors, which is a testament to their practical, cost-effective solutions for underground challenges and the confidence that their clients have in their abilities.  

  • Subsurface Explorations
  • Rock Packer Testing 
  • Engineering Geology & Geotechnical Engineering
  • Soil & Rock Bored Tunnels
  • Cut-and-Cover Tunnels
  • Mined Caverns/Drill & Blast Method
  • Raised Bore Technology
  • Seismic Design
  • Temporary Works Access Shafts and Tunnels
  • Entranceways, Ventilation Shafts
  • Groundwater Modeling
  • Ground & Building Movement Evaluation
  • Blasting & Vibration Control
  • Ground Improvement
  • Grouting
  • Trenchless Installation Techniques
  • Tunnel Inspections 
  • Tunnel Rehabilitation/Repair
  • Geotechnical Instrumentation
  • Geotechnical Baseline & Interpretive Reports
  • Construction Impact Assessment Reports
  • Risk Registers
Building Services

GZA is known as a premier consultant in the fields of environmental site investigation and remediation, geotechnical engineering, and other subsurface consulting, however, our diverse professional staff can provide diverse cross-disciplined services for real-estate property, which is often part of large infrastructure projects.

Whether the project involves assistance through a real estate transaction, investigation of on-going building problems or deficiencies, preparing for demolition, emergency response, or geotechnical monitoring during construction, GZA is ready and able to support your building needs above ground and below.  

  • Foundation Engineering
  • Ground Improvement
  • Seismic Design
  • Pavement Design
  • Environmental Consulting
  • Brownfields Redevelopment
  • Environmental Site Assessment
  • HAZMAT Surveys & Abatement
  • Indoor Air Quality Services
  • Remedial Design & Construction 
  • Property Conditions Assessments
  • Pre-Construction Surveys
  • Geotechnical Instrumentation Monitoring
Contract Services

Solely focused on the construction industry, GZA’s Contractor Services Division is intimately familiar with the fast-paced complexities of heavy civil, heavy highway, and marine construction projects. 

Empowered by a team of dedicated engineers and decades of experience on small to mega-large construction projects, we are prepared to assist Contractors with Geotechnical Instrumentation, Design, Foundation Testing, Demolition, QAQC , as well as unforeseen events, swiftly.

Strengthened by the support of GZA’s full complement of services, our Contractor Services Division goes beyond traditional services to address geotechnical, structural, and civil engineering requirements as well as environmental, water, and ecological issues, without needing to go out of house.

  • Geotechnical Instrumentation
  • Construction Field Control & Monitoring
  • Deep Foundation Testing
  • Excavation Support Design
  • Groundwater Controls
  • Hazardous Waste & Contaminated Materials Management
  • Pre- and Post-Construction Structural Condition Surveys
  • Air Quality, Noise & Vibration Monitoring and Analysis
  • Pre-Bid & Value Engineering
  • Structural Construction Engineering
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