TETRA TECH INC

GSG provides high-end consulting and engineering services primarily to U.S. government clients (federal, state and local) and international development agencies worldwide. GSG supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology and disaster management. GSG also provides engineering design services for U.S. based federal and municipal clients, especially in water infrastructure, flood protection and solid waste.

GSG provides consulting and engineering services for a broad range of water, environment and sustainable infrastructure-related needs primarily for U.S. government clients. The primary GSG markets include water resources analysis and water management, environmental monitoring, data analytics, government consulting, waste management and a broad range of civil infrastructure master planning and resilient engineering design for facilities, transportation and local development projects. GSG's services span from early data collection and monitoring, to data analysis and information management, to science and engineering applied research, to engineering design, to project management and operations and maintenance.

GSG provides our clients with sustainable solutions that optimize their water management and environmental programs to address regulatory requirements, improve operational efficiencies and manage assets. Our services advance the resiliency of infrastructure, including design of energy efficiency and resource conservation programs, development of disaster preparedness and response plans and improvement in water and land resource management practices. We provide energy management consulting, and greenhouse gas ("GHG") inventory assessment, certification, reduction and management services. GSG also provides planning, architectural and engineering services for U.S. federal, state and local government facilities. We support government agencies with related resilient infrastructure needs, asset management for military housing and educational, institutional and research facilities.

Many government organizations face complex problems due to increased demand and competition for water and natural resources, newly understood threats to human health and the environment, aging infrastructure and demand for new and more resilient infrastructure. Our integrated water management services support government agencies responsible for managing water supplies, wastewater treatment, storm water management and flood protection. We help our clients develop more resilient water supplies and more sustainable management of water resources, while addressing a wide range of local and national government requirements and policies. Fluctuations in weather patterns and extreme events, such as prolonged droughts and more frequent flooding, are increasing concerns over the reliability of water supplies, the need to protect coastal areas and flood mitigation and adaptation in metropolitan areas. We provide smart water infrastructure solutions that integrate water modeling, instrumentation and controls and real-time controls to create flexible water systems that respond to changing conditions, optimize use of existing infrastructure and provide clients with the ability to monitor and manage their water infrastructure more efficiently. We provide operational technology for secure management of water treatment and wastewater systems, including cybersecurity assessments and digital twin solutions.

We also support government agencies in the full range of disaster response and community resilience services including monitoring and environmental response, damage assessment and program management services and resilient engineering design and mitigation planning. We have a full suite of Tetra Tech Delta technology and specialized software that support our disaster response, planning and management support services. These tools and procedures address disaster management and community resilience data management needs, including information technology systems, portals, dashboards, data management, data analytics and statistical analysis.

GSG provides a wide range of consulting and engineering services for solid waste management, including landfill design and management, and recycling facility design throughout the United States; providing design, project management and maintenance services to manage solid and hazardous waste; as well as innovative renewable energy projects such as solar energy-generating landfill caps; and providing full-service solutions for gas-to-energy facilities to efficiently use landfill methane gas.

We provide high-end advanced analytics and information technology ("IT") consulting and support to various federal clients including AI applications, machine learning, modernization of IT systems and cloud migration. We design solutions to manage and analyze data for major federal agency programs including data related to health, security, environment and water programs. We provide technical support for the Federal Aviation Administration to optimize the U.S. airspace system and support for related aviation systems integration for the U.S. and other countries' metropolitan airports. We provide specialized software products, modeling and data analytics for airspace acoustic analysis. Our aviation airspace services include data management, data processing, communications and outreach and systems development; and providing systems analysis and information management.