What changed in this filing

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Item 1. Business

2022-11-25 compared with 2021-11-24 · 91 added, 126 removed, 449 unchanged (33% of the section changed)

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Engineering News-Record ("ENR"), the engineering industry's leading magazine, has ranked Tetra Tech #1 in Water for 19 years in a row.

In 2021, we were also ranked #1 in environmental management, hydro plants, water treatment/desalination, water treatment/supply, and wind power.

ENR also ranked Tetra Tech in the top 10 in numerous categories, including dams and reservoirs, solid waste, environmental science, chemical and soil remediation, green building design, hazardous waste, solar power, and site assessment and compliance.

In 2022, we were also ranked #1 in environmental management, hydro plants, water treatment/desalination and water treatment/supply.

ENR also ranked Tetra Tech in the top 10 in numerous categories, including dams and reservoirs, marine and port facilities, wind power, solar power, solid waste, environmental science, chemical and soil remediation, green building design, hazardous waste and site assessment and compliance.

Our reputation for high-end consulting and engineering services and our ability to develop solutions for water and environmental management has supported our growth for more than 50 years.

Today, we are proud to be making a difference in people’s lives worldwide through our high-end consulting, engineering and technology service offerings.

In fiscal 2021, we worked on over 70,000 projects, in more than 100 countries on seven continents, with a talent force of 21,000 associates.

In fiscal 2022, we worked on over 80,000 projects, in more than 100 countries on all seven continents, with a talent force of 21,000 associates.

We are Leading with Science® throughout our operations, with domain experts across multiple disciplines supported by our advanced analytics, artificial intelligence ("AI"), machine learning and digital technology solutions.

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In supporting our clients, we seek to add value and provide long-term sustainable consulting, engineering and tec hnology solutions.

By combining ingenuity and practical experience, we have helped to advance sustainability by managing water, protecting the environment, providing renewable energy, and engineering green solutions for our cities and communities.

By combining ingenuity and practical experience, we have helped to advance sustainability by managing water, protecting the environment, providing renewable energy, restoring ecosystems and engineering green solutions for our cities and communities.

Our mission is to be the world's leading consulting and engineering firm solving global challenges in water and the environment that make a positive difference in people's lives worldwide.

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Tetra Tech Delta is continually expanding and includes cutting-edge tools on interpretive analysis, modeling of physical systems, forecasting and scenario analysis, optimization and operations research.

In implementing our Leading with Science® approach, we work with our clients to explore, incubate, and test solutions in our Tetra Tech Innovation Hubs ("Tt I-Hub").

Tt I-Hub provides a collaborative platform for exploration, testing, and formulation of new solutions in partnership with clients, academia and donor agencies.

Leading with Science® also means fully leveraging the collective expertise provided by our global talent force of 21,000 associates.

We actively share information, ideas and resources across our global operations through our network structure, guided subject matter teams and project team building.

Our annual Tech 1000 event engages Tetra Tech experts world-wide to solve client challenges and identify the best ideas for further development.

Our Tech 1000 event engages Tetra Tech experts world-wide to solve client challenges and identify the best ideas for further development.

We also proactively share emerging technology and new ideas through our knowledge transfer system, Tetra Tech Technology Transfer ("T4").

T4 facilitates our innovation culture through webcasts, blogs, multi-media and social media across our global operations.

Our Project Management Training Program provides comprehensive training in high-end project leadership skills through online training, virtual workshops and in-person events.

Reportable Segments

In fiscal 2021, we managed our operations under two reportable segments.

We manage our operations under two reportable segments.

Our Government Services Group ("GSG") reportable segment primarily includes activities with U.S.

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These reportable segments allow us to capitalize on our growing market opportunities and enhance the development of high-end consulting and technical solutions to meet our growing client demand.

We continued to report the historical results of the wind-down of our non-core construction activities in the Remediation and Construction Management ("RCM") reportable segment.

been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

We continue to report the historical results of the wind-down of our non-core construction activities in the Remediation and Construction Management ("RCM") reportable segment.

There has been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

Beginning of fiscal 2022, we aligned our operations to better serve our clients and markets, and created a new High Performance Buildings ("HPB") division in the CIG reportable segment.

As a result, we transferred some related operations in the GSG reportable segment to the CIG reportable segment.

Prior year amounts for reportable segments have been reclassified to conform to the current year presentation.

The following table presents the percentage of our revenue by reportable segment:

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Government Services Group

GSG provides consulting and engineering services primarily to U.S.

GSG provides high-end consulting and engineering services primarily to U.S.

government clients (federal, state and local) and development agencies worldwide.

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GSG also provides engineering design services for U.S.

municipal and commercial clients, especially in water infrastructure, solid waste, and high-end sustainable infrastructure designs.

GSG also leads our support for development agencies worldwide, especially in the United States, United Kingdom, and Australia.

based federal and municipal clients, especially in water infrastructure, flood protection and solid waste.

GSG also leads our support for development agencies worldwide, especially in the United States, the United Kingdom and Australia.

GSG provides consulting and engineering services for a broad range of water, environment and 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 engineering design for facilities, transportation, and local development projects.

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.

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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 more efficiently monitor and manage their water infrastructure.

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.

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We have a full suite of proprietary software tools and procedures 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.

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, for environmental, wastewater, energy, containment, mining, utilities, aquaculture, and other industrial clients;

providing design, project management and maintenance services to manage solid and hazardous waste, for environmental, wastewater, energy, containment, mining, utilities, aquaculture and other industrial clients;

as well as innovative renewable energy projects such as solar energy-generating landfill caps;

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We design solutions to manage and analyze data for major federal agency programs including data related to health, security, environment and water programs.

We use our Tt I-Hub to demonstrate and test technology solutions to facilitate rapid deployment by our clients.

We provide technical support for the Federal Aviation Administration ("FAA") to optimize the U.S.

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Our international development services include supporting donor agencies to develop safe and reliable water supplies and sanitation services, support the eradication of poverty, improve livelihoods, promote democracy and increase economic growth.

planning, designing, implementing, researching, and monitoring projects in the areas of climate change, agriculture and rural development, governance and institutional development, natural resources and the environment, infrastructure, economic growth, energy, rule of law and justice systems, land tenure and property rights, and training and consulting for public-private partnerships;

and building capacity and strengthening institutions in areas such as global health, energy sector reform, utility management, education, food security, and local governance.

Our programs span planning, designing, implementing, researching and monitoring projects and leverage advanced technology to collect, manage and provide analytics for our clients.

Key areas of focus include climate change, agriculture and rural development, governance and institutional development, natural resources and the environment, infrastructure, economic growth, energy, rule of law and justice systems, land tenure and property rights and training and consulting for public-private partnerships.

Our projects also include building capacity and strengthening institutions in areas such as global health, energy sector reform, utility management, education, food security and local governance.

Commercial/International Services Group

CIG primarily provides consulting and engineering services to U.S.

commercial clients, and international clients that include both commercial and government sectors.

CIG supports commercial clients across the Fortun e 500, renewable energy, industrial, manufacturing, and aerospace markets.

CIG primarily provides high-end consulting and engineering services to U.S.

commercial clients, and international clients inclusive of the commercial and government sectors.

CIG supports commercial clients across the Fortun e 500, renewable energy, industrial, high-performance buildings and aerospace markets.

CIG also provides sustainable infrastructure and related environmental, engineering, and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the United Kingdom, as well as Brazil and Chile.

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CIG provides planning, architectural and sustainable engineering services for commercial and government facilities.

We provide high-end design of sustainable energy, water, and GHG efficient solutions including civil, electrical, mechanical, structural, and hydraulic engineering for buildings and surrounding developments.

We provide high-end design of sustainable energy, water and GHG decarbonization solutions including civil, electrical, mechanical, structural and hydraulic engineering for buildings and surrounding developments.

We provide high-end services in addressing indoor health and associated assessment, consulting and retrofits of buildings to address indoor air quality and safety.

We also provide engineering services for a wide range of clients with specialized needs, such as data centers, security systems, training and audiovisual facilities, clean rooms, laboratories, medical facilities and disaster preparedness facilities.

CIG's international services, especially in Canada and Asia-Pacific, include high-end analytical, engineering, architecture, geotechnical, and project management services for infrastructure projects, including rail and roadway monitoring and asset management services, collection of condition data, optimization of upgrades and long-term planning for expansion;

CIG's international services, especially in Canada, the United Kingdom, and Asia Pacific, include high-end analytical, engineering, architecture, geotechnical and project management services for infrastructure projects, including rail and roadway monitoring and asset management services, collection of condition data, optimization of upgrades and long-term planning for

multi-modal design services for commuter railway stations, airport expansions, bridges and major highways and ports and harbors;

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CIG provides infrastructure design services in extreme and remote areas by using specialized techniques that are adapted to local resources, while minimizing environmental impacts, and considering potential climate change impacts.

include providing consulting, geotechnical, and design services to owners of transportation, natural resources, energy and community infrastructure in areas of permafrost or extreme climate regions.

These include providing consulting, geotechnical and design services to owners of transportation, natural resources, energy and community infrastructure in areas of permafrost or extreme climate regions.

CIG's energy services include support for electric power utilities and independent power producers worldwide, ranging from macro-level planning and management advisory services to project-specific environmental, engineering, project management and operational services, and advising on the design and implementation of smart grids, both domestically and internationally, including increasing utility automation, information and operational technologies and critical infrastructure security.

For utilities and governmental regulatory agencies, our services include policy and regulatory development, utility management, performance improvement, asset management and evaluation, and transaction support services.

For developers and owners of renewable energy resources such as solar grid and off-grid, on-shore and off-shore wind, biogas and biomass, tidal, and hydropower, and conventional power generation facilities, micro-grid and battery or alternative storage facilities, as well as transmission and distribution assets, our services include environmental, electrical, mechanical and civil engineering, procurement, operations and maintenance, and regulatory support for all project phases.

For utilities and governmental regulatory agencies, our services include policy and regulatory development, utility management, performance improvement and asset management and evaluation.

For developers and owners of renewable energy resources such as solar grid and off-grid, on-shore and off-shore wind, biogas and biomass, tidal, hydropower, conventional power generation facilities, micro-grid and battery or alternative storage facilities, as well as transmission and distribution assets, our services include environmental, electrical, mechanical and civil engineering, procurement, operations and maintenance and regulatory support for all project phases.

CIG supports industrial clients globally.

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and hazardous waste site remediation.

CIG also provides environmental remediation and reconstruction services to evaluate and restore lands to beneficial use, remediating, and restoring contaminated facilities at military locations in the U.S.

CIG also provides environmental remediation and reconstruction services to evaluate and restore lands to beneficial use, remediating, and restoring contaminated facilities in the U.S.

and around the world;

managing large, complex sediment remediation programs that help restore rivers and coastal waters to beneficial use;

constructing state-of-the-art water treatment plants for U.S.

commercial clients;

and supporting utilities in the U.S.

in implementing infrastructure needs.

in implementing restoration and environmental management programs.

Remediation and Construction Management

We continued to report the results of the wind-down of our non-core construction activities in the RCM reportable segment in fiscal 2022.

As of October 3, 2021, there was no remaining backlog for RCM as the projects were complete.

There has been no remaining backlog for RCM since fiscal 2018 as the projects were complete .

In May 2022, we received a cash settlement for the last $11 million RCM claim receivable in dispute resolution.

This settlement resulted in an immaterial gain in the third quarter of fiscal 2022.

There were no significant operating activities in RCM for fiscal 2022, 2021 and 2020.

Project Examples

Project examples are provided on our company website located at tetratech.com, including expert interviews, in-depth articles and project profiles that demonstrate our services acros s water, environment, sustainable infrastructure, renewable energy and international development.

Fiscal 2022 Reportable Segments

On the first day of fiscal 2022, we created a new High Performance Buildings division in our CIG reportable segment.

As a result, we transferred some related operations in our GSG reportable segment with annual revenue of approximately $170 million to our CIG reportable segment.

Beginning in the first quarter of fiscal 2022, our segment reporting will reflect this transfer and our historical comparisons will be revised to be consistent with the fiscal 2022 presentation.

We provide services to a diverse base of U.S.

state and local government, U.S.

federal government, U.S.

state and local government, U.S.

commercial and international clients.

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Client Sector 2022 2021 2020

state and local government 16.7% 14.7% 18.9%

federal government (1)

30.4% 33.6% 33.2%

state and local government 17.2 16.7 14.7

commercial 21.4 19.9 22.5

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federal government agencies are significant clients.

Agency for International Development ("USAID") accounted fo r 11.7%, 12.2% and 12.4% of our revenue in fiscal 2021, 2020 and 2019, respectively.

The Department of Defense ("DoD") accounted fo r 11.2%, 9.2% and 7.9% of our revenue in fiscal 2021, 2020 and 2019, respectively.

Agency for International Development ("USAID") accounted f or 11.0%, 11.7% and 12.2% of our revenue in fiscal 2022, 2021 and 2020, respectively.

The Department of Defense ("DoD") accounted for 9.7%, 11.2% and 9.2% of our revenue in fiscal 2022, 2021 and 2020, respectively.

We typically support multiple programs within a single U.S.

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commercial clients include companies in the chemical, energy, mining, pharmaceutical, retail, aerospace, automotive, petroleum and communications industries.

No single client, except for U.S.

No single client, except for the U.S.

federal government clients, accounted for more than 10% of our revenue in fiscal 2022.

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federal government proposals, including those of award, administration, modification and re-pricing.

The DCAA considers our cost accounting system, estimating methods and procedures, and

specific proposal requirements.

The DCAA considers our cost accounting system, estimating methods and procedures and specific

proposal requirements.

Operational audits are also performed by the DCAA.

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Our professional staff members hold frequent meetings with existing and potential clients;

give presentations to civic and professional organizations;

and present seminars on research and technical applications.

Essential to the effective development of business is each staff member's access to all of our service offerings through our internal Tetra Tech Delta and geographic networks.

give presentations to civic and professional organizations and present seminars on research and technical applications.

Effective development of business is facilitated by each staff member's access to all of our service offerings through our internal Tetra Tech Delta and geographic networks.

Our strong internal networking programs help our professional staff members to pursue new opportunities for both existing and new clients.

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Our strategic growth plans are augmented by our selective investment in acquisitions aligned with our business.

Acquisitions enhance plans to add new technologies, broaden our service offerings, add contract capacity and expand our geographic presence.

Acquisitions advance plans to add new technologies, broaden our service offerings, add contract capacity and expand our geographic presence.

Our long-established experience in identifying and integrating acquisitions strengthens our ability to integrate and rapidly leverage the resources of the acquired companies post-acquisition.

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and People – th e 21,000 staff at Tetra Tech and our partners, clients and communities worldwide.

In addition, our program is based on the Global Reporting Initiative ("GRI" ) Sustainability Report Framework, the internationally accepted sustainability reporting protocol for corporate sustainability plans, which includes three fundamental areas:

environmental, economic, and governance.

Our Sustainability Program is led by our Chief Sustainability Officer, who has been appointed by executive management and is supported by other key corporate and operations representatives via our Sustainability Council.

We have established a clear set of metrics to evaluate our progress toward our corporate sustainability goals.

Each metric corresponds with one or more performance indicators from GRI and include the following categories:

environmental (greenhouse gas emissions), economic, health and safety, information technology, human resources, and real estate.

Our overarching goal is to improve the lives of one billion people by 2030.

Because our biggest impact on the world is through the projects we perform for our clients, we are tracking the total number of lives improved from our projects.

We align our project impact analysis with the Global Reporting Initiative ("GRI") standards and the United Nations Sustainable Development Goals ("SDG's"), which measure social benefit and aim to reduce poverty in communities around the world.

In addition to our 1 Billion People Challenge, we report on our operational greenhouse gas emissions associated with Scope 1, 2 and 3 CO 2 e emissions.

We also report on human capital metrics that align with our commitment to developing a thriving employee community, including gender balance, racial and ethnic diversity in our workforce, employee engagement and professional development.

Our Sustainability Program is led by our Chief Sustainability Officer, who has been appointed by our Board of Directors and is supported by other key corporate and operations representatives via our Sustainability Council.

We continuously implement sustainability-related policies and practices and assess the results of our efforts in order to improve upon them in the future.

Most important to our program is the recognition of the significant environmental, social, and governance impacts of Tetra Tech's projects.

Our executive management team reviews and approves the Sustainability Program and evaluates our progress in achieving the goals and objectives outlined in our plan.

In 2021, we initiated a commitment to develop Science Based Targets as part of our tracking and execution of our Sustainability Program.

We also announced a new and expanded commitment to sustainability for the next decade with a goal to be Climate Positive & Carbon Negative by 2030.

Working with our clients, we will continue to advance the science of sustainability, and thereby magnify the scale of our climate-positive impact on the world.

Tetra Tech's Board of Directors Strategic Planning and Enterprise Risk Management Committee reviews and approves the Sustainability Program and evaluates our progress in achieving the goals and objectives outlined in our plan.

As part of the UNGC, we fulfill the annual Communication on Progress via Tetra Tech's Sustainability Report Card that is published on Earth Day.

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Our client base includes U.S.

government agencies such as USAID, the DoD, the U.S.

federal government agencies such as USAID, the DoD, the U.S.

Department of State, the U.S.

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government and commercial clients in Canada, Australia and the United Kingdom;

commercial sector, which consists primarily of large industrial companies and utilities;

commercial sector, which consists primarily of large

industrial companies and utilities;

and our international commercial clients.

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We include in our backlog only those contracts for which funding has been provided and work authorization has been received.

We estimate that approximately two-thirds o f ou r backlog at the end of fiscal 2021 will be recognized as revenue in fiscal 2022, as work is being performed.

We estimate that approximately two-thirds of our backlog at the end of fiscal 2022 will be recognized as revenue in fiscal 2023, as work is being performed.

However, we cannot guarantee that the revenue projected in our backlog will be realized or, if realized, will result in profits.

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• Equal employment opportunity.

Tetra Tech ensures that our practices and processes attract a diverse range of candidate, and that candidates are recruited, hired, assigned, developed, and promoted based on merit and their alignment to our values.

Tetra Tech ensures that our practices and processes attract a diverse range of candidates, and those candidates are recruited, hired, assigned, developed and promoted based on merit and their alignment to our values.

• Learning and development opportunities.

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As part of Tetra Tech's commitment to a culture of inclusion, our Employee Resource Group ("ERG") Program broadens and enhances company-wide interaction opportunities for our employees.

Our ERG is open to all and involves activities for both employees whose background is the focus of the ERG and those who are supportive of the group (also known as allies).

These global networks build on and coordinate with the many local networks that are already active throughout our operations and include groups focused on the experiences of Black, Latino, Pan-Asian, Women, Veterans, and LGBTQIA+ employees.

Tetra Tech's ERG is open to all associates and involves activities for both employees whose background is the focus of the ERG and those who are supportive of the group (also known as allies).

Professional Development.

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Participants from across our markets form teams to focus on client needs, receive briefings on our Tetra Tech Delta technologies from their peers, and hone their skills in designing strategies and pitching client solutions.

• Project Excellence Program.

• Project Management Training Program.

Tetra Tech develops Project Managers who are world class in their abilities and performance.

The program is led by our Chief Engineer and involves extensive training on how to effectively manage all components of a project.

Tetra Tech's Project Excellence Steering Committee sponsors the development and implementation of our comprehensive Project Management Training Program.

The training program has been designed to address all areas of the project life cycle.

Tetra Tech's Project Management Training Program is available to all employees and is focused on professional development, techniques for managing high-end projects and how to employ enterprise systems and dashboards.

Our Project Management Training Program provides comprehensive training in high-end project leadership skills through online training, virtual workshops and in-person events.

• Fearless Entrepreneur Program.

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Name Age Position

Batrack 63 Chairman and Chief Executive Officer

64 Chairman and Chief Executive Officer

Batrack joined our predecessor in 1980 and was named Chairman in January 2008.

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degree in Business Administration from the University of Washington.

Shoemaker 64 President

Shoemaker was appointed President in September 2019, having previously served as President of WEI Business Group from April 2015 to November 2017, and CIG from November 2017 to September 2019.

Shoemaker joined us in 1991, and has served in various management capacities, including project and program manager, water resources manager and infrastructure group president.

From 2005 to 2015, she led our strategic planning, business development and company-wide collaboration programs.

Her technical expertise is in the management of large-scale watershed and master planning studies, development of modeling tools and application of optimization tools for decision making.

Additionally, she is our Chief Sustainability Officer who leads our Sustainability Council to implement sustainability-related policies and practices company-wide.

Shoemaker holds a B.A.

degree in Mathematics from Hamilton College, a Master of Engineering from Cornell University and a Ph.D.

in Agricultural Engineering from the University of Maryland.

Burdick 57 Executive Vice President, Chief Financial Officer

Hudkins was appointed President in October 2022.

Hudkins has been with us for over 24 years in increasingly responsible positions.

She served as President of the Resilient & Sustainable Infrastructure Division from October 2021 to October 2022, President of the IEW Operating Unit from April 2021 to October 2022 and Vice President and Growth Initiatives Program Leader from October 2019 to October 2022.

Prior to this, Ms.

Hudkins served as Vice President and One Water Leader from May 2015 to October 2019.

She is a registered Professional Engineer and is a nationally recognized expert in high-end innovative water treatment solutions.

Hudkins holds a master's degree in Civil and Environmental Engineering from the Massachusetts Institute of Technology, and a bachelor's degree in Civil and Environmental Engineering from Duke University.

58 Executive Vice President, Chief Financial Officer

Burdick has served as our Executive Vice President, Chief Financial Officer since April 2011.

He served as our Senior Vice President and Corporate Controller from January 2004 to March 2011.

He served as our Senior Vice President, Corporate Controller and Chief Accounting Officer from January 2004 to March 2011.

Burdick joined us in April 2003 as Vice President, Management Audit.

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Name Age Position

Leslie Shoemaker

65 Executive Vice President, Chief Sustainability and Leadership Development Officer

Shoemaker was appointed Executive Vice President, Chief Sustainability and Leadership Development Officer in October 2022 after serving as Tetra Tech's President since September 2019.

Shoemaker joined us in 1991, and has served in various management capacities, including project and program manager, water resources manager and business group president.

From 2005 to 2015, she led our strategic planning, business development and company-wide collaboration programs.

Her technical expertise is in the management of large-scale watershed and master planning studies, development of modeling tools and application of optimization tools for decision making.

Since the inception of our sustainability program in 2010, she has served as Chief Sustainability Officer leading the formation and evolution of the program.

Shoemaker has facilitated leadership development for Tetra Tech's Leadership Academy program.

Shoemaker holds a B.A.

in Mathematics from Hamilton College, a Master of Engineering from Cornell University and a Ph.D.

in Agricultural Engineering from the University of Maryland.

She was inducted into the United States' National Academy of Engineers in 2022.

Amidon 55 Senior Vice President, President of CIG and the Client Account Management Division of CIG

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Argus has also been responsible for managing multidisciplinary contracts and projects in support of the U.S.

federal government (i.e., Navy, the U.S.

federal government (i.e., U.S.

Navy, the U.S.

Army Corps of Engineers ("USACE") and the EPA), state and municipal agencies and private clients nationwide.

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in Chemical Engineering from California State University, Long Beach.

Brownlie 68 Senior Vice President, Chief Engineer and Corporate Risk Management Officer

Brownlie was named Senior Vice President and Chief Engineer in September 2009, and Corporate Risk Management Officer in November 2013.

From December 2005 to September 2009, he served as a Group President.

Brownlie joined our predecessor in 1981 and was named a Senior Vice President in December 1993.

Brownlie has managed various operating units and programs focusing on water resources and environmental services, including work with USACE, the U.S.

Air Force, the U.S.

Bureau of Reclamation and DOE.

He is a registered professional engineer and has a strong technical background in water resources.

Brownlie holds B.S.

degrees in Civil Engineering from the State University of New York at Buffalo and a Ph.D.

in Civil Engineering from the California Institute of Technology.

Name Age Position

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in Business Administration from Miami University and is a Certified Public Accountant.

Christensen 68 Senior Vice President, Chief Information Officer

Christensen joined us in 1998 through the acquisition of our Tetra Tech NUS, Inc.

("NUS") subsidiary.

He is responsible for our information services and technologies, including the implementation of our enterprise resource planning system.

Previously, Mr.

Christensen held positions at NUS, Brown and Root Services, and Landmark Graphics subsidiaries of Halliburton Company where his responsibilities included contracts administration, finance, and system development.

Prior to his service at Halliburton, Mr.

Christensen held positions at Burroughs Corporation and Apple Computer.

Christensen holds B.A.

degrees from Brigham Young University.

Preston Hopson 46 Senior Vice President, General Counsel and Secretary

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degrees from Yale University.

Lemmon 62 Senior Vice President, Corporate Administration

Lemmon joined our predecessor in 1981 in a technical capacity and became a member of its corporate staff in a management position in 1985.

In 1988, at the time of our predecessor's divestiture from Honeywell, Inc., Mr.

Lemmon structured and managed many of our corporate functions.

He is currently responsible for insurance, health and safety and facilities.

Name Age Position

O'Rourke 48 Senior Vice President, Enterprise Risk Management

O'Rourke joined us in January 2018 as Vice President, Enterprise Risk Management and was appointed Senior Vice President, Enterprise Risk Management in November 2018.

For the prior 10 years, Mr.

O'Rourke served as Assistant Vice President of Professional Liability Claims at AIG.

Prior to this, he was a Senior Associate at the law firm of Seyfarth Shaw in Boston, Massachusetts.

O'Rourke has more than twenty years of experience in risk management, contract negotiation, claim resolution and litigation within the construction industry.

O'Rourke holds a J.D.

from Suffolk Law School and a B.A.

from Worcester State University.

Bernard Teufele 56 Senior Vice President, President of the Canada and South America Division of CIG

Teufele joined us through an acquisition in 2010.

He has over 23 years of consulting engineering experience as a leader of a highly diversified, high-end infrastructure practice and as a technical expert in the field of infrastructure monitoring and asset management.

Prior to his current role, Mr.

Teufele has managed operating units of increasing size and complexity with a primary focus on infrastructure, environmental sciences, civil transportation, and mining-related services doing work for municipal, provincial, and federal government clients in Canada.

He has managed key provincial infrastructure programs in Canada with a particular focus on the monitoring and assessment of roadway infrastructure and the development of asset management programs.

Teufele has a B.Sc.

in Applied Science from the University of British Columbia.

Available Information

Our website address is www.tetratech.com.

Our internet website address is www.tetratech.com.

We made available, free electronic copies of our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports through the “Investor Relations” portion of our website, under the heading “SEC Filings” filed under “Financial Information.” These reports are available on our website as soon as reasonably practicable after we electronically file them with the Securities and Exchange Commission ("SEC").

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Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 1. Business