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Item 8. Financial Statements and Supplementary Data

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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FORM 10-K

Commission File Number 0-19655

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TETRA TECH, INC.
(Exact name of registrant as specified in its charter)

Securities registered pursuant to Section 12(g) of the Act:

None

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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ý No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.    Large accelerated filer ý    Accelerated filer o    Non-accelerated filer (Do not check if a smaller reporting company) o    Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o No ý

The aggregate market value of the registrant's common stock held by non-affiliates on March 28, 2013, was $1.9 billion (based upon the closing price of a share of registrant's common stock as reported by the Nasdaq National Market on that date).

On November 11, 2013, 64,163,177 shares of the registrant's common stock were outstanding.

DOCUMENT INCORPORATED BY REFERENCE

Portions of registrant's Proxy Statement for its 2014 Annual Meeting of Stockholders are incorporated by reference in Part III of this report where indicated.

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              This Annual Report on Form 10-K ("Report"), including the "Management's Discussion and Analysis of Financial Condition and Results of Operations," contains forward-looking statements regarding future events and our future results that are subject to the safe harbors created under the Securities Act of 1933 (the "Securities Act") and the Securities Exchange Act of 1934 (the "Exchange Act"). All statements other than statements of historical facts are statements that could be deemed forward-looking statements. These statements are based on current expectations, estimates, forecasts and projections about the industries in which we operate and the beliefs and assumptions of our management. Words such as "expects," "anticipates," "targets," "goals," "projects," "intends," "plans," "believes," "estimates," "seeks," "continues," "may," variations of such words, and similar expressions are intended to identify such forward-looking statements. In addition, statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses, and other characterizations of future events or circumstances are forward-looking statements. Readers are cautioned that these forward-looking statements are only predictions and are subject to risks, uncertainties and assumptions that are difficult to predict, including those identified below under "Risk Factors," and elsewhere herein. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

PART I

Item 1.    Business

General

              Tetra Tech, Inc. is a leading provider of consulting, engineering, program management, construction management, construction and technical services that focuses on addressing fundamental needs for water, the environment, energy, infrastructure and natural resources. We are a full-service company that leads with science. We typically begin at the earliest stage of a project by identifying technical solutions to problems and developing execution plans tailored to our clients' needs and resources. Our solutions may span the entire life cycle of consulting and engineering projects and include applied science, research and technology, engineering, design, construction management, construction, operations and maintenance, and information technology.

              We are a global provider of consulting and engineering services, renowned for our leadership in water-related services for public and private clients. Engineering News-Record ("ENR"), the leading trade journal for our industry, has ranked us the number one water services firm for the past ten years, most recently in its April 26, 2013, "Top 500 Design Firms" issue. In 2013, Tetra Tech was also ranked number one in water treatment and supply, environmental management, consulting studies, solid waste and wind power. ENR also ranks Tetra Tech among the top 10 firms in numerous other service lines, including environmental science, engineering/design, sanitary/storm sewers, chemical and soil remediation, site assessment and compliance, hazardous waste, industrial processes and manufacturing.

              Our ability to apply our skills to developing solutions for water management across a wide array of public and private sector needs has diversified our client base, expanded our geographic reach, and increased our ability to service both existing and emerging markets. We currently have more than 14,000 staff worldwide, located primarily in North America.

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Mission

              Our mission is to be the premier worldwide consulting and engineering firm, focusing on water, natural resources, the environment, infrastructure and energy. The following core principles form the underpinning of how we work together to serve our clients:

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Service.  We put our clients first. We listen closely to better understand our clients' needs and deliver smart, cost-effective solutions that meet their needs.



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Value.  We take on our clients' problems as if they were our own. We develop and implement real-world solutions that are innovative, efficient and practical.



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Excellence.  We bring superior technical capability, disciplined project management, and excellence in safety and quality to all of our services.



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Opportunity.  Our people are our number one asset. Opportunity means new technical challenges that provide advancement within the company, encouraging a diverse workforce, and ensuring a safe workplace.

Industry Overview

              We are part of the global consulting and engineering industry that serves public and private clients by addressing fundamental needs for water, the environment, energy, infrastructure and natural resources. Our industry provides clients with the technical studies, planning, engineering, design, construction management and construction services that respond to their needs. The industry's clients vary in size and scope from small local public agencies and private companies to national governments and large multi-national corporations. These clients seek service firms with high-caliber technical expertise, practical experience, multi-disciplinary capabilities and the global reach needed to analyze their problems in order to develop and implement the most appropriate, cost-effective solutions.

              Many government and commercial organizations face complex challenges due to increased demand and competition for water and natural resources, newly understood threats to human health and the environment, aging infrastructure, demand for new infrastructure in emerging economies, and diversification and development of energy resources. As a global company with a local presence in many areas around the world, we provide the breadth of technical knowledge and capabilities to solve our clients' diverse and challenging problems.

              Our water market supports government agencies responsible for managing water supply, wastewater treatment, stormwater and flood protection. Our water market also supports private sector clients that require water supply and treatment for industrial processes. We help our clients develop water supplies and manage water resources, while addressing a wide range of local and national government requirements and policies. We provide essential support for water and site management needs for resource extraction in the oil and gas and mining industries. Our water and environmental markets also include both government and commercial clients that are working to restore contaminated areas and protect uncontaminated areas. Our energy market consists of both government and commercial clients that seek to develop renewable energy resources, identify energy efficiency enhancements, and improve energy transmission. Our infrastructure market includes the design of public and commercial buildings and facilities, including high efficiency, low-energy use buildings. Our natural resources market provides support for the safe, sustainable extraction of necessary mineral resources and oil and gas, including the wide range of required services to meet water, environment, energy and infrastructure-related needs, sometimes in remote regions of the world.

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              Increasingly, the consulting and engineering industry is being asked to provide integrated solutions in a global marketplace. Large firms such as ours can offer fully integrated services, from front-end science and planning through construction management. Large firms that offer integrated solutions differentiate themselves from smaller firms that generally offer niche services by providing turn-key solutions intended to save time and money. As a large company with a history of leading with science, we are ideally suited to providing interdisciplinary solutions across our water and related service lines. As a provider of interdisciplinary services, we have increased our market share in each of the last several years.

              Public policy, demand for resources, infrastructure development challenges and natural forces constantly shape changes in our industry. Public concern over environmental issues, especially water quality, has been a driving force behind numerous regulations and changes in public policies and practices. Public and private clients are increasingly focused on water management, energy efficiency and sustainability. Fluctuations in weather patterns and extreme events, such as droughts, hurricanes or flooding, are driving concerns over the reliability of water supplies and the need to protect coastal areas and upgrade water infrastructure. Energy policies, resource limitations and concern about climate change have encouraged the implementation of energy conservation measures, retrofits to existing structures, upgrades to energy transmission infrastructure and the development of renewable energy resources. Governments are now using international development as a foreign policy tool to help developing nations to overcome numerous challenges, including challenges related to water accessibility and human health.

The Tetra Tech Strategy

              To continue our successful growth and maintain a competitive position, we have implemented the following strategy that is integral to our future success:

              Start with Science.    We typically start with science at the onset of a project, building on our staff's strong technical and interdisciplinary expertise in natural and physical sciences. This strength allows us to effectively evaluate and recommend potential solutions to our clients' problems. We can support our clients through the entire project life cycle by providing consulting, engineering, construction management, operations and maintenance, and information technology services. We offer these services individually or as part of our full-service approach.

              Capitalize on our Extensive Technical and Multi-Disciplinary Experience.    Since our inception, we have provided innovative consulting and engineering services, focusing on cost-effective solutions to all aspects of water resource management. We have been successful in leveraging this foundation of scientific and engineering capabilities into other market areas, including an expanding base on commercial and industrial clients. Our services are provided by a wide range of professionals, including archaeologists, architects, biologists, chemical engineers, chemists, civil engineers, computer scientists, economists, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, oceanographers, project managers and toxicologists. Because of the experience that we have gained from thousands of completed projects, we have relevant expertise to draw from, and are often able to adapt and apply proven solutions to our clients' problems.

              Global Coverage and Local Delivery.    We believe that proximity to our clients is instrumental to understanding their needs and delivering comprehensive services. We have significantly broadened our geographic presence in recent years through strategic acquisitions and internal growth. We currently have North American operations throughout the United States and Canada. We have also increased our international presence with regional offices in Australia, Europe, Asia, South America, Africa and the Middle East. Our base of operations in North America and network of international offices provide a platform from which we can respond to the global need for essential water, environment, and energy services and help foster economic development. Over the past year, we worked in 113 countries, helping federal and local government agencies, the private sector and development assistance entities address

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complex water, environment, energy and related infrastructure needs in an environmentally responsible manner.

              Leverage Existing Client Base.    We believe that we can effectively expand our service offerings to existing clients, resulting in more comprehensive and interdisciplinary projects. We have regularly been able to secure design and program management contracts after having supported clients in the scientific evaluation and engineering phases of a project. By expanding our role with existing clients, we can address larger problems and provide integrated solutions. For our global clients, we also focus on expanding from localized geographic areas to provide broader national and international support in multiple locations.

              Identify and Expand into New Business Areas.    We use our consulting services and specialized technical services as entry points to evaluate adjacent business areas. After our consulting practice is established in a new business area, we can expand our operations by offering additional technical services. For example, based on our work in watershed management consulting, we identify adjacent opportunities and expand into water infrastructure and engineering services.

              Focus on Large, Complex and Interdisciplinary Projects.    We continue to focus on expanding our public and private sector services and bidding for complex projects that are at the leading edge of policy and technology development. We develop integrated, sustainable solutions by combining our interdisciplinary capabilities in water, environment, energy, infrastructure and natural resources. Our combination of technical expertise with practical applications provides challenging and rewarding opportunities for our employees, thereby enhancing our ability to recruit and retain top quality talent.

              Focus on Cash Generation.    We take a disciplined approach to monitoring, managing and improving our return on investment in each of our business areas through our efforts to negotiate appropriate contract terms, manage our contract performance to minimize schedule delays and cost overruns, and promptly bill and collect accounts receivable.

              Actively Attract, Recruit and Retain Strategic Hires.    We focus on attracting and retaining top-quality individuals who provide technical skills, innovative thinking, teamwork and dedication to maintaining long-term client relationships. Our full-service capabilities, internal networking programs, entrepreneurial environment, focus on technical excellence and global project portfolio help to attract and retain highly qualified individuals who support our long-term growth.

              Develop and Maintain Strategic Partnerships with Small Business Companies and Communities.    In working with suppliers, we are committed to being an excellent partner and mentor, consistent with our desire to lead with science and develop approaches to best serve our global clients. When combined with our considerable capabilities and expertise, value-added partnerships with external companies and suppliers can enhance the services we provide to our clients. We have established a Small Business and Partnerships Council to identify and promote the most successful partnerships and to coordinate best practices across our company.

              Invest in Strategic Acquisitions.    We believe that strategic acquisitions will allow us to continue our growth in selected business areas, broaden our service offerings and extend our geographic presence. We intend to continue to acquire companies that will help establish our position in certain emerging business areas or further strengthen our position in our more established businesses. Our effective integration of acquired companies can continue to enhance our ability to compete technically and geographically.

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Reportable Segments

              In fiscal 2013, we managed our business under three reportable segments. The following table presents the percentage of our revenue by reportable segment:

              In the first quarter of fiscal 2013, we implemented a reorganization of our operations to improve future growth and profitability, including the consolidation and realignment of certain operating activities to achieve efficiencies in our segment management. This reorganization included the elimination of the Engineering and Architecture Services ("EAS") reportable segment, and the re-assignment of its operations to the Engineering and Consulting Services and Technical Support Services segments. Prior year amounts have been reclassified to conform to the current-year presentation.

              For additional information regarding our reorganization and our reportable segments, see Note 18, "Reportable Segments" of the "Notes to Consolidated Financial Statements" included in Item 8. For more information on risks related to our business, segments and geographic regions, including risks related to foreign operations, see Item 1A, "Risk Factors" of this report.

Engineering and Consulting Services ("ECS")

              ECS provides front-end science, consulting engineering and project management services in the areas of surface water management, water infrastructure, solid waste management, mining, geotechnical sciences, arctic engineering, industrial processes and oil sands, transportation and information technology.

              Surface Water Management.    Public concern with the quality of rivers, lakes, streams, and coastal and marine waters, and the ensuing legislative and regulatory response, is driving demand for our services. More recently, two important factors have raised the visibility of the need for surface water management: competition for water resources and climate variations, such as those that cause increasingly severe droughts and floods. Over the past 40 years, we have developed a specialized set of technical skills that position us to compete effectively for surface water and watershed management projects. We provide water resource services to U.S. federal and Canadian provincial government clients such as the U.S. Environmental Protection Agency ("EPA"), the U.S. Department of Defense ("DoD"), the U.S. Department of Energy ("DOE") and the Alberta Ministry of Environment. We also provide these services to a broad base of commercial clients, including those in the aerospace, chemical, alternative energy, mining, oil and gas, pharmaceutical, retail and utility industries. Further, we provide surface water modeling services to municipal government agencies in the United States and Canada, particularly in the areas of watershed management, climate adaptation analysis, flood control, and the optimal management of stormwater and combined sewer overflow systems.

              Water Infrastructure.    Our design and technical services are applied to numerous aspects of water quality and quantity management, including major water and wastewater treatment plants, combined sewer storage and separation, and drainage and flood control. Our experience includes planning, permitting, design and construction management services for water treatment facilities, desalination facilities and water distribution systems, including pipelines and pump stations. We also support planning, permitting,

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design and construction of water-related redevelopment projects, and parks and river corridor restoration projects.

              Solid Waste Management.    We provide a wide range of engineering and consulting services for solid waste management, including landfill design and management. We also provide full-service solutions for gas-to-energy facilities using landfill methane gas. These services are performed throughout the United States and Canada.

              Mining.    We offer a full range of services for mining projects worldwide, including resource assessment, mine development, operations support and closure/remediation. Our full-service mining services team includes geologists, metallurgists, mine engineers, environmental scientists and water specialists. We address tough challenges in engineering design, procurement and construction to support all areas of mine operations, including underground and open pit operations, surface infrastructure, mills and process plants, power generation and transmission projects, water treatment, tailings management and regulatory compliance.

              Geotechnical Services.    Our geotechnical practice includes geotechnical engineers, soils technicians and drillers who investigate, analyze and develop geotechnical engineering recommendations for all types of soil and rock conditions. We have specialized capabilities to evaluate, monitor and design foundations and materials for roads, bridges, levees, flood walls and buildings located in extremely poor soil conditions, including conditions common to coastal regions.

              Arctic Engineering.    We provide consulting and construction services to owners of transportation, mining, energy and community infrastructure in the circumpolar region, which includes the Arctic and areas of permafrost around the globe. In this extreme environment where temperatures can drop below -50 °C (-58 °F), we provide adaptive engineering and scientific services that reach beyond traditional approaches. We are one of the few firms that are capable of providing full life-cycle services for northern development. We offer these arctic engineering services during all project phases: exploration and project planning; feasibility studies, design and permitting; engineering, procurement and construction management ("EPCM"), and construction; and operation, decommissioning and reclamation.

              Industrial Processes and Oil Sands.    We offer plant engineering services for clients in heavy industry, including mining and metals, and oil sands, as well as for those in the chemical and petrochemical industries. We have supported the industrial processes needs of clients with expertise in the production of base, rare, ferrous and agricultural minerals. We help renovate, upgrade and modernize industrial facilities, including concentrators, smelters and refineries. We provide significant services to major clients in the oil sands region of northern Alberta, Canada, including the management of tailings treatment and recovery. We also provide plant engineering, project execution, program management and full EPCM services for industrial process projects throughout North America.

              Transportation.    We provide engineering, architecture, construction management and technical services for transportation projects that improve public safety and mobility. Our transportation projects include roadway monitoring and improvements, commuter railway stations, airport expansions, bridges and major highways. We provide design solutions to repair, replace and upgrade older transportation infrastructure.

              Information Technology.    We provide technology systems integration to support data management, data processing, communications and outreach, and systems development. Our projects range from large-scale environmental monitoring, modeling and data management to systems engineering and design for major infrastructure rehabilitation programs. We provide systems analysis and information management to optimize the U.S. National Airspace System and related aviation systems. We also support

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research and technical services for national-scale water resource and environmental data management, including archiving and statistical analysis.

Technical Support Services ("TSS")

              TSS provides management consulting and engineering services and strategic direction in the areas of environmental assessments/hazardous waste management, climate change, international development, international reconstruction and stabilization, energy, oil and gas, technical government consulting, and building and facilities.

              Environmental Assessments/Hazardous Waste Management.    We provide comprehensive services for environmental planning, cleanup and reuse of sites contaminated with hazardous materials, toxic chemicals, and oil and petroleum products. Our services cover all phases of the remedial planning process, starting with emergency response and initial site assessment through removal actions, remedial design and implementation management. Sites range from small properties undergoing voluntary cleanup, to brownfields redevelopment projects, to DoD installations, to some of the largest and most complex Superfund sites in the United States. We support both commercial and government clients in planning and implementing remedial activities at numerous sites around the world. We also provide a broad range of environmental analysis and planning services to ensure that our clients are implementing their operations in a sustainable manner. Our services include air quality management, regulatory compliance, information management and geographic information systems, radiation protection and health physics, risk management, pollution prevention and control, radioactive and hazardous waste management, National Environmental Policy Act services and environmental response training.

              Climate Change.    In a resource-constrained world, our experts assist clients in identifying, reducing and strategically managing their environmental footprint to provide cost savings, mitigate regulatory impacts, institute operational efficiencies, develop new business opportunities and promote corporate responsibility. Our services support our clients' efforts to become sustainable by "greening" energy supplies, implementing energy efficiency and resource conservation, using alternative fuels, capturing and sequestering carbon, improving land and forest resource management, and purchasing carbon offsets. We have demonstrated that clients can concurrently reduce their carbon emissions and environmental impacts while saving money. Our services include climate change and strategic management consulting, project implementation, and greenhouse gas inventory assessment, certification, reduction and management.

              International Development.    We provide services to many donor agencies such as the U.S. Agency for International Development ("USAID"), the World Bank, the Asian Development Bank and the United Kingdom Department for International Development to develop safe and reliable water supplies and sanitation services, support the eradication of poverty, improve livelihoods, promote democracy and increase economic growth. We plan, design, implement, research and monitor projects in the broad 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. We build capacity and strengthen institutions in areas such as global health, energy sector reform, utility management, food security and local governance. We currently provide international development services in numerous countries around the world, working for the U.S. Department of State ("DoS"), USAID, the Millennium Challenge Corporation ("MCC") and the DoD.

              International Reconstruction and Stabilization.    We provide integral support to the DoS and USAID in reconstruction and stabilization worldwide, including the design, development, implementation and evaluation of these efforts. We also help develop training programs and curricula for "whole of government" reconstruction and stabilization training offered through the Foreign Service Institute. We

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helped develop the Interagency Conflict Assessment Framework, the tool now used by the U.S. government to assess and develop solutions in conflict-prone environments. Our experts have worked on these issues in such countries as the Republic of Georgia, South Sudan, Kosovo, Haiti, Bangladesh, Nepal and the Democratic Republic of Congo. We support the DoS by providing subject matter experts in areas such as energy, criminal justice and drug interdiction.

              Energy.    We provide a full range of services to electric power utilities and independent power producers worldwide, ranging from macro-level planning, management and advisory services to project-specific environmental, engineering and construction services. For utilities and governmental agencies regulating power, we provide policy and regulatory development, utility management and privatization, power asset evaluation and management, and transaction support services. For energy developers and owners of renewable and conventional power generation facilities, as well as transmission and distribution assets, we provide environmental, engineering, procurement, and operations and maintenance services for all project phases. Our projects range from onshore and offshore wind facilities and solar farms to liquefied natural gas facilities.

              Oil and Gas.    We support oil and gas clients in the upstream, midstream and downstream market sectors. Our services include environmental support, siting studies, strategic planning and analyses, design of well pads and surface impoundments for drilling sites, water management for exploration activities, design of midstream pipelines and associated pumping stations and storage facilities, construction monitoring, biological and cultural assessments, site investigations and hazardous waste site remediation.

              Technical Government Consulting.    We provide a broad spectrum of professional and technical services, including advisory and assistance services, to supplement and support the internal staff of our U.S. federal government clients. Our service offerings include facility planning and operational support, infrastructure development and management, human resource management, program and logistics management, engineering, test and evaluation, information technology, and administrative support. We provide senior advisors and subject matter experts to a diverse array of clients including the DoS, U.S. National Guard Bureaus, the Missile Defense Agency and the MCC in such areas as political-military affairs, public diplomacy and strategic communication, strategic planning, and measurement and evaluation.

              Buildings and Facilities.    We provide planning, architectural and engineering services for U.S. federal, state and local government and commercial facilities including military housing, educational, institutional, corporate headquarters, healthcare and research facilities. We specialize in designing high-performance, sustainable facilities that minimize environmental impacts, typically by minimizing water and power usage. Many of these green buildings include integrated interior systems for heat, light, security and communications, and may ultimately achieve Leadership in Energy and Environmental Design certification. Our projects include high-rise office buildings, museums, hotels, parks, visitor centers, marinas, and entertainment and leisure facilities. We have provided civil, electrical, mechanical, structural, plumbing and fire protection engineering and design services for high-profile buildings around the world. We have completed engineering and construction management projects for a wide range of clients with specialized needs such as security systems, training and audiovisual facilities, clean rooms, laboratories, medical facilities and emergency preparedness facilities.

Remediation and Construction Management ("RCM")

              RCM provides full-service support, including construction and construction management, to all of our client sectors, including the U.S. federal government in the United States and internationally, and commercial clients worldwide, in the areas of environmental remediation, infrastructure development, solid waste management, energy, and oil and gas.

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              Environmental Remediation.    We provide environmental remediation and reconstruction services to evaluate and restore lands to beneficial use. Under the U.S. federal government's Base Realignment and Closure ("BRAC") Act, we help remediate and restore facilities at military locations in the United States and around the world. We also manage large, complex sediment remediation programs that help restore rivers and coastal waters to beneficial use. Environmental remediation also includes activities to identify, evaluate and destroy unexploded ordinance (UXO), both domestically and internationally.

              Infrastructure Development.    We provide program management, construction management, and development services for large-scale water management infrastructure, including flood protection structures, water conveyance and treatment facilities, and hydroelectric power projects. For the mining industry we build processing plants, facilities, and supporting infrastructure. We also support our clients in developing a wide range of transportation-related structures and interconnections, including roads, bridges, aviation/runways, and ports and harbor facilities. We provide environmental, engineering, procurement, construction, and operations and maintenance services for all project phases.

              Solid Waste Management.    We provide program management, construction management, development and maintenance services for solid waste management systems including landfills and hazardous waste disposal. We provide design, construction management, and maintenance services to manage solid and hazardous waste, for environmental, wastewater, energy, oil and gas containment, mining, utilities, aquaculture, and other industrial clients. We design and install geosynthetic liners for large lining and capping projects, as well as innovative renewable energy projects such as solar energy-generating landfill caps. We also provide full-service solutions for gas-to-energy facilities to efficiently use landfill methane gas.

              Energy.    We provide full range of services for alternative and conventional energy development. For wind, solar and hydroelectric power development and upgrade projects, we provide environmental, engineering, procurement, construction, and operations and maintenance services for all project phases. We provide construction management, construction and electrical services to bring projects to completion. We provide retrofit, rehabilitation and renovation to aging conventional power plants, as well as decontamination and decommissioning. We also provide full-range services for other energy technologies including hydropower, geothermal, nuclear and biogeneration technologies.

              Oil and Gas.    We provide safe, reliable services from initial site conception, preparation and permitting to engineering, construction and start-up. We support the upstream, midstream and downstream components of the oil and gas industry including project controls, estimating, constructability, engineering, procurement, construction, construction management, equipment and material management.

Project Examples

              The following table presents brief examples of projects in our three segments during fiscal 2013:

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Clients

              We provide services to a diverse base of international, U.S. commercial, U.S. federal and U.S. state and local government clients. The following table presents the percentage of our revenue by client sector:

              U.S. federal government agencies are significant clients. The DoD accounted for 12.1%, 14.4% and 20.4% of our revenue in fiscal 2013, 2012 and 2011, respectively. We typically support multiple programs within a single U.S. federal government agency, both domestically and internationally. We also assist U.S. state and local government clients in a variety of jurisdictions across the United States. In Canada, we work for several provinces and a variety of local jurisdictions. Our commercial clients include companies in the chemical, energy, mining, pharmaceutical, retail, aerospace, automotive, petroleum and communications industries. No single client, except for U.S. federal government clients, accounted for more than 10% of our revenue in fiscal 2013.

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              The following table presents a list of representative clients in fiscal 2013 in our reportable segments.

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Contracts

              Our services are performed under three principal types of contracts with our clients: fixed-price, time-and-materials, and cost-plus. The following table presents the percentage of our revenue by contract type:

              Our clients select the type of contract we enter into for a particular engagement. Under a fixed-price contract, the client agrees to pay a specified price for our performance of the entire contract or a specified portion of the contract. Some fixed-price contracts can include date-certain and/or performance obligations. Fixed-price contracts carry certain inherent risks, including risks of losses from underestimating costs, delays in project completion, problems with new technologies, price increases for materials, and economic and other changes that may occur over the contract period. Consequently, the profitability of fixed-price contracts may vary substantially. Under our time-and-materials contracts, we are paid for labor at negotiated hourly billing rates and also paid for other expenses. Profitability on these contracts is driven by billable headcount and cost control. Many of our time-and-materials contracts are subject to maximum contract values and, accordingly, revenue related to these contracts is recognized as if these contracts were fixed-price contracts. Under our cost-plus contracts, some of which are subject to contract ceiling amount, we are reimbursed for allowable costs and fees, which may be fixed or

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performance-based. If our costs exceed the contract ceiling or are not allowable, we may not be able to obtain full reimbursement. Further, the amount of the fee received for a cost-plus award fee contract partially depends upon the client's discretionary periodic assessment of our performance on that contract.

              Some contracts with the U.S. federal government are subject to annual funding approval. U.S. federal government agencies may impose spending restrictions that limit the continued funding of our existing contracts and may limit our ability to obtain additional contracts. These limitations, if significant, could have a material adverse effect on us. All contracts with the U.S. federal government may be terminated by the government at any time, with or without cause.

              U.S. federal government agencies have formal policies against continuing or awarding contracts that would create actual or potential conflicts of interest with other activities of a contractor. These policies may prevent us from bidding for or performing government contracts resulting from or related to certain work we have performed. In addition, services performed for a commercial or government sector client may create conflicts of interest that preclude or limit our ability to obtain work for a private organization. We attempt to identify actual or potential conflicts of interest and to minimize the possibility that such conflicts could affect our work under current contracts or our ability to compete for future contracts. We have, on occasion, declined to bid on a project because of an existing or potential conflict of interest.

              Some of our operating units have contracts with the U.S. federal government that are subject to audit by the government, primarily by the Defense Contract Audit Agency ("DCAA"). The DCAA generally seeks to (i) identify and evaluate all activities that contribute to, or have an impact on, proposed or incurred costs of government contracts; (ii) evaluate a contractor's policies, procedures, controls and performance; and (iii) prevent or avoid wasteful, careless and inefficient production or service. To accomplish this, the DCAA examines our internal control systems, management policies and financial capability; evaluates the accuracy, reliability and reasonableness of our cost representations and records; and assesses our compliance with Cost Accounting Standards ("CAS") and defective-pricing clauses found within the Federal Acquisition Regulation ("FAR"). The DCAA also performs an annual review of our overhead rates and assists in the establishment of our final rates. This review focuses on the allowability of cost items and the applicability of CAS. The DCAA also audits cost-based contracts, including the close-out of those contracts.

              The DCAA reviews all types of U.S. 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. Operational audits are also performed by the DCAA. A review of our operations at every major organizational level is conducted during the proposal review period. During the course of its audit, the U.S. federal government may disallow costs if it determines that we accounted for such costs in a manner inconsistent with CAS. Under a government contract, only those costs that are reasonable, allocable and allowable are recoverable. A disallowance of costs by the U.S. federal government could have a material adverse effect on our financial results.

              In accordance with our corporate policies, we maintain controls to minimize any occurrence of fraud or other unlawful activities that could result in severe legal remedies, including the payment of damages and/or penalties, criminal and civil sanctions, and debarment. In addition, we maintain preventative audit programs and mitigation measures to ensure that appropriate control systems are in place.

              We provide our services under contracts, purchase orders or retainer letters. Our policy requires that all contracts must be in writing. We bill our clients in accordance with the contract terms and periodically based on costs incurred, on either an hourly-fee basis or on a percentage-of-completion basis, as the project progresses. Most of our agreements permit our clients to terminate the agreements without cause upon payment of fees and expenses through the date of the termination. Generally, our contracts do

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not require that we provide performance bonds. If required, a performance bond, issued by a surety company, guarantees a contractor's performance under the contract. If the contractor defaults under the contract, the surety will, at its discretion, complete the job or pay the client the amount of the bond. If the contractor does not have a performance bond and defaults in the performance of a contract, the contractor is responsible for all damages resulting from the breach of contract. These damages include the cost of completion, together with possible consequential damages such as lost profits.

Marketing and Business Development

              Our corporate management team establishes the scope and range of services we provide and our overall business strategy. Our annual strategic planning defines and guides our investment in marketing and business development toward priority programs and growth markets. Our centralized business development support group develops corporate marketing materials, conducts market research, and manages promotional and professional activities, including appearances at trade shows, direct mailings, advertising and public relations.

              Business development activities are implemented by our technical and professional management staff throughout the company. We believe that these personnel have the best understanding of a client's needs and the effect of local or client-specific issues, laws and regulations and procurement procedures. Our professional staff members hold frequent meetings with existing and potential clients; give presentations to civic and professional organizations; and present seminars on current technical topics. Essential to the effective development of business is each staff member's access to all of our service offerings through our internal technical and geographic networks. Our strong internal networking programs help our professional staff members to pursue new opportunities for both existing and new clients. These networks also facilitate our ability to provide services throughout the project life cycle from the early studies through to construction management and operations. Our information technology systems provide the support for a variety of data needs including skills search tools, business development tracking, and collaboration.

              For our major focus areas, consistent with our strategic plan, we have established company-wide growth initiatives that reinforce internal coordination, track the development of new programs, identify and coordinate collective resources for major bids, and help us build interdisciplinary teams for major pursuits. Our growth initiatives provide a forum for cross-sector collaboration and the development of interdisciplinary solutions. We continuously identify new markets that are consistent with our strategic plan and service offerings, and we leverage our full-service capabilities and internal coordination structure to develop and implement strategies to research, anticipate and position for future procurements and emerging programs.

Sustainability Program

              Our Sustainability Program allows us to encourage, coordinate and report on actions to minimize our collective impacts on the environment. Our Sustainability Program has three primary pillars: Projects – the solutions we provide for our clients; Procurement – our procurement and subcontracting approaches; and Processes – the internal policies and processes that promote sustainable practices, reduce costs and minimize environmental impacts. We have established a clear set of metrics to evaluate our progress toward our sustainability goals. We continuously implement sustainability-related policies and practices, and we assess the results of our efforts in order to improve upon them in the future.

              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. Our executive management team reviews and approves the Sustainability Program

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and evaluates our progress in achieving the goals and objectives outlined in our plan. We publish an annual sustainability report that documents our progress.

Acquisitions

              We continuously evaluate the marketplace for strategic acquisition opportunities. Due to our reputation, size, financial resources, geographic presence and range of services, we have numerous opportunities to acquire privately and publicly held companies or selected portions of such companies. During our evaluation, we examine the effect an acquisition may have on our long-range business strategy and results of operations. Generally, we proceed with an acquisition if we believe that it would have a positive effect on future operations and could strategically expand our service offerings. Successful integration and implementation are essential to achieving favorable results. Accordingly, no assurance can be given that any acquisition will provide accretive results.

              Our strategy is to position ourselves to address existing and emerging markets. We view acquisitions as a key component of our growth strategy, and we intend to use cash, debt or securities, as we deem appropriate, to fund acquisitions. We may acquire other businesses that we believe are synergistic and will ultimately increase our revenue and net income, strengthen our ability to achieve our strategic goals, provide critical mass with existing clients and further expand our lines of service. We typically pay a purchase price that results in the recognition of goodwill, generally representing the intangible value of a successful business with an assembled workforce specialized in our areas of interest. Acquisitions are inherently risky, and no assurance can be given that our previous or future acquisitions will be successful or will not have a material adverse effect on our financial position, results of operations or cash flow. All acquisitions require the approval of our Board of Directors, and those in excess of a certain size require the approval of our lenders.

              For detailed information regarding acquisitions, see Note 5, "Mergers and Acquisitions" of the "Notes to Consolidated Financial Statements" included in Item 8.

Competition

              The market for our services is generally competitive. We often compete with many other firms ranging from small regional firms to large international firms.

              We perform a broad spectrum of consulting, engineering and technical services across our reportable segments. Our client base includes U.S. federal government agencies such as the DoD, USAID, DOE, EPA and FAA; U.S. state and local government agencies; provincial and local government agencies in Canada; the U.S. commercial sector, which consists primarily of large industrial companies and utilities; and our international commercial clients, which are predominantly located in Canada and include primarily mining and oil and gas companies. Our competition varies and is a function of the business areas in which, and the client sectors for which, we perform our services. The number of competitors for any procurement can vary widely, depending upon technical qualifications, the relative value of the project, geographic location, the financial terms and risks associated with the work, and any restrictions placed upon competition by the client. Historically, clients have chosen among competing firms by weighing the quality, innovation and timeliness of the firm's service versus its cost to determine which firm offers the best value. When less work becomes available in a given market, price becomes an increasingly important factor.

              We believe that our principal competitors include the following firms, in alphabetical order: AECOM Technology Corporation; AMEC PLC; Arcadis NV; Black & Veatch Corporation; Brown & Caldwell; CDM Smith Inc.; CH2M HILL Companies, Ltd.; Chemonics International, Inc.; Dessau Inc.; Foster Wheeler AG; GENIVAR Inc.; GHD; ICF International,Inc.; Jacobs Engineering Group Inc.;

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Leidos, Inc., Michael Baker International, LLC; MWH Global, Inc.; Sinclair Knight Merz Pty Ltd.; SNC-Lavalin Group Inc.; Stantec Inc.; TRC Companies, Inc.; URS Corporation; Weston Solutions, Inc.; and Willbros Group, Inc.

Backlog

              We include in our backlog only those contracts for which funding has been provided and work authorization has been received. We estimate that approximately 70% of our backlog at the end of fiscal 2013 will be recognized as revenue in fiscal 2014, 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. In addition, project cancellations or scope adjustments may occur with respect to contracts reflected in our backlog. For example, certain of our contracts with the U.S. federal government and other clients are terminable at the discretion of the client, with or without cause. These types of backlog reductions could adversely affect our revenue and margins. Accordingly, our backlog as of any particular date is an uncertain indicator of our future earnings.

              At fiscal 2013 year-end, our backlog was $1.9 billion, a decrease of $225.7 million, or 10.6%, compared to last year-end. We experienced a broad-based decline in our backlog across all client sectors due to the volatility of current economic conditions, and increased ambiguity as to whether the U.S. or the global economy will grow modestly or remain stagnant. These conditions have been, and could continue to be, negatively impacted by mandatory federal budget reductions, or sequestrations, that became effective in our fiscal second quarter. In addition, the concerns over the economic challenges appear to be restraining business owners from making the significant investment commitments needed to fund future growth. As a result, our backlog was negatively impacted by the current economic conditions, including budget uncertainties, the effect of sequestration, and reduced customer spending. The overall decline was partially mitigated by the growth in our oil and gas business due to our continued expansion in North America.

Regulations

              We engage in various service activities that are subject to government oversight, including environmental laws and regulations, general government procurement laws and regulations, and other regulations and requirements imposed by specific government agencies with which we conduct business.

              Environmental.    A significant portion of our business involves planning, design, program management and construction management of pollution control facilities, as well as assessment and management of remediation activities at hazardous waste or U.S. Superfund sites and military bases. In addition, we contract with U.S. federal government entities to destroy hazardous materials, including weapons stockpiles. These activities require us to manage, handle, remove, treat, transport and dispose of toxic or hazardous substances.

              Some environmental laws, such as the Superfund law and similar state and local statutes, can impose liability for the entire cost of clean-up for contaminated facilities or sites upon present and former owners and operators, as well as generators, transporters and persons arranging for the treatment or disposal of such substances. In addition, while we strive to handle hazardous and toxic substances with care and in accordance with safe methods, the possibility of accidents, leaks, spills and the events of force majeure always exist. Humans exposed to these materials, including workers or subcontractors engaged in the transportation and disposal of hazardous materials and persons in affected areas, may be injured or become ill, resulting in lawsuits that expose us to liability that may result in substantial damage awards. Liabilities for contamination or human exposure to hazardous or toxic materials, or a failure to comply with applicable regulations, could result in substantial costs, including clean-up costs, fines, civil or criminal sanctions, third party claims for property damage or personal injury, or cessation of remediation activities.

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              Certain of our business operations are covered by U.S. Public Law 85-804, which provides for government indemnification against claims and damages arising out of unusually hazardous activities performed at the request of the government. Due to changes in public policies and law, however, government indemnification may not be available in the case of any future claims or liabilities relating to other hazardous activities that we perform.

              Government Procurement.    The services we provide to the U.S. federal government are subject to FAR and other rules and regulations applicable to government contracts. These rules and regulations:

•

require certification and disclosure of all cost and pricing data in connection with the contract negotiations under certain contract types;



•

impose accounting rules that define allowable and unallowable costs and otherwise govern our right to reimbursement under certain cost-based government contracts; and



•

restrict the use and dissemination of information classified for national security purposes and the exportation of certain products and technical data.

              In addition, services provided to the DoD are monitored by the Defense Contract Management Agency and audited by the DCAA. Our government clients can also terminate any of their contracts, and many of our government contracts are subject to renewal or extension annually. Further, the services we provide to state and local government clients are subject to various government rules and regulations.

Seasonality

              We experience seasonal trends in our business. Our revenue and operating income are typically lower in the first half of our fiscal year, primarily due to the Thanksgiving, Christmas and New Year's holidays. Many of our clients' employees, as well as our own employees, take vacations during these holiday periods. Further, seasonal inclement weather conditions occasionally cause some of our offices to close temporarily or may hamper our project field work. These occurrences result in fewer billable hours worked on projects and, correspondingly, less revenue recognized. Our revenue is typically higher in the second half of the fiscal year due to favorable weather conditions during spring and summer months that may result in higher billable hours. In addition, our revenue is typically higher in the fourth fiscal quarter due to the U.S. federal government's fiscal year-end spending.

Potential Liability and Insurance

              Our business activities could expose us to potential liability under various environmental laws and under workplace health and safety regulations. In addition, we occasionally assume liability by contract under indemnification agreements. We cannot predict the magnitude of such potential liabilities.

              We maintain a comprehensive general liability policy with an umbrella policy that covers losses beyond the general liability limits. We also maintain professional errors and omissions liability and contractor's pollution liability insurance policies. We believe that both policies provide adequate coverage for our business. When we perform higher-risk work, such as fixed-price remediation, we obtain the necessary types of insurance coverage for such activities, as is typically required by our clients.

              We obtain insurance coverage through a broker that is experienced in the professional liability field. The broker and our risk manager regularly review the adequacy of our insurance coverage. Because there are various exclusions and retentions under our policies, or an insurance carrier may become insolvent, there can be no assurance that all potential liabilities will be covered by our insurance policies or paid by our carrier.

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              We evaluate the risk associated with claims. If we determine that a loss is probable and reasonably estimable, we establish an appropriate reserve. A reserve is not established if we determine that a claim has no merit or is not probable or reasonably estimable. Our historic levels of insurance coverage and reserves have been adequate. However, partially or completely uninsured claims, if successful and of significant magnitude, could have a material adverse effect on our business.

Employees

              At fiscal 2013 year-end, we had more than 14,000 staff. A large percentage of our employees have technical and professional backgrounds and undergraduate and/or advanced degrees, including the employees of recently acquired companies. Our professional staff includes archaeologists, architects, biologists, chemical engineers, chemists, civil engineers, computer scientists, economists, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, oceanographers, project managers and toxicologists. Approximately 450 employees are represented by labor unions pursuant to collective bargaining agreements. We often employ union workers on a project-specific basis. We consider the current relationships with our employees including those represented by unions, to be favorable. We are not aware of any employment circumstances that are likely to disrupt work at any of our facilities. See Part I, Item 1A, "Risk Factors" for a discussion of the risks related to the loss of key personnel or our inability to attract and retain qualified personnel.

Executive Officers of the Registrant

              The following table shows the name, age and position of each of our executive officers at November 14, 2013:

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Available Information

              All of our periodic report filings with the Securities and Exchange Commission ("SEC") pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), are made available, free of charge, through our website located at www.tetratech.com, including our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to these reports. These reports are available on our website as soon as reasonably practicable after we electronically file with or furnish the reports to the SEC. You may also request an electronic or paper copy of these filings at no cost by writing or telephoning us at the following: Tetra Tech, Inc., Attention: Investor Relations, 3475 East Foothill Boulevard, Pasadena, California 91107, (626) 351-4664.

Item 1A.    Risk Factors

              We operate in a changing environment that involves numerous known and unknown risks and uncertainties that could materially adversely affect our operations. Set forth below and elsewhere in this report and in other documents we file with the SEC are descriptions of the risks and uncertainties that could cause our actual results to differ materially from the results contemplated by the forward-looking statements contained in this report. Additional risks we do not yet know of or that we currently think are immaterial may also affect our business operations. If any of the events or circumstances described in the following risks actually occurs, our business, financial condition or results of operations could be materially adversely affected.

Our operating results may be adversely impacted by worldwide political and economic uncertainties and specific conditions in the markets we address.

              General worldwide economic conditions have experienced a downturn due to the reduction of available credit, slower economic activity, concerns about inflation and deflation, increased energy and commodity costs, decreased consumer confidence and capital spending, adverse business conditions, and, in the United States, the negative impact on economic growth resulting from the combination of federal income tax increases and government spending restrictions. These conditions make it extremely difficult for our clients and our vendors to accurately forecast and plan future business activities and could cause businesses to slow spending on services, and they have also made it very difficult for us to predict the short-term and long-term impacts on our business. We cannot predict the timing, strength or duration of any economic slowdown or subsequent economic recovery worldwide or in our industry. If the economy or markets in which we operate deteriorate from the level experienced in fiscal 2013, our business, financial condition and results of operations may be materially and adversely affected.

The implementation of the March 1, 2013 budget sequester under the Budget Control Act of 2011 has produced significant uncertainty with respect to future government programs and funding, and could significantly reduce government spending for the services we provide.

              The Budget Control Act of 2011imposed U.S. federal government automatic across-the-board spending cuts, known as the "sequester," in fiscal year 2013 and beyond. Our work with agencies and departments of the U.S. federal government, as well as any state government agencies and departments that are funded directly or indirectly by the U.S. federal government, may be impacted by sequestration or as a result of any legislation implemented to end the sequester. Uncertainty among our government customer organizations over the timing and implementation of the sequester is likely to produce delays in the awards of future contracts. There are many variables in how the sequester will continue to be implemented that make it difficult to determine any specific consequences on our business in fiscal year 2014 and beyond, but the sequester could have a material adverse effect on our business, results of operations and financial condition.

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Our annual revenue, expenses and operating results may fluctuate significantly, which may adversely affect our stock price.

              Our annual revenue, expenses and operating results may fluctuate significantly because of numerous factors, some of which may contribute to more pronounced fluctuations in an uncertain global economic environment. These factors include:

•

general economic or political conditions;



•

unanticipated changes in contract performance that may affect profitability, particularly with contracts that are fixed-price or have funding limits;



•

contract negotiations on change orders, requests for equitable adjustment, and collections of related billed and unbilled accounts receivable;



•

seasonality of the spending cycle of our public sector clients, notably the U.S. federal government, the spending patterns of our commercial sector clients, and weather conditions;



•

budget constraints experienced by our U.S. federal, state and local government clients;



•

integration of acquired companies;



•

changes in contingent consideration related to acquisition earn-outs;



•

divestiture or discontinuance of operating units;



•

employee hiring, utilization and turnover rates;



•

loss of key employees;



•

the number and significance of client contracts commenced and completed during a quarter;



•

creditworthiness and solvency of clients;



•

the ability of our clients to terminate contracts without penalties;



•

delays incurred in connection with a contract;



•

the size, scope and payment terms of contracts;



•

the timing of expenses incurred for corporate initiatives;



•

reductions in the prices of services offered by our competitors;



•

threatened or pending litigation;



•

legislative and regulatory enforcement policy changes that may affect demand for our services;



•

the impairment of goodwill or identifiable intangible assets;



•

the fluctuation of a foreign currency exchange rate;

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•

stock-based compensation expense;



•

actual events, circumstances, outcomes and amounts differing from judgments, assumptions and estimates used in determining the value of certain assets (including the amounts of related valuation allowances), liabilities and other items reflected in our consolidated financial statements;



•

success in executing our strategy and operating plans;



•

changes in tax laws or regulations or accounting rules;



•

results of income tax examinations;



•

the timing of announcements in the public markets regarding new services or potential problems with the performance of services by us or our competitors, or any other material announcements;



•

speculation in the media and analyst community, changes in recommendations or earnings estimates by financial analysts, changes in investors' or analysts' valuation measures for our stock and market trends unrelated to our stock; and



•

continued volatility in the financial markets.

              As a consequence, operating results for a particular future period are difficult to predict and, therefore, prior results are not necessarily indicative of results to be expected in future periods. Any of the foregoing factors, or any other factors discussed elsewhere herein, could have a material adverse effect on our business, results of operations and financial condition that could adversely affect our stock price.

Demand for our services is cyclical and vulnerable to economic downturns. If economic growth slows, government fiscal conditions worsen, or client spending declines further, then our revenue, profits and our financial condition may deteriorate.

              Demand for our services is cyclical, and vulnerable to economic downturns and reductions in government and private industry spending, such as budget cuts related to federal sequestration. Such downturns or reductions may result in clients delaying, curtailing or canceling proposed and existing projects. Our business traditionally lags the overall recovery in the economy; therefore, our business may not recover immediately when the economy improves. If economic growth slows, government fiscal conditions worsen, or client spending declines further, then our revenue, profits and overall financial condition may deteriorate. Our government clients may face budget deficits that prohibit them from funding new or existing projects. In addition, our existing and potential clients may either postpone entering into new contracts or request price concessions. Difficult financing and economic conditions may cause some of our clients to demand better pricing terms or delay payments for services we perform, thereby increasing the average number of days our receivables are outstanding and the potential of increased credit losses of uncollectible invoices. Further, these conditions may result in the inability of some of our clients to pay us for services that we have already performed. If we are not able to reduce our costs quickly enough to respond to the revenue decline from these clients, our operating results may be adversely affected. Accordingly, these factors affect our ability to forecast our future revenue and earnings from business areas that may be adversely impacted by market conditions.

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We derive revenue from companies in the mining industry, which is a historically cyclical industry with levels of activity that are significantly affected by the levels and volatility of prices for commodities. If economic growth slows or global demand for commodities declines further, then our revenue, profits and our financial condition may deteriorate.

              The businesses of our global mining clients are, to varying degrees, cyclical and have experienced declines over the last year due to lower global growth expectations and the associated decline in market prices. For example, depending on the market prices of uranium, precious metals, aluminum, copper, iron ore and potash, our mining company clients may cancel or curtail their mining projects, which could result in a corresponding decline in the demand for our services among these clients. Accordingly, the cyclical nature of the mining market could have a material adverse effect on our business, operating results or financial condition.

Demand for our oil and gas services fluctuates.

              Demand for our oil and gas services fluctuates, and we depend on our customers' willingness to make future expenditures to explore for, develop, produce and transport oil and natural gas in the United States and Canada. For example, in the second quarter of 2013, our revenues were adversely affected by unusually severe flooding in Western Canada that disrupted activities at project sites. Our customers' willingness to undertake these activities depends largely upon prevailing industry conditions that are influenced by numerous factors over which we have no control, including:

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prices, and expectations about future prices, of oil and natural gas;



•

domestic and foreign supply of and demand for oil and natural gas;



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the cost of exploring for, developing, producing and delivering oil and natural gas;



•

available pipeline, storage and other transportation capacity;



•

availability of qualified personnel and lead times associated with acquiring equipment and products;



•

federal, state and local regulation of oilfield activities;



•

environmental concerns regarding the methods our customers use to produce hydrocarbons;



•

the availability of water resources and the cost of disposal and recycling services; and



•

seasonal limitations on access to work locations.

              Anticipated future prices for natural gas and crude oil are a primary factor affecting spending by our customers. Lower prices or volatility in prices for oil and natural gas typically decrease spending, which can cause rapid and material declines in demand for our services and in the prices we are able to charge for our services. In addition, should the proposed Keystone XL pipeline project application be denied or further delayed by the U.S. federal government, then there may be a slowing of spending in the development of the Canadian oil sands. Worldwide political, economic, military and terrorist events, as well as natural disasters and other factors beyond our control contribute to oil and natural gas price levels and volatility and are likely to continue to do so in the future.

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We derive a substantial amount of our revenue from U.S. federal, state and local government agencies, and any disruption in government funding or in our relationship with those agencies could adversely affect our business.

              In fiscal 2013, we generated 46.8% of our revenue from contracts with U.S. federal, state and local government agencies. U.S. federal government agencies are among our most significant clients. We generated 31.8% of our revenue for the fiscal 2013 from the following agencies: 12.1% from DoD agencies, 9.7% from USAID and 10.0% from other U.S. federal government agencies. A significant amount of this revenue is derived under multi-year contracts, many of which are appropriated on an annual basis. As a result, at the beginning of a project, the related contract may be only partially funded, and additional funding is normally committed only as appropriations are made in each subsequent year. These appropriations, and the timing of payment of appropriated amounts, may be influenced by numerous factors as noted below. Our backlog includes only the projects that have funding appropriated.

              The demand for our U.S. government-related services is generally driven by the level of government program funding. Accordingly, the success and further development of our business depends, in large part, upon the continued funding of these U.S. government programs, and upon our ability to obtain contracts and perform well under these programs. There are several factors that could materially affect our U.S. government contracting business, including the following:

•

the failure of the U.S. government to complete its budget process before its fiscal year-end, which results in the funding of government operations by means of a continuing resolution that authorizes agencies to continue to operate but does not authorize new spending initiatives. As a result, U.S. government agencies may delay the procurement of services;



•

changes in and delays or cancellations of government programs, requirements or appropriations;



•

budget constraints or policy changes resulting in delay or curtailment of expenditures related to the services we provide;



•

re-competes of government contracts;



•

the timing and amount of tax revenue received by federal, state and local governments, and the overall level of government expenditures;



•

curtailment in the use of government contracting firms;



•

delays associated with insufficient numbers of government staff to oversee contracts;



•

the increasing preference by government agencies for contracting with small and disadvantaged businesses;



•

competing political priorities and changes in the political climate with regard to the funding or operation of the services we provide;



•

the adoption of new laws or regulations affecting our contracting relationships with the federal, state or local governments;



•

unsatisfactory performance on government contracts by us or one of our subcontractors, negative government audits, or other events that may impair our relationship with the federal, state or local governments;

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a dispute with or improper activity by any of our subcontractors; and



•

general economic or political conditions.

              These and other factors could cause U.S. government agencies to delay or cancel programs, to reduce their orders under existing contracts, to exercise their rights to terminate contracts or not to exercise contract options for renewals or extensions. Any of these actions could have a material adverse effect on our revenue or timing of contract payments from these agencies.

As a U.S. government contractor, we must comply with various procurement laws and regulations and are subject to regular government audits; a violation of any of these laws and regulations or the failure to pass a government audit could result in sanctions, contract termination, forfeiture of profit, harm to our reputation or loss of our status as an eligible government contractor and could reduce our profits and revenue.

              We must comply with and are affected by U.S. federal, state, local and foreign laws and regulations relating to the formation, administration and performance of government contracts. For example, we must comply with FAR, the Truth in Negotiations Act, CAS, the American Recovery and Reinvestment Act of 2009, the Services Contract Act and DoD security regulations, as well as many other rules and regulations. In addition, we must also comply with other government regulations related to employment practices, environmental protection, health and safety, tax, accounting and anti-fraud measures, as well as many others regulations in order to maintain our government contractor status. These laws and regulations affect how we do business with our clients and, in some instances, impose additional costs on our business operations. Although we take precautions to prevent and deter fraud, misconduct and non-compliance, we face the risk that our employees or outside partners may engage in misconduct, fraud or other improper activities. U.S. government agencies, such as the DCAA, routinely audit and investigate government contractors. These government agencies review and audit a government contractor's performance under its contracts and cost structure, and evaluate compliance with applicable laws, regulations and standards. In addition, during the course of its audits, the DCAA may question our incurred project costs. If the DCAA believes we have accounted for such costs in a manner inconsistent with the requirements for FAR or CAS, the DCAA auditor may recommend to our U.S. government corporate administrative contracting officer to disallow such costs. Historically, we have not experienced significant disallowed costs as a result of government audits. However, we can provide no assurance that the DCAA or other government audits will not result in material disallowances for incurred costs in the future. In addition, U.S. government contracts are subject to various other requirements relating to the formation, administration, performance and accounting for these contracts. We may also be subject to qui tam litigation brought by private individuals on behalf of the U.S. government under the Federal Civil False Claims Act, which could include claims for treble damages. U.S. government contract violations could result in the imposition of civil and criminal penalties or sanctions, contract termination, forfeiture of profit and/or suspension of payment, any of which could make us lose our status as an eligible government contractor. We could also suffer serious harm to our reputation. Any interruption or termination of our U.S. government contractor status could reduce our profits and revenue significantly.

Our inability to win or renew U.S. government contracts during regulated procurement processes could harm our operations and significantly reduce or eliminate our profits.

              U.S. government contracts are awarded through a regulated procurement process. The U.S. federal government has increasingly relied upon multi-year contracts with pre-established terms and conditions, such as indefinite delivery/indefinite quantity ("IDIQ") contracts, which generally require those contractors who have previously been awarded the IDIQ to engage in an additional competitive bidding process before a task order is issued. As a result, new work awards tend to be smaller and of shorter duration, since the orders represent individual tasks rather than large, programmatic assignments.

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In addition, we believe that there has been an increase in the award of federal contracts based on a low-price, technically acceptable criteria emphasizing price over qualitative factors, such as past performance. As a result, pricing pressure may reduce our profit margins on future federal contracts. The increased competition and pricing pressure, in turn, may require us to make sustained efforts to reduce costs in order to realize revenue and profits under government contracts. If we are not successful in reducing the amount of costs we incur, our profitability on government contracts will be negatively impacted. In addition, the U.S. federal government has scaled back outsourcing of services in favor of "insourcing" jobs to its employees, which could reduce our revenue. Also, the Budget Control Act of 2011 imposed federal spending cuts mandated across the federal budget in fiscal year 2013 and beyond that have resulted in reductions in the funding for infrastructure, defense and other projects. Moreover, even if we are qualified to work on a government contract, we may not be awarded the contract because of existing government policies designed to protect small businesses and under-represented minority contractors. Our inability to win or renew government contracts during regulated procurement processes could harm our operations and significantly reduce or eliminate our profits.

Each year, client funding for some of our U.S. government contracts may rely on government appropriations or public-supported financing. If adequate public funding is delayed or is not available, then our profits and revenue could decline.

              Each year, client funding for some of our U.S. government contracts may directly or indirectly rely on government appropriations or public-supported financing. Legislatures may appropriate funds for a given project on a year-by-year basis, even though the project may take more than one year to perform. In addition, public-supported financing such as U.S. state and local municipal bonds may be only partially raised to support existing projects. The Budget Control Act of 2011 imposed federal spending cuts mandated across the federal budget in fiscal year 2013 and beyond that have resulted in reductions in the funding for infrastructure, defense and other projects. Similarly, the impact of the economic downturn on U.S. state and local governments may make it more difficult for them to fund projects. In addition to the state of the economy and competing political priorities, public funds and the timing of payment of these funds may be influenced by, among other things, curtailments in the use of government contracting firms, increases in raw material costs, delays associated with insufficient numbers of government staff to oversee contracts, budget constraints, the timing and amount of tax receipts and the overall level of government expenditures. If adequate public funding is not available or is delayed, then our profits and revenue could decline.

Our U.S. federal government contracts may give government agencies the right to modify, delay, curtail, renegotiate or terminate existing contracts at their convenience at any time prior to their completion, which may result in a decline in our profits and revenue.

              U.S. federal government projects in which we participate as a contractor or subcontractor may extend for several years. Generally, government contracts include the right to modify, delay, curtail, renegotiate or terminate contracts and subcontracts at the government's convenience any time prior to their completion. Any decision by a U.S. federal government client to modify, delay, curtail, renegotiate or terminate our contracts at their convenience may result in a decline in our profits and revenue.

Our revenue from commercial clients is significant, and the credit risks associated with certain of these clients could adversely affect our operating results.

              In fiscal 2013, we generated 49.1% of our revenue from U.S. and foreign commercial clients. Due to continuing weakness in general economic conditions, our commercial business may be at risk as we rely upon the financial stability and creditworthiness of our clients. To the extent the credit quality of these clients deteriorates or these clients seek bankruptcy protection, our ability to collect our receivables, and ultimately our operating results, may be adversely affected.

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Our international operations expose us to legal, political and economic risks that could harm our business and financial results.

              In fiscal 2013, we generated 26.7% of our revenue from our international operations, primarily in Canada, and from international clients for work that is performed by our domestic operations. International business is subject to a variety of risks, including:

•

potential non-compliance with a wide variety of laws and regulations, including anti-corruption and anti-boycott rules, trade and export control regulations, and other international regulations;



•

lack of developed legal systems to enforce contractual rights;



•

greater risk of uncollectible accounts and longer collection cycles;



•

currency exchange rate fluctuations, devaluations and other conversion restrictions;



•

uncertain and changing tax rules, regulations and rates;



•

the potential for civil unrest, acts of terrorism and greater physical security risks, which may cause us to leave a country quickly;



•

logistical and communication challenges;



•

imposition of governmental controls and potentially adverse changes in laws and regulatory practices, including tariffs and taxes;



•

changes in labor conditions;



•

general economic, political and financial conditions in foreign markets; and



•

exposure to civil or criminal liability under the U.S. Foreign Corrupt Practices Act ("FCPA"), the U.K. Bribery Act, the Canadian Corruption of Foreign Public Officials Act, the anti-boycott rules, trade and export control regulations, as well as other international regulations.

              For example, an on-going government investigation into political corruption in Quebec has contributed to the slow-down in procurements and business activity in that province, which has adversely affected our business. The Province of Quebec has adopted legislation that requires businesses and individuals seeking contracts with governmental bodies (including cities, towns, municipalities and the provincial government) be certified by a Quebec regulatory authority as deserving the trust of the public for contracts over a specified size. Our failure to obtain certification could adversely affect our business.

              International risks and violations of international regulations may significantly reduce our revenue and profits, and subject us to criminal or civil enforcement actions, including fines, suspensions or disqualification from future U.S. federal procurement contracting. Although we have policies and procedures to monitor legal and regulatory compliance, our employees, subcontractors and agents could take actions that violate these requirements. As a result, our international risk exposure may be more or less than the percentage of revenue attributed to our international operations.

We could be adversely affected by violations of the FCPA and similar worldwide anti-bribery laws.

              The FCPA and similar anti-bribery laws generally prohibit companies and their intermediaries from making improper payments to foreign government officials for the purpose of obtaining or retaining

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business. The U.K. Bribery Act of 2010 prohibits both domestic and international bribery, as well as bribery across both private and public sectors. In addition, an organization that "fails to prevent bribery" by anyone associated with the organization can be charged under the U.K. Bribery Act unless the organization can establish the defense of having implemented "adequate procedures" to prevent bribery. Practices in the local business community of many countries outside the United States have a level of government corruption that is greater than that found in the developed world. Our policies mandate compliance with these anti-bribery laws and we have established policies and procedures designed to monitor compliance with these anti-bribery law requirements; however, we cannot ensure that our policies and procedures will protect us from potential reckless or criminal acts committed by individual employees or agents. If we are found to be liable for anti-bribery law violations, we could suffer from criminal or civil penalties or other sanctions that could have a material adverse effect on our business.

We could be adversely impacted if we fail to comply with domestic and international export laws.

              To the extent we export technical services, data and products outside of the United States, we are subject to U.S. and international laws and regulations governing international trade and exports, including but not limited to the International Traffic in Arms Regulations, the Export Administration Regulations and trade sanctions against embargoed countries. A failure to comply with these laws and regulations could result in civil or criminal sanctions, including the imposition of fines, the denial of export privileges and suspension or debarment from participation in U.S. government contracts, which could have a material adverse effect on our business.

If we fail to complete a project in a timely manner, miss a required performance standard or otherwise fail to adequately perform on a project, then we may incur a loss on that project, which may reduce or eliminate our overall profitability.

              Our engagements often involve large-scale, complex projects. The quality of our performance on such projects depends in large part upon our ability to manage the relationship with our clients and our ability to effectively manage the project and deploy appropriate resources, including third-party contractors and our own personnel, in a timely manner. We may commit to a client that we will complete a project by a scheduled date. We may also commit that a project, when completed, will achieve specified performance standards. If the project is not completed by the scheduled date or fails to meet required performance standards, we may either incur significant additional costs or be held responsible for the costs incurred by the client to rectify damages due to late completion or failure to achieve the required performance standards. The uncertainty of the timing of a project can present difficulties in planning the amount of personnel needed for the project. If the project is delayed or canceled, we may bear the cost of an underutilized workforce that was dedicated to fulfilling the project. In addition, performance of projects can be affected by a number of factors beyond our control, including unavoidable delays from government inaction, public opposition, inability to obtain financing, weather conditions, unavailability of vendor materials, changes in the project scope of services requested by our clients, industrial accidents, environmental hazards, labor disruptions and other factors. To the extent these events occur, the total costs of the project could exceed our estimates, and we could experience reduced profits or, in some cases, incur a loss on a project, which may reduce or eliminate our overall profitability. Further, any defects or errors, or failures to meet our clients' expectations, could result in claims for damages against us. Failure to meet performance standards or complete performance on a timely basis could also adversely affect our reputation.

The loss of key personnel or our inability to attract and retain qualified personnel could impair our ability to provide services to our clients and otherwise conduct our business effectively.

              As primarily a professional and technical services company, we are labor-intensive and, therefore, our ability to attract, retain and expand our senior management and our professional and technical staff is

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an important factor in determining our future success. The market for qualified scientists and engineers is competitive and, from time to time, it may be difficult to attract and retain qualified individuals with the required expertise within the timeframe demanded by our clients. For example, some of our U.S. government contracts may require us to employ only individuals who have particular government security clearance levels. In addition, we rely heavily upon the expertise and leadership of our senior management. If we are unable to retain executives and other key personnel, the roles and responsibilities of those employees will need to be filled, which may require that we devote time and resources to identify, hire and integrate new employees. With limited exceptions, we do not have employment agreements with any of our key personnel. The loss of the services of any of these key personnel could adversely affect our business. Although we have obtained non-compete agreements from certain principals and stockholders of companies we have acquired, we generally do not have non-compete or employment agreements with key employees who were once equity holders of these companies. Further, many of our non-compete agreements have expired. We do not maintain key-man life insurance policies on any of our executive officers or senior managers. Our failure to attract and retain key individuals could impair our ability to provide services to our clients and conduct our business effectively.

Our actual business and financial results could differ from the estimates and assumptions that we use to prepare our financial statements, which may significantly reduce or eliminate our profits.

              To prepare financial statements in conformity with generally accepted accounting principles in the United States of America ("GAAP"), management is required to make estimates and assumptions as of the date of the financial statements. These estimates and assumptions affect the reported values of assets, liabilities, revenue and expenses, as well as disclosures of contingent assets and liabilities. For example, we typically recognize revenue over the life of a contract based on the proportion of costs incurred to date compared to the total costs estimated to be incurred for the entire project. Areas requiring significant estimates by our management include:

•

the application of the percentage-of-completion method of accounting and revenue recognition on contracts, change orders and contract claims including related unbilled accounts receivable;



•

unbilled accounts receivable including amounts related to requests for equitable adjustment to contracts that provide for price redetermination, primarily with the U.S. federal government. These amounts are recorded only when they can be reliably estimated and realization is probable;



•

provisions for uncollectible receivables, client claims and recoveries of costs from subcontractors, vendors and others;



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provisions for income taxes, research and experimentation ("R&E") credits, valuation allowances and unrecognized tax benefits;



•

value of goodwill and recoverability of other intangible assets;



•

valuations of assets acquired and liabilities assumed in connection with business combinations;



•

valuation of contingent earn-out liabilities recorded in connection with business combinations;



•

valuation of employee benefit plans;



•

valuation of stock-based compensation expense; and



•

accruals for estimated liabilities, including litigation and insurance reserves.

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              Our actual business and financial results could differ from those estimates, which may significantly reduce or eliminate our profits.

Our profitability could suffer if we are not able to maintain adequate utilization of our workforce.

              The cost of providing our services, including the extent to which we utilize our workforce, affects our profitability. The rate at which we utilize our workforce is affected by a number of factors, including:

•

our ability to transition employees from completed projects to new assignments and to hire and assimilate new employees;



•

our ability to forecast demand for our services and thereby maintain an appropriate headcount in each of our geographies and workforces;



•

our ability to manage attrition;



•

our need to devote time and resources to training, business development, professional development and other non-chargeable activities; and



•

our ability to match the skill sets of our employees to the needs of the marketplace.

              If we over-utilize our workforce, our employees may become disengaged, which will impact employee attrition. If we under-utilize our workforce, our profit margin and profitability could suffer.

Our use of the percentage-of-completion method of revenue recognition could result in a reduction or reversal of previously recorded revenue and profits.

              We account for most of our contracts on the percentage-of-completion method of revenue recognition. Generally, our use of this method results in recognition of revenue and profit ratably over the life of the contract, based on the proportion of costs incurred to date to total costs expected to be incurred for the entire project. The effects of revisions to revenue and estimated costs, including the achievement of award fees as well as the impact of change orders and claims, are recorded when the amounts are known and can be reasonably estimated. Such revisions could occur in any period and their effects could be material. Although we have historically made reasonably reliable estimates of the progress towards completion of long-term contracts, the uncertainties inherent in the estimating process make it possible for actual costs to vary materially from estimates, including reductions or reversals of previously recorded revenue and profit.

If we are unable to accurately estimate and control our contract costs, then we may incur losses on our contracts, which could decrease our operating margins and reduce our profits. In particular, our fixed-price contracts could increase the unpredictability of our earnings.

              It is important for us to accurately estimate and control our contract costs so that we can maintain positive operating margins and profitability. We generally enter into three principal types of contracts with our clients: fixed-price, time-and-materials and cost-plus.

              The U.S. federal government and some clients have increased the use of fixed-priced contracts. Under fixed-price contracts, we receive a fixed price irrespective of the actual costs we incur and, consequently, we are exposed to a number of risks. We realize a profit on fixed-price contracts only if we can control our costs and prevent cost over runs on our contracts. Fixed-price contracts require cost and scheduling estimates that are based on a number of assumptions, including those about future economic conditions, costs and availability of labor, equipment and materials, and other exigencies. We could

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experience cost overruns if these estimates are originally inaccurate as a result of errors or ambiguities in the contract specifications, or become inaccurate as a result of a change in circumstances following the submission of the estimate due to, among other things, unanticipated technical problems, difficulties in obtaining permits or approvals, changes in local laws or labor conditions, weather delays, changes in the costs of raw materials, or inability of our vendors or subcontractors to perform. If cost overruns occur, we could experience reduced profits or, in some cases, a loss for that project. If a project is significant, or if there are one or more common issues that impact multiple projects, costs overruns could increase the unpredictability of our earnings as well as have a material adverse impact on our business and earnings.

              Under our time-and-materials contracts, we are paid for labor at negotiated hourly billing rates and also paid for other expenses. Profitability on these contracts is driven by billable headcount and cost control. Many of our time-and-materials contracts are subject to maximum contract values and, accordingly, revenue relating to these contracts is recognized as if these contracts were fixed-price contracts. Under our cost-plus contracts, some of which are subject to contract ceiling amounts, we are reimbursed for allowable costs and fees, which may be fixed or performance-based. If our costs exceed the contract ceiling or are not allowable under the provisions of the contract or any applicable regulations, we may not be able to obtain reimbursement for all of the costs we incur.

              Profitability on our contracts is driven by billable headcount and our ability to manage our subcontractors, vendors and material suppliers. If we are unable to accurately estimate and manage our costs, we may incur losses on our contracts, which could decrease our operating margins and significantly reduce or eliminate our profits. Certain of our contracts require us to satisfy specific design, engineering, procurement or construction milestones in order to receive payment for the work completed or equipment or supplies procured prior to achievement of the applicable milestone. As a result, under these types of arrangements, we may incur significant costs or perform significant amounts of services prior to receipt of payment. If a client determines not to proceed with the completion of the project or if the client defaults on its payment obligations, we may face difficulties in collecting payment of amounts due to us for the costs previously incurred or for the amounts previously expended to purchase equipment or supplies.

              Accounting for a contract requires judgments relative to assessing the contract's estimated risks, revenue, costs and other technical issues. Due to the size and nature of many of our contracts, the estimation of overall risk, revenue and cost at completion is complicated and subject to many variables. Changes in underlying assumptions, circumstances or estimates may also adversely affect future period financial performance. If we are unable to accurately estimate the overall revenue or costs on a contract, then we may experience a lower profit or incur a loss on the contract.

Our failure to win new contracts and renew existing contracts with private and public sector clients could adversely affect our profitability.

              Our business depends on our ability to win new contracts and renew existing contracts with private and public sector clients. Contract proposals and negotiations are complex and frequently involve a lengthy bidding and selection process, which is affected by a number of factors. These factors include market conditions, financing arrangements and required governmental approvals. For example, a client may require us to provide a bond or letter of credit to protect the client should we fail to perform under the terms of the contract. If negative market conditions arise, or if we fail to secure adequate financial arrangements or the required government approval, we may not be able to pursue particular projects, which could adversely affect our profitability.

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We have made and expect to continue to make acquisitions that could disrupt our operations and adversely impact our business and operating results. Our failure to conduct due diligence effectively or our inability to successfully integrate acquisitions could impede us from realizing all of the benefits of the acquisitions, which could weaken our results of operations.

              A key part of our growth strategy is to acquire other companies that complement our lines of business or that broaden our technical capabilities and geographic presence. We expect to continue to acquire companies as an element of our growth strategy; however, our ability to make acquisitions is restricted under our Credit Agreement. Acquisitions involve certain known and unknown risks that could cause our actual growth or operating results to differ from our expectations or the expectations of securities analysts. For example:

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we may not be able to identify suitable acquisition candidates or to acquire additional companies on acceptable terms;



•

we are pursuing international acquisitions, which inherently pose more risk than domestic acquisitions;



•

we compete with others to acquire companies, which may result in decreased availability of, or increased price for, suitable acquisition candidates;



•

we may not be able to obtain the necessary financing, on favorable terms or at all, to finance any of our potential acquisitions;



•

we may ultimately fail to consummate an acquisition even if we announce that we plan to acquire a company; and



•

acquired companies may not perform as we expect, and we may fail to realize anticipated revenue and profits.

              In addition, our acquisition strategy may divert management's attention away from our existing businesses, resulting in the loss of key clients or key employees, and expose us to unanticipated problems or legal liabilities, including responsibility as a successor-in-interest for undisclosed or contingent liabilities of acquired businesses or assets.

              If we fail to conduct due diligence on our potential targets effectively, we may, for example, not identify problems at target companies or fail to recognize incompatibilities or other obstacles to successful integration. Our inability to successfully integrate future acquisitions could impede us from realizing all of the benefits of those acquisitions and could severely weaken our business operations. The integration process may disrupt our business and, if implemented ineffectively, may preclude realization of the full benefits expected by us and could harm our results of operations. In addition, the overall integration of the combining companies may result in unanticipated problems, expenses, liabilities, and competitive responses, and may cause our stock price to decline. The difficulties of integrating an acquisition include, among others:

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issues in integrating information, communications and other systems;



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incompatibility of logistics, marketing and administration methods;



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maintaining employee morale and retaining key employees;



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integrating the business cultures of both companies;

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•

preserving important strategic client relationships;



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consolidating corporate and administrative infrastructures and eliminating duplicative operations; and



•

coordinating and integrating geographically separate organizations.

              In addition, even if the operations of an acquisition are integrated successfully, we may not realize the full benefits of the acquisition, including the synergies, cost savings or growth opportunities that we expect. These benefits may not be achieved within the anticipated time frame, or at all.

              Further, acquisitions may cause us to:

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issue common stock that would dilute our current stockholders' ownership percentage;



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use a substantial portion of our cash resources;



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increase our interest expense, leverage and debt service requirements (if we incur additional debt to pay for an acquisition);



•

assume liabilities, including environmental liabilities, for which we do not have indemnification from the former owners. Further, indemnification obligations may be subject to dispute or concerns regarding the creditworthiness of the former owners;



•

record goodwill and non-amortizable intangible assets that are subject to impairment testing and potential impairment charges;



•

experience volatility in earnings due to changes in contingent consideration related to acquisition earn-out liability estimates;



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incur amortization expenses related to certain intangible assets;



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lose existing or potential contracts as a result of conflict of interest issues;



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incur large and immediate write-offs; or



•

become subject to litigation.

              Finally, acquired companies that derive a significant portion of their revenue from the U.S. federal government and that do not follow the same cost accounting policies and billing practices that we follow may be subject to larger cost disallowances for greater periods than we typically encounter. If we fail to determine the existence of unallowable costs and do not establish appropriate reserves in advance of an acquisition, we may be exposed to material unanticipated liabilities, which could have a material adverse effect on our business.

If our goodwill or other intangible assets become impaired, then our profits may be significantly reduced.

              Because we have historically acquired a significant number of companies, goodwill and other intangible assets represent a substantial portion of our assets. At September 29, 2013, our goodwill was $722.8 million and other intangible assets were $87.0 million. We are required to perform a goodwill impairment test for potential impairment at least on an annual basis. We also assess the recoverability of the unamortized balance of our intangible assets when indications of impairment are present based on

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expected future profitability and undiscounted expected cash flows and their contribution to our overall operations. The goodwill impairment test requires us to determine the fair value of our reporting units, which are the components one level below our reportable segments. In determining fair value, we make significant judgments and estimates, including assumptions about our strategic plans with regard to our operations. We also analyze current economic indicators and market valuations to help determine fair value. To the extent economic conditions that would impact the future operations of our reporting units change, our goodwill may be deemed to be impaired, and we would be required to record a non-cash charge that could result in a material adverse effect on our financial position or results of operations.

              In the third quarter of fiscal 2013, we performed an interim goodwill impairment test and recorded a $56.6 million, or $48.1 million, net of tax, goodwill impairment charge in the ECS segment.

If we are not able to successfully manage our growth strategy, our business and results of operations may be adversely affected.

              Our expected future growth presents numerous managerial, administrative, operational and other challenges. Our ability to manage the growth of our operations will require us to continue to improve our management information systems and our other internal systems and controls. In addition, our growth will increase our need to attract, develop, motivate and retain both our management and professional employees. The inability to effectively manage our growth or the inability of our employees to achieve anticipated performance could have a material adverse effect on our business.

Our backlog is subject to cancellation, unexpected adjustments and economic conditions, and is an uncertain indicator of future operating results.

              Our backlog at September 29, 2013, was $1.9 billion, a decrease of $225.7 million, or 10.6%, compared to last year-end. We include in backlog only those contracts for which funding has been provided and work authorizations have been received. We cannot guarantee that the revenue projected in our backlog will be realized or, if realized, will result in profits. In addition, project cancellations or scope adjustments may occur, from time to time, with respect to contracts reflected in our backlog. For example, certain of our contracts with the U.S. federal government and other clients are terminable at the discretion of the client, with or without cause. These types of backlog reductions could adversely affect our revenue and margins. In fiscal 2013, the broad-based decline in our backlog resulted from the volatility of current economic conditions, and increased ambiguity as to whether the U.S. or the global economy will grow modestly or remain stagnant. These conditions have been, and could continue to be, negatively impacted by the mandatory federal budget reductions, or sequestrations. As a result of these factors, our backlog as of any particular date is an uncertain indicator of our future earnings.

If our business partners fail to perform their contractual obligations on a project, we could be exposed to legal liability, loss of reputation and profit reduction or loss on the project.

              We routinely enter into subcontracts and, occasionally, joint ventures, teaming arrangements and other contractual arrangements so that we can jointly bid and perform on a particular project. Success under these arrangements depends in large part on whether our business partners fulfill their contractual obligations satisfactorily. In addition, when we operate through a joint venture in which we are a minority holder, we have limited control over many project decisions, including decisions related to the joint venture's internal controls, which may not be subject to the same internal control procedures that we employ. If these unaffiliated third parties do not fulfill their contract obligations, the partnerships or joint ventures may be unable to adequately perform and deliver their contracted services. Under these circumstances, we may be obligated to pay financial penalties, provide additional services to ensure the adequate performance and delivery of the contracted services and may be jointly and severally liable for the other's actions or contract performance. These additional obligations could result in reduced profits

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and revenues or, in some cases, significant losses for us with respect to the joint venture, which could also affect our reputation in the industries we serve.

If our contractors and subcontractors fail to satisfy their obligations to us or other parties, or if we are unable to maintain these relationships, our revenue, profitability and growth prospects could be adversely affected.

              We depend on contractors and subcontractors in conducting our business. There is a risk that we may have disputes with our subcontractors arising from, among other things, the quality and timeliness of work performed by the subcontractor, client concerns about the subcontractor, or our failure to extend existing task orders or issue new task orders under a subcontract. In addition, if a subcontractor fails to deliver on a timely basis the agreed-upon supplies, fails to perform the agreed-upon services or goes out of business, then we may be required to purchase the services or supplies from another source at a higher price, and our ability to fulfill our obligations as a prime contractor may be jeopardized. This may reduce the profit to be realized or result in a loss on a project for which the services or supplies are needed.

              We also rely on relationships with other contractors when we act as their subcontractor or joint venture partner. The absence of qualified subcontractors with which we have a satisfactory relationship could adversely affect the quality of our service and our ability to perform under some of our contracts. Our future revenue and growth prospects could be adversely affected if other contractors eliminate or reduce their subcontracts or teaming arrangement relationships with us, or if a government agency terminates or reduces these other contractors' programs, does not award them new contracts or refuses to pay under a contract.

We may be required to pay liquidated damages if we fail to meet milestone requirements in our contracts.

              We may be required to pay liquidated damages if we fail to meet milestone requirements in our contracts. Failure to meet any of the milestone requirements could result in additional costs, and the amount of such additional costs could exceed the projected profits on the project. These additional costs include liquidated damages paid under contractual penalty provisions, which can be substantial and can accrue on a regular basis.

Changes in resource management, environmental or infrastructure industry laws, regulations and programs could directly or indirectly reduce the demand for our services, which could in turn negatively impact our revenue.

              Some of our services are directly or indirectly impacted by changes in U.S. federal, state, local or foreign laws and regulations pertaining to the resource management, environmental and infrastructure industries. Accordingly, a relaxation or repeal of these laws and regulations, or changes in governmental policies regarding the funding, implementation or enforcement of these programs, could result in a decline in demand for our services, which could in turn negatively impact our revenue.

Changes in capital markets could adversely affect our access to capital and negatively impact our business.

              Our results could be adversely affected by an inability to access the revolving credit facility under our credit agreement, as amended and restated on May 7, 2013 (the "Amended Credit Agreement"). Unfavorable financial or economic conditions could impact certain lenders' willingness or ability to fund our revolving credit facility. In addition, increases in interest rates or credit spreads, volatility in financial markets or the interest rate environment, significant political or economic events, defaults of significant issuers and other market and economic factors may negatively impact the general level of debt issuance, the debt issuance plans of certain categories of borrowers, the types of credit-sensitive products being offered, and/or a sustained period of market decline or weakness could have a material adverse effect on us.

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Restrictive covenants in our credit agreement may restrict our ability to pursue certain business strategies.

              Our Amended Credit Agreement limits or restricts our ability to, among other things:

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incur additional indebtedness;



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create liens securing debt or other encumbrances on our assets;



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make loans or advances;



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pay dividends or make distributions to our stockholders;



•

purchase or redeem our stock;



•

repay indebtedness that is junior to indebtedness under our credit agreement;



•

acquire the assets of, or merge or consolidate with, other companies; and



•

sell, lease or otherwise dispose of assets.

              Our Amended Credit Agreement also requires that we maintain certain financial ratios, which we may not be able to achieve. The covenants may impair our ability to finance future operations or capital needs or to engage in other favorable business activities.

Our industry is highly competitive and we may be unable to compete effectively.

              Our industry is highly fragmented and intensely competitive. Our competitors are numerous, ranging from small private firms to multi-billion-dollar public companies. In addition, the technical and professional aspects of our services generally do not require large upfront capital expenditures and provide limited barriers against new competitors. Some of our competitors have achieved greater market penetration in some of the markets in which we compete, and some have substantially more financial resources and/or financial flexibility than we do. As a result of the number of competitors in the industry, our clients may select one of our competitors on a project due to competitive pricing or a specific skill set. This competitive environment could force us to make price concessions or otherwise reduce prices for our services. If we are unable to maintain our competitiveness, our market share, revenue and profits will decline.

Legal proceedings, investigations and disputes could result in substantial monetary penalties and damages, especially if such penalties and damages exceed or are excluded from existing insurance coverage.

              We engage in consulting, engineering, program management, construction management, construction and technical services that can result in substantial injury or damages that may expose us to legal proceedings, investigations and disputes. For example, in the ordinary course of our business, we may be involved in legal disputes regarding personal injury claims, employee or labor disputes, professional liability claims, and general commercial disputes involving project cost overruns and liquidated damages as well as other claims. In addition, in the ordinary course of our business, we frequently make professional judgments and recommendations about environmental and engineering conditions of project sites for our clients, and we may be deemed to be responsible for these judgments and recommendations if they are later determined to be inaccurate. Any unfavorable legal ruling against us could result in substantial monetary damages or even criminal violations. We maintain insurance coverage as part of our overall legal and risk management strategy to minimize our potential liabilities; however, insurance coverage contains exclusions and other limitations that may not cover our potential liabilities. Generally, our insurance program covers workers' compensation and employer's liability, general liability, automobile liability, professional errors and

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omissions liability, property, and contractor's pollution liability (in addition to other policies for specific projects). Our insurance program includes deductibles or self-insured retentions for each covered claim that may increase over time. In addition, our insurance policies contain exclusions that insurance providers may use to deny or restrict coverage. Excess liability and professional liability insurance policies provide for coverage on a "claims-made" basis, covering only claims actually made and reported during the policy period currently in effect. If we sustain liabilities that exceed or that are excluded from our insurance coverage or for which we are not insured, it could have a material adverse impact on our results of operations and financial condition (see Note 17, "Commitments and Contingencies" of the "Notes to Consolidated Financial Statements" included in Item 8 for more information).

Unavailability or cancellation of third-party insurance coverage would increase our overall risk exposure as well as disrupt the management of our business operations.

              We maintain insurance coverage from third-party insurers as part of our overall risk management strategy and because some of our contracts require us to maintain specific insurance coverage limits. If any of our third-party insurers fail, suddenly cancel our coverage or otherwise are unable to provide us with adequate insurance coverage, then our overall risk exposure and our operational expenses would increase and the management of our business operations would be disrupted. In addition, there can be no assurance that any of our existing insurance coverage will be renewable upon the expiration of the coverage period or that future coverage will be affordable at the required limits.

Our inability to obtain adequate bonding could have a material adverse effect on our future revenue and business prospects.

              Certain clients require bid bonds and performance and payment bonds. These bonds indemnify the client should we fail to perform our obligations under a contract. If a bond is required for a particular project and we are unable to obtain an appropriate bond, we cannot pursue that project. In some instances, we are required to co-venture with a small or disadvantaged business to pursue certain U.S. federal or state government contracts. In connection with these ventures, we are sometimes required to utilize our bonding capacity to cover all of the payment and performance obligations under the contract with the client. We have a bonding facility but, as is typically the case, the issuance of bonds under that facility is at the surety's sole discretion. Moreover, due to events that can negatively affect the insurance and bonding markets, bonding may be more difficult to obtain or may only be available at significant additional cost. There can be no assurance that bonds will continue to be available to us on reasonable terms. Our inability to obtain adequate bonding and, as a result, to bid on new work could have a material adverse effect on our future revenue and business prospects.

Our failure to adequately recover on claims brought by us against clients for additional contract costs could have a negative impact on our liquidity and profitability.

              We have brought claims against clients for additional costs exceeding the contract price or for amounts not included in the original contract price. These types of claims occur due to matters such as client-caused delays or changes from the initial project scope, both of which may result in additional cost. Often, these claims can be the subject of lengthy arbitration or litigation proceedings, and it is difficult to accurately predict when these claims will be fully resolved. When these types of events occur and unresolved claims are pending, we have used working capital in projects to cover cost overruns pending the resolution of the relevant claims. A failure to promptly recover on these types of claims could have a negative impact on our liquidity and profitability.

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Employee, agent or partner misconduct or our failure to comply with anti-bribery and other laws or regulations could harm our reputation, reduce our revenue and profits, and subject us to criminal and civil enforcement actions.

              Misconduct, fraud, non-compliance with applicable laws and regulations, or other improper activities by one of our employees, agents or partners could have a significant negative impact on our business and reputation. Such misconduct could include the failure to comply with government procurement regulations, regulations regarding the protection of classified information, regulations prohibiting bribery and other foreign corrupt practices, regulations regarding the pricing of labor and other costs in government contracts, regulations on lobbying or similar activities, regulations pertaining to the internal controls over financial reporting, environmental laws and any other applicable laws or regulations. For example, the FCPA and similar anti-bribery laws in other jurisdictions generally prohibit companies and their intermediaries from making improper payments to non-U.S. officials for the purpose of obtaining or retaining business. Our policies mandate compliance with these regulations and laws, and we take precautions to prevent and detect misconduct. However, since our internal controls are subject to inherent limitations, including human error, it is possible that these controls could be intentionally circumvented or become inadequate because of changed conditions. As a result, we cannot assure that our controls will protect us from reckless or criminal acts committed by our employees or agents. Our failure to comply with applicable laws or regulations or acts of misconduct could subject us to fines and penalties, loss of security clearances, and suspension or debarment from contracting, any or all of which could harm our reputation, reduce our revenue and profits, and subject us to criminal and civil enforcement actions.

Our business activities may require our employees to travel to and work in countries where there are high security risks, which may result in employee death or injury, repatriation costs or other unforeseen costs.

              Certain of our contracts may require our employees travel to and work in high-risk countries that are undergoing political, social and economic upheavals resulting from war, civil unrest, criminal activity, acts of terrorism or public health crises. For example, we currently have employees working in high security risk countries such as Afghanistan. As a result, we risk loss of or injury to our employees and may be subject to costs related to employee death or injury, repatriation or other unforeseen circumstances. We may choose or be forced to leave a country with little or no warning due to physical security risks.

Our failure to implement and comply with our safety program could adversely affect our operating results or financial condition.

              Our safety program is a fundamental element of our overall approach to risk management, and the implementation of the safety program is a significant issue in our dealings with our clients. We maintain an enterprise-wide group of health and safety professionals to help ensure that the services we provide are delivered safely and in accordance with standard work processes. Unsafe job sites and office environments have the potential to increase employee turnover, increase the cost of a project to our clients, expose us to types and levels of risk that are fundamentally unacceptable, and raise our operating costs. The implementation of our safety processes and procedures are monitored by various agencies, including the U.S. Mine Safety and Health Administration, and rating bureaus and may be evaluated by certain clients in cases in which safety requirements have been established in our contracts. Our failure to meet these requirements or our failure to properly implement and comply with our safety program could result in reduced profitability or the loss of projects or clients, and could have a material adverse effect on our business, operating results or financial condition.

We may be precluded from providing certain services due to conflict of interest issues.

              Many of our clients are concerned about potential or actual conflicts of interest in retaining management consultants. U.S. federal government agencies have formal policies against continuing or

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awarding contracts that would create actual or potential conflicts of interest with other activities of a contractor. These policies, among other things, may prevent us from bidding for or performing government contracts resulting from or relating to certain work we have performed. In addition, services performed for a commercial or government client may create a conflict of interest that precludes or limits our ability to obtain work from other public or private organizations. We have, on occasion, declined to bid on projects due to conflict of interest issues.

If our reports and opinions are not in compliance with professional standards and other regulations, we could be subject to monetary damages and penalties.

              We issue reports and opinions to clients based on our professional engineering expertise, as well as our other professional credentials. Our reports and opinions may need to comply with professional standards, licensing requirements, securities regulations and other laws and rules governing the performance of professional services in the jurisdiction in which the services are performed. In addition, we could be liable to third parties who use or rely upon our reports or opinions even if we are not contractually bound to those third parties. For example, if we deliver an inaccurate report or one that is not in compliance with the relevant standards, and that report is made available to a third party, we could be subject to third-party liability, resulting in monetary damages and penalties.

We may be subject to liabilities under environmental laws and regulations.

              Our services are subject to numerous U.S. and international environmental protection laws and regulations that are complex and stringent. For example, we must comply with a number of U.S. federal government laws that strictly regulate the handling, removal, treatment, transportation and disposal of toxic and hazardous substances. Under the Comprehensive Environmental Response Compensation and Liability Act of 1980, as amended ("CERCLA"), and comparable state laws, we may be required to investigate and remediate regulated hazardous materials. CERCLA and comparable state laws typically impose strict, joint and several liabilities without regard to whether a company knew of or caused the release of hazardous substances. The liability for the entire cost of clean-up could be imposed upon any responsible party. Other principal U.S. federal environmental, health and safety laws affecting us include, but are not limited to, the Resource Conversation and Recovery Act, the National Environmental Policy Act, the Clean Air Act, the Occupational Safety and Health Act, the Federal Mine Safety and Health Act of 1977 (the "Mine Act"), the Toxic Substances Control Act and the Superfund Amendments and Reauthorization Act. Our business operations may also be subject to similar state and international laws relating to environmental protection. Further, past business practices at companies that we have acquired may also expose us to future unknown environmental liabilities. Liabilities related to environmental contamination or human exposure to hazardous substances, or a failure to comply with applicable regulations, could result in substantial costs to us, including clean-up costs, fines civil or criminal sanctions and third-party claims for property damage or personal injury or cessation of remediation activities. Our continuing work in the areas governed by these laws and regulations exposes us to the risk of substantial liability.

Force majeure events, including natural disasters and terrorist actions could negatively impact the economies in which we operate or disrupt our operations, which may affect our financial condition, results of operations or cash flows.

              Force majeure or extraordinary events beyond the control of the contracting parties, such as natural and man-made disasters, as well as terrorist actions, could negatively impact the economies in which we operate by causing the closure of offices, interrupting projects and forcing the relocation of employees. Further, despite our implementation of network security measures, our servers are vulnerable to computer viruses, break-ins and similar disruptions from unauthorized tampering with our computer systems. We typically remain obligated to perform our services after a terrorist action or natural disaster unless the contract contains a force majeure clause that relieves us of our contractual obligations in such an

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extraordinary event. If we are not able to react quickly to force majeure, our operations may be affected significantly, which would have a negative impact on our financial condition, results of operations or cash flows.

We have only a limited ability to protect our intellectual property rights, and our failure to protect our intellectual property rights could adversely affect our competitive position.

              Our success depends, in part, upon our ability to protect our proprietary information and other intellectual property. We rely principally on trade secrets to protect much of our intellectual property where we do not believe that patent or copyright protection is appropriate or obtainable. However, trade secrets are difficult to protect. Although our employees are subject to confidentiality obligations, this protection may be inadequate to deter or prevent misappropriation of our confidential information. In addition, we may be unable to detect unauthorized use of our intellectual property or otherwise take appropriate steps to enforce our rights. Failure to obtain or maintain trade secret protection could adversely affect our competitive business position. In addition, if we are unable to prevent third parties from infringing or misappropriating our trademarks or other proprietary information, our competitive position could be adversely affected.

Systems and information technology interruption could adversely impact our ability to operate.

              We rely heavily on computer, information, and communications technology and systems to operate. From time to time, we experience system interruptions and delays. If we are unable to effectively deploy software and hardware, upgrade our systems and network infrastructure, and take steps to improve and protect our systems, systems operations could be interrupted or delayed.

              Our computer and communications systems and operations could be damaged or interrupted by natural disasters, telecommunications failures, acts of war or terrorism and similar events or disruptions. In addition, we face the threat of unauthorized system access, computer hackers, computer viruses, malicious code, organized cyber-attacks, and other security breaches and system disruptions. We devote significant resources to the security of our computer systems, but they may still be vulnerable to threats. Anyone who circumvents security measures could misappropriate proprietary information or cause interruptions or malfunctions in system operations. As a result, we may be required to expend significant resources to protect against the threat of system disruptions and security breaches, or to alleviate problems caused by disruptions and breaches.

              Any of these or other events could cause system interruption, delays, and loss of critical data that could delay or prevent operations, and could have a material adverse effect on our business, financial condition, results of operations and cash flows, and could negatively impact our clients.

Delaware law and our charter documents may impede or discourage a merger, takeover or other business combination even if the business combination would have been in the best interests of our stockholders.

              We are a Delaware corporation and the anti-takeover provisions of Delaware law impose various impediments to the ability of a third party to acquire control of us, even if a change in control would be beneficial to our stockholders. In addition, our Board of Directors has the power, without stockholder approval, to designate the terms of one or more series of preferred stock and issue shares of preferred stock, which could be used defensively if a takeover is threatened. Our incorporation under Delaware law, the ability of our Board of Directors to create and issue a new series of preferred stock and provisions in our certificate of incorporation and bylaws, such as those relating to advance notice of certain stockholder proposals and nominations, could impede a merger, takeover or other business combination involving us or discourage a potential acquirer from making a tender offer for our common stock, even if the business combination would have been in the best interests of our current stockholders.

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Our stock price could become more volatile and stockholders' investments could lose value.

              In addition to the macroeconomic factors that have affected the prices of many securities generally, all of the factors discussed in this section could affect our stock price. Our common stock has previously experienced substantial price volatility. In addition, the stock market has experienced extreme price and volume fluctuations that have affected the market price of many companies and that have often been unrelated to the operating performance of these companies. The overall market and the price of our common stock may fluctuate greatly. The trading price of our common stock may be significantly affected by various factors, including:

•

quarter-to-quarter variations in our financial results, including revenue, profits, days sales outstanding, backlog, and other measures of financial performance or financial condition;



•

our announcements or our competitors' announcements of significant events, including acquisitions;



•

resolution of threatened or pending litigation;



•

changes in investors' and analysts' perceptions of our business or any of our competitors' businesses;



•

investors' and analysts' assessments of reports prepared or conclusions reached by third parties;



•

changes in environmental legislation;



•

investors' perceptions of our performance of services in countries in which the U.S. military is engaged, including Afghanistan;



•

broader market fluctuations; and



•

general economic or political conditions.

              Volatility in the financial markets could cause a decline in our stock price, which could trigger an impairment of the goodwill of individual reporting units that could be material to our consolidated financial statements. A significant drop in the price of our stock could also expose us to the risk of securities class action lawsuits, which could result in substantial costs and divert management's attention and resources, which could adversely affect our business. Additionally, volatility or a lack of positive performance in our stock price may adversely affect our ability to retain key employees, many of whom are granted stock options and shares of restricted stock, the value of which is dependent on the performance of our stock price.

Item 1B.    Unresolved Staff Comments

              None.

Item 2.    Properties

              At fiscal 2013 year-end, we owned three facilities located in the United States and leased approximately 330 operating facilities in domestic and foreign locations. Our significant lease agreements expire at various dates through 2024. We also have some month-to-month leases. We believe that our current facilities are adequate for the operation of our business and that suitable additional space in various local markets is available to accommodate any needs that may arise.

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              The following table summarizes our ten most significant leased properties by location based on annual rental expenses:

Item 3.    Legal Proceedings

              For a description of our material pending legal and regulatory proceedings and settlements, see Note 17, "Commitments and Contingencies" of the "Notes to Consolidated Financial Statements" included in Item 8.

Item 4.    Mine Safety Disclosures

              Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act") requires domestic mine operators to disclose violations and orders issued under the Mine Act by the U.S. Mine Safety and Health Administration. We do not act as the owner of any mines, but we may act as a mining operator as defined under the Mine Act where we may be an independent contractor performing services or construction at such mine. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Act and Item 104 Regulations S-K is included in Exhibit 95.

PART II

Item 5.    Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

              Our common stock is traded on the NASDAQ Global Select Market under the symbol TTEK. There were 1,693 stockholders of record at November 11, 2013. The high and low sales prices per share for

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the common stock for the last two fiscal years, as reported by the NASDAQ Global Select Market, are set forth in the following tables.

              Our policy is to use cash flows from operations to fund future growth, pay down debt, and, subject to market conditions, repurchase common stock under a stock buy-back program approved by our Board of Directors. Accordingly, we have not paid any cash dividends since our inception and we currently have no plans to pay cash dividends in the foreseeable future. Additionally, our credit agreement limits the amount of cash dividends that may be declared or paid. For information regarding our stock-based compensation, see Note 11, "Stockholders' Equity and Stock Compensation Plans" of the "Notes to Consolidated Financial Statements" included in Item 8.

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Performance Graph

              The following graph shows a comparison of our cumulative total returns with those of the NASDAQ Market Index and our self-constructed Peer Group Index (as defined below). The graph assumes that the value of an investment in our common stock and in each such index was $100 on September 29, 2008, and that all dividends have been reinvested. No cash dividends have been declared on shares of our common stock. Our self-constructed Peer Group Index includes the following companies: AECOM Technology Corporation; Foster Wheeler AG; Jacobs Engineering Group; Michael Baker Corporation; URS Corporation; and Willbros Group, Inc. We removed The Shaw Group, Inc. from the Peer Group Index to reflect the completion of Chicago Bridge & Iron Company N.V.'s acquisition of The Shaw Group, Inc. in our fiscal 2013. The comparison in the graph below is based on historical data and is not intended to forecast the possible future performance of our common stock.

COMPARISON OF CUMULATIVE TOTAL RETURN

              The performance graph above and related text are being furnished solely to accompany this annual report on Form 10-K pursuant to Item 201(e) of Regulation S-K, and are not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and are not to be incorporated by reference into any of our filings with the SEC, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

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Stock Repurchase Program

              In June 2013, our Board of Directors authorized a stock repurchase program under which we may currently repurchase up to $100 million of Tetra Tech common stock (the "Stock Repurchase Program"). In November 2013, our Board of Directors amended the Stock Repurchase Program, effective on November 18, 2013, to revise the pricing parameters and to extend the program through fiscal 2014. Stock repurchases may be made on the open market or in privately negotiated transactions with third parties. Because the repurchases under the Stock Repurchase Program are subject to certain pricing parameters, there is no guarantee as to the exact number of shares that will be repurchased under the program.

              A summary of the repurchase activity for the fiscal year ended September 29, 2013 is as follows:

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⁽¹⁾

We purchased approximately 775,000 additional shares in fiscal 2013 that were previously issued pursuant to awards issued under our stock-based compensation plans. These plans allow our employees to surrender shares of our common stock as payment toward the exercise cost and tax withholding obligations associated with the exercise of stock options or the vesting of restricted stock.

⁽²⁾

We may currently repurchase up to $100 million of Tetra Tech common stock under the Stock Repurchase Program, which was publicly announced in June 2013. The Stock Repurchase Program will currently expire at the earliest of (i) the close of business on September 28, 2014, (ii) any optional termination date, (iii) the date on which any required termination notice is received by our broker, (iv) the close of business on the date that the maximum $100 million of common stock has been purchased, or (v) the date that our broker becomes aware of the commencement or impending commencement of any voluntary or involuntary proceedings relating to our bankruptcy or insolvency.

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Item 6.    Selected Financial Data

              The following selected financial data was derived from our consolidated financial statements. The selected financial data presented below should be read in conjunction with the information contained in Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations," and our consolidated financial statements and the notes thereto contained in Item 8, "Financial Statements and Supplementary Data," of this report.

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Item 7.    Management's Discussion and Analysis of Financial Condition and Results of Operations

              The following analysis of our financial condition and results of operations should be read in conjunction with Part 1 of this report, as well as our consolidated financial statements and accompanying notes in Item 8. The following analysis contains forward-looking statements about our future results of operations and expectations. Our actual results and the timing of events could differ materially from those described herein. See Part 1, Item 1A, "Risk Factors" for a discussion of the risks, assumptions and uncertainties affecting these statements.

OVERVIEW OF RESULTS AND BUSINESS TRENDS

              General.    In fiscal 2013, our revenue declined compared to last year and we reported a net loss. Our financial results were adversely impacted by weakness in our Eastern Canada and global mining operations, and we incurred significant costs to right-size these businesses during the third quarter of fiscal 2013. We also incurred significant charges on certain projects that further reduced our revenue and earnings. To a lesser extent, we experienced an expected decline in revenue from U.S. federal government programs as uncertainty regarding the U.S. federal budget continued to delay project funding. Our earnings were also negatively affected by a non-cash goodwill impairment charge recorded in the third quarter of fiscal 2013.

              Impact of Recent Business Environment.    Current economic conditions have been somewhat volatile, and there is increased ambiguity as to whether the U.S. or the global economy will grow modestly or remain stagnant. The uncertainty regarding the U.S. federal budget and the impact of tax increases has added to the doubt regarding economic conditions generally. These conditions have been, and could continue to be, negatively impacted by mandatory federal budget reductions, or sequestrations, that became effective in our fiscal second quarter. In addition, concerns over these conditions appear to be restraining business owners from making the significant investment commitments needed to fund future growth.

              In Eastern Canada, poor economic conditions, including budget deficits, reduced customer spending and an ongoing government investigation into political corruption in Quebec, have slowed procurements and business activity in that region. As a result, we experienced weaker than expected financial performance in our Eastern Canadian operations and we took actions to right-size the business that resulted in significant severance and office closure charges in the third quarter of fiscal 2013.

              Our work for mining customers also slowed more than expected in the third quarter of fiscal 2013 as these customers responded to lower global growth expectations. This was driven in large part by China's report in April 2013 of slower economic growth. As a result, our mining customers experienced a significant reduction in the global demand for commodities that caused a drop in mineral prices. Due to the subsequent slowdown in mining activities, we right-sized our global mining business by reducing staff and closing offices in the third quarter of fiscal 2013.

              These events exacerbated negative business trends and adversely impacted our related operations. Consequently, we recorded a non-cash goodwill impairment charge in the third quarter. Persistent negative market conditions and financial results could result in additional goodwill impairment. With these trends and overall uncertainty, it is difficult to confidently predict the future direction in which the U.S. and global economies are headed. Strong economic expansion generally benefits our business while a tepid financial recovery could adversely impact demand for our services. It is not possible to predict with certainty whether or when a recovery may occur, or what impact this would have on our business, results of operations, cash flows or financial condition.

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              International.    For fiscal 2013, our international business grew 5.1% compared to last year. The growth was driven by the continued expansion of our services to the oil and gas industry, primarily as a result of acquisitions. We expect that our international business will continue its growth in fiscal 2014 as a result of our continued expansion in Canada and South America, together with demand for our oil and gas, and industrial water services from our largest clients worldwide. However, this growth is expected to be tempered by anticipated reductions in our Eastern Canada and global mining operations.

              U.S. Commercial.    For fiscal 2013, our U.S. commercial business declined 3.4% compared to last year. This decline resulted from a project charge to revenue on a development project in the third quarter of fiscal 2013. The decline was partially mitigated by the growth in many of our service offerings, including services provided for oil and gas clients that generates relatively high profit margins. In addition, our solid waste management operations increased, primarily due to an acquisition in fiscal 2013. We are optimistic regarding increased spending by our energy-focused clients, particularly in oil and gas, as well as by our larger industrial clients. As such, we expect that our U.S. commercial business will grow in fiscal 2014. Our U.S. commercial clients typically react rapidly to economic change. Accordingly, if the U.S. economy experiences a slowdown or pickup in fiscal 2014, we would expect our U.S. commercial outlook to change accordingly.

              U.S. Federal Government.    For fiscal 2013, our U.S. federal business declined 17.7% compared to last year. This decline resulted from a broad-based slowdown of discretionary U.S. federal government programs due in part to the impact of U.S. federal budget uncertainty and the on-going sequestration. Significant project-related charges to revenue in the third quarter further reduced revenue for fiscal 2013. During periods of economic volatility, our U.S. federal government clients have historically been the most stable and predictable. However, due to the uncertainty associated with the U.S. federal budget and sequestration, we remain cautious and expect future revenue to slightly decline.

              U.S. State and Local Government.    For fiscal 2013, our U.S. state and local government business grew 22.7% compared to last year. This growth was driven by increased revenue from essential priority programs. Many state and local government agencies are now experiencing improved financial conditions compared to recent years. Simultaneously, states are facing major long-term infrastructure needs, including the need for maintenance, repair and upgrading of existing critical infrastructure and the need to build new facilities. The funding risks associated with our U.S. state and local government programs are partially mitigated by legal requirements that drive some of these programs, such as regulatory-mandated consent decrees. As a result, some programs, such as those focused on municipal water and solid waste, will progress despite budget pressures as demonstrated by the growth in fiscal 2012 and 2013. Although we anticipate that many state and local government agencies will continue to face economic challenges, we expect our U.S. state and local government business to continue its growth in fiscal 2014 because of our focus on essential programs.

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RESULTS OF OPERATIONS

Fiscal 2013 Compared to Fiscal 2012

Consolidated Results of Operations

              Our revenue and operating income were adversely impacted by weakness in certain areas of our business that resulted in reduced revenue, significant costs to right-size the related operations, and a non-cash goodwill impairment charge in the third quarter of fiscal 2013. In addition, we recorded project-related charges that reduced revenue and increased project costs. As a result of these factors, revenue decreased $97.3 million, or 3.6%, and operating income decreased $146.1 million, or 87.8%, compared to last year. However, revenue, net of subcontractor costs, was flat because the revenue decline was offset by an increase in self-performed work compared to last year.

              Our fiscal 2013 results reflect the decline in our international business due to the impact of Eastern Canada, as well as the reduction in our commercial work due to the slow-down in global mining activities. Revenue and revenue, net of subcontractor costs, on a combined basis for these operations decreased $104.0 million and $83.0 million, respectively, compared to last year. Further, our revenue and

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revenue, net of subcontractor costs, declined $178.6 million and $99.2 million, respectively, in our U.S. federal government business due to a broad-based slowdown as a result of budgetary constraints, including the impact of sequestration, primarily impacting discretionary programs.

              The project charges that reduced revenue primarily related to adverse developments on certain projects in the third quarter in fiscal 2013, and our subsequent evaluations and conclusions concerning the collectability of the related unbilled accounts receivable. These charges included amounts related to claims, including requests for equitable adjustment, on three programs with U.S. federal and state and local government clients. In addition, we recorded a project-related charge on a commercial development contract due to a change in client ownership and the related modification of plans for completion of the project. These events adversely affected the collectability of certain related receivables and the profitability expectations for the project. Collectively, the project charges on these four programs reduced our fiscal 2013 revenue and revenue, net of subcontractor costs, by $29.6 million.

              The overall revenue decline was partially offset by increased activity on certain U.S. state and local government projects that were considered essential programs. Our fiscal 2013 revenue and revenue, net of subcontractor costs, from these activities increased $72.5 million and $50.3 million, respectively, compared to last year. Acquisitions completed in fiscal 2012 and 2013 contributed additional revenue in the aggregate amount of $194.1 million in fiscal 2013.

              Operating income decreased $146.1 million, or 87.8%, in fiscal 2013 compared to last year. The decrease largely resulted from a non-cash goodwill impairment charge of $56.6 million in the third quarter of fiscal 2013. Excluding this charge, our operating income was $76.8 million for fiscal 2013 compared to $166.4 million in the prior year. The remaining decline in operating income, excluding goodwill impairment, from last year was primarily due to project-related charges as well as the slowdown in our Eastern Canada and global mining operations. The project-related charges on the four programs described above collectively reduced our fiscal 2013 operating income by $40.1 million. In addition, the weaker results in our Eastern Canada and global mining operations and the resulting charges to right-size these businesses, as described above, reduced operating income by $48.4 million in fiscal 2013 compared to last year. These right-sizing costs are not expected to recur at this level.

              The decline in operating income also reflected the higher amortization of intangibles of $2.7 million in fiscal 2013 compared to last year, due to fiscal 2013 acquisitions. Additionally, the gains related to changes in the estimated fair value of our contingent earn-out liabilities decreased to $9.6 million in fiscal 2013 from $19.2 million in the prior year.

              In fiscal 2013, we recorded $14.0 million of income tax expense compared to $56.1 million in the prior year. The decrease was primarily due to lower operating income and, to a lesser extent, increased estimates of R&E credits for fiscal 2013. Our fiscal 2013 effective tax rate was 112.0% compared to 34.9% for the prior year. The rate increase resulted from a goodwill impairment charge that was substantially not deductible for tax purposes.

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Segment Results of Operations

Engineering and Consulting Services

              In fiscal 2013, revenue and revenue, net of subcontractor costs, decreased $119.3 million and $85.5 million, respectively, compared to last year. These results reflected the decline in our Canadian operations that are focused on municipal government and mining activities, as well as in our U.S. operations that are focused on federal government and mining-related business. The aggregate revenue and revenue, net of subcontractor costs, from these operations were $104.0 million and $83.0 million lower, respectively, in fiscal 2013 than in the prior year. Our operating income decreased $51.6 million in fiscal 2013 compared to last year. The decrease was primarily attributable to the causes described above, together with lower staff utilization and $10.3 million of severance and office-related closure costs incurred in the third quarter of fiscal 2013. Including these right-sizing costs, the combined reduction in operating income from our Eastern Canada and mining operations was $48.4 million for fiscal 2013.

Technical Support Services

              Revenue and revenue, net of subcontractor costs, declined $88.4 million and $28.7 million, respectively, in fiscal 2013 compared to last year. These declines were driven by reduced activity on U.S. federal government programs across several agencies. Revenue and revenue, net of subcontractor costs, from these programs decreased by $127.8 million and $50.6 million, respectively, compared to last year. The declines also were attributable to a $12.3 million negative revenue adjustment related to a project charge on a U.S. commercial development project in the third quarter of fiscal 2013. This charge resulted from a change in client ownership and the related modification in completion plans for the project. These revenue declines were partially mitigated by the growth in our work for oil and gas clients. We generated

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$42.3 million of revenue in fiscal 2013 compared to $10.6 million last year, from a company we acquired in the third quarter of fiscal 2012 that provides services for oil and gas clients. The overall decreases in revenue and revenue, net of subcontractor costs, were also partially mitigated by increased activity on our state and local government programs. Despite the aforementioned revenue declines, our operating income in fiscal 2013 was flat compared to last year, due to relatively higher profit margins on oil and gas projects.

Remediation and Construction Management

              Revenue and revenue, net of subcontractor costs, increased $103.7 million and $116.9 million, respectively, in fiscal 2013 compared to last year. These increases were attributable to additional work in our U.S. commercial and international oil and gas businesses that resulted from the acquisitions we completed in the second quarter of fiscal 2013. On a combined basis, these acquisitions contributed $170.3 million of revenue in fiscal 2013. In addition, our revenue and revenue, net of subcontractor costs, in our state and local government business continued to grow in fiscal 2013. The overall increases were partially offset by the aforementioned project-related charges that reduced our fiscal 2013 revenue and revenue, net of subcontractor costs, by $17.3 million. These project charges related to adverse changes in the estimated collectability of unbilled accounts receivable and estimated costs at completion. These included claims and requests for equitable adjustment on three programs with U.S. federal and state and local government clients. We reported $6.7 million of operating loss in the RCM segment for fiscal 2013. The project-related charges described above contributed $27.7 million to the fiscal 2013 operating loss. The remaining decrease in operating income compared to the prior year was attributable to lower utilization of labor and equipment resources related to decreased revenue.

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Fiscal 2012 Compared to Fiscal 2011

Consolidated Results of Operations

              Overall, our fiscal 2012 operating results improved significantly compared with fiscal 2011. Revenue and revenue, net of subcontractor costs, increased $137.9 million and $229.7 million, respectively, in fiscal 2012 compared to the prior year. The growth was driven by strong results in our U.S. commercial business, the continued expansion of our international business, and contributions from acquisitions completed during fiscal 2012 and 2011. To a lesser extent, our U.S. state and local government market also contributed to the growth. Our revenue, net of subcontractor costs, in our U.S. federal government business increased slightly versus last year; however, the related revenue declined due to decreased revenue from certain construction management projects for the DoD that had a high level of subcontracting activities. As a result, our overall revenue, net of subcontractor costs, grew at a higher rate than revenue compared to last year.

              Revenue and revenue, net of subcontractor costs, for our U.S. commercial business increased $140.7 million and $75.2 million, respectively, in fiscal 2012 compared to fiscal 2011. The growth was experienced across all of our reportable segments, and was primarily attributable to increased revenue from industrial, energy and environmental management projects for large multi-national companies. Revenue and revenue, net of subcontractor costs, for our international business increased $67.7 million and $112.1 million, respectively, in fiscal 2012 versus the prior year. The growth was driven by increased activity on our water, environmental and infrastructure design projects in Canada, Australia and South America, primarily for mining and other commodity-driven businesses. Additionally, revenue, net of subcontractor costs, grew at a faster pace than revenue due to increased self-performance on international projects in fiscal 2012. Revenue and revenue, net of subcontractor costs, for fiscal 2012 included contributions from acquisitions totaling $133.2 million and $122.3 million, respectively. Approximately one-third of these amounts were contributed by our international acquisitions. Our overall revenue growth was partially offset by declines in revenue and revenue, net of subcontractor costs, on DoD programs totaling $135.4 million and $49.6 million, respectively, in fiscal 2012 compared to fiscal 2011. These

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reductions resulted primarily from the wind-down of several large New Orleans hurricane protection projects for USACE and environmental remediation programs for the DoD.

              Operating income increased 13.6% in fiscal 2012 compared to fiscal 2011 primarily due to growth in our revenue and revenue, net of subcontractor costs. In addition, operating income increased at a higher rate than revenue due to better project performance in fiscal 2012. In fiscal 2011, operating income was reduced by contract costs incurred for project overruns of $21.0 million on several fixed-priced construction management projects in the RCM segment, and on an international development program in the TSS segment. These fiscal 2011 items were partially mitigated by a $10.6 million government performance-based incentive award fee on a large environmental remediation program in the RCM segment and a $2.0 million net favorable project settlement in our former EAS segment.

              In the fourth quarter of fiscal 2012, operating income was adversely impacted by $16.9 million of costs related to the reorganization of our operations as described above in the "Overview of Results and Business Trends." These costs included $6.4 million of compensation-related expenses for severance and employee retention. In addition, we recorded $4.4 million of lease exit costs, fixed asset write-downs and other long-lived asset impairments associated with office space reductions and relocations. Further, we incurred operational losses of $5.2 million for winding down certain India-based activities that are no longer supported by our reorganized business model. We also identified one small reporting unit in the EAS segment in which goodwill was impaired. This reporting unit realized lower than planned operating income during the fourth quarter of fiscal 2012, and projected future operating losses and negative cash flows that resulted in a $0.9 million non-cash goodwill impairment charge. Operating income in fiscal 2012 also included net gains of $19.2 million related to changes in the estimated fair value of our contingent earn-out liabilities during fiscal 2012, $17.3 million of which were recognized in the fourth quarter, compared to $1.8 million during fiscal 2011.

              The $17.3 million net decrease in our contingent consideration liability in the fourth quarter of fiscal 2012 included $12.5 million related to our determination in that quarter that one of our acquisitions in the TSS segment would not achieve the operating income we previously expected for the earn-out period. The remaining fourth quarter net earn-out adjustments primarily related to several of our recent acquisitions in the ECS segment for which the earn-out periods concluded in the fourth quarter of fiscal 2012.

              Income tax expense increased due to higher pre-tax income. Our effective tax rate for fiscal 2012 was 34.9% compared to 33.8% for fiscal 2011. The prior-year tax rate benefitted from the extension of R&E credits. There was a $1.2 million benefit from R&E credits for the last nine months of fiscal 2010 that was recorded in the first quarter of fiscal 2011. With the expiration of the R&E credits on December 31, 2011, we have not estimated a benefit from these credits beyond the expiration date.

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Segment Results of Operations

Engineering and Consulting Services

              Revenue and revenue, net of subcontractor costs, increased $45.2 million and $93.1 million, respectively, in fiscal 2012 compared to fiscal 2011. The growth was primarily driven by demand for our water, environmental and infrastructure design services globally, and our continued international expansion into Canada, Australia and South America. In fiscal 2012, recent acquisitions contributed $40.5 million to revenue.

              Despite the growth in revenue and revenue, net of subcontractor costs, operating income declined compared to fiscal 2011. Seasonal inclement weather conditions at our larger Canadian operations during the first half of fiscal 2012 contributed to the lower operating margin. The adverse working conditions resulted in lower staff utilization on projects and higher indirect expenses. Operating income was also negatively impacted by $3.2 million of severance and other discretionary compensation-related costs associated with reorganization in the fourth quarter of fiscal 2012. Additionally, the wind-down of several high-profit water and mining-related projects had a negative effect in comparison to fiscal 2012 operating income. Further, fiscal 2011 operating income benefited from a favorable $2.0 million net project settlement on a U.S. commercial infrastructure project.

Technical Support Services

              Revenue and revenue, net of subcontractor costs, increased $25.5 million and $89.2 million, respectively, in fiscal 2012 compared to fiscal 2011. This growth was primarily driven by the expansion of international development services provided to the DoS. Revenue from DoS services increased $82.2 million this fiscal year compared to fiscal 2011. Virtually all of the increase in DoS revenue resulted

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from an acquisition completed in the fourth quarter of fiscal 2011. An increase in U.S. commercial business contributed $24.6 million and $21.6 million of additional revenue and revenue, net of subcontractor costs, compared to fiscal 2011. An acquisition completed in fiscal 2012 contributed approximately one-half of this commercial growth. Revenue, net of subcontractor costs, grew at a faster rate than revenue due to reduced workload on, and completion of, certain USAID and EPA programs that had a high level of subcontracting activities in fiscal 2011.

              Operating income increased $1.8 million in fiscal 2012 compared to fiscal 2011 due to increased revenue, net of subcontractor costs. Acquisitions completed in the fourth quarter of fiscal 2011 and during fiscal 2012 contributed $6.7 million to the operating income increase. Further, fiscal 2011 operating income was negatively affected by $1.2 million of contract costs overruns on an international development program. The overall increase was partially offset by $2.2 million of severance and other discretionary compensation-related costs associated with our reorganization in the fourth quarter of fiscal 2012, and $5.2 million of losses for certain India-based activities.

Remediation and Construction Management

              Revenue and revenue, net of subcontractor costs, increased $17.3 million and $47.4 million, respectively, in fiscal 2012 compared to fiscal 2011. Our U.S. commercial business grew $96.5 million and $57.2 million in revenue and revenue, net of subcontractor costs, respectively, due primarily to expanded programs in our mining and energy businesses. Our U.S. state and local government business contributed $38.5 million and $31.4 million of revenue and revenue, net of subcontractor costs, respectively, due to several large infrastructure projects. The growth was partially offset by a revenue decline of $107.6 million, and a corresponding $33.2 million decrease in revenue, net of subcontractor costs, resulting from the wind-down of several large New Orleans hurricane protection projects for USACE and environmental remediation programs for the DoD at the end of fiscal 2011. The decline in revenue was larger than the related decline in revenue, net of subcontractor costs, because the USACE and DoD projects had a relatively high level of subcontractor costs.

              Operating income increased $9.2 million due partially to the increase in revenue, net of subcontractor costs, compared to fiscal 2011. In addition, fiscal 2011 operating income was adversely impacted by $20.0 million of contract cost overruns on several fixed-price infrastructure and energy projects and a $1.3 million charge for lease exit costs. These fiscal 2011 items were partially mitigated by $10.6 million of government performance-based incentive award fees on a large environmental remediation program with the DoD. In fiscal 2012, we benefitted from $2.9 million of gains related to the settlement of project claims and change orders partially offset by $2.4 million of project-related losses.

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Non-GAAP Financial Measures

              We are providing certain non-GAAP financial measures that we believe are appropriate for evaluating the operating performance of our business. These non-GAAP measures should not be considered in isolation from, and are not intended to represent an alternative measure of, operating results or cash flows from operating activities, as determined in accordance with U.S. GAAP.

              EBITDA represents net income (loss) attributable to Tetra Tech plus net interest expense, income taxes, depreciation and amortization. We believe EBITDA is a useful representation of our operating performance because of significant amounts of acquisition-related non-cash amortization expense, which can fluctuate significantly depending on the timing, nature and size of our business acquisitions. Revenue, net of subcontractor costs, is defined as revenue less subcontractor costs. For more information, see the "Consolidated Results of Operations" discussion above. EBITDA and revenue, net of subcontractor costs, as we calculate them, may not be comparable to similarly titled measures employed by other companies.

              The following is a reconciliation of EBITDA to net income attributable to Tetra Tech as well as revenue, net of subcontractor costs, for fiscal 2011 through 2013:

FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES

              Capital Requirements.    Our primary sources of liquidity are cash flows from operations and borrowings under our credit facilities. Our primary uses of cash are to fund working capital, capital expenditures, repurchases of stock under our Stock Repurchase Program and repayment of debt, as well as to fund acquisitions and earn-out obligations from prior acquisitions. We believe that our existing cash and cash equivalents, operating cash flows and borrowing capacity under our Amended Credit Agreement will be sufficient to meet our capital requirements for at least the next 12 months.

              We use a variety of tax planning and financing strategies to manage our worldwide cash and deploy funds to locations where they are needed. We also indefinitely reinvest our foreign earnings, and our current plans do not demonstrate a need to repatriate these earnings. Should we require additional capital in the United States, we may elect to repatriate indefinitely reinvested foreign funds or raise capital

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in the United States through debt. If we were to repatriate indefinitely reinvested foreign funds, we would be required to accrue and pay additional United States taxes less applicable foreign tax credits.

              As of September 29, 2013, cash and cash equivalents were $129.3 million, an increase of $24.5 million compared to the prior-year period. The increase in cash and cash equivalents was primarily due to net cash provided by operating activities and an increase in net debt borrowings, partially offset by increased cash payments for business acquisitions.

              Operating Activities.    Net cash provided by operating activities was $137.8 million, a decrease of $20.3 million compared to fiscal 2012. The decrease was due to lower EBITDA as a result of lower earnings in fiscal 2013. Additionally, the decrease resulted from changes in accounts payable, accrued compensation, prepaid expenses and other assets and income taxes. The overall decrease was partially mitigated by a favorable change in accounts receivable due to the timing of cash collections.

              Investing Activities.    Net cash used in investing activities was $196.6 million, an increase of $116.8 million compared to fiscal 2012. The increase was attributable to net cash payments related to business acquisitions completed during fiscal 2013. Our capital expenditures were $27.5 million, an increase of $2.4 million compared to the prior-year period. New equipment was purchased to replace obsolete equipment and satisfy requirements for project execution.

              Financing Activities.    Net cash provided by financing activities was $85.6 million, compared to net cash used in financing activities of $67.4 million in fiscal 2012. Our net borrowings under our Amended Credit Agreement increased $193.1 million due to the funding of our business acquisitions, working capital needs, stock repurchases and contingent earn-outs. The net cash provided by financing activities was partially offset by a $15.6 million increase in contingent earn-out payments and $20.0 million of stock repurchases compared to fiscal 2012.

              Debt Financing.    At September 30, 2012, we had a credit agreement that provided for a $460 million five-year revolving credit facility that matured in March 2016. On May 7, 2013, we entered into the Amended Credit Agreement and refinanced the indebtedness under the prior credit agreement. The Amended Credit Agreement is a $665 million senior secured, five-year facility that provides for a $205 million term loan facility (the "Term Loan Facility") and a $460 million revolving credit facility (the "Revolving Credit Facility"). The Amended Credit Agreement allows us to, among other things, finance certain permitted open market repurchases of our common stock, permitted acquisitions, and cash dividends and distributions. The Revolving Credit Facility includes a $200 million sublimit for the issuance of standby letters of credit, a $20 million sublimit for swingline loans, and a $150 million sublimit for multicurrency borrowings and letters of credit.

              The Term Loan Facility was drawn on May 7, 2013 and is subject to quarterly amortization of principal, with no principal payment due in year 1, $10.3 million payable in both years 2 and 3, and $15.4 million payable in both years 4 and 5, respectively. The Term Loan may be prepaid at any time without penalty. We may borrow on the Revolving Credit Facility, at our option, at either (a) a Eurocurrency rate plus a margin that ranges from 1.15% to 2.00% per annum, or (b) a base rate for loans in U.S. dollars (the highest of the U.S. federal funds rate plus 0.50% per annum, the bank's prime rate or the Eurocurrency rate plus 1.00%) plus a margin that ranges from 0.15% to 1.00% per annum. In each case, the applicable margin is based on our Consolidated Leverage Ratio, calculated quarterly. The Term Loan Facility is subject to the same interest rate provisions. The interest rate of the Term Loan Facility at the date of inception was 1.57%. The Amended Credit Agreement expires on May 7, 2018, or earlier at our discretion upon payment in full of loans and other obligations.

              As of September 29, 2013, we had $205.0 million in borrowings outstanding under the Amended Credit Agreement, consisting entirely of the Term Loan Facility at a weighted-average interest rate of

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1.56% per annum and $12.4 million in standby letters of credit. Our average effective interest rate on borrowings outstanding at September 29, 2013 under the Amended Credit Agreement, including the effects of interest rate swap agreements described in Note 14, "Derivative Financial Instruments" of the "Notes to Consolidated Financial Statements" included in Item 8, was 2.43%. At September 29, 2013, we had $447.6 million of available credit under the Revolving Credit Facility, of which $265.5 million could be borrowed without a violation of our debt covenants. In addition, we entered into agreements with three banks to issue up to $40 million in standby letters of credit. The aggregate amount of standby letters of credit outstanding under these additional facilities was $6.5 million, of which $6.4 million was issued in currencies other than the U.S. dollar.

              The Amended Credit Agreement contains certain affirmative and restrictive covenants, and customary events of default. The financial covenants provide for a maximum Consolidated Leverage Ratio of 2.50 to 1.00 (total funded debt/EBITDA, as defined in the Amended Credit Agreement) and a minimum Consolidated Fixed Charge Coverage Ratio of 1.25 to 1.00 (EBITDA, as defined in the Amended Credit Agreement minus capital expenditures/cash interest plus taxes plus principal payments of indebtedness including capital leases, notes and post-acquisition payments).

              On September 27, 2013, we entered into Amendment No. 1 ("Amendment No. 1") to the Amended Credit Agreement to amend the definition of "Consolidated EBITDA" for purposes of the financial covenants contained in the Amended Credit Agreement to add back to Consolidated Net Income for the fiscal quarters ending September 29, 2013, December 29, 2013 and March 30, 2014 (i) up to $34 million in non-recurring charges incurred during the fiscal quarter ended June 30, 2013 in connection with corporate restructurings and (ii) up to $36 million in non-cash charges incurred during the fiscal quarter ended June 30, 2013 in connection with the Four Programs referenced in our Form 8-Ks, filed with the SEC on June 18, 2013 and August 7, 2013, and Form 10-Q for the fiscal quarter ended June 30, 2013. Amendment No. 1 also provides that Consolidated EBITDA will be calculated without giving effect to the add-backs referenced above for purposes of determining our applicable margin in effect at any time.

              At September 29, 2013, we were in compliance with these covenants with a consolidated leverage ratio of 1.33x and a consolidated fixed charge coverage ratio of 2.21x. Our obligations under the Amended Credit Agreement are guaranteed by certain of our subsidiaries and are secured by first priority liens on (i) the equity interests of certain of our subsidiaries, including those subsidiaries that are guarantors or borrowers under the Amended Credit Agreement, and (ii) our accounts receivable, general intangibles and intercompany loans, and those of our subsidiaries that are guarantors or borrowers.

              Inflation.    We believe our operations have not been, and, in the foreseeable future, are not expected to be, materially adversely affected by inflation or changing prices due to the average duration of our projects and our ability to negotiate prices as contracts end and new contracts begin.

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              Contractual Obligations.    The following sets forth our contractual obligations at September 29, 2013:

Income Taxes

              We review the realizability of deferred tax assets on a quarterly basis by assessing the need for a valuation allowance. As of September 29, 2013, we performed our assessment of net deferred tax assets. Significant management judgment is required in determining the provision for income taxes and, in particular, any valuation allowance recorded against our deferred tax assets. Applying the applicable accounting guidance requires an assessment of all available evidence, positive and negative, regarding the realizability of the net deferred tax assets. Based upon recent results, we concluded that a cumulative loss in recent years exists in foreign jurisdictions. We have historically relied on the following factors in our assessment of the realizability of our net deferred tax assets:

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taxable income in prior carryback years as permitted under the tax law;



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future reversals of existing taxable temporary differences;



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consideration of available tax planning strategies and actions that could be implemented, if necessary; and



•

estimates of future taxable income from our operations.

              We considered these factors in our estimate of the reversal pattern of deferred tax assets, using assumptions that we believe are reasonable and consistent with operating results. However, as a result of projected cumulative pre-tax losses for the 36 months ended September 29, 2013, we concluded that our estimates of future taxable income and certain tax planning strategies did not constitute sufficient positive

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evidence to assert that it is more likely than not that certain deferred tax assets would be realizable before expiration. Although we project earnings in the business beyond 2013, we did not rely on these projections when assessing the realizability of our deferred tax assets.

Off-Balance Sheet Arrangements

              In the ordinary course of business, we may use off-balance sheet arrangements if we believe that such an arrangement would be an efficient way to lower our cost of capital or help us manage the overall risks of our business operations. We do not believe that such arrangements have had a material adverse effect on our financial position or our results of operations.

              The following is a summary of our off-balance sheet arrangements:

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Letters of credit and bank guarantees are used primarily to support project performance and insurance programs. We are required to reimburse the issuers of letters of credit and bank guarantees for any payments they make under the outstanding letters of credit or bank guarantees. Our Amended Credit Agreement and additional letter of credit facilities cover the issuance of our standby letters of credit and bank guarantees and are critical for our normal operations. If we default on the Amended Credit Agreement or additional credit facilities, our inability to issue or renew standby letters of credit and bank guarantees would impair our ability to maintain normal operations. We had $12.5 million in standby letters of credit outstanding under our Amended Credit Agreement and $6.5 million in standby letters of credit outstanding under our additional letter of credit facilities.



•

We have guaranteed a bank overdraft facility at one of our foreign affiliates in the amount of $0.9 million.



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From time to time, we provide guarantees and indemnifications related to our services. If our services under a guaranteed or indemnified project are later determined to have resulted in a material defect or other material deficiency, then we may be responsible for monetary damages or other legal remedies. When sufficient information about claims on guaranteed or indemnified projects is available and monetary damages or other costs or losses are determined to be probable, we recognize such guaranteed losses.



•

In the ordinary course of business, we enter into various agreements as part of certain unconsolidated subsidiaries, joint ventures, and other jointly executed contracts where we are jointly and severally liable. We enter into these agreements primarily to support the project execution commitments of these entities. The potential payment amount of an outstanding performance guarantee is typically the remaining cost of work to be performed by or on behalf of third parties under engineering and construction contracts. However, we are not able to estimate other amounts that may be required to be paid in excess of estimated costs to complete contracts and, accordingly, the total potential payment amount under our outstanding performance guarantees cannot be estimated. For cost-plus contracts, amounts that may become payable pursuant to guarantee provisions are normally recoverable from the client for work performed under the contract. For lump sum or fixed-price contracts, this amount is the cost to complete the contracted work less amounts remaining to be billed to the client under the contract. Remaining billable amounts could be greater or less than the cost to complete. In those cases where costs exceed the remaining amounts payable under the contract, we may have recourse to third parties, such as owners, co-venturers, subcontractors or vendors, for claims.



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In the ordinary course of business, our clients may request that we obtain surety bonds in connection with contract performance obligations that are not required to be recorded in our

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consolidated balance sheets. We are obligated to reimburse the issuer of our surety bonds for any payments made thereunder. Each of our commitments under performance bonds generally ends concurrently with the expiration of our related contractual obligation.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

              The preparation of our financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions in the application of certain accounting policies that affect amounts reported in our consolidated financial statements and accompanying footnotes included in Item 8 of this report. In order to understand better the changes that may occur to our financial condition, results of operations and cash flows, readers should be aware of the critical accounting policies we apply and estimates we use in preparing our consolidated financial statements. Although such estimates and assumptions are based on management's best knowledge of current events and actions we may undertake in the future, actual results could differ materially from those estimates.

              Our significant accounting policies are described in the "Notes to Consolidated Financial Statements" included in Item 8. Highlighted below are the accounting policies that management considers most critical to investors' understanding of our financial results and condition, and that require complex judgments by management.

Revenue Recognition and Contract Costs

              We recognize revenue for most of our contracts using the percentage-of-completion method, primarily based on contract costs incurred to date compared to total estimated contract costs. We generally utilize the cost-to-cost approach to estimate the progress towards completion in order to determine the amount of revenue and profit to recognize. This method of revenue recognition requires us to prepare estimates of costs to complete contracts in progress. In making such estimates, judgments are required to evaluate contingencies such as potential variances in schedule; the cost of materials and labor productivity; and the impact of change orders, liability claims, contract disputes and achievement of contractual performance standards. Changes in total estimated contract cost and losses, if any, could materially impact our results of operations or financial position. Certain of our contracts are service-related contracts, such as providing operations and maintenance services or a variety of technical assistance services. Our service contracts are accounted for using the proportional performance method under which revenue is recognized in proportion to the number of service activities performed, in proportion to the direct costs of performing the service activities, or evenly across the period of performance depending upon the nature of the services provided.

              We recognize revenue for work performed under three major types of contracts: fixed-price, time-and-materials and cost-plus.

              Fixed-Price.    We enter into two major types of fixed-price contracts: firm fixed-price ("FFP") and fixed-price per unit ("FPPU"). Under FFP contracts, our clients pay us an agreed fixed-amount negotiated in advance for a specified scope of work. We generally recognize revenue on FFP contracts using the percentage-of-completion method. If the nature or circumstances of the contract prevent us from preparing a reliable estimate at completion, we will delay profit recognition until adequate information about the contract's progress becomes available. Under our FPPU contracts, clients pay us a set fee for each service or production transaction that we complete. Accordingly, we recognize revenue under FPPU contracts as we complete the related service or production transactions, generally using the proportional performance method.

              Time-and-Materials.    Under time-and-materials contracts, we negotiate hourly billing rates and charge our clients based on the actual time that we spend on a project. In addition, clients reimburse us for

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our actual out-of-pocket costs of materials and other direct incidental expenditures that we incur in connection with our performance under the contract. The majority of our time-and-material contracts are subject to maximum contract values and, accordingly, revenue under these contracts is generally recognized under the percentage-of-completion method. However, time and materials contracts that are service-related contracts are accounted for utilizing the proportional performance method. Revenue on contracts that are not subject to maximum contract values is recognized based on the actual number of hours we spend on the projects plus any actual out-of-pocket costs of materials and other direct incidental expenditures that we incur on the projects. Our time-and-materials contracts also generally include annual billing rate adjustment provisions.

              Cost-Plus.    Under cost-plus contracts, we are reimbursed for allowable or otherwise defined costs incurred plus a fee or mark-up. The contracts may also include incentives for various performance criteria, including quality, timeliness, ingenuity, safety and cost-effectiveness. In addition, our costs are generally subject to review by our clients and regulatory audit agencies, and such reviews could result in costs being disputed as non-reimbursable under the terms of the contract. Revenue for cost-plus contracts is recognized at the time services are performed based upon the amounts we expect to realize using the percentage-of-completion method. Revenue is not recognized for non-recoverable costs. Performance incentives are included in our estimates of revenue when their realization is reasonably assured.

              If estimated total costs on any contract indicate a loss, we recognize the entire estimated loss in the period the loss becomes known. The cumulative effect of revisions to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses and others are recorded in the period in which the revisions are identified and the loss can be reasonably estimated. Such revisions could occur in any reporting period and the effects may be material depending on the size of the project or the adjustment.

              Once contract performance is underway, we may experience changes in conditions, client requirements, specifications, designs, materials and expectations regarding the period of performance. Such changes are "change orders" and may be initiated by us or by our clients. In many cases, agreement with the client as to the terms of change orders is reached prior to work commencing; however, sometimes circumstances require that work progress without obtaining client agreement. Revenue related to change orders is recognized as costs are incurred. Change orders that are unapproved as to both price and scope are evaluated as claims.

              Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs. Revenue on claims is recognized only to the extent that contract costs related to the claims have been incurred and when it is probable that the claim will result in a bona fide addition to contract value that can be reliably estimated. No profit is recognized on a claim until final settlement occurs. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained or a claim resolution occurs.

Insurance Matters, Litigation and Contingencies

              In the normal course of business, we are subject to certain contractual guarantees and litigation. Generally, such guarantees relate to project schedules and performance. Most of the litigation involves us as a defendant in contractual disagreements, workers' compensation, personal injury and other similar lawsuits. We maintain insurance coverage for various aspects of our business and operations. However, we have elected to retain a portion of losses that may occur through the use of various deductibles, limits and retentions under our insurance programs. This practice may subject us to some future liability for which we are only partially insured or are completely uninsured.

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              We record in our consolidated balance sheets amounts representing our estimated liability for self-insurance claims. We utilize actuarial analyses to assist in determining the level of accrued liabilities to establish for our employee medical and workers' compensation self-insurance claims that are known and have been asserted against us, as well as for self-insurance claims that are believed to have been incurred based on actuarial analyses but have not yet been reported to our claims administrators at the balance sheet date. We include any adjustments to such insurance reserves in our consolidated results of operations.

              Except as described in Note 17, "Commitments and Contingencies" of the "Notes to Consolidated Financial Statements" included in Item 8, we do not have any litigation or other contingencies that have had, or are currently anticipated to have, a material impact on our results of operations or financial position. As additional information about current or future litigation or other contingencies becomes available, management will assess whether such information warrants the recording of additional expenses relating to those contingencies. Such additional expenses could potentially have a material impact on our results of operations and financial position.

Stock-Based Compensation

              Our stock-based compensation plans include stock options, restricted stock, restricted stock units ("RSUs") and an employee stock purchase plan for our eligible employees and outside directors. Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period. Determining the fair value of stock-based awards at the grant date requires management to make assumptions and apply judgment to determine the fair value of our awards. These assumptions and judgments include future employee turnover rates, along with estimating the future volatility of our stock price, future stock option exercise behaviors and, for performance-based awards, the achievement of company performance goals. Our stock-based compensation expense was $8.8 million, $10.8 million and $10.6 million for fiscal 2013, 2012 and 2011, respectively.

Goodwill and Intangibles

              The cost of an acquired company is assigned to the tangible and intangible assets purchased and the liabilities assumed on the basis of their fair values at the date of acquisition. The determination of fair values of assets and liabilities acquired requires us to make estimates and use valuation techniques when a market value is not readily available. Any excess of purchase price over the fair value of net tangible and intangible assets acquired is allocated to goodwill. Goodwill typically represents the value paid for the assembled workforce and enhancement of our service offerings.

              Identifiable intangible assets include backlog, non-compete agreements, client relations, trade names, patents and other assets. The costs of these intangible assets are amortized over their contractual or economic lives, which range from one to ten years. We assess the recoverability of the unamortized balance of our intangible assets when indicators of impairment are present based on expected future profitability and undiscounted expected cash flows and their contribution to our overall operations. Should the review indicate that the carrying value is not fully recoverable, the excess of the carrying value over the fair value of the intangible assets would be recognized as an impairment loss.

              We perform our annual goodwill impairment review at the beginning of our fiscal fourth quarter. Our annual review at July 1, 2013 (i.e., the first day of our fiscal fourth quarter), indicated that we had no impairment of goodwill, and all of our reporting units had estimated fair values that were in excess of their carrying values, including goodwill. During our annual impairment review, we identified three reporting units in the ECS segment with goodwill totaling $216 million that had a fair value in excess of carrying value equal to or less than 20%. In the third quarter of fiscal 2013, the goodwill of each of these reporting

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units was written down to estimated fair value through an impairment charge. In addition, we regularly evaluate whether events and circumstances have occurred that may indicate a potential change in recoverability of goodwill. We perform interim goodwill impairment reviews between our annual reviews if certain events and circumstances have occurred, including a deterioration in general economic conditions, an increased competitive environment, a change in management, key personnel, strategy or customers, negative or declining cash flows, or a decline in actual or planned revenue or earnings compared with actual and projected results of relevant prior periods (see Note 6, "Goodwill and Intangible Assets" of the "Notes to Consolidated Financial Statements" in Item 8 for further discussion).

              We believe the methodology that we use to review impairment of goodwill, which includes a significant amount of judgment and estimates, provides us with a reasonable basis to determine whether impairment has occurred. However, many of the factors employed in determining whether our goodwill is impaired are outside of our control and it is reasonably likely that assumptions and estimates will change in future periods. These changes could result in future impairments.

              The goodwill impairment review involves the determination of the fair value of our reporting units, which for us are the components one level below our reportable segments. This process requires us to make significant judgments and estimates, including assumptions about our strategic plans with regard to our operations as well as the interpretation of current economic indicators and market valuations. Furthermore, the development of the present value of future cash flow projections includes assumptions and estimates derived from a review of our expected revenue growth rates, profit margins, business plans, cost of capital and tax rates. We also make certain assumptions about future market conditions, market prices, interest rates and changes in business strategies. Changes in assumptions or estimates could materially affect the determination of the fair value of a reporting unit. This could eliminate the excess of fair value over carrying value of a reporting unit entirely and, in some cases, result in impairment. Such changes in assumptions could be caused by a loss of one or more significant contracts, reductions in government or commercial client spending, or a decline in the demand for our services due to changing economic conditions. In the event that we determine that our goodwill is impaired, we would be required to record a non-cash charge that could result in a material adverse effect on our results of operations or financial position.

              We use two methods to determine the fair value of our reporting units: (i) the Income Approach and (ii) the Market Approach. While each of these approaches is initially considered in the valuation of the business enterprises, the nature and characteristics of the reporting units indicate which approach is most applicable. The Income Approach utilizes the discounted cash flow method, which focuses on the expected cash flow of the reporting unit. In applying this approach, the cash flow available for distribution is calculated for a finite period of years. Cash flow available for distribution is defined, for purposes of this analysis, as the amount of cash that could be distributed as a dividend without impairing the future profitability or operations of the reporting unit. The cash flow available for distribution and the terminal value (the value of the reporting unit at the end of the estimation period) are then discounted to present value to derive an indication of the value of the business enterprise. The Market Approach is comprised of the guideline company method and the similar transactions method. The guideline company method focuses on comparing the reporting unit to select reasonably similar (or "guideline") publicly traded companies. Under this method, valuation multiples are (i) derived from the operating data of selected guideline companies; (ii) evaluated and adjusted based on the strengths and weaknesses of the reporting units relative to the selected guideline companies; and (iii) applied to the operating data of the reporting unit to arrive at an indication of value. In the similar transactions method, consideration is given to prices paid in recent transactions that have occurred in the reporting unit's industry or in related industries. For our annual impairment analysis at July 1, 2013, we weighted the Income Approach and the Market Approach at 70% and 30%, respectively. The Income Approach was given a higher weight because it has the most direct correlation to the specific economics of the reporting unit, as compared to the Market Approach, which is based on multiples of broad-based (i.e., less comparable) companies.

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              Contingent Consideration.    Certain of our acquisition agreements include contingent earn-out arrangements, which are generally based on the achievement of future operating income thresholds. The contingent earn-out arrangements are based upon our valuations of the acquired companies and reduce the risk of overpaying for acquisitions if the projected financial results are not achieved. For acquisitions completed prior to fiscal 2010, contingent earn-out payments are accrued as "Estimated earn-out liabilities" when the related operating income thresholds have been achieved, and a corresponding increase in goodwill is recorded. These contingent earn-out payments are reflected as cash flows used in investing activities on the consolidated statements of cash flows in the period paid.

              For acquisitions consummated in or after fiscal 2010, the fair values of these earn-out arrangements are included as part of the purchase price of the acquired companies on their respective acquisition dates. For each transaction, we estimate the fair value of contingent earn-out payments as part of the initial purchase price and record the estimated fair value of contingent consideration as a liability in "Estimated contingent earn-out liabilities" and "Other long-term liabilities" on the consolidated balance sheets. We consider several factors when determining that contingent earn-out liabilities are part of the purchase price, including the following: (1) the valuation of our acquisitions is not supported solely by the initial consideration paid, and the contingent earn-out formula is a critical and material component of the valuation approach to determining the purchase price; and (2) the former shareholders of acquired companies that remain as key employees receive compensation other than contingent earn-out payments at a reasonable level compared with the compensation of our other key employees. The contingent earn-out payments are not affected by employment termination.

              We measure our contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy (See Note 2, "Basis of Presentation and Preparation – Fair Value of Financial Instruments" of the "Notes to Consolidated Financial Statements" included in Item 8). We use a probability weighted discounted income approach as a valuation technique to convert future estimated cash flows to a single present value amount. The significant unobservable inputs used in the fair value measurements are operating income projections over the earn-out period (generally two or three years), and the probability outcome percentages we assign to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liability will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. The amount paid that is less than or equal to the liability on the acquisition date is reflected as cash used in financing activities in our consolidated statements of cash flows. Any amount paid in excess of the liability on the acquisition date is reflected as cash used in operating activities.

              We review and re-assess the estimated fair value of contingent consideration on a quarterly basis, and the updated fair value could differ materially from the initial estimates. Changes in the estimated fair value of our contingent earn-out liabilities related to the time component of the present value calculation are reported in interest expense. Adjustments to the estimated fair value related to changes in all other unobservable inputs are reported in operating income.

Income Taxes

              We file a consolidated U.S. federal income tax return and a combined California franchise tax return. In addition, we file other returns that are required in the states, foreign jurisdictions and other jurisdictions in which we do business. We account for certain income and expense items differently for financial reporting and income tax purposes. Deferred tax assets and liabilities are computed for the differences between the financial statement and tax bases of assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to reverse. In determining the need for a valuation allowance on deferred tax

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assets, management reviews both positive and negative evidence, including current and historical results of operations, future income projections and potential tax planning strategies. Based on our assessment, we have concluded that a portion of the deferred tax assets at September 29, 2013 will not be realized.

              According to the authoritative guidance on accounting for uncertainty in income taxes, we may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position should be measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. For more information related to our unrecognized tax benefits, see Note 8, "Income Taxes" of the "Notes to Consolidated Financial Statements" included in Item 8.

RECENT ACCOUNTING PRONOUNCEMENTS

              For a discussion of recent accounting standards and the effect they could have on the consolidated financial statements, see Note 2, "Basis of Presentation and Preparation" of the "Notes to Consolidated Financial Statements" included in Item 8.

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk

              We do not enter into derivative financial instruments for trading or speculation purposes. In the normal course of business, we have exposure to both interest rate risk and foreign currency transaction and translation risk, primarily related to the Canadian dollar ("CAD").

              We are exposed to interest rate risk under our Amended Credit Agreement. We can borrow, at our option, under both the Term Loan Facility and Revolving Credit Facility. We may borrow on the Revolving Credit Facility, at our option, at either (a) a Eurocurrency rate plus a margin that ranges from 1.15% to 2.00% per annum, or (b) a base rate for loans in U.S. dollars (the highest of the U.S. federal funds rate plus 0.50% per annum, the bank's prime rate or the Eurocurrency rate plus 1.00%) plus a margin that ranges from 0.15% to 1.00% per annum. Borrowings at the base rate have no designated term and may be repaid without penalty any time prior to the Facility's maturity date. Borrowings at a Eurodollar rate have a term no less than 30 days and no greater than 90 days. Typically, at the end of such term, such borrowings may be rolled over at our discretion into either a borrowing at the base rate or a borrowing at a Eurodollar rate with similar terms, not to exceed the maturity date of the Facility. The Facility matures on May 7, 2018. At September 29, 2013 we had borrowings outstanding under the Amended Credit Agreement of $205.0 million at a weighted-average interest rate of 1.56%, of which the entire amount was outstanding under the Term Loan Facility.

              In fiscal 2013, we entered into three interest rate swap agreements with three banks to fix the variable interest rate on $153.8 million of our Term Loan Facility. The objective of these interest rate swaps was to eliminate the variability of our cash flows on the amount of interest expense we pay under our Amended Credit Facility. Our average effective interest rate on borrowings outstanding under the Amended Credit Agreement, including the effects of interest rate swap agreements, at September 29, 2013 was 2.43%. For more information, see Note 14, "Derivative Financial Instruments" of the "Notes to Consolidated Financial Statements" in Item 8. In October 2013, we entered into two interest rate swap agreements with two banks to fix the variable interest rate on $51.2 million of our Term Loan Facility, resulting in an effective interest rate at existing Eurocurrency rate pricing margins of 2.7% on the entire Term Loan Facility.

              Most of our transactions are in U.S. dollars; however, some of our subsidiaries conduct business in foreign currencies, primarily the CAD. Therefore, we are subject to currency exposure and volatility because of currency fluctuations. We attempt to minimize our exposure to these fluctuations by matching

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revenue and expenses in the same currency for our contracts. For fiscal 2013, we recognized foreign currency losses of $0.8 million compared to gains of $0.1 million for the prior year. Foreign currency gains and losses were recognized as part of "Selling, general and administrative expenses" in our consolidated statements of operations.

              We have foreign currency exchange rate exposure in our results of operations and equity primarily as a result of the currency translation related to our Canadian subsidiaries where the local currency is the functional currency. To the extent the U.S. dollar strengthens against the CAD, the translation of these foreign currency denominated transactions will result in reduced revenue, operating expenses, assets and liabilities. Similarly, our revenue, operating expenses, assets and liabilities will increase if the U.S. dollar weakens against the CAD. For fiscal 2013 and 2012, 26.7% and 24.5% of our consolidated revenue, respectively, was generated by our international business, and such revenue was primarily denominated in CAD. For fiscal 2013, the effect of foreign exchange rate translation on the consolidated balance sheets was a reduction in equity of $29.2 million compared to an increase in equity of $26.3 million in fiscal 2012. These amounts were recognized as an adjustment to equity through other comprehensive income.

              In fiscal 2009, we entered into an intercompany promissory note with a wholly-owned Canadian subsidiary in connection with the acquisition of Wardrop Engineering, Inc. The intercompany note receivable is denominated in CAD and has a fixed rate of interest payable in CAD. In the second quarter of fiscal 2010, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $3.9 million at the date of inception) that matured on January 28, 2013. In the third quarter of fiscal 2011, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $4.2 million at the date of inception) with a maturity date of January 27, 2014. Our objective was to eliminate variability of our cash flows on the amount of interest income we receive on the promissory note from changes in foreign currency exchange rates. In the second quarter of fiscal 2013, we settled one of the foreign currency forward contracts for U.S. $3.9 million and terminated the remaining forward contract. For more information, see Note 14, "Derivative Financial Instruments" of the "Notes to Consolidated Financial Statements" in Item 8.

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Item 8.    Financial Statements and Supplementary Data

INDEX TO FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULE

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders of Tetra Tech, Inc.:

              In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of operations, comprehensive income (loss), equity and cash flows present fairly, in all material respects, the financial position of Tetra Tech, Inc. and its subsidiaries at September 29, 2013 and September 30, 2012, and the results of their operations and their cash flows for each of the three years in the period ended September 29, 2013, in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of September 29, 2013 based on criteria established in Internal Control – Integrated Framework (1992) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for these financial statements and the financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Report on Internal Control over Financial Reporting, appearing under Item 9A of this Form 10-K. Our responsibility is to express opinions on these financial statements, on the financial statement schedule and on the Company's internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

              A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

              Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PRICEWATERHOUSECOOPERS LLP

Los Angeles, California
November 20, 2013

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TETRA TECH, INC.
Consolidated Balance Sheets
(in thousands, except par value)

See accompanying Notes to Consolidated Financial Statements.

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TETRA TECH, INC.
Consolidated Statements of Operations
(in thousands, except per share data)

See accompanying Notes to Consolidated Financial Statements.

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TETRA TECH, INC.
Consolidated Statements of Comprehensive Income (Loss)
(unaudited – in thousands)

See accompanying Notes to Consolidated Financial Statements.

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TETRA TECH, INC.
Consolidated Statements of Equity
Fiscal Years Ended October 2, 2011, September 30, 2012, and September 29, 2013
(in thousands)

See accompanying Notes to Consolidated Financial Statements.

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TETRA TECH, INC.
Consolidated Statements of Cash Flows
(in thousands)

See accompanying Notes to Consolidated Financial Statements.

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.           Description of Business

              We are a leading provider of consulting, engineering, program management, construction management, construction and technical services that focuses on addressing fundamental needs for water, the environment, energy, infrastructure and natural resources. We are a full-service company that leads with science. We typically begin at the earliest stage of a project by identifying technical solutions to problems and developing execution plans tailored to our clients' needs and resources. Our solutions may span the entire life cycle of consulting and engineering projects and include applied science, research and technology, engineering, design, construction management, construction, operations and maintenance, and information technology.

2.           Basis of Presentation and Preparation

              Principles of Consolidation and Presentation.    The consolidated financial statements include our accounts and those of joint ventures of which we are the primary beneficiary. Certain prior year amounts for Tetra Tech, Inc. and its reportable segments have been revised to conform to the current year presentation. In the first quarter of fiscal 2013, we implemented a reorganization of our operations to improve future growth and profitability, including the consolidation and realignment of certain operating activities to achieve efficiencies in our segment management. This reorganization included the elimination of the EAS reportable segment, and the re-assignment of its operations to the ECS and TSS segments (see Note 18, "Reportable Segments" for further discussion). All significant intercompany balances and transactions have been eliminated in consolidation.

              Fiscal Year.    We report results of operations based on 52 or 53-week periods ending on the Sunday nearest September 30. Fiscal years 2013, 2012 and 2011 each contained 52 weeks.

              Use of Estimates.    The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions. These estimates and assumptions affect the amounts reported in our consolidated financial statements and accompanying notes. Although such estimates and assumptions are based on management's best knowledge of current events and actions we may take in the future, actual results could differ materially from those estimates.

              Revenue Recognition and Contract Costs.    We recognize revenue for most of our contracts using the percentage-of-completion method, primarily based on contract costs incurred to date compared to total estimated contract costs. We generally utilize the cost-to-cost approach to estimate the progress towards completion in order to determine the amount of revenue and profit to recognize. Revenue and cost estimates for each significant contract are reviewed and reassessed quarterly. Changes in those estimates could result in recognition of cumulative catch-up adjustments to the contract's inception-to-date revenue, costs and profit in the period in which such changes are made. Changes in revenue and cost estimates could also result in a projected loss that would be recorded immediately in earnings. For fiscal years 2013, 2012 and 2011, we recognized net favorable (unfavorable) operating income adjustments of ($40.1) million, $0.5 million and ($8.6) million, respectively, due to changes in estimates.

              Certain of our contracts are service-related contracts, such as providing operations and maintenance services or a variety of technical assistance services. Our service contracts are accounted for using the proportional performance method under which revenue is recognized in proportion to the number of service activities performed, in proportion to the direct costs of performing the service activities, or evenly across the period of performance depending upon the nature of the services provided.

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

2.           Basis of Presentation and Preparation (Continued)

              We recognize revenue for work performed under three major types of contracts: fixed-price, time-and-materials and cost-plus.

              Fixed-Price.    We enter into two major types of fixed-price contracts: FFP and FPPU. Under FFP contracts, our clients pay us an agreed fixed-amount negotiated in advance for a specified scope of work. We generally recognize revenue on FFP contracts using the percentage-of-completion method. If the nature or circumstances of the contract prevent us from preparing a reliable estimate at completion, we will delay profit recognition until adequate information about the contract's progress becomes available. Under our FPPU contracts, clients pay us a set fee for each service or production transaction that we complete. Accordingly, we recognize revenue under FPPU contracts as we complete the related service or production transactions, generally using the proportional performance method.

              Time-and-Materials.    Under time-and-materials contracts, we negotiate hourly billing rates and charge our clients based on the actual time that we spend on a project. In addition, clients reimburse us for our actual out-of-pocket costs for materials and other direct incidental expenditures that we incur in connection with our performance under the contract. The majority of our time-and-material contracts are subject to maximum contract values and, accordingly, revenue under these contracts is generally recognized under the percentage-of-completion method. However, time and materials contracts that are service-related contracts are accounted for utilizing the proportional performance method. Revenue on contracts that are not subject to maximum contract values is recognized based on the actual number of hours we spend on the projects plus any actual out-of-pocket costs of materials and other direct incidental expenditures that we incur on the projects. Our time-and-materials contracts also generally include annual billing rate adjustment provisions.

              Cost-Plus.    Under cost-plus contracts, we are reimbursed for allowable or otherwise defined costs incurred plus a fee or mark-up. The contracts may also include incentives for various performance criteria, including quality, timeliness, ingenuity, safety and cost-effectiveness. In addition, our costs are generally subject to review by our clients and regulatory audit agencies, and such reviews could result in costs being disputed as non-reimbursable under the terms of the contract. Revenue for cost-plus contracts is recognized at the time services are performed based upon the amounts we expect to realize using the percentage-of-completion method. Revenue is not recognized for non-recoverable costs. Performance incentives are included in our estimates of revenue when their realization is reasonably assured.

              If estimated total costs on any contract indicate a loss, we recognize the entire estimated loss in the period the loss becomes known. The cumulative effect of revisions to revenue; estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, liquidated damages, anticipated losses, and other revisions are recorded in the period in which the revisions are identified and the loss can be reasonably estimated. Such revisions could occur in any reporting period and the effects may be material depending on the size of the project or the adjustment.

              Once contract performance is underway, we may experience changes in conditions, client requirements, specifications, designs, materials and expectations regarding the period of performance. Such changes are "change orders" and may be initiated by us or by our clients. In many cases, agreement with the client as to the terms of change orders is reached prior to work commencing; however, sometimes circumstances require that work progress without obtaining client agreement. Revenue related to change

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

2.           Basis of Presentation and Preparation (Continued)

orders is recognized as costs are incurred. Change orders that are unapproved as to both price and scope are evaluated as claims.

              Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price, or other causes of unanticipated additional costs. Revenue on claims is recognized only to the extent that contract costs related to the claims have been incurred and when it is probable that the claim will result in a bona fide addition to contract value that can be reliably estimated. No profit is recognized on a claim until final settlement occurs. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained or a claims resolution occurs.

              Cash and Cash Equivalents.    Cash and cash equivalents include all highly liquid investments with maturities of 90 days or less at the date of purchase. Restricted cash of $4.5 million and $5.0 million was included in "Prepaid expenses and other current assets" on consolidated balance sheets at fiscal 2013 and 2012 year-ends, respectively. For cash held by our consolidated joint ventures, see Note 16, "Joint Ventures."

              Insurance Matters, Litigation and Contingencies.    In the normal course of business, we are subject to certain contractual guarantees and litigation. In addition, we maintain insurance coverage for various aspects of our business and operations. We record in our consolidated balance sheets amounts representing our estimated liability for these legal and insurance obligations. We include any adjustments to these liabilities in our consolidated results of operations.

              Accounts Receivable – Net.    Net accounts receivable is primarily comprised of billed and unbilled accounts receivable, contract retentions and allowances for doubtful accounts. Billed accounts receivable represent amounts billed to clients that have not been collected. Unbilled accounts receivable represent revenue recognized but not yet billed pursuant to contract terms or billed after the period end date. Most of our unbilled receivables at September 29, 2013 are expected to be billed and collected within 12 months. Unbilled accounts receivable also include amounts related to requests for equitable adjustment to contracts that provide for price redetermination primarily with the U.S. federal government. These amounts are recorded only when they can be reliably estimated and realization is probable. Contract retentions represent amounts withheld by clients until certain conditions are met or the project is completed, which may be several months or years. Allowances for doubtful accounts represent the amounts that may become uncollectible or unrealizable in the future. We determine an estimated allowance for uncollectible accounts based on management's judgment regarding our operating performance related to the adequacy of the services performed and delivered, the status of change orders and claims, our experience settling change orders and claims, and the financial condition of our clients. Billings in excess of costs on uncompleted contracts represent the amounts of cash collected from clients and billings to clients on contracts in advance of work performed and revenue recognized. The majority of these amounts will be earned within 12 months.

              Property and Equipment.    Property and equipment are recorded at cost and are depreciated over their estimated useful lives using the straight-line method. When property and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from our consolidated balance sheets and any resulting gain or loss is reflected in our consolidated statements of operations. Expenditures

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

2.           Basis of Presentation and Preparation (Continued)

for maintenance and repairs are expensed as incurred. Generally, estimated useful lives range from three to ten years for equipment, furniture and fixtures. Buildings are depreciated over periods not exceeding 40 years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the length of the lease.

              Long-Lived Assets.    Our policy regarding long-lived assets is to evaluate the recoverability of our assets when the facts and circumstances suggest that the assets may be impaired. This assessment is performed based on the estimated undiscounted cash flows compared to the carrying value of the assets. If the future cash flows (undiscounted and without interest charges) are less than the carrying value, a write-down would be recorded to reduce the related asset to its estimated fair value.

              We recognize a liability for contract termination costs associated with an exit activity for costs that will continue to be incurred under a lease for its remaining term without economic benefit to us, initially measured at its fair value at the cease-use date. The fair value is determined based on the remaining lease rentals, adjusted for the effects of any prepaid or deferred items recognized under the lease, and reduced by estimated sublease rentals.

              Business Combinations.    The cost of an acquired company is assigned to the tangible and intangible assets purchased and the liabilities assumed on the basis of their fair values at the date of acquisition. The determination of fair values of assets and liabilities acquired requires us to make estimates and use valuation techniques when a market value is not readily available. Any excess of purchase price over the fair value of net tangible and intangible assets acquired is allocated to goodwill. Goodwill typically represents the value paid for the assembled workforce and enhancement of our service offerings. Transaction costs associated with business combinations are expensed as they are incurred.

              Goodwill and Intangible Assets.    Goodwill represents the excess of the aggregate purchase price over the fair value of the net assets acquired in a business acquisition. Following an acquisition, we perform an analysis to value the acquired company's tangible and identifiable intangible assets and liabilities. With respect to identifiable intangible assets, we consider backlog, non-compete agreements, client relations, trade names, patents and other assets. We amortize our intangible assets based on the period over which the contractual or economic benefits of the intangible assets are expected to be realized. We assess the recoverability of the unamortized balance of our intangible assets when indicators of impairment are present based on expected future profitability and undiscounted expected cash flows and their contribution to our overall operations. Should the review indicate that the carrying value is not fully recoverable, the excess of the carrying value over the fair value of the intangible assets would be recognized as an impairment loss.

              We test our goodwill for impairment on an annual basis, and more frequently when an event occurs or circumstances indicate that the carrying value of the asset may not be recoverable. We believe the methodology that we use to review impairment of goodwill, which includes a significant amount of judgment and estimates, provides us with a reasonable basis to determine whether impairment has occurred. However, many of the factors employed in determining whether our goodwill is impaired are outside of our control and it is reasonably likely that assumptions and estimates will change in future periods. These changes could result in future impairments.

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2.           Basis of Presentation and Preparation (Continued)

              We perform our annual goodwill impairment review at the beginning of our fiscal fourth quarter. Our last annual review at July 1, 2013 (i.e., the first day of our fiscal fourth quarter), indicated that we had no impairment of goodwill, and all of our reporting units had estimated fair values that were in excess of their carrying values, including goodwill. In addition, we regularly evaluate whether events and circumstances have occurred that may indicate a potential change in recoverability of goodwill. We perform interim goodwill impairment reviews between our annual reviews if certain events and circumstances have occurred, including a deterioration in general economic conditions, an increased competitive environment, a change in management, key personnel, strategy or customers, negative or declining cash flows, or a decline in actual or planned revenue or earnings compared with actual and projected results of relevant prior periods (See Note 6, "Goodwill and Intangible Assets" for further discussion). We assess goodwill for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment, referred to as a component. Our operating segments are the same as our reportable segments and our reporting units for goodwill impairment testing are the components one level below our reportable segments. These components constitute a business for which discrete financial information is available and where segment management regularly reviews the operating results of that component. We aggregate components within an operating segment that have similar economic characteristics.

              The impairment test for goodwill is a two-step process involving the comparison of the estimated fair value of each reporting unit to the reporting unit's carrying value, including goodwill. We estimate the fair value of reporting units based on a comparison and weighting of the income approach, specifically the discounted cash flow method and the market approach, which estimates the fair value our reporting units based upon comparable market prices and recent transactions and also validates the reasonableness of the multiples from the income approach. If the fair value of a reporting unit exceeds its carrying amount, the goodwill of the reporting unit is not considered impaired; therefore, the second step of the impairment test is unnecessary. If the carrying amount of a reporting unit exceeds its fair value, we perform the second step of the goodwill impairment test to measure the amount of impairment loss to be recorded. If our goodwill is impaired, we are required to record a non-cash charge that could have a material adverse effect on our consolidated financial statements.

              Contingent Consideration.    Most of our acquisition agreements include contingent earn-out arrangements, which are generally based on the achievement of future operating income thresholds. The contingent earn-out arrangements are based upon our valuations of the acquired companies and reduce the risk of overpaying for acquisitions if the projected financial results are not achieved. For acquisitions completed prior to fiscal 2010, contingent earn-out payments are accrued as "Estimated earn-out liabilities" when the related operating income thresholds have been achieved, and a corresponding increase in goodwill is recorded. These contingent earn-out payments are reflected as cash flows used in investing activities on the consolidated statements of cash flows in the period paid. At September 29, 2013, there was no contingent consideration remaining for acquisitions completed prior to fiscal 2010 that would be recorded as an addition to goodwill, if earned.

              For acquisitions consummated during or subsequent to fiscal 2010, the fair values of these earn-out arrangements are included as part of the purchase price of the acquired companies on their respective acquisition dates. For each transaction, we estimate the fair value of contingent earn-out payments as part of the initial purchase price and record the estimated fair value of contingent consideration as a liability in "Estimated contingent earn-out liabilities" and "Long-term estimated

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contingent earn-out liabilities" on the consolidated balance sheets. We consider several factors when determining that contingent earn-out liabilities are part of the purchase price, including the following: (1) the valuation of our acquisitions is not supported solely by the initial consideration paid, and the contingent earn-out formula is a critical and material component of the valuation approach to determining the purchase price; and (2) the former owners of acquired companies that remain as key employees receive compensation other than contingent earn-out payments at a reasonable level compared with the compensation of our other key employees. The contingent earn-out payments are not affected by employment termination.

              We measure our contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy. We use a probability weighted discounted income approach as a valuation technique to convert future estimated cash flows to a single present value amount. The significant unobservable inputs used in the fair value measurements are operating income projections over the earn-out period (generally two or three years), and the probability outcome percentages we assign to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liability will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. The amount paid that is less than or equal to the liability on the acquisition date is reflected as cash used in financing activities in our consolidated statements of cash flows. Any amount paid in excess of the liability on the acquisition date is reflected as cash used in operating activities.

              We review and re-assess the estimated fair value of contingent consideration on a quarterly basis, and the updated fair value could differ materially from the initial estimates. Changes in the estimated fair value of our contingent earn-out liabilities related to the time component of the present value calculation are reported in interest expense. Adjustments to the estimated fair value related to changes in all other unobservable inputs are reported in operating income.

              Assets Held for Sale.    Assets that meet the held for sale classification criteria are valued at the lower of their carrying amount or estimated fair value less cost to sell. If the carrying amount of the asset exceeds its estimated fair value less cost to sell, an impairment loss is recognized. Depreciation, depletion and amortization expense is not recorded on assets once they are classified as held for sale.

              Fair Value of Financial Instruments.    We determine the fair values of our financial instruments, including short-term investments, debt instruments and derivative instruments based on inputs or assumptions that market participants would use in pricing an asset or a liability. We categorize our instruments using a valuation hierarchy for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; and Level 3 inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The classification of a financial asset or liability within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

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2.           Basis of Presentation and Preparation (Continued)

              The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair values based on their short-term nature. The carrying amounts of our revolving credit facility approximates fair value because the interest rates are based upon variable reference rates (see Note 9, "Long-Term Debt" and Note 14, "Derivative Financial Instruments" for additional disclosure). Certain other assets and liabilities, such as contingent earn-out liabilities, assets held for sale and amounts related to cash-flow hedges, are required to be carried in our consolidated financial statements at fair value.

              Our fair value measurement methods may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although we believe our valuation methods are appropriate and consistent with those used by other market participants, the use of different methodologies or assumptions to determine fair value could result in a different fair value measurement at the reporting date.

              Derivative Financial Instruments.    We account for our derivative instruments as either assets or liabilities and carry them at fair value. For derivative instruments that hedge the exposure to variability in expected future cash flows that are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in stockholders' equity and reclassified into income in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in current income. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions.

              The net gain or loss on the effective portion of a derivative instrument that is designated as an economic hedge of the foreign currency translation exposure generated by the re-measurement of certain assets and liabilities denominated in a non-functional currency in a foreign operation is reported in the same manner as a foreign currency translation adjustment. Accordingly, any gains or losses related to these derivative instruments are recognized in current income. Derivatives that do not qualify as hedges are adjusted to fair value through current income.

              Deferred Compensation.    We maintain a non-qualified defined contribution supplemental retirement plan for certain key employees that is accounted for in accordance with applicable authoritative guidance on accounting for deferred compensation arrangements where amounts earned are held in a rabbi trust and invested. Employee deferrals and our match are deposited into a rabbi trust, and the funds are generally invested in individual variable life insurance contracts that we own and are specifically designed to informally fund savings plans of this nature. Our consolidated balance sheets reflect our investment in variable life insurance contracts in "Other long-term assets." Our obligation to participating employees is reflected in "Other long-term liabilities." All income and expenses related to the rabbi trust are reflected in our consolidated statements of operations.

              Income Taxes.    We file a consolidated U.S. federal income tax return and a combined California franchise tax return. In addition, we file other returns that are required in the states, foreign jurisdictions and other jurisdictions in which we do business. We account for certain income and expense items differently for financial reporting and income tax purposes. Deferred tax assets and liabilities are computed for the difference between the financial statement and tax bases of assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to reverse. In determining the need for a valuation

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2.           Basis of Presentation and Preparation (Continued)

allowance, management reviews both positive and negative evidence, including current and historical results of operations, future income projections and potential tax planning strategies. Based on our assessment, we have concluded that a portion of the deferred tax assets at September 29, 2013 will not be realized.

              According to the authoritative guidance on accounting for uncertainty in income taxes, we may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position should be measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. This guidance also addresses de-recognition, classification, interest and penalties on income taxes, accounting in interim periods and disclosure requirements for uncertain tax positions.

              In the fourth quarter of fiscal 2013, we identified and corrected errors relating to prior years that increased both income tax expense and our net loss for the year by $3.3 million. The out-of-period adjustments related to book versus tax valuations of fixed assets and acquired intangible assets. Had all adjustments been recorded in their appropriate periods, net loss attributable to Tetra Tech for fiscal 2013 would have increased to net income of $1.1 million. We do not believe that the accounting errors are material to our 2013 annual results or to our previously issued annual or interim financial statements. As a result, we did not adjust any prior period amounts.

              Concentration of Credit Risk.    Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents and net accounts receivable. In the event that we have surplus cash, we place our temporary cash investments with lower risk financial institutions and, by policy, limit the amount of investment exposure to any one financial institution. Approximately 22% of accounts receivable were due from various agencies of the U.S. federal government at fiscal 2013 year-end. The remaining accounts receivable are generally diversified due to the large number of organizations comprising our client base and their geographic dispersion. We perform ongoing credit evaluations of our clients and maintain an allowance for potential credit losses. Approximately 47%, 26% and 27% of our fiscal 2013 revenue was generated from our U.S government, U.S. commercial and international clients, respectively (see Note 18, "Reportable Segments" for more information).

              Foreign Currency Translation.    We determine the functional currency of our foreign operating units based upon the primary currency in which they operate. These operating units maintain their accounting records in their local currency, primarily CAD. Where the functional currency is not the U.S. dollar, translation of assets and liabilities to U.S. dollars is based on exchange rates at the balance sheet date. Translation of revenue and expenses to U.S. dollars is based on the average rate during the period. Translation gains or losses are reported as a component of other comprehensive income (loss). Gains or losses from foreign currency transactions are included in results of operations, with the exception of intercompany foreign transactions that are considered long-term investments, which are recorded in "Accumulated other comprehensive income" on the consolidated balance sheets.

              Recently Adopted and Issued Accounting Guidance.    In June 2011, the Financial Accounting Standards Board ("FASB") issued new guidance on the presentation of comprehensive income. We are required to present components of net income and other comprehensive income in either one single continuous statement or in two separate consecutive statements. This guidance was effective for us in the first quarter of fiscal 2013 and it did not have an impact on our consolidated financial statements.

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2.           Basis of Presentation and Preparation (Continued)

              In September 2011, the FASB issued updated guidance to simplify goodwill impairment testing. The amendment permits us to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. The guidance was effective for us in July 2013 when we perform our annual goodwill impairment test. This guidance did not have an impact on our consolidated financial statements.

              In December 2011, the FASB issued new guidance to enhance disclosures about financial instruments and derivative instruments that are either offset on the statement of financial position or subject to an enforceable master netting arrangement or similar agreement, irrespective of whether they are offset on the statement of financial position. We are required to provide both net and gross information for these assets and liabilities in order to facilitate comparability between financial statements prepared on the basis of U.S. GAAP and financial statements prepared on the basis of International Financial Reporting Standards. This guidance will be effective for us in the first quarter of fiscal 2014 on a retrospective basis. We are currently evaluating the impact on our consolidated financial statements.

              In February 2013, the FASB issued an update to the reporting of reclassifications out of accumulated other comprehensive income. We are required to disclose additional information about changes in and significant items reclassified out of accumulated other comprehensive income. The guidance is effective for us in the first quarter of fiscal 2014. We do not expect the adoption of this guidance to have an impact on our consolidated financial statements.

              In July 2013, the FASB issued an update on an inclusion of the Fed Funds Effective Swap as a benchmark interest rate (Overnight Interest Swap Rate) for hedge accounting purposes. This guidance permits the Fed Funds Effective Swap Rate to be used as a U.S. benchmark interest rate for hedge accounting purposes under U.S. GAAP. This guidance will be effective prospectively for qualifying new or redesigned hedging relationships entered into on or after July 17, 2013. We do not expect a material impact to our consolidated financial statements.

              In July 2013, the FASB issued an update on the financial statement presentation of unrecognized tax benefits. We are required to present a liability related to an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. This guidance will be effective for us in the first quarter of fiscal 2015. We do not expect the adoption of this guidance to have an impact on our consolidated financial statements.

3.           Stock Repurchase Program

              In June 2013, our Board of Directors authorized the Stock Repurchase Program under which we may currently repurchase up to $100 million of Tetra Tech common stock. In November 2013, our Board of Directors amended the Stock Repurchase Program, effective on November 18, 2013, to revise the pricing parameters and to extend the program through fiscal 2014. Stock repurchases may be made on the open market or in privately negotiated transactions with third parties. Because the repurchases under the Stock Repurchase Program are subject to certain pricing parameters, there is no guarantee as to the exact number of shares that will be repurchased under the program. At September 29, 2013, we had repurchased through open market purchases a total of 855,200 shares at an average price of $23.39 per share, for a total cost of $20.0 million.

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4.           Accounts Receivable – Net

              Net accounts receivable and billings in excess of costs on uncompleted contracts consisted of the following at September 29, 2013 and September 30, 2012:

              Billed accounts receivable represent amounts billed to clients that have not been collected. Unbilled accounts receivable represent revenue recognized but not yet billed pursuant to contract terms or billed after the period end date. Most of our unbilled receivables at September 29, 2013 are expected to be billed and collected within 12 months. Contract retentions represent amounts withheld by clients until certain conditions are met or the project is completed, which may be several months or years. The allowance for doubtful accounts is determined based on a review of client-specific accounts, and contract issues resulting from current events and economic circumstances. Billings in excess of costs on uncompleted contracts represent the amount of cash collected from clients and billings to clients on contracts in advance of revenue recognized. The majority of billings in excess of costs on uncompleted contracts will be earned within 12 months. Non-current billings in excess of costs on uncompleted contracts are reported as part of our "Other long-term liabilities" on our consolidated balance sheets.

              Once contract performance is underway, we may experience changes in conditions, client requirements, specifications, designs, materials and expectations regarding the period of performance. Such changes result in "change orders" and may be initiated by us or by our clients. In many cases, agreement with the client as to the terms of change orders is reached prior to work commencing; however, sometimes circumstances require that work progresses without obtaining client agreement. Unapproved change orders constitute claims in excess of agreed contract prices that we seek to collect from our clients (or other third parties) for delays, errors in specifications and designs, contract terminations, or other causes of unanticipated additional costs. Revenue on claims is recognized when contract costs related to claims have been incurred and when their addition to contract value can be reliably estimated. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period such as when client agreement is obtained or a claims resolution occurs.

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4.           Accounts Receivable – Net (Continued)

              Unbilled accounts receivable at September 29, 2013 and September 30, 2012 include approximately $41 million and $21 million, respectively, related to claims, including requests for equitable adjustment, on contracts that provide for price redetermination, primarily with U.S. federal government agencies. We regularly evaluate these claim amounts and record appropriate adjustments to operating earnings when it is probable that the claim will result in a different contract value than the amount previously reliably estimated. We recognized losses of approximately $30.2 million related to the evaluation of collectability of claims in fiscal 2013 primarily related to contractual disputes with government clients. No losses related to claims were recognized in fiscal 2012.

              Billed accounts receivable related to U.S. federal government contracts were $50.5 million and $65.9 million at September 29, 2013 and September 30, 2012, respectively. U.S. federal government unbilled receivables, net of progress payments, were $79.3 million and $100.4 million at September 29, 2013 and September 30, 2012, respectively. Other than the U.S. federal government, no single client accounted for more than 10% of our accounts receivable at September 29, 2013 and September 30, 2012.

5.           Mergers and Acquisitions

              At the beginning of the first quarter of fiscal 2011, we acquired all of the outstanding capital stock of BPR, Inc. ("BPR"), a Canadian scientific and engineering services firm that provides multidisciplinary consulting and engineering support for water, energy, industrial plants, buildings and infrastructure projects. This acquisition further expanded our geographic presence in Eastern Canada, and enabled us to provide clients with additional services throughout Canada. BPR is part of our ECS segment. The estimated fair value of the purchase price was $185.7 million as of the acquisition date, of which payments of $157.0 million were financed with borrowings under our credit facility and available cash resources, and $28.7 million was the estimated fair value of contingent earn-out liabilities on acquisition with a maximum of $39.2 million upon the achievement of specified financial objectives over a two-year period from the acquisition date. The goodwill related to the BPR acquisition represented the value paid for the assembled work force, the international geographic presence in Eastern Canada, and engineering and consulting expertise. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition:

              In fiscal 2011, we made other acquisitions that enhanced our service offerings and expanded our geographic presence in the ECS and TSS segments. The aggregate purchase price for these acquisitions was approximately $100 million as of the respective acquisition dates. Of this amount, $68.7 million was

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5.           Mergers and Acquisitions (Continued)

paid to the sellers, $4.5 million was accrued in accordance to the purchase agreements, and $26.9 million was the estimated fair value of contingent earn-out obligations with an aggregate maximum of $32.3 million upon the achievement of specified financial objectives.

              In fiscal 2012, we made acquisitions that enhanced our service offerings and expanded our geographic presence in our ECS and TSS segments. The aggregate purchase price for these acquisitions was $63.2 million as of the respective acquisition dates. Of this amount, $42.2 million was paid to the sellers, $2.0 million was accrued in accordance to the purchase agreements, and $19.0 million was the estimated fair value of contingent earn-out obligations with an aggregate maximum of $20.0 million upon the achievement of specified financial objectives.

              On December 31, 2012, we acquired American Environmental Group, Ltd. ("AEG"), headquartered in Richfield, Ohio. AEG provides environmental, design, construction and maintenance services primarily to solid and hazardous waste, environmental, energy and utility clients. On January 28, 2013, we acquired Parkland Pipeline Contractors Ltd., Parkland Pipeline Equipment Ltd., Park L Projects Ltd. and Parkland Projects Ltd. (collectively, "Parkland"), headquartered in Alberta, Canada. Parkland serves the oil and gas industry in Western Canada, and specializes in the technical support, engineering support and construction of pipelines and oilfield facilities. AEG and Parkland are both included in our RCM segment. We also made other acquisitions that enhanced our service offerings and expanded our geographic presence in our ECS and TSS segments during fiscal 2013. The aggregate fair value of the purchase prices for fiscal 2013 acquisitions was $248.9 million. Of this amount, $171.6 million was paid to the sellers, $2.0 million was recorded as liabilities in accordance with the purchase agreements, and $75.3 million was the estimated fair value of contingent earn-out obligations, with an aggregate maximum of $86.7 million upon the achievement of specified financial objectives.

              Goodwill additions resulting from the above business combinations are primarily attributable to the existing workforce of the acquired companies and synergies expected to arise after the acquisitions. The results of these acquisitions were included on the consolidated financial statements from their respective closing dates. None of the acquisitions were considered material, individually or in the aggregate, for the respective reporting periods. As a result, no pro forma information has been provided. The purchase price allocations related to fiscal 2013 acquisitions are preliminary, and subject to adjustment, based on the valuation and final determination of net assets acquired. We do not believe that any adjustments will have a material effect on the consolidated results of operations.

              At September 29, 2013, there was a total maximum of $101.3 million of outstanding contingent consideration related to acquisitions completed during or subsequent to fiscal 2010. Of this amount,

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5.           Mergers and Acquisitions (Continued)

$81.8 million was estimated as the fair value and accrued on our consolidated balance sheet. The following table summarizes the changes in the carrying value of estimated contingent earn-out liabilities:

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6.           Goodwill and Intangible Assets

              The following table summarizes the changes in the carrying value of goodwill:

              Goodwill additions are primarily attributable to acquisitions described in Note 5, "Mergers and Acquisitions" for the respective fiscal years. Additionally, fiscal 2012 goodwill additions include earn-out payments associated with an acquisition consummated prior to fiscal 2010, which was accounted for as an increase to goodwill under previous accounting rules. Substantially all of the goodwill additions are not deductible for income tax purposes. Foreign exchange impact relates to our foreign subsidiaries with functional currencies that are different than our reporting currency. The gross amounts of goodwill, excluding accumulated impairment, for ECS were $413.2 million and $411.1 million for fiscal 2012 and 2013 year-ends, respectively.

              During the third quarter of fiscal 2013, certain of our reporting units experienced declines in their actual and projected financial performance. In Eastern Canada, poor economic conditions, including budget deficits, reduced customer spending, and an on-going government investigation into political corruption in Quebec slowed procurements and business activity in that region. In addition, our work for mining customers continued to slow at a faster pace than previously anticipated due to reduced demand and significant declines in prices for certain metals. To a lesser extent, we also experienced reduced performance from reporting units with a concentration of work for certain agencies of the U.S. federal government as a result of customer budgetary constraints. As a result of these factors, during the third quarter of fiscal 2013, we performed an interim goodwill impairment test for three reporting units in our ECS segment, as follows:

•

Tetra Tech Canada ("TTC"), with operations primarily in Eastern Canada, particularly Quebec;



•

Global Mining Practice ("GMP"), with operations primarily in the U.S., Canada, Australia and South America; and

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6.           Goodwill and Intangible Assets (Continued)

•

Advanced Management Technology, Inc. ("AMT"), a U.S. federal government contractor primarily doing business with the FAA.

              We performed the first step of the impairment test for each of these reporting units during the third quarter of fiscal 2013, and in each case determined that the carrying value of the reporting unit exceeded its fair value indicating potential goodwill impairment. The significant change to the assumptions used in the interim test in the third quarter of fiscal 2013 compared to the last annual impairment test as of July 2, 2012 was the projected revenue, operating income and cash flows for each reporting unit tested.

              We performed the second step of the goodwill impairment test to measure the amount of the impairment loss, if any, of the applicable reporting units. The second step of the test requires the allocation of the reporting unit's fair value to its assets and liabilities, including any unrecognized intangible assets, in a hypothetical analysis that calculates the implied fair value of goodwill as if the reporting unit was being acquired in a business combination. If the implied fair value of goodwill is less than the carrying value, the difference is recorded as an impairment loss. Based on the results of the step two analyses, we recorded a $56.6 million, or $48.1 million, net of tax, goodwill impairment charge in the third quarter of fiscal 2013 related to the TTC, GMP and AMT reporting units. The carrying amounts of these reporting units, including goodwill were as follows:

              As of June 30, 2013, the goodwill amounts after the impairment charges for the TTC, GMP and AMT reporting units were $111.1 million, $72.3 million and $32.6 million, respectively.

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6.           Goodwill and Intangible Assets (Continued)

              The gross amount and accumulated amortization of our acquired identifiable intangible assets with finite useful lives included in "Intangible assets – net" on the consolidated balance sheets, were as follows:

              In fiscal 2013, the increases in gross amounts were attributable to the fiscal 2013 acquisitions described in Note 5, "Mergers and Acquisitions" and, to a lesser extent, foreign currency translation adjustments. Amortization expense for these intangible assets for fiscal 2013, 2012 and 2011 was $32.4 million, $29.6 million and $28.0 million, respectively. Estimated amortization expense for the succeeding five years and beyond is as follows:

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7.           Property and Equipment

              The property and equipment consisted of the following:

              The depreciation expense related to property and equipment, including assets under capital leases, was $29.5 million, $26.7 million and $27.1 million for fiscal 2013, 2012 and 2011, respectively.

              In fiscal 2012, one of our properties met the held for sale classification criteria at fiscal 2012 year-end. This property consists of land and a building at a net book value of $5.8 million. We estimated the fair value of this property using market values for similar properties, and this is considered a Level 3 measurement as defined in FASB's guidance on "Fair Value Measurements and Disclosures." After adjustment to fair value, the $2.4 million carrying value of this property was reclassified to "Prepaid expenses and other current assets" in the consolidated balance sheet at September 30, 2012. Additionally, we recorded the related non-cash impairment charge of $3.4 million in our corporate "Selling, general and administrative expenses" in the consolidated statement of operations for fiscal 2012.

              In connection with exit activities related to vacating leased facilities, we recorded a loss of $7.2 million in the second half of fiscal 2013. The loss consisted of an accrued liability of $4.8 million for estimated contract termination costs associated with the long-term non-cancelable leases of those facilities, reduced by $0.3 million of write-offs of prorated portions of existing deferred items previously recognized in connection with the leases, and $2.7 million in net write-offs of fixed assets, primarily leasehold improvements, furniture and fixtures, that were no longer in use after vacating the facilities. The loss is recorded in other costs of revenue on the consolidated statements of operations (see Note 10, "Leases" for further information).

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8.           Income Taxes

              The income before income taxes, by geographic area, was as follows:

              Income tax expense consisted of the following:

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8.           Income Taxes (Continued)

              Total income tax expense was different from the amount computed by applying the U.S. federal statutory rate to pre-tax income as follows:

              Our fiscal year 2013 effective tax rate was 112.0% compared to 34.9% for fiscal 2012. The higher effective tax rate resulted primarily from impairment charges and valuation allowance. We are currently under examination by the Internal Revenue Service for the fiscal years 2005 through 2009, and by the California Franchise Tax Board for fiscal years 2004 through 2005, with respect to R&E credits. We are also subject to various other state audits. With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations for fiscal years before 2004.

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8.           Income Taxes (Continued)

              Temporary differences comprising the net deferred income tax liability shown on the accompanying consolidated balance sheets were as follows:

              We have performed an assessment of positive and negative evidence regarding the realization of the deferred tax assets at September 29, 2013. This assessment included the evaluation of scheduled reversals of deferred tax liabilities, availability of carry-backs, and estimates of projected future taxable income. Although realization is not assured, based on our assessment, we have concluded that it is more likely than not that the assets will be realized except for the assets related to loss carry-forwards in foreign jurisdictions for which a valuation allowance of $7.5 million has been provided.

              At September 29, 2013, undistributed earnings of our foreign subsidiaries, primarily in Canada, amounting to approximately $23.5 million are expected to be permanently reinvested. Accordingly, no provision for U.S. income taxes or foreign withholding taxes has been made. Upon distribution of those earnings, we would be subject to U.S. income taxes and foreign withholding taxes. Determination of the amount of unrecognized deferred U.S. income tax liability is not practicable; however, the potential foreign tax credit associated with the deferred income would be available to partially reduce the resulting U.S. tax liabilities.

              At September 29, 2013, we had $25.9 million of unrecognized tax benefits. Included in the balance of unrecognized tax benefits at the end of fiscal year 2013 were $24.1 million of tax benefits that, if recognized, would affect our effective tax rate. It is not expected that there will be a significant change in

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8.           Income Taxes (Continued)

the unrecognized tax benefits in the next 12 months. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

              We recognize potential interest and penalties related to unrecognized tax benefits in income tax expense. The amount of interest expense (net of interest income) accrued at September 29, 2013 and September 30, 2012, was $2.3 million and $3.1 million, respectively.

9.           Long-Term Debt

              Long-term debt consisted of the following:

              At September 30, 2012, we had a credit agreement that provided for a $460 million five-year revolving credit facility that matured in March 2016. On May 7, 2013, we entered into the Amended Credit Agreement and refinanced the indebtedness under the prior credit agreement. The Amended Credit Agreement is a $665 million senior secured, five-year facility that provides for a $205 million Term Loan Facility and a $460 million Revolving Credit Facility. The Amended Credit Agreement allows us to, among other things, finance certain permitted open market repurchases of our common stock, permitted acquisitions, and cash dividends and distributions. The Revolving Credit Facility includes a $200 million sublimit for the issuance of standby letters of credit, a $20 million sublimit for swingline loans, and a $150 million sublimit for multicurrency borrowings and letters of credit. Borrowings under the Amended Credit Agreement are collateralized by our accounts receivable, the stock of certain of our subsidiaries,

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9.           Long-Term Debt (Continued)

and intercompany loans. The Amended Credit Agreement expires on May 7, 2018, or earlier at our discretion upon payment in full of loans and other obligations. We had borrowings outstanding under the Amended Credit Agreement at September 29, 2013 of $205.0 million, entirely under the Term Loan Facility, at a weighted-average interest rate of 1.56% per annum. Borrowings during fiscal 2013 under our credit facilities were at a weighted-average interest rate of 1.84% per annum. At September 29, 2013, there was $12.4 million outstanding in standby letters of credit under the Amended Credit Agreement. At September 29, 2013, we had $447.6 million of available credit under the Revolving Credit Facility, of which $265.5 million could be borrowed without a violation of our debt covenants.

              The Term Loan Facility is subject to quarterly amortization of principal, with no principal payment due in year 1, $10.3 million payable in both years 2 and 3, and $15.4 million payable in both years 4 and 5, respectively, with any unpaid balance due at maturity. The Term Loan may be prepaid at any time without penalty. We may borrow on the Revolving Credit Facility, at our option, at either (a) a Eurocurrency rate plus a margin that ranges from 1.15% to 2.00% per annum, or (b) a base rate for loans in U.S. dollars (the highest of the U.S. federal funds rate plus 0.50% per annum, the bank's prime rate or the Eurocurrency rate plus 1.00%) plus a margin that ranges from 0.15% to 1.00% per annum. In each case, the applicable margin is based on our Consolidated Leverage Ratio, calculated quarterly. The Term Loan Facility is subject to the same interest rate provisions.

              The Amended Credit Agreement contains certain affirmative and restrictive covenants, and customary events of default. The financial covenants provide for a maximum Consolidated Leverage Ratio of 2.50 to 1.00 and a minimum Consolidated Fixed Charge Coverage Ratio of 1.25 to 1.00. Our obligations under the Amended Credit Agreement are guaranteed by certain of our subsidiaries and are secured by first priority liens on (i) the equity interests of certain of our subsidiaries, including those subsidiaries that are guarantors or borrowers under the Amended Credit Agreement, and (ii) our accounts receivable, general intangibles and intercompany loans, and those of our subsidiaries that are guarantors or borrowers. As of September 29, 2013, we met all compliance requirements of these covenants.

              On September 27, 2013, we entered into Amendment No. 1 to the Amended Credit Agreement to amend the definition of "Consolidated EBITDA" for purposes of the financial covenants contained in the Amended Credit Agreement to add back to Consolidated Net Income for the fiscal quarters ending September 29, 2013, December 29, 2013 and March 30, 2014 (i) up to $34 million in non-recurring charges incurred during the fiscal quarter ended June 30, 2013 in connection with corporate restructurings and (ii) up to $36 million in non-cash charges incurred during the fiscal quarter ended June 30, 2013 in connection with the Four Programs referenced in our Form 8-Ks, filed with the SEC on June 18, 2013 and August 7, 2013, and Form 10-Q for the fiscal quarter ended June 30, 2013. Amendment No. 1 also provides that Consolidated EBITDA will be calculated without giving effect to the add-backs referenced above for purposes of determining our applicable margin in effect at any time.

              In fiscal 2013, other debt includes capital leases of $1.8 million, property and equipment loans of $0.1 million, and a bank overdraft facility of $0.9 million at one of our foreign affiliates. In fiscal 2012, other debt includes capital leases of $2.8 million, property and equipment loans of $0.5 million, and a bank overdraft facility of $0.5 million at one of our foreign affiliates.

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9.           Long-Term Debt (Continued)

              We have three letter of credit agreements with three banks to issue up to $40 million in standby letters of credit. The amount of standby letters of credit outstanding under these facilities at September 29, 2013 was $6.5 million, of which $6.4 million was issued in currencies other than the U.S. dollar.

              The following table presents scheduled maturities of our long-term debt:

10.         Leases

              We lease office and field equipment, vehicles and buildings under various operating leases. In fiscal 2013, 2012 and 2011, we recognized $80.8 million, $76.6 million and $71.9 million of expense associated with operating leases, respectively. Amounts payable under non-cancelable operating and capital lease commitments are as follows during the following fiscal years:

              We vacated certain facilities under long-term non-cancelable leases and recorded contract termination costs of $4.5 million in fiscal 2013, $1.3 million in fiscal 2012 and $1.3 million in fiscal 2011. These amounts were initially measured at the fair value of the portion of the lease payments associated with the vacated facilities, reduced by estimated sublease rentals, less the write off of a prorated portion of existing deferred items previously recognized on these leases. We expect the remaining lease payments to be paid through the various lease expiration dates that continue until 2019.

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10.         Leases (Continued)

              We initially measured the lease contract termination liability at the fair value of the prorated portion of the lease payments associated with the vacated facilities, reduced by estimated sublease rentals and other costs. If the actual timing and potential termination costs or realization of sublease income differ from our estimates, the resulting liabilities could vary from recorded amounts. These liabilities are reviewed periodically and adjusted when necessary. We expect the remaining lease payments to be paid through the various lease expiration dates that continue until 2021. The following is a reconciliation of the beginning and ending balances of these liabilities related to lease contract termination costs:

11.         Stockholders' Equity and Stock Compensation Plans

              At September 29, 2013, we had the following stock-based compensation plans:

•

2003 Outside Director Stock Option Plan.  Non-employee directors may be granted options to purchase an aggregate of up to 400,000 shares of our common stock at prices not less than 100% of the market value on the date of grant. Exercise prices of all options granted were at the market value on the date of grant. These options vest and become exercisable on the first anniversary of the grant date if the director has not ceased to be a director prior to such date, and expire no later than ten years from the grant date.



•

2005 Equity Incentive Plan ("EIP").  Key employees and non-employee directors may be granted equity awards, including stock options, restricted stock and RSUs, with respect to an aggregate of 6,086,216 shares of our common stock. Options granted before March 6, 2006 vest at 25% on the first anniversary of the grant date, and the balance vests monthly thereafter, such that these options become fully vested no later than four years from the date of grant. These options expire no later than ten years from the date of grant. Options granted on and after March 6, 2006 vest at 25% on each anniversary of the grant date. These options expire no later than eight years from the grant date. RSUs granted to date vest at 25% on each anniversary of the grant date.


In accordance with our Executive Compensation Policy, our Compensation Committee has awarded restricted stock to executive officers and non-employee directors under the EIP. Restricted stock grants generally vest over a minimum three-year period, and may be performance-based, determined by EPS growth, or service-based.

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11.         Stockholders' Equity and Stock Compensation Plans (Continued)

•

Employee Stock Purchase Plan ("ESPP").  Purchase rights to purchase common stock are granted to our eligible full and part-time employees, and shares of common stock are issued upon exercise of the purchase rights. An aggregate of 2,373,290 shares may be issued pursuant to such exercise. The maximum amount that an employee can contribute during a purchase right period is $5,000. The exercise price of a purchase right is the lesser of 100% of the fair market value of a share of common stock on the first day of the purchase right period or 85% of the fair market value on the last day of the purchase right period (December 15, or the business day preceding December 15 if December 15 is not a business day).

              The stock-based compensation and related income tax benefits were as follows:

Stock Options

              Stock option activity for the fiscal year ended September 29, 2013 was as follows:

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11.         Stockholders' Equity and Stock Compensation Plans (Continued)

              The aggregate intrinsic value in the table above represents the total intrinsic value (the difference between our closing stock price on the last trading day of fiscal 2012 and the exercise price, times the number of shares) that would have been received by the in-the-money option holders if they had exercised their options on September 29, 2013. This amount will change based on the fair market value of our stock. At September 29, 2013, we expect to recognize $6.3 million of unrecognized compensation cost related to stock option grants over a weighted-average period of 1.7 years. At September 29, 2013, there were approximately 3.4 million options available for future awards.

              The weighted-average fair value of stock options granted during fiscal 2013, 2012 and 2011 was $8.74, $8.37 and $9.08, respectively. The aggregate intrinsic value of options exercised during fiscal 2013, 2012 and 2011 was $6.4 million, $6.1 million and $2.3 million, respectively.

              The fair value of our stock options was estimated on the date of grant using the Black-Scholes option pricing model. The following assumptions were used in the calculation:

              For purposes of the Black-Scholes model, forfeitures were estimated based on historical experience. For the fiscal 2013, 2012 and 2011 year-ends, we based our expected stock price volatility on historical volatility behavior and current implied volatility behavior. Our risk-free rate of return was based on constant maturity rates provided by the U.S. Treasury. The expected life was based on historical experience.

              Net cash proceeds from the exercise of stock options were $16.0 million, $18.2 million and $8.4 million for fiscal 2013, 2012 and 2011, respectively. Our policy is to issue shares from our authorized shares upon the exercise of stock options. The actual income tax benefit realized from exercises of nonqualified stock options and disqualifying dispositions of qualified options for fiscal 2013, 2012 and 2011 was $3.7 million, $3.2 million and $1.4 million, respectively.

Restricted Stock and RSUs

              In fiscal 2013, 2012 and 2011, we awarded 108,350 shares, 105,567 shares and 94,606 shares, respectively, of restricted stock to certain of our executive officers and non-employee directors. Of the aggregate total of 308,523 awards, vesting as to 10,000 shares is time-based, and is dependent on the officer's continued employment, or the non-employee director's continued service, with us, but otherwise vest over a three-year period. As to the remaining 298,523 shares, vesting is performance-based, such that the percentage of awarded shares that ultimately vests, from 0% to 140%, is dependent on fiscal year earnings per share growth rates for the three fiscal years that end after the award date. In fiscal 2013, 2012 and 2011, an additional 4,947 shares, 5,305 shares and 8,356 shares of restricted stock, respectively, were awarded for performance-based adjustments in excess of 100% vesting. Restricted stock forfeitures result from employment terminations prior to vesting, and from performance-based vesting of less than 100%.

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11.         Stockholders' Equity and Stock Compensation Plans (Continued)

Forfeited shares return to the pool of authorized shares available for award. As of September 29, 2013, there were 938,114 shares available for future awards of restricted stock.

              Restricted stock activity for the fiscal year ended September 29, 2013 was as follows:

              The fair value of the total compensation cost of each restricted stock award was determined at the date of grant using the market price of the underlying common stock as of the date of grant. For performance-based awards, our expected performance is reviewed to estimate the percentage of shares that will vest. The total compensation cost of the awards is then amortized over their applicable vesting period on a straight-line basis.

              In fiscal 2013, we also awarded 226,655 RSUs to our employees at the fair value of $24.32 per share on the award date. All of the RSUs have time-based vesting over a four-year period. At September 29, 2013, there were 333,140 RSUs outstanding. RSU forfeitures result from employment terminations prior to vesting. Forfeited shares return to the pool of authorized shares available for award.

              In the first quarter of fiscal 2012, we also awarded 181,348 RSUs to our employees at the fair value of $22.53 per share on the award date. All of the RSUs have time-based vesting over a four-year period.

              The stock-based compensation expense related to restricted stock and RSUs for fiscal years 2013, 2012 and 2011 was $2.2 million, $3.0 million and $1.7 million, respectively, and was included in the total stock-based compensation expense. At September 29, 2013, there was $7.1 million of unrecognized compensation costs related to restricted stock and RSUs that will be substantially recognized by the end of fiscal 2017.

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11.         Stockholders' Equity and Stock Compensation Plans (Continued)

              RSU activity for the fiscal year ended September 29, 2013 was as follows:

ESPP

              The following table summarizes shares purchased, weighted-average purchase price, cash received and the aggregate intrinsic value for shares purchased under the ESPP:

              The grant date fair value of each award granted under the ESPP was estimated using the Black-Scholes option pricing model with the following assumptions:

              For fiscal 2013, 2012 and 2011, we based our expected stock price volatility on historical volatility behavior and current implied volatility behavior. The risk-free rate of return was based on constant maturity rates provided by the U.S. Treasury. The expected life was based on the ESPP terms and conditions.

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11.         Stockholders' Equity and Stock Compensation Plans (Continued)

              Included in stock-based compensation expense for fiscal 2013, 2012 and 2011 was $0.8 million, $0.9 million and $1.0 million, respectively, related to the ESPP. The unrecognized stock-based compensation costs for awards granted under the ESPP at September 29, 2013 and September 30, 2012, were $0.2 million and $0.2 million, respectively. At September 29, 2013, ESPP participants had accumulated $3.1 million to purchase our common stock.

12.         Retirement Plans

              We have established defined contribution plans including 401(k) plans. Generally, employees are eligible to participate in the defined contribution plans upon completion of one year of service and in the 401(k) plans upon commencement of employment. For fiscal 2013, 2012 and 2011, employer contributions to the plans were $9.5 million, $14.7 million and $14.1 million, respectively.

              We have established a non-qualified deferred compensation plan for certain key employees and non-employee directors. Eligible employees and non-employee directors may elect to defer the receipt of salary, incentive payments, restricted stock and RSU awards, and non-employee director fees, which are generally invested by us in individual variable life insurance contracts we own that are designed to informally fund savings plans of this nature. At September 29, 2013 and September 30, 2012, the consolidated balance sheets reflect assets of $17.2 million and $13.4 million, respectively, related to the deferred compensation plan in "Other long-term assets," and liabilities of $16.1 million and $12.9 million, respectively, related to the deferred compensation plan in "Other long-term liabilities."

13.         Earnings Per Share

              The following table sets forth the number of weighted-average shares used to compute basic and diluted EPS:

              The computation of diluted loss per share for fiscal 2013 excludes 0.5 million of potential common shares due to their anti-dilutive effect. For fiscal 2012 and 2011, 1.9 million and 2.6 million options were excluded from the calculation of dilutive potential common shares, respectively. These options were not

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13.         Earnings Per Share (Continued)

included in the computation of dilutive potential common shares because the assumed proceeds per share exceeded the average market price per share for that period. Therefore, their inclusion would have been anti-dilutive.

14.         Derivative Financial Instruments

              We use certain interest rate derivative contracts to hedge interest rate exposures on our variable rate debt. We enter into foreign currency derivative contracts with financial institutions to reduce the risk that cash flows and earnings will be adversely affected by foreign currency exchange rate fluctuations. Our hedging program is not designated for trading or speculative purposes.

              We recognize derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. We record changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as accounting hedges in our consolidated balance sheets as accumulated other comprehensive income.

              In fiscal 2009, we entered into an intercompany promissory note with a wholly-owned Canadian subsidiary in connection with the acquisition of Wardrop Engineering, Inc. The intercompany note receivable is denominated in CAD and has a fixed rate of interest payable in CAD. In the second quarter of fiscal 2010, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $3.9 million at the date of inception) that matured on January 28, 2013. In the third quarter of fiscal 2011, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $4.2 million at the date of inception) with a maturity date of January 27, 2014. Our objective was to eliminate variability of our cash flows on the amount of interest income we receive on the promissory note from changes in foreign currency exchange rates. These contracts were designated as cash flow hedges. Accordingly, changes in the fair value of the contracts were recorded in "Other comprehensive income". In the second quarter of fiscal 2013, we settled one of the foreign currency forward contracts for U.S. $3.9 million and terminated the remaining forward contract. As a result, we recognized immaterial gains and losses in our consolidated statements of operations for fiscal 2013, 2012 and 2011.

              In fiscal 2013, we entered into three interest rate swap agreements that we have designated as cash flow hedges to fix the variable interest rates on a portion of borrowings under our Term Loan Facility. At September 29, 2013, the effective portion of our interest rate swap agreements designated as cash flow hedges before tax effect was $0.9 million, of which $0.9 million is expected to be reclassified from accumulated other comprehensive income to interest expense within the next 12 months.

              As of September 29, 2013, the notional principal, fixed rates and related expiration dates of our outstanding interest rate swap agreements are as follows:

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14.         Derivative Financial Instruments (Continued)

              The fair values of our outstanding derivative instruments were as follows (in thousands):

              The impact of the effective portions of derivative instruments in cash flow hedging relationships on income and other comprehensive income from our foreign currency forward contracts and interest rate swap agreements was immaterial for the fiscal years ended September 30, 2012 and September 29, 2013. Additionally, there were no ineffective portions of derivative instruments. Accordingly, no amounts were excluded from effectiveness testing for our foreign currency forward contracts and interest rate swap agreements. We had no derivative instruments that were not designated as hedging instruments for fiscal 2013, 2012 and 2011.

15.         Fair Value Measurements

              Derivative Instruments.    For additional information about our derivative financial instruments (see Note 2, "Basis of Presentation and Preparation" and Note 14 "Derivative Financial Instruments" for more information).

              Contingent Consideration.    We measure our contingent earn-out liabilities at fair value on a recurring basis (see Note 2, "Basis of Presentation and Preparation" and Note 5, "Mergers and Acquisitions" for further information).

              Debt.    The fair value of long-term debt was determined using the present value of future cash flows based on the borrowing rates currently available for debt with similar terms and maturities (Level 2 measurement, as described in "Critical Accounting Policies and Estimates"). The carrying value of our long-term debt approximated fair value at September 29, 2013 and September 30, 2012. For fiscal 2013, we had a net borrowing of $205.0 million under our amended credit agreement to fund our business acquisitions, working capital needs and contingent earn-outs (see Note 9, "Long-Term Debt" for more information).

16.         Joint Ventures

Consolidated Joint Ventures

              The aggregate revenue of the consolidated joint ventures was $15.6 million, $19.3 million and $74.3 million for fiscal 2013, 2012 and 2011, respectively. The assets and liabilities of these consolidated joint ventures were immaterial at fiscal 2013, 2012 and 2011 year-ends. These assets are restricted for use

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16.         Joint Ventures (Continued)

only by those joint ventures and are not available for our general operations. Restricted cash and cash equivalents at September 29, 2013 and September 30, 2012 were $1.2 million and $1.6 million, respectively.

Unconsolidated Joint Ventures

              We account for our unconsolidated joint ventures using the equity method of accounting. Under this method, we recognize our proportionate share of the net earnings of these joint ventures within "Other costs of revenue" in our consolidated statements of operations. For fiscal 2013, 2012 and 2011, we reported $3.5 million, $2.9 million and $4.9 million of equity in earnings of unconsolidated joint ventures, respectively. Our maximum exposure to loss as a result of our investments in unconsolidated variable interest entities is typically limited to the aggregate of the carrying value of the investment. Future funding commitments for the unconsolidated joint ventures are immaterial. The unconsolidated joint ventures are, individually and in aggregate, immaterial to our consolidated financial statements.

              The aggregate carrying values of the assets and liabilities of the unconsolidated joint ventures were $24.0 million and $21.8 million, respectively, at September 29, 2013, and $19.0 million and $15.7 million, respectively, at September 30, 2012.

17.         Commitments and Contingencies

              We are subject to certain claims and lawsuits typically filed against the engineering, consulting and construction profession, alleging primarily professional errors or omissions. We carry professional liability insurance, subject to certain deductibles and policy limits, against such claims. However, in some actions, parties are seeking damages that exceed our insurance coverage or for which we are not insured. While management does not believe that the resolution of these claims will have a material adverse effect, individually or in aggregate, on our financial position, results of operations or cash flows, management acknowledges the uncertainty surrounding the ultimate resolution of these matters.

              We acquired BPR, a Quebec-based engineering firm on October 4, 2010. Subsequently, we have been informed of the following with respect to pre-acquisition activities at BPR:

              On April 17, 2012, authorities in the province of Quebec, Canada charged two employees of BPR Triax, a subsidiary of BPR, and BPR Triax, under the Canadian Criminal Code with allegations of corruption. Discovery procedures associated with the charges are currently ongoing, and the legal process is expected to continue into fiscal 2014. We have conducted an internal investigation concerning this matter and, based on the results of our investigation, we believe these allegations are limited to activities at BPR Triax prior to our acquisition of BPR.

              During late March 2013, the then-president of BPR gave testimony to the Charbonneau Commission, which is investigating possible corruption in the engineering industry in Quebec. He stated that during 2007 and 2008, he and other former BPR shareholders paid personal funds to a political party official in exchange for the award of five government contracts. Further, prior to the testimony, we were not aware of the misconduct. We have accepted the resignation of BPR's former president, and are evaluating the impact of these pre-acquisition actions on our business and results of operations.

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17.         Commitments and Contingencies (Continued)

              During March 2013, following the resignation of BPR's former president, we learned that criminal charges had been filed against BPR and its former president in France. The charges relate to allegations that, in 2009, a BPR subsidiary had hired an employee of another firm to be CEO of that BPR subsidiary as a part of a corrupt scheme that allegedly damaged, among others, the employee's former employer. A trial in this matter is scheduled for May 2014.

              On April 19, 2013, a class action proceeding was filed in Montreal in which BPR, BPR's former president, and other Quebec-based engineering firms and individuals are named as defendants. The plaintiff class includes all individuals and entities that have paid real estate or municipal taxes to the city of Montreal. The allegations include participation in collusion to share contracts awarded by the City of Montreal, conspiracy to reduce competition and fix prices, payment of bribes to officials, making illegal political contributions, and bid rigging.

              On June 28, 2013, a purported class action lawsuit was filed against Tetra Tech and two of our officers in United States District Court for the Central District of California. The action was purportedly brought on behalf of purchasers of our publicly traded securities between May 3, 2012 and June 18, 2013. The complaint alleges generally that we and those officers violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and related rules because we allegedly failed to take unspecified, "necessary" charges to our accounts receivables and earnings during the class period. In addition, the complaint alleges that the financial guidance we offered during the class period was intentionally or recklessly false and misleading. The complaint alleges unspecified damages based on the decline in the market price of our shares following the issuance of revised guidance on June 18, 2013. On October 30, 2013, plaintiff filed an amended complaint for the same purported class period making essentially the same allegations. We believe the case is without merit and intend to defend it vigorously.

              The financial impact to us of the matters discussed above is unknown at this time.

18.         Reportable Segments

              In the first quarter of fiscal 2013, we implemented a reorganization of our operations to improve future growth and profitability. These activities included the consolidation and realignment of certain operating activities to improve organizational effectiveness and achieve efficiencies in our segment management. This reorganization included the elimination of the EAS segment. Operating activities previously reported in this segment were realigned to operations with similar client types, project types and financial metrics in the ECS and TSS segments. Segment results for the prior year have been revised to conform to the current-year presentation.

              Our reportable segments for fiscal 2013 were as follows:

              Engineering and Consulting Services.    ECS provides front-end science, consulting engineering and project management services in the areas of surface water management, water infrastructure, solid waste management, mining, geotechnical sciences, arctic engineering, industrial processes and oil sands, transportation and information technology.

              Technical Support Services.    TSS provides management consulting and engineering services and strategic direction in the areas of environmental assessments/hazardous waste management, climate

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18.         Reportable Segments (Continued)

change, international development, international reconstruction and stabilization, energy, oil and gas, technical government consulting, and building and facilities.

              Remediation and Construction Management.    RCM provides full-service support, including construction and construction management, to all of our client sectors, including the U.S. federal government in the United States and internationally, and commercial clients worldwide, in the areas of environmental remediation, infrastructure development, solid waste management, energy, and oil and gas.

              Management evaluates the performance of these reportable segments based upon their respective segment operating income before the effect of amortization expense related to acquisitions and other unallocated corporate expenses. We account for inter-segment sales and transfers as if the sales and transfers were to third parties; that is, by applying a negotiated fee onto the costs of the services performed. All significant intercompany balances and transactions are eliminated in consolidation.

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

18.         Reportable Segments (Continued)

              The following tables set forth summarized financial information concerning our reportable segments:

Reportable Segments

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

18.         Reportable Segments (Continued)

Geographic Information

Major Clients

              Other than the U.S. federal government, we had no single client that accounted for more than 10% of our revenue. All of our segments generated revenue from all client sectors.

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

18.         Reportable Segments (Continued)

              The following table presents our revenue by client sector:

19.         Quarterly Financial Information – Unaudited

              In the opinion of management, the following unaudited quarterly data for fiscal years ended September 29, 2013 and September 30, 2012 reflect all adjustments necessary for a fair statement of the results of operations.

              In the third quarter of fiscal 2013, we reported operating losses of $99.9 million, which included a non-cash goodwill impairment charge of $56.6 million. Additionally, we incurred project charges, including claims related to adverse developments on three programs in the RCM segment with U.S. federal and state and local government clients. We also recorded a project-related charge on a commercial development project in the TSS segment due to a change in client ownership and the related modification of plans for completion of the project. Collectively, project charges on these four programs reduced operating income

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TETRA TECH, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

19.         Quarterly Financial Information – Unaudited (Continued)

by $35.5 million. Further, the weaker results in our Eastern Canada and global mining operations and the resulting charges to right-size these businesses caused a reduction of $28.2 million in operating income.

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Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

              None.

Item 9A.    Controls and Procedures

              Evaluation of disclosure controls and procedures and changes in internal control over financial reporting

              At September 29, 2013, we carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures. Based on our management's evaluation (with the participation of our principal executive officer and principal financial officer), our principal executive officer and principal financial officer have concluded that, as of the end of the period covered by this report, our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act), were effective.

Management's Report on Internal Control over Financial Reporting

              Our management is responsible for establishing and maintaining adequate internal control over financial reporting. As defined in Exchange Act Rule 13a-15(f), internal control over financial reporting is a process designed by, or under the supervision of, our principal executive and principal financial officer and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with U.S. GAAP. Internal controls include those policies and procedures that (i) pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of our assets; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. GAAP and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on our consolidated financial statements.

              Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Accordingly, even effective internal control over financial reporting can only provide reasonable assurance of achieving their control objectives.

              Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we assessed the effectiveness of our internal control over financial reporting at September 29, 2013, based on the criteria in Internal Control – Integrated Framework (1992) issued by the COSO. Based upon this assessment, management has concluded that our internal control over financial reporting was effective at September 29, 2013, at a reasonable assurance level.

              PricewaterhouseCoopers LLP, the independent registered public accounting firm that audited the consolidated financial statements included in this Form 10-K, has issued a report on our internal control over financial reporting. This report, dated November 20, 2013, appears on page 79 of this Form 10-K.

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Changes in Internal Control over Financial Reporting

              There were no changes in our internal control over financial reporting during the three months ended September 29, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B.    Other Information

              None.

PART III

Item 10.    Directors, Executive Officers and Corporate Governance

              The information required by this item relating to our directors and nominees, regarding compliance with Section 16(a) of the Exchange Act, and regarding our Audit Committee is included under the captions "Proposal No. 1 – Election of Directors – General" and "Business Experience of Nominees," "Ownership of Securities – Section 16(a) Beneficial Ownership Reporting Compliance," and "Proposal No. 1 – Election of Directors – Board Committees and Meetings" in our Proxy Statement related to the 2014 Annual Meeting of Stockholders and is incorporated by reference.

              Pursuant to General Instruction G(3) of Form 10-K, the information required by this item relating to our executive officers is included under the caption "Executive Officers of the Registrant" in Part I of this Report.

              We have adopted a code of ethics that applies to our principal executive officer and all members of our finance department, including our principal financial officer and principal accounting officer. This code of ethics, entitled "Finance Code of Professional Conduct," is posted on our website. The Internet address for our website is www.tetratech.com, and the code of ethics may be found through a link to the Investor Relations section of our website.

              We intend to satisfy the disclosure requirement under Item 5.05 of Form 8-K for any amendment to, or waiver from, a provision of this code of ethics by posting any such information on our website, at the address and location specified above.

Item 11.    Executive Compensation

              The information required by this item is included under the captions "Proposal No. 1 – Election of Directors – Director Compensation" and "Executive Compensation and Related Information" in our Proxy Statement related to the 2014 Annual Meeting of Stockholders and is incorporated by reference.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

              The information required by this item relating to security ownership of certain beneficial owners and management, and securities authorized for issuance under equity compensation plans, is included under the caption "Ownership of Securities" in our Proxy Statement related to the 2014 Annual Meeting of Stockholders and is incorporated by reference.

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Item 13.    Certain Relationships and Related Transactions, and Director Independence

              The information required by this item relating to review, approval or ratification of transactions with related persons is included under the captions "Review, Approval or Ratification of Transactions with Related Persons" and "Certain Transactions with Related Persons," and the information required by this item relating to director independence is included under the caption "Proposal No. 1 – Election of Directors – Independent Directors," in each case in our Proxy Statement related to the 2014 Annual Meeting of Stockholders and is incorporated by reference.

Item 14.    Principal Accounting Fees and Services

              The information required by this item is included under the captions "Proposal No. 4 – Ratification of Independent Registered Public Accounting Firm – Principal Accountant Fees and Services" and "Policy on Audit Committee Pre-Approval of Audit and Permissible Non-Audit Services of Independent Registered Public Accounting Firm" in our Proxy Statement related to the 2014 Annual Meeting of Stockholders and is incorporated by reference.

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PART IV

Item 15.    Exhibits, Financial Statement Schedules

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TETRA TECH, INC.
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

For the Fiscal Years Ended
October 2, 2011, September 30, 2012 and September 29, 2013
(in thousands)

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SIGNATURES

              Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

POWER OF ATTORNEY

              KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Dan L. Batrack and Steven M. Burdick, jointly and severally, his attorney-in-fact, each with the full power of substitution, for such person, in any and all capacities, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he might do or could do in person, hereby ratifying and confirming all that each of said attorneys-in-fact and agents, or his substitute, may do or cause to be done by virtue hereof.

              Pursuant to the requirements of the Securities Exchange Act of 1934, this Report on Form 10-K has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

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INDEX TO EXHIBITS

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