TETRA TECH INC - Annual Report: 2013 (Form 10-K)

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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

FORM 10-K

Commission File Number 0-19655

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

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

None

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:

•

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



•

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



•

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;



•

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:

•

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;



•

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;



•

use a substantial portion of our cash resources;



•

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;



•

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:

•

incur additional indebtedness;



•

create liens securing debt or other encumbrances on our assets;



•

make loans or advances;



•

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:

⁽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