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                          SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549
                                     FORM 10-K

(MARK ONE)
     
     /X/  Annual report pursuant to section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the fiscal year ended September 28, 1997.October 4, 1998.
     / /  Transition report pursuant to section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the transition period from _______ to_________________
          to__________.

     Commission file number 0-19655

                                   TETRA TECH, INC.
                (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

     
             Delaware                                95-4148514
  (State or other jurisdiction of         (I.R.S. Employer Identification No.)
   incorporation or organization)


            670 N. Rosemead Blvd.
             Pasadena, California                                  91107
(Address of registrant's principal executive offices)            (Zip Code)
       executive offices)


(Registrant's telephone number, including area code:)           (626) 351-4664


Securities registered pursuant to Section 12(b) of the Act:      
     
(Title of each class)              (Name of each exchange on which registered)

     None                                                   None


Securities registered pursuant to Section 12(g) of the Act: 
          
                                   (Title of Class)
                             Common Stock, $.01 par value


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 /X/   No / / 

The aggregate market value of the voting stock held by non-affiliates of the
registrant on December 9, 199718, 1998 was $366,641,534.$577,495,874.

The number of shares of Common Stock, $.01 par value, outstanding (the only
class of common stock of the registrant outstanding) was 22,268,95828,666,131 on December
9, 1997.18, 1998.

Portions of registrant's Annual Report to Stockholders for the fiscal year ended
September 28, 1997October 4, 1998 are incorporated by reference in Part II of this report. 
Portions of registrant's Proxy Statement for its 1998our 1999 Annual Meeting of
Stockholders are incorporated by reference in Part III of this report.

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K 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. / /


                                       PART I

ITEM 1.         BUSINESS.
 
       THIS ANNUAL REPORT ON FORM 10-K CONTAINS FORWARD-LOOKING STATEMENTS 
WITHIN THE MEANING OF SECTION 27A OF THE SECURITIES ACT OF 1933 AND SECTION 
21E OF THE SECURITIES EXCHANGE ACT OF 1934.  THESE STATEMENTS ARE IN THE 
SECOND PARAGRAPH UNDER "OVERVIEW," IN THE FIRST AND SECOND PARAGRAPHS UNDER 
"RESOURCE MANAGEMENT BUSINESS AREA," AND IN THE FIRST, FIFTH AND FOURTEENTH 
PARAGRAPHS UNDER "ENVIRONMENTAL LEGISLATION." ACTUAL RESULTS COULD DIFFER 
MATERIALLY FROM THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS AS A RESULT 
OF THE RISK FACTORS SET FORTH BELOW UNDER "RISK FACTORS." 

INTRODUCTION

     Tetra Tech, Inc. ("Tetra Tech" or the "Company") provides nationally
recognized engineering andis a leading provider of specialized management
consulting services focusing on
cost-effective solutions to engineering, environmental and natural resource
management problems.  These services are directed to a broad base of public and
private sector clients and include substantially all types of engineering and
consultingtechnical services in the environmental area, such as water chemistry,
geohydrology, soil science, water and wastewater treatment, hydrodynamics,
geology, air quality and civil engineering.  Engineering services also include
mechanical, electrical, chemical and structural engineering, as well as
architecture and design, and are applied to infrastructure projects including
wastewater treatment plants, roads, schools and telecommunications projects 
including structures and construction management.

     The Company was incorporated in Delaware in February 1988 to acquire the 
assets of the Water Management Group of Tetra Tech, Inc. (the "Predecessor"), 
a subsidiary of Honeywell Inc. ("Honeywell"), in a management buy-out in 
March 1988.  The Predecessor was founded in 1966 as a coastal and marine 
engineering business.  Honeywell acquired the Predecessor in 1982, by which 
time the Predecessor had developed an integrated water and environmental 
science and engineering business.  In November 1988, the Company acquired 
GeoTrans, Inc., a groundwater service firm.  In March 1990, the Company 
acquired M.H. Loe Company ("Loe"), an underground storage tank removal and 
remediation company.  In October 1991, Loe was merged into the Company. In 
October 1993, the Company acquired Simons, Li & Associates, Inc., a firm 
engaged primarily in advanced water resources and environmental engineering.  
In June 1994, the Company acquired Hydro-Search, Inc., a groundwater 
hydrology and remediation firm.  In September 1995, the Company acquired 
Tetra Tech EM Inc. (formerly known as PRC Environmental Management, Inc.), an 
environmental engineering and consulting firm which provides services ranging 
from policy analysis to innovative remedial technology evaluation.  In 
November 1995, the Company acquired KCM, Inc., an engineering firm 
specializing in the areas of water quality, water and wastewater systems, 
surface water management, fisheries and facilities.  In December 1996, the 
Company acquired IWA Engineers, an architecture and engineering ("A/E") firm 
providing a wide range of planning, engineering and design capabilities in 
water, wastewater and facility design.  In December 1996, the Company also 
acquired FLO Engineering, Inc., a consulting and engineering firm 
specializing in water resource engineering involving hydraulic engineering 
and hydrographic data collection.  In January 1997, the Company merged 
Hydro-Search, Inc. into GeoTrans, Inc. and changed the name of the combined 
entity to HSI GeoTrans, Inc.  In March 1997, the Company acquired SCM 
Consultants, Inc., a consulting and engineering firm, providing design of 
irrigation, water and wastewater systems, as well as facility and 
infrastructure engineering services.  In June 1997, the Company acquired 
Whalen & Company, Inc. and Whalen Service Corps Inc. (collectively, "WAC"), a 
wireless telecommunication services firm providing site development services 
for PCS, cellular, ESMR, air-to-ground, microwave, paging, fiber optic and 
switching centers technology.  In July 1997, the Company acquired CommSite 
Development Corporation, a wireless telecommunication site development 
service firm.  Since 1966, the Company's business has expanded through the 
establishment of an international network of over 90 offices, allowing the 
development of technical and marketing expertise in a variety of geographic 
areas.

OVERVIEW

     Tetra Tech works in partnership with government and industry to balance the
need for economic growth with sustainable development of natural resources and
adequate infrastructure to sustain economic activity.  The Company responds to
its partnerships by recognizing the uniqueness of each client; by recognizing
the requirements and needs of the client; setting priorities and ensuring proper
allocation and control of resources applied to a problem; as well


                                          1


as monitoring results.  The Company's goal is to help the client build
environmental performance into each aspect of their organizational activities to
enhance both environmental and fiscal performance.  Tetra Tech achieves this
goal by assisting clients to be more effective in pollution prevention, better
manage the spectrum of environmental compliance, and apply innovative and
cost-effective solutions to remediation or corrective action to problems
impacting our environment.  

     Tetra Tech has a commitment to people and results, technical excellence and
teamwork and cost-effective solutions for its clients' technical problems.  The
challenges of today's resource management and infrastructure issues requires an
integrated multi-disciplinary approach to assist clients in making informed
decisions and to implement them in the most cost-effective way.  These
challenges are driven by:

     -   Complex and continuously evolving environmental regulations and the 
         need for a more strategic approach to meet national and 
         international environmental challenges in a way that allows the 
         government and industry to be cost-effective and competitive in the 
         markets they serve.  
     
     -   Increased emphasis on pollution prevention and waste minimization as 
         a necessary part of a long-term solution to sound natural resource 
         management.  
     
     -   Competition for limited resources and the need for new and more 
         effective technology to achieve pollution prevention, resource 
         management and remediation goals more cost-effectively.
           
     -   Population growth requiring new municipal infrastructure including 
         water and wastewater treatment plants, roads, and pipelines, as well 
         as schools, office buildings and criminal justice facilities.

COMPANY SERVICES

     The Company's services generally fall within three principal business areas: resource
management, infrastructure and telecommunicationscommunications. As a specialized management
consultant, we assist our clients in defining problems and developing innovative
and cost-effective solutions. Our management consulting services are
complemented by our technical services. The
Company provides its clients with five lines of service includingThese technical services, which
implement solutions, include research and development, applied science, and management consulting,
engineering and architectural design, construction management, and facility operationoperations
and maintenance. Our clients include a diverse base of public and private
organizations located in the United States and internationally.
 
       Since our initial public offering in December 1991, we have increased the
size and scope of our business and have expanded our service offerings through a
series of strategic acquisitions and internal growth. We have more than 3,600
employees worldwide, 3,500 of whom are located in North America in more than 100
locations. In addition, we have established a presence in Asia, South America
and Europe. From fiscal 1991 through fiscal 1998, we generated a net revenue
compounded annual growth rate of approximately 34.2%, and achieved a net income
compounded annual growth rate of approximately 36.4%.
 
INDUSTRY OVERVIEW
 
       Due to increased competition, changing regulatory environments and rapid
technological advancement, many organizations face new and complex challenges.
Increasingly, these organizations are turning to professional services firms to
assist them with addressing these challenges. Since each industry presents its
own unique set of challenges, organizations often seek professional service
firms with industry-specific expertise to analyze their problems and develop
appropriate solutions. These servicessolutions are offered individually or together as partthen implemented by firms possessing
the required engineering and technical service capabilities. Each of the
Company's full service approach to problems.following three business areas faces its own unique set of problems:
 
       RESOURCE MANAGEMENT.  The Company is currently
performing services under more than 800 active contracts, which range from small
site investigations to large, complex infrastructure projects.
     
     RESOURCE MANAGEMENT BUSINESS AREAworld's natural resources, including water, air
and soil, are interdependent, creating a delicate balance. Factors such as
agricultural and residential development, commercial construction and
industrialization often upset this balance. Public concern withover environmental
issues, especially water resourcesquality and other environmental issuesavailability, has been a driving force
behind the promulgation of numerous laws and regulations which
seekthat are designed to control or prevent environmental
degradation and mandate restorative measures. To comply with environmental laws
and regulations, respond to public pressure and attain operating efficiencies,
public and private organizations are increasing their focus on resource
management. Two areas particularly affected by these trends are water management
and waste management.
 
             -  Water Management. Insufficient water supplies, concern over the
      cost, quality and availability of water and the need in many parts of the
      world to replace aging infrastructure used to capture, safeguard and
      distribute water are critical social and economic concerns. According to
      the United StatesU.S. Environmental Protection Agency ("EPA")(EPA), contamination of
      groundwater and surface water resulting from industrial, agricultural, residential,
      commercial and residentialindustrial development is one of the most serious
      environmental problems facing the United States. To alleviate these social
      and economic concerns, public and private organizations seek water
      management advice. According to the ENVIRONMENTAL BUSINESS JOURNAL, the
      size of the consulting, engineering services and wastewater treatment
      segments of the water management industry totaled more than $30 billion in
      1997.
 
             -  Waste Management. In the past, many waste disposal practices
      caused significant environmental damage. Since the 1970s, more stringent
      controls on municipal and industrial waste have been established by
      governments around the world to protect the environment. Recently, the
      Federal government has committed approximately $15 billion to various
      environmental initiatives in an attempt to curb pollution, accelerate
      toxic waste cleanups and
 
                                       2

      combat other forms of pollution. Organizations seek waste management
      advice to comply with complex and evolving environmental regulations, to
      minimize the economic impact of waste generation and disposal, and to
      realize significant costs savings through increased operating
      efficiencies.
 
       INFRASTRUCTURE.  Continued population and economic growth places
significant strain on an overburdened infrastructure, thereby requiring
additional development. This development includes water and wastewater treatment
plants, roads, pipelines, communication and power networks, and educational,
recreational and correctional facilities. Additionally, as existing facilities
age, they require upgrading or replacement. Further, the trend toward
privatization of infrastructure is causing public and private organizations that
develop and maintain these facilities to evaluate their cost structures and
establish more efficient systems. These factors drive the need for development
and planning services that are often provided by consulting firms. According to
the ENGINEERING NEWS-RECORD, the market opportunity in the United States for
technical services in infrastructure development including water and wastewater,
transportation, hazardous waste, and educational, recreational and correctional
facilities, ranges from $15 to $20 billion.
 
       COMMUNICATIONS.  Technological change and government deregulation have
spurred sweeping changes in the communications industry. Local and long-distance
telephone companies, cable operators and wireless service providers are
penetrating each other's markets and trying to establish a foothold in new
markets created by new technologies. For example, traditional cable operators
are installing advanced capabilities such as digital cable, cable modem, cable
telephony and other high-speed data transmission services. At the same time,
various service providers are consolidating in order to offer their subscribers
a comprehensive set of services and to maintain dominance in their markets. As
these trends continue, network service providers will increasingly turn to
professional service firms for advice and assistance in planning, deploying and
maintaining their communications networks.
 
       Organizations within each of the above business areas face unique
problems but often lack the internal resources and experience necessary to
identify issues and evaluate possible solutions. As a result, many of these
organizations rely on advice from outside management consultants. Most
consulting companies provide limited front-end problem assessment and solution
design and require clients to engage other engineering and technical services
companies to implement recommended solutions. A significant opportunity exists
for consulting companies that not only develop, but also implement, solutions.
These professional service firms are often in the best position to help clients
respond to the challenges they face.
 
THE TETRA TECH SOLUTION
 
       Tetra Tech provides the specialized management consulting services that
assist clients in identifying industry-specific problems and defining
appropriate solutions. We also provide the technical services required to
implement these solutions. We believe that we are a leader in this market and
that the following factors distinguish us from our competitors:
 
       UNDERSTANDING CLIENT NEEDS.  The ability to identify client needs is
essential to strategic planning and execution. Even before the proposal process
begins, we assist our clients by helping them define their business objectives
and strategies and identify issues that are critical to their success. We strive
to develop numerous contacts at various levels within our clients' organizations
to help us identify the key issues from a variety of perspectives. We believe
that our long history and exposure to a broad client base increase our awareness
of the issues being confronted by organizations and thereby help us identify and
solve our clients' problems.
 
       CAPITALIZING ON OUR EXTENSIVE TECHNICAL EXPERIENCE.  Since our inception
in 1966, we have provided innovative consulting and engineering services,
historically focusing on cost-effective solutions to water resource management
and environmental problems. We have been successful in leveraging this
 
                                       3

foundation of scientific and engineering capabilities into other areas,
including infrastructure and communications. Our services are provided by a wide
range of professionals including: archaeologists, biologists, chemical
engineers, chemists, civil engineers, computer scientists, economists,
electrical engineers, environmental engineers, environmental scientists,
geologists, hydrogeologists, mechanical engineers, oceanographers and
toxicologists. Because of the interrelated
natureexperience that we have gained from thousands of
groundwater, surface water and rainwater in the water cycle,
contamination of one source of water affects the quality of other sources. 
Surface water can be affected by direct contamination or runoff from cities or
agricultural areas. In addition, soil contamination from hazardous materialscompleted projects, we often leads to water contamination through surface runoff and infiltration. 
Similarly, air pollution and the resulting acid rain and other forms of
deposition can contribute to the contamination of water resources over a wide
geographic area.  This contamination can threaten the quality of the water
supplies that serve as drinking water sources and detrimentally affect aquatic
life and the quality of lakes, rivers, estuaries, harbors and oceans.

     The economic and environmental consequences from continuously evolving
regulations present new opportunities for the Company to assist public and
private sector clients in achieving compliance.  Past enforcement efforts under
the Clean Water Act ("CWA") have focused on regulating sources of pollution
which originate from a discrete point, such as industrial facilities and
municipal treatment plants.  Much of the Company's water-related environmental
business has been derived from this market.  However, the EPA estimates that
nonpoint sources, such as stormwater runoff from urban streets, runoff from
farmland and construction sites, atmospheric deposition, drainage and combined
sewer overflow, currently account for more than 50% of the pollution entering
the nation's waters.  As a result, the EPA is currently developing programs and
allocating funding to address the complex problem


                                          2


of nonpoint source pollution within the context of holistic watershed
management.  Under National Pollutant Discharge Elimination System ("NPDES")
regulations promulgated in November 1990, for example, the EPA will require
municipalities and industriesare able to apply for nonpoint discharge permits.  The
Company's ongoingproven solutions to client
problems without the time-consuming process of developing new approaches.
 
       OFFERING A FULL RANGE OF SERVICES.  Our depth of consulting and technical
supportskills allows us to respond to client needs at every phase of the EPA's water programs has led to early
involvement in the development and implementation of this emerging nonpoint
source program.  However, no assurance can be given that the Company will
continue to participate in this program.

     In addition to the CWA, other laws, such as the Resource Conservation and
Recovery Act of 1976 ("RCRA"), the Comprehensive Environmental Response,
Compensation and Liability Act ("Superfund") and the Safe Drinking Water Act
("SDWA"), require companies and government agencies to make considerable
environmental expenditures.  Major environmental expenditures are also planned
by the United States government,a project,
including expenditures by the United States
Department of Defense ("DOD") and the United States Department of Energy ("DOE")
to clean up defense and nuclear weapons production and test facilities that have
become contaminated over the past four decades.
     
     In the Resource Management Business Area, the Company's services extend
frominitial planning, research and development, through applied science, and management consulting;
to
engineering and architectural design, and construction management. Once a
particular project is completed, we are able to offer our clients additional
value-added services such as operations and maintenance. Our expertise across
industries and our broad service offerings enable us to be a single source
provider to our clients.
 
       PROVIDING BROAD GEOGRAPHIC COVERAGE AND LOCAL EXPERTISE.  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. Our historical geographic base was primarily in the western portion of
the United States. However, we currently have operations in more than 40 states.
We have also increased our international presence, and we now have operations in
Canada, Taiwan, the Philippines, Argentina, Chile, Brazil and the Czech
Republic.
 
COMPANY STRATEGY
 
       Our objective is to become the leading provider of specialized management
consulting and technical services in our chosen business areas. To achieve this
objective, we plan to continue the following primary strategies that we believe
have been integral to our success:
 
       IDENTIFY AND EXPAND INTO NEW BUSINESS AREAS.  We use our management
consulting services and certain of our technical services as an entry point to
evaluate and to enter new 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 provision of site
acquisition services to communications industry participants, we identified
infrastructure services within the communications industry as an appropriate
area into which we could expand our operations.
 
       EXPAND SERVICE OFFERINGS AND GEOGRAPHIC PRESENCE THROUGH
ACQUISITIONS.  We believe that acquisition opportunities exist that will allow
us to continue our growth in selected business areas, broaden our service
offerings and extend our geographic presence. We intend to make acquisitions
that will enable us to consolidate our position in certain key business areas,
such as communications, or further strengthen our position in our more
established service offerings. We believe that our reputation and public company
status make us an attractive partner and provide us with an advantage in
pursuing acquisitions.
 
       FOCUS ON GOVERNMENT PROJECTS.  We intend to continue marketing to
government organizations and bidding for government projects to stay on the
leading edge of policy development. This experience helps us identify market
opportunities and enhances our ability to serve other public and private
clients. Additionally, government contracts provide more predictable revenues
than private sector contracts.
 
       MANAGE INTERNAL FINANCIAL CONTROLS.  We take a disciplined approach to
monitoring, managing and improving our return on investment in each of our
business areas through the prompt billing and collection of accounts
receivables, the negotiation of favorable contract terms and the management of
our contract performance to prevent cost overruns. We believe that this approach
to managing our
 
                                       4

financial affairs enables us to improve our cash position and thereby fund
acquisitions and internal growth.
 
       LEVERAGE EXISTING CLIENT BASE.  Some of our clients engage us to provide
limited services. We believe that we can increase our revenue by selling
additional services to our existing client base. For example, we may be able to
secure an operations and maintenance contract after working with a client on the
design and construction phases of a facility. In addition, we believe that our
ability to offer a full spectrum of services will allow us to grow our business
and compete more effectively for larger projects.
 
SERVICES
 
       We provide our clients with comprehensive management consulting and
technical services that focus on our clients' industry-specific needs. We offer
these services individually or as part of our full service approach to problem
solving. We are currently performing services under 1,000 active contracts,
ranging from small site investigations to large, complex infrastructure
projects. Our service offerings include:
 
      - MANAGEMENT CONSULTING to assist clients in identifying and addressing
        operational and competitive problems they face within their industries;
 
      - RESEARCH AND DEVELOPMENT to formulate solutions to complex problems and
        develop advanced computer simulation techniques for modeling problems,
        ranging from microscopic to global;
 
      - APPLIED SCIENCE to assess all aspects of problems and develop practical
        and cost-effective solutions through the application of new technology
        and data interpretation;
 
      - ENGINEERING AND ARCHITECTURAL DESIGN to provide services from concept
        development and initial planning and design through project completion;
 
      - CONSTRUCTION MANAGEMENT to provide experienced and specialized
        construction managers to assist clients in minimizing the risk of cost
        overruns, delays and contractual conflicts; and
 
      - OPERATIONS AND MAINTENANCE to allow clients to outsource routine
        functions, permitting them to streamline contractor relationships and
        reduce operating costs.
 
BUSINESS AREAS
 
       We provide our services in the following three principal business areas:
resource management, infrastructure and communications.
 
RESOURCE MANAGEMENT
 
       One of our major concentrations is water resource management, where we
have a leadership position in understanding the interrelationships of water
quality and human activities. We support high priority government programs for
water quality improvement, environmental restoration, productive reuse of
defense facilities and strategic environmental resource planning. We provide
comprehensive services, including management consulting, research and
development, applied science, engineering and architectural design, construction
management, and operationoperations and maintenance. Our service offerings in the
resource management business area are focused on the following project areas:
 
      SURFACE WATER PROJECTSPROJECTS: Public concern with the quality of surface water resources, defined as rivers, lakes
      and streams as well as coastal and marine waters and the ensuing
      legislative and regulatory response have led to ais driving demand for the Company'sour services.
      Over the past 3132 years, the Company and the Predecessorwe have developed a specialized set of technical
      skills which position the Companythat positions us to compete effectively for surface water and
      watershed management projects. The
Company providesWe provide water resource services to
      publicgovernment clients such as the
 
                                       5
EPA, DODthe Department of Defense (DOD) and DOEthe Department of Energy (DOE),
      and to a broad base of private sector clients including those in the
      chemical, pharmaceutical, utility, aerospace and petroleum industries. The CompanyWe
      also providesprovide surface water services to state and local agencies,
      particularly in the areasarea of watershed management, flood control and drainage designs.  The
Company's services in the management of surface water quantity and quality
include research and development for new generations of computer models that can
predict and compare the response of water quality parameters under various
watershed management practices; design of monitoring programs; consulting
services, particularly in regulatory compliance, permitting and nonpoint source
management; and engineering design of integrated best management practices
(e.g., stormwater detention ponds and artificial wetlands), stream, lake and
wetland restoration and enhancement measures, and flood conveyance and control
structures.

     Traditional "command and control" solutions used since the 1970s by the
federal government to bring industrial and municipal wastewater treatment plant
discharges into compliance have been successful in reducing impacts to U.S.
surface waters.  However, a significant percentage of waters remain polluted due
primarily to diffuse "nonpoint source" pollution generated by man's activities
on the rural and urban landscape.  Under a reauthorized CWA expected within the
next one to two years, the EPA has set as a high priority working with state 
and local governments to implement more effective nonpoint source and watershed
management programs to address this problem.

     The Company has also worked closely with the U.S. Army Corps of Engineers
("ACE") to develop and implement nationwide non-traditional approaches to flood
control policy, planning, and design.  As a consultant to ACE, the Company has
implemented flood control practices using natural, non-structural features.  In
addition to ensuring human health, safety, and welfare protection, this new
approach results in a decreased federal investment, higher benefit-to-cost
ratios, the creation of recreational opportunities, and the enhancement and
effective long-term management of endangered urban watersheds.

     The Company has worked closely with the EPA since the passage of the CWA in
1977 in researching and evaluating surface water environmental systems.  Under
contracts with the EPA, the Company has assisted in the development of national
guidelines on surface water monitoring strategies, nonpoint source pollution
control practices, pollution trading and other economic incentive-based control
strategies, and public education methods for use by states and local agencies in
their ongoing surface water and watershed management programs.  Through its work
for the


                                          3


EPA, the Company has developed expertise in complex modeling, Geographic
Information Systems ("GIS"), remote sensing, surface water monitoring, data
analyses, publication of national guidance documents and environmental impact
assessments for surface water projects.  The development of this knowledge base
has strategically positioned Tetra Tech as an authority on regulations affecting
discharges to surface water and best management practices.

     Examples of past and current projects in the surface water field include
the following: 

     -   STORMWATER RUNOFF.  The Company recommended methods to manage 
         stormwater runoff and other point and nonpoint sources of pollution 
         for a variety of clients including Clermont County, Ohio; Baltimore 
         and Prince Georges Counties, Maryland; Suffolk County, New York; 
         Prince William County, Virginia; and the City of Tucson, Arizona.  
         For Prince Georges County, Tetra Tech developed several new 
         investigative technologies to assess and manage stormwater pollution 
         under the NPDES program.  Predictive models and statistical 
         algorithms integrated with GIS help prioritize water quality 
         efforts.  Models are also being developed to assess water quality 
         benefits derived from wetland systems and other best management 
         practices.  The Company assisted the California Department of 
         Transportation to establish a statewide stormwater quality 
         monitoring program to meet state and federal regulations. 
      
     -   WATER SUPPLY PROTECTION.  Tetra Tech is assisting several local 
         agencies in watershed restoration and pollution source assessments 
         in areas where surface water supplies are susceptible to land 
         activities (e.g., urbanization, agriculture).  These include, for 
         example, facilitating and refining management objectives for the 
         Orange Water and Sewer Authority, North Carolina; development of a 
         watershed plan for the Loch Raven Reservoir, Baltimore, Maryland; 
         and nitrogen loading impacts of domestic septic systems within the 
         Patuxent River Watershed, Maryland. 
          
     -   WATERSHED ASSESSMENT TOOL DEVELOPMENT.  Under contracts with the EPA 
         and Prince Georges County, Maryland, Tetra Tech has developed a 
         number of watershed assessment tools that provide integration of 
         watershed and receiving water models, databases, monitoring and 
         design data, and watershed attribute information within a GIS 
         platform (PC-Windows and UNIX workstations). These tools range from 
         "BASINS," which was developed for the EPA to be used by states to 
         perform local and regional scale watershed assessments, to "SAM," 
         which was developed for Prince Georges County for detailed 
         assessment and optimization of best management practices.

     -   COASTAL NONPOINT POLLUTION.  As the prime contractor to the EPA's 
         Assessment and Watershed Protection Division, Tetra Tech is 
         assisting in the development of implementation strategies and 
         technical guidance for nonpoint source pollution control within the 
         coastal zone under the Coastal Nonpoint Pollution Control Program.  
         The Company is also assisting the EPA in developing guidance for the 
         assessment of stormwater discharges and combined sewer overflows as 
         required under NPDES regulations.  The Company is also assisting the 
         government of the Philippines in addressing problems related to the 
         management of the country's vital coastal resources.  Under this 
         contract, the Company provides scientific and engineering services 
         and policy support for the development and implementation of 
         effective community-based coastal resources and watershed management.
 
      -   FLOOD CONTROL PLANNING.  The Company is currently providing flood 
         control related planning services to the U.S. Army Corps of 
         Engineers' Los Angeles District.  Individual projects include flood 
         investigations of 72 sites in Arizona; an analysis of flooding 
         effects to 300 in-stream structures in California, Arizona, Nevada, 
         and Utah; a reconnaissance study for habitat restoration along the 
         Gila River in Arizona; and development of multiple-use flood 
         mitigation alternatives for 35 miles of the Salt River through the 
         metropolitan Phoenix area. The Company recently completed 
         development and analysis of alternative flood control measures for 
         the Los Angeles River, one of the most important urban flood control 
         projects in the country.  The Company considered numerous advanced 
         flood protection measures, including stormwater detention using 
         gravel pits, development of large greenbelts and flood walls.  
         Although this was one of the most contentious projects of its kind, 
         Tetra Tech successfully balanced habitat needs with structural flood 
         control solutions to develop a widely accepted plan. 

                                          4


     -   POWER PLANT DISCHARGES.  Under a contract with the Electric Power 
         Research Institute, the Company developed "RIVRISK," a multi-purpose 
         mathematical model used to assess potential human health risks from 
         power plant discharges into rivers.  The model is designed to help 
         utilities evaluate options, design new or restored wetlands, and 
         obtain permits for activities involving existing and constructed 
         wetlands such as power corridors, road construction and habitat 
         improvement.

     -   BLUE RIVER WETLANDS RESTORATION, BRECKENRIDGE, COLORADO.  The 
         Company completed the design of wetland creation and channel 
         restoration of the Blue River for the Town of Breckenridge.  The 
         project restored a one-mile reach of the Blue River which had been 
         disturbed by dredge boat mining from 1890 to 1940.  Project features 
         included the removal of 500,000 cu. yd. of dredge rock, 
         reconstruction of a stream channel including 22 drop structures to 
         enhance channel stability and overbank grading to create wetlands.  
         Approximately ten acres of riparian wetlands were developed.

     -   RIO GRANDE HYDROGRAPHIC DATA COLLECTION PROGRAM, NEW MEXICO.  The 
         Company is conducting a five-year hydrographic data collection 
         project on the Rio Grande in New Mexico for the Bureau of 
         Reclamation, Albuquerque Project Office.  Data collection includes 
         geomorphic observations, cross-sectional survey, flow measurement, 
         sediment transport and bed material samples.

GROUNDWATER PROJECTS

     According to the EPA, groundwater contamination is one of the most severe
environmental problems currently confronting the United States.PROJECTS: Groundwater is
located in the saturated zone beneath the land surface, is the source of drinking water for
      approximately 50% of the U.S. population and accounts for approximately
      25% of all water consumed for residential, industrial and agricultural
      purposes. Tetra Tech'sOur activities in the groundwater field are diverse and
      typically include projects such projects as the investigationinvestigating and identification ofidentifying sources
      of chemical contamination, in groundwater; the
examination ofexamining the extent of contamination; the analysis ofcontamination,
      analyzing the speed and direction of contamination migration;migration, and
      the designdesigning and evaluation ofevaluating remedial alternatives. In addition, the Company conductswe conduct
      monitoring studies to assess the effectiveness of groundwater treatment
      and extraction wells.
 
      Tetra Tech's
professionals have the ability to analyze complex groundwater data using
sophisticated computer models.

     Examples of past and current projects in the groundwater field include the
following: 

     -   INVESTIGATION, CHARACTERIZATION, AND REMEDIATION AT A FORTUNE 500 
         MANUFACTURING FACILITY IN WESTERN NEW YORK.  At a former 
         manufacturing facility with metals and volatile organic 
         compound impacted soil, the Company is implementing an innovative 
         combination of excavation, stabilization, and phytoremediation.  The 
         Company is currently coordinating the testing of the 
         phytoremediation component of the remedy, which uses vegetation for 
         the in-situ treatment of impacted soil.  The New York State 
         Department of Environmental Conservation is allowing the site to be 
         used to test a passive phytoremediation strategy.
     
     -   HYDROGEOLOGIC SUPPORT FOR GUANACO MINE IN ANTOFAGASTA, CHILE.  The 
         Company provided hydrogeologic services to substantially increase 
         the mine's current water supply.  At a site located in one of the 
         driest deserts in the world, the Company performed design and 
         supervision of the water-well and water exploration drilling 
         programs; well design and construction; review of hydrogeologic data 
         collected to date; new target area identification for groundwater 
         exploration; review of the hydrogeologic database currently used at 
         the mine; design of bid documents and screening of final bids for 
         securing new drillers; aquifer testing to evaluate adequacy of water 
         supply for life of mine; and general advice to the customer 
         pertaining to strategy for water supply development.  Tetra Tech's 
         efforts were successful after earlier efforts failed to produce 
         adequate water after drilling more than 100 boreholes. 

     -   UTILITIES CLEANUP.  The Company is supporting activities ranging 
         from initial site investigations through cleanup and demolition at 
         approximately 50 former manufactured gas plant sites across the 
         United States, including work in Oregon, Washington, California, 
         Iowa, Wisconsin, New York, New Jersey, West Virginia, and 
         Washington, DC. Of primary concern at most of these sites are dense 
         non-aqueous phase liquids ("DNAPL").  The Company is the author of 
         the standard reference

                                          5


         text, DNAPL SITE CHARACTERIZATION, and has taught seminars for the 
         EPA in all ten regions focusing on DNAPL investigation, cleanup and 
         control strategies.

     WASTE MANAGEMENT PROJECTS

     Tetra TechPROJECTS: We currently providesprovide a wide range of
      engineering and consulting services for hazardous waste contamination and
      remediation projects, from initial site assessment through design and
      implementation phases of remedial solutions. In addition, the Company
performswe perform risk
      assessments to determine the probability of adverse health effects that
      may result from exposure to toxic substances in environmental media.  The
Companysubstances. We also providesprovide waste
      minimization and pollution prevention services, and evaluatesevaluate the
      effectiveness of innovative technologies.

     Examples of past and current projects in hazardous waste management
include:

     -   RCRA FACILITY INVESTIGATION, INTERIM MEASURES, AND VERIFICATION 
         INVESTIGATIONS, WEST VIRGINIA FACILITY.  For a Fortune 500 client, 
         the Company is providing RCRA services at a facility with over 30 
         solid waste management units and areas of concern.  One task 
         involved the investigation of a landfill onsite where several cells 
         of buried drums and impacted soils were discovered.  The Company 
         successfully excavated, characterized, and disposed of the drums in 
         less than three months. At another landfill onsite, the Company 
         provided construction management services for stabilization of a 
         20,000-foot area along a stream bank. 
     
     -   NAVY INSTALLATION RESTORATION PROGRAM.  The Company is providing 
         program management and technical support for the Navy CLEAN program 
         under a ten-year contract.  Activities include installation 
         restoration, base realignment and closure, and underground storage 
         tank programs.  The Company has conducted numerous treatability 
         studies of both conventional and innovative treatment technologies 
         to assist in selecting cleanup strategies for naval installations.  
         The Company supports the Navy Environmental Leadership Program by 
         identifying and demonstrating innovative methods for the Navy to 
         achieve compliance with applicable laws and regulations, accelerate 
         cleanup, implement pollution prevention techniques, and conserve 
         natural resources.
     
     -   INNOVATIVE TECHNOLOGY EVALUATION.  The Company is the prime 
         contractor for the nationwide Superfund Innovative Technology 
         Evaluation ("SITE") program, to demonstrate and evaluate the 
         performance and cost of various processes for treating contaminated 
         soil and groundwater. Under SITE and similar federal government 
         efforts for the DOD and DOE, as well as state and private industry 
         partners, Tetra Tech has tested, evaluated, and disseminated 
         information on hundreds of new and emerging treatment technologies and has supported government and industry effortsnovel solutions to
      foster the 
         continued development of these and other new technologies.
     
     -   RCRA SUPPORT AT INDUSTRIAL PLANT.  The Company is performing a RCRA 
         Facility Investigation and streamlined Corrective Measures Study in 
         a fractured aquifer in Stonewall, Virginia.  A phased and risk-based 
         screening approach was used at the site to delineate 22 source 
         areas, resulting in the consolidation of 22 areas into five areas of 
         concern. The Company negotiated a streamlined approach that focuses 
         on passive remediation and limited source reduction, thus limiting 
         costs at the site.
     
     -   MUNICIPAL SOLID WASTE LANDFILLS.  The Company is participating in 
         remedial action at a landfill in Howard County, Maryland, including 
         contractor oversight, waste characterization, air monitoring, and 
         reporting functions at a hazardous waste removal action for more 
         than 500 buried drums.  Work included setting up site zones, health 
         and safety procedures, and standard procedures for drum removal, as 
         well as comprehensive community relations activities.  As part of 
         the same contract, the Company performed remedial 
         investigation/feasibility studies ("RI/FS") activities at three 
         municipal solid waste landfills.
     
     -   SUPPORT FOR ORDNANCE REMEDIATION.  The Company supported a 
         first-of-its-kind, large-scale demonstration of over 50 
         state-of-the-art technologies that detect, identify, and remediate 
         buried

                                          6


         unexploded ordnance (UXO) for the U.S. Army Environmental Center's 
         UXO Advanced Technology Demonstration Program.
     
     -   PORT OF LONG BEACH.  Tetra Tech is conducting site investigation and 
         remediation of petroleum-contaminated soils for the Port of Long 
         Beach, California.environmental problems.
 
      NUCLEAR ENVIRONMENTAL PROJECTSPROJECTS: The DOE's nuclear weapons plants and
      research laboratories haveface a wide variety of environmental needs,challenges
      including groundwater and surface water contamination, as well as hazardous waste
      management and environmental compliance. Tetra Tech'sOur services to the DOE are focused in areas compatible
with the Company's core businesses and include
      the National Environmental Policy
Act ("NEPA") analysisenvironmental impact analyses and documentation, environmental audits and
      risk assessments, regulatory compliance support, groundwater
      characterization, RI/FSremedial investigation/feasibility studies, and project
      management and oversight. The end of the Cold War and subsequent
arms reduction agreements have reduced the nation's requirements for nuclear
weapons.  These changes have resulted in increased opportunities for Tetra
Tech's nuclear environmental capabilities.  The Company'sOur environmental analyses will assistprovide the DOE with
      information it requires in order to make decisions regarding the storage
      or disposition of surplus materials from dismantled nuclear components from weapons no longer required for the U.S.
weapons stockpile.  

     Examples of DOE projects performed by the Company include the following:

     -   NUCLEAR TEST SITE.  The Company is a subcontractor under a 
         multi-year DOE contract for an RI/FS of radioactive contamination 
         resulting from activities, including nuclear test explosions, at the 
         DOE's Nevada Test Site.  This contract includes investigation of the 
         magnitude and extent of groundwater contamination, preparation of 
         environmental impact statements and corrective action under RCRA.
     
     -   SAVANNAH RIVER SITE.  The Company is a prime contractor to the DOE 
         Savannah River Site operator in South Carolina.  Ongoing programs 
         are being conducted by Tetra Tech to aid in the assessment of 
         closure and remedial action options for various waste units at this 
         site.  The Company is also providing multi-disciplinary support for 
         low-level radioactive and mixed waste management activities 
         including the assessment of waste characterization, sampling and 
         analysis, treatment, and disposal alternatives.
     
     -   SUPPORT TO ENVIRONMENTAL MANAGEMENT OFFICE.  The Company is 
         providing technical support to the Office of Environmental 
         Management at DOE Headquarters on a wide range of issues.  The focus 
         of this program is on applying successful environmental practices to 
         improve the efficiency and cost-effectiveness of environmental 
         restoration and waste management activities throughout the DOE 
         complex.weapon
      components.
 
      REGULATORY COMPLIANCE PROJECTS

     The Company'sPROJECTS: Our regulatory compliance services include
      advising our clients on the full spectrum of regulatory requirements under
      RCRA, the CWA,Resource Conservation and Recovery Act, the Clean Water Act, the Clean
      Air Act, the NEPANational Environmental Policy Act and other environmental
      laws. Although we provide services are provided to both public and private sector clients, the Company'sour
      current emphasis is on providing regulatory compliance services to the
      Army, Navy and Air Force installations. 
Activities have been conducted at bases which are closing as well as those which
are remaining open.  

     Examples of Tetra Tech's regulatory compliance projects includeForce.
 
INFRASTRUCTURE
 
       In the following:

     -   PHILIPPINES RESOURCE MANAGEMENT.  Assisting the 
         government of the Philippines, through the U.S. Agency for 
         International Development, with managing the country's natural 
         resources, including the nation's coastal environments. Supporting 
         Philippine environmental and resource management policies whichinfrastructure area, we focus on market-driven incentives that encourage industry to comply with 
         standards.

                                          7


     -   U.S. AIR FORCE.  A nationwide contract with the Air Mobility Command 
         to perform environmental compliance activities at Air Force bases.
     
     -   U.S. NAVY.  Environmental documentation for base realignment and 
         closure activities at U.S. Naval bases in the San Francisco Bay area.
     
     -   U.S. ARMY.  A nationwide contract with Army Material Command ("AMC") 
         to support compliance requirementsdevelopment of AMC installations and facility 
         tenants.

     INFRASTRUCTURE BUSINESS AREA
     
     Tetra Tech's focus is on engineeringwater resource
projects, such as water and wastewater
treatment plants, institutional facilities, commercial, recreational and leisure
facilities.facilities and transportation projects. These facilities are an essential part
of everyday life as well as being critical to
sustainingand also sustain economic activity.  Muchactivity and the quality of the U.S. infrastructure needs repair,
renovation or replacement, whereas developing countries need new infrastructure.
Tetra Tech'slife. Our
engineers, architects and planners are workingwork in partnership with public and private sector customersour clients to
ensureprovide adequate infrastructure development within fiscal objectives.
     
     In this business area, the Company's services includetheir financial constraints.
We assist clients with infrastructure projects by providing management
consulting, engineering and architectural design, construction management, and
operationoperations and maintenance. Examples of the Company's projectsOur service offerings in the Infrastructure Business Area
include:

     -   SEWAGE PUMP STATION AND FORCEMAIN.  The Company designed Portland, 
         Oregon's Fanno Pump Stationinfrastructure business
area are focused on the following project areas:
 
      WATER RESOURCE PROJECTS: Our technical services are applied to all aspects
      of water quantity and Forcemain Project to replace five 
         existing pump stations located in the uplands of the Fanno Creek 
         watershed.  The project includes construction of a gravity bypass 
         sewer to connect the existing gravity sewer to the pump station.  
         The project also includes construction of a forcemain approximately 
         16,200 feet in length.  The pump station is designed for flows in 
         the range of 4.2 to 13.5 million gallons per day ("MGD").  The 
         pumping station encloses a full carbon odor scrubber system, 
         stand-by power, chemical injection for downstream corrosion control, 
         automated controlsquality management ranging from stormwater
      management through drainage and connection to the City of Portland's 
         monitoring system.  Due to the nature of the site and surrounding 
         development, significant measures were taken to maintain the 
         integrity of wildlife habitat.  This was accomplished by careful 
         selection of plantings and landscaping materials to screen the 
         structure from surrounding homes and produce a habitat that 
         optimizes the site's wildlife carrying capacity. 

     -   FISH HATCHERY AND VISITOR CENTER.  The Texas Parks and Wildlife 
         Department selected the Company as prime consultant to plan and 
         develop a new, state-of-the-art, marine fish hatchery and visitor 
         center at Lake Jackson, Texas.  Sea Center Texas is located on a 
         60-acre parcel donated by the Dow Chemical Company.  Major project 
         components include a 30,000 sq. ft. hatchery building, a visitor 
         center, 40 one-acre lined ponds, a seawater pump station with five 
         miles of transmission piping, and a fresh water pump station with 
         2,000 feet of transmission piping.  A sophisticated ozone 
         disinfection/biofiltration system for seawater reuse is also in use. 
         The project involved the development of a master plan, preliminary 
         design, final design and construction administration.  In addition, 
         the Company provided engineering and bioengineering for all life 
         support systems.  
     
     -   DESIGN-BUILD RESIDENTIAL PROJECT.  The Company is currently 
         designing a 74 unit, four-story, residence hall for the Naval 
         Homeport in Everett, Washington.  This design-build project was 
         successfully awarded based upon the Company's design team's technical
         and price proposals. The Company is developing the final design for 
         this concrete, steel, and masonry structure.  Site improvements 
         include formal entries, basketball court and recreational field.  The 
         Company's responsibilities include design management, architectural, 
         civil, structural, site planning & construction services.  

     -   WASTEWATER LARGE-DIAMETER PIPELINE ADDITION.  The Company is 
         currently designing the Wilburton Siphon, a critical element of the 
         160 MGD Eastside Interceptor in King County, Washington, conveying 
         flows from Woodinville to Renton.  The project evaluates the existing 
         siphon in terms of flow capacity, condition, and odor control.  In 
         order to meet the future

                                          8


         capacity of 160 MGD through the siphon, a new parallel 48-inch 
         siphon barrel is to be added to the existing 16-, 30-, and 48-inch 
         barrels. Additionally, new structures upstream and downstream of the 
         existing siphon will be constructed to allow the flow to be bypassed 
         around the siphon control structure to allow for new lining of the 
         structures and future inspection and maintenance.  A new odor 
         control and chemical dosing facility is also being constructed at 
         the upstream end of the siphon to control odors at the siphon and 
         corrosion in the siphon and downstream tunnel.
     
     -   ROADWAY WIDENING.  The Company is currently completing plans, 
         specifications, and estimates ("PS&E") for the City of Bellingham, 
         Washington, for design of a two-mile section of Bakerview Road. The 
         project calls for widening the 35-mph, two-lane paved road with 
         5-foot shoulders to a roadway with two travel lanes in each 
         direction, a continuous left-turn lane, 5-foot bike paths, curbs, 
         gutters, and 7-to 9.5-foot sidewalks on both sides. New traffic 
         channelization and signalization at four intersections are included 
         in the design requirements.  The Company prepared alternative 
         analyses, a design report, PS&E and right-of-way plans.  Improvements
         include filling existing ditches, removing vegetation, and providing 
         wetland mitigation.  

     -   LAKE AND WATERSHED RESTORATION AND CREATION.  Tetra Tech is one of 
         the Southwest's leaders in developing lakes and watersheds within 
         coastal, arid and semi-arid regions.  These projects offer multiple 
         benefits, including habitat enhancement, recreation, flood control projects to major water quality protection, beach sand replenishment, and
      species 
         re-introduction.  The Company is providing lake design services, 
         including grant application preparation,wastewater treatment plants. Our experience includes planning, permitting, 
         engineering and design and
      construction services for a new 
         recreation lake in Picacho, Arizona.  The Company is workingdrinking water projects, the design of water
      treatment facilities and reservoirs, and the design of distribution
      systems including pipelines and pump
 
                                       6

      stations. Our capabilities are also applied to specialized technical
      challenges associated with the ACE on watershed management and enhancement 
         plans in the Aliso Creek and San Juan Creek systems in coastal 
         southern California as well as the Gila River near Tucson, Arizona.

     -   MUNICIPAL FLOOD CONTROL DESIGN.  The Company has provided design 
         services for numerous  flood control projects in western states.  
         The Company provided design and construction of fisheries and
      hatcheries worldwide.
 
      INSTITUTIONAL FACILITIES PROJECTS: We provide architectural engineering
      and construction services for the Talbert Channel ocean outlet, a major componentprojects including site planning for land
      development, complete architectural design, interior design,
      civil/structural engineering and mechanical/electrical engineering of
      the ACE's 
         Santa Ana River flood control project.  This project is the largest
         of its kind west of the Mississippi River.  For the city of Federal 
         Way, Washington, the Company performed the feasibility assessment, 
         predesignmulti-story facilities. We have completed engineering and final designconstruction
      projects for a regional stormwater detention basin
         to address existingwide range of clients with specialized needs such as
      security systems, clean rooms, laboratories and predicted future flooding on a rapidly 
         urbanizing portion of Hylebos Creek. The results ofemergency preparedness
      facilities.
 
      COMMERCIAL, RECREATIONAL AND LEISURE FACILITIES PROJECTS: We specialize in
      the analysis 
         identified flood frequency levels, identified unstable downstream 
         channel reaches,planning and predicted typical water quality expected for the 
         site.  The subsequent design required balancing various environmental 
         (wetlands, fisheries, water quality) and physical (property 
         availability, geologic) constraints.  The Company is currently 
         charged with developing design for the City of Scottsdale's Desert 
         Greenbelt multi-million dollar flood control project.  The project 
         will protect homeowners from flash flooding within alluvial fans, 
         one of the most challenging environments for effective flood 
         control.  In addition to design of channelswater-related entertainment and sediment basins, the 
         team willleisure
      facilities from theme park attractions to large marine aquariums. Our
      projects also include hotels, parks, visitor centers and marinas. We have
      designed complex aquatic life support systems and provided structural,
      civil and mechanical engineering and design roadway, bridges,of interpretive exhibits for a
      series of large aquarium projects worldwide.
 
      TRANSPORTATION PROJECTS: We provide architectural, engineering and
      park features, and is 
         responsible for landscape architecture to create not just a simple 
         flood control project but also a community amenity.  
          
     -   REGIONAL STORMWATER DETENTION AND WATER QUALITY FACILITY.  The 
         Company designed a 21-acre regional detention and water quality 
         treatment facility for the City of Federal Way, Washington, to serve 
         a largely commercial and industrial tributary watershed.  Runoff 
         from the tributary area was being directed to an undersized 
         detention pond and discharged into Tributary 0013 of West Hylebos 
         Creek, an important anadromous fish bearing creek.  Following a 
         feasibility assessment, the Company used the "HSPF" model to 
         evaluate conditions for land use as they existed in 1975, a time of 
         much lighter development, prior to significant water quality and 
         flooding problems.  Using the "HSPF" base case model, a facility was 
         sized to achieve the target goals. Features to enhance water quality 
         included a sedimentation forebay, meandering low flow channels to 
         maximize contact with stormwater, and an outlet micropool for 
         trapping organics that may transfer through the facility. 
         Landscaping visually screens the facility.  All plantings emphasize 
         the use of native, drought-tolerant vegetation to promote survival 
         and minimize maintenance.  The Company developed a plan

                                          9


         for planting vegetation that would tolerate the fluctuations and 
         duration of stormwater and also benefit the biological and 
         biochemical treatment of the stormwater runoff quality.
     
     -   INDUSTRIAL OIL-WATER SEPARATION.  The Company provided complete 
         engineeringconstruction services for design of two coalescing plate oil-water 
         separators at the North Boeing Field facility in Seattle, 
         Washington. The new separators will treat stormwater runofftransportation projects to improve public safety
      and provide spill protection in fueling areas.  The larger of the 
         separators was 50' x 20'mobility. Our projects include roadway improvements, commuter railway
      stations and designed to support the full 
         operational load of a Boeing 757 jet liner.  Associated taxiway 
         paving comprised approximately 10,000 square feet of area.
     
     -   WASTEWATER TREATMENT PLANT DESIGN.  The City of Snoqualmie, 
         Washington, is projected to increase from 1,200 to over 18,000 
         people in the next 20 years, necessitating a major upgrade to the 
         existing aerated lagoon treatment plant and river bank outfall.  The 
         Company prepared an engineering report and design documents for 
         these improvements on a fast track time schedule.  The facilities 
         include a 2 MGD oxidation ditch plant with ultra violet 
         disinfection, coagulation and filtration to meet Class A reclaimed 
         water standards and provisions for future biological nutrient 
         removal.  The existing lagoon will be used for sludge treatment and 
         storage, with future sludge disposal by dredging and land 
         application.  Effluent disposal is based on discharging secondary 
         effluent to a new Snoqualmie River outfall in the winter, and Class 
         A reclaimed water to the outfall and golf course irrigation in the 
         summer.  Provisions are included for pilot testing rapid 
         infiltration disposal of Class A reclaimed water, because future 
         total maximum daily load ("TMDL") limits for biochemical oxygen 
         demand, toxic metals and nutrients may effectively prohibit summer 
         discharge to the river.  Intensive pretreatment and water supply 
         corrosion control efforts are planned to minimize toxic heavy metals 
         concentrations (copper, cadmium, zinc, etc.) in the sewage.  River 
         water quality will be monitored for heavy metals using the EPA's "clean
         techniques."
     
     -   NEW MAIN OFFICE BUILDING.  The Company provided complete design and 
         construction administration services for this 33,500 sq. ft., $3.3 
         million building, including drive-through bill paying, 
         accounting/data processing, personnel, purchasing, engineering, 
         Board Meeting room and community auditorium, all served by a 
         fully-integrated computer network, energy-efficient heat pump 
         system, and low-maintenance building systems. 
     
     -   WASHINGTON STATE PENITENTIARY TELECOMMUNICATIONS PROJECT.  This $3 
         million project included construction of a new 4,500 sq. ft., 
         one-story building with offices, work rooms, and telecommunications 
         equipment room.  Telecommunications work included design, 
         construction, and installation of a new high-bandwidth, digital 
         telecommunications infrastructure for voice and data services.  The 
         Company provided development of drawings and specifications, and 
         construction administration services. 
     
     -   SCHOOL OVERPRESSURIZATION PROJECT.  This $4.3 million project 
         created pressurized, protected areas of refuge for the students and 
         staff at eleven schools in the communities of Hermiston, Umatilla, 
         and Irrigon, Oregon.  The project began with defining protective 
         zones within each of the facilities. This involved facility surveys 
         and interviews with users of each facility.  Protective designs were 
         developed and construction documents were prepared for bid.  This 
         design features include high efficiency particulate and gas 
         absorption filters, air handling units with high-pressure fans and 
         heating and cooling systems, diesel generator systems for emergency 
         electrical power, and a pressure sensing and control system.  
     
     -   PASCO HIGH SCHOOL RENOVATION AND EXPANSION.  The Company provided 
         full A/E services for the 106,000 sq. ft. remodel and 20,000 sq. ft. expansion of this mid-1950's high school facility  Construction cost 
         was $13.5 million forairports. We have also completed numerous
      transportation projects including bridges, major highways, and repair,
      replacement and upgrading of older transportation facilities.
 
COMMUNICATIONS
 
       In the project, which was completed in 1995. 
         Completely redesigned auditorium, administration, gymnasium and 
         laboratory spaces are featured incommunications area, we focus on the highly functional new layout. 
         Audio, video and data networks have been provided throughout the 
         building. 

                                          10


     OPERATION AND MAINTENANCE PROJECTS

     The Company also works in partnership with government and somedelivery of the
world's leading corporations to develop long-termtechnical
solutions to their total
facility management and operation needs.  Tetra Tech's approach to Operation &
Maintenance ("O&M") services is to provide a fully integrated capability that
targets improving technical effectiveness at the operating unit and process
levels.

     The Company's O&M services include the operation and maintenance of
facilities as well as oversight and support for day-to-day compliance
activities.  Tetra Tech has operated treatment plants, soil and groundwater
remediation systems, air monitoring stations, hazardous waste
transfer/collection stations, landfills, and industrial systems.  The Company's
approach to O&M services focuses on improving operating efficiencies and
maintaining continued effectiveness of operating units.  O&M services offered by
the Company range from overall facility operating management to obtaining a
facility's operating permits and licenses and providing the necessary
documentation through automated data management systems.  In addition, Tetra
Tech has the capability to manage its clients' complete waste management
requirements; to mitigate environmental impact from past management practices;
and also to ensure that operations meet the stringent operating, reporting and
administrative demands placed on today's facility managers.
     
     -   LARGE AIR FORCE BASE FACILITIES.  The Company is prime contractor 
         for O&M services at a large Air Force Base in California.  The 
         Company provides O&M services for a wastewater treatment plant and a 
         hazardous waste collection plant, as well as air monitoring and 
         other services. The Company's contract represents the consolidation 
         of numerous individual contracts into one contract to provide cost 
         savings and improve efficiency, a model which is expected to be 
         adopted at additional military bases in the future.
     
     -   AEROSPACE CORPORATION LANDFILLS.  The Company is providing O&M 
         services of wastewater treatment plants to treat leachate from 
         several landfills owned by a private corporation.
     
     -   LARGE AIR FORCE BASE SITE.  The Company is providing O&M services of 
         the facilities' soil biofarm/bioventing systems.

     TELECOMMUNICATIONS SERVICES BUSINESS AREA

     In today's highly mobile society, the ability to communicate rapidly has
become critical to commerce as well as to individual needs.  Technical advances
have improved the ability to communicate voice, video, and data through wireless
telecommunications.  Wireless communications continues to evolve from a
convenience to a modern necessity, and is one of the world's fastest growing
economic sectors.  Tetra Tech provides services to locate and construct the
infrastructure necessary to build and manage communications infrastructure projects.
Our capabilities support this rapidly growing industry.  The Company
also provides programa wide range of technologies including broadband and
wireless communications. Our communications clients seek management services including the application of advanced
siting tools and engineering project management techniques to expedite the
time-critical process of bringing new communication sites online and to upgrade
existing networks with the most advanced technology.

     Tetra Tech currently serves the wireless telecommunications and cable 
television industry segments, and is expanding its services to the broader 
telecommunications industry, including wireless, cable, fiber, satellite, and 
land line local and long distance telephone companies. The Company has 
developed over 15,000 sites and 20 switching areas in five continents, 42 
states, and across Canada. The Company applies state-of-the-art geographic 
mapping technologies to rapidly identify optimal locations for wireless 
antenna sites, and provide complete design and implementation services for 
tower construction. The Company's program management experience enables it to 
bring high quality networks online quickly and cost-effectively, providing a 
competitive advantage to its customers.  The Company's services includeconsulting,
applied science, and management consulting, engineering and architectural design, and construction
management services. Our service offerings in the communications business area
are focused on the following project areas:
 
      NETWORK FEASIBILITY PROJECTS: We apply our technical services to all
      aspects of assessing the feasibility of network systems development,
      expansion and upgrades for our clients. Our experience includes
      feasibility and remote site selection studies, cost-benefit modeling and
      market assessments. We also assist network service providers with
      technical requirements definition, sensitivity/risk analysis and key
      economic projections.
 
      NETWORK PLANNING PROJECTS: We specialize in network planning, including
      short- and long-term network configuration and development planning. We
      develop outside plant designs, civil engineering and regulatory compliance
      assessment and support efforts. In addition, our projects have included
      employment analysis, staffing, logistics, planning, and materials
      provisioning and management.
 
      ProjectNETWORK ENGINEERING PROJECTS: We provide a full range of onsite and
      offsite premises engineering and support services for projects ranging
      from developing computer aided design workprints to field surveys. Our
      experience includes:

     -   SITE DEVELOPMENT OF 415 CELLULAR MOBILE RADIO BASE STATIONS. The 
         Company providedincludes digital evaluation and terrain modeling, right-of-way
      permitting and site acquisition obtained entitlements, 
         supervisedfor wireless and broadband networks. In
      addition, we have performed outside and inside plant design projects for
      twisted pair, coaxial fiber optic and copper cable networks, and wireless
      networks.
 
      NETWORK DEVELOPMENT PROJECTS: We have performed both inside and outside
      plant projects for major network service providers in both the broadband
      and wireless sectors. Our construction projects include urban and long
      haul underground cable installation. We have also applied our capabilities
      to wireless cell site construction and installationaerial cable placement.
 
                                       7

       The following table presents brief examples of equipment, and

                                          11


         provided program management services for a Canadian corporation.
     
     -   SITE DEVELOPMENT FOR CELLULAR TELEPHONE SYSTEM IN INDONESIA.  The 
         Company provided site development consulting services for 
         approximately 174 radio base stations atspecific projects in our
three locations in 
         Indonesia. The Company developed and implemented a written site 
         acquisition process and tracking database. The Company performed 
         civil engineering surveys of all candidate sites to determine site 
         suitability, and provided construction management support. The 
         Company also managed the construction of a 30,000 square feet master 
         switching center and operations office, including the erection of a 
         90 meter tower, installation of all mechanical components and 
         electronics, and installation of switching equipment.

     -   CELLULAR BUILDOUT PROGRAM MANAGER.  The Company performed as the 
         primary program manager, site acquisition and construction firm for 
         McCaw Cellular's initial U.S. cellular buildouts.  The Company was 
         also program manager for systemwide electronic radio base station 
         equipment change-outs in central Florida, south Florida and western 
         Washington for McCaw Cellular.

     -   WORLD'S FIRST ESMR SYSTEM.  The Company acquired and built the 
         world's first ESMR system for Motorola and Nextel Communications.  
         The Company program managed, acquired and built Nextel's initial 
         1,800 site build out.

     -   NATION'S FIRST PCS SYSTEM.  The Company was the primary site 
         acquisition firm for the nation's first PCS system in 
         Washington-Baltimore for American Personalbusiness areas:
 
BUSINESS AREA REPRESENTATIVE PROJECTS - --------------------------- -------------------------------------------------------- Resource Management - Currently conducting a remedial design/remedial action for contaminated groundwater at a Superfund site in Hendersonville, North Carolina for a private corporation. - Currently providing program management and technical support for the Comprehensive Long-term Environmental Action Navy (CLEAN) program under several ten-year contracts. Activities include installation, restoration, base realignment and closure, and underground storage tank programs. - Currently serving as prime contractor for environmental operations and maintenance services at Vandenberg Air Force Base in California. Also providing operations and maintenance services for a wastewater treatment plant and a hazardous waste collection plant, and air monitoring and other services. Infrastructure - Completed the development and analysis of alternative flood control measures for the Los Angeles River. - Currently providing design and program management for Taiwan's National Museum of Marine Biology/Aquarium. Responsible for civil, structural and mechanical engineering and for aquatic life support systems. Designed water, wastewater and parking facilities. - Selected by Texas Parks and Wildlife Department as the prime contractor to plan and develop a new, state-of-the-art, marine fish hatchery and visitor center at Lake Jackson, Texas. Provided design and construction administration, and engineering and bioengineering for all life support systems. Communications - Provided site acquisition, obtained entitlements, supervised construction and installation of equipment, and provided program management services for a Canadian corporation. - Supported the initiative to enhance Emergency 911 services and to improve the dispatch of emergency services to Henrico County near Richmond, Virginia. Assisted in the buildout of the Emergency 911 communications network through installation of antennas, coaxial cables, microwave dishes and elliptical waveguides. - Currently redesigning and reconstructing 25% of Tele- Communications Inc.'s U.S. cable TV networks under a turnkey contract.
CLIENTS The Company hasWe have developed a diverse client base of over 500 current700 clients including Federal, stateboth in the public and local governmentprivate sectors. During fiscal 1998, the DOD, EPA and DOE accounted for 26.2%, 17.1% and 3.5%, respectively, of our net revenue. Although agencies utilities, private companies, professional firms (such as law, consulting and engineering firms) and real estate development firms. As a result of the diversity of the Company's services, it mayFederal government are among our most significant clients, we often support multiple programs within a specificsingle Federal agency. Tetra Tech'sOur private sector clients include companies in the chemical, mining, pharmaceutical, aerospace, automotive, petroleum, telecommunicationscommunications and utility companies.industries. No private sector client accounted for more than 10% of our net revenue in fiscal 1998. 8 The following table presents a list of representative clients in our three primary business areas:
REPRESENTATIVE CLIENTS - --------------------- ------------------------------------------------------------------------------------------- BUSINESS AREA FEDERAL GOVERNMENT STATE, COUNTY AND LOCAL PRIVATE - --------------------- ----------------------------- ----------------------------- ----------------------------- RESOURCE MANAGEMENT U.S. Environmental Protection California Department of Lockheed Martin Corporation; Agency; U.S. Air Force; U.S. Health Services; Washington Merck & Co.; General Electric Navy; U.S. Army; U.S. Coast Department of Ecology; Prince Company; Westwood Squibb Guard; U.S. Forest Service Georges County, Maryland; Pharmaceuticals, Inc. Clarmont County, Ohio; City of San Jose, California INFRASTRUCTURE U.S. Army Corps of Engineers; City of Tucson, Arizona; City Universal Studios, Inc.; U.S. Bureau of Reclamation; of Breckenridge, Colorado; Boeing Corporation; E.I. U.S. Air Force; Federal Washington Department of DuPont de Nemours and Emergency Management Agency Transportation; City of Company; Ford Motor Company Detroit, Michigan; City of Portland, Oregon; Texas Parks and Wildlife Department; King County, Washington; Delaware Department of Transportation; Delaware Department of Corrections COMMUNICATIONS Henrico County, Virginia AT&T Wireless Services; Nextel Communications, Inc.; AirTouch Communications, Inc.; Motorola, Inc.; Sprint Communications Company; TCI
CONTRACTS The Company entersWe enter into various types of contracts with itsour clients, which includeincluding fixed-price, fixed-rate time and materials, cost-reimbursement plus fixed fee and cost-reimbursement plus fixed and award fee contracts. In fiscal 1997, 32.2%1998, 26.1%, 25.4%33.5% and 42.4%40.4% of the Company'sour net revenue was derived from fixed-price, fixed-rate time and materials, and cost-reimbursement plus fixed fee and award fee contracts, respectively. Under a fixed-price contract, the customerclient agrees to pay a specified price for the Company'sour performance of the entire contract. Fixed-price contracts carry certain inherent risks, including risks of losses from underestimating costs, delays in project completion, problems with new technologies and economic and other changes that may occur over the contract period. Consequently, the profitability of fixed-price contracts may vary substantially. The amount of the fee received for a cost-reimbursement plus fixed and award fee contract partially depends upon the government's discretionary periodic assessment of the Company'sour performance on that contract. The Company's fee fromOur various clients determine which type of contract we enter into for a cost-reimbursement plus fixed and award fee contract may vary based upon the Company's performance. Agencies of the Federal government are among the Company's most significant clients. During fiscal 1997, the EPA, DOD and DOE accounted for 16.9%, 27.5% and 4.3%, respectively, of the Company's net revenue.particular engagement. Some contracts made with the Federal government are subject to annual approval of funding. Limitations imposed on spending by Federal government agencies may impose spending restrictions that limit the continued funding of the Company'sour existing contracts with the Federal government and may limit the Company'sour ability to obtain additional contracts. These limitations, if significant, could have a material adverse effect on the Company.us. To date, spending limitations have not had a significant effect on the Company.us. All contracts made with the Federal government may be terminated by the government at any time, with or without cause. 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 among other things, may prevent the Companyus in certain cases from bidding for or performing contracts resulting from or relating to certain work the Company haswe have performed for the government. In addition, 12 services performed for a private client may create conflicts of interest whichthat preclude or limit the Company'sour ability to obtain work for another private entity. The Company attemptsorganization. We attempt to identify actual or potential conflicts of interest and to minimize the 9 possibility that such conflicts would affect itsour work under current contracts or itsour ability to compete for future contracts. The Company has,We have, on occasion, declined to bid on a project because of an existing potential conflict of interest. However, the Company haswe have not experienced disqualification during a bidding or award negotiation process by any government or private client as a result of a conflict of interest. None of the Company's government contracts are subject to renegotiation of profits without a change in the contractual scope of work. All of the Company'sOur contracts with the Federal government are subject to audit by the government, primarily by the Defense Contract Audit Agency (the "DCAA")(DCAA). The DCAA generally seeks to (i)(1) identify and evaluate all activities which either contribute to, or have an impact on, proposed or incurred costs of government contracts; (ii)(2) evaluate the contractor's policies, procedure,procedures, controls and performance; and (iii)(3) prevent or avoid wasteful, careless and inefficient production or service. To accomplish the foregoing,this, the DCAA (i) examines the Company'sour internal control systems, management policies and financial capability, (ii) evaluates the accuracy, reliability and reasonableness of the Company'sour cost representations and records, and (iii) assesses compliance by the Company under its contractsus with Cost Accounting Standards and defective-pricing clauses found within the Federal Acquisition Regulations. The DCAA also performs the annual review of the Company'sour overhead rates and assists in the establishment of the Company'sour final rates. This review focuses on the allowability of cost items as well asand the allocabilityallowability and applicability of Cost Accounting Standards. The DCAA also audits cost-based contracts, including the close-out of those contracts. The DCAA also reviews all types of proposals, including those of award, administration, modification orand repricing. Factors considered are the Company'sour cost accounting system, estimating methods and procedures, and specific proposal requirements. Operational audits are also performed by the DCAA. A review of the Company'sour operations at anyevery major organizationorganizational level that havehas a significant effect on the performance of future government contracts is also conducted during the proposal review period. During the course of its audit, the DCAA may disallow costs if it determines that the Companywe improperly accounted for such costs in a manner inconsistent with Cost Accounting Standards. Under a government contract, only those costs that are reasonable, allocable and allowable are recoverable. A disallowance of costs by the DCAA could have a material adverse effect on us. In September 1995, we acquired PRC Environmental Management, Inc. (EMI). The Defense Contract Audit Agency (DCAA) recently completed an audit of EMI for the Company.fiscal years 1987 through 1995. As a result of the completed audit and our negotiations with the DCAA, the DCAA disallowed approximately $2.9 million in costs. Because we were aware of these issues prior to completing the acquisition, we established a sufficient reserve and, consequently, the disallowance did not have a material adverse effect on our business. Due to the severity of the legal remedies available to the government, including the required payment of damages and/or penalties, criminal and civil sanctions, and debarment, the Company maintainswe maintain controls to avoid the occurrence of fraud and other unlawful activity. In addition, the Company maintainswe maintain preventative audit programs to ensure appropriate control systems and mitigate control weaknesses. The Company provides itsWe provide our services pursuant tounder contracts, purchase orders or retainer letters. CompanyOur policy provides that, where possible, all contracts will be in writing. The Company billsWe bill all of itsour clients periodically based on costs incurred, on either an hourly-fee basis or on a percentage of completion basis, as the project progresses. Generally, Tetra Tech'sour contracts do not require that itwe provide performance bonds. A performance bond, issued by a surety company, guarantees the contractor's performance under the contract. If the contractor defaults under the contract, the surety will, in its discretion, step in to finish 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. To date, the Company haswe have not incurred material damages beyond the coverage of any performance bond. 10 Most of the Company'sour agreements permit termination by the clientclients upon payment of fees and expenses through the date of the termination. MARKETING The Company's marketing activities are managed by theWe utilize both a centralized corporate marketing department which establishes the Company'sand local marketing groups within each of our operating units. Our corporate marketing department assists management in establishing our business plan, our target markets and developsan overall marketing strategies.strategy. The corporate marketing department also identifies and tracks the development of large Federal programs, positions the Companyus for new business areas, selects appropriate partners, if any, for new projects and assists in the bid process for new projects. We market throughout the organizations we target, focusing primarily on senior representatives in government organizations and senior management in private companies. In addition, the corporate marketing department supports marketing activities firm-wide by coordinating corporate promotional and 13 professional activities, including appearances at trade shows, direct mailings, telemarketing and public and media relations. LocalWe also perform marketing activities for the Company are implemented through its over 90our local offices. A local presence enables the Company's professionals to gainWe believe that these offices have a greater knowledgeunderstanding of local environmental issues, and a better understanding of local laws and regulations. Localregulations and, therefore, can better target their marketing activities. These marketing activities are coordinated by full time marketing staff located in certain local offices andof our offices. These activities include meetings with potential clients and localstate, county and municipal regulators, presentations to civic and professional organizations and seminars on current regulatory topics. COMPETITION The market for the Company'sour services is highly competitive. The Company competesWe compete with many other firms, ranging from small local firms to large national firms havingthat may have greater financial and marketing resources than the Company. The Company performsresources. We perform a broad spectrum of engineering and consulting services across a broad spectrum of business areas including facilities management,the resource management, nuclear management, waste management,infrastructure and ground and surface water management. These servicescommunications business areas. Services within these business areas are provided to a customerclient base includingwhich includes Federal (Departmentsagencies, such as the DOD, the DOE, the Department of Defense,the Interior, and Energy; U.S. Environmental Protection Agency;the EPA and the U.S. Post Office),Postal Service, state and local agencies, as well asand the commercialprivate sector. The Company'sOur competition varies and is a function of the business areas in which, and client sectors for which, the Company performs itswe perform our services. The range of competitors for any one procurement can vary from ten to 100 firms, depending upon the relative value of the project, the financial terms and risks associated with the work, and any restrictions placed upon competition by the client. Historically, competition has been based primarily on the quality and timeliness of service. However, the Company believes that price has become an increasingly important competitive factor. The Company believes that its principal competitors include Dames & Moore, Inc., E A Engineering Science & Technology, Inc., EMCON, Ecology & Environment, Inc., Harding Associates, Inc., ICF Kaiser International, Inc., International Technology Corp., TRC Companies, Inc., URS Consultants, Inc. and Roy F. Weston, Inc. BACKLOG At September 28, 1997, Tetra Tech's gross revenue backlog was approximately $217.5 million, compared to $206.3 million at September 29, 1996. The Company includes in gross revenue backlog only those contracts for which funding has been provided and work authorizations have been received. The Company estimates that approximately $192.2 million of the gross revenue backlog at September 28, 1997 will be recognized during fiscal 1998. No assurance can be given that all amounts included in backlog ultimately will be realized, even if evidenced by written contracts. See "Contracts." ENVIRONMENTAL LEGISLATION The demand for the Company's environmental services is a result of public concern over environmental issues and the ensuing legislative response. As a result, the Company's clients have become subject to an increasing number of frequently overlapping Federal, state and local laws concerned with the protection of the environment, as well as regulations promulgated by administrative agencies pursuant to such laws. The Company has provided services to clients with respect to the following Federal statutes and regulations: THE CLEAN WATER ACT. Under the CWA, as amended, a system of permits and enforcement procedures for the discharge of pollutants into waters of the United States from industrial, municipal and other wastewater sources was established. The EPA sets discharge standards for certain wastewater discharges and provides grants to assist municipalities in complying with treatment requirements. In addition, Section 303(d) of the CWA requires all states and authorized Indian tribes to list waters for which these technology-based treatment requirements alone do not assure attainment of water quality standards. States and tribes are then required to develop TMDLs for these water; these TMDLs recommend the additional controls (often for nonpoint source discharges) that will be needed to meet water quality standards. The states and tribes must submit these lists of impaired waters and associated TMDLs to the EPA for approval and, 14 in cases where they are disapproved by the EPA, the CWA requires the EPA to establish the list and/or TMDL for the state or tribe. The CWA requires pretreatment of industrial wastewater before discharge into municipal systems and gives the EPA the authority to set pretreatment limits under certain circumstances. These efforts by the EPA will prompt facility upgrading and better control of industrial discharges. The surface water toxics regulations require states to identify waters adversely affected by toxics and propose control strategies. Promulgated regulations require permits for stormwater discharges for industrial activities and large (populations greater than 100,000) municipal stormwater systems. THE RESOURCE CONSERVATION AND RECOVERY ACT OF 1976. RCRA, as amended by the Hazardous and Solid Waste Amendments of 1984 ("HSWA"), provides a comprehensive scheme for the regulation of hazardous waste from the time of generation to its ultimate disposal (and sometimes thereafter), as well as the regulation of persons engaged in generation, handling, transportation, treatment, storage and disposal of hazardous waste. The RCRA scheme includes both a permitting and a manifest tracking system. With few exceptions, every facility that treats, stores or disposes of hazardous waste must obtain a RCRA permit from the EPA, or a state agency which has been authorized by the EPA to administer the RCRA program, and must comply with certain operating, financial responsibility and disclosure requirements. Although most states have obtained authority to administer this program within their respective states, the applicable state statutes must be at least as stringent as the Federal standards and the Federal government retains enforcement authority. Regulations have been issued pursuant to RCRA in the following areas, among others: permitting assistance, remediation of environmental complications associated with underground storage tanks, municipal solid waste disposal and land disposal of hazardous waste. HSWA also imposes land disposal restrictions on certain listed hazardous wastes which do not meet specified treatment standards, prescribes more stringent standards for hazardous waste disposal sites, sets standards for underground storage tanks and provides for corrective action at or near sites of waste management units. THE COMPREHENSIVE ENVIRONMENTAL RESPONSE, COMPENSATION AND LIABILITY ACT OF 1980. This legislation, as amended by the Superfund Amendments and Reauthorization Act of 1986 ("SARA"), established the Superfund program to identify and clean up inactive hazardous waste sites and provides for penalties and punitive damages for noncompliance with EPA orders. Superfund also covers the emergency cleanup of spills. Superfund may impose strict joint and several liability on certain hazardous substance generators, transporters and disposal facility owners and operators for the costs of removal or remedial action, other necessary response costs and damages for injury, destruction or loss of natural resources, and the cost of any health effects study. Federal funds may be used to pay for the cleanup. SARA provided a separate fund, supported by a tax on gasoline, for the cleanup of leaks from underground storage tanks. In addition, under SARA, the EPA has the mandate to emphasize permanent remedies and treatment at Superfund sites, developing a technology oriented market. THE NATIONAL ENVIRONMENTAL POLICY ACT. NEPA is the basic national charter for protection of the environment. The purpose of NEPA is to guide public officials in making decisions that are based on an understanding of the environmental consequences of those decisions. NEPA requires that an environmental impact statement ("EIS") be prepared for "major federal actions significantly affecting the quality of the human environment." A "major federal action" includes actions with effects that may be major and which are potentially subject to Federal control and responsibility. The term includes legislation proposed by an agency; adoption of agency rules, regulation and policies; adoption of formal plans; and approval of specific Federal projects. In addition, Federal permits, licenses, loans, grants, leases and other Federal actions that are necessary for private developments may require preparation of an EIS, although actual Federal involvement in the activity may be minimal. NEPA requires the EIS to contain a detailed statement on: the environmental impact of the proposed action; any adverse environmental effects which cannot be avoided should the proposal be implemented; alternatives to the proposed action; the relationship between local short-term uses of the environment and the maintenance and enhancement of long-term productivity; and any irreversible and irretrievable commitments of resources which would be involved in the proposed action should it be implemented. 15 In addition to NEPA, several states have adopted legislation requiring environmental impact analysis to be prepared for actions at the state level. THE SAFE DRINKING WATER ACT. Under the SDWA and its subsequent reauthorizations, the EPA is empowered to set drinking water standards for water supply systems in the United States. The SDWA requires that the EPA set maximum groundwater contamination levels for 83 previously unregulated toxic substances and also requires the EPA to establish a priority list every three years of contaminants that may cause adverse health effects and may require regulation. The first priority list was published in January 1988. Water supply systems are required to begin monitoring within defined time limits following the publication of the final regulations. The SDWA also requires that the EPA set criteria specifying when utilities using surface water supplies should filter their water and issue national primary drinking water regulations requiring all utilities to disinfect their water. By June 1993, all surface water supply systems must provide filtration and disinfection. The EPA regulations under the SDWA are expected to result in significant expenditures by water supply systems for evaluation and, ultimately, for upgrading of many facilities. OTHER REGULATIONS. The Company's services are also utilized by its clients in complying with the following Federal laws: the Oil Pollution Act of 1990, the Toxic Substances Control Act, the Clean Air Act, the Emergency Planning and Community Right-to-Know Act of 1986, and the Marine Protection, Research and Sanctuaries Act of 1972. Many states have passed legislation and established policies to cover more detailed aspects of hazardous waste management. The State of California, for example, has consistently been a leader in passing and implementing waste management legislation. These laws, and similar laws in other states, address such topics as air pollution control, underground storage tanks, water quality, solid waste, hazardous materials, surface impoundments, site cleanup and waste discharge. Several states have modeled their environmental laws and regulations on those of California. The Company believes that its experience in California makes it prepared to respond to the regulatory environment in such states. Because much of the Company's resource management business is generated either directly or indirectly as a result of Federal and state governmental programs and regulations, changes in governmental policies affecting such programs, or regulations or administrative actions affecting the funding or sponsorship of such programs, could have a material adverse effect on the Company's business. However, the Company believes that it will benefit from current regulatory initiatives emphasizing risk management, cost/benefit analysis, pollution prevention and source control, and natural resources conservation and disaster planning. POTENTIAL LIABILITY AND INSURANCE Because of the type of projects in which the Company is or may be involved, the Company's current and anticipated future services may involve risks of potential liability under Superfund, common law or contractual indemnification agreements. It is difficult to assess accurately the magnitude of potential risk to the Company. The Company maintains two comprehensive general liability policies, both in the amount of $1,000,000. These amounts, together with two $9,000,000 umbrella policies, provide total general liability coverage of $10,000,000 for the Environmental business and Architecture & Engineering business segments and coverage of $10,000,000 for the Telecommunications business segment. The Company's professional liability insurance ("E&O") policy, which included pollution coverage, for 1997 provided $10,000,000 in coverage for Environmental and Architecture & Engineering, with $100,000 self-insured retention. The same E&O policy covered the Telecommunications segment with a sublimit of $1,000,000 each claim/$1,000,000 aggregate. For 1998, the Company expects to maintain similar coverages as to 1997 for professional services including pollution-related services rendered by the Company. The Company procures insurance coverage through a broker who is experienced in professional liability. The broker, together with the Company's Risk Manager, reviews the Company's risk/insurance programs with those of the Company's competitors and clients. This review, combined with historical experience, claims history and contractual requirements, allows the Company to determine the adequate amount of insurance. However, because there are various exclusions and retentions under the Company's insurance policies, there can be no assurance that all liabilities that may be incurred by the Company are subject to insurance coverage. In addition, the E&O policy is a "claims made" policy which only covers claims made during the term of the policy. If a policy terminates and retroactive coverage is not obtained, a claim subsequently made, even a claim based on events or acts which occurred 16 during the term of the policy, would not be covered by the policy. In the event the Company expands its services into new markets, no assurance can be given that the Company will be able to obtain insurance coverage for such activities or, if insurance is obtained, that the dollar amount of any liabilities incurred in connection with the performance of such services will not exceed policy limits. The premiums paid by the Company for its professional liability policies during fiscal 1997 were approximately $726,000 for E&O. The projected amounts to be paid for fiscal 1998 will be approximately $722,000. EMPLOYEES At September 28, 1997, the Company had 2,262 employees, including 1,508 professionals. The Company's professional staff includes archaeologists, biologists, cartographers, chemists, chemical engineers, civil engineers, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, oceanographers, toxicologists and project managers. The Company's ability to retain and expand its staff of qualified professionals will be an important factor in determining the Company's future growth and success. None of the Company's employees is represented by a labor organization, and management considers its relations with its employees to be good. RISK FACTORS STATEMENTS REGARDING THE COMPANY'S PERFORMANCE PROSPECTS COULD CONTAIN FORWARD-LOOKING INFORMATION THAT INVOLVES RISK AND UNCERTAINTIES SUCH AS THE LEVEL OF DEMAND FOR THE COMPANY'S SERVICES, FUNDING DELAYS FOR PROJECTS, LACK OF REGULATORY CLARITY AFFECTING THE MARKETPLACE AND INDUSTRY-WIDE COMPETITIVE FACTORS. THE FOLLOWING RISK FACTORS SHOULD BE REVIEWED IN ADDITION TO THE OTHER INFORMATION CONTAINED IN THIS ANNUAL REPORT ON FORM 10-K. POTENTIAL LIABILITY AND INSURANCE. Because of the type of projects in which the Company is or may be involved, the Company's current and anticipated future services may involve risks of potential liability under Superfund, common law or contractual indemnification agreements. It is difficult to assess accurately the magnitude of potential risk to the Company. The Company maintains two comprehensive general liability policies, both in the amount of $1,000,000. These amounts, together with two $9,000,000 umbrella policies, provide total general liability coverage of $10,000,000 for the Environmental business and Architecture & Engineering business segments and coverage of $10,000,000 for the Telecommunications business segment. The Company's professional liability insurance ("E&O") policy, which included pollution coverage, for 1997 provided $10,000,000 in coverage for Environmental and Architecture & Engineering, with $100,000 self-insured retention. The same E&O policy covered the Telecommunications segment with a sublimit of $1,000,000 each claim/$1,000,000 aggregate. For 1998, the Company expects to maintain similar coverages as to 1997 for professional services including pollution-related services rendered by the Company. The Company procures insurance coverage through a broker who is experienced in the engineering field. The broker, together with the Company's Risk Manager, reviews the Company's risk/insurance programs with those of the Company's competitors and clients. This review, combined with historical experience, claims history and contractual requirements, allows the Company to determine the adequate amount of insurance. However, because there are various exclusions and retentions under the Company's insurance policies, there can be no assurance that all liabilities that may be incurred by the Company are subject to insurance coverage. In addition, the E&O policy is a "claims made" policy which only covers claims made during the term of the policy. If a policy terminates and retroactive coverage is not obtained, a claim subsequently made, even a claim based on events or acts which occurred during the term of the policy, would not be covered by the policy. In the event the Company expands its services into new markets, no assurance can be given that the Company will be able to obtain insurance coverage for such activities or, if insurance is obtained, that the dollar amount of any liabilities incurred in connection with the performance of such services will not exceed policy limits. The premiums paid by the Company for its professional liability policies during fiscal 1997 were approximately $726,000 for E&O. The projected amounts to be paid for fiscal 1998 will be approximately $722,000. The Company evaluates and determines the risk associated with an uninsured claim. In the event the Company determines that an uninsured claim has potential liability, the Company establishes an appropriate reserve. The Company does not establish a reserve if it determines that the claim has no merit. The Company's historical levels of insurance coverage and reserves have been shown to be adequate. However, a partially or completely 17 uninsured claim, if successful and of significant magnitude, could have a material adverse effect on the Company. SIGNIFICANT COMPETITION. The market for the Company's services is highly competitive. The Company competes with many other firms, ranging from small local firms to large national firms having greater financial and marketing resources than the Company. The Company performs engineering and consulting services across a broad spectrum of business areas, primarily in the resource management, infrastructure, and the telecommunication service business areas. Services within these business areas are provided to a client base including Federal (Departments of Defense, Interior and Energy; U.S Environmental Protection Agency; and the U.S. Post Office), state and local agencies, as well as the commercial sector. The range of competitors for any one procurement can vary from 10 to 100 firms, depending upon the relative value of the project, the financial terms and risks associated with the work, and any restrictions placed upon competition by the customer.client. Historically, competition has beenclients have chosen among competing firms based primarily on the quality and timeliness of the firm's service. However, the Company believeswe believe that price has become an increasingly important competitive factor. The Company believesWe believe that itsif this trend continues it could have a material adverse effect on our operating margins and profitability. We believe that our principal competitors include, in alphabetical order, Black & Veatch LLP; Brown & Caldwell; Castle Tower Corporation; Camp, Dresser & McKee; CH2M Hill Companies Ltd., Dames & Moore Inc., E AGroup; EA Engineering, Science & Technology, Inc.; Earth Tech, Inc.; ICF Kaiser International, Inc., International Technology Corp., TRC Companies,; IT Group Inc., URS; Mastec, Inc.; Montgomery Watson; OSP Consultants, Inc.,; Roy F. Weston, Inc., Castle Tower Corporation; and OSP Consultants, Inc. CONTRACTS. The Company'sURS Greiner Corporation. BACKLOG At October 4, 1998, our gross revenue backlog was approximately $405.0 million, compared to $217.5 million at September 28, 1997. We include in gross revenue backlog only those contracts for which funding has been provided and work authorizations have been received. We estimate that approximately $329.6 million of the gross revenue backlog at October 4, 1998 will be recognized during fiscal 1999. No assurance can be given that all amounts included in backlog will ultimately be realized, even if evidenced by written contracts. For example, certain of our contracts with the Federal 11 government and other clients are terminable at will. If any of these clients terminate their contracts prior to completion, we would not recognize revenue. ENVIRONMENTAL LEGISLATION Our clients have become subject to an increasing number of frequently overlapping Federal, state and local laws concerned with the protection of the environment, as well as regulations promulgated by administrative agencies pursuant to these laws. We provide services with respect to Federal environmental laws, and regulations including: the Clean Water Act; the Resource Conservation and Recovery Act; CERCLA; the National Environmental Policy Act; the Safe Drinking Water Act; and other laws. POTENTIAL LIABILITY AND INSURANCE Our business activities could expose us to potential liability under various environmental laws such as CERCLA. In addition, we occasionally contractually assume liability under indemnification agreements. We cannot predict the magnitude of such potential liabilities. We currently maintain comprehensive general liability, umbrella and professional liability insurance policies. These policies are "claims made" policies. This means that only claims made during the term of the policy are covered. If we terminate our policies and do not obtain retroactive coverage, we would be uninsured for claims made after termination even if based on events or acts that occurred during the term of the policy. We obtain insurance coverage through a broker who is experienced in the engineering field. The broker, together with our Risk Manager, periodically review the adequacy of our insurance programs. However, because there are various exclusions and retentions under our insurance policies, there can be no assurance that all potential liabilities will be covered by our insurance. Further, in the event we expand our services into new markets, we may not be able to obtain insurance coverage for such activities or, if insurance is obtained, the dollar amount of any liabilities incurred could exceed our insurance coverage. We evaluate the risk associated with uninsured claims. If we determine that an uninsured claim has potential liability, we establish an appropriate reserve. A reserve is not established if we determine that the claim has no merit. Our historic levels of insurance coverage and reserves have been adequate. However, a partially or completely uninsured claim, if successful and of significant magnitude, could have a material adverse effect on our business. EMPLOYEES At October 4, 1998, we had 3,662 total employees or 3,077 full-time equivalent employees. Of the 3,662 total employees, 2,144 are professionals. Our professional staff includes archaeologists, biologists, chemical engineers, chemists, civil engineers, computer scientists, economists, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, oceanographers, toxicologists and project managers. Our ability to retain and expand our staff of qualified professionals will be an important factor in determining our future growth and success. Three employees of one of our subsidiaries will be represented by a labor organization. Management considers its relations with our employees to be good. In addition, we supplement our consultants on certain engagements with independent contractors. We believe that the practice of retaining independent contractors on a per engagement basis provides us with significant flexibility in adjusting professional personnel levels in response to changes in demand for our services. 12 RISK FACTORS SOME OF THE INFORMATION IN THIS ANNUAL REPORT ON FORM 10-K CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE SUBSTANTIAL RISKS AND UNCERTAINTIES. YOU CAN IDENTIFY THESE STATEMENTS BY FORWARD-LOOKING WORDS SUCH AS "MAY," "WILL," "EXPECT," "ANTICIPATE," "BELIEVE," "ESTIMATE" AND "CONTINUE" OR SIMILAR WORDS. YOU SHOULD READ STATEMENTS THAT CONTAIN THESE WORDS CAREFULLY BECAUSE THEY: (1) DISCUSS OUR FUTURE EXPECTATIONS; (2) CONTAIN PROJECTIONS OF OUR FUTURE OPERATING RESULTS OR OF OUR FUTURE FINANCIAL CONDITION; OR (3) STATE OTHER "FORWARD-LOOKING" INFORMATION. WE BELIEVE IT IS IMPORTANT TO COMMUNICATE OUR EXPECTATIONS TO OUR INVESTORS. THERE MAY BE EVENTS IN THE FUTURE, HOWEVER, THAT WE ARE NOT ACCURATELY ABLE TO PREDICT OR OVER WHICH WE HAVE NO CONTROL. THE RISK FACTORS LISTED IN THIS SECTION, AS WELL AS ANY CAUTIONARY LANGUAGE IN THIS ANNUAL REPORT ON FORM 10-K, PROVIDE EXAMPLES OF RISKS, UNCERTAINTIES AND EVENTS THAT MAY CAUSE OUR ACTUAL RESULTS TO DIFFER MATERIALLY FROM THE EXPECTATIONS WE DESCRIBE IN OUR FORWARD-LOOKING STATEMENTS. YOU SHOULD BE AWARE THAT THE OCCURRENCE OF ANY OF THE EVENTS DESCRIBED IN THESE RISK FACTORS AND ELSEWHERE IN THIS ANNUAL REPORT ON FORM 10-K COULD HAVE A MATERIAL ADVERSE EFFECT ON OUR BUSINESS, FINANCIAL CONDITION AND OPERATING RESULTS AND THAT UPON THE OCCURRENCE OF ANY OF THESE EVENTS, THE TRADING PRICE OF OUR COMMON STOCK COULD DECLINE. RISKS ASSOCIATED WITH OUR ACQUISITION STRATEGY A significant part of our growth strategy is to acquire other companies that complement our lines of business or that broaden our geographic presence. During fiscal 1998, we purchased ten companies in five separate transactions. We expect to continue to acquire companies as an element of our growth strategy. Acquisitions involve certain risks that could cause our actual growth or operating results to differ from our expectations or the expectations of security analysts. For example: - We may not be able to identify suitable acquisition candidates or to acquire additional companies on favorable terms; - We compete with others to acquire companies. We believe that this competition will increase and may result in decreased availability 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; - We may fail to successfully integrate or manage these acquired companies due to differences in business backgrounds or corporate cultures; - These acquired companies may not perform as we expect; - We may find it difficult to provide a consistent quality of service across our geographically diverse operations; and - If we fail to successfully integrate any acquired company, our reputation could be damaged. This could make it more difficult to market our services or to acquire additional companies in the future. In addition, our acquisition strategy may divert management's attention away from our primary service offerings, result in the loss of key clients or personnel and expose us to unanticipated liabilities. 13 Finally, acquired companies that derive a significant portion of their revenues from the Federal government and that do not follow the same cost accounting policies and billing procedures as we do may be subject to larger cost disallowances for greater periods than we are. If we fail to determine the existence of unallowable costs and 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. FLUCTUATIONS IN OUR QUARTERLY OPERATING RESULTS Our quarterly revenues, expenses and operating results may fluctuate significantly because of a number of factors, including: - The seasonality of the spending cycle of our public sector clients, notably the Federal government; - Employee hiring and utilization rates; - The number and significance of client engagements commenced and completed during a quarter; - Delays incurred in connection with an engagement; - The ability of our clients to terminate engagements without penalties; - The size and scope of engagements; - The timing and size of the return on investment capital; and - General economic and political conditions. Variations in any of these factors could cause significant fluctuations in our operating results from quarter to quarter and could result in net losses. POTENTIAL VOLATILITY OF OUR STOCK PRICE The trading price of our common stock has fluctuated widely. In addition, in recent years the stock market has experienced extreme price and volume fluctuations. The overall market and the price of our common stock may continue to fluctuate greatly. The trading price of our common stock may be significantly affected by various factors, including: - Quarter to quarter variations in our operating results; - Changes in environmental legislation; - Changes in investors' and analysts' perception of the business risks and conditions of our business; - Broader market fluctuations; and - General economic or political conditions. MANAGEMENT OF GROWTH We are growing rapidly. Our 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 operational, financial and human resource 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 of our 14 management to manage our growth effectively or the inability of our employees to achieve anticipated performance or utilization levels, could have a material adverse effect on our business. RELIANCE ON KEY PERSONNEL AND QUALIFIED PROFESSIONALS We depend upon the efforts and skills of our executive officers, senior managers and consultants. With limited exceptions, we do not have employment agreements with any of these individuals. The loss of the services of any of these key personnel could adversely affect our business. Although we have obtained non-compete agreements from the principal stockholders of each of the companies we have acquired, we generally do not have non-compete or employment agreements with key employees who were not equity holders of these companies. We do not maintain key-man life insurance policies on any of our executive officers or senior managers. Our future growth and success depends on our ability to attract and retain qualified scientists and engineers. The market for these professionals is competitive and we may not be able to attract and retain such professionals. DEPENDENCE UPON EXISTING LAWS AND REGULATIONS A significant amount of our resource management business is generated either directly or indirectly as a result of existing Federal and state governmentsgovernmental laws, regulations and someprograms. Any changes in these laws or regulations that reduce funding or affect the sponsorship of its other client contacts are subject to termination atthese programs could reduce the discretiondemand for our services and could have a material adverse effect on our business. CONCENTRATION OF REVENUES Agencies of the client. Some contracts made with the Federal government are subject toamong our most significant clients. During fiscal 1998, approximately 46.8% of our net revenue was derived from three federal agencies as follows: 26.2% of our net revenue was derived from the Department of Defense (DOD), 17.1% from the Environmental Protection Agency (EPA), and 3.5% from the Department of Energy (DOE). Some of our contracts with Federal government agencies require annual funding approval of funding and audits of the Company's rates. Limitations imposed onmay be terminated at their discretion. A reduction in spending by Federal government agencies maycould limit the continued funding of the Company'sour existing contracts with the Federal governmentthem and maycould limit the Company'sour ability to obtain additional contracts. These limitations, if significant, could have a material adverse effect on our business. Additionally the Company. Allfailure of clients to pay significant amounts due us for our services could adversely affect our business. For example, we recently received notification from a federal government agency that we are entitled to payments in excess of our billings. However, the Company'sagency involved must obtain specific funding approval for amounts owed to us and there can be no assurance this funding approval will be obtained. RISKS ASSOCIATED WITH GOVERNMENTAL AUDITS Our contracts with the Federal government and other governmental agencies are subject to auditaudit. Most of these audits are conducted by the government, primarily by the DCAA,Defense Contract Audit Agency (DCAA), which reviews the Company'sour overhead rates, operating systems and cost proposals. During the course of its audit, theThe DCAA may disallow costs if it determines that the Company improperlywe accounted for suchthese costs incorrectly or in a manner inconsistent with Cost Accounting Standards. Historically, the Company has not had any material cost disallowancesA disallowance of costs by the DCAA, asor other governmental auditors, could have a result of audit, however, there can be no assurance that DCAA audits will not result in material cost disallowances in the future.adverse effect on our business. In September 1995, the Companywe acquired Tetra Tech EM Inc. (formerly known as PRC Environmental Management, Inc., "EMI") (EMI). EMI likewisealso contracts with the Federal government agencies and such contracts are also subject to the same auditing standards as thosegovernmental audits. The DCAA has completed audits of the Company. Audits and negotiationsEMI's contracts for the fiscal years 1987 15 through 1992 have recently been completed and cost disallowances as1995. As a result of audit totaledthese audits and our negotiations with the DCAA, the DCAA disallowed approximately $672,000. Negotiations for the 1993 audit are currently underway. Audits for the years 1994 and 1995 have yet to be completed. The Company enters$2.9 million in costs. FIXED PRICE CONTRACTS We enter into various contracts with itsour clients, which includeincluding fixed-price contracts. In fiscal 1997, 32.2%1998, approximately 26.1% of the Company'sour net revenue was derived from fixed-price contracts. Under a fixed-price contract, the customer agrees to pay a specified price for the Company's performance of the entire contract. Fixed-price contracts carry inherentprotect clients and expose us to a number of risks. These risks including risksinclude underestimation of losses from underestimating costs, problems with new technologies, unforeseen costs or difficulties, delays beyond our control and economic and other changes that may occur overduring the contract period. LossesIf we incur losses under fixed-price contracts should they occur,it could have a material adverse effect on our business. DEPENDENCE ON SUBCONTRACTORS Under some of our contracts, we depend on the Company. The Company contracts with both domesticefforts and international customers. Certain contracts with international customers are denominated in a currency other thanskills of subcontractors for the U.S. dollar. Contracts denominated in any currency other than the U.S. dollar containperformance of certain inherent risks, including riskstasks. Our reliance on foreign currency translation and risks in expatriating fundssubcontractors varies from foreign countries.project to project. In fiscal 1997, 3.7%1998, subcontractor costs comprised 22.3% of our gross revenue. The absence of qualified subcontractors with whom we have a satisfactory relationship could adversely affect the quality of our service and our ability to perform under some of our contracts. SIGNIFICANT COMPETITION We provide specialized management consulting and technical services to a broad range of public and private sector clients. The market for our services is highly competitive and we compete with many other firms. These firms range from small regional firms to large national firms which have greater financial and marketing resources than we do. We focus primarily on the resource management, infrastructure and communications business areas. We provide services to our clients which include Federal, state and local agencies, and organizations in the private sector. We compete for projects and engagements with a number of competitors which can vary from 10 to 100 firms. Historically, clients have chosen among competing firms based on the quality and timeliness of the Company's net revenue was derivedfirm's service. We believe, however, that price has become an increasingly important factor. We believe that our principal competitors include, in alphabetical order, Black & Veatch LLP; Brown & Caldwell; Castle Tower Corporation; Camp, Dresser & McKee; CH2M Hill Companies Ltd.; Dames & Moore Group; EA Engineering, Science & Technology, Inc.; Earth Tech, Inc.; ICF Kaiser International, Inc.; IT Group Inc.; Mastec, Inc.; Montgomery Watson; OSP Consultants, Inc.; Roy F. Weston, Inc.; and URS Greiner Corporation. POTENTIAL LIABILITY AND INSURANCE Our services involve significant risks of professional and other liabilities which may substantially exceed the fees we derive from our services. Our business activities could expose us to potential liability under various environmental laws such as the international marketplace comparedComprehensive Environmental Response, Compensation and Liability Act of 1980 (CERCLA). In addition, we sometimes contractually assume liability under indemnification agreements. We cannot predict the magnitude of such potential liabilities. We currently maintain comprehensive general liability, umbrella and professional liability insurance policies. We believe that our insurance policies are adequate for our business operations. These policies are "claims made" policies. Thus, only claims made during the term of the policy are covered. If we terminate our policies and do not obtain retroactive coverage, we would be uninsured for claims made after termination even if these claims are based on events or acts that occurred during 16 the term of the policy. Our insurance may not protect us against liability because our policies typically have various exclusions and retentions. In addition, if we expand into new markets, we may not be able to 1.6%obtain insurance coverage for fiscal 1996. Assuch activities or, if insurance is obtained, the Company's net revenue derived from the international marketplace increases, so increases risks associated in realizing the full contract valuedollar amount of those contracts denominated in foreign currencies. The Company is currently evaluating options to hedge future potential losses from foreign currency transactions.any liabilities incurred could exceed our insurance coverage. A partially or completely uninsured claim, if successful and of significant magnitude, could have a material adverse affect on our business. CONFLICTS OF INTEREST.INTEREST Many of the Company'sour clients are concerned about potential or actual conflicts of interest in retaining environmental consultants and engineers. For example,management consultants. 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, among other things, may prevent the Company in certain casesus from bidding for or performing contracts resulting from or relating to certain work the Company haswe have performed for the government. In addition, services performed for a private client may create a conflict of interest whichthat precludes or limits the 18 Company'sour ability to obtain work from anotherother public or private entity. The Company has,organizations. We have, on occasion, declined to bid on a projectprojects because of an actual orthese conflicts of interest issues. RISKS ASSOCIATED WITH INTERNATIONAL OPERATIONS In fiscal 1998, approximately 3.2% of our net revenue was derived from the international marketplace. Some contracts with our international clients are denominated in foreign currencies. As such, these contracts contain inherent risks including foreign currency exchange risk and the risk associated with expatriating funds from foreign countries. If our international revenue increases, our exposure to foreign currency fluctuations will also increase. We have entered into forward exchange contracts to address foreign currency fluctuations. YEAR 2000 We are working to resolve the potential conflict of interest. However, the Company has not experienced disqualification during a bidding or award negotiation process by any government or private client as a result of a conflict of interest. POTENTIAL VOLATILITY OF STOCK PRICE. The market priceimpact of the Company's common stockyear 2000 on our business operations and the ability of our computerized information systems to accurately process information that may be significantly affected by factors suchdate-sensitive. Any of our programs that recognize a date using "00" as quarter-to-quarter variationsthe year 1900 rather than the year 2000 could result in errors or system failures. We utilize a number of computer programs across our entire operation. The primary information technology systems we utilize are the Company's results of operations, changesaccounting and financial and human resource information management systems. We began our risk assessment in environmental legislation1995. Since that time we have procured and changes in investors' perception of the business risksimplemented certain accounting and conditions in the environmental services business. In addition, market fluctuations,financial reporting systems as well as general economic or political conditions, may adversely affect the market pricecontract administration and billing systems that have been certified as year 2000 compliant by our vendors. Currently, approximately 72% of the Company's common stock, regardless of the Company's actual performance. QUALIFIED PROFESSIONALS. The Company's ability to attractour gross revenue is recognized on these year 2000 compliant systems. We believe that our financial and retain qualified scientistsaccounting and engineers is an important factor in determining the Company's future growth and success. The market for environmental professionals is competitive and there can be no assurance that the Company will continue to be successful in its efforts to attract and retain such professionals. COMPUTER SYSTEMS AND BUSINESS PROCESSES. The Company is currently converting its computer systems and business processes to ensure that its computerhuman resource management information systems will be capableyear 2000 compliant in a timely manner and will not be materially impacted by the year 2000. We may fail, however, in updating our various systems to be year 2000 compliant in a timely manner. We have extensive business with the Federal government. Should the Federal government, especially the Department of processing periods forDefense (DOD), experience significant business interruptions relating to non-year 2000 compliance, our business could be materially impacted. To the extent that other third parties which we rely upon, such as banking institutions, clients and vendors, are unable to address their year 2000 issues in a timely manner, our business could be materially impacted. We believe that the worst case scenario relating to the year 2000 would be an extensive period of time in which the Federal government and beyond as well as ensure that its business processes will beother third parties could not process payments promptly, in addition to our financial institutions not being able to support current and anticipated growth projections. The Company does not anticipate the costssupply us with our working capital needs. 17 Additional risks associated with ensuringnon-year 2000 compliance include: - Our inability to invoice and process payments; - Our inability to produce accurate and timely financials; - The impact on our profitability; and - Our potential liability to third parties for not meeting contracted deliverables. IMPACT OF ANTI-TAKEOVER PROVISIONS ON OUR STOCK PRICE Our certificate of incorporation and by-laws and the Delaware General Corporation Law include provisions that may be deemed to have anti-takeover effects. These anti-takeover effects could delay or prevent a takeover attempt that you or our other stockholders might consider in your or their best interests. In addition, our board of directors is authorized to issue, without obtaining stockholder approval, up to 2,000,000 shares of preferred stock and to determine the price, rights, preferences and privileges of such shares without any further stockholder action. The existence of this "blank-check" preferred stock could make more difficult or discourage an attempt to obtain control of us by means of a tender offer, merger, proxy contest or otherwise. In the future, we may adopt other measures that may have the effect of delaying, deferring or preventing an unsolicited takeover, even if such a change in control were at a premium price or favored by a majority of unaffiliated stockholders. Certain of these capabilities will have a material adverse effect onmeasures may be adopted without any further vote or action by the Company.stockholders. 18 ITEM 2. PROPERTIES. The Company'sOur corporate headquarters facilities are located in Pasadena, California. These facilities contain approximately 25,000 square feet of office space. A portion of these facilitiesspace, and are subject to aleases which expire beyond the year 2001. We lease which expires in February 1998 and gives the Company an option to extend the term for one additional five-year period. Another portion of these facilities is subject to a lease which expires in January 2001. The Company leases office space in approximately 80110 locations in the United States. The CompanyWe also rentsrent some additional office space on a month-to-month basis. The Company believesWe believe that itsour existing facilities are adequate to meet current requirements and that suitable additional or substitute space will be available as needed to accommodate any expansion of operations and for additional offices.operations. ITEM 3. LEGAL PROCEEDINGS. The Company isWe are subject to certain claims and lawsuits typically filed against the engineering and consulting professions, primarily alleging professional errors or omissions. The Company carriesWe carry professional liability insurance, subject to certain deductibles and policy limits against such claims. Management is of the opinionWe believe that the resolution of these claims will not have a material effect on the Company'sour financial position or results of operations. See "Item 1. Business - Potential Liability and Insurance." ITEM 4. SUBMISSIONS OF MATTERS TO A VOTE OF SECURITY HOLDERS. None.On September 14, 1998, we held a special meeting of stockholders to approve an amendment to our Certificate of Incorporation to increase the number of authorized shares of our Common Stock from 30,000,000 to 50,000,000. The number of votes cast concerning this amendment was as follows: For: 14,029,273 Against: 27,397 Absentions: 10,934 Broker non-votes: 0 19 PART II The information required by Items 5 through 8 of this report is set forth on pages 1719 through 3442 of the Company'sour Annual Report to Stockholders for the fiscal year ended September 28, 1997.October 4, 1998. Such information is incorporated in this report and made a part hereof by reference. Item 9 is not applicable. 19 PART III The information required by Items 10 through 13 of this report is set forth in the sections entitled "Security Ownership of Principal Stockholders, Directors and Executive Officers," "Election of Directors," and "Executive Officers, Compensation and Other Information" in the Company'sour Proxy Statement for its 1998our 1999 Annual Meeting of Stockholders. Such information is incorporated in this report and made a part hereof by reference. PART IV ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K. (a) 1. and 2. FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES. 20 The Financial Statements filed as part of this report are listed in the accompanying index at page 24.19. 3. EXHIBITS. 3.1 Restated Certificate of Incorporation of the Company as amended to date (incorporated herein by reference to Exhibit 3.1 to the Company's Annual Report on Form 10-K for the fiscal year ended October 1, 1995). 3.2 Bylaws of the Company as amended to date (incorporated herein by reference to Exhibit 3.2 to the Company's Registration Statement on Form S-1, No. 33-43723). 3.3 Certificate of Amendment of Certificate of Incorporation of the Company (incorporated herein by reference to Exhibit 3.3 to the Company's Annual Report on Form 10-K for the fiscal year ended September 28, 1997). 3.4 Certificate of Amendment of Certificate of Incorporation of the Company. 10.1 Credit Agreement dated as of Sept.September 15, 1995 between the Company and Bank of America Illinois, as amended by the First Amendment to Credit Agreement dated as of Nov.November 27, 1995 (incorporated herein by reference to Exhibit 10.1 to the Company's Annual Report on Form 10-K for the fiscal year ended October 1, 1995). 10.2 Second Amendment dated as of June 20, 1997 to the Credit Agreement dated as of September 15, 1995 between the Company and Bank of America Illinois (incorporated herein by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended June 29, 1997). 10.3 Third Amendment dated as of December 15, 1997 to the Credit Agreement dated as of September 15, 1995 between the Company and Bank of America National Trust and Savings Association (successor in interest(incorporated herein by reference to Exhibit 10.3 to the Company's Annual Report on Form 10-K for the fiscal year ended September 28, 1997). 10.4 Fourth Amendment dated as of January 30, 1997 to the Credit Agreement dated as of September 15, 1995 between the Company and Bank of America Illinois)National Trust and Savings Association. (incorporated herein by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended December 28, 1997). 10.410.5 Fifth Amendment dated as of July 6, 1998 to the Credit Agreement dated as of September 15, 1995 between the Company and Bank of America National Trust and Savings Association. (incorporated herein by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended June 28, 1998). 10.6 Security Agreement dated as of September 15, 1995 among the Company, GeoTrans, Inc., Simons Li & Associates, Inc., Hydro-Search, Inc., PRC Environmental Management, Inc. and Bank of America Illinois (incorporated herein by reference to Exhibit 10.2 to the Company's Annual Report on Form 10-K for the fiscal year ended October 1, 1995). 10.510.7 Pledge Agreement dated as of September 15, 1995 between the Company and Bank of America Illinois (incorporated herein by reference to Exhibit 10.3 to the Company's Annual Report on Form 10-K for the fiscal year ended October 1, 1995). 10.621 10.8 Guaranty dated as of September 15, 1995, executed by the Company in favor of Bank of America Illinois (incorporated herein by reference to Exhibit 10.4 to the Company's Annual Report on Form 10-K for the fiscal year ended October 1, 1995). 20 10.710.9 1989 Stock Option Plan dated as of February 1, 1989 (incorporated herein by reference to Exhibit 10.13 to the Company's Registration Statement on Form S-1, No. 33-43723). 10.810.10 Form of Incentive Stock Option Agreement executed by the Company and certain individuals in connection with the Company's 1989 Stock Option Plan (incorporated herein by reference to Exhibit 10.14 to the Company's Registration Statement on Form S-1, No. 33-43723). 10.910.11 Executive Medical Reimbursement Plan provided to Messrs. Hwang, Rodrigue and Gherini (incorporated herein by reference to Exhibit 10.16 to the Company's Registration Statement on Form S-1, No. 33-43723). 10.1010.12 1992 Incentive Stock Plan (incorporated herein by reference to Exhibit 10.18 to the Company's Annual Report on Form 10-K for the fiscal year ended October 3, 1993). 10.1110.13 Form of Incentive Stock Option Agreement used by the Company in connection with the Company's 1992 Incentive Stock Plan (incorporated herein by reference to Exhibit 10.19 to the Company's Annual Report on Form 10-K for the fiscal year ended October 3, 1993). 10.1210.14 1992 Stock Option Plan for Nonemployee Directors (incorporated herein by reference to Exhibit 10.20 to the Company's Annual Report on Form 10-K for the fiscal year ended October 3, 1993). 10.1310.15 Form of Nonqualified Stock Option Agreement used by the Company in connection with the Company's 1992 Stock Option Plan for Nonemployee Directors (incorporated herein by reference to Exhibit 10.21 to the Company's Annual Report on Form 10-K for the fiscal year ended October 3, 1993). 10.1410.16 1994 Employee Stock Purchase Plan (incorporated herein by reference to Exhibit 10.22 to the Company's Annual Report on Form 10-K for the fiscal year ended October 2, 1994). 10.1510.17 Form of Stock Purchase Agreement used by the Company in connection with the Company's 1994 Employee Stock Purchase Plan (incorporated herein by reference to Exhibit 10.23 to the Company's Annual Report on Form 10-K for the fiscal year ended October 2, 1994). 10.1610.18 Employment Agreement dated as of June 11, 1997 between the Company and Daniel A. Whalen (incorporated herein by reference to Exhibit 10.16 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended June 29, 1997). 10.1710.19 Registration Rights Agreement dated as of June 11, 1997 among the Company and the parties listed on Schedule A attached thereto (incorporated herein by reference to Exhibit 10.17 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended June 29, 1997). 10.1810.20 Registration Rights Agreement dated as of July 11, 1997 among the Company and the parties listed on Schedule A attached thereto. 11. Computationthereto (incorporated herein by reference to Exhibit 10.18 to the Company's Annual Report on Form 10-K for the fiscal year ended September 28, 1997). 22 10.21 Registration Rights Agreement dated as of Net Income Per Common Share. 21 March 26, 1998 among the Company and the parties listed on Schedule A attached thereto (incorporated herein by reference to Exhibit 10.20 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended March 29, 1998). 10.22 Registration Rights Agreement dated as of July 9, 1998 among the Company and the parties listed on Schedule A attached thereto (incorporated herein by reference to Exhibit 10.22 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended June 28, 1998). 10.23 Registration Rights Agreement dated as of September 22, 1998 among the Company and the parties listed on Schedule A attached thereto. 13. Annual Report to Stockholders for the fiscal year ended September 28, 1997,October 4, 1998, portions of which are incorporated by reference in this report as set forth in Part II hereof. With the exception of these portions, such Annual Report is not to be deemed filed as part of this report. 21. Subsidiaries of the Company. 23. Independent Auditors' Consent. 27. Financial Data Schedule. (b) Reports on Form 8-K 1. Current Report on Form 8-K/A (Amendment No. 2)8-K for event of June 11, 1997,September 22, 1998, as filed with the Securities and Exchange Commission on August 25, 1997.October 7, 1998. 2. Current Report on Form 8-K/A (Amendment No. 2)1) for event of June 11, 1997,September 22, 1998, as filed with the Securities and Exchange Commission on September 19, 1997. 22December 1, 1998. 23 SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. TETRA TECH, INC. Date: December 24, 199730, 1998 By: /s/ Li-San Hwang ------------------------------------- Li-San Hwang, Chairman of the Board of Directors, President and Chief Executive Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
SIGNATURE TITLE DATESignature Title Date --------- ----- ---- /s/ Li-San Hwang Chairman of the Board of Directors, December 24, 1997 - ------------------------30, 1998 /s/ Li-San Hwang President and Chief Executive Li-San Hwang Officer - ----------------------------------- (Principal Executive Officer) Li-San Hwang Vice President, Chief Financial Officer December 30, 1998 /s/ James M. Jaska Vice President, Chief Financial December 24, 1997 - ------------------------ Officer and Treasurer (Principal Financial and - ----------------------------------- Accounting Officer) James M. Jaska Financial and Accounting Officer) /s/ Daniel A. Whalen - ------------------------ Director December 24, 199730, 1998 - ----------------------------------- Daniel A. Whalen /s/ J. Christopher Lewis - ------------------------ Director December 24, 199730, 1998 - ----------------------------------- J. Christopher Lewis /s/ Patrick C. Haden - ------------------------ Director December 24, 199730, 1998 - ----------------------------------- Patrick C. Haden /s/ James J. Shelton - ------------------------ Director December 24, 199730, 1998 - ----------------------------------- James J. Shelton
2324 INDEX TO FINANCIAL STATEMENTS The consolidated financial statements, together with the Notes thereto and report thereon of Deloitte & Touche LLP dated November 7, 1997,13, 1998, appearing on pages 2627 through 3441 of the accompanying 19971998 Annual Report to Stockholders, are incorporated by reference in this Annual Report on Form 10-K Annual Report.10-K. With the exception of the aforementioned information and Part II information set forth on pages 1719 through 34,26, the 19971998 Annual Report to Stockholders is not to be deemed filed as part of this report. FINANCIAL STATEMENTSTATEMENTS SCHEDULES Page No. -------- Report of Independent Accountants on Financial Statement SchedulesSchedules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2520 Financial Statement SchedulesSchedule Schedule II --- Valuation and Qualifying Accounts and Reserves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2421 25 INDEPENDENT AUDITORS' REPORT Tetra Tech, Inc.: We have audited the consolidated financial statements of Tetra Tech, Inc. and its subsidiaries as of October 4, 1998 and September 28, 1997, and September 29, 1996, and for each of the three years in the period ended September 28, 1997,October 4, 1998, and have issued our report thereon dated November 7, 1997 (except for Note 5, as to which the date is December 15, 1997);13, 1998; such financial statements and report are included in your 19971998 Annual Report to Stockholders and are incorporated herein by reference. Our audits also included the financial statement schedule of Tetra Tech, Inc. and its subsidiaries, listed in Item 14. This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein. DELOITTE & TOUCHE LLP Los Angeles, California November 7, 1997 (except for Note 5, as to which the date is December 15, 1997) 2513, 1998 26 TETRA TECH, INC. SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES FOR THE FISCAL YEARS ENDED OCTOBER 1, 1995, SEPTEMBER 29, 1996, AND SEPTEMBER 28, 1997 AND OCTOBER 4, 1998
Balance at Additions Charges to Deductions Beginning of through Costs and Net of Balance at Period Acquisitions Expenses Recoveries End of Period ------------- ------------ --------------------- ---------- ----------- ------------- Fiscal year ended October 1, 1995 Allowance for loss on accounts receivable . . . . . . . . . . . . . . $ 1,641,000 $9,635,000 $(56,000) $ (67,000) $11,153,000 Fiscal year ended September 29, 1996 Allowance for loss on accounts receivable . . . . . . . . . . . . . . $11,153,000 $1,365,000 $241,000 $(1,658,000) $11,101,000$ 11,153,000 $ 1,365,000 $ 241,000 $ (1,658,000) $ 11,101,000 Fiscal year ended September 28, 1997 Allowance for loss on accounts receivable . . . . . . . . . . . $ 11,101,000 $ 228,000 $ (56,000) $ (120,000) $ 11,153,000 Fiscal year ended October 4, 1998 Allowance for loss on accounts receivable. . . . $11,101,000. . . . . $ 228,000 $(56,000)11,153,000 $ (120,000) $11,153,0003,187,000 $ (334,000) $ (1,321,000) $ 12,685,000
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