TETRA TECH INC
424B3, 2001-01-09
ENGINEERING SERVICES
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<PAGE>
PROSPECTUS

                                TETRA TECH, INC.
                         296,667 SHARES OF COMMON STOCK

                            ------------------------

    The stockholders of Tetra Tech, Inc. listed herein are offering and selling
296,667 shares of Common Stock of Tetra Tech, Inc. under this prospectus.

                            ------------------------

           INVESTING IN TETRA TECH, INC. COMMON STOCK INVOLVES RISKS.
                     SEE RISK FACTORS BEGINNING ON PAGE 2.

                            ------------------------

    The selling stockholders obtained their shares of Common Stock on
December 21, 2000 in connection with Tetra Tech, Inc.'s acquisition of Rocky
Mountain Consultants, Inc. as of December 21, 2000. Some or all of the selling
stockholders expect to sell their shares.

    The selling stockholders may offer their shares of Common Stock through
public or private transactions, on or off the Nasdaq National Market, at
prevailing market prices, or at privately negotiated prices.

                            ------------------------

    Tetra Tech, Inc. Common Stock is traded on the Nasdaq National Market under
the symbol "TTEK." On January 8, 2001, the closing price of the Common Stock on
the Nasdaq National Market was $26.8125 per share.

                            ------------------------

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED THESE SECURITIES, OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                            ------------------------

                 THE DATE OF THIS PROSPECTUS IS JANUARY 8, 2001
<PAGE>
                                  THE COMPANY

    Tetra Tech, Inc. is a leading provider of specialized management consulting
and technical services in three principal business areas: resource management,
infrastructure and communications. 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. These technical services, which implement solutions,
include research and development, applied science, engineering and architectural
design, construction management, and operations 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 6,500
employees worldwide, of which approximately 6,400 are located in North America
in more than 150 locations. In addition, we have established a presence in Asia,
South America and Europe.

    Our principal executive offices are located at 670 North Rosemead Boulevard,
Pasadena, California 91107, and our telephone number is (626) 351-4664. Our
website is located at www.tetratech.com. Information contained in our website is
not a part of this prospectus.

                                USE OF PROCEEDS

    The selling stockholders are offering all of the shares of Common Stock
covered by this prospectus. We will not receive any proceeds from the sales of
these shares.

                                  RISK FACTORS

    AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED BY THIS PROSPECTUS
INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CAREFULLY REVIEW THE FOLLOWING RISK
FACTORS AS WELL AS THE OTHER INFORMATION SET FORTH IN THIS PROSPECTUS BEFORE
MAKING AN INVESTMENT.

    SOME OF THE INFORMATION IN THIS PROSPECTUS OR INCORPORATED BY REFERENCE IN
THIS PROSPECTUS 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 PROSPECTUS, 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. BEFORE YOU INVEST IN
OUR COMMON STOCK, YOU SHOULD BE AWARE THAT THE OCCURRENCE OF ANY OF THE EVENTS
DESCRIBED IN THESE RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS 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 AND YOU COULD LOSE ALL OR PART OF YOUR
INVESTMENT.

THERE ARE RISKS ASSOCIATED WITH OUR ACQUISITION STRATEGY THAT COULD ADVERSELY
IMPACT OUR BUSINESS AND OPERATING RESULTS

    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 2000, we purchased nine companies in eight separate transactions. We
expect to continue to acquire companies as an element of our growth

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<PAGE>
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. Competition may increase and
      may result in decreased availability of or increased price for suitable
      acquisition candidates;

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

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

    - 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.

    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 typically encounter. 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.

OUR QUARTERLY OPERATING RESULTS MAY FLUCTUATE SIGNIFICANTLY, WHICH COULD HAVE A
NEGATIVE EFFECT ON THE PRICE OF OUR COMMON STOCK

    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 and the
      spending patterns of our private sector clients;

    - 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 clients to terminate engagements without penalties;

    - The size and scope of engagements;

    - The timing of expenses incurred for corporate initiatives;

    - The timing and size of the return on investment capital; and

    - General economic and political conditions.

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<PAGE>
Variations in any of these factors could cause significant fluctuations in our
operating results from quarter to quarter and could result in net losses.

THE VALUE OF OUR COMMON STOCK COULD CONTINUE TO BE VOLATILE

    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.

IF WE ARE NOT ABLE TO SUCCESSFULLY MANAGE OUR GROWTH STRATEGY, OUR BUSINESS AND
RESULTS OF OPERATIONS MAY BE ADVERSELY AFFECTED

    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 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.

THE LOSS OF KEY PERSONNEL OR OUR INABILITY TO ATTRACT AND RETAIN QUALIFIED
PERSONNEL COULD SIGNIFICANTLY DISRUPT OUR BUSINESS

    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 certain principals and stockholders of
companies we have acquired, we generally do not have non-compete or employment
agreements with key employees who were not once 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.

CHANGES IN EXISTING LAWS AND REGULATIONS COULD REDUCE THE DEMAND FOR OUR
SERVICES

    A significant amount of our resource management business is generated either
directly or indirectly as a result of existing Federal and state governmental
laws, regulations and programs. Any changes in these laws or regulations that
reduce funding or affect the sponsorship of these programs could reduce the
demand for our services and could have a material adverse effect on our
business.

                                       4
<PAGE>
OUR REVENUES FROM AGENCIES OF THE FEDERAL GOVERNMENT ARE CONCENTRATED, AND A
REDUCTION IN SPENDING BY THESE AGENCIES COULD ADVERSELY AFFECT OUR BUSINESS AND
OPERATING RESULTS

    Agencies of the Federal government are among our most significant clients.
During fiscal 2000, approximately 29.1% of our net revenue was derived from
Federal agencies, of which 15.1% was derived from the Department of Defense
(DOD), 9.4% from the Environmental Protection Agency (EPA), 2.2% from the
Department of Energy (DOE), and 2.4% from various other Federal government
agencies. Some contracts with Federal government agencies require annual funding
approval and may be terminated at their discretion. A reduction in spending by
Federal government agencies could limit the continued funding of our existing
contracts with them and could limit our ability to obtain additional contracts.
These limitations, if significant, could have a material adverse effect on our
business.

    Additionally, the failure 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 agency involved must obtain
specific funding approval for amounts owed to us and there can be no assurance
this funding approval will be obtained.

OUR CONTRACTS WITH GOVERNMENTAL AGENCIES ARE SUBJECT TO AUDIT, WHICH COULD
RESULT IN THE DISALLOWANCE OF CERTAIN COSTS

    Contracts with the Federal government and other governmental agencies are
subject to audit. Most of these audits are conducted by the Defense Contract
Audit Agency (DCAA), which reviews our overhead rates, operating systems and
cost proposals. The DCAA may disallow costs if it determines that we accounted
for these costs incorrectly or in a manner inconsistent with Cost Accounting
Standards. A disallowance of costs by the DCAA, or other governmental auditors,
could have a material adverse effect on our business.

OUR BUSINESS AND OPERATING RESULTS COULD BE ADVERSELY AFFECTED BY LOSSES UNDER
FIXED-PRICE CONTRACTS OR TERMINATION OF CONTRACTS AT THE CLIENT'S DISCRETION

    We contract with Federal and state governments as well as with the
commercial sector. These contracts are often subject to termination at the
discretion of the client with or without cause. Additionally, we enter into
various types of contracts with our clients, including fixed-price contracts. In
fiscal 2000, approximately 42.9% of our net revenue was derived from fixed-price
contracts. Fixed-price contracts protect clients and expose us to a number of
risks. These risks include underestimation of costs, problems with new
technologies, unforeseen costs or difficulties, delays beyond our control and
economic and other changes that may occur during the contract period. Losses
under fixed-price contracts or termination of contracts at the discretion of the
client could have a material adverse effect on our business.

OUR INABILITY TO FIND QUALIFIED SUBCONTRACTORS COULD ADVERSELY AFFECT THE
QUALITY OF OUR SERVICE AND OUR ABILITY TO PERFORM UNDER CERTAIN CONTRACTS

    Under some of our contracts, we depend on the efforts and skills of
subcontractors for the performance of certain tasks. Reliance on subcontractors
varies from project to project. During fiscal 2000, subcontractor costs
comprised 24.7% 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.

                                       5
<PAGE>
OUR INDUSTRY IS HIGHLY COMPETITIVE AND WE MAY BE UNABLE TO COMPETE EFFECTIVELY

    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 ours.

    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 firm'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; CH2M Hill
Companies Ltd.; Earth Tech, Inc.; IT Group Inc.; Mastec, Inc.; Montgomery
Watson; o2wireless Solutions, Inc.; Quanta Services; Roy F. Weston, Inc.;
Science Applications International Corporation; URS Corporation and Wireless
Facilities, Inc.

OUR SERVICES EXPOSE US TO SIGNIFICANT RISKS OF LIABILITY AND OUR INSURANCE
POLICIES MAY NOT PROVIDE ADEQUATE COVERAGE

    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 Comprehensive 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. Professional liability
policies are "claims made" policies. Thus, only claims made during the term of
the policy are covered. Should we terminate our professional liability policy
and 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 the term of the policy. Additionally, our insurance policies may not
protect us against potential liability due to various exclusions and retentions.
In addition, if we expand 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.
Partially or completely uninsured claims, if successful and of significant
magnitude, could have a material adverse affect on our business.

WE MAY BE PRECLUDED FROM PROVIDING CERTAIN SERVICES DUE TO CONFLICT OF INTEREST
ISSUES

    Many of our clients are concerned about potential or actual conflicts of
interest in retaining management consultants. 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 us from bidding for or
performing contracts resulting from or relating to certain work we have
performed for the government. In addition, services performed for a private
client may create a conflict of interest that precludes or limits our ability to
obtain work from other public or private organizations. We have, on occasion,
declined to bid on projects because of these conflicts of interest issues.

                                       6
<PAGE>
OUR INTERNATIONAL OPERATIONS EXPOSE US TO RISKS SUCH AS FOREIGN CURRENCY
FLUCTUATIONS

    During fiscal 2000, 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
periodically enter into forward exchange contracts to address certain foreign
currency fluctuations.

                              SELLING STOCKHOLDERS

    We acquired Rocky Mountain Consultants, Inc., a Colorado corporation (RMC),
as of December 21, 2000 through the merger of RMC with and into TDH Acquisition
Corporation, a Delaware corporation and our wholly-owned subsidiary. In
connection with this acquisition, we issued to the RMC shareholders an aggregate
of 296,667 shares of our Common Stock.

    Under a Registration Rights Agreement dated as of December 21, 2000, we
agreed to register the shares of Common Stock issued to the former RMC
shareholders and to use commercially reasonable efforts to keep the registration
statement effective until the date on which all selling stockholders may sell
their shares of Common Stock under Rule 144 promulgated under the Securities Act
of 1933, as amended (the "Securities Act"), without any volume limitation. Our
registration of the shares of Common Stock does not necessarily mean that the
selling stockholders will sell all or any of the shares.

    The shares listed below represent all of the shares that each selling
stockholder currently owns of our Common Stock. Except as otherwise noted, we
know of no agreements among our stockholders which relate to voting or
investment power over our Common Stock. Except as otherwise noted, the address
of each selling stockholder is c/o Rocky Mountain Consultants, Inc., 825
Delaware Avenue, Longmont, Colorado.

<TABLE>
<CAPTION>
                                                                 SHARES
                                                              BENEFICIALLY              NUMBER OF
                                                              OWNED PRIOR                SHARES
NAMES                                                         TO OFFERING      %(1)      OFFERED
-----                                                         ------------   --------   ---------
<S>                                                           <C>            <C>        <C>
Daniel V. Ault..............................................     44,500         *        44,500
Don W. Deere................................................     44,500         *        44,500
Thomas J. Hesemann..........................................     44,500         *        44,500
Mark Klee...................................................     29,667         *        29,667
L. Stephen Schmidt..........................................     44,500         *        44,500
Jennifer E. Vecchi..........................................     44,500         *        44,500
Leonard R. Wilson...........................................     44,500         *        44,500
</TABLE>

------------------------

*   Represents less than 1% of the outstanding shares of Common Stock.

    The selling stockholders listed above are employees of RMC. No selling
stockholder has had any material relationship with us, or any of our
predecessors or affiliates, other than as an employee. Because the selling
stockholders may sell all or part of their shares of Common Stock offered
hereby, no estimate can be given as to the number of shares of Common Stock that
will be held by any selling stockholder upon termination of any offering made
hereby.

                                       7
<PAGE>
                              PLAN OF DISTRIBUTION

    We are registering the shares of Common Stock on behalf of the selling
stockholders. As used herein, "selling stockholders" includes donees and
pledgees selling shares received from a named selling stockholder after the date
of this Prospectus. This Prospectus may also be used by transferees of the
selling stockholders or by other persons acquiring shares, including brokers who
borrow the shares to settle short sales of shares of Common Stock. We will bear
all costs, expenses and fees in connection with the registration of the shares
offered hereby. The selling stockholders will bear brokerage commissions and any
similar selling expenses associated with the sale of shares.

    The selling stockholders may offer their shares of Common Stock at various
times in one or more of the following transactions:

    - on the Nasdaq National Market;

    - in the over-the-counter market;

    - in transactions other than on the Nasdaq National Market or in the
      over-the-counter market;

    - in connection with short sales of the shares of Common Stock;

    - by pledge to secure debts and other obligations;

    - in connection with the writing of non-traded and exchange-traded call
      options, in hedge transactions and in settlement of other transactions in
      standardized or over-the-counter options; or

    - in any combination of any of the above transactions.

    In connection with hedging transactions, broker-dealers or other financial
institutions may engage in short sales of the Common Stock in the course of
hedging the positions they assume with selling stockholders. The selling
stockholders may also enter into options or other transactions with broker-
dealers or other financial institutions, which require the delivery to such
broker-dealer or other financial institution of the shares offered hereby, which
shares may be resold pursuant to this prospectus (as supplemented or amended to
reflect such transaction).

    The selling stockholders may sell their shares at market prices prevailing
at the time of sale, at prices related to such prevailing market prices, at
negotiated prices or at fixed prices. The selling stockholders may use
broker-dealers to sell their shares. If this happens, broker-dealers will either
receive discounts or commissions from purchasers of shares for whom they acted
as agents.

    The selling stockholders have advised us that they have not entered into any
agreements, understandings or arrangements with any underwriters or
broker-dealers regarding the sale of their securities, nor is there an
underwriter or coordinating broker acting in connection with the proposed sale
of shares by the selling stockholders.

    The selling stockholders and any broker-dealers that act in connection with
the sale of shares might be deemed to be "underwriters" within the meaning of
Section 2(11) of the Securities Act, and any commissions received by such
broker-dealers and any profit on the resale of the shares sold by them while
acting as principals might be deemed to be underwriting discounts or commissions
under the Securities Act. We have agreed to indemnify each selling stockholder
against certain liabilities, including liabilities arising under the Securities
Act. The selling stockholders may agree to indemnify any agent, dealer or
broker-dealer that participates in transactions involving sales of the shares
against certain liabilities, including liabilities arising under the Securities
Act.

    Because the selling stockholders may be deemed to be "underwriters" within
the meaning of Section 2(11) of the Securities Act, the selling stockholders
will be subject to the prospectus delivery requirements of the Securities Act.
We have informed the selling stockholders that the

                                       8
<PAGE>
anti-manipulative provisions of Regulation M promulgated under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), may apply to their sales
in the market.

    The selling stockholders also may resell all or a portion of the shares in
open market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conform to the requirements of such Rule.

    Upon being notified by a selling stockholder that any material arrangement
has been entered into with a broker-dealer for the sale of shares through a
block trade, special offering, exchange distribution or secondary distribution
or a purchase by a broker or dealer, we will file a supplement to this
Prospectus, if required, pursuant to Rule 424(b) under the Securities Act,
disclosing (i) the name of each such selling stockholder and of the
participating broker-dealer(s), (ii) the number of shares involved, (iii) the
price at which such shares were sold, (iv) the commissions paid or discounts or
concessions allowed to such broker-dealer(s), where applicable, and (v) other
facts material to the transaction. In addition, upon being notified by a selling
stockholder that a donee or pledgee intends to sell more than 500 shares, we
will file a supplement to this Prospectus.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and special reports, proxy statements and other
information with the Securities and Exchange Commission (SEC). You may read and
copy any document we file at the SEC's public reference room at 450 Fifth
Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for
further information on the public reference room. Our SEC filings are also
available to the public from the SEC's Website at "http: //www.sec.gov."

    The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by referring
you to those documents. The information incorporated by reference is considered
to be part of this prospectus, and information that we file later with the SEC
will automatically update and supersede this information. We incorporate by
reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act:

    1.  Annual Report on Form 10-K for the fiscal year ended October 1, 2000, as
       filed with the SEC on December 29, 2000;

    2.  Preliminary Proxy Statement as filed with the SEC on January 2, 2001,
       for the 2001 Annual Meeting of Stockholders; and

    3.  The description of the Common Stock set forth in the Registration
       Statement on Form 8-A dated November 13, 1991, including any amendments
       or reports filed for the purpose of updating such description.

    You may request a copy of these filings, at no cost, by writing or
telephoning James M. Jaska as follows:

<TABLE>
<S>                           <C>
                              Tetra Tech, Inc.
                              Attention: Investor Relations
                              670 North Rosemead Boulevard
                              Pasadena, California 91107
                              (626) 351-4664
</TABLE>

    This prospectus is part of a registration statement we filed with the SEC.
You should rely only on the information or representations provided in this
prospectus. We have authorized no one to provide you with different information.
We are not making an offer of these securities in any state where the

                                       9
<PAGE>
offer is not permitted. You should not assume that the information in this
prospectus is accurate as of any date other than the date on the front of the
document.

                                 LEGAL MATTERS

    The validity of the Common Stock offered hereby will be passed on for us by
Riordan & McKinzie, a Professional Corporation, Los Angeles, California. Certain
principals of Riordan & McKinzie own shares of Common Stock.

                                    EXPERTS

    The financial statements and the related financial statement schedule
incorporated in this prospectus by reference from our Annual Report on
Form 10-K for the year ended October 1, 2000 have been audited by Deloitte &
Touche LLP, independent auditors, as stated in their reports, which are
incorporated herein by reference, and have been so incorporated in reliance upon
the reports of such firm given upon their authority as experts in accounting and
auditing.

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