TETRA TECH INC
DEF 14A, 1998-01-09
ENGINEERING SERVICES
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<PAGE>
                                     [LOGO]
 
                            ------------------------
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                          TO BE HELD FEBRUARY 11, 1998
 
                            ------------------------
 
To the Stockholders of
 
  TETRA TECH, INC.:
 
    The Annual Meeting of the Stockholders (the "Meeting") of Tetra Tech, Inc.,
a Delaware corporation (the "Company"), will be held on Wednesday, February 11,
1998 at 10:00 a.m., Pacific Standard Time, at The Pasadena Hilton located at 150
S. Los Robles Avenue, Pasadena, California 91101, for the following purposes as
described in the accompanying Proxy Statement:
 
    1.  To elect five directors to the Board of Directors of the Company to
       serve for a term of one year and until their successors are duly elected
       and qualified.
 
    2.  To transact such other business as may properly come before the Meeting
       or any adjournment thereof.
 
    The Board of Directors has fixed the close of business on December 9, 1997
as the record date for the determination of stockholders entitled to vote at the
Meeting or any adjournment or adjournments thereof, and only record holders of
the Company's common stock at the close of business on that day will be entitled
to vote. A copy of the Company's 1997 Annual Report is enclosed with this Notice
but is not to be considered part of the proxy soliciting material.
 
    Each stockholder is cordially invited to be present and to vote in person at
the Meeting. TO ASSURE REPRESENTATION AT THE MEETING, HOWEVER, STOCKHOLDERS ARE
URGED TO SIGN AND RETURN THE ENCLOSED PROXY CARD AS PROMPTLY AS POSSIBLE IN THE
POSTAGE PREPAID ENVELOPE ENCLOSED FOR THAT PURPOSE. Any stockholder attending
the Meeting may vote in person even if he or she previously returned a proxy.
 
                                          By Order of the Board of Directors
 
                                          /s/ Richard A. Lemmon
 
                                          Richard A. Lemmon
                                          VICE PRESIDENT AND SECRETARY
 
Pasadena, California
 
January 12, 1998
<PAGE>
                                     [LOGO]
 
                            ------------------------
 
                          670 NORTH ROSEMEAD BOULEVARD
                           PASADENA, CALIFORNIA 91107
 
                            ------------------------
 
                                PROXY STATEMENT
                               ------------------
 
                              GENERAL INFORMATION
 
    This Proxy Statement is being sent on or about January 12, 1998 in
connection with the solicitation of proxies by the Board of Directors of Tetra
Tech, Inc., a Delaware corporation (the "Company"). The proxies are for use at
the 1998 Annual Meeting of Stockholders of the Company (the "Meeting"), which
will be held at 10:00 a.m., Pacific Standard Time, on Wednesday, February 11,
1998, at The Pasadena Hilton located at 150 S. Los Robles Avenue, Pasadena,
California 91101, and at any meetings held upon adjournment thereof. The record
date for the Meeting is the close of business on December 9, 1997 (the "Record
Date"), and all holders of record of the Company's common stock, $.01 par value
per share (the "Common Stock"), on the Record Date are entitled to notice of the
Meeting and to vote at the Meeting and any meetings held upon adjournment
thereof.
 
    A proxy form is enclosed. Whether or not you plan to attend the Meeting in
person, please date, sign and return the enclosed proxy as promptly as possible,
in the postage prepaid envelope provided, to insure that your shares will be
voted at the Meeting. Any stockholder who returns a proxy in such form has the
power to revoke it at any time prior to its effective use by filing an
instrument revoking it or a duly executed proxy bearing a later date with the
Secretary of the Company or by attending the Meeting and voting in person.
Unless contrary instructions are given, any such proxy, if not revoked, will be
voted at the Meeting: (a) for the Board of Directors' slate of nominees; and (b)
as recommended by the Board of Directors with regard to all other matters, in
its discretion.
 
    The voting securities of the Company are the outstanding shares of Common
Stock. At the Record Date, the Company had 22,268,958 shares of Common Stock
outstanding. For each share of Common Stock held on the Record Date, a
stockholder is entitled to one vote on all matters to be considered at the
Meeting. The Company's Certificate of Incorporation, as amended, does not
provide for cumulative voting. In the election of directors, the five candidates
who receive the highest number of affirmative votes will be elected. Votes
against a candidate and votes withheld have no legal effect. In matters other
than the election of directors, abstentions are counted as votes against in
tabulations of the votes cast on proposals presented to stockholders, whereas
broker non-votes are not counted for purposes of determining whether a proposal
has been approved.
 
    The cost of preparing, assembling, printing and mailing this Proxy Statement
and the accompanying form of proxy, and the cost of soliciting proxies relating
to the Meeting, will be borne by the Company. The Company may request banks and
brokers to solicit their customers who beneficially own Common Stock listed of
record in names of nominees, and will reimburse such banks and brokers for their
reasonable out-of-pocket expenses of such solicitations. The original
solicitation of proxies by mail may be supplemented by telephone, telegram and
personal solicitation by officers, directors and regular employees of the
Company, but no additional compensation will be paid to such individuals.
 
                                       1
<PAGE>
                                 PROPOSAL NO. 1
                             ELECTION OF DIRECTORS
 
    The Company presently has five directors, all of whom are elected annually.
At the Meeting, the term of office of all directors currently holding office
will expire and five directors will be elected to serve for a term of office
consisting of the ensuing year and until their respective successors are elected
and qualified. Accordingly, the Board of Directors intends to nominate the five
incumbent directors named below for election as directors. Each nominee has
consented to being named in this Proxy Statement as a nominee for election as
director and has agreed to serve as a director if elected.
 
    The persons named as proxies in the accompanying form of proxy have advised
the Company that they intend at the Meeting to vote the shares covered by the
proxies for the election of the nominees named below. If any one or more of such
nominees are unable to serve or for good cause will not serve, the persons named
as proxies in the accompanying form of proxy may vote for the election of such
substitute nominees as the Board of Directors may propose. The accompanying form
of proxy contains a discretionary grant of authority with respect to this
matter. The persons named as proxies in the accompanying form of proxy may not
vote for a greater number of persons than the number of nominees named herein.
 
    No arrangement or understanding exists between any nominee and any other
person or persons pursuant to which any nominee was or is to be selected as a
director or nominee. None of the nominees have any family relationship among
themselves or with any executive officer of the Company.
 
NOMINEES
 
    The nominees of the Board of Directors are listed below, together with their
ages, certain biographical information and all positions and offices with the
Company held by them.
 
<TABLE>
<CAPTION>
      NAME                                                  AGE                            POSITION
                                                            ---      ----------------------------------------------------
<S>                                                     <C>          <C>
Li-San Hwang..........................................          62   Chairman of the Board of Directors, President and
                                                                       Chief Executive Officer
 
Daniel A. Whalen......................................          50   Director, Executive Vice President of
                                                                       Telecommunications Services
 
J. Christopher Lewis..................................          41   Director
 
Patrick C. Haden                                                44   Director
 
James J. Shelton......................................          81   Director
</TABLE>
 
    Dr. Hwang joined the Company's predecessor in 1967 and has held his present
positions since the acquisition by the Company of the Water Management Group of
Tetra Tech, Inc., a subsidiary of Honeywell, Inc., in March 1988 (the
"Acquisition"). He was named Director of Engineering at the Company in 1972 and
a Vice President in 1974. Prior to the Acquisition, Dr. Hwang was Senior Vice
President of Operations and was responsible for the development and expansion of
the current business base. He has served as an advisor to numerous government
and professional society committees and has published extensively in the field
of water resources. Dr. Hwang is a graduate of the National Taiwan University,
Michigan State University and the California Institute of Technology, holding
B.S., M.S. and Ph.D. degrees, respectively, in Civil Engineering, specializing
in water resources.
 
    Mr. Whalen, Executive Vice President of Telecommunications Services of the
Company and President of Whalen & Company, Inc. ("WAC"), joined the Company and
the Board upon the merger of the Company and WAC in June 1997. Prior to founding
WAC in 1987, Mr. Whalen co-founded and served as an executive officer of First
Cellular Group, Inc., The Microwave Group, Inc., Network Building & Consulting,
Inc., and Cellular Development Company. Earlier he was Vice President-Operations
of
 
                                       2
<PAGE>
American TeleServices, Inc. and Director of Operations of NYNEX Mobile Services.
Mr. Whalen earned a B.S. degree from St. John's University and M.A. and M.B.A.
degrees from Stanford University.
 
    Mr. Lewis has been a member of the Board of Directors of the Company since
February 1988. Since 1982, Mr. Lewis has been a general partner of Riordan,
Lewis & Haden, a Los Angeles-based partnership which invests in management
buy-out and venture capital transactions. Mr. Lewis also serves as a director of
Data Processing Resources Corporation, California Beach Restaurants, Inc., PIA
Merchandising Services, Inc. and several privately-held companies.
 
    Mr. Haden has been a member of the Board of Directors of the Company since
December 1, 1992. Mr. Haden is a general partner of Riordan, Lewis & Haden,
which he joined in 1987. Mr. Haden also serves as a director of PIA
Merchandising Services, Inc., Data Processing Resources Corporation and several
privately-held companies.
 
    Mr. Shelton has been a member of the Board of Directors of the Company since
March 1995. Mr. Shelton is a self-employed investor and venture capitalist. He
is the former (retired) President of the Baker Drilling Equipment Co., and
formerly served as the Director of Corporate Relations and a director of Baker
Hughes Incorporated (formerly Baker International Corp.).
 
INFORMATION REGARDING THE BOARD OF DIRECTORS AND ITS COMMITTEES
 
    The Company's Board of Directors met four times during the fiscal year ended
September 28, 1997. Each of the Company's directors attended 75% or more of the
total number of meetings of the Board of Directors and meetings of the
committees of the Board of Directors on which he served (during the period
within which he was a director or member of such committee) during the fiscal
year ended September 28, 1997.
 
    The Company has an Audit Committee which, during the fiscal year ended
September 28, 1997, was comprised of Messrs. Lewis and Haden. The function of
the Audit Committee is to consult and meet with the Company's auditors and its
Chief Financial Officer and other finance and accounting personnel, review
potential conflict of interest situations, where appropriate, and report and
make recommendations to the full Board of Directors regarding such matters. The
Audit Committee met twice during the fiscal year ended September 28, 1997.
 
    The Company has a Compensation Committee which, during the fiscal year ended
September 28, 1997, consisted of Messrs. Lewis and Haden. The Compensation
Committee reviews the compensation of the Company's Chief Executive Officer and
reviews the recommendations of the Chief Executive Officer relating to
compensation of certain of the Company's other senior executive officers. The
Compensation Committee also establishes policies relating to the compensation of
Company executive officers and other key employees and administers the Company's
stock option plans. The Compensation Committee held one meeting during fiscal
year 1997. Neither Mr. Haden nor Mr. Lewis was at any time during the fiscal
year ended September 28, 1997 or at any other time an officer or employee of the
Company.
 
    The Company does not have a standing nominating committee or any committee
performing the functions thereof.
 
    No executive officer of the Company serves as a member of the Board of
Directors or Compensation Committee of any other entity which has one or more
executive officers serving as a member of the Company's Board of Directors or
Compensation Committee.
 
DIRECTOR COMPENSATION
 
    No nonemployee director of the Company received any cash compensation for
service on the Board of Directors or any committee thereof during the fiscal
year ended September 28, 1997.
 
                                       3
<PAGE>
    Under the Company's 1992 Stock Option Plan for Nonemployee Directors (the
"Nonemployee Directors Plan"), an option to purchase 3,051 shares of Common
Stock is granted to each nonemployee director of the Company automatically each
year, immediately following the annual meeting of stockholders of the Company.
Such option vests and becomes exercisable in full on the first anniversary of
its grant date, provided that the optionee is reelected as a director of the
Company. The exercise price of stock options granted under the Nonemployee
Directors Plan is equal to the fair market value of the Common Stock on the date
of grant. During the fiscal year ended September 28, 1997, each director elected
at the 1997 Annual Meeting of Stockholders received an option to purchase 3,051
shares of Common Stock at an exercise price of $13.36 per share.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    No interlocking relationship exists between the Company's Board of Directors
and the compensation committee of any other company.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
    The Company's Certificate of Incorporation limits the liability of directors
to the maximum extent permitted by Delaware law. Delaware law provides that
directors of a company will not be personally liable for monetary damages for
breach of their fiduciary duties as directors, except for liability (i) for any
breach of their duty of loyalty to the company or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) for unlawful payments of dividends or unlawful
stock repurchases or redemptions as provided in Section 174 of the Delaware
General Corporation Law, or (iv) for any transaction from which the director
derived an improper personal benefit.
 
    The Company's Bylaws provide that the Company shall indemnify its officers
and directors and may indemnify its employees and other agents to the fullest
extent permitted by law. The Company's Bylaws also permit it to secure insurance
on behalf of any officer, director, employee or other agent for any liability
arising out of his or her actions in such capacity, regardless of whether Bylaws
would permit indemnification.
 
    The Company maintains director and officer liability insurance.
 
    At present, there is no pending litigation or proceeding involving any
director, officer, employee or agent of the Company, where indemnification will
be required or permitted. The Company is not aware of any threatened litigation
or proceeding which may result in a claim for such indemnification.
 
                                       4
<PAGE>
                 SECURITY OWNERSHIP OF PRINCIPAL STOCKHOLDERS,
                        DIRECTORS AND EXECUTIVE OFFICERS
 
    The following table sets forth information regarding the ownership of the
Company's Common Stock as of December 1, 1997 (as adjusted to reflect the
Company's 5-for-4 stock split, effected in the form of a 25% stock dividend, in
December 1997) by (i) all those persons known by the Company to own beneficially
more than 5% of the Company's Common Stock, (ii) each director, nominee for
director and certain executive officers of the Company and (iii) all officers
and directors as a group. Except as otherwise noted, the Company knows of no
agreements among its stockholders which relate to voting or investment power
over its Common Stock.
 
<TABLE>
<CAPTION>
                                                                  NUMBER OF    PERCENTAGE OF
                                                                   SHARES         SHARES
                                                                 BENEFICIALLY  BENEFICIALLY
                 NAME OF BENEFICIAL OWNER (1)                       OWNED        OWNED (1)
- ---------------------------------------------------------------  -----------  ---------------
<S>                                                              <C>          <C>
Li-San Hwang (2)...............................................   1,405,153            6.3%
  Tetra Tech, Inc.
  670 N. Rosemead Blvd.
  Pasadena, California 91107
 
Daniel A. Whalen (3)...........................................   3,639,795           16.3
  Whalen & Company, Inc.
  3675 Mt. Diablo Blvd.
  Suite 360
  Lafayette, California 94549
 
Pilgrim Baxter & Associates, Ltd. (4)..........................   1,813,580            8.1
  Harold J. Baxter
  Gary I. Pilgrim
  1255 Drummers Lane
  Wayne, Pennsylvania 19087
 
The Northwestern Mutual Life
  Insurance Company (5)........................................   1,168,125            5.2
  720 E. Wisconsin Avenue
  Milwaukee, Wisconsin 53202
 
RCM Capital Management, L.L.C. (6)
RCM Limited L.P.
RCM General Corporation........................................   1,717,875            7.7
  Four Embarcadero Center, Suite 2900
  San Francisco, California 94111
 
Dresdner Bank AG (7)...........................................   1,717,875            7.7
  Jurgen-Ponto-Platz 1
  60301 Frankfurt, Germany
 
J. Christopher Lewis (8).......................................      60,075              *
 
Patrick C. Haden (9)...........................................      16,413              *
 
James J. Shelton (10)..........................................       9,032              *
 
Thomas D. Brisbin (11).........................................      20,290              *
 
Charles R. Faust (12)..........................................      49,808              *
 
James M. Jaska (13)............................................      39,207              *
 
All directors and officers as a group (12 persons) (14)........   5,591,364           25.1%
</TABLE>
 
- ------------------------
 
*   Amount represents less than 1% of the Company's Common Stock.
 
                                       5
<PAGE>
(1) Unless otherwise indicated, the persons named in the table have sole voting
    and sole investment power with respect to all shares of Common Stock shown
    as beneficially owned by them, subject to community property rules where
    applicable and the information contained in this table and these notes.
 
(2) Excludes an aggregate of 20,519 shares of Common Stock owned by Dr. Hwang's
    adult children as to which Dr. Hwang disclaims beneficial ownership.
    Includes 12,792 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997.
 
(3) Includes (i) 3,639,800 shares of Common Stock held by Daniel A. Whalen and
    Katherine C. Whalen as Trustees for the Whalen Family Trust U/A/D 4/30/92,
    (ii) 22,748 shares of Common Stock held by Daniel A. Whalen and Katharine C.
    Whalen as Trustees for the MJW Whalen Trust 1997 - D, (iii) 22,748 shares of
    Common Stock held by Daniel A. Whalen and Katharine C. Whalen as Trustees
    for the ACW Whalen Trust 1997 - D, (iv) 22,748 shares of Common Stock held
    by Daniel A. Whalen and Katharine C. Whalen as Trustees for the MCW Whalen
    Trust 1997 - D, (v) 22,748 shares of Common Stock held by Daniel A. Whalen
    and Katharine C. Whalen as Trustees for the MJW Whalen Trust 1997 - K, (vi)
    22,748 shares of Common Stock held by Daniel A. Whalen and Katharine C.
    Whalen as Trustees for the ACW Whalen Trust 1997 - K, and (vii) 22,748
    shares of Common Stock held by Daniel A. Whalen and Katharine C. Whalen as
    Trustees for the MCW Whalen Trust 1997 - K.
 
(4) All information regarding share ownership is taken from and furnished in
    reliance upon the Schedule 13G (Amendment No. 4), dates as of June 20, 1997,
    jointly filed by Pilgrim Baxter & Associates, Ltd., Harold J. Baxter and
    Gary I. Pilgrim.
 
(5) All information regarding share ownership is taken from and furnished in
    reliance upon the Schedule 13G (Amendment No. 1), dated February 7, 1997,
    filed by The Northwestern Mutual Life Insurance Company.
 
(6) All information regarding share ownership is taken from and furnished in
    reliance upon the Schedule 13G, dated February 3, 1997, jointly filed by RCM
    Capital Management, L.L.C., RCM Limited L.P. and RCM General Corporation.
 
(7) All information regarding share ownership is taken from and furnished in
    reliance upon the Schedule 13G, dated February 7, 1997, filed by Dresdner
    Bank AG. RCM Capital Management, L.L.C. is a wholly-owned subsidiary of
    Dresdner Bank AG.
 
(8) Includes 9,153 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997.
 
(9) Excludes an aggregate of 2,148 shares of Common Stock owned by Mr. Haden's
    wife as to which Mr. Haden disclaims beneficial ownership. Includes 9,153
    shares issuable with respect to stock options exercisable within 60 days
    after December 1, 1997.
 
(10) Includes 2,930 shares held by James J. Shelton, Sarah Belle Shelton and
    James J. Shelton, Jr., Trustees of the James J. Shelton and Sarah Belle
    Shelton Family Trust dated August 19, 1987, and 6,102 shares issuable with
    respect to stock options exercisable within 60 days after December 1, 1997.
 
(11) Includes 19,922 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997.
 
(12) Includes 12,839 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997. Additionally, Dr. Faust's minor
    children own an aggregate of 1,758 shares of Common Stock as to which Dr.
    Faust disclaims beneficial ownership.
 
(13) Includes 38,808 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997.
 
(14) Includes 179,287 shares issuable with respect to stock options exercisable
    within 60 days after December 1, 1997.
 
                                       6
<PAGE>
                        EXECUTIVE OFFICERS, COMPENSATION
                             AND OTHER INFORMATION
 
EXECUTIVE OFFICERS
 
    The following table sets forth certain information concerning each person
who is an executive officer of the Company:
 
<TABLE>
<CAPTION>
      NAME                               AGE                                POSITION
                                     -----------  ------------------------------------------------------------
<S>                                  <C>          <C>
Li-San Hwang.......................          62   Chairman of the Board of Directors, President and
                                                   Chief Executive Officer
Thomas D. Brisbin..................          45   Executive Vice President, Chief Operating Officer
James M. Jaska.....................          46   Vice President, Chief Financial Officer and Treasurer
Daniel A. Whalen...................          50   Director, Executive Vice President of
                                                   Telecommunications Services
William R. Brownlie................          44   Senior Vice President
Steven A. Gherini..................          52   Vice President
Arkan Say..........................          62   Vice President
Charles R. Faust...................          52   Vice President
Richard A. Lemmon..................          38   Vice President and Secretary
</TABLE>
 
    Executive officers of the Company are elected by and serve at the discretion
of the Board of Directors. Set forth below is a brief description of the
business experience of all executive officers other than Li-San Hwang and Daniel
A. Whalen. For information concerning the business experience of Dr. Hwang and
Mr. Whalen, who are also directors of the Company, see "Proposal No. 1--Election
of Directors-- Nominees."
 
    Dr. Brisbin was named Executive Vice President and Chief Operating Officer
of the Company in 1996. He joined Planning Research Corporation ("PRC"), a
wholly-owned subsidiary of The Black & Decker Corporation, in 1978 and was
co-founder and President of PRC Environmental Management, Inc. ("PRC EMI").
During his 17 year tenure at PRC, he was involved in all aspects of marketing,
operations and finance. Before joining PRC, he was a research associate at
Argonne National Laboratory and an adjunct professor at the Illinois Institute
of Technology. Dr. Brisbin holds a B.S. degree from Northern Illinois University
and a Ph.D. in Environmental Engineering from Illinois Institute of Technology.
He also completed Harvard Business School's Advanced Management Program in 1988.
 
    Mr. Jaska joined the Company in 1994 as Vice President, Chief Financial
Officer and Treasurer. From 1991 to 1994, Mr. Jaska held several operations and
management positions at Alliant Techsystems, Inc., in addition to leading the
environmental business venture and having operational responsibility for large
government defense plants. From 1988 to 1990, he served as the Director of
Finance and Business Management at Honeywell Inc.'s Precision Weapons
Operations. From 1981 to 1987, he was responsible for environmental affairs at
Honeywell Inc. From 1977 to 1981, he managed regulatory affairs dealing with the
production of specialty chemicals at Ecolab, Inc. Mr. Jaska also served as an
advisor to numerous governmental and professional committees. Mr. Jaska holds
B.S. and M.S. degrees from Western Illinois University and completed an
executive management program through Harvard University.
 
    Dr. Brownlie joined the Company in 1981, has been a Vice President since
1988 and was named a Senior Vice President in December 1993. He has managed
several large government environmental support programs and serves as head of
one of the Company's largest operating units. Dr. Brownlie is a registered Civil
Engineer with a technical background in hydrology, hydraulics, water quality
analysis and numerical modeling. Dr. Brownlie holds B.S. and M.S. degrees in
Civil Engineering at the State University
 
                                       7
<PAGE>
of New York at Buffalo, and earned a Ph.D. in Civil Engineering from the
California Institute of Technology.
 
    Mr. Gherini joined the Company in 1976. Mr. Gherini has served as Program
Manager on a variety of contracts involving chemistry, water quality control and
water quality modeling, and served as Division Vice President prior to being
named to his present position in 1988. He is the author of numerous technical
publications and is the developer of several models for pollutant fate and
transport. He has served on two National Academy of Science panels. Mr. Gherini
is a registered engineer with B.S. and M.S. degrees in Civil Engineering from
Stanford University, and a M.S. degree in Aquatic Chemistry from Harvard
University.
 
    Mr. Say joined Edward H. Richardson & Associates (a firm that was acquired
by the Company's predecessor in 1981 and became a division of the Company in
1991) in 1958 and was named to his present position in 1988. He has authored
several publications on site development, engineering and storm drainage. Mr.
Say holds a B.S. in Civil Engineering from Robert College in Istanbul, Turkey
and a M.S. in Civil Engineering from the University of Delaware.
 
    Dr. Faust, Vice President of the Company since 1988 and Executive Vice
President of HSI GeoTrans, Inc. ("HSG"), a subsidiary of the Company, co-founded
GeoTrans, Inc., a predessesor of HSG, in 1979. In addition to his management
responsibilities, he is engaged in the quantitative assessment and investigation
of highly technical groundwater problems. He has published 23 articles and has
co-authored a book on groundwater modeling. Dr. Faust holds B.S. and Ph.D.
degrees in Geology from Pennsylvania State University.
 
    Mr. Lemmon, Vice President and Secretary, joined the Company in 1981. Until
1985, he served in several technical capacities. He transferred to Corporate
Human Resources, and was promoted to Corporate Manager of Human Resources in
1987. Following the Company's divestiture from Honeywell, Inc., Mr. Lemmon
structured and managed the Company's Risk Management, Human Resource and Office
Leasing programs. In 1990, he was promoted to Director of Administration and in
1994 assumed responsibility for contracts administration and was elected as the
Company's Secretary. In November 1995, Mr. Lemmon was elected a Vice President.
Mr. Lemmon holds a B.A. degree in Business Administration.
 
                                       8
<PAGE>
EXECUTIVE COMPENSATION
 
    The following table sets forth the cash compensation paid or accrued by the
Company to the Chief Executive Officer and to each of the four additional most
highly compensated executive officers for each of the fiscal years in the
three-year period ended September 28, 1997:
 
                           SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>
                                                                                             LONG-TERM COMPENSATION
                                                                                  ---------------------------------------------
                                                                                              AWARDS
                                                                                  ------------------------------
                                              ANNUAL COMPENSATION                                   SECURITIES       PAYOUTS
                                ------------------------------------------------    RESTRICTED      UNDERLYING    -------------
                                                                  OTHER ANNUAL         STOCK         OPTIONS/         LTIP
                                            SALARY      BONUS     COMPENSATION       AWARD(S)          SARS          PAYOUTS
NAME AND PRINCIPAL POSITION       YEAR        ($)        ($)         ($) (1)            ($)             ($)            ($)
- ------------------------------  ---------  ---------  ---------  ---------------  ---------------  -------------  -------------
 
<S>                             <C>        <C>        <C>        <C>              <C>              <C>            <C>
Li-San Hwang                         1997    185,016     80,000         1,087(2)             0           6,250              0
  Chairman, Chief Executive          1996    185,016     80,000         1,975                0           7,813              0
  Officer and President              1995    185,016     80,000         4,203                0           9,766              0
 
Thomas D. Brisbin                    1997    155,483     50,000             0                0               0              0
  Executive Vice President,          1996    148,593          0             0                0          67,188              0
  Chief Operating Officer            1995      2,914     50,000             0                0               0              0
 
James M. Jaska                       1997    109,301     50,000         5,400(5)             0          15,000              0
  Vice President,                    1996    104,344     27,000         5,400                0           3,125              0
  Chief Financial Officer            1995    100,006     27,000         5,478                0               0              0
  and Treasurer
 
William R. Brownlie                  1997    113,491     30,000         5,400(7)             0           2,500              0
  Senior Vice President              1996    108,933     25,000         5,400                0           3,906              0
                                     1995    101,331     30,000         5,479                0           9,766              0
 
Charles R. Faust                     1997    118,606          0         5,400(9)             0           4,375              0
  Vice President                     1996    115,000     15,000         5,400                0           2,344              0
                                     1995    112,000     27,000         5,400                0           5,860              0
 
<CAPTION>
 
                                   ALL OTHER
                                 COMPENSATION
NAME AND PRINCIPAL POSITION           ($)
- ------------------------------  ---------------
<S>                             <C>
Li-San Hwang                          10,317(3)
  Chairman, Chief Executive           10,746
  Officer and President               11,665
Thomas D. Brisbin                     34,058(4)
  Executive Vice President,            9,337
  Chief Operating Officer                 66
James M. Jaska                         5,826(6)
  Vice President,                      6,378
  Chief Financial Officer              6,250
  and Treasurer
William R. Brownlie                    6,043(8)
  Senior Vice President                6,668
                                       6,063
Charles R. Faust                       8,637(10)
  Vice President                       8,758
                                       8,291
</TABLE>
 
(1) No named executive officer other than Mr. Brisbin received other annual
    compensation in excess of the lesser of $50,000 or 10% of such officer's
    compensation in fiscal 1997.
 
(2) Comprised of $1,087 in automobile lease payments.
 
(3) Comprised of $7,850 of Company contributions to its Retirement Plan and
    $2,467 benefits and premiums paid by the Company to Dr. Hwang pursuant to
    the Executive Medical Reimbursement Plan.
 
(4) Comprised of $6,398 of Company contributions to its Retirement Plan and
    $27,660 in taxable relocation benefits.
 
(5) Comprised of $5,400 automobile allowances.
 
(6) Comprised of $5,826 of Company contributions to its Retirement Plan.
 
(7) Comprised of $5,400 automobile allowances.
 
(8) Comprised of $6,043 of Company contributions to its Retirement Plan.
 
(9) Comprised of $5,400 automobile allowances.
 
(10) Comprised of $6,387 of Company contributions to its Retirement Plan and
    $2,250 of life insurance premiums paid on behalf of Dr. Faust.
 
                                       9
<PAGE>
    The following table sets forth information concerning options granted to
each of the named executive officers during fiscal 1997:
 
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                                             POTENTIAL
                                                                                                          REALIZABLE VALUE
                                                                                                             AT ASSUMED
                                                               INDIVIDUAL GRANTS                          ANNUAL RATES OF
                                          ------------------------------------------------------------      STOCK PRICE
                                             NUMBER OF        % OF TOTAL                                  APPRECIATION FOR
                                            SECURITIES       OPTIONS/SARS      EXERCISE                     OPTION TERM
                                            UNDERLYING        GRANTED TO        OR BASE                 --------------------
                                           OPTIONS/SARS      EMPLOYEES IN        PRICE     EXPIRATION      5%         10%
      NAME                                 GRANTED(#)(1)      FISCAL YEAR       ($/SH)        DATE       ($)(2)     ($)(2)
                                          ---------------  -----------------  -----------  -----------  ---------  ---------
<S>                                       <C>              <C>                <C>          <C>          <C>        <C>
Li-San Hwang............................         6,250              1.02           15.20     12/12/06      59,745    151,406
James M. Jaska..........................         2,500              0.41           15.20     12/12/06      23,898     60,532
James M. Jaska..........................        12,500              2.05           12.90     05/14/07     101,409    256,991
Daniel A. Whalen........................        12,500              2.05           17.60     06/11/07     138,357    350,623
William R. Brownlie.....................         2,500              0.41           15.20     12/12/06      23,898     60,562
Charles R. Faust........................         4,375              0.72           15.20     12/12/06      41,821    105,984
</TABLE>
 
- --------------------------
 
(1) All options are incentive stock options and were granted under the Company's
    1992 Incentive Stock Plan. Such options vest over four year periods at an
    annual rate of 25% beginning on the first anniversary of the date of grant.
 
(2) Potential realizable value is determined by multiplying the exercise or base
    price per share by the stated annual appreciation rate compounded annually
    for the term of the option (10 years), subtracting the exercise or base
    price per share from the product, and multiplying the remainder by the
    number of options granted. Actual gains, if any, on stock option exercises
    and Common Stock holdings are dependent on the future performance of the
    Common Stock and overall stock market conditions. There can be no assurance
    that the amounts reflected in this table will be achieved.
 
    The following table sets forth information concerning the aggregate number
of options exercised during fiscal 1997 by each of the named executive officers:
 
                  OPTION/SAR EXERCISES IN LAST FISCAL YEAR AND
                       FISCAL YEAR END OPTION/SAR VALUES
 
<TABLE>
<CAPTION>
                                                                                                                 VALUE OF
                                                                                             NUMBER OF         UNEXERCISED
                                                                                            UNEXERCISED        IN-THE-MONEY
                                                                                            OPTIONS/SARS       OPTIONS/SARS
                                                                                             AT FY-END          AT FY-END
                                                         SHARES                           ----------------  ------------------
                                                       ACQUIRED ON           VALUE          EXERCISABLE/       EXERCISABLE/
      NAME                                             EXERCISE(#)        REALIZED($)     UNEXERCISABLE(#)  UNEXERCISABLE($)(1)
                                                    -----------------  -----------------  ----------------  ------------------
<S>                                                 <C>                <C>                <C>               <C>
Li-San Hwang......................................          0                  0           12,792/23,829      63,158/173,054
Thomas D. Brisbin.................................          0                  0           19,922/67,188     113,950/384,313
James M. Jaska....................................          0                  0           38,808/66,954     372,443/603,928
Daniel A. Whalen..................................          0                  0              0/12,500           0/27,500
William R. Brownlie...............................          0                  0           28,517/34,788     274,811/389,520
Charles R. Faust..................................          0                  0           12,839/28,754      90,228/313,970
</TABLE>
 
- --------------------------
 
(1) Value is determined by subtracting the exercise price from the fair market
    value of $24.75 per share (the closing price for the Company's Common Stock
    as reported by the Nasdaq Stock Market as of September 26, 1997) and
    multiplying the remainder by the number of underlying shares of Common
    Stock.
 
                                       10
<PAGE>
BONUS PROGRAMS
 
    The Board of Directors awards, at its discretion, annual bonuses to its
executive officers based upon recommendations made by the Compensation Committee
(as to Dr. Hwang) and Dr. Hwang (as to the other executive officers) concerning
individual performance and the Company's achievement of certain operating
results. The Company maintains a separate bonus program for other key employees.
Under that program, the Company is divided into 11 operating units. If the
operating profit for any operating unit determined on an annual basis following
the conclusion of the fiscal year exceeds the targeted percentage for that year,
then a bonus equal to 25% of the amount in excess of the target is allocated to
that profit center and the group manager divides it among group members in his
or her discretion based upon individual performance.
 
1992 INCENTIVE STOCK PLAN
 
    The Company's 1992 Incentive Stock Plan (the "Plan") was adopted by the
Company's Board of Directors on December 1, 1992 and was subsequently approved
by the Company's stockholders. The Plan provides for the granting of incentive
stock options, nonqualified stock options and rights to purchase restricted
stock to key employees and officers of the Company or any of its subsidiaries,
including directors who are also key employees or officers of the Company and
its subsidiaries. The maximum number of shares of Common Stock authorized for
issuance under the Plan is 3,687,500.
 
EMPLOYEE STOCK PURCHASE PLAN
 
    The Company's Employee Stock Purchase Plan (the "Purchase Plan") was adopted
by the Company's Board of Directors on November 15, 1995 and was subsequently
approved by the Company's stockholders. The Purchase Plan provides for the
granting of Purchase Rights to purchase Common Stock to regular full-time and
regular part-time employees and officers of the Company or any of its
subsidiaries, including directors who are also employees or officers of the
Company or any of its subsidiaries. Under the Purchase Plan, 702,500 shares may
be issued upon the exercise of Purchase Rights.
 
    Each Purchase Right lasts for a period of 52 weeks (a "Purchase Right
Period"). Prior to the beginning of each Purchase Right Period, employees may
elect to contribute fixed amounts to the Purchase Plan during that Purchase
Right Period to purchase Common Stock. The maximum amount that an employee can
contribute during a Purchase Right period is $4,000, and the minimum
contribution per payroll period is $25.
 
    Under the Purchase Plan, the exercise price of a Purchase Right will be the
lesser of 100% of the fair market value of such shares (based upon its closing
price on the Nasdaq Stock Market) on the first day of the Purchase Right Period
or 85% of the fair market value on the last day of such Period. Employees'
contributions to the Purchase Plan are automatically used to purchase Common
Stock on the last day of the Purchase Right Period unless an employee elects to
withdraw from the Purchase Plan or is terminated prior to that date. If the
Company is sold, all Purchase Rights will become exercisable immediately
preceding the sale. Employees who elect to suspend their contributions can elect
either to withdraw their contributions or leave those amounts in the Purchase
Plan to be used to purchase Common Stock at the end of the Purchase Right
Period.
 
RETIREMENT PLANS
 
    THE COMPANY RETIREMENT PLAN. The Company maintains a combined discretionary
profit-sharing contribution and 401(k) retirement plan (the "Retirement Plan")
covering all employees of the Company and its subsidiaries and related
participating employers. The Retirement Plan is qualified under Section 401(a)
of the Internal Revenue Code of 1986, as amended (the "Code"), and the 401(k)
portion of the Retirement Plan is intended to qualify under Section 401(k) of
the Code.
 
                                       11
<PAGE>
    Under the terms of the Retirement Plan, each eligible employee may elect to
defer up to 15% of base compensation or the maximum 401(k) contribution allowed
under Federal law and to have such deferred amount contributed to the Retirement
Plan on his or her behalf. The Company makes a matching contribution to each
employee who elects to participate in the 401(k) portion of the Retirement Plan.
In addition, the Board of Directors may elect to have the Company make a profit
sharing contribution that will be allocated among the eligible participants in
the ratio that each participant's gross base compensation bears to the total
gross base compensation of all eligible employees. Company matching and profit
sharing contributions fully vest upon the earlier of the employee's retirement,
death, disability, or fifth year of service. Benefits under the Retirement Plan
are generally distributed in the form of a lump sum following a participant's
retirement, death, disability or termination of employment. Benefits may be
distributed prior to termination of employment under certain circumstances
including hardship. The Company pays all costs associated with the
administration of the Retirement Plan.
 
    Effective January 1, 1998, Whalen & Company, Inc. will participate in the
Retirement Plan. Prior to this time, Whalen & Company, Inc. participated in a
separate retirement plan covering its employees. SCM Consultants, Inc. and
CommSite Development Corporation participate in separate retirement plans
covering their respective employees.
 
EXECUTIVE MEDICAL REIMBURSEMENT PLAN
 
    The Executive Medical Reimbursement Plan (the "Medical Plan"), which was
established by the Company's predecessor in 1975 for the benefit of the
Company's executive officers, reimburses participants, their spouses and covered
children for medical expenses not covered by the Company's regular group medical
plan. In effect, this Medical Plan provides participants with 100% medical
coverage for all allowable medical expenses. During the fiscal year ending
September 28, 1997, premiums totaling $420 were paid by the Company in
connection with the Medical Plan. At the present time, Messrs. Hwang and Gherini
are the only executive officers covered by the Medical Plan and the Company does
not intend to offer the Medical Plan to any additional executive officers in the
future.
 
CERTAIN TRANSACTIONS
 
    Patrick C. Haden, a director and stockholder of the Company, is of counsel
to the law firm of Riordan & McKinzie, Los Angeles, California. Riordan &
McKinzie acts as general counsel to the Company. Certain principals and
employees of Riordan & McKinzie beneficially own shares of the Company's Common
Stock.
 
                                       12
<PAGE>
                      REPORT OF THE COMPENSATION COMMITTEE
                           OF THE BOARD OF DIRECTORS
 
    The Compensation Committee (the "Committee") of the Board of Directors
oversees the general compensation policies of the Company, oversees the
compensation plans, establishes the specific compensation of Dr. Hwang, the
Company's Chief Executive Officer, reviews the Chief Executive Officer's
recommendations as to the specific compensation levels for the other executive
officers and oversees the Company's stock incentive plans. The Compensation
Committee is composed of two independent non-employee directors who have no
interlocking relationships as defined by the Securities and Exchange Commission.
 
    COMPENSATION POLICY AND PROGRAMS. The Committee's responsibility is to
provide a strong and direct link among stockholder values, Company performance
and executive compensation through its oversight of the design and
implementation of a sound compensation program that will attract and retain
highly qualified personnel. Compensation programs are intended to complement the
Company's short-and long-term business objectives and to focus executive efforts
on the fulfillment of these objectives.
 
    Each year the Committee has conducted a full review of the Company's
executive compensation program. It has been the Committee's practice to meet
with Dr. Hwang to discuss salary levels and option plans to incent and retain
senior officers. The Committee reviews the suggested compensation levels of
salary, bonus, and stock options proposed by Dr. Hwang. In its review of the
proposed compensation levels, the Committee reviews compensation levels of
senior managers of companies which are direct business competitors of the
Company. A significant portion of executive compensation is directly related to
the Company's financial performance and is therefore at risk. Total compensation
for the Company's senior management is composed of base salary, near-term
incentive compensation in the form of bonuses and long-term incentive
compensation in the form of stock options.
 
    BASE SALARY. In establishing base salary levels for senior officer
positions, the Committee and Dr. Hwang consider levels of compensation at
similarly situated companies and at direct competitors, levels of responsibility
and internal issues of consistency and fairness. In determining the base salary
of a particular executive, the Committee and Dr. Hwang consider individual
performance, including the accomplishment of short- and long-term objectives,
and various subjective criteria including initiative, contribution to overall
corporate performance and leadership ability.
 
    In fiscal 1997, the annual base salary of Dr. Hwang was determined by the
Committee based on comparable chief executive salaries of a peer group of
companies and of direct competitors referred to above, the Company's overall
performance and profitability in fiscal 1997, Dr. Hwang's efforts and
contributions to the Company and Dr. Hwang's ownership interest in the Company.
 
    BONUSES. The Company's executive officers are eligible for annual bonuses
based upon recommendations made by Dr. Hwang (as to the other executive
officers) and the Compensation Committee (as to Dr. Hwang) based upon their
individual performance and the Company's achievement of certain operating
results.
 
    Amounts of individual awards are based principally upon the results of the
Company's financial performance during the prior fiscal year. The amount of
awards for senior officers are within guidelines established by the Committee
and Dr. Hwang as a result of their review of total compensation for senior
management of peer companies and competitors. The actual amount awarded, within
these guidelines, will be determined principally by the Committee's and Dr.
Hwang's assessment of the individual's contribution to the Company's overall
financial performance. Consideration is also given to factors such as the
individual's successful completion of a special project, any significant
increase or decrease in the level of the participant's executive responsibility
and the Committee's and Dr. Hwang's evaluation of the individual's overall
efforts and ability to discharge the responsibilities of his or her position. In
fiscal 1998,
 
                                       13
<PAGE>
bonuses related to performance in fiscal 1997 to be paid to the five named
executive officers range from $0 to $85,000, and range from 0% to 46% of such
officers' base salaries.
 
    Dr. Hwang's bonus with respect to the 1997 fiscal year was $85,000. In
determining the amount of the 1997 award, the Committee gave particular
consideration to the following factors: (1) the Company's favorable return on
average equity during the 1997 fiscal year in a difficult economic climate; (2)
the positive earnings growth of the Company during the fiscal year; and (3) the
efforts and significant contributions made by Dr. Hwang in discharging his
responsibilities as Chief Executive Officer. The Committee also determined that
the discretionary bonus should constitute a larger percentage of Dr. Hwang's
total annual compensation.
 
    STOCK OPTIONS. In fiscal 1992, the Committee adopted the Company's 1992
Incentive Stock Plan (the "1992 Plan"). The purpose of the 1992 Plan is to
provide incentives and reward the contributions of key employees and officers
for the achievement of long-term Company performance, as measured by earnings
per share and the market value of the Common Stock. The Committee and Dr. Hwang
set guidelines for the number and terms of stock option or restricted stock
awards based on factors similar to those considered with respect to the other
components of the Company's compensation program, including comparison with the
practices of peer group companies and direct competitors. In the event of
unsatisfactory corporate performance, the Committee may decide not to award
stock options or restricted stock in any given fiscal year although exceptions
to this policy may be made for individuals who have assumed substantially
greater responsibilities and other similar factors. The awards under the 1992
Plan are designed to align the interests of executives with those of the
stockholders. Generally, stock options become exercisable in cumulative
installments over a period of four years, but the individual forfeits any
installment which has not vested during the period of his or her employment.
 
    Under the 1992 Plan, the Compensation Committee awarded stock options in
fiscal 1997 to all named executive officers with the exception of Thomas D.
Brisbin.
 
    INTERNAL REVENUE CODE SECTION 162(M). Under Section 162 of the Internal
Revenue Code of 1986, as amended, the amount of compensation paid to certain
executives that is deductible with respect to the Company's corporate taxes is
limited to $1,000,000 annually. It is the current policy of the Compensation
Committee to maximize, to the extent reasonably possible, the Company's ability
to obtain a corporate tax deduction for compensation paid to executive officers
of the Company to the extent consistent with the best interests of the Company
and its stockholders.
 
                                      COMPENSATION COMMITTEE
                                      J. Christopher Lewis
                                      Patrick C. Haden
 
                                       14
<PAGE>
                              COMPANY PERFORMANCE
 
    The following graph shows a comparison of cumulative total returns for the
Company, the Nasdaq Stock Market (U.S. Companies) Index and a
Company-constructed Peer Group Index (as defined below). The graph assumes that
the value of an investment in Common Stock and in each such index was $100 on
September 25, 1992, and that all dividends have been reinvested. The
Company-constructed Peer Group Index includes the following companies: 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. The Company believes that the companies included in the Peer
Group Index are among the primary competitors of the Company.
 
    The comparison in the graph below is based on historical data and is not
intended to forecast the possible future performance of the Company's Common
Stock.
 
                  COMPARISON OF CUMULATIVE TOTAL RETURN AMONG
               TETRA TECH, NASDAQ STOCK MARKET (U.S. COMPANIES),
                  AND TETRA TECH'S SELF-CONSTRUCTED PEER GROUP
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                TETRA TECH    NASDAQ STOCK MARKET   PEER INDEX
<S>             <C>          <C>                    <C>
Sept. 25, 1992       $100.0                 $100.0       $100.0
Dec. 24, 1992        $108.5                 $115.7       $109.4
Mar. 26, 1993        $128.7                 $118.1       $109.7
June 25, 1993        $121.3                 $120.5       $100.8
Sept. 29, 1993       $139.7                 $132.4        $98.2
Dec. 23, 1993        $165.4                 $131.6        $95.2
Mar. 25, 1994        $183.8                 $136.3        $99.5
June 24, 1994        $172.3                 $121.0        $78.5
Sept. 30, 1994       $219.7                 $133.4        $80.9
Dec. 23, 1994        $199.6                 $130.2        $71.3
Mar. 24, 1995        $218.3                 $144.1        $69.7
June 26, 1995        $258.5                 $163.4        $71.9
Sept. 29, 1995       $333.9                 $184.3        $82.8
Dec. 26, 1995        $341.1                 $186.1        $69.0
Mar. 26, 1996        $315.9                 $192.7        $62.1
June 26, 1996        $345.6                 $205.4        $65.7
Sept. 27, 1996       $426.3                 $219.4        $64.2
Dec. 26, 1996        $350.1                 $230.4        $66.6
Mar. 26, 1997        $278.2                 $225.3        $62.6
June 26, 1997        $406.2                 $255.5        $64.5
Sept. 26, 1997       $444.3                 $299.6        $76.5
</TABLE>
 
                                       15
<PAGE>
      COMPLIANCE WITH SECTION 16(A) OF THE SECURITIES EXCHANGE ACT OF 1934
 
    Section 16(a) of the Securities Exchange Act of 1934 ("Section 16") requires
the Company's executive officers, directors and beneficial owners of more than
10% of the Company's Common Stock (collectively, "Insiders") to file reports of
ownership and changes in ownership of Common Stock of the Company with the
Securities and Exchange Commission and the Nasdaq Stock Market, and to furnish
the Company with copies of all Section 16(a) forms they file.
 
    Based solely on its review of the copies of such forms received by it, or
written representations from certain reporting persons that no Form 5s were
required for those persons, the Company believes that its Insiders complied with
all applicable Section 16 filing requirements for fiscal 1997, with the
exception of Mr. Lewis who filed a late Form 4 in January 1998 to report his
gift of certain shares of Common Stock.
 
                         INDEPENDENT PUBLIC ACCOUNTANTS
 
    Deloitte & Touche LLP, certified public accountants, acted as Company's
independent auditors and audited the consolidated financial statements of the
Company for the fiscal year ended September 28, 1997. The Company has been
advised that Deloitte & Touche LLP is independent with respect to the Company
within the meaning of the Securities Act of 1993, as amended, and the applicable
published rules and regulations thereunder. A representative of that firm is
expected to be present at the Meeting and the representative is expected to be
available to respond to appropriate questions. The Board of Directors has
recommended that Deloitte & Touche LLP be appointed as the Company's auditors
for fiscal 1998.
 
                 STOCKHOLDER PROPOSALS FOR 1999 ANNUAL MEETING
 
    Any stockholder who wishes to present a proposal for action at the 1999
Annual Meeting of Stockholders and who wishes to have it set forth in the
corresponding proxy statement and identified in the corresponding form of proxy
prepared by management must notify the Company no later than September 1, 1998
in such form as required under the rules and regulations promulgated by the
Securities and Exchange Commission.
 
                                 OTHER MATTERS
 
    The Board of Directors does not know of any other matters to be presented at
the Meeting, but, if other matters do properly come before the Meeting, it is
intended that the persons named as proxies in the proxy will vote on them in
accordance with their best judgment.
 
    A copy of the Company's 1997 Annual Report for the fiscal year ended
September 28, 1997 is being mailed to each stockholder of record together with
this Proxy Statement.
 
    The Company has filed with the Securities and Exchange Commission its Annual
Report on Form 10-K for the fiscal year ended September 28, 1997. This Report
contains detailed information concerning the Company and its operations,
supplementary financial information and certain schedules which are not included
in the 1997 Annual Report. A COPY OF THIS REPORT WILL BE FURNISHED TO
STOCKHOLDERS WITHOUT CHARGE UPON REQUEST IN WRITING TO: Richard A. Lemmon,
Secretary, Tetra Tech, Inc., 670 North Rosemead Boulevard, Pasadena, California
91107; telephone number (626) 351-4664. The Annual Report and Form 10-K are not
part of the Company's soliciting material.
 
                                      By Order of the Board of Directors
 
                                      /s/ Richard A. Lemmon
 
                                      Richard A. Lemmon
                                      Vice President and Secretary
 
Pasadena, California
January 12, 1998
 
                                       16
<PAGE>
COMMON STOCK
PROXY                           TETRA TECH, INC.
BOARD OF DIRECTORS
 
    The undersigned hereby appoints Li-San Hwang and Richard A. Lemmon, or
either of them, the true and lawful attorneys and proxies of the undersigned,
with full power of substitution, to vote all shares of the Common Stock, $.01
par value ("Common Stock"), of TETRA TECH, INC. which the undersigned is
entitled to vote, at the Annual Meeting of the Stockholders of TETRA TECH, INC.
to be held at The Pasadena Hilton, 150 S. Los Robles Avenue, Pasadena,
California 91101 on Wednesday, February 11, 1998 at 10:00 a.m., Los Angeles
Time, and at any and all adjournments thereof, on the proposals set forth below
and any other matters properly brought before the Meeting.
 
1.  ELECTION OF DIRECTORS            FOR all nominees       WITHHOLD AUTHORITY
                                  / / listed below       / / to
                                     (except as marked to   vote for all
                                     the contrary below)    nominees
 
(INSTRUCTION: TO WITHHOLD AUTHORITY TO VOTE FOR ANY INDIVIDUAL NOMINEE, MARK THE
BOX NEXT TO THE NOMINEE'S NAME BELOW.)
 
    / /LI-SAN HWANG  / /J. CHRISTOPHER LEWIS  / /PATRICK C. HADEN
    / /JAMES J. SHELTON  / /DANIEL A. WHALEN
 
 2.   SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING.
 
      THE DIRECTORS RECOMMEND A VOTE FOR ALL NOMINEES LISTED IN PROPOSAL 1.
 
                 (CONTINUED AND TO BE SIGNED ON THE OTHER SIDE)
<PAGE>
                          (CONTINUED FROM OTHER SIDE)
 
    Unless a contrary direction is indicated, this Proxy will be voted FOR all
nominees listed in Proposal 1; if specific instructions are indicated, this
Proxy will be voted in accordance therewith.
 
    All proxies to vote at said Meeting or any adjournment thereof heretofore
given by the undersigned are hereby revoked. Receipt of Notice of Annual Meeting
and Proxy Statement dated January 12, 1998 is acknowledged.
 
    Please mark, sign, date and return this Proxy in the accompanying prepaid
envelope. THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF TETRA
TECH, INC.
                                                    Dated: _______________, 1998
 
                                                    ____________________________
                                                            (Signature)
                                                    ____________________________
                                                            (Signature)
 
                                                  Please sign exactly as your
                                                  name appears hereon. When
                                                  shares are held by joint
                                                  tenants, both should sign.
                                                  When signing as attorney, as
                                                  executor, administrator,
                                                  trustee or guardian, please
                                                  give full title as such. If a
                                                  corporation, please sign in
                                                  full corporate name by
                                                  President or other authorized
                                                  officer. If a partnership,
                                                  please sign in partnership
                                                  name by authorized person.


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