TETRA TECH INC
PRE 14A, 1997-08-05
ENGINEERING SERVICES
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<PAGE>
                                  SCHEDULE 14A
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )
 
    Filed by the Registrant /X/
    Filed by a Party other than the Registrant / /
 
    Check the appropriate box:
    /X/  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    / /  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section240.14a-11(c) or
         Section240.14a-12
 
                                           TETRA TECH, INC.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
                                                    N/A
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required.
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1)
     and 0-11.
     (1) Title of each class of securities to which transaction applies:
         -----------------------------------------------------------------------
     (2) Aggregate number of securities to which transaction applies:
         -----------------------------------------------------------------------
     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
         filing fee is calculated and state how it was determined):
         -----------------------------------------------------------------------
     (4) Proposed maximum aggregate value of transaction:
         -----------------------------------------------------------------------
     (5) Total fee paid:
         -----------------------------------------------------------------------
/ /  Fee paid previously with preliminary materials.
/ /  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.
     (1) Amount Previously Paid:
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     (2) Form, Schedule or Registration Statement No.:
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     (3) Filing Party:
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     (4) Date Filed:
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<PAGE>
                                                                PRELIMINARY COPY
 
                                TETRA TECH, INC.
 
                                ----------------
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                         TO BE HELD SEPTEMBER 15, 1997
 
                            ------------------------
 
To the Stockholders of
 
  TETRA TECH, INC.:
 
    A Special Meeting of the Stockholders (the "Special Meeting") of Tetra Tech,
Inc., a Delaware corporation (the "Company"), will be held on Monday, September
15, 1997 at 10:00 a.m., Pacific Time, at the Company's principal executive
offices located at 670 North Rosemead Boulevard, Pasadena, California 91107, for
the following purposes as described in the accompanying Proxy Statement:
 
    1.  To consider and act upon a proposal to amend the Company's Certificate
       of Incorporation to increase the number of authorized shares of common
       stock, $.01 par value per share ("Common Stock"), from 20,000,000 to
       30,000,000.
 
    2.  To transact such other business as may properly come before the Special
       Meeting or any adjournment or adjournments thereof.
 
    The Board of Directors has fixed the close of business on August 1, 1997 as
the record date for the determination of stockholders entitled to vote at the
Special Meeting or any adjournment or adjournments thereof, and only record
holders of the Company's Common Stock and Series A Preferred Stock, $.01 par
value per share, at the close of business on that day will be entitled to vote.
 
                                          By Order of the Board of Directors
 
                                          Richard A. Lemmon
                                          VICE PRESIDENT AND SECRETARY
 
Pasadena, California
August 15, 1997
 
    YOU ARE URGED TO VOTE UPON THE MATTER PRESENTED AND TO SIGN, DATE AND
PROMPTLY RETURN THE ENCLOSED PROXY IN THE ENVELOPE PROVIDED. IT IS IMPORTANT FOR
YOU TO BE REPRESENTED AT THE SPECIAL MEETING. NOT VOTING WILL HAVE THE SAME
EFFECT AS VOTING "NO" ON PROPOSAL NO. 1. PROXIES ARE REVOCABLE AT ANY TIME AND
THE EXECUTION OF YOUR PROXY WILL NOT AFFECT YOUR RIGHT TO VOTE IN PERSON IF YOU
ARE PRESENT AT THE SPECIAL MEETING.
<PAGE>
                                                                PRELIMINARY COPY
 
                                TETRA TECH, INC.
                          670 NORTH ROSEMEAD BOULEVARD
                           PASADENA, CALIFORNIA 91107
 
                            ------------------------
 
                                PROXY STATEMENT
                        SPECIAL MEETING OF STOCKHOLDERS
                         TO BE HELD SEPTEMBER 15, 1997
 
                            ------------------------
 
                              GENERAL INFORMATION
 
    This Proxy Statement is being sent on or about August 15, 1997 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 a Special
Meeting of Stockholders of the Company (the "Special Meeting"), which will be
held at 10:00 a.m., Pacific Time, on Monday, September 15, 1997, at the
Company's principal executive offices located at 670 North Rosemead Boulevard,
Pasadena, California 91107, and at any meetings held upon adjournment thereof.
The record date for the Special Meeting is the close of business on August 1,
1997 (the "Record Date"), and all holders of record of the Company's common
stock, $.01 par value per share (the "Common Stock"), and Series A Preferred
Stock, $.01 par value per share (the "Series A Stock"), on the Record Date are
entitled to notice of the Special Meeting and to vote at the Special Meeting and
any meetings held upon adjournment thereof.
 
    A proxy form is enclosed. Whether or not you plan to attend the Special
Meeting in person, please date, sign and return the enclosed proxy as promptly
as possible, in the postage prepaid envelope provided, to ensure that your
shares will be voted at the Special 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 Special Meeting and
voting in person. Unless contrary instructions are given, any such proxy, if not
revoked, will be voted at the Special Meeting for approval of the proposed
amendment to the Company's Certificate of Incorporation to increase the number
of authorized shares of Common Stock from 20,000,000 to 30,000,000 (the
"Amendment"), and 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 and Series A Stock. At the Record Date, the Company had outstanding
16,550,745 shares of Common Stock and 1,231,840 shares Series A Stock. For each
share of Common Stock or Series A Stock held on the Record Date, a stockholder
is entitled to one vote on all matters to be considered at the Special Meeting.
 
    Approval of the Amendment requires the affirmative vote of the holders of a
majority of the outstanding shares of Common Stock and Series A Stock as of the
Record Date entitled to vote on this matter at the Meeting. Neither an
abstention nor a broker non-vote is an affirmative vote and, therefore, both
will have the same legal effect as a vote against the approval of the proposed
Amendment. Broker non-votes occur when a broker holding shares of Common Stock
in street name withholds its vote on certain non-routine matters because the
broker has not received instructions from the beneficial owner of those shares
and does not have discretionary authority to vote on such non-routine matters
without specific instructions. Brokers holding shares in street name must
receive specific instructions from the beneficial owners in order to have the
authority to vote, in person or by proxy, on certain non-routine matters. When a
beneficial owner does not give specific instructions to the broker, the broker,
as the holder of record, is
 
                                       1
<PAGE>
entitled to vote only on "routine" matters and must withhold its votes as to any
"non-routine" matters. Where a proxy solicitation includes a non-routine
proposal and the broker does not receive specific instructions from the
beneficial owner, the resulting proxy is considered a "limited proxy." Shares
represented by limited proxies are considered present for quorum purposes, but
are not considered present for purposes of determining the total number of
shares with voting power present with regard to a non-routine proposal. The
resulting broker non-vote of such a limited proxy will be treated as an
abstention on such non-routine proposal. The proposed Amendment is a non-routine
proposal.
 
    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 Special 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.
 
    The Common Stock is listed for trading under the symbol "WATR" on The Nasdaq
National Market ("Nasdaq"), which is operated by The Nasdaq Stock Market, Inc.
On August 1, 1997, the closing price for a share of Common Stock on Nasdaq was
$23.75.
 
    The principal executive offices of the Company are located at 670 North
Rosemead Boulevard, Pasadena, California 91107, and the Company's telephone
number is (626) 351-4664.
 
    THIS PROXY STATEMENT CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE MEANING
OF SECTION 27A OF THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"),
AND SECTION 21E OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (THE
"EXCHANGE ACT"). THESE STATEMENTS ARE FOUND PRINCIPALLY IN THE SECTION OF THIS
PROSPECTUS STATEMENT ENTITLED "THE WHALEN ACQUISITION." ACTUAL RESULTS COULD
DIFFER MATERIALLY FROM THOSE PROJECTED IN THE FORWARD-LOOKING STATEMENTS AS A
RESULT OF CERTAIN CONSIDERATIONS, INCLUDING THOSE DETAILED FROM TIME TO TIME IN
THE COMPANY'S FILINGS WITH THE SECURITIES AND EXCHANGE COMMISSION UNDER THE
SECURITIES ACT AND THE EXCHANGE ACT.
 
                                 PROPOSAL NO. 1
                     APPROVAL OF AMENDMENT TO THE COMPANY'S
                          CERTIFICATE OF INCORPORATION
 
                                    OVERVIEW
 
    In July 1997, the Board of Directors declared advisable and unanimously
approved an amendment of the Company's Certificate of Incorporation to increase
the number of authorized shares of Common Stock from 20,000,000 shares to
30,000,000 shares. No increase in the number of shares of Preferred Stock of the
Company, currently 2,000,000 shares, is proposed or anticipated. As more fully
set forth below, the proposed Amendment is intended to permit the automatic
conversion of the outstanding shares of Series A Stock into shares of Common
Stock and to improve the Company's flexibility in meeting its future needs for
unreserved Common Stock.
 
    If the Amendment is approved by the stockholders, it will become effective
upon the filing of a Certificate of Amendment of Certificate of Incorporation
(the "Certificate of Amendment") with the Delaware Secretary of State. The text
of the second paragraph of Article IV of the Company's Certificate of
Incorporation will read as follows:
 
       "The total number of shares of stock that the Corporation shall
       have authority to issue is thirty-two million (32,000,000),
       consisting of thirty million (30,000,000) shares of common stock,
       par value $0.01, and two million (2,000,000) shares of preferred
       stock, par value $0.01. The designations and the powers,
       preferences and rights, and the qualifications, limitations or
       restrictions thereof are as follows:"
 
                                       2
<PAGE>
    As of the close of business on the Record Date, of the 20,000,000 shares
authorized, 16,550,745 shares of Common Stock of the Company were issued and
outstanding, 2,939,939 shares of Common Stock were reserved for issuance upon
exercise of outstanding stock options and 463,915 shares were reserved for
future issuance under the Company's stock benefit plans. Accordingly, only
45,401 shares of Common Stock were unreserved on the Record Date. As of the
close of business on the Record Date, 1,231,840 shares of Series A Stock were
outstanding. Such shares of Series A Stock, upon conversion into shares of
Common Stock, shall be restored to the status of authorized but unissued shares
of Preferred Stock.
 
REASONS FOR AND POSSIBLE EFFECTS OF THE PROPOSED AMENDMENT
 
    CONVERSION OF SERIES A STOCK
 
    On June 11, 1997, the Company completed the acquisition of Whalen & Company,
Inc., a Delaware corporation ("WhalenCo"), and Whalen Service Corps Inc., a
Delaware corporation ("Whalen Service" and, collectively with WhalenCo, the
"Whalen Company"), pursuant to the terms of an Agreement and Plan of
Reorganization dated as of June 11, 1997 (the "Merger Agreement") among the
Company, WhalenCo, Whalen Service and the stockholders of WhalenCo and Whalen
Service (the "Whalen Stockholders"). The Merger Agreement provided for the
merger of WhalenCo and Whalen Service with and into the Company (the "Merger").
 
    In connection with the Merger, the Company issued to the Whalen Stockholders
an aggregate of 1,680,000 shares of Common Stock and 1,231,840 shares of Series
A Stock. Pursuant to the Certificate of Designation of Preferences of Series A
Preferred Stock, as filed by the Company with the Delaware Secretary of State on
June 11, 1997, each share of Series A Stock will automatically be converted into
one share of Common Stock immediately upon the filing of the Certificate of
Amendment with the Delaware Secretary of State. IF THE AMENDMENT IS NOT
APPROVED, DANIEL A. WHALEN (THE "PRINCIPAL WHALEN STOCKHOLDER") MAY, PURSUANT TO
THE TERMS OF THE MERGER AGREEMENT, ELECT TO CAUSE THE COMPANY TO REPURCHASE ALL
SHARES OF SERIES A STOCK (THE "PUT OPTION") AT THE AVERAGE CLOSING PRICE OF THE
COMMON STOCK ON THE FIVE TRADING DAYS ENDING ON THE LAST TRADING DAY PRIOR TO
THE PRINCIPAL WHALEN STOCKHOLDER'S EXERCISE OF THE PUT OPTION. ACCORDINGLY,
ASSUMING AN AVERAGE CLOSING PRICE OF $25.00, THE COMPANY WOULD BE REQUIRED TO
PAY $30,796,000 TO THE WHALEN STOCKHOLDERS TO REDEEM THE SERIES A STOCK UPON THE
EXERCISE OF THE PUT OPTION.
 
    The Company was not required to obtain stockholder approval of the Merger
under the Delaware General Corporation Law or Nasdaq rules and regulations since
the aggregate number of shares of Common Stock and Series A Stock issued to the
Whalen Stockholders represented less that 20% of the outstanding shares of
Common Stock on the effective date of the Merger.
 
    FLEXIBILITY IN SHARE ISSUANCE
 
    As indicated above, as of the Record Date, the Company had only 45,401
authorized but unreserved and unissued shares of Common Stock available for
future issuance. This severely limits the ability of the Board of Directors to
issue shares of Common Stock without seeking stockholder approval. Obtaining
stockholder approval is a time consuming, expensive process and could delay or
prevent the Company from taking such actions as potential acquisitions,
financings, stock splits, stock dividends or additional compensation plans.
 
    If the Amendment is approved, approximately 8,813,561 authorized, unreserved
and unissued shares of Common Stock (after giving effect to the conversion of
the Series A Stock) will be available for issue from time to time for such
purposes as the Board of Directors may approve. No further vote of the
stockholders of the Company will be required, except as provided under Delaware
law or under the rules of Nasdaq or any other national securities exchange on
which shares of Common Stock of the Company are then listed. The availability of
additional shares for issue, without the delay and expense of
 
                                       3
<PAGE>
obtaining the approval of stockholders at a subsequent special meeting, will
afford the Company greater flexibility in acting upon proposed transactions in
which shares of Common Stock may be issued.
 
    POSSIBLE EFFECTS
 
    The additional shares of Common Stock to be authorized by adoption of the
Amendment would have rights identical to the currently outstanding shares of
Common Stock of the Company. Adoption of the proposed Amendment and issuance of
the Common Stock would not affect the rights of the holders of currently
outstanding shares of Common Stock, except for effects incidental to increasing
the number of outstanding shares of Common Stock.
 
    Stockholders should note that authorized but unissued stock could be issued
by the Board of Directors for the purpose of strategic acquisition
opportunities. The Company continuously evaluates the marketplace for these
opportunities to position itself to address existing and emerging markets. The
Company views acquisitions as a key component of its growth strategy, and
intends to use both securities and cash, as it deems appropriate, to fund such
acquisitions. In addition, the authorized but unissued stock could be issued by
the Board of Directors for the purposes of deterring proposals that are opposed
by the Board of Directors such as potential unsolicited takeover attempts. The
Board is not currently aware of any attempt to takeover or acquire the Company,
and has no current plans to issue additional shares of Common Stock other than
pursuant to the exercise of outstanding stock options and stock options that
might be granted in the future under the Company's employee benefit plans, or
pursuant to a possible split of the Common Stock.
 
    The Board of Directors believes that the benefits of providing the Company
with the flexibility to issue shares without delay for any purpose outweighs the
possible disadvantages discussed above, and that it is prudent and in the best
interests of the stockholders to provide the greater flexibility that will
result from the approval of the proposed increase in authorized shares.
 
                             THE WHALEN ACQUISITION
 
THE WHALEN COMPANY
 
    The Whalen Company provides a full range of wireless telecommunications site
development services for Personal Communications Services (PCS), cellular,
Enhanced Specialized Mobile Radio (ESMR), air-to-ground, microwave, paging fiber
optic and switching centers technology. It has successfully sited in excess of
10,000 locations for over 120 systems worldwide. For the year ended December 31,
1996, the Whalen Company had revenues of approximately $45 million. The Company
believes that the acquisition of the Whalen Company provides the opportunity for
the Company's stockholders to recognize strategic and financial benefits.
 
    The Company believes that the Merger represents a complementary technical
fit with its current capabilities. The consulting and engineering requirements
associated with this industry; the siting issues including site identification,
leasing and zoning; the construction management duties; and the environmental
overlays have technical synergy with the Company's existing expertise and
established management systems. The Company also believes that the Merger
benefits its strategic objective of further balancing the Company's revenue mix
between federal and private sector programs, and will increase the amount of the
Company's business driven by economics rather than regulatory requirements. The
Whalen Company further allows the Company to participate in the growing
telecommunications market as an established service provider. In addition, the
Company's domestic and international office network may help to facilitate the
Whalen Company's growth, as geographic presence plays a role in the marketing,
sales and regulatory areas.
 
                                       4
<PAGE>
    THE FOREGOING STATEMENTS CONTAIN FORWARD-LOOKING STATEMENTS REGARDING THOSE
BENEFITS TO THE COMPANY THAT MANAGEMENT BELIEVES MAY BE ACHIEVED THROUGH THE
MERGER WITH THE WHALEN COMPANY. REALIZATION OF MANAGEMENT'S BELIEFS WILL DEPEND
ON A NUMBER OF FACTORS, INCLUDING MANAGEMENT'S SUCCESSFUL EXECUTION OF ITS
BUSINESS PLAN FOR INTEGRATING THE OPERATIONS OF THE WHALEN COMPANY, THE MARKET'S
RECEPTION TO THE COMBINATION OF THE COMPANY AND THE WHALEN COMPANY, AND OTHER
FACTORS BEYOND THE COMPANY'S CONTROL.
 
TERMS OF THE MERGER
 
    In connection with the Merger, the Whalen Stockholders received aggregate
consideration in the amount of $52,456,144, as follows:
 
        (i) The Company issued to the Whalen Stockholders an aggregate of
    1,680,000 shares of Common Stock and 1,231,840 shares of Series A Stock. For
    purposes of the Merger Agreement, each share of Common Stock and Series A
    Stock was valued at $15.25, for an aggregate value of $44,405,560.
 
        (ii) The Company paid to the Whalen Stockholders cash in the aggregate
    amount of $8,050,584.
 
    On the business day prior to the Merger, WhalenCo distributed to the Whalen
Stockholders (i) cash in the amount of $4,138,396 and (ii) accounts receivable
having a net value of $18,455,838.
 
    In determining the consideration to be paid in the Merger, the Company
investigated the Whalen Company and its business and determined an approximate
aggregate value of the Whalen Company to the Company based on investment factors
including the book value of the Whalen Company's assets, an appropriate multiple
of the Whalen Company's current and future earnings, the Whalen Company's
backlog and current contracts, the Whalen Company's revenues, the Whalen
Company's reputation in the field of wireless telecommunications site
development, and the compatibility of the Whalen Company's geographic scope and
technical capabilities. A final determination of such value was arrived at by
means of arm's length bargaining among the parties to the Merger Agreement.
 
CERTAIN OTHER ITEMS RELATED TO THE ACQUISITION
 
    REGISTRATION RIGHTS AGREEMENT
 
    The shares of Common Stock and Series A Stock issued by the Company to the
Whalen Stockholders in connection with the Merger were not registered under the
Securities Act. Accordingly, such shares of Common Stock and Series A Stock are
restricted securities under the Securities Act and may not be resold or
transferred unless first registered under the federal securities laws or unless
an exemption from such registration is available.
 
    In order to provide the Whalen Stockholders with liquidity, the Company
entered into a Registration Rights Agreement, dated as of June 11, 1997, with
the Whalen Stockholders (the "Registration Rights Agreement"). Under the
Registration Rights Agreement, the Company has agreed to file a Registration
Statement on Form S-3 providing for the sale by the Whalen Stockholders,
pursuant to Rule 415 under the Securities Act, of their shares of Common Stock
issued in connection with the Merger, including those shares issued upon
conversion of the shares of Series A Stock (collectively, the "Registrable
Securities"). The Company will use commercially reasonable efforts to cause such
Registration Statement to become effective on or before December 10, 1997 and to
keep such Registration Statement continuously effective for a period ending on
the date on which all Whalen Stockholders are eligible to sell their Registrable
Securities under Rule 144(k) (or similar successor Rule) under the Securities
Act.
 
    In addition, in the event that the Company determines to register any shares
of Common Stock, or any securities convertible into or exchangeable or
exercisable for shares of Common Stock (other than a registration relating to
the sale of securities to employees of the Company pursuant to an employee
benefit plan or pursuant to a transaction of the type described in Rule 145
under the Securities Act), the Whalen Stockholders are entitled to include their
Registrable Securities in such registration.
 
                                       5
<PAGE>
    AMENDMENT OF CREDIT AGREEMENT
 
    In connection with the Merger, the Company entered into the Second Amendment
dated as of June 20, 1997 (the "Second Amendment") to its Credit Agreement dated
as of September 15, 1995 with Bank of America Illinois (as amended by the Second
Amendment, the "Credit Agreement") for the principal purpose of increasing the
revolving credit facility thereunder (the "Facility"). The Credit Agreement
currently provides for a Facility of $25,000,000, including standby letters of
credit up to a maximum amount of $10,000,000 outstanding at any one time. The
Facility is scheduled to be reduced to $20,000,000 on May 30, 1998 and to
$15,000,000 on May 30, 1999. Interest on borrowings under the Facility is
payable at the Company's option at a base rate (Federal funds rate plus 0.50% or
the bank's reference rate) as defined in the Credit Agreement or (b) at a
eurodollar rate plus a margin which ranges from 0.75% to 1.25%. Borrowings under
the Facility are secured by the stock of four of the Company's subsidiaries,
including Whalen & Company, Inc. Such subsidiaries have also guaranteed the
Company's obligations under the Credit Agreement. The Credit Agreement contains
various covenants including, but not limited to, restrictions related to
tangible net worth, net income, additional indebtedness, asset sales, mergers
and acquisitions, creations of liens, and dividends on capital stock (other than
stock dividends). The Facility matures on May 30, 2000 or earlier at the
discretion of the Company upon payment in full of loans and other obligations.
As of June 29, 1997, borrowings under the Facility totalled $8,000,000 and
outstanding letters of credit totalled $954,974.
 
    FORMATION OF NEW SUBSIDIARIES
 
    Immediately following the Merger, the Company formed Whalen & Company, Inc.,
a Delaware corporation ("New WhalenCo"), and Whalen Service Corps Inc., a
Delaware corporation ("New Whalen Service"), as wholly-owned subsidiaries. On
June 12, 1997, the Company transferred the former assets and liabilities of
WhalenCo to New WhalenCo, and transferred the former assets and liabilities of
Whalen Service to New Whalen Service. New WhalenCo currently engages in the
business formerly engaged in by WhalenCo, and New Whalen Service currently
engages in the business formerly engaged in by Whalen Service.
 
    ACCOUNTING TREATMENT
 
    The Merger is to be treated as a purchase for accounting purposes. In
accordance with purchase accounting, the final determination of the purchase
price and the allocation of net assets acquired will be derived from the fair
values of the consideration paid and the net assets.
 
    MARKET INFORMATION
 
    On May 16, 1997, the business day prior to the date on which the Company
announced the letter of intent to acquire the Whalen Company, the closing price
for the Common Stock was $16.25. On June 11, 1997, the closing date of the
Merger, the closing price of the Common Stock on Nasdaq was $20.00.
 
VOTE REQUIRED
 
    The approval of the Amendment requires the affirmative vote of a majority of
the outstanding shares of Common Stock and Series A Stock as of the Record Date
entitled to vote on this matter at the Special Meeting. Neither an abstention
nor a broker non-vote is an affirmative vote and, therefore, both will have the
same effect as a vote against the Amendment. See "General Information."
 
RECOMMENDATION OF THE BOARD OF DIRECTORS
 
    FOR ALL OF THE FOREGOING REASONS, THE BOARD BELIEVES THAT THE AMENDMENT IS
IN THE BEST INTERESTS OF THE COMPANY AND ITS STOCKHOLDERS AND UNANIMOUSLY
RECOMMENDS A VOTE "FOR" APPROVAL THEREOF. PROXIES WILL BE VOTED FOR THIS
PROPOSAL UNLESS OTHERWISE SPECIFICALLY INDICATED.
 
                                       6
<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 July 15, 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 and certain executive officers of the Company, and (iii) all
executive 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)....................................................   1,119,357            6.3%
  Tetra Tech, Inc.
  670 N. Rosemead Blvd.
  Pasadena, California 91107
 
Daniel A. Whalen(3)................................................   2,911,840           16.4
  Whalen & Company, Inc.
  3675 Mt. Diablo Blvd.
  Suite 360
  Lafayette, California 94549
 
Pilgrim Baxter & Associates, Ltd.(4)...............................   1,450,864            8.3
  Harold J. Baxter
  Gary I. Pilgrim
  1255 Drummers Lane
  Wayne, Pennsylvania 19087
 
The Northwestern Mutual Life Insurance Company(5)..................     934,500            5.3
  720 E. Wisconsin Avenue
  Milwaukee, Wisconsin 53202
 
RCM Capital Management, L.L.C.(6)
RCM Limited L.P.
RCM General Corporation............................................   1,374,300            7.9
  Four Embarcadero Center, Suite 2900
  San Francisco, California 94111
 
Dresdner Bank AG(7)................................................   1,374,300            7.9
  Jurgen-Ponto-Platz 1
  60301 Frankfurt, Germany
 
J. Christopher Lewis(8)............................................      48,311          *
 
Patrick C. Haden(9)................................................      13,131          *
 
James J. Shelton(10)...............................................       7,226          *
 
Thomas D. Brisbin(11)..............................................      13,732          *
 
Charles R. Faust(12)...............................................      39,702          *
 
James M. Jaska(13).................................................      20,475          *
 
All directors and executive officers as a group (12 persons)(14)...   4,454,223           25.1
</TABLE>
 
- ------------------------
 
  * Amount represents less than 1% of the Company's Common Stock.
 
                                       7
<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.
    Includes 1,231,840 shares of Common Stock issuable upon conversion of the
    outstanding shares of Series A Stock. See Note(3).
 
 (2) Excludes an aggregate of 16,415 shares of Common Stock owned by Dr. Hwang's
    adult children as to which Dr. Hwang disclaims beneficial ownership.
    Includes 5,468 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997.
 
 (3) Mr. Whalen was elected a director of the Company, the Executive Vice
    President--Telecommunications of the Company and the President of each of
    New WhalenCo and New Whalen Service as of the effective date of the Merger.
    Includes 1,185,646 shares of Common Stock issuable upon conversion of shares
    of Series A Stock held by the Registrant. Also includes (i) 10,500 shares of
    Common Stock and 7,699 shares of Common Stock issuable upon conversion of
    Series A Stock held by Daniel A. Whalen and Katharine C. Whalen as Trustees
    for the MJW Whalen Trust 1997--D, (ii) 10,500 shares of Common Stock and
    7,699 shares of Common Stock issuable upon conversion of Series A Stock held
    by Daniel A. Whalen and Katharine C. Whalen as Trustees for the ACW Whalen
    Trust 1997--D, (iii) 10,500 shares of Common Stock and 7,699 shares of
    Common Stock issuable upon conversion of Series A Stock held by Daniel A.
    Whalen and Katharine C. Whalen as Trustees for the MCW Whalen Trust 1997--D,
    (iv) 10,500 shares of Common Stock and 7,699 shares of Common Stock issuable
    upon conversion of Series A Stock held by Daniel A. Whalen and Katharine C.
    Whalen as Trustees for the MJW Whalen Trust 1997--K, (v) 10,500 shares of
    Common Stock and 7,699 shares of Common Stock issuable upon conversion of
    Series A Stock held by Daniel A. Whalen and Katharine C. Whalen as Trustees
    for the ACW Whalen Trust 1997--K, and (vi) 10,500 shares of Common Stock and
    7,699 shares of Common Stock issuable upon conversion of Series A 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), dated 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 7,323 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997.
 
 (9) Excludes an aggregate of 1,718 shares of Common Stock owned by Mr. Haden's
    wife as to which Mr. Haden disclaims beneficial ownership. Includes 7,323
    shares issuable with respect to stock options exercisable within 60 days
    after July 15, 1997.
 
(10) Includes 2,344 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 4,882 shares issuable with
    respect to stock options exercisable within 60 days after July 15, 1997.
 
                                       8
<PAGE>
(11) Includes 13,437 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997.
 
(12) Includes 6,047 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997. Additionally, Dr. Faust's minor children
    own an aggregate of 1,406 shares of Common Stock as to which Dr. Faust
    disclaims beneficial ownership.
 
(13) Includes 20,156 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997.
 
(14) Includes 105,343 shares issuable with respect to stock options exercisable
    within 60 days after July 15, 1997.
 
                         INDEPENDENT PUBLIC ACCOUNTANTS
 
    Deloitte & Touche LLP, certified public accountants, is acting as the
Company's independent auditors for the fiscal year ending 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 and the
applicable published rules and regulations thereunder. A representative of that
firm is expected to be available at the Special Meeting to respond to
appropriate questions.
 
                  STOCKHOLDER PROPOSAL FOR 1998 ANNUAL MEETING
 
    Any stockholder who wishes to present a proposal for action at the 1998
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, 1997
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 Special Meeting, but, if other matters do properly come before the Special
Meeting, it is intended that the persons named as proxies in the proxy will vote
on them in accordance with their best judgment.
 
    The Company has filed with the Securities and Exchange Commission a Current
Report on Form 8-K and a Current Report on Form 8-K/A (Amendment No. 1) with
respect to the acquisition of the Whalen Company. In addition, the Company plans
to file a Current Report on Form 8-K/A (Amendment No. 2) prior to the date of
the Special Meeting which will include the required audited financial statements
and pro forma financial information relating to the acquisition of the Whalen
Company. COPIES OF THESE REPORTS 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. These Reports are not part of the Company's soliciting material.
 
                                          By Order of the Board of Directors
 
                                          Richard A. Lemmon
                                          VICE PRESIDENT AND SECRETARY
 
Pasadena, California
August 15, 1997
 
                                       9
<PAGE>
PRELIMINARY COPY
 
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 a Special Meeting of the Stockholders of TETRA TECH, INC.
to be held at the principal executive offices of TETRA TECH INC., 670 N.
Rosemead Boulevard, Pasadena, California 91107 on Monday, September 15, 1997 at
10:00 a.m., Pacific Time, and at any and all adjournments thereof, on the
proposals set forth below and any other matters properly brought before the
Meeting.
 
1.  PROPOSAL TO APPROVE THE AMENDMENT TO THE COMPANY'S CERTIFICATE OF
INCORPORATION:
 
             / / FOR            / / AGAINST            / / ABSTAIN
 
2.  Such other matters as may properly come before the Meeting.
 
    THE DIRECTORS RECOMMEND A VOTE FOR APPROVAL OF THE AMENDMENT TO THE
COMPANY'S CERTIFICATE OF INCORPORATION.
 
                 (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
approval of the Amendment to the Company's Certificate of Incorporation; 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 the Notice of Annual
Meeting and Proxy Statement dated August 15, 1997 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: _______________, 1997
                                                    ____________________________
                                                          (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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