TETRA TECH INC
424B1, 1998-11-06
ENGINEERING SERVICES
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<PAGE>

PROSPECTUS



                               TETRA TECH, INC.


                        274,886 SHARES OF COMMON STOCK

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


           The 274,886 shares (the "Shares") of Common Stock, par value $.01 
per share ("Common Stock"), of Tetra Tech, Inc. ("Tetra Tech" or the 
"Company") offered hereby are to be sold by the persons named herein under 
"Selling Stockholders." 


          INVESTORS SHOULD CONSIDER THE INFORMATION SET FORTH IN THIS
    PROSPECTUS BEGINNING ON PAGE 4 UNDER "RISK FACTORS" PRIOR TO PURCHASE.

          Holders of the Shares may resell the Shares from time to time in 
transactions on the Nasdaq National Market, and may sell the Shares through a 
broker or brokers or in the over-the-counter market at prices prevailing on 
such exchange or over-the-counter market, as appropriate, at the times of 
such sales. The Selling Stockholders may also make private sales directly or 
through such broker or brokers.  See "Plan of Distribution."  Sales of the 
Shares may be effected by selling such securities to or through 
broker-dealers, and such broker-dealers may receive compensation in the form 
of discounts, concessions or commissions from the sellers thereof.  Such 
sellers and any broker-dealer who acts in connection with the sales of Shares 
may be deemed to be "underwriters" as that term is defined in the Securities 
Act of 1933, as amended (the "Securities Act"), and any commissions received 
by them and profit on any resale of the Shares might be deemed to be 
underwriting discounts and commissions under the Securities Act.

          None of the proceeds from the sale of the Shares will be received 
by the Company.  The Company has agreed to bear all expenses (other than 
underwriting discounts and selling commissions and fees and expenses of 
counsel and other advisors to the Selling Stockholders) in connection with 
the registration and sale of the Shares being registered hereby.  See "Plan 
of Distribution."
                                ------------

          The Common Stock is traded on the Nasdaq National Market under the 
symbol "WATR."  On November 5, 1998, the reported closing price of the 
Common Stock on the Nasdaq National Market was $22 1/16 per share.

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

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.  ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

No dealer, salesman or other person has been authorized to give any 
information or to make any representations not contained or incorporated by 
reference in this Prospectus, and, if given or made, such information or 
representations must not be relied upon as having been authorized by the 
Company or by any other person.  All information contained in this Prospectus 
is as of the date of this Prospectus.  Neither the delivery of this 
Prospectus nor any sale made hereunder shall, under any circumstances, create 
any implication that there has been no change in the affairs of the Company 
or in the facts herein set forth since the date hereof.  This Prospectus does 
not constitute an offer to sell or a solicitation of any offer to buy any 
security other than the securities covered by this Prospectus, nor does it 
constitute an offer to or solicitation of any person in any jurisdiction in 
which such offer or solicitation may not lawfully be made.

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

             THE DATE OF THIS PROSPECTUS IS NOVEMBER 6, 1998
<PAGE>

                               AVAILABLE INFORMATION


          The Company is subject to the informational requirements of the 
Securities Exchange Act of 1934 (the "Exchange Act"), and the rules and 
regulations thereunder, and in accordance therewith files reports, proxy 
statements and other information with the Securities and Exchange Commission 
(the "Commission").  Reports, proxy statements and other information filed by 
the Company with the Commission can be inspected and copied at the public 
reference facilities maintained by the Commission at Room 1024, Judiciary 
Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 and at the following 
Regional Offices of the Commission:  Citicorp Center, 500 West Madison 
Street, Suite 1400, Chicago, Illinois 60661; and Seven World Trade Center, 
13th Floor, New York, New York 10048.  Copies of such material can be 
obtained by mail from the Public Reference Section of the Commission at 
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed 
rates.  Such reports, proxy statements and other information concerning the 
Company are also available for inspection at the offices of The Nasdaq Stock 
Market, 1735 K Street, N.W., Washington, D.C. 20006.  In addition the 
Commission maintains an Internet site at http://www.sec.gov that contains 
reports, proxy and information statements and other information regarding 
registrants, including the Company, that file electronically with the 
Commission.


          The Company has filed with the Commission a registration statement 
on Form S-3 (together with all exhibits, schedules, amendments, and 
supplements thereto, the "Registration Statement") under the Securities Act 
with respect to the Common Stock offered by this Prospectus.  This 
Prospectus, which forms a part of the Registration Statement, does not 
contain all the information set forth in the Registration Statement (certain 
parts of which have been omitted in accordance with the rules and regulations 
of the Commission).  For further information with respect to the Company and 
the Common Stock, reference is made to the Registration Statement.  
Statements contained in this Prospectus as to the contents of any contract, 
agreement or other document are not necessarily complete, and, in each 
instance, reference is made to the copy of the document filed as an exhibit 
to the Registration Statement, each such statement being qualified in all 
respects by reference to such exhibit.  The Registration Statement may be 
inspected and copied at the public reference facilities at the Commission's 
offices at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, 
D.C. 20549, and at the Commission's Regional Offices at:  Citicorp Center, 
500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and Seven World 
Trade Center, 13th Floor, New York, New York 10048.  Copies of all or any 
part thereof may be obtained from such office upon payment of prescribed fees.


                                       2


<PAGE>

               INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

          This Prospectus incorporates by reference certain documents 
relating to the Company which are not delivered herewith.  These documents 
(other than the exhibits to such documents, unless such exhibits are 
specifically incorporated by reference into such documents) are available 
without charge, upon oral or written request by any person, including any 
beneficial owner, to whom this Prospectus is delivered, from the Company, 670 
N. Rosemead Boulevard, Pasadena, California 91107-2190, telephone number 
(626) 351-4664, Attention:  Richard A. Lemmon, Vice President and Secretary.

          The following documents have been filed with the Commission 
pursuant to the Exchange Act (File No. 0-11695) and are incorporated in this 
Prospectus by reference and are made a part hereof:

               1.   Annual Report on Form 10-K for the fiscal year ended 
          September 28, 1997 (the "Tetra Tech 10-K"), as filed with the 
          Commission on December 26, 1997;

               2.   Quarterly Report on Form 10-Q for the fiscal quarter ended
          December 28, 1997, as filed with the Commission on February 10, 1998;

               3.   Quarterly Report on Form 10-Q for the fiscal quarter ended 
          March 29, 1998, as filed with the Commission on May 13, 1998;

               4.   Quarterly Report on Form 10-Q for the fiscal quarter ended 
          June 29, 1998, as filed with the Commission on August 11, 1998;

               5.   Current Report on Form 8-K for event of September 22, 
          1998, as filed with the Commission on October 1, 1998;

               6.   Current Report on Form 8-K for event of December 31, 1997, 
          as filed with the Commission on January 15, 1998;

               7.   Current Report on Form 8-K/A (Amendment No. 1) for event of
          December 31, 1997, as filed with the Commission on March 16, 1998;

               8.   The portions of Tetra Tech's Proxy Statement for the Annual
          Meeting of Stockholders held on February 11, 1998 that have been
          incorporated by reference into the Tetra Tech 10-K, as filed with the
          Commission on January 9, 1998;

               9.   The portions of Tetra Tech's Annual Report to Stockholders
          for the fiscal year ended September 28, 1997 that have been
          incorporated by reference into the Tetra Tech 10-K, as filed with the
          Commission on December 26, 1997; and

               10.   The description of the Company's Common Stock which is 
          contained in the Registration Statement on Form 8-A, filed with the 
          Commission on November 13, 1991, including any amendments or reports 
          filed for the purpose of updating such description.

          All documents and reports filed by the Company pursuant to Sections 
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this 
Prospectus and prior to the termination of the offering of the Common Stock 
shall be deemed to be incorporated by reference in this Prospectus and shall 
be a part hereof from the date of filing of such documents.  Any statement 
contained in this Prospectus or in a document incorporated or deemed to be 
incorporated by reference herein shall be deemed to be modified or superseded 
for purposes of this Prospectus to the extent that a statement contained 
herein or in any subsequently filed document that also is or is deemed to be 
incorporated by reference herein modifies or supersedes such statement.  Any 
statement so modified or superseded shall not be deemed, except as so 
modified or superseded, to constitute a part of this Prospectus.

                                          3

<PAGE>

                                    RISK FACTORS

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

          THIS PROSPECTUS, INCLUDING THE INFORMATION SET FORTH BELOW, 
CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF SECTION 27A OF THE 
SECURITIES ACT OF 1933, AS AMENDED, AND SECTION 21E OF THE SECURITIES 
EXCHANGE ACT OF 1934, AS AMENDED, AND ARE INTENDED TO BE COVERED BY THE SAFE 
HARBORS CREATED THEREBY. PROSPECTIVE PURCHASERS ARE CAUTIONED THAT ALL 
FORWARD-LOOKING STATEMENTS ARE SUBJECT TO RISKS AND UNCERTAINTIES, INCLUDING, 
WITHOUT LIMITATION, THE RISKS OUTLINED IN THIS SECTION.

          POTENTIAL LIABILITY AND INSURANCE.  Because of the type of projects 
in which the Company is or may be involved, the Company's current and 
anticipated future services may involve risks of potential liability under 
Superfund, common law or contractual indemnification agreements.  It is 
difficult to assess accurately the magnitude of potential risks to the 
Company.


          The Company maintains two comprehensive general liability policies, 
both in the amount of $1,000,000.  These policies, together with two 
$9,000,000 umbrella policies, provide total general liability coverage of 
$10,000,000 for the Company's resource management and infrastructure business 
areas and coverage of $10,000,000 for its telecommunications business area.  
The Company's professional liability insurance ("E&O") policy, which includes 
pollution coverage, for 1998 provides $10,000,000 in coverage for resource 
management and infrastructure business areas, with a $100,000 self-insured 
retention.  The same E&O policy covers the telecommunications business area 
with a sublimit of $1,000,000 for each claim and $1,000,000 in the aggregate. 
The Company procures insurance coverage through a broker who is experienced 
in the engineering field. The broker, together with the Company's Risk 
Manager, review the Company's risk/insurance programs with those of the 
Company's competitors and clients. This review, combined with historical 
experience, claims history and contractual requirements, allows the Company 
to determine the adequate amount of insurance. However, because there are 
various exclusions and retentions under the Company's insurance policies, 
there can be no assurance that all liabilities that may be incurred by the 
Company are subject to insurance coverage.  In addition, the E&O policy is a 
"claims made" policy which only covers claims made during the term of the 
policy.  If a policy terminates and retroactive coverage is not obtained, a 
claim subsequently made, even a claim based on events or acts which occurred 
during the term of the policy, would not be covered by the policy.  In the 
event the Company expands its services into new markets, no assurance can be 
given that the Company will be able to obtain insurance coverage for such 
activities or, if insurance is obtained, that the dollar amount of any 
liabilities incurred in connection with the performance of such services will 
not exceed policy limits.  The premiums to be paid by the Company for its E&O 
policies during fiscal 1998 are approximately $890,000.


          The Company evaluates and determines the risk associated with 
uninsured claims.  In the event the Company determines that an uninsured 
claim has potential liability, the Company establishes an appropriate 
reserve.  The Company does not establish a reserve if it determines that the 
claim has no merit.  The Company's historical levels of insurance coverage 
and reserves have been shown to be adequate.  However, a partially or 
completely uninsured claim, if successful and of significant magnitude, could 
have a material adverse effect on the Company.


          SIGNIFICANT COMPETITION.  The market for the Company's services is 
highly competitive.  The Company competes with many other firms, ranging from 
small local firms to large national firms having greater financial and 
marketing resources than the Company.  The Company performs engineering and 
consulting services across a broad spectrum of business areas, primarily in 
the resource management, infrastructure, and the telecommunication service 
business areas. Services within these business areas are provided to a client 
base including Federal (Departments of Defense, Energy and the Interior; U.S. 
Environmental Protection Agency; and the U.S. Postal Service), state and 
local agencies, as well as the commercial sector.  The range of competitors 
for any one procurement can vary from ten to 100 firms, depending upon the 
relative value of the project, the financial terms and risks associated with 
the work, and any restrictions placed upon competition by the customer.  
Historically, competition has been based primarily on the quality and 
timeliness of service.  However, the Company believes that price has become 
an increasingly important competitive factor.  The Company believes that its 
principal competitors include Dames & Moore, Inc., E.A. 

                                          4

<PAGE>

Engineering Science & Technology, ICF Kaiser International, Inc., 
International Technology Corp., TRC Companies, Inc., URS Consultants, Inc., 
Roy F. Weston, Inc., Castle Tower Corporation, OSP Consultants, Inc. and 
Mastec, Inc.



          CONTRACTS.  The Company's contracts with Federal and State 
governments and some of its other client contracts are subject to termination
at the discretion of the client.  Some contracts made with the Federal 
government are subject to annual approval of funding and audits of the 
Company's rates.  Limitations imposed on spending by Federal government 
agencies may limit the continued funding of the Company's existing contracts 
with the Federal government and may limit the Company's ability to obtain 
additional contracts.  These limitations, if significant, could have a 
material adverse effect on the Company.


          All of the Company's contracts with the Federal government are 
subject to audit by the government, primarily by the Defense Contract Audit 
Agency (the "DCAA"), which reviews the Company's overhead rates, operating 
systems and cost proposals.  During the course of its audit, the DCAA may 
disallow costs if it determines that the Company improperly accounted for 
such costs in a manner inconsistent with Cost Accounting Standards.  A 
disallowance of costs by the DCAA could have a material adverse effect on the 
Company.  Historically, the Company has not had any material cost 
disallowances by the DCAA as a result of audit, except as further described.  
There can be no assurance that DCAA audits will not result in material cost 
disallowances in the future.  The Company's government contracts are also 
subject to renegotiation of profits in the event of a change in the 
contractual scope of work to be performed.

          In September 1995, the Company acquired Tetra Tech EM Inc. 
(formerly known as PRC Environmental Management, Inc.; "EMI").  EMI likewise 
contracts with the Federal government and such contracts are subject to the 
same auditing standards as those of the Company.  Audits and negotiations for 
the years 1987 through 1993 have recently been completed and cost 
disallowances as a result of audit and negotiation totaled approximately 
$2,900,000.  At the time of acquisition, reserves for such cost disallowances 
were established.  The Company does not believe that the ultimate resolution 
of such audits and disallowances will have a material adverse effect on the 
Company.  Audits for the years 1994 and 1995 have yet to be completed.


          The Company enters into various contracts with its clients, which 
include fixed-price contracts.  To date, in fiscal 1998, 27.3% of the 
Company's net revenue was derived from fixed-price contracts.  Under a 
fixed-price contract, the customer agrees to pay a specified price for the 
Company's performance of the entire contract.  Fixed-price contracts carry 
inherent risks, including risks of losses from underestimating costs, 
problems with new technologies and economic and other changes that may occur 
over the contract period.  Losses under fixed-price contracts, should they 
occur, could have a material adverse effect on the Company.



          The Company contracts with both domestic and international 
customers. Certain contracts with international customers are denominated in 
a currency other than the U.S. dollar.  Contracts denominated in any currency 
other than the U.S. dollar contain certain inherent risks, including risks on 
foreign currency translation and risks in expatriating funds from foreign 
countries.  To date, in fiscal 1998, 2.7% of the Company's net revenue was 
derived from the international marketplace.  As the Company's net revenue 
derived from the international marketplace increases, so do the risks 
associated in realizing the full contract value of those contracts 
denominated in foreign currencies.  The Company is currently evaluating 
options to hedge future potential losses from foreign currency transactions.


          CONFLICTS OF INTEREST.  Many of the Company's clients are concerned 
about potential or actual conflicts of interest in retaining environmental 
consultants and engineers.  For example, Federal government agencies have 
formal policies against continuing or awarding contracts that would create 
actual or potential conflicts of interest with other activities of a 
contractor.  These policies, among other things, may prevent the Company in 
certain cases from bidding for or performing contracts resulting from or 
relating to certain work the Company has performed for the government.  In 
addition, services performed for a private client may create a conflict of 
interest which precludes or limits the Company's ability to obtain work from 
other public or private entities.  The Company has, on occasion, declined to 
bid on a project because of an actual or potential conflict of interest.

          POTENTIAL VOLATILITY OF STOCK PRICE.  The market price of the 
Company's Common Stock may be significantly affected by factors such as 
quarter-to-quarter variations in the Company's results of operations, changes 

                                          5

<PAGE>

in environmental legislation and changes in investors' perception of the 
business risks and conditions in the environmental services business.  In 
addition, market fluctuations, as well as general economic or political 
conditions, may adversely affect the market price of the Company's Common 
Stock, regardless of the Company's actual performance.

          QUALIFIED PROFESSIONALS.  The Company's ability to attract and 
retain qualified scientists and engineers is an important factor in 
determining the Company's future growth and success.  The market for 
environmental professionals is competitive and there can be no assurance that 
the Company will continue to be successful in its efforts to attract and 
retain such professionals.

                               TETRA TECH, INC.

          Through a network of more than 100 offices, Tetra Tech provides 
comprehensive resource management, infrastructure and telecommunications 
support services including research and development, applied science and 
management consulting, engineering and architectural design, construction 
management, and operation and maintenance.   Tetra Tech provides these 
services to a broad base of customers worldwide.  The Company's principal 
executive offices are located at 670 N. Rosemead Boulevard, Pasadena, 
California 91107-2190 and its telephone number is (626) 351-4664.

                           ACCOUNTING PRONOUNCEMENTS

          In February 1997, the Financial Accounting Standards Board issued 
Statement of Financial Accounting Standards (SFAS) No. 128, EARNINGS PER 
SHARE, which the Company has adopted.  The Statement replaces the 
presentation of primary Earnings Per Share (EPS) with a presentation of basic 
EPS, which excludes dilution and is computed by dividing income available to 
common stockholders by the weighted average number of common shares 
outstanding for the period.  The Statement also requires the dual 
presentation of basic and diluted EPS on the face of the income statement for 
all entities with complex capital structures and requires a reconciliation of 
the numerator and denominator of the basic EPS computation to the numerator 
and denominator of the diluted EPS computation. Diluted EPS is computed 
similarly to fully diluted EPS pursuant to Accounting Principles Board 
Opinion No.15.  The following table presents selected consolidated financial 
data, including EPS computed in accordance with SFAS No. 128, for the past 
five years.

                                          6

<PAGE>

                               SELECTED CONSOLIDATED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                                                FISCAL YEARS ENDED
                                               ------------------------------------------------------------------------------------
                                               SEPT. 28,(2)      SEPT. 29,(3)      OCT. 1,(4)         OCT. 2,(5)          OCT. 3,
                                                   1997              1996             1995               1994              1993
                                               ------------      ------------      -----------       ------------      ------------
<S>                                            <C>               <C>               <C>               <C>               <C>
                                                                        (IN THOUSANDS, EXCEPT PER SHARE DATA)
STATEMENT OF OPERATIONS DATA
 Gross revenue..............................   $    246,767      $    220,099       $  120,034       $    96,472       $    74,488
 Subcontractor costs........................         55,976            59,062           32,160            28,653            23,323
                                                    -------           -------          -------           -------           -------
 Net revenue................................        190,791           161,037           87,874            67,819            51,165
 Cost of net revenue........................        141,019           122,084           65,484            51,069            38,628
                                                    -------           -------          -------           -------           -------
 Gross profit...............................         49,772            38,953           22,390            16,750            12,537
 Selling, general and administrative
   Expenses.................................         25,173            21,218           10,634             7,589             5,696
                                                    -------           -------          -------           -------           -------
 Income from operations.....................         24,599            17,735           11,756             9,161             6,841
 Net interest income (expense)..............            (20)             (776)             833               354               290
                                                    -------           -------          -------           -------           -------
 Income before income taxes.................         24,579            16,959           12,589             9,515             7,131
 Income tax expense.........................         10,323             6,854            5,036             3,806             2,852
                                                    -------           -------          -------           -------           -------
 Net income.................................    $    14,256       $    10,105       $    7,553         $   5,709         $   4,279
                                                    -------           -------          -------           -------           -------
                                                    -------           -------          -------           -------           -------
 Net income per share(1)-basic..............    $      0.61       $      0.46       $     0.37         $    0.28         $    0.21
                                                       ----              ----             ----              ----              ----
                                                       ----              ----             ----              ----              ----
 Net income per share(1)-diluted............    $      0.58       $      0.45       $     0.36         $    0.27         $    0.21
                                                       ----              ----             ----              ----              ----
                                                       ----              ----             ----              ----              ----
 Weighted average shares outstanding(1):
 Basic......................................         23,371            21,851           20,585            20,464            20,093
                                                    -------           -------          -------           -------           -------
 Diluted....................................         24,656            22,581           21,146            20,811            20,418
                                                    -------           -------          -------           -------           -------
                                                    -------           -------          -------           -------           -------
</TABLE>


<TABLE>
<CAPTION>
                                                 SEPT. 28,         SEPT. 29,         OCT. 1,            OCT. 2,          OCT. 3,
                                                   1997              1996             1995               1994              1993
                                               ------------      ------------      -----------       ------------      ------------
<S>                                            <C>               <C>               <C>               <C>               <C>
                                                                                  (IN THOUSANDS)
BALANCE SHEET DATA
 Working capital............................   $     42,539       $    32,739        $  39,872       $    24,833       $    23,722
 Total assets...............................        159,513            88,463           92,930            51,606            38,572
                                                    -------           -------          -------           -------           -------
 Long-term obligations, excluding
      current installments..................             --                --           19,045                --                --
 Stockholders' equity.......................        107,641            63,269           41,496            33,507            26,446
                                                    -------           -------          -------           -------           -------
</TABLE>

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

(1) Reflects the effect, on a retroactive basis, of a 5-for-4 stock split,
    effected in the form of a 25% stock dividend, in December 1997 and in 
    September 1998.


(2) Includes the results of operations and financial positions of IWA Engineers
    (acquired December 11, 1996), FLO Engineering, Inc. (acquired December 20,
    1996), SCM Consultants, Inc. (acquired March 19, 1997), Whalen & Company,
    Inc. (acquired June 11, 1997) and Commsite Development Corporation
    (acquired July 11, 1997) from the dates set forth  in the related purchase
    agreements.

(3) Includes the results of operations and financial position of KCM, Inc.
    (acquired November 7, 1995) from the date set forth in the related purchase
    agreement.

(4) Includes the results of operations and financial position of Tetra Tech EM
    Inc., formerly known as PRC Environmental Management, Inc. (acquired
    September 15, 1995) from the date set forth in the related purchase
    agreement.
                                        7
<PAGE>

(5) Includes the results of operations and financial positions of Simons, Li &
    Associates, Inc. (acquired October 4, 1993) and Hydro-Search, Inc.
    (acquired June 3, 1994) from the dates set forth in the related purchase
    agreements.

                                 USE OF PROCEEDS

          All of the shares of Common Stock covered hereby are being offered 
by the Selling Stockholders.  The Company will not receive any proceeds from 
the sales of Common Stock by the Selling Stockholders.

                       PRINCIPAL AND SELLING STOCKHOLDERS


          On July 9, 1998, Tetra Tech completed the acquisition of McNamee, 
Porter & Seeley, Inc., a Michigan corporation ("MPS"), pursuant to the terms 
of a Stock Purchase Agreement dated June 30, 1998 among Tetra Tech and the 
shareholders of MPS (the "MPS Acquisition").  In connection with the MPS 
Acquisition, Tetra Tech (i) issued to the shareholders of MPS an aggregate of 
274,886 shares of Common Stock and (ii) paid to the shareholders of MPS an 
aggregate of $9,601,972.39 in cash.


          The shares of Common Stock to be sold hereunder were issued to the 
former shareholders of MPS (collectively, the "Selling Stockholders") in 
connection with the MPS Acquisition.


                                        8

<PAGE>


     The following table sets forth information regarding the ownership of 
the Company's Common Stock as of September 1, 1998 (as adjusted to reflect 
the 5-for-4 stock split effected on September 15, 1998) 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, (iii) all executive officers and directors as a group, and (iv) 
each Selling Stockholder. 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           NUMBER OF        PERCENTAGE OF
                                                                                 SHARES            SHARES OF            SHARES
                                                                              BENEFICIALLY       COMMON STOCK        BENEFICIALLY
                     NAME OF BENEFICIAL OWNER(1)                                 OWNED              OFFERED             OWNED(1) 
                     ------------------------                                 ------------       ------------       -------------
<S>                                                                            <C>                <C>               <C>
Li-San Hwang (2)
     Tetra Tech, Inc.
     670 N. Rosemead Blvd.
     Pasadena, California 91107.......................................         1,619,388                  --             5.8%

Daniel A. Whalen (3)
     Whalen & Company, Inc.
     3675 Mt. Diablo Blvd.
     Suite 360
     Lafayette, California  94549.....................................         4,555,650                  --            16.3

Pilgrim Baxter & Associates, Ltd. (4)
     Harold J. Baxter
     Gary I. Pilgrim
     1255 Drummers Lane
     Wayne, Pennsylvania  19087.......................................         2,873,206                  --            10.3

J. Christopher Lewis (5)..............................................            72,658                  --              *
Patrick C. Haden (6)..................................................            24,330                  --              *
James J. Shelton (7)..................................................            15,103                  --              *
Thomas D. Brisbin (8).................................................            46,667                  --              *
Charles R. Faust (9)..................................................            43,817                  --              *
James M. Jaska (10)...................................................            55,827                  --              *
All directors and executive officers
     as a group (12 persons) (11).....................................         6,814,517                  --            24.4


                            SELLING STOCKHOLDERS
                            --------------------

Khalil Z. Atasi.......................................................            14,206              14,206              *
Dennis J. Benoit......................................................            14,206              14,206              *
</TABLE>

                                       9
<PAGE>


<TABLE>
<S>                                                                               <C>                 <C>                 <C>
Glenn S. Burkhardt, as Trustee of the
Glenn S. Burkhardt Trust dated September 12, 1996.....................            26,281              26,281              *
Thomas M. Doran, as Trustees of the
Thomas M. Doran Trust dated June 26, 1996.............................            26,281              26,281              *
Charles D. Fifield....................................................            22,020              22,020              *
Richard W. Force, as Trustee of the
Richard W. Force Trust dated June 9, 1992.............................            26,281              26,281              *
S. Joh Kang, as Trustee of the Shin Joh
Kang Trust dated January 17, 1992.....................................            26,281              26,281              *
Kenneth E. Kingsley...................................................            14,206              14,206              *
Donald E. Lund........................................................            26,281              26,281              *
John P. Oyer, as Trustee of the John P.
Oyer Trust dated January 21, 1997.....................................            26,281              26,281              *
Suresh K. Sangal, as Trustee of the
Suresh Kumar Sangal Trust dated July 22, 1992.........................            26,281              26,281              *
Philip C. Youngs......................................................            26,281              26,281              *
</TABLE>


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

*    Amount represents less than 1% of the Company's Common Stock.
(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 26,238 shares of Common Stock owned by Dr. Hwang's
     adult children as to which Dr. Hwang disclaims beneficial ownership. 
     Includes 15,990 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.
(3)  Includes 3,754,133 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) 625,000 shares of Common Stock held by Daniel A. Whalen and Katherine
     C. Whalen as Trustees for the Whalen 1997 Charitable Remainder Unitrust,
     (iii) 28,435 shares of Common Stock held by Daniel A. Whalen and Katharine
     C. Whalen as Trustees for the MJW Whalen Trust 1997 - D, (iv) 28,435 shares
     of Common Stock held by Daniel A. Whalen and Katharine C. Whalen as
     Trustees for the ACW Whalen Trust 1997 - D, (v) 28,435 shares of Common
     Stock held by Daniel A. Whalen and Katharine C. Whalen as Trustees for the
     MCW Whalen Trust 1997 - D, (vi) 28,435 shares of Common Stock held by
     Daniel A. Whalen and Katharine C. Whalen as Trustees for the MJW Whalen
     Trust 1997 - K, (vii) 28,435 shares of Common Stock held by Daniel A.
     Whalen and Katharine C. Whalen as Trustees for the ACW Whalen Trust 1997-
     K, and (viii) 28,435 shares of Common Stock held by Daniel A. Whalen and
     Katharine C. Whalen as Trustees for the MCW Whalen Trust 1997 - K.  All
     information regarding 

                                      10
<PAGE>

     share ownership is taken from and furnished in reliance upon the Schedule 
     13D (Amendment No. 1), dated as of February 17, 1998, filed by Daniel A. 
     Whalen.  Also includes 3,906 shares issuable with respect to stock options 
     exercisable within 60 days after September 1, 1998.
(4)  All information regarding share ownership is taken from and furnished in
     reliance upon the Schedule 13G (Amendment No. 6), dated as of April 9,
     1998, jointly filed by Pilgrim Baxter & Associates, Ltd., Harold J. Baxter
     and Gary I. Pilgrim.
(5)  Includes 15,255 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.
(6)  Excludes an aggregate of 2,683 shares of Common Stock owned by Mr. Haden's
     wife as to which Mr. Haden disclaims beneficial ownership.  Includes 15,255
     shares issuable with respect to stock options exercisable within 60 days
     after September 1, 1998.
(7)  Includes 3,662 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 11,441 shares issuable with
     respect to stock options exercisable within 60 days after September 1,
     1998.
(8)  Includes 45,898 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.
(9)  Includes 16,048 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.  Additionally, Dr. Faust's minor
     children own an aggregate of 2,197 shares of Common Stock as to which Dr.
     Faust disclaims beneficial ownership.
(10) Includes 55,176 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.
(11) Includes 257,821 shares issuable with respect to stock options exercisable
     within 60 days after September 1, 1998.



          All Selling Stockholders are employees of MPS, and no Selling 
Stockholder has had any material relationship with the Company, or any of its 
predecessors or affiliates.  Because the Selling Stockholders may sell all or 
part of their shares of Common Stock offered hereby, no estimate can be given 
as to the number of shares of Common Stock that will be held by any Selling 
Stockholder upon termination of any offering made hereby.



                                      11
<PAGE>

                                 PLAN OF DISTRIBUTION


     The Company is registering the Shares on behalf of the Selling
Stockholders.  As used herein, "Selling Stockholders" includes donees and
pledgees selling shares received from a named Selling Shareholder after the date
of this Prospectus.  All costs, expenses and fees in connection with the
registration of the Shares offered hereby will be borne by the Company.
Brokerage commissions and similar selling expenses, if any attributable to the
sale of Shares will be borne by the Selling Stockholders.  Sales of Shares may
be effected by Selling Stockholders from time to time in one or more types of
transactions (which may include block transactions) on the Nasdaq National
Market, in the over-the-counter market, in negotiated transactions, through put
or call options transactions relating to the Shares, through short sales of
Shares, or a combination of such methods of sale, at market prices prevailing at
the time of sale, or at negotiated prices.  Such transactions may or may not
involve brokers or dealers.



     In addition, the Selling Stockholders may enter into hedging transactions
with broker-dealers or other financial institutions.  In connection with such
transactions, broker-dealers or other financial institutions may engage in short
sales of the Company's Common Stock in the course of hedging the positions they
assume with Selling Stockholders.  The Selling Stockholders may also enter into
options or other transactions with broker-dealers or other financial
institutions, which require the delivery to such broker-dealer or other
financial institution of the Shares offered hereby, which Shares such
broker-dealer or other financial institution may resell pursuant to this
Prospectus (as supplemented or amended to reflect such transaction).



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



     The Selling Stockholders may effect such transactions by selling Shares
directly to purchasers or to or through broker-dealers, which may act as agents
or principals.  Such broker-dealers may receive compensation in the form of
discounts, concessions or commissions from the Selling Stockholders and/or the
purchasers of Shares for whom such broker-dealers may act as agents or to whom
they sell as principal, or both (which compensation as to a particular
broker-dealer might be in excess of customary commissions).



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



     Because the Selling Stockholders may be deemed to be "underwriters" within
the meaning of Section 2(11) of the Securities Act, the Selling Stockholders
will be subject to the prospectus delivery requirements of the Securities Act.
The Company has informed the Selling Stockholders that the anti-manipulative
provisions of Regulation M promulgated under the Exchange Act may apply to their
sales in the market.



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



     Upon the Company being notified by a Selling Stockholder that any 
material arrangement has been entered into with a broker-dealer for the sale 
of Shares through a block trade, special offering, exchange

                                      12

<PAGE>

distribution or secondary distribution or a purchase by a broker or dealer, a 
supplement to this Prospectus will be filed, if required, pursuant to Rule 
424(b) under the Securities Act, disclosing (i) the name of each such Selling 
Stockholder and of the participating broker-dealer(s), (ii) the number of 
Shares involved, (iii) the price at which such Shares were sold, (iv) the 
commissions paid or discounts or concessions allowed to such 
broker-dealer(s), where applicable, (v) that such broker-dealer(s) did not 
conduct any investigation to verify the information set out or incorporated 
by reference in this Prospectus and (vi) other facts material to the 
transaction.  In addition, upon the Company being notified by a Selling 
Stockholder that a donee or pledgee intends to sell more than 500 Shares, a 
supplement to this Prospectus will be filed. 

                                    LEGAL MATTERS

     The validity of the Common Stock in respect of which this Prospectus is
being delivered will be passed on for the Company by Riordan & McKinzie, a
Professional Corporation, Los Angeles, California.

                                      13

<PAGE>
                                       
                                    EXPERTS

     The financial statements and the related financial statement schedule 
incorporated in this Prospectus by reference from the Company's Annual Report 
on Form 10-K for the year ended September 28, 1997 have been audited by 
Deloitte & Touche LLP, independent auditors, as stated in their reports, 
which are incorporated herein by reference, and have been so incorporated in 
reliance upon the reports of such firm given upon their authority as experts 
in accounting and auditing.

     The financial statements of NUS Environmental for the year ended 
December 31, 1997 incorporated in this Prospectus by reference from the 
Company's Current Report on Form 8-K/A dated December 31, 1997 have been 
audited by Deloitte & Touche LLP, independent auditors, as stated in their 
report, which is incorporated herein by reference, and has been so 
incorporated in reliance upon the report of such firm given their authority 
as experts in accounting and auditing.

                                       14



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