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EXHIBIT 10.4    
  

 
 

THIRD AMENDMENT    
  

        THIS THIRD AMENDMENT (this "Amendment") dated as of February 28, 2002 is to the Credit Agreement (the
"Credit Agreement") dated as of March 17, 2000 among TETRA TECH, INC. (the "Company"),
various financial institutions and BANK OF AMERICA, N.A., as administrative agent (the "Agent"). Unless otherwise defined herein, terms defined in the
Credit Agreement are used herein as defined therein. 

        WHEREAS,
the parties hereto have entered into the Credit Agreement which provides for the Banks to make Loans to, and to issue Letters of Credit for the account of, the Company from time
to time; and 

        WHEREAS,
the parties hereto desire to amend the Credit Agreement as set forth below; 

        NOW
THEREFORE, in consideration of the premises and for other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged), the parties hereto agree as
follows: 

        SECTION
1    AMENDMENT.    Effective on (and subject to the occurrence of) the Amendment
Effective Date (as defined below), Section 10.12 of the Credit Agreement shall be amended in its entirety to read as follows: 

        10.12    Asset Dispositions.    Not, and not permit any Subsidiary to, sell, transfer, convey, lease or otherwise
dispose of, or grant options, warrants or other rights with respect to, any of its assets, or sell, assign, pledge or otherwise transfer any receivables, contract rights, general intangibles, chattel
paper or
instruments, with or without recourse, except for (a) dispositions of inventory or obsolete assets in the ordinary course of business consistent with past practices and (b) other
dispositions of assets having an aggregate fair market value not exceeding $5,000,000 during the period from the Effective Date to the Termination Date,  provided that no dispostion described in this
clause (b) shall be made if an Event of Default or
Unmatured Event of Default exists or would result therefrom. 

        SECTION
2    REPRESENTATIONS AND WARRANTIES.    The Company represents and warrants to the
Agent and the Banks that (a) each warranty set forth in Section 9 of the Credit Agreement is true and correct as if made on the date hereof, (b) the execution and delivery by the
Company of this Amendment and the performance by the Company of its obligations under the Credit Agreement as amended hereby (as so amended, the "Amended Credit
Agreement") (i) are within the corporate powers of the Company, (ii) have been duly authorized by all necessary corporate action, (iii) have received all
necessary governmental approval and (iv) do not and will not contravene or conflict with any provision of law or of the charter or by-laws of the Company or any Subsidiary or of any
indenture, loan agreement or other material contract, or any judgment, order or decree, which is binding upon the Company or any Subsidiary, and (c) this Amendment and the Amended Credit
Agreement are the legal, valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as enforceability may be limited by bankruptcy, insolvency
or other similar laws of general application affecting the enforcement of creditor's rights or by general principles of equity. 

        SECTION
3    EFFECTIVENESS.    The amendment set forth in  Section 1 shall become effective,
as of the day and year first above written, on such date (the "Amendment Effective
Date") that the Agent shall have received each of the following: (a) counterparts of this Amendment executed by the Company and the Required Banks; (b) a
Confirmation in the form of Exhibit A hereto signed by the Company and each Subsidiary; and (c) such other documents as the Agent or any
Bank may reasonably request. 

1

 

        SECTION
4    MISCELLANEOUS. 

        Section 4.1    Continuing Effectiveness, etc.    As herein amended, the Credit
Agreement shall remain in full force and effect and is hereby ratified and confirmed in all respects. 

        Section 4.2    Counterparts.    This Amendment may be executed in any number of
counterparts and by the different parties on separate counterparts, and each such counterpart shall be deemed to be an original but all such counterparts shall together constitute one and the same
Amendment. 

        Section 4.3    Governing Law.    This Amendment shall be a contract made under and
governed by the laws of the State of Illinois applicable to contracts made and to be performed entirely within such State. 

        Section 4.4    Successors and Assigns.    This Amendment shall be binding upon the
Company and the Agent and their respective successors and assigns, and shall inure to the benefit of the Company and the Agent and the successors and assigns of the Agent. 

        Section 4.5    Expenses.    The Company agrees to pay the reasonable costs and expenses
of the Agent (including attorneys' fees) in connection with the preparation, execution and delivery of this Amendment. 

        Delivered
at Chicago, Illinois, as of the day and year first above written. 

	 	 	TETRA TECH, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Name Printed: Richard A. Lemmon

Title: Executive Vice President
	 	 	 	 	 
	

 	
 	

BANK OF AMERICA, N.A., as

Administrative Agent
	

 	
 	

By:	
 	

/s/  KRISTINE THENNES      

	 	 	Name Printed: Kristine Thennes

Title: Vice President
	 	 	 	 	 
	

 	
 	

BANK OF AMERICA, N.A., as Swing Line Bank, Issuing and as a Bank
	

 	
 	

By:	
 	

/s/  JENNIFER L. GERDES      

	 	 	Name Printed: Jennifer L. Gerdes

Title: Vice President
	 	 	 	 	 

2

 

	

 	
 	

WELLS FARGO BANK, N.A.,

as Documentation Agent
	

 	
 	

By:	
 	

/s/  RANDALL J. REPP      

	 	 	Name Printed: Randall J. Repp

Title: Vice President
	 	 	 	 	 
	

 	
 	

HARRIS TRUST AND SAVINGS BANK,

as Syndication Agent and as a Bank
	

 	
 	

By:	
 	

 
	 	 	 	 	

	 	 	Title:	 	 
	 	 	 	 	

	 	 	 	 	 
	

 	
 	

THE FUJI BANK, LIMITED
	

 	
 	

By:	
 	

 
	 	 	 	 	

	 	 	Title:	 	 
	 	 	 	 	

	 	 	 	 	 
	

 	
 	

U.S. BANK, NATIONAL ASSOCIATION

(formerly known as Pacific Century Bank, N.A.)
	

 	
 	

By:	
 	

/s/  JOHN C. STIPANOV      

	 	 	Name Printed: John C. Stipanov

Title: Vice President

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EXHIBIT A    

CONFIRMATION  

Dated as of February 28, 2002 

        Each
of the undersigned hereby acknowledges and agrees to the foregoing Amendment and the Amended Credit Agreement and hereby confirms the continuing validity and enforceability of the
Guaranty and the Security Agreement after giving effect thereto. 

	 	 	SCM CONSULTANTS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	 
	 	 	 	 	Secretary

	 	 	 	 	 
	

 	
 	

TETRA TECH EM, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

WHALEN & COMPANY, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

TETRA TECH NUS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 

4

 

	

 	
 	

MFG, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

DEA CONSTRUCTION COMPANY, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

UTILITIES & C.C., INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

COSENTINI ASSOCIATES, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

EVERGREEN UTILITY CONTRACTORS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 

5

 

	

 	
 	

KCM, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

LC OF ILLINOIS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

MCNAMEE, PORTER & SEELEY, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

MCNAMEE INDUSTRIAL SERVICES, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

PDR ENGINEERS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 

6

 

	

 	
 	

GEOTRANS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

FHC, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

RIZZO ASSOCIATES, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

ROCKY MOUNTAIN CONSULTANTS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

WILLIAMS, HATFIELD & STONER, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

EXPERT WIRELESS SOLUTIONS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	 	 	 	 	 
	

 	
 	

DRAKE CONTRACTORS, INC.
	

 	
 	

By:	
 	

/s/  RICHARD A. LEMMON      

	 	 	Title:	 	Secretary

	
	 	 	 	 

7

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EXHIBIT 10.4

THIRD AMENDMENT

EXHIBIT AQuickLinks
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EXHIBIT 10.30    
  

 
  REGISTRATION RIGHTS AGREEMENT    
  

        This Registration Rights Agreement (the "Agreement") is entered into as of March 25, 2002 by and among Tetra Tech, Inc., a Delaware corporation
("Tetra Tech"), and the parties listed on Schedule A attached hereto (each, a "Holder" and collectively, the "Holders"). 

R E C I T A L S  

        A.    Tetra
Tech and the Holders are parties to the Securities Purchase and Merger Agreement of even date (the "Purchase Agreement") pursuant to which, among other things, The
Thomas Group Acquisition Corporation, a Delaware corporation and wholly-owned subsidiary of Tetra Tech, will acquire certain limited liability company interests and shares of capital stock from the
Holders. 

        B.    Pursuant
to the Purchase Agreement, the Holders will receive shares of the common stock, $.01 par value, of Tetra Tech ("Tetra Tech Common Stock"); and 

        C.    This
Agreement is the Registration Rights Agreement referred to in Section 6.2 of the Purchase Agreement and,
pursuant thereto, must be entered into by the parties in connection with the consummation of the transactions contemplated by the Purchase Agreement. 

A G R E E M E N T  

        NOW, THEREFORE, in consideration of the mutual covenants and agreements contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

        1.    Certain Definitions.  As used in this Agreement, the following terms shall have the following respective
meanings: 

        "Exchange Act"  shall mean the Securities Exchange Act of 1934, as amended from time to time. 

        "Form S-3"  shall mean such form under the Securities Act as in effect on the date hereof or
any successor registration form under the Securities Act subsequently adopted by the SEC that permits inclusion or incorporation of substantial information by reference to other documents filed by
Tetra Tech with the SEC. 

        "Prospectus"  shall mean the prospectus included in any Registration Statement, as amended or supplemented by
any prospectus supplement, with respect to the terms of the offering of any portion of the Registrable Securities covered by the Registration Statement and by all other amendments and supplements to
the prospectus, including post-effective amendments and all material incorporated by reference in such Prospectus. 

        "Register", "registered" and
"registration"  shall mean and refer to a registration effected by preparing and filing a Registration Statement and taking
all other actions that are necessary or appropriate in connection therewith, and the declaration or ordering of effectiveness of such Registration Statement by the SEC. 

        "Registration Expenses"  shall have the meaning set forth in  Section 4. 

        "Registrable Securities"  shall mean the shares of Tetra Tech Common Stock (i) issued pursuant to the
Purchase Agreement, and (ii) issued as a dividend or other distribution with respect to or in exchange for or in replacement of the shares referenced in (i) above;  provided, however, that
Registrable Securities shall not include any shares of Tetra Tech Common Stock that have previously been registered or sold to
the public or have been sold pursuant to Rule 144 (or similar successor Rule) after the date of this Agreement. 

 

        "Registration Statement"  shall mean any registration statement of Tetra Tech in compliance with the Securities
Act that covers Registrable Securities pursuant to the provisions of this Agreement, including, without limitation, the Prospectus, all amendments and supplements to such Registration Statement,
including all post-effective amendments, all exhibits and all material incorporated by reference in such Registration Statement. 

        "Rule 144"  shall mean Rule 144 promulgated under the Securities Act or any similar successor
rule, as the same shall be in effect from time to time. 

        "Rule 144A"  shall mean Rule 144A promulgated under the Securities Act or any similar successor
rule, as the same shall be in effect from time to time. 

        "Rule 415"  shall mean Rule 415 promulgated under the Securities Act, or any similar successor
rule, as the same shall be in effect from time to time. 

        "Securities Act"  shall mean the Securities Act of 1933, as amended from time to time. 

        "SEC"  shall mean the Securities and Exchange Commission. 

        "Underwritten offering"  shall mean a registration in which securities of Tetra Tech are sold to an underwriter
or through an underwriter as agent for reoffering to the public. 

        2.    Registration for Holders. 

        (a)    Tetra
Tech, at it own expense, shall file a Registration Statement on Form S-3 (or another appropriate Form selected by Tetra
Tech permitting registration of the Registrable Securities by the Holders), providing for the sale by the Holders, pursuant to Rule 415 and/or any similar rule that may be adopted by the SEC,
of the Registrable Securities. Tetra Tech shall file such Registration Statement with the SEC on or before April 4, 2002, and shall keep such Registration Statement continuously effective for a
period ending on the date on which all such Holders are eligible to sell Registrable Securities under Rule 144(k) (or similar successor rule) without any volume limitation. Tetra Tech
represents and warrants that it is currently eligible to file a Registration Statement on Form S-3. 

        (b)    No
Holder shall have the right to register securities under this Agreement unless such Holder provides and/or confirms in writing prior to or after the
filing of the Registration Statement such information (including, without limitation, information as to the number of Registrable Securities that such Holder has sold pursuant to any such Registration
Statement from time to time) as Tetra Tech reasonably requests in connection with such Registration Statement. 

        3.    Registration Procedures. In connection with Tetra Tech's registration obligations pursuant to  Section 2 hereof, Tetra Tech will use commercially reasonable efforts
to effect such registration to permit the sale of the Registrable
Securities covered thereby in accordance with the intended method or methods of disposition thereof, and pursuant thereto Tetra Tech will: 

        (a)    prepare
and file with the SEC a Registration Statement with respect to such Registrable Securities and use commercially reasonable efforts to cause such
Registration Statement to become effective; provided that, before filing any Registration Statement or Prospectus or any amendments or supplements
thereto, Tetra Tech will furnish to the Holders of the Registrable Securities covered by such Registration Statement and their counsel, copies of all such documents proposed to be filed at least two
days prior thereto, and Tetra Tech will not file any such Registration Statement or amendment thereto or any Prospectus or any supplement thereto to which any such Holder shall reasonably object
within such two day period; provided, further, that Tetra Tech will not name or otherwise provide any
information with respect to any Holder in any Registration Statement or Prospectus without the express written consent of such Holder, unless required to do so by the Securities Act and the rules and
regulations thereunder; 

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        (b)    prepare
and file with the SEC such amendments, post-effective amendments and supplements to the Registration Statement and the Prospectus as
may be necessary to comply with the provisions of the Securities Act and the rules and regulations thereunder with respect to the disposition of all securities covered by such Registration Statement; 

        (c)    notify
the selling Holders (i) when the Prospectus or any Prospectus supplement or post-effective amendment has been filed, and, with
respect to the Registration Statement or any post-effective amendment, when the same has become effective, (ii) of any request by the SEC for amendments or
supplements to the Registration Statement or the Prospectus or for additional information, (iii) of the issuance by the SEC of any stop order suspending the effectiveness of the Registration
Statement or the initiation of any proceedings for that purpose, (iv) of the receipt by Tetra Tech of any notification with respect to the suspension of the qualification of the Registrable
Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose, and (v) of the happening of any event which makes any statement made in the
Registration Statement, the Prospectus or any document incorporated therein by reference untrue or which requires the making of any changes in the Registration Statement, the Prospectus or any
document incorporated therein by reference in order to make the statements therein not misleading in light of the circumstances then existing; 

        (d)    use
commercially reasonable efforts to obtain the withdrawal of any order suspending the effectiveness of the Registration Statement at the earliest
possible date; 

        (e)    deliver
to each selling Holder, without charge, such reasonable number of conformed copies of the Registration Statement (and any
post-effective amendment thereto) and such number of copies of the Prospectus (including each preliminary prospectus) and any amendment or supplement thereto (and any documents
incorporated by reference therein) as such Holder may reasonably request. Tetra Tech consents to the use of the Prospectus or any amendment or supplement thereto by each of the selling Holders in
connection with the offer and sale of the Registrable Securities covered by the Prospectus or any amendment or supplement thereto; 

        (f)      prior
to any offering of Registrable Securities covered by a Registration Statement, register or qualify or cooperate with the selling Holders in
connection with the registration or qualification of such Registrable Securities for offer and sale under the securities or blue sky laws of such jurisdictions as any such selling Holder reasonably
requests, and use commercially reasonable efforts to keep each such registration or qualification effective, including through new filings, or amendments or renewals, during the period such
Registration Statement is required to be kept effective pursuant to the terms of this Agreement; and do any and all other acts or things necessary or advisable to enable the disposition in all such
jurisdictions reasonably requested by the Holders of the Registrable Securities covered by such Registration Statement, provided that under no
circumstances shall Tetra Tech be required in connection therewith or as a condition thereof to qualify to do business or to file a general consent to service of process in any such states or
jurisdictions; 

        (g)    cooperate
with the selling Holders to facilitate the timely preparation and delivery of certificates representing Registrable Securities to be sold, free
of any and all restrictive legends, such certificates to be in such denominations and registered in such names as the Holders may request; 

        (h)    upon
the occurrence of any event contemplated by Section 3(c)(v) above, prepare a supplement or
post-effective amendment to the Registration Statement or the Prospectus or any document incorporated therein by reference or file any other required document so that, as thereafter
delivered to the purchasers of the Registrable Securities, the Prospectus will not contain an untrue statement of a material fact or omit to state any material fact necessary to make the statements
therein, in light of the circumstances under which they were made, not misleading; 

3

 

        (i)      make
generally available to the holders of Tetra Tech's outstanding securities earnings statements satisfying the provisions of Section 11(a) of the
Securities Act, no later than 60 days after the end of any 12 month period (or 90 days, if such period is a fiscal year) beginning with the first month of Tetra Tech's first
fiscal quarter commencing after the effective date of the Registration Statement, which statements shall cover said 12 month period; 

        (j)      provide
and cause to be maintained a transfer agent and registrar for all Registrable Securities covered by each Registration Statement from and after a
date not later than the effective date of such Registration Statement; and 

        (k)    authorize
for quotation on the National Market of the National Association of Securities Dealers Automated Quotation System ("Nasdaq") the Registrable
Securities. 

        Each
Holder agrees that, upon receipt of any notice from Tetra Tech of the happening of any event of the kind described in  Section 3(c)(v) hereof, such Holder will forthwith discontinue disposition of
Registrable Securities under the Prospectus related to the
applicable Registration Statement until such Holder's receipt of the copies of the supplemented or amended Prospectus contemplated by  Section 3(h) hereof, or until it is advised in writing by Tetra
Tech that the use of the Prospectus may be resumed. 

        It
shall be a condition precedent to the obligations of Tetra Tech to take any action pursuant to this Section 3 with respect to
the Registrable Securities of any selling Holder that such Holder shall furnish to Tetra Tech such information regarding itself and the Registrable Securities held by it as shall be required by the
Securities Act to effect the registration of such Holder's Registrable Securities. 

        4.    Registration Expenses. All expenses incident to any registration to be effected hereunder and incident to Tetra Tech's
performance of or compliance with this Agreement, including without limitation all registration and filing fees, fees and expenses of compliance with securities or blue sky laws, printing expenses,
messenger and delivery expenses, National Association of Securities Dealers, Inc., stock exchange and qualification fees, fees and disbursements of Tetra Tech's counsel and of independent
certified public accountants of Tetra Tech (including the expenses of any special audit required by or incident to such performance), the fees and disbursements of one counsel and one accountant
representing the Holders in such offering, expenses of the underwriters that are customarily requested in similar circumstances by such underwriters (excluding discounts, commissions or fees of
underwriters, selling brokers, dealer managers or similar securities industry professionals relating to the distribution of the Registrable Securities, which will be borne by the Holders), all such
expenses being herein called "Registration Expenses," will be borne by Tetra Tech. Tetra Tech will also pay its internal expenses, the expense of any annual audit and the fees and expenses of any
person retained by Tetra Tech. 

        5.    Indemnification. 

        (a)    Indemnification by Tetra Tech. Tetra Tech agrees to indemnify and hold harmless each Holder of Registrable
Securities, its officers, directors, partners and employees and each person who controls such Holder (within the meaning of Section 15 of the Securities Act) from and against any and all
losses, claims, damages and liabilities (including any investigation, legal or other expenses reasonably incurred in connection with, and any amount paid in settlement of, any action, suit or
proceeding or any claim asserted) (collectively, "Damages") to which such Holder may become subject under the Securities Act, the Exchange Act or other federal or state securities law or regulation,
at common law or otherwise, insofar as such Damages arise out of or are based upon (i) any untrue statement or alleged untrue statement of a material fact contained in any Registration
Statement, Prospectus or preliminary prospectus or any amendment or supplement thereto, (ii) the omission or alleged omission to state therein a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under which they were made, not misleading and (iii) any violation or alleged violation by Tetra Tech of the Securities
Act, the Exchange Act or any state 

4

 

securities or blue sky laws in connection with the Registration Statement, Prospectus or preliminary prospectus or any amendment or supplement thereto,  provided that Tetra Tech will not be liable to any
Holder to the extent that such Damages arise from or are based upon any untrue statement or omission
(x) based upon written information furnished to Tetra Tech by such Holder expressly for the inclusion in such Registration Statement, (y) made in any preliminary prospectus if such
Holder failed to deliver a copy of the Prospectus with or prior to the delivery of written confirmation of the sale by such Holder to the party asserting the claim underlying such Damages and such
Prospectus would have corrected such untrue statement or omission and (z) made in any Prospectus if such untrue statement or omission was corrected in an amendment or supplement to such
Prospectus and such Holder failed to deliver such amendment or supplement prior to or concurrently with the sale of Registrable Securities to the party asserting the claim underlying such Damages. 

        (b)    Indemnification by Holders of Registrable Securities. Each Holder of Registrable Securities whose
Registrable Securities are sold under a Prospectus which is a part of a Registration Statement agrees to indemnify and hold harmless Tetra Tech, its directors and each officer who signed such
Registration Statement and each person who controls Tetra Tech (within the meaning of Section 15 of the Securities Act), and each other Holder of Registrable Securities whose Registrable
Securities are sold under the Prospectus which is a part of such Registration Statement (and such Holder's officers, directors and employees and each person who controls such Holder within the meaning
of Section 15 of the Securities Act), under the same circumstances as the foregoing indemnity from Tetra Tech to each Holder of Registrable Securities to the extent that such losses, claims,
damages, liabilities or actions arise out of or are based upon any untrue statement of a material fact or omission of a material fact that was made in the Prospectus, the Registration Statement, or
any amendment or supplement thereto, in reliance upon and in conformity with information relating to such Holder furnished in writing to Tetra Tech by such Holder expressly for use therein,  provided
that in no event shall the aggregate liability of any selling Holder of Registrable Securities exceed the amount of the net proceeds received
by such Holder upon the sale of the Registrable Securities giving rise to such indemnification obligation. Tetra Tech and the selling Holders shall be entitled to receive indemnities from
underwriters, selling brokers, dealer managers and similar securities industry professionals participating in the distribution, to the same extent as customarily furnished by such persons in similar
circumstances. 

        (c)    Conduct of Indemnification Proceedings. Any person entitled to indemnification hereunder will
(i) give prompt notice to the indemnifying party of any claim with respect to which it seeks indemnification and (ii) permit such indemnifying party to assume the defense of such claim
with counsel reasonably satisfactory to the indemnified party; provided, however, that any person
entitled to indemnification hereunder shall have the right to employ separate counsel and to participate in the defense of such claim, but the fees and expenses of such counsel shall be at the expense
of such person and not of the indemnifying party unless (A) the indemnifying party has agreed to pay such fees or expenses, (B) the indemnifying party shall have failed to assume the
defense of such claim and employ counsel reasonably satisfactory to such person or (C) in the reasonable judgment of such person and the indemnifying party, based upon advice of their
respective counsel, a conflict of interest may exist between such person and the indemnifying party with respect to such claims (in which case, if the person notifies the indemnifying party in writing
that such person elects to employ separate counsel at the expense of the indemnifying party, the indemnifying party shall not have the right to assume the defense of such claim on behalf of such
person). If such defense is not assumed by the indemnifying party, the indemnifying party will not be subject to any liability for any settlement made without its consent (but such consent will not be
unreasonably withheld). No indemnified party will be required to consent to entry of any judgment or enter into any settlement which does not include as an unconditional term thereof the giving by all
claimants or plaintiffs to such indemnified party of a release from all liability in respect to such claim or litigation. Any indemnifying party who is not entitled to, or elects not to, assume the
defense of a claim will not be obligated to pay the fees and 

5

 

expenses of more than one counsel for all parties indemnified by such indemnifying party with respect to such claim. As used in this  Section 5(c), the terms "indemnifying party", "indemnified
party" and other terms of similar import are intended to include only Tetra Tech (and
its officers, directors and control persons as set forth above) on the one hand, and the Holders (and their officers, directors, partners, employees, attorneys and control persons as set forth above)
on the other hand, as applicable. 

        (d)    Contribution. If for any reason the foregoing indemnity is unavailable, then the indemnifying party shall
contribute to the amount paid or payable by the indemnified party as a result of such losses, claims, damages, liabilities or expenses in such proportion as is appropriate to reflect the relative
fault of the indemnifying party and the indemnified party in connection with the statements or omissions which resulted in such losses, claims, damages, liabilities or expenses, as well as any other
relevant equitable considerations. The relative fault of such indemnifying party and indemnified party shall be determined by reference to, among other things, whether the untrue statement or alleged
untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by such indemnifying party or by such indemnified party, and the parties'
relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The parties acknowledge and agree that it would not be just and equitable if
contribution pursuant to this Section 5(d) were determined by pro rata allocation or by any other method of allocation that does not take into
account the equitable considerations referred to in this Section 5(d). Notwithstanding the foregoing, no Holder shall be required to contribute
any amount in excess of the amount such Holder would have been required to pay to an indemnified party if the indemnity under Section 5(b) hereof
was available. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty
of such fraudulent misrepresentation. The obligation of any person to contribute pursuant to this Section 5(d) shall be several and not joint. 

        (e)    Timing of Payments. An indemnifying party shall make payments of all amounts required to be made pursuant
to the foregoing provisions of this Section 5 to or for the account of the indemnified party from time to time promptly upon receipt of bills or
invoices relating thereto or when otherwise due or payable. 

        (f)      Survival. The indemnity and contribution agreements contained in this  Section 5 shall remain in full force and effect, regardless of any investigation made by or
on behalf of Tetra Tech, a participating Holder, its
officers, directors, partners, attorneys, agents or any person, if any, who controls Tetra Tech or such Holder as aforesaid, and shall survive the transfer of such Registrable Securities by such
Holder. 

        6.    Preparation; Reasonable Investigation. In connection with the preparation and filing of a Registration Statement pursuant
to the terms of this Agreement: 

        (a)    Tetra
Tech shall, with respect to a Registration Statement filed pursuant to Section 2, give the
Holders of such Registrable Securities so registered, their underwriters, if any, and their respective counsel and accountants the opportunity to participate in the preparation of such Registration
Statement (other than reports and proxy statements incorporated therein by reference and properly filed with the SEC) and each Prospectus included therein or filed with the SEC, and each amendment
thereof or supplement thereto; and 

        (b)    Tetra
Tech shall give the Holders of such Registrable Securities so registered, their underwriters, if any, and their respective counsel and accountants
such reasonable access to its books and records and such opportunities to discuss the business of Tetra Tech with its officers and the independent public accountants who have certified its financial
statements as shall be necessary, in the opinion of such Holders or such underwriters, to conduct a reasonable investigation within the meaning of Section 11(b)(3) of the Securities Act. 

6

 

        7.    Rule 144. Tetra Tech covenants that it will use commercially reasonable efforts to file, on a timely basis, the
reports required to be filed by it under the Securities Act and the Exchange Act and the rules and regulations adopted by the SEC thereunder, and it will take such further action as any Holder may
reasonably request (including, without limitation, compliance with the current public information requirements of Rule 144(c) and Rule 144A), all to the extent required from time to time
to enable such Holder to sell Registrable Securities without registration under the Securities Act within the limitation of the conditions provided by Rule 144, Rule 144A or any similar
rule or regulation hereafter adopted by the SEC. Upon the request of any Holder, Tetra Tech will promptly deliver to such Holder a written statement verifying that it has complied with such
information and requirements. 

        8.    Specific Performance. Each Holder, in addition to being entitled to exercise all rights provided herein or granted by law,
including recovery of damages, will be entitled to specific performance of its rights under this Agreement. Tetra Tech agrees that monetary damages would not be adequate compensation for any loss
incurred by reason of a breach by it of the provisions of this Agreement and hereby agrees to waive the defense in any action for specific performance that a remedy at law would be adequate. 

        9.    Notices. All notices and other communications required or permitted hereunder shall be in writing and shall be mailed by
United States first-class mail, postage prepaid, sent by facsimile or delivered personally by hand or nationally recognized courier addressed (a) if to a Holder, as indicated on the list of
Holders attached hereto as Schedule A, or at such other address as such Holder or permitted assignee shall have furnished to Tetra Tech in
writing, or (b) if to Tetra Tech, at such address or facsimile number as Tetra Tech shall have furnished to each Holder in writing. All such notices and other written communications shall be
effective on the date of mailing, facsimile transfer or delivery. 

        10.  Assignment of Rights. The rights and benefits of a Holder hereunder may not be assigned to a transferee or assignee
without the consent of Tetra Tech which consent shall not be unreasonably withheld. 

        11.  Severability. In the event that any one or more of the provisions contained herein, or the application thereof in any
circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining provisions contained herein shall
not be affected or impaired thereby. 

        12.  Entire Agreement; Amendment; Waiver. This Agreement, the Purchase Agreement and the other agreements contemplated thereby
constitute the full and entire understanding and agreement among the parties with regard to the subjects hereof and thereof. Without limiting the foregoing, the rights of the Holders to registration
pursuant to the terms of this Agreement shall be subject to the limitations on resale contained in their respective Investment Letters (as defined in the Purchase Agreement). Neither this Agreement
nor any term hereof may be amended, waived, discharged or terminated, except by a written instrument signed by Tetra Tech and the holders of at least 51% of the Registrable Securities, and any such
amendment, waiver, discharge or termination shall be binding upon all the parties hereto. Notwithstanding the foregoing, in no event shall the obligation of any party hereto be materially increased,
except upon the written consent of such party. 

        13.  Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be original, and all of
which together shall constitute one instrument. 

        14.  Governing Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York
without giving effect to principles of conflicts of laws thereof. 

        15.  No Third Party Beneficiaries. The covenants and agreements set forth herein are for the sole and exclusive benefit of the
parties hereto and their respective successors and assigns and such covenants and agreements shall not be construed as conferring, and are not intended to confer, any rights or benefits upon any other
persons. 

7

 

        IN
WITNESS WHEREOF, the parties hereto have executed this Agreement as of the day and year first above written. 

	 	 	TETRA TECH, INC.
	

 	
 	

By:	
 	

/s/  LI-SAN HWANG      
 Li-San Hwang

Chairman and Chief Executive Officer
	 	 	 	 	 
	

 	
 	

/s/  JAMES LOVEALL      
 James Loveall
	 	 	 	 	 
	

 	
 	

/s/  MICHAEL SCHWARTZ      
 Michael Schwartz
	 	 	 	 	 
	

 	
 	

/s/  DAVID KUCKUK      
 David Kuckuk
	 	 	 	 	 
	

 	
 	

/s/  WILLIAM WISBAUER      
 William Wisbauer
	 	 	 	 	 
	

 	
 	

/s/  DAVID L. ELWYN      
 David L. Elwyn
	 	 	 	 	 
	

 	
 	

/s/  SCOTT HUGHES      
 Scott Hughes
	 	 	 	 	 
	

 	
 	

/s/  DAVID LINES      
 David Lines
	 	 	 	 	 

8

 

	

 	
 	

/s/  WILLIAM G. HAYES      
 William G. Hayes
	 	 	 	 	 
	

 	
 	

/s/  GEOFREY WETZLER      
 Geofrey Wetzler
	 	 	 	 	 
	

 	
 	

/s/  THOMAS TOWNES      
 Thomas Townes
	 	 	 	 	 
	

 	
 	

/s/  CYNTHIA NICHOLSON      
 Cynthia Nicholson
	 	 	 	 	 
	

 	
 	

/s/  ANTHONY GLASER      
 Anthony Glaser
	 	 	 	 	 
	

 	
 	

/s/  DANIEL BALTO      
 Daniel Balto

9

  

 
 

SCHEDULE A    
  

 
 

SCHEDULE OF HOLDERS    
  

	Holder's Name/Address/Facsimile No.
 
	 	Number of Shares of Tetra Tech Common

Stock Issued Pursuant

to the Purchase Agreement

	James Loveall

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	 	48,897
	

Michael Schwartz

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

48,897
	

David Kuckuk

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

48,897
	

William Wisbauer

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

48,897
	

David L. Elwyn

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

48,897
	

Scott Hughes

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

48,897

10

 

	Holder's Name/Address/Facsimile No.
 
	 	Number of Shares of Tetra Tech Common

Stock Issued Pursuant

to the Purchase Agreement

	David Lines

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	 	43,814
	

William G. Hayes

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155
	

Geofrey Wetzler

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155
	

Thomas Townes

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155
	

Cynthia Nicholson

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155
	

Anthony Glaser

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155
	

Daniel Balto

c/o The Thomas Group

215 The Commons

Ithaca, New York 14850

(607) 277-1420	
 	

9,155

11

QuickLinks

EXHIBIT 10.30

REGISTRATION RIGHTS AGREEMENT

SCHEDULE A

SCHEDULE OF HOLDERS

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