HARDING LAWSON ASSOCIATES GROUP INC
PREM14A, 2000-04-05
ENGINEERING SERVICES
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<PAGE>   1


                                  SCHEDULE 14A
                                 (RULE 14a-101)
                     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 Under Rule 14a-12

                      Harding Lawson Associates Group, Inc.
               --------------------------------------------------
                (Name of Registrant as Specified in Its Charter)

   -------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

         [ ] No fee required.
         [x] 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:
                 Harding Lawson Associates Group, Inc. common stock

             2)  Aggregate number of securities to which transaction applies:
                 5,100,996

             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): Cash merger consideration of $11.50 will be
                 exchanged for each of the 5,100,996 shares of Harding Lawson
                 Associates Group, Inc. common stock. Fee calculated on the
                 basis of 1/50 of 1% of the aggregate merger consideration of
                 $58,661,454.

             4)  Proposed maximum aggregate value of transaction: $58,661,454

             5)  Total fee paid: $11,732.29

         [ ] 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:
                                       --------------
             2) Form, Schedule or Registration Statement No.:
                                                             -------------
             3) Filing Party:
                             ------------------------------------
             4) Date Filed:
                           ------------------------


<PAGE>   2





                  [HARDING LAWSON ASSOCIATES GROUP, INC. LOGO]

                      HARDING LAWSON ASSOCIATES GROUP, INC.
                       707 SEVENTEENTH STREET, SUITE 2400
                                DENVER, CO 80202

                                    ---------

DEAR STOCKHOLDER,

         You are cordially invited to attend a special meeting of the
stockholders of Harding Lawson Associates Group, Inc., which will be held at 707
Seventeenth Street, Suite 2400, Denver, Colorado on Thursday, May 25, 2000, at
9:00 a.m., local time.

         At the special meeting, you will be asked to consider and vote to
approve and adopt a merger agreement under which MACTEC, Inc. would acquire
Harding by merger and you would be entitled to receive $11.50 per share in cash,
unless you properly exercise your appraisal rights.

         Detailed information concerning the merger is set forth in the
accompanying proxy statement and a copy of the merger agreement is attached as
Appendix A to the proxy statement, both of which you are urged to read
carefully.

         THE BOARD OF DIRECTORS, AFTER CAREFUL CONSIDERATION, HAS UNANIMOUSLY
APPROVED THE MERGER AGREEMENT, HAS DECLARED THE MERGER ADVISABLE AND IN THE BEST
INTERESTS OF HARDING AND ITS STOCKHOLDERS AND RECOMMENDS THAT HOLDERS OF COMMON
STOCK VOTE "FOR" APPROVAL AND ADOPTION OF THE MERGER AGREEMENT.

         YOUR VOTE IS IMPORTANT. To assure that your shares are represented at
the special meeting, please complete, sign and date the enclosed proxy card and
return it in the enclosed postage-paid envelope. This will allow your shares to
be represented at the meeting whether or not you attend the meeting.

                                          Sincerely yours,



                                          --------------------------------------
                                          Robert L. Costello, Jr.
                                          Chief Executive Officer





<PAGE>   3



                            HARDING LAWSON ASSOCIATES
                       707 SEVENTEENTH STREET, SUITE 2400
                                DENVER, CO 80202

                                    ---------

                     NOTICE OF SPECIAL STOCKHOLDERS MEETING

                                    ---------

         A special meeting of stockholders of Harding Lawson Associates Group,
Inc., a Delaware corporation, will be held on Thursday, May 25, 2000, at 707
Seventeenth Street, Suite 2400, Denver, Colorado, for the following purposes:

         1. To consider and vote upon a proposal to approve and adopt the
Agreement and Plan of Merger, dated as of March 23, 2000, among Harding Lawson
Associates Group, Inc. ("Harding"), MACTEC, Inc. ("MACTEC") and CETCAM
Acquisition Corporation, a wholly owned subsidiary of MACTEC ("Merger Sub"),
that will result in:

         o        Merger Sub merging with and into Harding, with Harding being
                  the surviving corporation and becoming a wholly-owned
                  subsidiary of MACTEC; and

         o        each outstanding share of Harding common stock held
                  immediately prior to the effective time of the merger, other
                  than shares held by stockholders who are entitled to and who
                  have perfected their appraisal rights, being converted into
                  the right to receive $11.50 in cash, without interest, subject
                  to reduction for applicable withholding or stock transfer
                  taxes.

         2. To transact such other business as may properly come before the
special meeting or any adjournment or postponement of the special meeting,
including without limitation, potential adjournments or postponements of the
special meeting for the purpose of soliciting additional proxies in order to
approve and adopt the merger agreement.

         Only those stockholders of record at the close of business on April 20,
2000 will be entitled to notice of and to vote at the meeting or any adjournment
or postponement thereof. A list of stockholders entitled to vote at the special
meeting will be available during ordinary business hours at Harding's offices at
707 Seventeenth Street, Suite 2400, Denver, Colorado for a period of at least 10
days prior to the special meeting for examination by any Harding stockholder
entitled to vote at the special meeting. Your attention is directed to the proxy
statement accompanying this notice for a more complete statement regarding the
matters proposed to be acted upon at the special meeting. A copy of the merger
agreement is attached as Appendix A to the accompanying proxy statement.

         PLEASE SIGN AND DATE THE ACCOMPANYING PROXY CARD AND RETURN IT IN THE
STAMPED, SELF-ADDRESSED ENVELOPE ENCLOSED FOR YOUR USE.


<PAGE>   4

         PLEASE DO NOT SEND YOUR HARDING COMMON STOCK CERTIFICATES TO HARDING
WITH YOUR PROXY CARDS. IF THE MERGER IS CONSUMMATED, YOU WILL RECEIVE A LETTER
CONTAINING INSTRUCTIONS FOR THE SURRENDER OF YOUR HARDING COMMON STOCK
CERTIFICATES.

                                    By Order of the Board of Directors



                                    Valorie B. Feher
                                    Secretary

April ___, 2000



<PAGE>   5



                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                                 PAGE

<S>                                                                                                            <C>
SUMMARY .........................................................................................................1

         The Companies...........................................................................................3
         Recommendation Of The Board Of Directors................................................................4
         Reasons For Merger (Page 18)............................................................................4
         Opinion Of Harding's Financial Advisor (Page 20)........................................................4
         The Special Meeting (Page 14)...........................................................................4
         Time, Date, Place And Purpose...........................................................................4
         Record Date And Voting Power............................................................................4
         Vote Required...........................................................................................5
         Proxies ................................................................................................5
         The Merger (Page 31)....................................................................................5
         What Holders Of Harding Common Stock Will Receive (Page 31).............................................5
         Effective Time Of The Merger (Page 31)..................................................................5
         Interests Of Certain Persons In The Merger (Page 25)....................................................5
         Conditions To The Merger (Page 37)......................................................................6
         Termination Of The Merger Agreement (Page 39)...........................................................6
         Termination Fees (Page 40)..............................................................................7
         Financing For The Merger (Page 28)......................................................................7
         Accounting Treatment (Page 28)..........................................................................7
         Tax Consequences (Page 29)..............................................................................8
         Regulatory Matters (Page 28)............................................................................8
         Appraisal Rights (Page 41)..............................................................................8

FREQUENTLY ASKED QUESTIONS AND ANSWERS ABOUT THE MERGER..........................................................9


MARKET PRICE OF HARDING COMMON STOCK  AND DIVIDEND HISTORY......................................................12


SELECTED CONSOLIDATED FINANCIAL DATA OF HARDING.................................................................13


THE HARDING SPECIAL MEETING.....................................................................................14

         Time, Place And Date...................................................................................14
         Purpose Of The Special Meeting.........................................................................14
         Record Date, Outstanding Shares And Voting.............................................................14
         Quorum     ............................................................................................14
         Vote Required..........................................................................................14
         Voting Of Proxies......................................................................................15
         Revocation Of Proxies..................................................................................15
         Solicitation Of Proxies................................................................................16

THE MERGER .....................................................................................................17

         Background Of The Merger...............................................................................17
         Harding's Reasons For The Merger.......................................................................18
         Recommendation Of The Board Of Directors Of Harding....................................................20
</TABLE>


                                      -i-

<PAGE>   6

                                TABLE OF CONTENTS

<TABLE>
                                                                                                                 PAGE
<S>                                                                                                            <C>
         Opinion Of Harding's Financial Advisor.................................................................20
                    Selected Companies Analysis.................................................................22
                    Precedent Transactions Analysis.............................................................23
                    Discounted Cash Flow Analysis...............................................................24
                    Premiums Paid Analysis......................................................................24
                    Other Factors...............................................................................24
         Interests Of Directors And Executive Officers In The Merger............................................26
                    Share Ownership.............................................................................26
                    Employment And Severance Arrangements.......................................................26
                    Options.....................................................................................27
                    Non-Qualified Deferred Compensation Plan....................................................27
                    Indemnification And Insurance...............................................................28
         Financing For The Merger...............................................................................28
         Expected Accounting Treatment Of The Merger............................................................28
         Hart-Scott-Rodino Filings..............................................................................29
         Material United States Federal Income Tax Considerations...............................................29
         Delisting And Deregistration Of Harding Common Stock...................................................30

THE MERGER AGREEMENT............................................................................................31

         The Merger.............................................................................................31
         Treatment Of Harding Common Stock......................................................................31
         Procedures For Exchange Of Stock Certificates..........................................................31
         Representations And Warranties.........................................................................32
         Covenants Pending The Merger...........................................................................33
         Conditions To The Merger...............................................................................37
         Termination............................................................................................39
         Termination Fees.......................................................................................40
         Amendment..............................................................................................41
         Extension; Waiver......................................................................................41
         Appraisal Rights.......................................................................................41

INFORMATION CONCERNING Harding..................................................................................45

SECURITY OWNERSHIP OF PRINCIPAL STOCKHOLDERS AND MANAGEMENT OF HARDING..........................................45

INFORMATION CONCERNING MACTEC AND MERGER SUB....................................................................47

STOCKHOLDER PROPOSALS...........................................................................................48

WHERE YOU CAN FIND MORE INFORMATION.............................................................................48

INDEPENDENT AUDITORS............................................................................................49
</TABLE>


                                      -ii-


<PAGE>   7
                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                            <C>

APPENDIX A            AGREEMENT AND PLAN OF MERGER.............................................................A-1
APPENDIX B            OPINION OF CIBC WORLD MARKETS CORP.......................................................B-1
APPENDIX C            SUMMARY OF APPRAISAL RIGHTS..............................................................C-1
</TABLE>



                                     -iii-

<PAGE>   8



                      HARDING LAWSON ASSOCIATES GROUP, INC.
                       707 SEVENTEENTH STREET, SUITE 2400
                                DENVER, CO 80202

                                    ---------

                                 PROXY STATEMENT

                                    ---------


         This Proxy Statement is furnished in connection with the solicitation
by the Board of Directors of Harding Lawson Associates Group, Inc. ("Harding")
of proxies for use at the special meeting of stockholders to be held on
Thursday, May 25, 2000, at 707 Seventeenth Street, Suite 2400, Denver, CO. At
the special meeting, stockholders will be asked to approve the Agreement and
Plan of Merger, dated as of March 23, 1999, among Harding, MACTEC, Inc.
("MACTEC") and CETCAM Acquisition Corporation, a wholly owned subsidiary of
MACTEC ("Merger Sub"). Consummation of the merger will result in:

         o        Merger Sub merging with and into Harding, with Harding as the
                  surviving corporation and a wholly-owned subsidiary of MACTEC;
                  and

         o        each outstanding share of Harding common stock held
                  immediately prior to the effective time of the merger being
                  converted into the right to receive $11.50 in cash, without
                  interest, other than shares held by stockholders who are
                  entitled to and who have perfected their appraisal rights.

         As of April 20, 2000, Harding had 5,100,996 shares of common stock, par
value $.01 per share, outstanding. Only stockholders of record at the close on
business on April 20, 2000, will be entitled to notice of and to vote at the
special meeting. Each stockholder will be entitled to one vote for each share of
common stock outstanding in the stockholder's name on the records of Harding.
Approval of the merger agreement requires the affirmative vote of at least a
majority of the outstanding shares of Harding common stock entitled to vote.

         All proxies duly executed and received will be voted on all business
properly presented at the special meeting. Only such business that is brought
before the special meeting by or at the direction of the Board of Directors will
be conducted at the special meeting. Proxies that specify a vote on a proposal
will be voted in accordance with such specification. Proxies that do not specify
a vote on a proposal will be voted in accordance with the recommendation of the
Board of Directors. The Board of Directors knows of no other business to be
brought before the special meeting. However, if other business is properly
brought before the special meeting, the holders of the proxies will vote on
those proposals at their discretion. A stockholder voting by means of a proxy
has the power to revoke it at any time before it is exercised by submitting
another proxy bearing a later date, by notifying the Secretary of Harding in
writing of such revocation, or by voting in person at the special meeting.

         THE BOARD OF DIRECTORS OF HARDING HAS UNANIMOUSLY APPROVED THE MERGER
AGREEMENT, HAS DECLARED THE MERGER ADVISABLE AND IN THE BEST INTERESTS OF
HARDING AND ITS STOCKHOLDERS, AND RECOMMENDS THAT YOU VOTE "FOR" APPROVAL OF THE
MERGER AGREEMENT AND THE MERGER.




                                      -1-
<PAGE>   9

         Harding will pay the expense of soliciting proxies. Proxies will be
solicited by mail. Proxies may also be solicited by telephone calls or personal
calls by officers, directors, or employees of Harding, none of whom will be
specially compensated for soliciting proxies. Harding has retained the services
of Corporate Investor Communications, Inc., to assist in the solicitation. Fees
for such services are estimated to be approximately $5,000 plus reasonable
out-of-pocket expenses. This proxy statement and the accompanying proxy were
mailed on or about April __, 2000.





                                      -2-
<PAGE>   10


                                     SUMMARY

         This summary highlights selected information from this document and may
not contain all of the information that is important to you. To understand the
proposal for the special meeting fully and for a more complete description of
the legal terms of the merger you should read carefully this entire document and
the documents to which we have referred you. A copy of the merger agreement is
attached as Appendix A to this proxy statement and reference is made thereto for
a complete description of the merger. See "Where You Can Find More Information"
on page 48. We have included page references parenthetically to direct you to a
more complete description of the topics in this summary.

THE COMPANIES

MACTEC, Inc.
1819 Denver West Drive, Suite 400
Golden, CO  80401
(303) 278-3100

         MACTEC, Inc., established in 1975, has evolved into one of the
country's leading environmental professional services organizations providing
major project support and leading-edge technologies. Today it is a provider of
environmental solutions for multiple government and private clients through a
network of over 40 offices nationwide and currently employs nearly 1,000 staff
members.

Harding Lawson Associates Group, Inc.
707 Seventeenth Street, Suite 2400
Denver, CO  80202
(303) 293-6100

         Harding Lawson Associates Group, Inc., headquartered in Denver,
Colorado, provides a broad range of infrastructure engineering, environmental
engineering, consulting and construction-related services to private sector
industrial and public sector governmental clients. The company operates through
a network of nearly 40 offices nationwide and currently employs nearly 1,200
staff members.

CETCAM Acquisition Corporation
1819 Denver West Drive, Suite 400
Golden, CO  80401
(303) 278-3100

         CETCAM Acquisition Corporation is a corporation formed as a subsidiary
of MACTEC to effect the merger. Merger Sub will not have any significant assets
or liabilities or engage in any activities other than those related to
completing the merger.



                                      -3-
<PAGE>   11

RECOMMENDATION OF THE BOARD OF DIRECTORS

         The Harding Board of Directors believes that the merger is advisable
and in your best interests and recommends that you vote FOR the proposal to
approve and adopt the merger agreement.

REASONS FOR MERGER (PAGE 18)

         The Harding Board of Directors believes that the merger will achieve
greater value at this time for Harding stockholders as compared with remaining a
public company and that it is desirable to combine Harding with another
prestigious engineering firm, resulting in a larger company with a substantial
broader base of technical resources. In reaching its determination, the Harding
Board of Directors considered various factors, such as the value to be received
per share of Harding common stock in the merger, the present and anticipated
environment of Harding's business, and the financial condition, results of
operations, business and prospects of Harding.

OPINION OF HARDING'S FINANCIAL ADVISOR (PAGE 20)

         In connection with the merger, the Harding Board of Directors received
an opinion from Harding's financial advisor, CIBC World Markets Corp., as to the
fairness, from a financial point of view, of the merger consideration to the
holders of Harding common stock. CIBC World Markets' written opinion, dated
March 23, 2000, is attached to this proxy statement as Appendix B. We encourage
you to read this opinion carefully in its entirety for a description of the
procedures followed, assumptions made, matters considered and limitations on the
review undertaken by CIBC World Markets in providing its opinion. CIBC WORLD
MARKETS' OPINION IS ADDRESSED TO THE HARDING BOARD OF DIRECTORS AND DOES NOT
CONSTITUTE A RECOMMENDATION TO ANY STOCKHOLDER WITH RESPECT TO ANY MATTERS
RELATING TO THE PROPOSED MERGER.

THE SPECIAL MEETING (PAGE 14)

TIME, DATE, PLACE AND PURPOSE

         Harding will hold a special meeting of stockholders on Thursday, May
25, 2000, at 9:00 a.m., local time, at 707 Seventeenth Street, Suite 2400,
Denver, Colorado. At the Harding special meeting, the holders of shares of
Harding common stock will vote on the approval and adoption of the merger
agreement.

RECORD DATE AND VOTING POWER

         You are entitled to vote at the Harding special meeting if you owned
shares of Harding common stock as of the close of business on the record date of
April 20, 2000. On the record date, there were 5,100,996 shares of Harding
common stock outstanding held by approximately ___ record holders.

         You are entitled to one vote for each share of Harding common stock you
owned on the record date. The holders of a majority of the shares entitled to
vote at the Harding special


                                      -4-
<PAGE>   12

meeting must be present in person or by proxy in order to constitute a quorum
for all matters to come before the special meeting.

VOTE REQUIRED

         The affirmative vote of at least a majority of the outstanding shares
of Harding common stock entitled to vote is required to approve and adopt the
merger agreement and to consummate the merger.

PROXIES

         Harding will bear its own cost of solicitation of proxies. Harding will
reimburse brokerage houses, fiduciaries, nominees and others for their
out-of-pocket expenses in forwarding proxy materials to beneficial owners of
Harding common stock held in their names. Harding has retained the services of
Corporate Investor Communications, Inc. to assist in the solicitation. Fees for
such services are estimated to be approximately $5,000 plus reasonable
out-of-pocket expenses.

THE MERGER (PAGE 31)

WHAT HOLDERS OF HARDING COMMON STOCK WILL RECEIVE (PAGE 31)

         Each share of your Harding common stock held immediately prior to the
effective time of the merger other than shares held by stockholders who are
entitled to and who have perfected their appraisal rights will be exchanged for
the right to receive $11.50 in cash, without interest, subject to reduction for
applicable withholding or stock transfer taxes.

         HARDING STOCKHOLDERS SHOULD NOT SEND IN THEIR STOCK CERTIFICATES UNTIL
INSTRUCTED TO DO SO AFTER THE MERGER IS COMPLETED.

EFFECTIVE TIME OF THE MERGER (PAGE 31)

         The merger will become effective when a certificate of merger is filed
with the Delaware Secretary of State or at such later time as agreed to by
Harding and MACTEC.

INTERESTS OF CERTAIN PERSONS IN THE MERGER (PAGE 25)

         As of the record date, the directors and executive officers of Harding
and their affiliates directly owned an aggregate of 149,420 shares of Harding
common stock, representing approximately 3.0% of the shares of Harding common
stock outstanding on the record date. See "Security Ownership of Principal
Stockholders and Management of Harding" on page 45.

         Some directors and executive officers of Harding have interests in the
merger that are different from, or in addition to, your interests as a
stockholder. These interests may relate to or arise from, among other things,
potential change in control payments, the employment agreement with the Chief
Executive Officer of Harding and payments pursuant to Harding's deferred
compensation plan, which are discussed in more detail in "The Merger--Interests
of Directors and Executive Officers in the Merger" on page 25.



                                      -5-
<PAGE>   13

         Each outstanding option to purchase Harding common stock, whether or
not exercisable, will be canceled as of the effective time of the merger. Each
option holder will be entitled to receive an amount in cash equal to the excess,
if any, of the merger consideration over the exercise price per share of such
option multiplied by the number of shares of common stock previously subject to
such option, less any required withholding taxes.

CONDITIONS TO THE MERGER (PAGE 37)

         The completion of the merger depends upon the meeting of a number of
conditions, the primary ones being the following:

         o        the approval of the merger by the Harding stockholders;

         o        the expiration or termination of the waiting period applicable
                  to the consummation of the merger under the Hart-Scott-Rodino
                  Antitrust Improvements Act of 1976, as amended;

         o        the absence of legal restraints or prohibitions preventing, or
                  governmental actions challenging the consummation of the
                  merger;

         o        any material adverse change in Harding or in the financial
                  markets, including in the market for credit facilities;

         o        the availability of $14.5 million cash of Harding; and

         o        the material correctness of the representations and warranties
                  of the parties contained in the merger agreement and the
                  material performance of the obligations of the parties to be
                  performed under the merger agreement.

         Each condition to the merger may be waived by the party entitled to
assert the condition.

TERMINATION OF THE MERGER AGREEMENT (PAGE 39)

         Harding and MACTEC may, by mutual written consent, agree to terminate
the merger agreement without completing the merger, and either company may
terminate the merger agreement if any of the following occurs:

         o        the merger is not consummated by August 31, 2000 except that
                  the right to terminate the merger agreement is not available
                  to any party that is then in material breach or if such
                  party's material breach has resulted in the failure of the
                  merger to occur on or before August 31, 2000;

         o        any enactment or order of any governmental entity or court is
                  in effect that permanently prohibits, restrains, enjoins or
                  restricts the consummation of the merger; or


                                      -6-
<PAGE>   14

         o        Harding receives a "superior proposal" as defined in the
                  merger agreement, the Harding Board of Directors determines in
                  good faith to recommend or accept the superior proposal in
                  order to act in a manner consistent with its fiduciary duties
                  to the Harding stockholders and Harding pays MACTEC the
                  termination fee.

         MACTEC can terminate the merger agreement if any of the following
occurs:

         o        Harding enters into a binding agreement with respect to a
                  superior proposal, or the Harding Board withdraws, adversely
                  modifies or fails to reaffirm its approval or recommendation
                  of the merger agreement; or

         o        Harding breaches any representation, warranty, covenant or
                  agreement contained in the merger agreement that would cause
                  the condition relating to Harding's representations and
                  warranties or obligations pursuant to the merger agreement not
                  to be satisfied or incapable of being satisfied and such
                  breach is either not curable or, if curable, is not cured
                  within twenty days after written notice of such breach is
                  given by MACTEC.

         o        Harding can terminate the merger agreement if the following
                  occurs:

         o        MACTEC breaches any representation, warranty, covenant or
                  agreement contained in the merger agreement that would cause
                  the condition relating to MACTEC's representations and
                  warranties or obligations pursuant to the merger agreement not
                  to be satisfied or incapable of being satisfied and such
                  breach is either not curable or, if curable, is not cured
                  within twenty days after written notice of such breach is
                  given by Harding.

TERMINATION FEES (PAGE 40)

         If the merger agreement is terminated by either MACTEC or Harding based
upon a material breach of material covenants, obligations, representations or
warranties of the other party, the breaching party will reimburse the
non-breaching party for costs and expenses incurred in connection with the
merger agreement and the transactions contemplated by the merger agreement in
the amount of $500,000. Depending on the circumstances of the termination, the
merger agreement may also require Harding to pay to MACTEC a termination fee of
$2.5 million.

FINANCING FOR THE MERGER (PAGE 28)

         MACTEC will fund the merger consideration with cash from credit
facilities obtained in connection with the transaction and equity contributions
of MACTEC's shareholders.

ACCOUNTING TREATMENT (PAGE 28)

         The merger will be treated as a "purchase" in accordance with generally
accepted accounting principles.



                                      -7-
<PAGE>   15

TAX CONSEQUENCES (PAGE 29)

         In general, you will recognize a capital gain or loss equal to the
difference between the cash you receive and your adjusted tax basis in the
shares of common stock surrendered. BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER,
EACH STOCKHOLDER IS URGED TO CONSULT HIS OR HER OWN TAX ADVISOR TO DETERMINE THE
PARTICULAR TAX EFFECTS OF THE MERGER, INCLUDING THE APPLICATION AND EFFECT OF
STATE, LOCAL AND OTHER TAX LAWS.

REGULATORY MATTERS (PAGE 28)

         The Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended
(the "Hart-Scott-Rodino Act"), requires Harding and MACTEC to furnish certain
information and materials to the Antitrust Division of the Department of Justice
and the Federal Trade Commission and requires that a specified waiting period
expire or be terminated before the merger can be completed. The waiting period
under the Hart-Scott-Rodino Act has not yet been terminated.

APPRAISAL RIGHTS (PAGE 41)

         Any stockholder who does not wish to accept the merger consideration
has the right under the Delaware General Corporation Law to receive the "fair
value" of his or her shares of common stock as determined by a Delaware court.
This "appraisal right" is subject to a number of restrictions and technical
requirements. Generally, in order to perfect appraisal rights (a) a dissenting
stockholder must not vote in favor of adopting and approving the merger
agreement and (b) a dissenting stockholder must make a written demand for
appraisal before the vote on the merger agreement is taken. Merely voting
against the merger agreement will not protect the right of appraisal. Appendix C
to this proxy statement contains the applicable provisions of the Delaware
General Corporation Law relating to appraisal rights.



                                      -8-
<PAGE>   16


                     FREQUENTLY ASKED QUESTIONS AND ANSWERS
                                ABOUT THE MERGER

Q:       WHY IS HARDING PROPOSING THE MERGER?

A:       The Harding Board of Directors believes the merger of Merger Sub with
and into Harding, with Harding to be the surviving corporation and a
wholly-owned subsidiary of MACTEC, is advisable and in the best interests of
Harding and its stockholders. The merger allows the shareholders the benefit of
a substantial premium over recent trading prices and allows Harding the benefit
of substantially broadening its technical resources. See page 18.

Q:       WHAT WILL I RECEIVE IN THE MERGER?

A:       Each share of Harding common stock you own, other than shares for
which you are entitled to and have perfected your appraisal rights, will be
converted into the right to receive $11.50 in cash, without interest, subject to
reduction for applicable withholding or stock transfer taxes.

Q:       WHAT DO I NEED TO DO NOW?

A:       If you are a stockholder of Harding, you should simply indicate on your
proxy card how you want to vote, then sign and mail your proxy card in the
enclosed return envelope as soon as possible so that your shares may be
represented at the Harding special meeting. If you sign and send in your proxy
but do not indicate how you want to vote, your proxy will be counted as a vote
for the merger. You may withdraw your proxy at any time prior to its use at the
Harding special meeting by following the directions on page 15.

Q:       WHEN DO YOU EXPECT THE MERGER TO BE COMPLETED?

A:       We are working toward obtaining regulatory approvals and completing the
merger as quickly as possible. We currently expect to complete the merger by May
25, 2000.

Q:       WHAT ARE THE TAX CONSEQUENCES OF THE MERGER?

A:        The receipt of the merger consideration ($11.50 in cash per share) by
holders of common stock pursuant to the merger will be a taxable transaction for
federal income tax purposes. Tax considerations to you resulting from your own
individual circumstances and the merger may be complex. You should carefully
read the discussion of the material U.S. federal income tax consequences of the
merger on page 29 of this document and consult with your own advisors as to the
federal, state and local tax consequences. Foreign stockholders should consult
with local advisors as to the tax consequences of the merger.

Q:       WHAT IS THE HARDING BOARD OF DIRECTORS' RECOMMENDATION ON THE MERGER?

A:       The Harding Board of Directors unanimously approved the merger
agreement and recommends that you vote FOR the proposal to approve and adopt the
merger agreement. See page 21.



                                      -9-
<PAGE>   17

Q:       WHAT VOTE IS REQUIRED TO APPROVE THE MERGER?

A:       In order to complete the merger, the merger agreement must be
unanimously approved and adopted by the affirmative vote of at least a majority
of the outstanding shares of Harding common stock entitled to vote.

Q:       HOW CAN I FIND MORE INFORMATION ABOUT THE MERGER?

A:       This document contains important information regarding the proposed
merger, as well as information about MACTEC and Harding. It also contains
important information about the factors management and the Board of Harding
considered in evaluating the proposed merger. We urge you to read this document
carefully, including the appendices, and to consider how the merger affects you
as a stockholder. You also may want to review the documents referenced under
"Where You Can Find More Information" on page 48. For information about where to
call to get answers to your questions, see "Who Can Help Answer My Questions?"
on page 11.

Q:       IF MY SHARES ARE HELD IN STREET NAME BY MY BROKER, WILL MY BROKER VOTE
MY SHARES FOR ME?

A:       No. Your broker will not vote your shares for you unless you provide
instructions on how to vote. It is important therefore that you follow the
directions provided by your broker regarding how to instruct your broker to vote
your shares. Without instructions, your shares will not be voted, which for
purposes of voting on the proposed merger will have the same effect as voting
against the proposed merger.

Q:       MAY I CHANGE MY VOTE AFTER I HAVE MAILED MY SIGNED PROXY CARD?

A:       Yes. You may change your vote at any time before your proxy is voted
at the Harding special meeting. You may do this in one of three ways: You may
send the Harding Secretary a written notice stating that you would like to
revoke your proxy; you may complete and submit a new proxy card; or you may
attend the Harding special meeting and vote in person if you tell the Harding
Secretary that you want to cancel your proxy and vote in person. Simply
attending the Harding special meeting, however, will not revoke your proxy.

         If you choose either of the first two options above, you must submit
your notice of revocation or your new proxy card to Harding at the address on
the following page. If you have instructed a broker to vote your shares, you
must follow directions received from your broker to change your vote or to vote
in person at the Harding special meeting.

Q:       SHOULD I SEND IN MY STOCK CERTIFICATES NOW?

A:       No. After the merger is complete, the payment agent appointed by MACTEC
will send you written instructions for exchanging your stock certificates. See
page 31.



                                      -10-
<PAGE>   18

Q:       WHO CAN HELP ANSWER MY QUESTIONS?

A:       If you have more questions about the proposals, you should contact:

               Harding Lawson Associates Group, Inc.
               707 Seventeenth Street, Suite 2400
               Denver, CO  80202
               Attention:  Valorie B. Feher, Secretary
               (303) 293-6100



                                      -11-
<PAGE>   19



                      MARKET PRICE OF HARDING COMMON STOCK
                              AND DIVIDEND HISTORY

         Harding common stock is traded on the Nasdaq National Market under the
symbol "HRDG." The following tables set forth the high and low daily closing
prices of the Harding common stock as reported on Nasdaq for the fiscal quarters
indicated. Harding's fiscal year end is May 31.

<TABLE>
<CAPTION>
                                                                         High                Low
                                                                         ----                ---
<S>                                                                   <C>                 <C>
    First Quarter............................................          $  8.50             $ 6.38
    Second Quarter...........................................            10.75               8.00
    Third Quarter............................................            10.25               8.88
    Fourth Quarter...........................................            10.50               9.00
1999
    First Quarter............................................          $ 10.13             $ 6.25
    Second Quarter...........................................             8.25               5.13
    Third Quarter............................................             8.25               5.13
    Fourth Quarter...........................................             9.00               5.38
2000
    First Quarter............................................          $ 8.875             $ 7.38
    Second Quarter...........................................            8.875               6.50
    Third Quarter............................................           8.3125               6.75
    Fourth Quarter (through April ___, 2000)                                                 7.63
</TABLE>


         Set forth below are the high, low and closing sale prices of Harding
common stock on March 23, 2000, and April ___, 2000. March 23, 2000 was the last
full trading day prior to the public announcement of the merger, and April ___,
2000 was the last practicable trading day for which information was available
prior to the date of the first mailing of this document.

<TABLE>
<CAPTION>
                                   Harding Common Stock
                        High                 Low               Close
                        ----                 ---               -----
<S>                     <C>                 <C>                <C>
March 23, 2000          $9.25               $8.50              $9.25
April __, 2000
</TABLE>


We urge you to obtain current market quotations of Harding common stock.

         Harding has not paid cash dividends on the common stock during the last
ten years. The Board of Directors currently intends to retain all earnings for
reinvestment in Harding's business and has no present intention of paying cash
dividends in the foreseeable future.


                                      -12-
<PAGE>   20

                 SELECTED CONSOLIDATED FINANCIAL DATA OF HARDING

         The following table sets forth selected consolidated financial data of
Harding for the years ended May 31, 1995 through 1999 and for the nine-month
periods ended on February 29, 2000 and February 28, 1999. The data presented
below are derived from and should be read in conjunction with the consolidated
financial statements of the Company, including notes thereto, incorporated by
reference into this document. In the opinion of Harding's management, the
nine-month selected consolidated financial statements include all adjustments,
consisting of normal recurring adjustments, necessary for a fair statement of
the results for the unaudited interim periods. The results for such interim
periods are not necessarily indicative of results that can be expected for the
full year. In addition, the following selected consolidated financial data
should be read in conjunction with Harding's "Management's Discussion and
Analysis of Financial Condition and Results of Operations" incorporated by
reference into this document. See "Where You Can Find More Information" on pages
48 to 49.

                   SELECTED CONSOLIDATED FINANCIAL INFORMATION
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                           9 Months Ended
                                           February 28/29,                            Fiscal Years Ended May 31,
                                       ----------------------     --------------------------------------------------------------
                                          2000        1999           1999            1998        1997        1996        1995
                                       ----------  ----------     ----------      ----------  ----------  ----------  ----------
Income Statement Data:                      (unaudited)
<S>                                    <C>         <C>            <C>             <C>         <C>         <C>         <C>
    Gross revenue                      $  128,317  $  121,466     $  162,096      $  123,270  $  123,412  $  120,708  $  130,544
    Net revenue                            83,782      80,773        108,758          83,451      84,276      85,655      92,455
    Operating income/(loss)                 6,532       2,319(1)      (1,019)(2)       3,220       4,112         839       4,595
    Income/(loss) before provision
      for income taxes and minority
      interest                              6,826       2,668(1)        (568)(2)       4,262       4,288       1,647       4,907
    Net income/(loss)                       3,950       1,566(1)        (842)(2)       2,488       2,404         953       2,972

    Basic net income/(loss) per        $     0.79  $     0.32     $    (0.17)     $     0.50  $     0.49  $     0.20  $     0.63
      share
    Shares used in computing basic
      net income per share                  4,984       4,844          4,839           4,959       4,926       4,824       4,684
    Diluted net income/(loss) per      $     0.77  $     0.32     $    (0.17)     $     0.49  $     0.49  $     0.20  $     0.63
      share
    Shares used in computing
      diluted net income per share          5,150       4,890          4,839           5,087       4,950       4,844       4,700

Balance Sheet Data:
    Working capital                    $   38,394  $   34,168     $   32,697      $   34,680  $   37,780  $   35,521  $   33,369
    Total assets                           78,695      78,122         87,141          76,618      67,366      60,364      60,788
    Short-term debt                            --          --             --              --          --          --          --
    Shareholders' equity                   52,258      49,954         47,455          49,788      46,602      44,357      42,685
</TABLE>


(1)  Includes charges of $700 recorded in the second quarter related to (i)
     severance and recruiting costs related to a change in CEO position and (ii)
     the costs associated with abandoning certain leased space.

(2)  Includes charges of $4,383 recorded in the fourth quarter related to (i)
     the write-down of its investment in its Australian operations and the
     closure of its operations in Mexico City ($2,154); (ii) corporate
     restructuring ($2,029)and (iii) the write-down of goodwill related to an
     acquisition made by the Company in 1993 ($200).


                                      -13-
<PAGE>   21

                           THE HARDING SPECIAL MEETING

TIME, PLACE AND DATE

         This document is being furnished to Harding stockholders as part of the
solicitation of proxies by the Harding Board of Directors for use at a special
meeting of stockholders of Harding to be held on May 25, 2000, at 9:00 a.m.,
local time, at 707 Seventeenth Street, Suite 2400, Denver, Colorado, and at any
adjournment or postponement thereof. This document and the enclosed form of
proxy are first being mailed to stockholders of Harding on or about April __,
2000.

PURPOSE OF THE SPECIAL MEETING

         At the Harding special meeting, the holders of shares of Harding common
stock will vote on:

         o        the approval and adoption of the merger agreement;

         o        the transaction of such other business as may properly come
                  before the Harding special meeting. Only such business that is
                  brought before the special meeting by or at the direction of
                  the Board of Directors will be conducted at the special
                  meeting.

         The Harding Board of Directors, after careful consideration, has
unanimously approved the merger agreement and recommends that you vote "FOR"
approval and adoption of the merger agreement.

RECORD DATE, OUTSTANDING SHARES AND VOTING

         Holders of record of Harding common stock at the close of business on
the record date of April 20, 2000 are entitled to notice of and to vote at the
Harding special meeting. On the record date, there were 5,100,996 shares of
Harding common stock outstanding held by approximately ___ record holders. Each
share of Harding common stock as of the record date entitles its owner to one
vote.

QUORUM

         The representation, in person or by properly executed proxy, of the
holders of a majority of all of the shares of stock entitled to vote at the
Harding special meeting is necessary to constitute a quorum at the Harding
special meeting. Shares of Harding common stock represented in person or by
proxy will be counted for the purposes of determining whether a quorum is
present at the Harding special meeting.

VOTE REQUIRED

         The holders of a majority of the shares of Harding common stock
outstanding on the record date and entitled to vote must vote affirmatively to
approve and adopt the merger agreement. Shares which abstain from voting will be
treated as shares that are present and


                                      -14-
<PAGE>   22

entitled to vote at the Harding special meeting for purposes of determining
whether a quorum exists, but abstentions will have the same effect as votes
against approval of the merger agreement. Broker non-votes, which are shares
held by brokers or nominees for which no instructions are given by the
beneficial owners of such shares, will have the same effect as shares voted
against approval of the merger agreement.

         As of the record date, directors and executive officers of Harding and
their affiliates have the right to vote approximately 10.6% of the outstanding
shares of Harding common stock, which include shares held in trust in various
company retirement savings plans for which the Board of Directors exercises
voting power.

VOTING OF PROXIES

         All shares of Harding common stock which are entitled to vote and are
represented at the Harding special meeting by properly executed proxies received
prior to or at such meeting, and not revoked, will be voted at the Harding
special meeting in accordance with the instructions indicated on such proxies.
If no instructions are indicated, such proxies, other than broker non-votes,
will be voted for approval and adoption of the merger agreement.

         The Harding Board does not know of any matters other than those
described in the notice of the Harding special meeting that are to come before
the Harding special meeting. If any other matters are properly presented at the
Harding special meeting for consideration, including consideration of a motion
to adjourn or postpone such meeting to another time and/or place for the
purposes of soliciting additional proxies or allowing additional time for the
satisfaction of conditions to the merger, the persons named in the enclosed form
of proxy and acting under such proxy generally will have discretion to vote on
such matters in accordance with their best judgment.

REVOCATION OF PROXIES

         Any proxy given in accordance with this solicitation may be revoked by
the person giving it at any time before it is voted. Proxies may be revoked by:

         o        giving the Secretary of Harding, at or before the taking of
                  the vote at the Harding special meeting, a written notice of
                  revocation bearing a later date than the proxy;

         o        duly executing a later dated proxy relating to the same shares
                  and delivering it to the Secretary of Harding before the
                  taking of the vote at the Harding special meeting; or

         o        attending the Harding special meeting and voting in person,
                  although attendance at the Harding special meeting will not
                  in and of itself constitute a revocation of a proxy.

         Any written notice of revocation or subsequent proxy should be sent to
Harding Lawson Associates Group, Inc., 707 Seventeenth Street, Suite 2400,
Denver, Colorado 80202,


                                      -15-
<PAGE>   23

Attention: Valorie B. Feher, Secretary, or hand delivered to the Secretary of
Harding at or before the taking of the vote at the Harding special meeting.
Stockholders that have instructed a broker to vote their shares must follow
directions received from such broker in order to change their vote or to vote at
the Harding special meeting.

SOLICITATION OF PROXIES

         Harding will bear its own cost of solicitation of proxies. Harding will
reimburse brokerage houses, fiduciaries, nominees and others for their
out-of-pocket expenses in forwarding proxy materials to beneficial owners of
Harding common stock held in their names. Harding has retained the services of
Corporate Investor Communications, Inc. to assist in the solicitation. Fees for
such services are estimated to be approximately $5,000 plus reasonable
out-of-pocket expenses.


                                      -16-

<PAGE>   24



                                   THE MERGER

BACKGROUND OF THE MERGER

         In September, 1999, Scott E. State, the Chief Executive Officer of
MACTEC, called Robert L. Costello, Jr., the Chief Executive Officer of Harding
to propose a lunch meeting on October 7, 1999 for the purpose of discussing
areas of common interest. Among the matters discussed at that lunch meeting were
the recent move of Harding's headquarters to Denver, the industry in general and
Harding's publicly announced restructuring. There was only a brief reference
during the meeting to the possibility of a combination, this being in the
context of a discussion regarding recent industry mergers.

         In November, 1999, Robert Costello called Scott State for the purpose
of proposing a meeting that was subsequently held on December 1, 1999. At that
meeting, Robert Costello inquired about MACTEC's business and its investors'
objectives and inquired with regard to the possibility of MACTEC's investors
acquiring an equity interest in Harding. Mr. State indicated that it was
unlikely that the investors would want to acquire a minority interest and
indicated that a full combination of the two firms would make more sense. Mr.
Costello requested financial information from MACTEC that would allow Harding to
evaluate a potential acquisition of MACTEC. Scott State agreed to that request,
as a result of which the parties executed a Confidentiality Agreement on
December 7, 1999.

         Scott State called Robert Costello in January, 2000 to determine
Harding's interest in a transaction. Mr. Costello responded that he was
evaluating several other alternatives and agreed to respond to Mr. State within
the next few weeks.

         On February 8, 2000, Scott State called Robert Costello to advise him
he had received an inquiry from one of the shareholders of Harding relating to
the desirability of a merger transaction between the two companies. Later that
same week, Scott State again called Robert Costello and indicated an interest in
an acquisition of Harding by MACTEC. A discussion followed as to the ability of
MACTEC to obtain the financing necessary to do the transaction and as to what
price MACTEC would be prepared to offer. Scott State and Robert Costello agreed
to meet personally for the purpose of discussing the issues that would be
involved in an acquisition.

         On February 21, 2000, Robert Costello and Scott State met to discuss
the industry, recent consolidations and issues relating to a potential
combination of the two companies. It was agreed that Harding would provide
information that would enable MACTEC's lenders and investors to give a
preliminary indication of support for a transaction. Robert Costello informed
the Chairman of the Board of Directors of Harding and another director of
Harding of the discussions.

         On March 3, 2000, Robert Costello met with Scott State, Randall Clark,
a representative of a MACTEC investor and a Board member, and Chris Goodwin and
Lee Buckner of Paribas. There was a discussion of shareholder issues, a proposed
financing commitment by Paribas and strategic plans going forward. It was agreed
that the due diligence process would be continued and Robert Costello informed
all Harding directors that preliminary


                                      -17-
<PAGE>   25

discussions had begun with regard to a potential transaction and that there
would be many issues that would have to be resolved.

         On March 10, 2000, a proposed draft of a merger agreement was submitted
to Robert Costello by MACTEC and was then turned over to Harding's legal
counsel, Howard, Rice, Nemerovski, Canady, Falk & Rabkin, for review. On March
12, 2000, Scott State and Robert Costello discussed by telephone issues related
to the form of agreement and merger process.

         On March 15, 2000, at a regular meeting of the Board of Directors of
Harding, Robert Costello, a representative of Howard, Rice, Nemerovski, Canady,
Falk & Rabkin and representatives of Harding's financial advisor, CIBC World
Markets, discussed with the Board of Directors of Harding the proposed
transaction and the issues that would have to be resolved, including issues
relating to price and break-up fee. No action was taken by the Board, but the
Board authorized management to continue discussions with MACTEC and report back
to the Board.

         On the afternoon of March 15, 2000, Robert Costello and a
representative of Howard, Rice, Nemerovski, Canady, Falk & Rabkin met with Scott
State, John W. Flanigan, a representative of a MACTEC investor and a Board
member, and representatives of MACTEC's legal counsel, Morrison & Foerster LLP,
and discussed issues to be resolved in the merger agreement. Between March 15,
2000 and March 23, 2000, representatives of Harding further negotiated the
merger agreement with representatives of MACTEC.

         On March 23, 2000, the Harding Board of Directors held a special
meeting attended by members of Harding's senior management, representatives of
CIBC World Markets and a representative of Howard, Rice, Nemerovski, Canady,
Falk & Rabkin. Prior to the meeting, each member of the Board of Directors had
been presented with a current draft of the merger agreement. Legal counsel
summarized the terms of the proposed agreement and CIBC World Markets summarized
the material terms and conditions of the bank commitment received by MACTEC in
connection with the proposed financing of the transaction. CIBC World Markets
also described its financial analysis of the merger consideration and rendered
to the Harding Board of Directors its opinion to the effect that, as of the date
of the opinion and based on and subject to the matters described in its opinion,
the merger consideration was fair, from a financial point of view, to the
holders of Harding common stock. Following discussions, the Board of Directors
of Harding declared that the merger agreement was advisable and in the best
interests of Harding and the stockholders and unanimously approved the merger
agreement. Harding and MACTEC executed the definitive merger agreement in the
late afternoon of March 23, 2000.

         On the morning of March 24, 2000, Harding and MACTEC issued a joint
press release announcing the execution of the merger agreement.

HARDING'S REASONS FOR THE MERGER

         The reasons for the decision of the Board of Directors that the merger
was advisable and in the best interests of the shareholders of Harding are that
the merger will allow the stockholders of Harding to receive a substantial
premium over recent trading prices of Harding stock and that the competitive
environment in the engineering services industry made desirable a consolidation
with another leading firm in the industry for the purpose of substantially



                                      -18-
<PAGE>   26

broadening the base of technical resources available to clients. With regard to
the value of the transaction to the stockholders of Harding, the Board took into
consideration, in addition to the other pricing considerations discussed below,
the fact that the stock of Harding has not traded at a price as high as $11.50
per share since 1993. As to the business benefits of the combination, the merger
will combine firms ranked No. 26, in the case of MACTEC and No. 28, in the case
of Harding, among the nation's largest environmental engineering firms and will
create a company having nearly $325,000,000 of annual revenues, almost double
those of Harding's current revenues, and having over 2,000 employees located in
key cities throughout the United States.

         In reaching its determination to approve the merger, and to recommend
that Harding stockholders vote to approve and adopt the merger agreement, the
Harding Board of Directors considered the following material factors:

         o        The financial and other terms of the merger agreement;

         o        The business, results of operations, properties and financial
                  condition of the Company and the nature of the industry in
                  which it operates;

         o        The fact that the per share price represents a 44% premium
                  over the average trading price of Harding's common stock for
                  the three months prior to the date of the meeting;

         o        The history of the price of the shares of common stock of
                  Harding on Nasdaq over the last several years and the recent
                  daily trading volume in Harding's shares;

         o        The discussions held by Harding with other companies regarding
                  potential business combination transactions with Harding and
                  the Board's view, in light of these discussions, as to the
                  likelihood of a superior proposal;

         o        Harding's existing competitive and market position, including
                  Harding's ability to effectively compete with companies having
                  significantly greater financial resources than the Company;

         o        The alternatives available to the Harding in light of the
                  consideration proposed to be received pursuant to the merger
                  agreement, including continuing to maintain Harding as an
                  independent company and not engaging in any extraordinary
                  transaction or engaging in an extraordinary transaction
                  designed to increase the trading price for the shares of
                  common stock of the Harding;

         o        The financial presentation of CIBC World Markets and its
                  opinion as to the fairness, from a financial point of view, of
                  the merger consideration to the holders of Harding common
                  stock;

         o        The provisions of the proposed merger agreement, including the
                  provision allowing Harding to respond to a proposal concerning
                  an acquisition of Harding that the Board determines in good
                  faith is reasonably likely to be a superior


                                      -19-
<PAGE>   27

                  proposal, and the provisions which permit Harding to terminate
                  the proposed merger agreement upon payment to MACTEC of a
                  termination fee in the event of receipt of a superior
                  proposal;

         o        Whether MACTEC is able to meet its obligations under the
                  merger agreement; and

         o        Legal matters relating to the merger agreement, including the
                  review provided for under the Hart-Scott-Rodino Act with
                  respect to the antitrust implications of the transaction.

         The Harding Board of Directors also took into account the fact that as
a result of the merger the Harding stockholders would no longer participate in
any future growth and prospects of Harding. However, the Harding Board believed
that a sale of Harding under the terms of the merger would achieve greater value
at this time for the Harding stockholders as compared with remaining a public
company. The Harding Board concluded that the potential benefits of the merger
outweighed the potential risks.

         The Harding Board of Directors did not quantify or otherwise assign
relative weights to these factors or determine that any factor was of particular
importance. Rather, the Harding Board made its recommendation based on the
totality of the information presented to and considered by it.

RECOMMENDATION OF THE BOARD OF DIRECTORS OF HARDING

         The Harding Board of Directors has determined that the merger agreement
is advisable and in the best interests of Harding and its stockholders.
Accordingly, the Harding Board has unanimously approved the merger agreement and
recommends that Harding stockholders vote FOR approval and adoption of the
merger agreement at the Harding special meeting.

OPINION OF HARDING'S FINANCIAL ADVISOR

         Harding engaged CIBC World Markets to act as its exclusive financial
advisor in connection with the merger. On March 23, 2000, at a meeting of the
Harding Board of Directors held to evaluate the proposed merger, CIBC World
Markets rendered an oral opinion, which opinion was confirmed by delivery of a
written opinion dated March 23, 2000, to the effect that, as of that date and
based on and subject to the matters described in its opinion, the merger
consideration was fair, from a financial point of view, to the holders of
Harding common stock.

         THE FULL TEXT OF CIBC WORLD MARKETS' WRITTEN OPINION DATED MARCH 23,
2000, WHICH DESCRIBES THE ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITATIONS
ON THE REVIEW UNDERTAKEN, IS ATTACHED AS APPENDIX B AND IS INCORPORATED INTO
THIS PROXY STATEMENT BY REFERENCE. CIBC WORLD MARKETS' OPINION IS ADDRESSED TO
THE HARDING BOARD OF DIRECTORS, RELATES ONLY TO THE FAIRNESS OF THE MERGER
CONSIDERATION FROM A FINANCIAL POINT OF VIEW, AND DOES NOT CONSTITUTE A
RECOMMENDATION TO ANY STOCKHOLDER AS TO ANY MATTERS RELATING TO THE


                                      -20-
<PAGE>   28

PROPOSED MERGER. THE SUMMARY OF CIBC WORLD MARKETS' OPINION DESCRIBED BELOW IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF ITS OPINION.

         In arriving at its opinion, CIBC World Markets:

         o        reviewed the merger agreement;

         o        reviewed audited financial statements of Harding for the
                  fiscal years ended May 31, 1997, May 31, 1998 and May 31,
                  1999;

         o        reviewed unaudited financial statements of Harding for the
                  fiscal quarters ended August 31, 1999 and November 30, 1999;

         o        reviewed financial projections for Harding prepared by the
                  management of Harding;

         o        reviewed the historical market prices and trading volume for
                  Harding common stock;

         o        held discussions with the senior management of Harding with
                  respect to the business and prospects for future growth of
                  Harding;

         o        reviewed and analyzed publicly available financial data for
                  companies that CIBC World Markets deemed comparable to
                  Harding;

         o        performed a discounted cash flow analysis of Harding using
                  assumptions of future performance provided to CIBC World
                  Markets by the management of Harding;

         o        reviewed and analyzed publicly available information for
                  transactions that CIBC World Markets deemed comparable to the
                  merger;

         o        reviewed public information concerning Harding;

         o        at the request of Harding, approached and held discussions
                  with third parties to solicit indications of interest in the
                  possible acquisition of Harding; and

         o        performed other analyses and reviewed other information as it
                  deemed appropriate.

         In rendering its opinion, CIBC World Markets relied on and assumed,
without independent verification or investigation, the accuracy and completeness
of all of the financial and other information provided to or discussed with CIBC
World Markets by Harding and its employees, representatives and affiliates. With
respect to forecasts of the future financial condition and operating results of
Harding provided to or discussed with CIBC World Markets, CIBC World Markets
assumed, at the direction of Harding's management, without independent


                                      -21-
<PAGE>   29

verification or investigation, that the forecasts were reasonably prepared on
bases reflecting the best available information, estimates and judgments of
Harding's management.

         CIBC World Markets did not make or obtain any independent evaluations
or appraisals of the assets or liabilities, contingent or otherwise, of Harding
or its affiliated entities. CIBC World Markets expressed no opinion as to the
underlying valuation, future performance or long-term viability of Harding, or
the price at which Harding common stock would trade or otherwise be transferable
after announcement or upon consummation of the merger. CIBC World Markets'
opinion was necessarily based on the information available to CIBC World Markets
and general economic, financial and stock market conditions and circumstances as
they existed and could be evaluated by CIBC World Markets as of the date of its
opinion. Although subsequent developments may affect its opinion, CIBC World
Markets does not have any obligation to update, revise or reaffirm its opinion.
No other instructions or limitations were imposed by the Harding Board of
Directors on CIBC World Markets with respect to the investigations made or the
procedures followed by it in rendering its opinion.

         The following is a summary of the material financial analyses performed
by CIBC World Markets in connection with its opinion to the Harding Board of
Directors dated March 23, 2000:

SELECTED COMPANIES ANALYSIS

         CIBC World Markets reviewed financial and operating data for the
following 10 selected publicly held companies in the engineering and
construction industry:

         o        The IT Group, Inc.

         o        Tetra Tech, Inc.

         o        URS Corp.

         o        Ecology and Environment, Inc.

         o        GZA GeoEnvironmental Technologies, Inc.

         o        Michael Baker Corp.

         o        Roy F. Weston, Inc.

         o        Sevenson Environmental Services, Inc.

         o        STV Group, Inc.

         o        TRC Companies, Inc.

         CIBC World Markets reviewed enterprise values, calculated as equity
market value, plus debt, less cash, as multiples of, among other things, latest
12 months and estimated calendar year 2000 earnings before interest, taxes,
depreciation and amortization, commonly known as EBITDA, and earnings before
interest and taxes, commonly known as EBIT, and reviewed equity values as a
multiple of latest 12 months and estimated calendar year 2000 net income.
Multiples of latest 12 months EBITDA, EBIT and net income were calculated both
before and after taking into account the pro forma effects of cost synergies
generated by Harding's restructuring and multiples of estimated calendar year
2000 EBITDA and EBIT were calculated based on the present value of those
financial statistics, using a discount rate of 12.5%. CIBC


                                      -22-
<PAGE>   30

World Markets then applied a range of selected multiples of latest 12 months and
estimated calendar year 2000 EBITDA, EBIT and net income derived from the
selected companies to corresponding financial data of Harding. All multiples for
the selected companies were based on closing stock prices on March 21, 2000.
Estimated financial data for the selected companies were based on publicly
available research analysts' estimates and estimated financial data for Harding
were based on internal estimates of Harding's management. This analysis resulted
in an implied equity reference range for Harding of approximately $10.10 to
$11.40 per share, as compared to the merger consideration of $11.50 per share.

PRECEDENT TRANSACTIONS ANALYSIS

         CIBC World Markets reviewed the transaction values and implied
transaction multiples in the following 18 selected transactions effected in the
engineering and construction industry over the period June 1995 to May 1999:

<TABLE>
<CAPTION>
          Acquiror                                    Target
          --------                                    ------
<S>                                     <C>
o The IT Group, Inc.                    EMCON
o URS Corp.                             Dames & Moore Group
o The IT Group, Inc.                    Certain assets of ICF Kaiser International, Inc.
o Jacobs Engineering Group, Inc.        Sverdrup Corp.
o The IT Group, Inc.                    Fluor Daniel GTI, Inc.
o Dames & Moore Group                   Radian International LLC
o Harding                               ABB Environmental Services
o International Technology Corp.        OHM Corp.
o Investor Group                        ATC Group Services, Inc.
o URS Corp.                             Woodward-Clyde Group, Inc.
o The Carlyle Group                     International Technology Corp.
o Aspen Technology, Inc.                Setpoint, Inc.
o Tyco International Ltd.               Earth Technology Corp. (USA)
o URS Corp.                             Greiner Engineering, Inc.
o Fluor Daniel GTI, Inc.                Groundwater Technology, Inc.
o Thermo Remediation Inc.               Remediation Technologies, Inc.
o Raytheon Engineers & Constructors     Litwin Engineers & Constructors, Inc.
o Thermo Remediation Inc.               Nuclear Services Group
</TABLE>


         CIBC World Markets reviewed transaction values in the selected
transactions as multiples of latest 12 months EBITDA and EBIT and reviewed
equity values as a multiple of latest 12 months net income, both before and
after taking into account the pro forma effects of cost synergies generated by
Harding's restructuring. CIBC World Markets then applied a range of selected
multiples of latest 12 months EBITDA, EBIT and net income derived from the
selected transactions to corresponding financial data of Harding. All multiples
were based on publicly available information at the time of announcement of the
selected transactions. CIBC World



                                      -23-
<PAGE>   31
Markets noted, however, that stock prices of companies in the engineering and
construction industry generally had declined and the pace of consolidation in
that industry had slowed since May 1999. This analysis resulted in an implied
equity reference range for Harding of approximately $12.80 to $18.10 per share,
as compared to the merger consideration of $11.50 per share.


DISCOUNTED CASH FLOW ANALYSIS

         CIBC World Markets performed a discounted cash flow analysis of Harding
to estimate the present value of the stand-alone, unlevered, after-tax free cash
flows that Harding could generate for the last quarter of fiscal year 2000 and
the fiscal years 2001 through 2004, based on internal estimates of Harding's
management. The range of estimated terminal values for Harding was calculated by
applying terminal value multiples of 3.0x to 5.0x to Harding's estimated
calendar year 2004 EBITDA. The present value of the cash flows and terminal
values were calculated using discount rates ranging from 11.5% to 13.5%. This
analysis resulted in an implied equity reference range for Harding of
approximately $10.90 to $14.10 per share, as compared to the merger
consideration of $11.50 per share.

PREMIUMS PAID ANALYSIS

         CIBC World Markets reviewed the premiums paid in 65 transactions having
transaction values of between $50 million to $100 million effected since May 3,
1999. CIBC World Markets then applied the median premiums derived from these
transactions based on the per share market prices of the target company one
trading day, one week and four weeks prior to public announcement of the
transaction to the per share market prices of Harding common stock one day, one
week and four weeks prior to March 21, 2000. This analysis indicated an implied
equity reference range for Harding of approximately $9.70 to $11.00 per share,
as compared to the merger consideration of $11.50 per share.

OTHER FACTORS

         In rendering its opinion, CIBC World Markets also reviewed and
considered other factors, including:

         o          historical market prices and trading volumes of Harding
                    common stock and the relationship between movements in
                    Harding common stock, movements in the S&P 500 index and
                    movements in the common stock of the selected engineering
                    and construction companies; and

         o          the trading range for shares of Harding common stock for the
                    52-week period preceding the date of CIBC World Markets'
                    opinion.

         The above summary is not a complete description of CIBC World Markets'
opinion to the Harding Board of Directors or the financial analyses performed
and factors considered by CIBC World Markets in connection with its opinion. The
preparation of a fairness opinion is a complex analytical process involving
various determinations as to the most appropriate and relevant methods of
financial analysis and the application of those methods to the particular
circumstances and, therefore, a fairness opinion is not readily susceptible to
summary description. CIBC World Markets believes that its analyses and the
summary above must be considered as a whole and that selecting portions of its
analyses and factors, without considering


                                      -24-
<PAGE>   32

all analyses and factors, could create a misleading or incomplete view of the
processes underlying CIBC World Markets' analyses and opinion.

         In performing its analyses, CIBC World Markets considered industry
performance, general business, economic, market and financial conditions and
other matters existing as of the date of its opinion, many of which are beyond
the control of Harding. No company, transaction or business used in the analyses
as a comparison is identical to Harding or the merger, and an evaluation of the
results of those analyses is not entirely mathematical. Rather, the analyses
involve complex considerations and judgments concerning financial and operating
characteristics and other factors that could affect the acquisition, public
trading or other values of the companies, business segments or transactions
analyzed.

         The estimates contained in CIBC World Markets' analyses and the ranges
of valuations resulting from any particular analysis are not necessarily
indicative of actual values or future results, which may be significantly more
or less favorable than those suggested by its analyses. In addition, analyses
relating to the value of businesses or securities do not necessarily purport to
be appraisals or to reflect the prices at which businesses or securities
actually may be sold. Accordingly, CIBC World Markets' analyses and estimates
are inherently subject to substantial uncertainty.

         The type and amount of consideration payable in the merger was
determined through negotiation between Harding and MACTEC. Although CIBC World
Markets provided financial advice to Harding during the course of negotiations,
the decision to enter into the merger was solely that of Harding's Board of
Directors. CIBC World Markets' opinion and financial analyses were only one of
many factors considered by Harding's Board of Directors in its evaluation of the
merger and should not be viewed as determinative of the views of Harding's Board
of Directors or management with respect to the merger or the merger
consideration.

         Harding selected CIBC World Markets based on CIBC World Markets'
reputation, expertise and experience. CIBC World Markets is an internationally
recognized investment banking firm and, as a customary part of its investment
banking business, is regularly engaged in valuations of businesses and
securities in connection with acquisitions and mergers, underwritings, secondary
distributions of securities, private placements and valuations for other
purposes. In the ordinary course of business, CIBC World Markets and its
affiliates may actively trade the securities of Harding for their own account
and for the accounts of customers and, accordingly, may at any time hold a long
or short position in those securities.

         Harding has agreed to pay CIBC World Markets for its services upon
completion of the merger an aggregate fee of approximately $1.4 million. In
addition, Harding has agreed to reimburse CIBC World Markets for its reasonable
out-of-pocket expenses, including reasonable fees and expenses of its legal
counsel, and to indemnify CIBC World Markets and related parties against
liabilities, including liabilities under the federal securities laws, relating
to, or arising out of, its engagement.


                                      -25-
<PAGE>   33

INTERESTS OF DIRECTORS AND EXECUTIVE OFFICERS IN THE MERGER

         In considering the recommendation of the Harding Board of Directors,
Harding stockholders should be aware that certain of the directors and executive
officers of Harding may have interests in the merger that are different from, or
in addition to, the interests of Harding stockholders generally, and that may
create potential conflicts of interest. Harding directors, officers and
employees have rights with respect to severance provisions under existing
employment contracts, indemnification provisions and liability insurance in
connection with the merger. The Harding Board of Directors was aware of these
interests and considered them, among other factors, in approving the merger
agreement. These interests are summarized below.

SHARE OWNERSHIP

         As of the record date, directors and executive officers of Harding and
their affiliates directly owned approximately 3.0% of the outstanding shares of
Harding common stock. See "Security Ownership of Certain Beneficial Owners and
Management of Harding."

EMPLOYMENT AND SEVERANCE ARRANGEMENTS

         Harding is a party to an employment agreement with Robert L. Costello,
Jr., Harding's Chief Executive Officer, which contains a change of control
provision entitling Mr. Costello to 150% of his current base salary and full
vesting of his stock options upon a change of control plus the occurrence within
six months after the change of control of either an involuntary termination
without cause of Mr. Costello's employment or a voluntary termination of Mr.
Costello's employment following a material reduction in his duties or
responsibilities.

         Mr. Costello has entered into a new employment agreement with MACTEC
that will become effective on the closing under the merger agreement. The new
agreement would replace his employment agreement with Harding and would extend
approximately one year beyond the expiration date of his employment agreement
with Harding. His Harding options vest immediately prior to the effectiveness of
the merger along with those of all of the other optionholders.

         Provisions with regard to salary, bonuses, severance payments and other
benefits under the new employment agreement with MACTEC have been designed to be
substantially the same as those that were contained in Mr. Costello's employment
agreement with Harding. In addition to his right to terminate his employment
with MACTEC and receive a severance payment in the event of a material reduction
in his duties or responsibilities, Mr. Costello may terminate his employment
with MACTEC for any reason for a limited period of time after the date that is
one year following consummation of the merger and receive severance payments in
substantially the same amounts as provided in his current employment agreement.
Mr. Costello would be granted options under a new stock option plan of MACTEC
nominally covering 60,000 shares of the capital stock of MACTEC, 10,000 of which
would be exercisable at a price of $10.00 per share, the present fair market
value of MACTEC's stock, 20,000 of which would be exercisable at a price of
$15.00 per share and 30,000 of which would be exercisable at a price of $20.00
per share, based upon MACTEC's expected capitalization at the effective time of
the merger. Exercise of the maximum possible number of options would result in
Mr. Costello's


                                      -26-
<PAGE>   34

owning less than one percent of the outstanding stock of MACTEC. If the
financial performance targets in the new stock option plan to be determined by
MACTEC's Board are achieved, Mr. Costello's stock option package would be
substantially similar to that which Mr. Costello had under his existing
employment agreement.

         Harding is a party to a Retention Agreement with Claude Corvino, an
executive officer of Harding's wholly-owned subsidiary, Harding Lawson
Associates, Inc. The retention agreement contains certain change of control
provisions that together with certain triggering events within one year would
entitle Mr. Corvino to 100% of his regular annual salary, acceleration of any
unvested portion of options that had been granted previously, the continuation
of certain continuation of health and welfare benefits and reimbursement for
certain professional outplacement.

         Harding is a party to change of control severance agreements with the
following other persons who are executive officers of Harding or its
subsidiaries: Michael Carroll, Ann E. Massey, Oliver P. Wesley and Valorie B.
Feher. Under these agreements, all of which are substantially identical, in the
event there is a change of control in Harding, plus the occurrence of at least
one other triggering event, such executives are entitled to compensation equal
to 100% of their regular annual salary and the acceleration of the unvested
portion of options held by them.

         Employment, retention and severance arrangements under the foregoing
agreements are in lieu of severance benefits under Harding's severance policy
available to all employees.

OPTIONS

         All options held by directors and executive officers will vest
immediately prior to the effective time of the merger. The holders thereof will
receive cash for each option equal to the excess, if any, of the merger
consideration over the exercise price per share of such option, less applicable
withholding taxes.

         The options held by Mr. Costello covering 130,000 shares exercisable at
a price of $6.9375 per share and an additional 100,000 shares exercisable at a
price of $10.00 per share will be converted into the right to receive cash in
the amount of $743,125, based upon the difference between $11.50 a share and the
respective exercise prices of those options. The options held by the other
directors and executive officers of Harding will be converted into the right to
receive cash in the following amounts: Mr. Puntillo--$46,818; Mr.
Edgar--$28,125; Mr. Platt--$23,034; Mr. Stager--$16,688; Mr. Waller--$10,125;
Mr. Carroll--$110,840; Mr. Corvino--$199,743; Ms. Feher--$36,063; Ms.
Massey--$61,682; and Mr. Wesley--$136,090.

         See "Security Ownership of Principal Stockholders and Management of
Harding" on page 45.

NON-QUALIFIED DEFERRED COMPENSATION PLAN

         The merger agreement requires that the Non-Qualified Deferred
Compensation Plan of Harding and the rabbi trust used in connection therewith be
terminated prior to the effective time of the merger. Upon termination of the
Plan, the following shares of common stock of


                                      -27-
<PAGE>   35

Harding and amounts will be distributed out of the Plan to directors and
executive officers of Harding:


<TABLE>
<CAPTION>
          Officer/Director         Harding Shares            Mutual Funds
          ----------------         --------------            ------------
                                                            (as of 2/29/00)
<S>                               <C>                      <C>
  Michael D. Carroll                      317                     $1,225
  Claude Corvino                        1,722                    567,176
  Anne E. Massey                            0                      6,362
  Oliver P. Wesley                      2,094                      5,445
  Ross K. Anderson                      5,964                          0
  James M. Edgar                        9,571                          0
  Stuart F. Platt                       5,141                     54,853
  Richard D. Puntillo                  34,502                        386
  Donald K. Stager                     10,789                          0
  Frank S. Waller                         778                          0
</TABLE>


INDEMNIFICATION AND INSURANCE

         Under the terms of the merger agreement, from and after the merger,
MACTEC is obligated for a period of six years to continue in full force and
effect the indemnification rights presently in effect for present and former
directors and officers of Harding. These individuals have the right to be
indemnified against any costs or expenses (including reasonable attorneys' fees
and the right to have expenses advanced), judgments, fines, losses, damages or
liabilities incurred in connection with any claim, action, suit, proceeding or
investigation arising out of matters existing or occurring at or prior to the
effective time of the merger, to the fullest extent that Harding would have been
permitted under Delaware law. If the merger closes, MACTEC and Merger Sub must
cause the surviving corporation to honor the indemnification agreements in
effect for Harding's former and existing directors and officers. In addition,
MACTEC is obligated to keep in effect for that six years the existing directors'
and officers' liability insurance maintained by Harding, subject to a limitation
on the amount of insurance premium MACTEC would have to pay for that purpose.

FINANCING FOR THE MERGER

         MACTEC intends to fund the merger consideration with cash from credit
facilities obtained in connection with the transaction and equity contributions
of MACTEC's shareholders.

EXPECTED ACCOUNTING TREATMENT OF THE MERGER

         The merger will be accounted for using the purchase method of
accounting for financial reporting purposes under accounting principles
generally accepted in the United States. Under this method of accounting, the
aggregate consideration paid by MACTEC in connection with the merger will be
allocated to Harding's assets and liabilities based on their fair values, with
any excess or deficit being treated as goodwill. Goodwill from such an
acquisition is generally amortized in equal annual installments over a period of
time. The assets and liabilities


                                      -28-
<PAGE>   36

and results of operations of Harding will be consolidated into the assets and
liabilities and results of operations of MACTEC from the date of the merger.

HART-SCOTT-RODINO FILINGS

         Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, and the rules promulgated thereunder, certain transactions, including
the merger, may not be consummated until Notification and Report Forms pursuant
to the Act have been filed with the Antitrust Division of the Department of
Justice and the Federal Trade Commission and specified waiting period
requirements have been satisfied. On April __, 2000, each of MACTEC and Harding
filed a Notification and Report Form pursuant to the Act with the Antitrust
Division and the FTC. The waiting period under the Act has not yet been
terminated. At any time before or after the effective time of the merger, the
FTC, the Antitrust Division or others could take action under the antitrust laws
with respect to the merger, including seeking to enjoin the consummation of the
merger, to rescind the merger or to require either MACTEC or Harding to divest
substantial assets. Neither Harding nor MACTEC believe the merger will violate
the antitrust laws. There can be no assurance that a challenge to the merger on
antitrust grounds will not be made or, if such a challenge is made, that it
would not be successful.

MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

         Upon consummation of the merger each outstanding share of Harding
common stock will be converted into the right to receive $11.50 in cash, without
interest, subject to reduction for applicable withholding or stock transfer
taxes. The following discussion is a summary of the principal federal income tax
consequences of the merger to the stockholders of Harding whose shares of common
stock are surrendered pursuant to the merger (including any cash amounts
received by dissenting stockholders pursuant to the exercise of appraisal
rights). The discussion below does not purport to deal with all aspects of
federal income taxation that may affect particular stockholders in light of
their individual circumstances, and is not intended for stockholders subject to
special treatment under the federal income tax law, including insurance
companies, tax exempt organizations, financial institutions, broker-dealers,
foreign persons, stockholders who hold their stock as part of a hedge,
appreciated financial position, straddle or conversion transaction, stockholders
who do not hold their stock as capital assets and stockholders who have acquired
their stock upon the exercise of employee options or otherwise as consideration.
In addition, the discussion below does not consider the effect of any applicable
state, local or foreign tax laws. The discussion below is based upon current
provisions of the Internal Revenue Code of 1986, as amended, currently
applicable treasury regulations promulgated thereunder, and judicial and
administrative decisions and rulings. Future legislative changes, judicial
administrative changes or interpretations could alter or modify the statements
and conditions set forth herein, and these changes or interpretations could be
retroactive and could affect the tax consequences to the stockholders of
Harding.

         THIS DISCUSSION DOES NOT ADDRESS ALL ASPECTS OF FEDERAL INCOME TAXATION
THAT MAY BE IMPORTANT TO A STOCKHOLDER BASED ON SUCH HOLDER'S PARTICULAR
CIRCUMSTANCES AND DOES NOT ADDRESS ANY ASPECT OF STATE, LOCAL OR FOREIGN TAX
LAWS. BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER, EACH STOCKHOLDER IS URGED TO
CONSULT


                                      -29-

<PAGE>   37

SUCH STOCKHOLDER'S OWN TAX ADVISOR TO DETERMINE THE APPLICABILITY OF THE RULES
DISCUSSED BELOW TO SUCH STOCKHOLDER AND THE PARTICULAR TAX EFFECTS OF THE
MERGER, INCLUDING THE APPLICATION AND EFFECT OF STATE, LOCAL AND OTHER TAX LAWS.
FOREIGN STOCKHOLDERS SHOULD CONSULT WITH LOCAL ADVISORS AS TO THE TAX
CONSEQUENCES OF THE MERGER.

         The receipt of cash pursuant to the merger (including any cash amounts
received by dissenting stockholders pursuant to the exercise of appraisal
rights) will be a taxable transaction for federal income tax purposes under the
Internal Revenue Code of 1986, as amended. In general, for federal income tax
purposes, a stockholder will recognize gain or loss equal to the difference
between the cash received by the stockholder pursuant to the merger agreement
and the stockholder's adjusted tax basis in the shares of common stock
surrendered pursuant to the merger agreement. Such gain or loss will be a
capital gain or loss. The rate at which any such gain will be taxed to
non-corporate stockholders (including individuals, estates and trusts) will, as
a general matter, depend upon each stockholder's holding period for the shares
of common stock at the effective time of the merger. If a non-corporate
stockholder's holding period for the shares of common stock is more than one
year, either a 20 percent or a 10 percent capital gains rate generally will
apply to such gain, depending on the amount of taxable income of such
stockholder for such year. If the stockholder's holding period for the shares of
common stock is one year or less, such gain will be taxed at the same rates as
ordinary income. Capital loss generally is deductible only to the extent of
capital gain plus ordinary income of up to $3,000. Net capital loss in excess of
$3,000 may be carried forward to subsequent taxable years.

         For corporations, capital losses are allowed only to the extent of
capital gains, and net capital gain is taxed at the same rate as ordinary
income. Corporations generally may carry capital losses back up to three years
and forward up to five years.

         Payment in connection with the merger may be subject to "backup
withholding" at a 31% rate. Backup withholding generally applies if the
stockholder fails to furnish such stockholder's social security number or other
taxpayer identification number ("TIN"), or furnishes an incorrect TIN. Backup
withholding is not an additional tax but merely a creditable advance payment
which may be refunded to the extent it results in an overpayment of tax,
provided that specific required information is furnished to the Internal Revenue
Service. Certain persons generally are exempt from backup withholding, including
corporations and financial institutions. Certain penalties apply for failure to
furnish correct information and for failure to include reportable payments in
income. Stockholders should consult with their own tax advisers as to the
qualifications and procedures for exemption from backup withholding.

DELISTING AND DEREGISTRATION OF HARDING COMMON STOCK

         Harding common stock currently is traded on the Nasdaq National Market
under the symbol "HRDG." Upon consummation of the merger, Harding common stock
will be delisted from the Nasdaq National Market and deregistered under the
Securities Exchange Act of 1934, as amended. Following the merger, Harding
stockholders will be instructed to exchange their outstanding stock certificates
for the merger consideration. See "The Merger Agreement--Procedures for Exchange
of Stock Certificates" on page 31.


                                      -30-
<PAGE>   38


                              THE MERGER AGREEMENT

         The following is a brief summary of the material provisions of the
merger agreement, a copy of which is attached as Appendix A to this document and
is incorporated in this document by reference. The summary is not complete and
is qualified in its entirety by reference to the merger agreement. We urge all
stockholders of Harding to read the merger agreement in its entirety for a more
complete description of the terms and conditions of the merger.

THE MERGER

         The merger agreement provides that CETCAM Acquisition Corporation will
be merged with and into Harding. At the time of the merger, the separate
corporate existence of CETCAM Acquisition Corporation will cease and Harding
will continue as the surviving corporation and as a wholly-owned subsidiary of
MACTEC. The merger will become effective at the time a certificate of merger is
filed with the Secretary of State of the State of Delaware or at such later time
as agreed to by Harding and MACTEC and established under the certificate of
merger.

TREATMENT OF HARDING COMMON STOCK

         At the time of the merger, each issued and outstanding share of Harding
common stock other than shares held by stockholders who are entitled to and who
have perfected their appraisal rights will be converted into the right to
receive $11.50 in cash, without interest, subject to reduction for applicable
withholding or stock transfer taxes.

PROCEDURES FOR EXCHANGE OF STOCK CERTIFICATES

         As of the time of the merger, MACTEC will cause to be deposited with a
paying agent, for the benefit of holders of Harding common stock, cash
sufficient to pay the aggregate merger consideration in exchange for the shares
of Harding common stock outstanding immediately prior to the effective time of
the merger upon due surrender of the certificates representing Harding common
stock. Promptly after the effective time of the merger, the paying agent will
mail to each record holder of Harding common stock a letter of transmittal and
instructions for use in effecting the surrender of the certificates for payment.
Holders of certificates who surrender their certificates to the paying agent
together with a duly executed letter of transmittal will be entitled to receive
$11.50 in cash per share payable to the holders thereof, without interest,
subject to reduction for applicable withholding or stock transfer taxes. The
surrendered Harding certificates will be canceled.

         After the effective time of the merger, there will be no further
transfers on the stock transfer books of Harding of shares of Harding common
stock that were outstanding immediately prior to the effective time of the
merger.

         Any portion of the cash deposited with the paying agent that remains
unclaimed by Harding stockholders for 180 days after the effective time of the
merger will be returned to MACTEC. After such 180-day period, any Harding
stockholder must look only to MACTEC for payment of the consideration under the
merger agreement.


                                      -31-
<PAGE>   39

         MACTEC is entitled to deduct and withhold from the consideration
otherwise payable to any holder of Harding common stock the amounts it is
required to deduct and withhold with respect to the payment of such
consideration under the Internal Revenue Code or any provision of state, local
or foreign tax law. Any amounts withheld will be treated as having been paid to
the holder of the shares of Harding common stock.

         If any Harding certificate is lost, stolen or destroyed, the Harding
stockholder must provide an appropriate affidavit of that fact. MACTEC may
require the owner of such lost, stolen or destroyed Harding certificate to post
a bond in a customary amount as indemnity against any claim that may be made
against MACTEC with respect to the Harding certificate alleged to have been
lost, stolen or destroyed.

         HOLDERS OF HARDING COMMON STOCK SHOULD NOT SEND IN THEIR HARDING
CERTIFICATES TO THE PAYING AGENT UNTIL THEY RECEIVE A TRANSMITTAL FORM FROM THE
PAYING AGENT.

REPRESENTATIONS AND WARRANTIES

         The merger agreement contains representations and warranties made by
Harding, relating to, among other things:

         o        its and its subsidiaries' organization, good standing and
                  qualification;

         o        its capitalization;

         o        its corporate power and authority to execute, deliver and
                  perform its obligations under the merger agreement and to
                  consummate the merger;

         o        governmental or regulatory consents and approvals required for
                  the consummation of the merger;

         o        its reports and financial statements, the absence of certain
                  changes since November 30, 1999 and the absence of undisclosed
                  liabilities;

         o        litigation;

         o        employee benefit plans and labor matters;

         o        compliance with laws and permits;

         o        inapplicability of any takeover statute to the merger or the
                  transactions contemplated by the merger agreement;

         o        environmental matters;

         o        taxes;



                                      -32-
<PAGE>   40

         o        existence of necessary permits;

         o        intellectual property and Year 2000 compliance matters;

         o        material and government contracts;

         o        payments resulting from the merger;

         o        title to assets and absence of liens;

         o        interested party transactions;

         o        insurance matters; and

         o        brokers' and finders' fees.

         In addition, the merger agreement contains representations and
warranties made by MACTEC and Merger Sub relating to, among other things:

         o        their organization, good standing and qualification;

         o        their corporate power and authority to execute, deliver and
                  perform their obligations under the merger agreement and to
                  consummate the merger;

         o        governmental or regulatory consents and approvals required for
                  the consummation of the merger;

         o        financing; and

         o        brokers and finders.

COVENANTS PENDING THE MERGER

         Operational Covenants. The merger agreement provides for covenants of
the Harding pending the merger, including covenants of Harding restricting the:

         o        amendment of corporate governance documents;

         o        issuance of securities;

         o        failing to maintain permits;

         o        declaration and payment of dividends and changes in share
                  capital;

         o        making of tax elections;

         o        incurrence of indebtedness and the acquisition of equity
                  interests;


                                      -33-
<PAGE>   41

         o        waiving or relinquishing of material rights;

         o        making of capital expenditures;

         o        changing accounting principles or practices;

         o        entering into, amendment or termination of material contracts;

         o        taking any action or allowing any event to occur that would
                  make Harding's representations or warranties materially
                  incorrect; and

         o        changes in compensation and employee benefit plans.

         Acquisition Proposals. The merger agreement provides that Harding will
not, and will not permit or cause any of its subsidiaries or any of their
representatives to, directly or indirectly, encourage, solicit, participate in
or initiate discussions or negotiations with or provide information to any
person concerning any actual or potential alternative proposal. The term
"alternative proposal" means, any inquiry, proposal or offer with respect to
any:

         o        merger, consolidation, business combination, sale of all or
                  substantially all assets, recapitalization, liquidation,
                  dissolution or similar transaction involving Harding or any of
                  its subsidiaries; or

         o        the purchase of a material portion of the assets of Harding
                  and its subsidiaries taken as a whole or the purchase of or
                  tender offer for 20% or more of the equity securities of
                  Harding.

         However, the terms of the merger agreement do not prevent Harding or
its Board of Directors from:

         o        complying with Rule 14e-2 promulgated under the Exchange Act
                  with regard to an alternative proposal, or

         o        (1) providing information in response to a request therefor by
                  a person who has made an unsolicited bona fide acquisition
                  proposal to acquire more than 50% of the voting equity
                  securities of Harding or all or substantially all of the
                  assets of Harding that the Board determines in its good faith
                  judgment (after consultation with a financial advisor of
                  nationally recognized reputation) is reasonably likely to be
                  completed and more favorable to Harding's shareholders from a
                  financial point of view than the merger with Merger Sub and
                  for which financing is then committed or which is as likely to
                  be obtained as is MACTEC's financing (a "superior proposal");
                  (2) engaging in any negotiations or discussions with any
                  person who has made a superior proposal; or (3) terminating
                  the merger agreement and recommending the superior proposal to
                  the stockholders of Harding, if and only to the extent that
                  the Harding Board of Directors determines in good faith after
                  consultation with outside legal counsel that such action is



                                      -34-
<PAGE>   42

                  necessary in order for the directors to comply with their
                  respective fiduciary duties under applicable law.

         Harding has agreed to give three business days' written notice to
MACTEC of any superior proposal and to negotiate with MACTEC in good faith
during such three business day period to enable MACTEC to negotiate a modified
proposal during that period such that the superior proposal no longer
constitutes a superior proposal. Harding has agreed to cease and cause to be
terminated any existing activities, discussions or negotiations with any parties
conducted heretofore with respect to any of the foregoing.

         Stockholders Meetings. Pursuant to the merger agreement, Harding has
agreed to convene a meeting of the holders of common stock of Harding to
consider and vote upon the approval and adoption of the merger agreement. In
addition, Harding has agreed that the Harding Board of Directors, except as
otherwise described with respect to superior proposals above, will recommend
approval of the merger agreement and will not withdraw or modify such
recommendation.

         Filings; Other Actions; Notification. MACTEC and Harding have agreed to
cooperate with one another to prepare and file this proxy statement with the SEC
and respond promptly to any SEC comments. MACTEC and Harding have also agreed to
promptly file notifications under the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended, and to respond as promptly as practicable to any
inquiries received from the FTC and the Justice Department for additional
information or documentation.

         In addition, Harding and MACTEC each has agreed to cooperate with the
other and use reasonable best efforts to cause to be done all things, necessary,
proper or advisable to consummate and make effective as promptly as practical
the transactions contemplated by the merger agreement.

         Nasdaq Listing. Action will be taken after the merger becomes effective
to cause the shares of common stock of Harding to be de-listed from the Nasdaq
National Market and de-registered under the Exchange Act.

         Stock Options and Stock Plans. The merger agreement provides that prior
to the effective time of the merger, Harding will take necessary actions to
cause each outstanding option to purchase Harding common stock under each of the
Harding stock plans to fully vest, subject to the successful completion of the
merger. Thereafter, the holder of such option, upon surrender of the option,
will receive an amount in cash equal to the excess, if any, of the merger
consideration over the exercise price per share of such option multiplied by the
number of shares of common stock previously subject to such option, less any
required withholding taxes. Harding will take the actions necessary to cause
Harding's Employee Stock Purchase Plan and Harding's Non-Qualified Deferred
Compensation Plan and related rabbi trust and any other plans designated by
MACTEC (other than existing medical, health and dental plans) to be terminated
effective as of the effective time of the merger.

         Employee Benefits. Pursuant to the merger agreement, MACTEC has agreed
that during the period commencing at the effective time of the merger and ending
on the first


                                      -35-
<PAGE>   43

anniversary thereof, the employees of Harding and its subsidiaries will continue
to be provided with benefits that are no less favorable in the aggregate than
those benefits generally in effect with similarly situated employees of MACTEC,
and in addition has agreed to maintain Harding's existing medical, health and
dental plans in effect through December 31, 2000. To the extent that employees
of Harding and its subsidiaries become participants in any plans maintained by
MACTEC or its subsidiaries:

         o        any such employees will receive credit under such plans of
                  MACTEC or any of its subsidiaries for service with Harding or
                  any of its subsidiaries or predecessors (to the extent service
                  with such predecessors was credited under the Harding
                  compensation and benefit plans) prior to the effective time of
                  the merger for the purpose of determining eligibility and
                  vesting, except to the extent such treatment will result in
                  duplication of benefits;

         o        MACTEC will, to the extent permitted under the relevant plan
                  and within MACTEC's control, cause any pre-existing condition
                  limitation and eligibility waiting period under group health
                  plans of MACTEC or any of its subsidiaries to be waived with
                  respect to such participants and their eligible dependents;
                  and

         o        MACTEC will provide each employee with credit toward payments
                  and deductibles paid prior to the plan entry date in
                  satisfying any applicable deductions and annual out-of-pocket
                  limits for expenses incurred prior to the merger.

         Expenses. The surviving corporation will pay all charges and expenses,
including those of the paying agent, in connection with the transactions
relating to the surrender of the Harding common stock in exchange for the merger
consideration. Except as otherwise provided in the merger agreement, whether or
not the merger is consummated, all costs and expenses incurred in connection
with the merger agreement, the merger and the other transactions contemplated by
the merger agreement will be paid by the party incurring such expense, except
that if the merger agreement is terminated by either MACTEC or Harding based
upon a material breach of material covenants, obligations, representations or
warranties, the other party will pay the non-breaching party's expenses in
connection with the merger agreement and the transactions contemplated by the
merger agreement in the amount of $500,000.

         Indemnification; Directors' and Officers' Insurance. The merger
agreement provides that for a period of six years after the effective time of
the merger, each present and former director and officer of Harding shall
continue to be entitled to indemnification against any costs or expenses
(including reasonable attorneys' fees and advancement of expenses), judgments,
fines, losses, damages or liabilities incurred in connection with any claim,
action, suit, proceeding or investigation arising out of matters existing or
occurring at or prior to the effective time of the merger, to the fullest extent
that Harding would have been permitted or required under Delaware law, its
charter or bylaws and agreements in effect on the date of the merger agreement
to indemnify such person. If the merger closes, MACTEC and Merger Sub must cause
the surviving corporation to honor the indemnification agreements in effect for
Harding's former and existing directors and officers.


                                      -36-
<PAGE>   44

         The merger agreement further provides that the surviving corporation
will maintain Harding's existing directors' and officers' liability insurance
(or directors' and officers' liability insurance that is not less advantageous)
for a period of six years after the effective time of the merger, so long as the
annual premium therefor would not be in excess of 150% of the last annual
premium paid for the insurance prior to the date of the merger agreement.
However, if the existing directors' and officers' insurance or insurance that is
not less advantageous cannot be acquired during the six-year period for not in
excess of 150% of the last annual premium paid for the insurance prior to the
date of the merger agreement, then the surviving corporation will obtain as much
directors' and officers' insurance as can be obtained for the remainder of such
period for a premium not in excess (on an annualized basis) of 150% of the last
annual premium paid for the insurance prior to the date of the merger agreement.

CONDITIONS TO THE MERGER

         The respective obligations of each party to effect the merger are
subject to the satisfaction or waiver of the following conditions:

         o        the merger agreement shall have been adopted by Harding's
                  stockholders;

         o        no statute, rule, regulation, executive order, decree, ruling
                  or injunction shall have been enacted, entered, promulgated or
                  enforced by any court or governmental entity of competent
                  jurisdiction and be in effect which prohibits, restrains,
                  enjoins or restricts the consummation of the merger; and

         o        any waiting period under the Hart-Scott-Rodino Act shall have
                  terminated or expired.

         The obligations of MACTEC and Merger Sub to effect the merger are also
subject to the waiver by MACTEC or satisfaction at or prior to the effective
time of the following conditions:

         o        Harding shall have performed in all material respects each of
                  its obligations under the merger agreement required to be
                  performed by it at or prior to the effective time of the
                  merger;

         o        there shall not have been any regulation, legislation,
                  statute, rule, injunction, judgment or other promulgated,
                  enacted, entered or enforced or deemed applicable to the
                  merger by any government entity and be in effect (other than
                  the routine application to the merger of waiting periods under
                  the Hart-Scott-Rodino Act), that in the reasonable judgment of
                  MACTEC prohibits or limits or seeks to prohibit or limit the
                  ownership or operation by MACTEC or Merger Sub or any other
                  affiliate of MACTEC of all or any portion of the business or
                  assets of Harding and its subsidiaries or of MACTEC or Merger
                  Sub or any other affiliate of MACTEC or compels or seeks to
                  compel MACTEC or Merger Sub or any other affiliate of MACTEC
                  to dispose of or to hold separately all or any portion of the
                  business or assets of Harding or any of its subsidiaries or of
                  MACTEC or Merger Sub or any other affiliate of MACTEC, or
                  imposes or seeks


                                      -37-
<PAGE>   45

                  to impose any limitation on MACTEC or Merger Sub or any other
                  affiliate of MACTEC to conduct their business or own such
                  assets;

         o        there shall have been instituted or pending any action,
                  proceeding or counterclaim by any governmental entity,
                  challenging the consummation of the merger, or seeking to,
                  directly or indirectly, result in any of the consequences
                  referred to in the preceding bulletpoint;

         o        no change in or effect on the business, assets, liabilities,
                  results of operations or condition of Harding or any of its
                  subsidiaries shall have occurred that has been or could
                  reasonably be expected to be materially adverse to Harding and
                  its subsidiaries taken as a whole or prevent, materially delay
                  or impair the ability of Harding to consummate the
                  transactions contemplated by the merger agreement;

         o        Harding shall not have materially breached any of its material
                  representations or warranties in the merger agreement (without
                  giving effect to any limitation as to materiality or material
                  adverse effect in such representations and warranties);

         o        there shall not have occurred (i) any general suspension of
                  trading in, or limitation on prices for, securities on any
                  national securities exchange or in the over-the-counter market
                  in the United States, (ii) any limitation (whether or not
                  mandatory) by any Governmental Entity on, or other event or
                  circumstances that materially and adversely affects, the
                  extension of credit by banks or other lending institutions,
                  (iii) any banking moratorium declared by New York, Texas or
                  United States authorities, any material adverse change in the
                  market for syndicated facilities similar in nature to the
                  credit facilities of MACTEC or any material disruption of, or
                  material adverse change in, financial, banking or capital
                  markets generally, in each case as determined by MACTEC in its
                  sole reasonable discretion, (iv) a commencement of a war,
                  armed hostilities or other national or international crisis
                  involving the United States or (v) in the case of any of the
                  foregoing existing at the time of the execution of the merger
                  agreement, a material acceleration or worsening thereof; and

         o        Harding shall have $14.5 million of available cash prior to
                  payment of (i) amounts payable to optionholders of Harding,
                  and (ii) transaction fees and expenses incurred by Harding in
                  connection with the transactions contemplated by the merger
                  agreement.

         The obligation of Harding to effect the merger is also subject to the
satisfaction or waiver by Harding at or prior to the effective time of the
merger of the following conditions:

         o        each of MACTEC and Merger Sub shall have performed in all
                  material respects each of its obligations under the merger
                  agreement required to be performed by it at or prior to the
                  effective time of the merger; and

         o        MACTEC and Merger Sub shall not have materially breached any
                  of their material representations or warranties in the merger
                  agreement (without giving


                                      -38-
<PAGE>   46

                  effect to any limitation as to materiality or material adverse
                  effect in such representations and warranties).

TERMINATION

         By Mutual Consent. The merger agreement may be terminated and the
merger may be abandoned at any time prior to the effective time of the merger,
whether before or after the approval by stockholders of Harding, by mutual
written consent duly authorized by the Boards of directors of Harding and
MACTEC.

         The merger agreement may be terminated and the merger may be abandoned
at any time prior to the effective time of the merger, whether before or after
the approval by stockholders of Harding, by either MACTEC or Harding if:

         o        a governmental entity shall have issued an order, decree or
                  ruling or taken any other action, in any case having the
                  effect of permanently restraining, enjoining or otherwise
                  prohibiting the merger, which order, decree, ruling or other
                  action is final and nonappealable; provided, that the party
                  seeking to terminate the merger agreement shall have used its
                  reasonable efforts to remove, lift, vacate or reverse such
                  order, decree or ruling;

         o        the Board of Directors of Harding has recommended, or Harding
                  has entered into an acquisition agreement with respect to, an
                  alternative proposal except that Harding may not exercise this
                  right unless the acquisition agreement is with respect to a
                  superior proposal, the Company has strictly complied with the
                  terms and procedures set forth in the merger agreement and
                  prior to such termination Harding has paid the termination fee
                  provided for in the merger agreement; or

         o        if the merger shall not have been consummated by August 31,
                  2000; provided, however, that the right to terminate the
                  merger agreement is not available to any party that is then in
                  material breach of any of its material covenants, obligations,
                  representations or warranties (without giving effect to any
                  limitation as to materially or material adverse effect in such
                  representations and warranties) or if such party's material
                  breach has been the cause of, or resulted in, the failure of
                  the merger to occur on or before the August 31, 2000.

         The merger agreement may be terminated and the merger may be abandoned
at any time prior to the effective time of the merger, whether before or after
the approval by stockholders of Harding, by MACTEC if:

         o        Harding shall have failed to include in the Proxy Statement
                  the recommendation of the Board of Directors of MACTEC that
                  the stockholders of Harding approve and adopt the merger
                  agreement;

         o        the Board of Directors of Harding or any committee thereof
                  shall have (A) withdrawn or modified or publicly proposed to
                  withdraw or modify in a manner adverse to MACTEC or Merger Sub
                  its approval or recommendation of


                                      -39-
<PAGE>   47

                  the merger agreement; (B) unanimously approved or recommended
                  or publicly proposed to approve or recommend any alternative
                  proposal; (C) resolved to effect any of the foregoing; or (D)
                  failed to reaffirm publicly and unconditionally its
                  recommendation to the Harding's stockholders to approve and
                  adopt the merger agreement and the transactions contemplated
                  thereby and unconditionally reject any alternative proposal
                  within five business days after MACTEC's written request to do
                  so; or

         o        Harding is in material breach of any of its material
                  covenants, obligations, representations or warranties in the
                  merger agreement (without giving effect to any limitation as
                  to materiality or material adverse effect in the
                  representations and warranties); provided that if such breach
                  is curable through the exercise of Harding's commercially
                  reasonable efforts, MACTEC may not terminate the merger
                  agreement on this basis unless such breach is not cured on or
                  prior to the date that is 20 days after written notice of such
                  breach is given by MACTEC to Harding.

         The merger agreement may be terminated and the merger may be abandoned
at any time prior to the effective time of the merger, whether before or after
the approval by stockholders of Harding, by Harding if MACTEC is in material
breach of any of its material covenants, obligations, representations or
warranties in the merger agreement (without giving effect to any limitation as
to materiality or material adverse effect in the representations and
warranties); provided that if such breach is curable through the exercise of
MACTEC's commercially reasonable efforts, Harding may not terminate the merger
agreement on this basis unless such breach is not cured on or prior to the date
that is 20 days after written notice of such breach is given by Harding to
MACTEC.

TERMINATION FEES

         The merger agreement provides the following with respect to
reimbursement of expenses and the payment of expenses in the event of breach of
representations, warranties and agreements contained in the merger agreement:

         o        Harding will reimburse MACTEC in the amount of $500,000 for
                  all its costs and expenses in connection with the merger
                  agreement if the merger agreement has been terminated by
                  MACTEC based upon material breach by Harding of its material
                  covenants, obligations, representations or warranties and
                  MACTEC will reimburse Harding in an amount of $500,000 for
                  such expenses if the agreement has been terminated by Harding
                  based upon a material breach by MACTEC of its material
                  covenants, obligations, representations or warranties,
                  provided that the party seeking reimbursement is not in
                  material breach of any of its material covenants, obligations,
                  representations or warranties.

         o        If the merger agreement is terminated by reason of the Board
                  of Directors of Harding recommending, or Harding entering
                  into, an acquisition agreement with respect to an alternative
                  proposal or by reason of the withdrawal or modification in a
                  manner adverse to MACTEC or Merger Sub of the Board's approval
                  or



                                      -40-
<PAGE>   48

                  recommendation of the merger agreement or certain other
                  actions provided for in the merger agreement that may have
                  that same effect, Harding is required to pay MACTEC a
                  termination fee of $2,500,000.

         o        If the merger agreement is terminated based upon Harding's
                  material breach of its material covenants, obligations,
                  representations or warranties under the merger agreement and
                  (i) Harding is unable to prove by a preponderance of the
                  evidence that the breach by Harding was not willful and prior
                  to the first anniversary of such termination, Harding enters
                  into a definitive agreement with respect to an alternative
                  proposal or an alternative proposal is consummated, or (ii)
                  Harding proves by a preponderance of the evidence that the
                  breach by Harding was not willful and prior to the first
                  anniversary of such termination, Harding enters into a
                  definitive agreement with respect to an alternative proposal
                  or an alternative proposal is consummated and the
                  consideration per Share expected to be paid in connection with
                  such transaction is an amount equal to (x) $11.50, less (y)
                  the amount determined by dividing the termination fee by the
                  number of Shares then outstanding, Harding shall pay MACTEC
                  the $2,500,000 termination fee less expenses previously
                  reimbursed.

AMENDMENT

         The Agreement may be amended by action taken by Harding, MACTEC and
Merger Sub at any time before or after adoption of the merger agreement by the
stockholders of Harding (if required by applicable law); provided, however,
that, after any such approval by the stockholders of the Company, no amendment
shall be made that would adversely affect the stockholders of Harding.

EXTENSION; WAIVER

         At any time prior to the effective time of the merger, each party may
(i) extend the time for the performance of any of the obligations or other acts
of the other party, (ii) waive any inaccuracies in the representations and
warranties of the other party contained in the merger agreement or in any
document, certificate or writing delivered pursuant thereto or (iii) provided
the same does not adversely affect the stockholders of Harding, waive compliance
by the other party with any of the covenants and agreements contained herein.

APPRAISAL RIGHTS

         Notwithstanding any provision of the merger agreement to the contrary,
any shares of common stock held by a holder who does not vote to approve the
merger and complies with all the provisions of the Delaware General Corporation
Law concerning the right to dissent from the merger and require payment of fair
value shall not be converted into the right to receive the merger consideration
pursuant to the merger agreement, but the holder shall only be entitled to the
right to receive such consideration as may be determined to be due to such
holder pursuant to the Delaware General Corporation Law. If a holder of shares
of common stock who demands appraisal of such shares under the Delaware General
Corporation Law withdraws his or her demand or fails to perfect or otherwise
loses his or her right of appraisal, his or her shares will be


                                      -41-
<PAGE>   49

deemed to be converted as of the effective time of the merger into the right to
receive the merger consideration.

         The following is a summary of the principal provisions of Section 262
and does not purport to be a complete description. A copy of Section 262 is
attached to this proxy statement as Appendix C. Failure to take any action
required by Section 262 will result in a termination or waiver of a
stockholder's rights under Section 262.

         A stockholder electing to exercise appraisal rights must (a) deliver to
Harding, before the Harding stockholders vote on the merger agreement, a written
demand for appraisal that is made by or on behalf of the person who is the
holder of common stock for which appraisal is demanded (b) not vote in favor of
adopting the merger agreement. The demand must be delivered to Harding Lawson
Associates Group, Inc. at 707 Seventeenth Street, Suite 2400, Denver, CO 80202,
Attention: Secretary. A proxy or vote against adopting the merger agreement does
not constitute a demand. A stockholder electing to take such action must do so
by a separate written demand that reasonably informs Harding of the name and
mailing address of the holder of record and of such stockholder's intention to
demand appraisal of such holder's common stock. Because a proxy left blank will,
unless revoked, be voted FOR adoption and approval of the merger agreement, a
stockholder electing to exercise appraisal rights who votes by proxy must not
leave the proxy blank but must vote AGAINST adoption of the merger agreement or
ABSTAIN from voting for or against adoption of the merger agreement, in addition
to making a separate demand for appraisal. If the demand is not physically
received by Harding before the special meeting, irrespective of when mailed,
then the demand will not be considered mailed.

         Only the holder of record of common stock is entitled to demand
appraisal rights for common stock registered in that holder's name. The demand
must be executed by or for the holder of record, fully and correctly, as the
holder's name appears on the holder's stock certificates. If common stock is
owned of record in a fiduciary capacity, such as by a trustee, guardian or
custodian, the demand should be executed in that capacity. If common stock is
owned of record by more than one person, as in a joint tenancy or tenancy in
common, the demand should be executed by or for all owners. An authorized agent,
including one of two or more joint owners, may execute the demand for appraisal
for a holder of record; however, the agent must identify the owner or owners of
record and expressly disclose the fact that, in executing the demand, the agent
is acting as agent for the owner or owners of record. A holder of record, such
as a broker, who holds common stock as nominee for beneficial owners may
exercise a holder's right of appraisal with respect to common stock held for all
or less than all of such beneficial owners. In such case, the written demand
should set forth the number of shares of common stock covered by the demand.
Where no number of shares of common stock is expressly mentioned, the demand
will be presumed to cover all shares of common stock standing in the name of the
holder of record.

         Within 10 days after the effective time of the merger, Harding will
send notice of the effectiveness of the merger to each person who prior to the
effective time of the merger satisfied the foregoing conditions. Any stockholder
entitled to appraisal rights may, within 20 days after the date of the mailing
of the notice, demand in writing from Harding the appraisal of his or her
Harding shares.



                                      -42-
<PAGE>   50

         Within 120 days after the effective time of the merger, Harding or any
stockholder who has satisfied the foregoing conditions may file a petition in
the Delaware Court of Chancery demanding a determination of the fair value of
the common stock held by all stockholders entitled to appraisal. Harding does
not currently intend to file an appraisal petition and stockholders seeking to
exercise appraisal rights should not assume that Harding will file a petition to
appraise the value of their common stock or that Harding will initiate any
negotiations with respect to the "fair value" of such common stock. Accordingly,
holders of common stock should initiate all necessary action to perfect their
appraisal rights within the time periods prescribed in Section 262.

         Within 120 days after the effective time of the merger, any stockholder
who has complied with the requirements for exercise of appraisal rights, as
discussed above, is entitled, upon written request, to receive from Harding a
statement setting forth the aggregate number of shares of common stock not voted
in favor of the merger and with respect to which demands for appraisal have been
made and the aggregate number of holders of such common stock. Harding is
required to mail such statement within 10 days after it receives a written
request to do so, or within 10 days after expiration of the time for delivery of
demands for appraisal under Section 262, whichever is later.

         If a petition for an appraisal is timely filed and a copy is delivered
to Harding, Harding must then provide the Delaware Court of Chancery with a list
of the stockholders who have demanded appraisal rights. After notice to those
stockholders, the Court can conduct a hearing to determine the stockholders
entitled to appraisal rights. The Court may require stockholders who have
demanded payment for their shares to submit their stock certificates to the
Court for a notation thereon, and if any stockholder fails to comply with the
requirement, the Court may dismiss the proceedings as to such stockholder. At a
hearing on the petition, the Court will determine the stockholders entitled to
appraisal rights and will appraise the common stock owned by such stockholders,
determining its "fair value" exclusive of any element of value arising from the
accomplishment or expectation of the merger and will determine the amount of
interest, if any, to be paid upon the value of the common stock of the
stockholders entitled to appraisal. Any such judicial determination of the "fair
value" of common stock could be based upon considerations other than or in
addition to the price paid in the merger and the market value of common stock,
including asset values, the investment value of the common stock and any other
valuation considerations generally accepted in the investment community. The
value so determined for common stock could be more than, less than or the same
as the consideration paid pursuant to the merger agreement. The Court may also
order that all or a portion of any stockholder's expenses incurred in connection
with an appraisal proceeding, including, without limitation, reasonable
attorneys' fees and fees and expenses of experts utilized in the appraisal
proceeding, be charged pro rata against the value of all common stock entitled
to appraisal.

         Any stockholder who has duly demanded an appraisal in compliance with
Section 262 will not, after the effective time of the merger, be entitled to
vote the shares subject to such demand for any purpose or be entitled to
dividends or other distributions on that common stock (other than those payable
or deemed to be payable to stockholders of record as of a date prior to the
effective time of the merger).



                                      -43-
<PAGE>   51

         Holders of common stock lose the right to appraisal if no petition for
appraisal is filed within 120 days after the effective time of the merger, or if
a stockholder delivers to Harding a written withdrawal of such stockholder's
demand for an appraisal and an acceptance of the merger, except that any such
attempt to withdraw made more than 60 days after the effective time of the
merger requires Harding's written approval. If appraisal rights are not
perfected or a demand for appraisal rights is withdrawn, a stockholder will be
entitled to receive the consideration otherwise payable pursuant to the merger
agreement.

         If an appraisal proceeding is timely instituted, such proceeding may
not be dismissed without the approval of the Delaware Court of Chancery as to
any stockholder who has perfected a right of appraisal.

         Failure by the stockholder to take any required step to perfect
appraisal rights may result in termination of the appraisal rights. Because the
appraisal provisions of the Delaware General Corporation law are so complex,
stockholders who are considering exercising their appraisal rights under Section
262 should consult with their legal advisors.

         The merger agreement requires that Harding give MACTEC (a) prompt
notice of any demands for appraisal of any shares of common stock received by
Harding and (b) the opportunity to participate in and control all negotiations
and proceedings with respect to demands for appraisal under the Delaware General
Corporation Law. The merger agreement further provides that Harding shall not,
without the prior written consent of MACTEC, make any payment with respect to
any demands for appraisal of common stock or offer to settle or otherwise
negotiate any such demands.




                                      -44-
<PAGE>   52

                         INFORMATION CONCERNING HARDING

         Harding provides comprehensive environmental engineering,
infrastructure and construction services. Environmental services may be related
to the development and implementation of environmental management systems for
maintaining compliance with environmental regulations, limiting the potential
for unplanned discharges, and managing, minimizing or eliminating waste streams
from industrial and agricultural operations, and the assessment and remediation
of contaminated sites. Infrastructure services may be related to civil,
transportation and geotechnical engineering services, and services during
construction, either independently or in support of Harding's environmental,
waste management, and civil services. Construction services may be related to
environmental remediation and heavy construction, which could include the
capping of landfills and construction of water/wastewater treatment facilities.

         The services of Harding are provided to private and public sector
clients through a staff of nearly 1,200 professional and support personnel
located in 40 U.S. cities in Alabama, Alaska, Arizona, California, Colorado,
Connecticut, Florida, Hawaii, Illinois, Maine, Massachusetts, Michigan,
Missouri, Montana, Nevada, New Jersey, New Mexico, North Carolina, Oregon,
Pennsylvania, Tennessee, Texas, Utah, Virginia and Washington.

         Consulting and engineering services are provided by Harding to clients
through its staff of engineers and scientists who possess a diverse range of
education and professional experience. Project teams are organized to utilize
applicable talent from Harding's staff. Qualified subcontractors are utilized to
provide special technical resources that the Company either does not possess or
has determined not to develop internally in specific geographic area.

                SECURITY OWNERSHIP OF PRINCIPAL STOCKHOLDERS AND
                             MANAGEMENT OF HARDING

         The following table sets forth certain information regarding the
ownership of Common Stock of Harding as of April 4, 2000 by (i) all persons who
to the knowledge of Harding beneficially own five percent or more of the
outstanding shares of the Common Stock, (ii) each director of Harding, (iii)
Harding's current executive officers, and (iv) all Harding's directors and
current executive officers as a group. There are no family relationships among
the directors and executive officers of Harding. To Harding's knowledge, each
person has sole investment and voting powers with respect to the shares shown as
beneficially owned, except as otherwise indicated. The Common Stock of Harding
is the only class of equity securities of Harding outstanding.



                                      -45-
<PAGE>   53


<TABLE>
<CAPTION>
                                                                          Shares
                                                                       Beneficially     Percent of
Name and Address of 5% Beneficial Owners                                   Owned           Class
- ---------------------------------------------------------------------------------------------------
<S>                                                                   <C>               <C>
Heartland Advisors, Inc. (1)                                               564,500          11.1
Lionheart Group, Inc. (2)                                                  558,400          10.9
Hillson Partners Limited Partnership (3)                                   371,028           7.3
Artisan Partners Limited Partnership (4)                                   369,500           7.2
Dimensional Fund Advisors Inc. (5)                                         366,950           7.2
Franklin Advisory Services, LLC (6)                                        365,800           7.2
The TCW Group, Inc. (7)                                                    247,700           5.0

Directors and Executive Officers

Richard D. Puntillo (8)(9)                                                  49,156           1.0
Claude Corvino (8) (9)                                                      46,950           *
Robert L. Costello, Jr.                                                     35,000           *
James M. Edgar (8)(9)                                                       25,571           *
Stuart F. Platt (8)(9)                                                      18,718           *
Donald K. Stager (8)(9)                                                     17,789           *
Oliver P. Wesley (8)(9)                                                     12,952           *
Ross K. Anderson (8)(9)                                                      7,964           *
Michael D. Carroll (8)(9)                                                    7,635           *
Ann E. Massey (8)(9)                                                         3,518           *
Frank S. Waller (9)                                                            778
Valorie B. Feher                                                                 0
All directors and executive officers as a group (12) persons (10)          569,967          11.3
</TABLE>

* Represents less than one percent

(1)      As reported in a Schedule 13G as of December 31, 1999 filed on January
         26, 2000 by Heartland Advisors, Inc. whose business address is 790
         North Milwaukee Street, Milwaukee, Wisconsin 53202. Heartland Advisors,
         Inc. reports sole voting power of 171,900 shares.

(2)      As reported in a Schedule 13D filed on March 2, 2000 by Lionheart
         Group, Inc., whose business address is 230 Park Avenue, Suite 516, New
         York, New York 10169 and Acquisitor PLC, a corporation organized in the
         United Kingdom. Acquisitor PLC, whose address is Avery House, 52
         Brook's Mews, London W1Y 1LE, has an option to acquire 328,000 shares
         of Harding stock owned by Lionheart Group, Inc.

(3)      As reported in a Schedule 13D filed on March 15, 2000 by Hillson
         Partners Limited Partnership ("Hillson"), whose business address is
         6900 Wisconsin Avenue, Suite 501, Bethesda, MD 20815. The general
         partner of Hillson is Hillson Financial Management, Inc., whose
         President and controlling stockholder is Daniel H. Abramowitz.


                                      -46-
<PAGE>   54

(4)      As reported in a Schedule 13G filed on February 14, 2000 by Artisan
         Partners Limited Partnership, whose business address is 1000 North
         Water Street, Suite 1770, Milwaukee, WI 53202. Artisan Partners Limited
         Partnership filed as a group with Artisan Investment Corporation (its
         general partner), Andrew A. Ziegler and Charlene Murphy Ziegler.

(5)      As reported in a Schedule 13G as of December 31, 1999 filed on February
         3, 2000 by Dimensional Fund Advisors, Inc., whose business address is
         1299 Ocean Avenue, 11th Floor, Santa Monica, CA 90401. All of the
         shares are owned by advisory clients of Dimensional Fund Advisors, Inc.

(6)      As reported in a Schedule 13D filed on March 6, 2000 by Franklin
         Resources, Inc., Advisory Services, LLC, Charles B. Johnson and Rupert
         H. Johnson, Jr., whose business address is 777 Mariners Island
         Boulevard, San Mateo, CA 94403-7777. Franklin Resources, Inc. is the
         parent holding company and Charles B. Johnson and Rupert H. Johnson,
         Jr. are principal shareholders of the parent holding company, and
         Franklin Advisory Services, Inc., an investment advisor, has sole
         voting and dispositive power with respect to such shares.

(7)      As reported in a Schedule 13G as of December 31, 1999 filed on February
         14, 2000 by The TCW Group, Inc., and Robert Day, whose business address
         is 865 Figueroa Street, Los Angeles, CA 90017. The TCW Group, Inc. is
         the parent company of Trust Company of the West. Robert Day may be
         deemed to control The TCW Group, Inc.

(8)      Includes shares subject to options that are exercisable on or before
         June 3, 2000 in the following amounts for the directors and executive
         officers listed: 9,154; 24,125; 4,000; 8,077; 4,000; 12,250; 2,000;
         6,750; and 3,500 for Messrs. Puntillo, Corvino, Edgar, Platt, Stager,
         Wesley, Anderson, Carroll and Ms. Massey, respectively.

(9)      Includes shares held in trust in one or more Company retirement plans
         in the following amounts for the directors and officers listed: 34,502;
         3,855; 9,571; 5,141; 10,789; 302; 5,964; 619; 18 and 778 for Messrs.
         Puntillo, Corvino, Edgar, Platt, Stager, Wesley, Anderson, Carroll, Ms.
         Massey, and Mr. Waller, respectively.

(10)     Includes 39,481 shares subject to options that are exercisable on or
         before June 3, 2000, and 381,066 shares held in trust in various
         company retirement savings plans, for which the Board of Directors
         exercises voting power.


                  INFORMATION CONCERNING MACTEC AND MERGER SUB

         MACTEC, established in 1975, has evolved into one of the country's
leading environmental professional services organizations providing major
project support and leading-edge technologies. Environmental management services
provided by MACTEC include risk assessment; engineering and design; innovative
technology applications; remediation and construction; decontamination and
decommissioning; water/wastewater management; air quality management;
environmental restoration and waste management operations and maintenance;
quality assurance; regulatory compliance; and strategic environmental program
management. Environmental solutions are provided by MACTEC for multiple
government and private clients


                                      -47-
<PAGE>   55

through a network of over 40 offices nationwide and currently employs nearly
1,000 staff members.

         Merger Sub is a corporation formed by a subsidiary of MACTEC to effect
the merger. Merger Sub will not have any significant assets or liabilities or
engage in any activities other than those related to completing the merger.

                              STOCKHOLDER PROPOSALS

         Due to the contemplated consummation of the merger, Harding does not
currently expect to hold a 2000 Annual Meeting of Stockholders, as Harding
common stock will not be publicly traded after the merger. If the merger is not
consummated and such a meeting is held, stockholder proposals for inclusion in
proxy materials for such meeting would have to have been submitted to the
Secretary of Harding in writing and received at the executive offices of Harding
by April 14, 2000. Such proposals must also meet the other requirements of the
rules of the SEC relating to stockholders' proposals.

                       WHERE YOU CAN FIND MORE INFORMATION

         As required by law, Harding files annual, quarterly and special
reports, proxy statements and other information with the SEC. These reports,
proxy statements and other information contain additional information about
Harding. You may read and copy any reports, statements or other information
Harding files at the SEC's public reference rooms at 450 Fifth Street, N.W.,
Washington, D.C. 20549 and in New York, New York and Chicago, Illinois. You may
obtain information on the operation of the public reference rooms by calling the
SEC at 1-800-SEC-0330. Harding's SEC filings are also available to the public
from commercial document retrieval services and at the web site maintained by
the SEC at http://www.sec.gov. A copy of Harding's SEC filings are available
without charge to stockholders upon written request addressed to Valorie Feher,
Secretary, Harding Lawson Associates Group, Inc., 707 Seventeenth Street, Suite
2400, Denver, Colorado 80202.

         The SEC allows us to "incorporate by reference" information into this
proxy statement, which means that we can disclose important information to you
by referring you to another document filed separately with the SEC. The
information incorporated by reference is deemed to be part of this proxy
statement, except for any information superseded by information in this proxy
statement. This proxy statement incorporates by reference the documents and
amendments thereto set forth below that we have previously filed with the SEC.
These documents contain important information about our company.



                                      -48-
<PAGE>   56

<TABLE>
<CAPTION>
       SEC FILING                           PERIOD/FILING DATE
       ------------------------------       --------------------------------
<S>                                        <C>
       Annual Report on Form 10-K           Year ended May 31, 1999

       Quarterly Reports on Form 10-Q       Quarter ended August 31, 1999

                                            Quarter ended November 30, 1999

                                            Quarter ended February 29, 2000

       Current Report on Form 8-K           March 24, 2000
</TABLE>

         We are also incorporating by reference all documents that we file with
the SEC pursuant to sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
between the date of this proxy statement and the date on which the special
meeting of stockholders is held.

         You may obtain copies of the documents listed above and incorporated by
reference into this proxy statement by contacting Valorie Feher, Secretary, at
Harding Lawson Associates Group, Inc., 707 Seventeenth Street, Suite 2400,
Denver, Colorado 80202; telephone (303) 293-6100.

         If you make a timely written or oral request for a copy of any of these
documents, Harding will send you a copy, by first class mail or other equally
prompt means, within one business day of receiving your request. The copy will
be provided without charge except that, if you request a copy of any exhibit to
the particular document and that exhibit was not itself specifically
incorporated by reference into the document, Harding intends to charge $.10 per
page to defray the cost of copying the exhibit.

         We have not authorized anyone to give any information or make any
representations other than those contained in this proxy statement in connection
with the solicitation of proxies made by this proxy statement, and, if given or
made, you must not rely upon such information as having been authorized by
Harding or any other person.

         This proxy statement is dated April ___, 2000. You should not assume
that the information contained in this proxy statement is accurate as of any
date other than April ___, 2000, and the mailing of this proxy statement to you
does not create any implication to the contrary.

                              INDEPENDENT AUDITORS

         Representatives of Ernst & Young LLP, independent auditors, are
expected to be present at the Harding special meeting with an opportunity to
make a statement if they desire to do so and such representatives are expected
to be available to respond to appropriate questions.


                                      -49-


<PAGE>   57
                                   APPENDIX A


                                    AGREEMENT

                                       AND

                                 PLAN OF MERGER


<PAGE>   58


                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                             <C>
ARTICLE I       THE MERGER.......................................................................................A-1
         1.1      The Merger.....................................................................................A-1
         1.2      Effective Time; Closing........................................................................A-1
         1.3      Effects of the Merger..........................................................................A-2
         1.4      Subsequent Actions.............................................................................A-2
         1.5      Certificate of Incorporation and Bylaws........................................................A-2
         1.6      Directors and Officers.........................................................................A-2
         1.7      Conversion of Shares...........................................................................A-3
         1.8      Conversion of Acquisition's Capital Stock......................................................A-3
         1.9      Employee Options, Employee Stock Purchase Plan and Rabbi Trust.................................A-3
ARTICLE II      DISSENTING SHARES; EXCHANGE OF SHARES............................................................A-4
         2.1      Dissenting Shares..............................................................................A-4
         2.2      Exchange of Shares.............................................................................A-4
ARTICLE III     REPRESENTATIONS AND WARRANTIES OF THE COMPANY....................................................A-6
         3.1      Organization and Qualification; Subsidiaries...................................................A-6
         3.2      Capitalization.................................................................................A-7
         3.3      Authority Relative to this Agreement...........................................................A-7
         3.4      Consents and Approvals; No Violation...........................................................A-8
         3.5      SEC Filings; Financial Statements..............................................................A-9
         3.6      Absence of Certain Changes and Events..........................................................A-10
         3.7      Proxy Statement................................................................................A-11
         3.8      Material Assets................................................................................A-11
         3.9      Material Proceedings...........................................................................A-11
         3.10     Employee Benefit Plans, Etc....................................................................A-11
         3.11     Environmental Matters..........................................................................A-14
         3.12     Labor Matters..................................................................................A-16
         3.13     Intellectual Property..........................................................................A-17
         3.14     Brokers........................................................................................A-17
         3.15     Taxes..........................................................................................A-17
         3.16     Real Properties................................................................................A-18
         3.17     Compliance with Laws...........................................................................A-18
         3.18     Interested Party Transactions..................................................................A-19
         3.19     Insurance......................................................................................A-19
         3.20     Certain Business Practices.....................................................................A-19
         3.21     Y2K Compliance.................................................................................A-19
         3.22     Agreement, Contracts and Commitments...........................................................A-19
         3.23     Merger Payments................................................................................A-21
         3.24     Government Contracts...........................................................................A-21
         3.25     Certain Approvals..............................................................................A-22
         3.26     Relationships with Customers, Suppliers and Representatives....................................A-23
         3.27     Permits........................................................................................A-23
         3.28     Company Action.................................................................................A-23
         3.29     Opinion of Financial Advisor...................................................................A-23
</TABLE>

                                      (i)


<PAGE>   59


<TABLE>
<S>                                                                                                            <C>
ARTICLE IV      REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND ACQUISITION......................................A-24
         4.1      Organization..................................................................................A-24
         4.2      Authority Relative to This Agreement..........................................................A-24
         4.3      Consents and Approvals; No Violation..........................................................A-24
         4.4      Proxy Statement...............................................................................A-25
         4.5      Financing.....................................................................................A-25
         4.6      No Violation of the Margin Rules..............................................................A-25
         4.7      Brokers.......................................................................................A-25
ARTICLE V       CONDUCT OF BUSINESS PENDING THE MERGER..........................................................A-25
ARTICLE VI      ADDITIONAL AGREEMENTS...........................................................................A-28
         6.1      No Solicitation...............................................................................A-28
         6.2      Access to and Delivery of Information.........................................................A-30
         6.3      Public Announcement...........................................................................A-31
         6.4      Indemnification and Insurance.................................................................A-31
         6.5      Continuation of Benefits......................................................................A-31
         6.6      Severance Policy and Other Agreements.........................................................A-32
         6.7      Reasonable Efforts............................................................................A-32
         6.8      Proxy Statement...............................................................................A-33
         6.9      Notification of Certain Matters; Equitable Relief.............................................A-34
         6.10     Antitrust Notification........................................................................A-35
         6.11     Takeover Statutes.............................................................................A-35
ARTICLE VII     CONDITIONS TO CONSUMMATION OF THE MERGER........................................................A-35
         7.1      Conditions to Each Party's Obligation to Effect the Merger....................................A-35
         7.2      Conditions to Obligation of the Company to Effect the Merger..................................A-35
         7.3      Conditions to Obligation of Acquiror and Acquisition to Effect the Merger.....................A-36
ARTICLE VIII    TERMINATION; AMENDMENT; WAIVER..................................................................A-37
         8.1      Termination...................................................................................A-37
         8.2      Notice of Termination; Effect of Termination..................................................A-39
         8.3      Fees and Expenses.............................................................................A-39
         8.4      Amendment.....................................................................................A-40
         8.5      Extension; Waiver.............................................................................A-40
ARTICLE IX      MISCELLANEOUS...................................................................................A-40
         9.1      Non-Survival of Representations and Warranties................................................A-40
         9.2      Entire Agreement; Assignment..................................................................A-40
         9.3      Validity......................................................................................A-41
         9.4      Notices.......................................................................................A-41
         9.5      Governing Law.................................................................................A-42
         9.6      Interpretation................................................................................A-42
         9.7      Counterparts..................................................................................A-42
         9.8      Parties in Interest...........................................................................A-42
         9.9      Severability..................................................................................A-42
         9.10     Attorneys Fees................................................................................A-43
         9.11     Expenses......................................................................................A-43
         9.12     Waiver of Jury Trial..........................................................................A-43
</TABLE>


                                      (ii)

<PAGE>   60


                          AGREEMENT AND PLAN OF MERGER

     AGREEMENT AND PLAN OF MERGER (this "Agreement"), dated as of March 23,
2000, by and among MACTEC, Inc., a Colorado corporation ("Acquiror"), CETCAM
Acquisition Corporation, a Delaware corporation and a wholly owned subsidiary of
Acquiror ("Acquisition"), and Harding Lawson Associates Group, Inc., a Delaware
corporation (the "Company").

                                    RECITALS

     A. The Boards of Directors of Acquiror, Acquisition and the Company have
each determined that it is in the best interests of their respective
stockholders for Acquisition to merge with and into the Company (the "Merger"),
upon the terms and subject to the conditions set forth in this Agreement.

     B. The Board of Directors of the Company (the "Board") has approved this
Agreement and the Merger as required by applicable law.

     C. The Boards of Directors of Acquiror and Acquisition, and the sole
shareholder of Acquisition, have approved this Agreement and the Merger as
required by applicable law.

                                   AGREEMENTS

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements herein contained, Acquiror, Acquisition and the Company hereby
agree as follows:

                                    ARTICLE I

                                   THE MERGER

     1.1 The Merger. Upon the terms and subject to the satisfaction or, if
permissible, waiver of the conditions set forth in Article VII, and in
accordance with the GCL, at the Effective Time (as defined in Section 1.2),
Acquisition shall be merged with and into the Company. As a result of the
Merger, the separate corporate existence of Acquisition shall cease and the
Company shall continue as the surviving corporation of the Merger (the
"Surviving Corporation") and shall succeed to and assume all the rights and
obligations of Acquisition. Acquiror, as the sole stockholder of Acquisition,
hereby approves the Merger and this Agreement.

     1.2 Effective Time; Closing. As soon as practicable after satisfaction or,
if permissible, waiver of all conditions to the Merger set forth in Article VII,
the parties shall cause the Merger to be consummated by filing a certificate of
merger with the Secretary of State of the State of Delaware (the "Certificate of
Merger"), in such form as required by and executed in accordance with the
relevant provisions of the GCL. The Merger shall become effective at the time
when the Certificate of Merger has been duly

                                       A-1

<PAGE>   61


filed with the Secretary of State of the State of Delaware or at such later time
as is specified in the Certificate of Merger, as agreed by the parties (the
"Effective Time"). Contemporaneous with the filing of the Certificate of Merger,
a closing of the Merger shall be held at 9:00 a.m., Mountain Standard Time, at
the offices of Morrison & Foerster LLP, 370 Seventeenth Street, Suite 5200,
Denver, Colorado 80202 or at such other time or location as the parties may
establish.

     1.3 Effects of the Merger. The Merger shall have the effects set forth in
the GCL.

     1.4 Subsequent Actions. If, at any time after the Effective Time, the
Surviving Corporation shall consider or be advised that any deeds, bills of
sale, assignments, assurances or any other actions or things are necessary or
desirable to vest, perfect or confirm of record or otherwise in the Surviving
Corporation its right, title or interest in, to or under any of the rights,
properties or assets of either of the Company or Acquisition acquired or to be
acquired by the Surviving Corporation as a result of, or in connection with, the
Merger or otherwise to carry out this Agreement, the officers and directors of
the Surviving Corporation are authorized to execute and deliver, in the name and
on behalf of either the Company or Acquisition, all such deeds, bills of sale,
assignments and assurances and to take and do, in the name and on behalf of each
of such corporations or otherwise, all such other actions and things as may be
necessary or desirable to vest, perfect or confirm any and all right, title and
interest in, to and under such rights, properties or assets in the Surviving
Corporation or otherwise to carry out this Agreement.

     1.5 Certificate of Incorporation and Bylaws.

         (a) The Certificate of Incorporation of Acquisition, as in effect
immediately prior to the Effective Time, shall be the Certificate of
Incorporation of the Surviving Corporation, provided that, at the Effective
Time, the first item of the Certificate of Incorporation of the Surviving
Corporation shall read (until duly amended in accordance with applicable law) as
follows: "FIRST: The name of the Corporation is Harding Environmental Science &
Engineering, Inc."

         (b) The Bylaws of Acquisition, as in effect immediately prior to the
Effective Time, shall be the Bylaws of the Surviving Corporation (until duly
amended in accordance with applicable law).

     1.6 Directors and Officers. The directors of Acquisition immediately prior
to the Effective Time shall be the initial directors of the Surviving
Corporation, and the officers of the Company immediately prior to the Effective
Time shall be the initial officers of the Surviving Corporation, each to hold
office from the Effective Time in accordance with the Certificate of
Incorporation and the Bylaws of the Surviving Corporation.

                                       A-2

<PAGE>   62


     1.7 Conversion of Shares. At the Effective Time, by virtue of the Merger
and without any action on the part of Acquiror, Acquisition, the Company or any
holder of Shares:

         (a) each Share issued and outstanding immediately prior to the
Effective Time (other than any Shares held by Acquiror, Acquisition or any
direct or indirect wholly owned subsidiary of Acquiror, in the Company's
treasury (other than Shares held in the rabbi trust of the Company) or by any
subsidiary of the Company (collectively, "Excluded Shares"), and other than
Dissenting Shares, as defined in Section 2.1) shall automatically be converted
into the right, subject to the provisions of Section 2.2(c), to receive a price
of $11.50 per share in cash, without interest thereon, subject to reduction for
applicable withholding taxes or stock transfer taxes payable by the seller (the
"Merger Consideration"), deliverable to the holder thereof upon surrender of the
certificate formerly representing such Share in the manner provided by Section
2.2; and

         (b) each Excluded Share immediately prior to the Effective Time shall
be cancelled and shall cease to exist and no payment or other consideration
shall be made with respect thereto.

     1.8 Conversion of Acquisition's Capital Stock. At the Effective Time, by
virtue of the Merger and without any action on the part of Acquiror,
Acquisition, the Company or any holder of any shares of the outstanding capital
stock of Acquisition, each share of common stock, par value $.01 per share, of
Acquisition issued and outstanding immediately prior to the Effective Time shall
be converted into and exchanged for one validly issued, fully paid and
nonassessable share of Class B Common Stock, par value $.01 per share, of the
Surviving Corporation.

     1.9 Employee Options, Employee Stock Purchase Plan and Rabbi Trust.

         (a) On or before the Effective Time, the Company shall accelerate the
unvested portion of all outstanding Company Options (as defined in Section
3.2(a)), conditioned upon the successful completion of the Merger. In lieu of
exercising such Company Options each holder thereof shall, upon surrender for
cancellation of the same to the Company on or before the Effective Time, be
entitled to receive from the Company, subject to applicable withholding
requirements, an amount in cash equal to the excess, if any, of (i) the product
of the number of Shares covered by such Company Options multiplied by the Merger
Consideration, over (ii) the product of the number of Shares covered by such
Company Options multiplied by the per-Share exercise or purchase price payable
upon exercise or purchase of the same. The Company on or before the Effective
Time shall use its reasonable best efforts to (x) obtain any requisite consents
from holders of Company Options to acquire Shares and (y) make any changes in
the Stock Option Plans (as defined in Section 3.2(a)) and Employee Stock
Purchase Plan and Company Options that are necessary to give effect to the
transactions contemplated by this Section 1.9(a).

                                       A-3

<PAGE>   63


         (b) The Company shall take such actions, on or before the Effective
Time, as are necessary to terminate the Company's Employee Stock Purchase Plan.

         (c) The Company shall take such actions, on or before the Effective
Time, as are necessary to extinguish all liabilities of the Company's
Non-Qualified Deferred Compensation Plan adopted in November, 1987, and
terminate the Company's rabbi trust relating thereto.

                                   ARTICLE II

                      DISSENTING SHARES; EXCHANGE OF SHARES

     2.1 Dissenting Shares. Notwithstanding anything in this Agreement to the
contrary, each Share which is issued and outstanding immediately prior to the
Effective Time and which is held by a stockholder who has not voted such Shares
in favor of the Merger or consented thereto in writing and who is entitled by
applicable Delaware law to appraisal rights, and who shall have properly
demanded in writing appraisal for such Shares in accordance with Section 262 of
the GCL (collectively, the "Dissenting Shares"), shall not be converted into or
represent the right to receive the Merger Consideration, unless and until such
holders shall have failed to perfect or shall have effectively withdrawn or lost
their rights to appraisal and payment under the GCL. If any such holder shall
have so failed to perfect or shall have effectively withdrawn or lost such
right, his Shares shall thereupon be deemed to have been converted into and to
have become exchangeable for, at the Effective Time, the right to receive the
Merger Consideration, without any interest thereon, upon surrender of the
certificate formerly representing such Shares in the manner provided in Section
2.2. The Company shall give Acquiror prompt notice of any written demands for
appraisal or notices of dissent with respect to any Shares, any withdrawal of
any such demand, and any other instruments served pursuant to the GCL and
received by the Company, and Acquiror shall have the right to participate in and
to control all negotiations and proceedings with respect to any demands for
appraisal made by any holders of Dissenting Shares. Prior to the Effective Time,
the Company shall not, except with the prior written consent of Acquiror, make
any payment with respect to, or settle or offer to settle, any such demands.

     2.2 Exchange of Shares.

         (a) Prior to the Effective Time, Acquisition shall designate a bank or
trust company (which shall be insured by the Federal Deposit Insurance
Corporation (the "FDIC") and be reasonably acceptable to the Company) to act as
agent for the holders of Shares in connection with the Merger (the "Paying
Agent") to receive the funds constituting the Merger Consideration to which
holders of Shares become entitled at the Effective Time pursuant to Section
1.7(a), all such funds to be deposited in trust with the Paying Agent
immediately prior to the Effective Time on terms reasonably acceptable to the
Company. The aggregate Merger Consideration shall be invested by the Paying
Agent, as directed by Acquiror (so long as such directions do not impair the
rights of

                                       A-4

<PAGE>   64


holders of Shares). Any net profits resulting from, or interest or income
produced by, such investments shall be payable as directed by Acquiror.

         (b) Promptly after the Effective Time, the Surviving Corporation shall
cause to be mailed to each person who was, immediately prior to the Effective
Time, a holder of record of Shares (other than holders of Excluded Shares), a
form of letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to a certificate which, immediately prior
to the Effective Time, represented any Shares (a "Certificate") shall pass, only
upon proper delivery of the Certificate to the Paying Agent and shall be in a
form and have such other provisions as Acquiror may reasonably specify) and
instructions for use in effecting the surrender of the Certificate for payment
of the appropriate Merger Consideration. Upon surrender to the Paying Agent of a
Certificate, together with such letter of transmittal, duly executed and
completed in accordance with the instructions thereto, and any other documents
as may be required pursuant to such instructions, the holder of such Certificate
shall be entitled to receive in exchange therefor the Merger Consideration for
each Share formerly represented by such Certificate (subject to required tax
withholdings), and such Certificate shall then be cancelled. No interest will be
accrued or paid on the Merger Consideration. If delivery of the Merger
Consideration is to be made to a person other than the person in whose name a
surrendered Certificate is registered, it shall be a condition to such delivery
that the Certificate so surrendered shall be properly endorsed or otherwise in
proper form for transfer and that the person requesting such delivery shall have
paid all transfer and other taxes required by reason of such delivery to a
person other than such registered holder or shall have established to the
satisfaction of the Surviving Corporation that such tax either has been paid or
is not applicable. If a mutilated Certificate is surrendered to the Paying Agent
or if the holder of a Certificate submits an affidavit to the Paying Agent
stating that the Certificate has been lost, destroyed or wrongfully taken, such
holder shall, if required by the Surviving Corporation, furnish an indemnity
bond sufficient in the reasonable judgment of the Surviving Corporation to
protect Acquiror, the Surviving Corporation and the Paying Agent from any loss
that any of them may suffer. Until surrendered in accordance with the provisions
of this Section 2.2, from and after the Effective Time each Certificate (other
than Certificates representing Excluded Shares and other than Certificates
representing Dissenting Shares) shall represent for all purposes only the right
to receive for each Share represented thereby the Merger Consideration. All
Merger Consideration paid upon surrender for exchange of any Certificate in
accordance with the terms of this Agreement shall be deemed to have been paid in
full satisfaction of all rights pertaining to such Certificate.

         (c) At any time following 180 days after the Effective Time, the
Surviving Corporation shall be entitled to require the Paying Agent to deliver
to it any funds (including any interest received with respect thereto) which had
been made available to the Paying Agent and which have not been disbursed to
holders of Certificates, and thereafter such holders shall be entitled to look
only to the Surviving Corporation (subject to abandoned property, escheat and
other similar laws) for distribution of the Merger Consideration, upon due
surrender of their Certificates. Notwithstanding the foregoing,

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none of Acquiror, Acquisition, Surviving Corporation or the Paying Agent shall
be liable to a holder of a Certificate for Merger Consideration properly
delivered to a public official pursuant to any applicable abandoned property,
escheat or similar law.

         (d) From and after the Effective Time, the holders of Certificates
evidencing ownership of Shares outstanding immediately prior to the Effective
Time shall cease to have any rights with respect to such Shares, except as
otherwise provided for herein or by applicable law.

         (e) At the Effective Time, the stock transfer books of the Company
shall be closed and thereafter there shall be no registration of transfers of
Shares on the records of the Company. If, after the Effective Time, Certificates
are presented to the Surviving Corporation, they shall be cancelled and
exchanged for the Merger Consideration as provided in this Section 2.2.

         (f) Acquiror or the Paying Agent shall be entitled to deduct and
withhold from the consideration otherwise payable pursuant to this Agreement to
any holder of Shares such amounts as Acquiror or the Paying Agent is required to
deduct and withhold with respect to the making of such payment under the
Internal Revenue Code of 1986, as amended (the "Code") or under any provision of
state, local or foreign tax law. To the extent that amounts are so withheld by
Acquiror or the Paying Agent, such withheld amounts shall be treated for all
purposes of this Agreement as having been paid to the holder of the Shares in
respect of which such deduction and withholding was made by the Acquiror or the
Paying Agent.

                                   ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to Acquiror and Acquisition as follows:

     3.1 Organization and Qualification; Subsidiaries. Each of the Company and
its subsidiaries (the "Subsidiaries") is a corporation duly organized, validly
existing and in good standing under the laws of the jurisdiction of its
incorporation and each has all requisite corporate or other power and authority
to own, lease or operate the properties that it purports to own, lease or
operate and to conduct its business as it is now being conducted, except where
the failure to be so existing and in good standing or to have such power and
authority has not had and would not, individually or in the aggregate, have a
Material Adverse Effect (as defined below). Each of the Company and the
Subsidiaries is duly qualified or licensed as a foreign corporation to do
business and is in good standing in each jurisdiction where the property owned,
leased or operated by it or the nature of its activities makes such
qualification or licensing necessary, except for such failures to be so duly
qualified or licensed and in good standing which has not had and would not,
either individually or in the aggregate, have a Material Adverse Effect. When
used in connection with the Company or a Subsidiary, the term "Material Adverse
Effect" means any change in or effect on the business, assets, liabilities,
results of operations or

                                       A-6

<PAGE>   66


condition (financial or otherwise) of the Company or any of the Subsidiaries
that has been or could reasonably be expected to be materially adverse to the
Company and the Subsidiaries taken as a whole or prevent, materially delay or
materially impair the ability of the Company to consummate the transactions
contemplated by this Agreement. The Company has heretofore delivered to Acquiror
true and complete copies of the charters and Bylaws of the Company and the
Subsidiaries as currently in effect. The Company is not in violation of any of
the provisions of its Certificate of Incorporation or Bylaws. Schedule 3.1(a)
contains a correct and complete list of (A) the legal name of each of the
Company's Subsidiaries, (B) the jurisdiction where each of such Subsidiaries is
incorporated or organized, (C) the jurisdictions in which each of the Company
and its Subsidiaries is qualified to transact business as a foreign corporation
and (D) the percentage of outstanding capital stock of such Subsidiaries that is
directly or indirectly owned by the Company. Schedule 3.1(b) sets forth a true
and complete list of the direct and indirect partnership, joint venture, or
other equity investments made by the Company or any of its Subsidiaries in any
person other than the Company's Subsidiaries, and the nature and amount of such
investments.

     3.2 Capitalization.

         (a) The authorized capital stock of the Company consists of 1,000,000
shares of preferred stock, par value $0.01 per share, none of which are issued
and outstanding, and 10,000,000 shares of Common Stock. As of the date hereof,
there were 5,100,996 shares of Common Stock issued and outstanding, all of which
are validly issued, fully paid and nonassessable, are entitled to vote on this
Agreement and are not subject to and were not issued in violation of any
preemptive rights. Schedule 3.2(a) contains a correct and complete list as of
the date hereof of each outstanding purchase right or option (each a "Company
Option") to purchase Shares, including all Company Options issued under the 1998
Stock Option Plan, the 1988 Stock Option and Restricted Stock Option Plan, the
1987 Stock Option Plan, and the Employment Agreement between the Company and
Robert L. Costello, Jr. in each case as amended to the date hereof
(collectively, the "Stock Option Plans"), including the holder, date of grant,
exercise price and number of Shares subject thereto. Since the date hereof, the
Company has not issued any shares of capital stock except pursuant to the
exercise of Company Options outstanding as of such date. The Stock Option Plans
and the Employee Stock Purchase Plan are the only plans under which Company
Options are outstanding. Other than Company Options outstanding as of the date
hereof and the Shares reserved for issuance upon exercise of those Company
Options, there are not now, and at the Effective Time there will not be, any
options, warrants, calls, rights, registration rights, subscriptions,
convertible securities or other rights or other agreements, arrangements or
commitments of any kind obligating the Company or any of its Subsidiaries to
issue, transfer, sell or register any securities of the Company. All shares of
Common Stock subject to issuance as described above, upon issuance on the terms
and conditions specified in the instruments pursuant to which they are issuable,
will be duly authorized, validly issued, fully paid and nonassessable. There are
no outstanding contractual or other obligations of the Company or any of the
Subsidiaries to purchase, redeem or otherwise acquire any

                                       A-7

<PAGE>   67


Shares or the capital stock of any Subsidiary. There are no bonds, debentures,
notes or other indebtedness having general voting rights (or convertible into
securities having such rights) ("Voting Debt") of the Company or any of its
Subsidiaries issued and outstanding. There are not now, and at the Effective
Time there will not be, any stockholder agreement, voting trust, proxies or
other agreements or understandings to which the Company or any Subsidiary is a
party or is bound relating to any shares of the capital stock of the Company or
any Subsidiary or granting to any person or group of persons the right to elect,
or to designate or nominate for election, a director to the Board of Directors
of the Company.

         (b) All the outstanding shares of each of the Subsidiaries have been
validly issued and are fully paid and nonassessable, are not subject to and were
not issued in violation of any preemptive rights, and are owned by the Company
or a Subsidiary free and clear of all liabilities, obligations, claims, liens,
pledges, security interests, options, charges, encumbrances and interests of any
third party of any nature whatsoever. There are not now, and at the Effective
Time there will not be, any options, warrants, calls, rights, subscriptions,
convertible securities or other rights or other agreements, arrangements or
commitments of any kind relating to the issued or unissued capital stock or
other securities of any Subsidiary or otherwise obligating the Company or any
Subsidiary to issue, transfer or sell any securities of any Subsidiary.

     3.3 Authority Relative to this Agreement. The Company has full corporate
power and authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby. The execution and delivery of this Agreement
by the Company and the consummation by the Company of the transactions
contemplated hereby have been duly and validly authorized by all necessary
corporate action on the part of the Company (other than, with respect to the
Merger, the approval and adoption of this Agreement by the holders of a majority
of the outstanding Shares, if and to the extent required by applicable law).
This Agreement has been duly executed and delivered by the Company and, assuming
the due authorization, execution and delivery of this Agreement by Acquiror and
Acquisition, constitutes a legal, valid and binding agreement of the Company,
enforceable against the Company in accordance with its terms, subject to (i) any
applicable bankruptcy, insolvency or other similar laws now or hereafter in
effect affecting creditors' rights generally, and (ii) general principles of
equity (regardless of whether enforcement is considered in a proceeding in
equity or at law).

     3.4 Consents and Approvals; No Violation. None of the execution and
delivery of this Agreement by the Company, the consummation by the Company of
the transactions contemplated hereby or compliance by the Company with any of
the provisions hereof will (i) conflict with or result in a breach of any
provision of the respective charters or Bylaws (or similar governing documents)
of the Company or any Subsidiary, (ii) require any consent, approval,
authorization or permit of, or filing with or notification to, any court or
other governmental, administrative or regulatory authority, agency, commission,
body or other governmental entity ("Governmental Entity"), by the Company or any
Subsidiary except (A) pursuant to the Exchange Act, the Securities Act of 1933,
as amended (the "Securities Act"), certain state "blue sky" statutes, and the
Hart-

                                      A-8

<PAGE>   68


Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR Act"), (B)
for filing the Certificate of Merger pursuant to the GCL, and (C) novations
required under government contracts set forth on Schedule 3.4, (iii) except as
set forth on Schedule 3.4, result in a default (or an event which with notice or
lapse of time or both would become a default) or give to any third party any
right of termination, cancellation, amendment or acceleration under, result in
any loss of any material benefit or result in the creation of a lien or
encumbrance on any of the assets of the Company or any Subsidiary pursuant to,
any note, bond, mortgage, indenture, lease, permit, franchise, license,
agreement or other instrument or obligation to which the Company or any
Subsidiary is a party or by which the Company or any Subsidiary or any of their
respective assets may be bound or affected, or (iv) violate or conflict with any
order, writ, injunction, decree, statute, rule, regulation, permit or license
applicable to the Company or any Subsidiary or any of their respective
properties or assets; other than (A) such defaults, rights of termination,
cancellation, amendment or acceleration, liens and encumbrances, violations and
conflicts set forth pursuant to (iii) and (iv) above, and (B) such consents,
approvals, authorizations, permits or filings, as set forth pursuant to (ii)
above, the failure to obtain which, individually or in the aggregate, have not
had and would not have a Material Adverse Effect.

     3.5 SEC Filings; Financial Statements.

         (a) The Company has heretofore delivered or made available to Acquiror
or Acquisition true and complete copies of all forms, reports, registration
statements and documents filed with the SEC by it since May 31, 1994
(collectively, the "SEC Reports"), all of which, as of their respective dates,
complied in all material respects with all applicable requirements of the
Securities Act, the Exchange Act and the rules and regulations promulgated
thereunder. None of the SEC Reports (including, without limitation, any
financial statements or schedules included therein) contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary in order to make the statements made therein, in
light of the circumstances under which they were made, not misleading. Since May
31, 1994, the Company has made all filings required by the Securities Act, the
Exchange Act and the rules and regulations promulgated thereunder. None of the
Subsidiaries is required to file any statements or reports with the SEC pursuant
to Section 13(a) of 15(d) of the Exchange Act.

         (b) Other than liabilities reflected in the unaudited consolidated
balance sheet of the Company as of November 30, 1999, including the notes
thereto (the "Balance Sheet"), the Company and its Subsidiaries do not have any
liabilities, either accrued or contingent (whether or not required to be
reflected in financial statements in accordance with generally accepted
accounting principles applied on a consistent basis ("GAAP"), including
liabilities arising under any Environmental Law, and whether due or to become
due, other than normal or recurring liabilities incurred since November 30, 1999
in the ordinary course of business consistent with past practice, which,
individually or in the aggregate, have not had and would not have a Material
Adverse Effect.

                                      A-9

<PAGE>   69


         (c) The audited and unaudited consolidated financial statements
included in the SEC Reports, any SEC Reports to be filed after the date of this
Agreement until the Effective Time, and the Balance Sheet (including any related
notes and schedules) were, or will be, prepared in conformity with GAAP during
the periods involved, except as otherwise noted therein, and with respect to the
published rules and regulations of the SEC applicable thereto, and each presents
fairly, or will represent fairly, the consolidated financial position of the
Company and its consolidated Subsidiaries as of their respective dates and the
consolidated results of their operations and changes in financial position for
the periods presented therein, as the case may be, subject, in the case of
unaudited interim financial statements included therein, to normal year-end
adjustments that in the aggregate are not material in amount and the absence of
notes.

         (d) The Company has furnished to Acquiror a complete and correct copy
of any amendments or modifications which have not yet been filed with the SEC to
agreements, documents or other instruments which previously had been filed by
the Company with the SEC pursuant to the Securities Act and the rules and
regulations promulgated thereunder or the Exchange Act and the rules and
regulations promulgated thereunder.

         (e) Schedule 3.5(e) lists all "Accommodation Obligations" (as defined
below) of the Company, the person in whose favor the Company has entered into
each such obligation, and the general nature of each obligation guaranteed, and
the amount of each Accommodation Obligation. "Accommodation Obligations" means
any contractual obligation, contingent or otherwise, of one person with respect
to any indebtedness, obligation or liability of another, if the primary purpose
or intent thereof by the person incurring the Accommodation Obligation is to
provide assurance to the obligee of such indebtedness, obligation or liability
of another that such indebtedness, obligation or liability shall be paid or
discharged, or that any agreements relating thereto shall be complied with, or
that the holders thereof shall be protected (in whole or in part) against loss
in respect thereof, including, without limitation, direct and indirect
guarantees, endorsements (except for collection or deposit in the ordinary
course of business), notes co-made or discounted, recourse agreements,
take-or-pay agreements, keep-well agreements, agreements to purchase security
thereof (other than such agreements to purchase in the ordinary course of
business) or to provide funds for the payment or discharge thereof agreements to
maintain solvency, assets, level of income, or other financial condition, and
agreements to make payment other than for value received. The amount of an
Accommodation Obligation shall be equal to the lesser of (i) the amount payable
under such Accommodation Obligation (if quantifiable) and (ii) the portion of
the obligation so guaranteed or otherwise supported.

         (f) Schedule 3.5(f) sets forth an accurate list of all international
letters of credit and bonds and all other letters of credit and bonds issued for
the benefit of the Company in an amount greater than $100,000.

     3.6 Absence of Certain Changes and Events. Since November 30, 1999, except
as disclosed on Schedule 3.6, (a) there has not occurred or arisen any event
having or that

                                      A-10

<PAGE>   70


would have, and neither the Company nor any Subsidiary has suffered, any
Material Adverse Effect and (b) the Company and the Subsidiaries have conducted
their businesses only in the usual and ordinary course, consistent with past
practices.

     3.7 Proxy Statement. The letter to stockholders, notice of meeting, proxy
statement and form of proxy, to be distributed to stockholders of the Company in
connection with the Merger (if required by applicable law), and any schedules
and exhibits required to be filed with the SEC in connection therewith (all such
documents, together with all amendments and supplements thereto, being referred
to herein as the "Proxy Statement"), will comply in all material respects with
the Exchange Act and the rules and regulations thereunder, except that no
representation or warranty is being made by the Company with respect to any
information supplied to the Company by Acquisition or any affiliate of
Acquisition specifically for inclusion in the Proxy Statement. The Proxy
Statement will not, at the time the Proxy Statement (or any amendment or
supplement thereto) is filed in final form with the SEC or first sent to
stockholders, at the time of the Special Meeting (and the date of any
adjournment thereof), or at the Effective Time, contain any untrue statement of
a material fact or omit to state a material fact required to be stated therein
or necessary in order to make the statements made therein, in light of the
circumstances under which they were made, not misleading, except that no
representation or warranty is being made by the Company with respect to any
information supplied to the Company by Acquisition or any affiliate of
Acquisition specifically for inclusion in the Proxy Statement.

     3.8 Material Assets. The Company has good and marketable title to all
material assets reflected on the Balance Sheet except for (a) liens for current
taxes and assessments not yet past due, (b) inchoate mechanics' and
materialmen's liens for construction in progress, (c) workmen's, repairmen's,
warehousemen's and carriers' liens arising in the ordinary course of business,
and (d) all matters of record, liens and other imperfections of title and
encumbrances which matters, liens and imperfections, individually or in the
aggregate, have not had and would not have a Material Adverse Effect.

     3.9 Material Proceedings. Except as disclosed in the SEC Reports or as
disclosed on Schedule 3.9, there are no civil, criminal or administrative
actions, suits or proceedings, claims, arbitrations or investigations pending
or, to the knowledge of the Company, threatened against or involving the
Company, any Subsidiary or the property or assets of the Company or any
Subsidiary, and neither the Company nor any Subsidiary is subject to any
outstanding order, writ, decree or injunction, which, in either case, has had or
would have a Material Adverse Effect.

     3.10 Employee Benefit Plans, Etc.

          (a) Schedule 3.10 lists (i) all "employee benefit plans" within the
meaning of Section 3(3) of ERISA, (ii) all employment agreements, including, but
not limited to, any individual benefit arrangement, policy or practice with
respect to any current or former employee or director of the Company or Member
of the Controlled Group, and

                                      A-11

<PAGE>   71


(iii) all other employee benefit, bonus or other incentive compensation, stock
option, stock purchase, stock appreciation, severance pay, lay-off or reduction
in force, change in control, sick pay, vacation pay, salary continuation,
retainer, leave of absence, educational assistance, service award, employee
discount, fringe benefit plans, arrangements, policies or practices, whether
legally binding or not, which the Company or any Member of the Controlled Group
maintains, to which any of them contributes, or for which any of them has any
obligation or liability (collectively, the "Company Plans" and each a "Company
Plan").

          (b) None of the Company Plans is a Defined Benefit Plan, and neither
the Company nor any Member of the Controlled Group has ever sponsored,
maintained or contributed to, or ever been obligated to contribute to, a Defined
Benefit Plan.

          (c) None of the Company Plans is a Multiemployer Plan, and neither the
Company nor any Member of the Controlled Group has ever contributed to, or ever
been obligated to contribute to, a Multiemployer Plan.

          (d) The Company does not maintain or contribute to any plan that
provides health benefits to an employee after the employee's termination of
employment or retirement except as required under Section 4980B of the Code and
Sections 601 through 608 of ERISA.

          (e) Each Company Plan which is an "employee benefit plan," as defined
in Section 3(3) of ERISA, complies by its terms and in operation with the
requirements provided by any and all statutes, orders or governmental rules and
regulations currently in effect and applicable to the Company Plan, including
but not limited to ERISA and the Code.

          (f) All reports, forms and other documents required to be filed with
any government entity or furnished to employees, former employees or
beneficiaries with respect to any Company Plan (including without limitation,
summary plan descriptions, Forms 5500 and summary annual reports) have been
timely filed and furnished and are accurate.

          (g) Each of the Company Plans that is intended to qualify under
Section 401(a) of the Code has been determined by the Internal Revenue Service
so to qualify after January 1, 1989, and each trust maintained pursuant thereto
has been determined by the Internal Revenue Service to be exempt from taxation
under Section 501 of the Code. Nothing has occurred since the date of the
Internal Revenue Service's favorable determination letter that could adversely
affect the qualification of the Company Plan and its related trust. The Company
and each Member of the Controlled Group have timely amended and operated each of
the Company Plans to comply with the Small Business and Job Protection Act of
1996 and subsequent legislation enacted through the date hereof, and Section 501
of the Code.

                                      A-12

<PAGE>   72


          (h) All contributions for all periods ending prior to the Effective
Time (including periods from the first day of the current plan year to the
Effective Time) have been made prior to the Effective Time by the Company.

          (i) All insurance premiums have been paid in full, subject only to
normal retrospective adjustments in the ordinary course, with regard to the
Company Plans for plan years ending on or before the Effective Time.

          (j) With respect to each Company Plan:

              (1) no prohibited transactions (as defined in Section 406 or 407
of ERISA or Section 4975 of the Code) have occurred for which a statutory
exemption is not available;

              (2) no action or claims (other than routine claims for benefits
made in the ordinary course of Company Plan administration for which Company
Plan administrative review procedures have not been exhausted) are pending,
threatened or imminent against or with respect to the Company Plan, any employer
who is participating (or who has participated) in any Company Plan or any
fiduciary (as defined in Section 3(21) of ERISA), of the Company Plan;

              (3) neither the Company, nor any fiduciary has any knowledge of
any facts that could give rise to any such action or claim; and

              (4) it provides that it may be amended or terminated at any time
and, except for benefits protected under Section 411(d) of the Code, all
benefits payable to current, terminated employees or any beneficiary may be
amended or terminated by the Company at any time without liability.

          (k) Neither the Company nor any Member of the Controlled Group has any
liability or is threatened with any liability (whether joint or several) (i) for
any excise tax imposed by Sections 4971, 4975, 4976, 4977 or 4979 of the Code,
or (ii) to a fine under Section 502 of ERISA.

          (l) All of the Company Plans, to the extent applicable, are in
compliance with the continuation of group health coverage provisions contained
in Section 4980B of the Code and Sections 601 through 608 of ERISA.

          (m) True, correct and complete copies of all documents creating or
evidencing any Company Plan have been delivered to Purchaser, and true, correct
and complete copies of all reports, forms and other documents required to be
filed with any governmental entity or furnished to employees, former employees
or beneficiaries (including, without limitation, summary plan descriptions,
Forms 5500 and summary annual reports for all plans subject to ERISA, but
excluding individual account statements and tax forms) have been delivered to
Purchaser. There are no negotiations, demands or proposals which are pending or
have been made which concern matters now

                                      A-13

<PAGE>   73


covered, or that would be covered, by the type of agreements required to be
listed in Schedule 3.10.

          (n) All expenses and liabilities relating to all of the Company Plans
have been, and will on the Effective Time be fully and properly accrued on the
Company's books and records and disclosed in accordance with generally accepted
accounting principles and in Company Plan financial statements.

          (o) For purposes of this Section 3.10, the following terms have the
following meanings: "Defined Benefit Plan" means either a plan described in
Section 3(35) of ERISA or a plan subject to the minimum funding standards set
forth in Section 302 of ERISA and Section 412 of the Code. "ERISA" means the
Employee Retirement Income Security Act of 1974, as amended. "Member of the
Controlled Group" means each trade or business, whether or not incorporated,
which would be treated as a single employer with the Company under Section 4001
of ERISA or Section 414(b), (c), (m) or (o) of the Code. "Multiemployer Plan"
means a plan described in Section 3(37) of ERISA.

     3.11 Environmental Matters.

          (a) The term "Environmental Laws" means any federal, state, local or
foreign statute, law (including common law), treaty, ordinance, rule,
regulation, policy, permit, consent, approval, license, judgment, order, decree
or injunction relating to: (i) Releases (as defined in 42 U.S.C. Section
9601(22)) or threatened Releases of Hazardous Material (as hereinafter defined)
into the environment, (ii) the generation, treatment, storage, recycling,
presence, disposal, use, handling, manufacturing, transportation or shipment of
Hazardous Material, (iii) natural resources, or (iv) human health or the
environment, and includes all environmental laws or terms of similar import as
they are defined in any indemnification provision in any contract, lease, or
agreement to which Company is a party. The term "Hazardous Material" means (A)
hazardous substances (as defined in 42 U.S.C. Section 9601(14)), (B) petroleum,
including crude oil and any fractions thereof, (C) natural gas, synthetic gas
and any mixtures thereof, (D) asbestos and/or asbestos containing materials, (E)
polychlorinated byphenyls ("PCBs") or materials containing PCBs, (F) radioactive
materials, and (G) pollutants, contaminants or hazardous, toxic or dangerous
substances, materials or wastes or terms of similar import that are identified,
defined, listed or regulated under any Environmental Law or defined in any
indemnification provision in any contract, lease, or agreement to which the
Company is a party.

          (b) Except as set forth on Schedule 3.11, during the period of
ownership or operation by the Company or its Subsidiaries of any of their
current or previously owned or leased properties, there have been no Releases of
Hazardous Material by the Company or any of its Subsidiaries in, on, under or
affecting such properties or any surrounding site, and there have been no
buildings or other structures containing asbestos in a form that is or could
become friable and no underground storage tanks on such properties, except in
each case for those which individually or in the aggregate have not had and

                                      A-14

<PAGE>   74


would not have a Material Adverse Effect. Except as set forth on Schedule 3.11,
there have been no Releases of Hazardous Material by the Company or any of its
Subsidiaries in, on, under or affecting such properties or any surrounding site
at times outside of such periods of ownership, operation, or lease, or to the
knowledge of the Company, by any other party at any time except in each case for
those which individually on in the aggregate have not had and would not have a
Material Adverse Effect. At no time has either the Company or any of its
Subsidiaries generated, treated, stored, recycled, used, handled, transported or
disposed of any Hazardous Material in a manner that has led, or could reasonably
be anticipated to lead, to a Release at any location, except in each case for
those which individually or in the aggregate would not have a Material Adverse
Effect. To the knowledge of the executive officers of the Company, no third
party property is contaminated with any Hazardous Material that may subject the
Company or any of its Subsidiaries to liability under any Environmental Laws.
The Company has provided or made available to the Acquiror complete and correct
copies of all studies, reports, surveys, correspondence or other documents in
the Company's or any Subsidiary's possession, or to which the Company or any
Subsidiary has access, which relate to the presence or alleged presence of
Hazardous Material at, on or affecting any current or previously owned nor
leased property of the Company or any of its Subsidiaries.

          (c) Neither the Company and its Subsidiaries has received any written
notice, demand, request for information, citation, summons, order, nor has it
entered into any order, settlement or decree relating to: (A) any violation of
any Environmental Laws or the institution or pendency of any suit, action,
claim, proceeding or investigation by any Governmental Entity or any third party
in connection with any alleged violation of Environmental Laws, or (B) the
response to or remediation of Hazardous Material at or arising from any of the
Company's or any Subsidiary's operations or current or previously owned or
leased properties.

          (d) The Company and its Subsidiaries hold, and there are in full force
and effect, all material permits, licenses, authorizations and approvals
required under applicable Environmental Laws ("Environmental Permits") to
conduct the business of the Company and its Subsidiaries and to own, maintain
and operate all properties currently owned or operated by the Company or any of
its Subsidiaries, and all such Environmental Permits are in full force and
effect, except where instances of noncompliance, individually or in the
aggregate, have not had and would not have a Material Adverse Effect. Neither
the Company nor any Subsidiary is in default (without regard to requirements of
notice, lapse of time of elections or other persons) under any provision of the
Environmental Permits, and neither the Company nor any Subsidiary has received
any notice of any threatened cancellation, modification or non-renewal of any
Environmental Permit and no consent, approval, authorization, permit of, or
filing with or notification to any governmental or regulatory authority, agency
or entity is required with respect to the Environmental Permits for the change
in control of the Company resulting from the Merger, except where instances of
noncompliance or failure to transfer would not individually or in the aggregate,
have a Material Adverse Effect. The Company has

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<PAGE>   75


delivered or made available to Acquiror a true and complete copy of each of the
Environmental Permits.

          (e) Except as set forth on Schedule 3.11, to the knowledge of the
executive officers of the Company, there are and have been no circumstances or
conditions involving the Company, any of its Subsidiaries or their respective
employees that could reasonably be expected to result in any material claims,
liability or investigations under any Environmental Law or relating to Hazardous
Material arising out of the conduct of the Company's or any Subsidiary's
business, the ownership, operation, management of all or any portion of a
facility, or out of the arrangement for the storage, treatment, recycling,
transportation or disposal of, or ownership or possession or choice of the
treatment, storage or disposal facility for, any material with respect and to
the extent to which the Company or its Subsidiaries provided services before the
Effective Time.

          (f) With respect to each contract or project pursuant to which the
Company or any of its Subsidiaries is responsible for the provision of
environmental remediation services ("Remediation Contract") that involves the
storage, generation, treatment, recycling, handling, transportation, or disposal
of any Hazardous Material or any arrangement for such services (collectively,
"Use of Hazardous Material"), either (a) such Remediation Contract contains
enforceable and prudent indemnification provisions protecting the Company or the
appropriate Subsidiary against liability with respect to the Use of Hazardous
Material as is consistent with national industry standards, or (b) the Use of
Hazardous Material has been subcontracted to a person or entity other than the
Company or any of its Subsidiaries pursuant to a written agreement that contains
enforceable and prudent indemnification provisions protecting the Company or the
appropriate Subsidiary against liability with respect to the Use of Hazardous
Material as is consistent with national industry standards, or (c) management of
the Company has determined, in the exercise of prudent business practices, that
such indemnification could not be reasonably obtained and that the rewards of
accepting such Remediation Contract outweigh the potential risks associated with
the Use of Hazardous Material.

     3.12 Labor Matters. (i) There are no controversies pending or, to the
knowledge of the Company, threatened, between the Company or any of the
Subsidiaries and any group of their respective employees; (ii) neither the
Company nor any of the Subsidiaries is a party to any collective bargaining
agreement or other labor union contract applicable to persons employed by the
Company or the Subsidiaries nor does the Company know of any activities of or
proceedings of any labor union to organize any such employees; (iii) neither the
Company nor any of the Subsidiaries has breached or otherwise failed to comply
with any provision of any such agreement or contract and there are no grievances
outstanding against any such parties under any such agreement or contract; (iv)
there are no unfair labor practice complaints pending against the Company or any
of the Subsidiaries before the National Labor Relations Board of any current
union representation questions involving employees of the Company or any of the
Subsidiaries; and (v) the Company has no knowledge of any strikes, slowdowns,
work stoppages, lockouts, or threats thereof, by or with respect to any
employees of the Company or any of the Subsidiaries. No consent of any union
which is a party to any collective

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<PAGE>   76


bargaining agreement with the Company is required to consummate the transactions
contemplated by this Agreement.

     3.13 Intellectual Property. The Company or the Subsidiaries own or possess
adequate licenses or other valid rights to use all patents, patent rights,
trademarks, service marks, software, computer programs, technology of any kind,
trade names, copyrights, all applications or licenses or other rights to use the
foregoing, know-how, trade secrets and other proprietary information
(collectively, "Intellectual Property") used or held for use in connection with
the business of the Company or any of the Subsidiaries as currently being, or
proposed to be, conducted, all as set forth on Schedule 3.13, and is unaware of
any assertions or claims challenging the validity of any of the Intellectual
Property; and to the best knowledge of the Company, the conduct of the business
of the Company and its Subsidiaries as now conducted or proposed to be conducted
does not and will not conflict with any Intellectual Property of others in any
material way. No material infringement, unauthorized use, misappropriation or
other misuse of any Intellectual Property owned by or licensed by or to the
Company or any of the Subsidiaries is known to the Company.

     3.14 Brokers. None of the Company or any Subsidiary or any of their
respective officers, directors or employees has employed any broker, finder or
investment banker or incurred any liability that would be payable by the Company
for any brokerage, finder's or other fees or commissions in connection with the
transactions contemplated by this Agreement, other than in connection with the
engagement of CIBC World Markets Corp., pursuant to an engagement letter (as
amended) a copy of which the Company has delivered to Acquiror prior to the date
hereof.

     3.15 Taxes. The Company and the Subsidiaries have filed all federal and
state tax returns and reports and, to the best of the Company's knowledge, all
state, local and foreign tax returns and reports required to be filed by them
and have paid and discharged all taxes shown as due thereon and have paid all
applicable state and local ad valorem taxes as are due, except such as are being
contested in good faith by appropriate proceedings and except where the failure
to do so has not had and would not have a Material Adverse Effect. Neither the
Internal Revenue Service nor any other taxing authority or agency is now
asserting or, to the best of the Company's knowledge, threatening to assert
against the Company or any of the Subsidiaries any deficiency or claim for
additional taxes or interest thereon or penalties in connection therewith.
Neither the Company nor any of its subsidiaries has granted any waiver of any
statute of limitations with respect to, or any extension of a period for the
assessment of, any federal, state, county, municipal or foreign income tax. The
accruals and reserves for taxes reflected in the Balance Sheet as of the date
thereof are adequate to cover all taxes accruable through such date (including
interest and penalties, if any, thereon). Neither the Company nor any of the
Subsidiaries has made an election under Section 341(f) of the Code. Except as
set forth on Schedule 3.15, neither the Company nor any of the Subsidiaries has
entered into any compensatory arrangements with respect to the performance of
services payment of which would result in a nondeductible expense to the Company
or the Subsidiary under Section 162(m) or Section 280G of the Code, or an

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<PAGE>   77


excise tax to the recipient of such payment pursuant to Section 4999 of the
Code. The stock of the Company is not a "United States real property interest"
within the meaning of Section 897(c)(1) of the Code.

     3.16 Real Properties.

          (a) Each of the Company and its Subsidiaries has good and marketable
title to all of the real property owned by it, and all real property leases of
the Company or any of its Subsidiaries are in good standing, valid and effective
in accordance with their respective terms, and neither the Company nor its
Subsidiaries, nor, to the Company's knowledge, any other party, is in default
under any of such leases, other than defaults which, individually or in the
aggregate, have not had and would not have a Material Adverse Effect on the
Company.

          (b) Except as disclosed in the Balance Sheet, each parcel of real
property owned or leased by the Company or any Subsidiary (i) is owned or leased
free and clear of all mortgages (other than for the mortgage on the property
located at 6500 All American Blvd., Orlando, Florida), pledges, liens, security
interests, conditional and installment sale agreements, encumbrances, charges or
other claims of third parties of any kind, including, without limitation, any
easement, right of way or other encumbrance to title, or any option, right of
first refusal, or right of first offer (collectively, "Liens"), other than (A)
Liens for current taxes and assessments not yet past due, (B) inchoate
mechanics' and materialmen's Liens for construction in progress, (C) workmen's,
repairmen's, warehousemen's and carriers' Liens arising in the ordinary course
of business of the Company or such Subsidiary consistent with past practice, and
(D) all matters of record, Liens and other imperfections of title and
encumbrances that, individually or in the aggregate, have not had and would not
have a Material Adverse Effect, and (ii) is neither subject to any governmental
decree or order to be sold nor is being condemned, expropriated or otherwise
taken by any public authority with or without payment of compensation therefor,
nor, to the knowledge of the Company, has any such condemnation, expropriation
or taking been proposed, except as have not had and would not have a Material
Adverse Effect.

     3.17 Compliance with Laws. Except as disclosed on Schedule 3.17, the
businesses of each of the Company and its Subsidiaries have not been, and are
not being, conducted in violation of any law, ordinance, regulation, judgment,
order, injunction, decree, arbitration award, license or permit of any
Governmental Entity, including any Environmental Laws (collectively, "Laws"),
except for violations or possible violations that, individually or in the
aggregate, have not had and would not have a Material Adverse Effect. Except as
disclosed in Schedule 3.17, no investigation or review by any Governmental
Entity with respect to the Company or any of its Subsidiaries is pending or, to
the knowledge of the Company, threatened, nor has any Governmental Entity
indicated an intention to conduct the same.

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<PAGE>   78


     3.18 Interested Party Transactions. Since August 11, 1999, no event has
occurred that could be required to be reported by the Company as a Certain
Relationship or Related Transaction, pursuant to Item 404 of Regulation S-K
promulgated by the SEC.

     3.19 Insurance. The Company maintains the insurance policies listed on
Schedule 3.19(a) (the "Insurance Policies"). Each Insurance Policy is in full
force and effect and is valid, outstanding and enforceable, and all premiums due
thereon have been paid in full. None of the Insurance Policies will terminate or
lapse (or be affected in any other materially adverse manner) by reason of the
transactions contemplated by this Agreement. The Company and its Subsidiaries
have complied in all material respects with the provisions of each Insurance
Policy under which it is the insured party. No insurer under any Insurance
Policy has canceled or generally disclaimed liability under any such policy or,
to the Company's knowledge, indicated any intent to do so or not to renew any
such policy. All material claims under the Insurance Policies have been filed in
a timely fashion. Schedule 3.19(b) lists all claims made within the last three
(3) years against or under the Contractors Pollution Liability and Errors and
Omissions/Operations and Professional Services Insurance and other errors and
omissions insurance policies maintained by the Company or any of its
Subsidiaries.

     3.20 Certain Business Practices. Neither the Company, any of its
Subsidiaries nor any directors, officers, agents or employees of the Company or
any of its Subsidiaries has (i) used any funds for unlawful contributions,
gifts, entertainment or other unlawful expenses related to political activity;
(ii) made any unlawful payment to foreign or domestic government officials or
employees or to foreign or domestic political parties or campaigns or violated
any provision of the Foreign Corrupt Practices Act of 1977, as amended; or (iii)
made any other payment prohibited by applicable law.

     3.21 Y2K Compliance. The status of the Company's Year 2000 compliance is as
set forth in the Company's Form 10-Q for its fiscal quarter ended November 30,
1999.

     3.22 Agreement, Contracts and Commitments.

          (a) Except for any contract filed as an exhibit to any SEC Report or
as set forth on Schedule 3.22(a) hereto (collectively, the "Company Material
Contracts"), neither the Company nor any of the Subsidiaries is a party to or is
bound by,

              (i) any "material contract" (as such term is defined in Item
601(b)(10) of Regulation S-K of the SEC);

              (ii) any lease of machinery, equipment or other personal property
that contemplates payments by or to the Company or any of the Subsidiaries
individually exceeding $25,000 or in the aggregate exceeding $200,000 in any
twelve-month period;

              (iii) any contract for the purchase of any equipment, materials or
supplies for a purchase price exceeding $25,000 for any such contract or group
of related contracts or $200,000 in the aggregate for all such contracts;

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<PAGE>   79


              (iv) any Governmental Contract (as defined in Section 3.24(c)) or
any commercial contract for the sale of the Company's services or products which
is likely to involve revenues to the Company of more than $250,000 in the
aggregate, over the remaining term;

              (v) (A) any contract, agreement or instrument relating to or
evidencing purchase money indebtedness in excess of $100,000 or indebtedness for
borrowed money of the Company or any Subsidiary, (B) any Accommodation
Obligation in excess of $100,000 or (C) extension of credit by the Company or
any Subsidiary in excess of $100,000 or loan by the Company or any Subsidiary;

              (vi) any non-competition agreement or any other agreement or
obligation which purports to limit in any respect the manner in which, the
localities in which, or the period during which the business of the Company or
the Subsidiaries may be conducted;

              (vii) any partnership, joint venture, strategic alliance or
cooperation agreement (or any agreement similar to any of the foregoing);

              (viii) any voting or other agreement governing how any Shares
shall be voted;

              (ix) any contract or other agreement which would prohibit or
materially delay the consummation of the Merger or any of the transactions
contemplated by this Agreement;

              (x) any brokerage or finders fee agreements other than agreements
for normal brokerage commissions or finders fees payable in the ordinary course
of business; or

              (xi) any other contract that individually contemplates payments by
or to the Company or any of the Subsidiaries exceeding $50,000 in any
twelve-month period or which in the aggregate contemplate payments by or to the
Company or any of the Subsidiaries exceeding $200,000 in any twelve-month period
or which otherwise are material to the operations of the Company or any of the
Subsidiaries.

          (b) Except as set forth on Schedule 3.22(b) hereto, each Company
Material Contract is valid and binding on the Company (or, to the extent a
Subsidiary is a party, such Subsidiary) and, to the Company's knowledge, each
other party thereto, and each is in full force and effect, and the Company and
each Subsidiary and, to the Company's knowledge, each other party thereto have
performed all obligations required to be performed by them to date under each
Company Material Contract. Neither the Company nor any Subsidiary knows of, or
has given or received notice of, any violation or default under (nor, to the
knowledge of the Company, has there occurred any event or does there exist any
condition which with the passage of time or the giving of notice or both would
result in such a violation or default under) any Company Material Contract.

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<PAGE>   80


          (c) Schedule 3.22(c) lists all open projects having an original
project value greater than $250,000 that:

              (i) are performed on a firm fixed price basis, or

              (ii) are greater than five percent (5%) over budget; such Schedule
lists the amount the project is over budget.

          (d) Schedule 3.22(d) lists all projects which:

              (i) the client or any other contractor or subcontractor on the
project has made a claim that the Company has misperformed or negligently
performed such project, or is in breach of any project-related agreement;

              (ii) there are current project reserves greater than $25,000; or

              (iii) for which project reserves of greater than $25,000 have been
released or reversed within the past 180 days.

     3.23 Merger Payments. Except as specifically identified and estimated on
Schedule 3.23, the execution and delivery of this Agreement, consummation or
announcement of any transaction contemplated by this Agreement or any subsequent
termination of employment will not result in any material payment (whether of
severance pay or otherwise) becoming due from the Company or any of its
Subsidiaries to any officer, employee, former employee or director thereof under
any management, employment, deferred compensation, severance (including any
payment, right or benefit resulting from a change in control), bonus or other
contract for personal services with any officer, director or employee or any
plan, agreement or understanding similar to any of the foregoing or any "rabbi
trust" or similar arrangement or material benefit under any of the Company Plans
being established or becoming accelerated, vested or payable.

     3.24 Government Contracts. Except as disclosed in Schedule 3.24:

          (a) With respect to each Government Contract or Bid to which the
Company and/or any of its Subsidiaries is a party: (i) all representations and
certifications were current, accurate and complete when made, and the Company
and its Subsidiaries have fully complied with all such representations and
certifications; (ii) no allegation has been made, either orally or in writing,
that the Company or any of its Subsidiaries is in breach or violation of any
material statutory, regulatory or contractual requirement; (iii) no termination
for convenience, termination for default, cure notice or show cause notice has
been issued; (iv) no cost in excess of $200,000 incurred by the Company, any of
its Subsidiaries or any of their respective subcontractors has been questioned
or disallowed; (v) no money due to the Company or any of its Subsidiaries has
been (or has threatened to be) withheld or set off; (vi) no request for a
contract price adjustment based on a claimed disallowance by a Governmental
Entity or claim of defective pricing or mischarging of any kind has been made;
and (vii) no claim or request

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<PAGE>   81


for equitable adjustment or other demand by the Company or any Subsidiary
against any Governmental Entity or any third party has been made, and to the
best of the Company's knowledge, no basis therefor exists.

          (b) Neither the Company, any of its Subsidiaries, any of their
respective affiliates, nor any of the Company's or any of its Subsidiaries'
directors, officers, employees, agents or consultants is (or for the last three
years has been) (i) under administrative, civil or criminal investigation,
indictment or information, audit or internal investigation with respect to any
alleged irregularity, misstatement or omission regarding a Government Contract
or Bid; or (ii) temporarily or permanently suspended, debarred or enjoined from
doing business with any Governmental Entity or from engaging in or continuing
any conduct or practice in connection with the activities of the Company or any
of the Subsidiaries or declared nonresponsible or ineligible for government
contracting. None of the Company, any of its Subsidiaries or any of their
respective affiliates has made a voluntary disclosure to any Governmental Entity
with respect to any alleged material irregularity, misstatement or omission
arising under or relating to any Government Contract or Bid. The Company knows
of no circumstances that would warrant the institution of suspension or
debarment proceedings or the finding of nonresponsibility or ineligibility of
the Company or any of its Subsidiaries in the future.

          (c) Definitions. The following terms, as used herein, shall have the
following meanings:

          "Bid" means any quotation, bid or proposal by the Company, any of its
Subsidiaries or any of their respective affiliates which, if accepted or
awarded, would lead to a contract with a Governmental Entity or any other
entity, including a prime contractor or a higher tier subcontractor to a
Governmental Entity, for the design, manufacture or sale of products or the
provision of services by the Company or any of its Subsidiaries.

          "Governmental Contract" means any prime contract, subcontract, teaming
agreement or arrangement, joint venture, option, basic ordering agreement,
forward pricing rate agreement, letter contract, purchase order, delivery order,
Bid, change order, task order, arrangement or other commitment of any kind
relating to the business of the Company or any of its Subsidiaries between the
Company and/or any of its Subsidiaries and (1) any Governmental Entity, (2) any
prime contractor to a Governmental Entity or (3) any subcontractor with respect
to any contract described in clause (1) or (2).

     3.25 Certain Approvals. The Board has approved the Merger and this
Agreement, and such approval is sufficient to render inapplicable to the Merger
and this Agreement the limitations on business combinations contained in any
restrictive provision of any "fair price," "moratorium," "control share
acquisition," "interested stockholder" or other similar anti-takeover statute or
regulation (including, without limitation, Section 203 of the GCL) or
restrictive provision of any applicable anti-takeover provision in the Company's
Certificate of Incorporation (including Article Fourteenth) or Bylaws.

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<PAGE>   82


     3.26 Relationships with Customers, Suppliers and Representatives. The
Company has not received written notice and has no knowledge that any customer,
supplier, or sales representative intends to cancel, terminate or otherwise
modify its relationship with the Company or any Subsidiary which would have a
Material Adverse Effect on the Company.

     3.27 Permits. The Company and its Subsidiaries hold, and there are in full
force and effect, all permits, authorizations, licenses, permissions, or
consents of any Governmental Entity or other person or entity that are required
to be held by the Company or any of its Subsidiaries to own, maintain and
operate the assets and properties owned or leased by the Company or its
Subsidiaries or conduct their respective activities as currently conducted and
are material to the operations of the Company and its Subsidiaries, each of
which is described on Schedule 3.27 (the "Company Permits"). Except as described
on Schedule 3.27, (i) neither the Company nor any of its Subsidiaries is in
default (without regard to requirements of notice, lapse of time, or elections
of other persons, or any combination thereof) under any provision of the Company
Permits, (ii) neither the Company nor any of its Subsidiaries has received any
notice of any threatened cancellation, modification or non-renewal of any
Company Permit, and (iii) to the best of the Company's knowledge, no basis for
any such cancellation, modification or non-renewal exists.

     3.28 Company Action. The Board, at a meeting duly called and held, has,
with knowledge of the terms and conditions in this Agreement, (i) determined
that the Merger is advisable, fair to and in the best interests of the Company
and its stockholders, (ii) approved and adopted this Agreement and the
transactions contemplated hereby, including the Merger, and such approval
constitutes approval of the Merger for purposes of Section 203 of the Delaware
General Corporation Law (the "GCL"), and (iii) resolved to recommend that the
stockholders of the Company approve and adopt this Agreement and the
transactions contemplated by this Agreement; provided, however, that such
recommendation and approval may be withdrawn, modified or amended to the extent
specifically set forth in Section 6.1(c).

     3.29 Opinion of Financial Advisor. CIBC World Markets Corp. has rendered to
the Board an opinion to the effect that, as of the date of such opinion, the
Merger Consideration is fair, from a financial point of view, to the holders of
the Shares. The Company has provided to Acquiror a true and correct copy of such
opinion and has obtained the consent of CIBC World Markets Corp., subject to its
prior approval of the language used in connection with the reference, to the
reference thereto in the Proxy Statement and the inclusion in the Proxy
Statement of a copy of such written opinion.

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                                   ARTICLE IV

           REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND ACQUISITION

     Each of Acquiror and Acquisition represents and warrants to the Company as
follows:

     4.1 Organization. Each of Acquiror and Acquisition is a corporation duly
organized, validly existing and in good standing under the laws of the state of
its incorporation and each has the requisite corporate power and authority to
own, lease and operate the properties that it purports to own, lease or operate
and to carry on its business as it is now being conducted, except where the
failure to be so existing and in good standing or to have such power and
authority would not, individually or in the aggregate, have a material adverse
effect on Acquiror and its subsidiaries, taken as a whole.

     4.2 Authority Relative to this Agreement. Each of Acquiror and Acquisition
has full power and authority to execute and deliver this Agreement and to carry
out its obligations hereunder. The execution and delivery of this Agreement by
Acquiror and Acquisition and the consummation by Acquiror and Acquisition of the
transactions contemplated hereby have been duly and validly authorized by all
necessary corporate action on the part of Acquiror and Acquisition. This
Agreement has been duly executed and delivered by Acquiror and Acquisition and,
assuming the due authorization, execution and delivery of this Agreement by the
Company, constitutes a legal, valid and binding agreement of Acquiror and
Acquisition, enforceable against Acquiror and Acquisition in accordance with its
terms, subject to (i) any applicable bankruptcy, insolvency or other similar
laws now or hereafter in effect affecting creditors' rights generally, and (ii)
general principles of equity (regardless of whether enforcement is considered in
a proceeding in equity or at law).

     4.3 Consents and Approvals; No Violation. None of the execution and
delivery of this Agreement by Acquiror and Acquisition, the consummation by
Acquiror and Acquisition of the transactions contemplated hereby or compliance
by Acquiror and Acquisition with any of the provisions hereof will (i) conflict
with or result in a breach of any provision of the certificate of incorporation
or Bylaws of Acquiror or Acquisition, (ii) require any consent, approval,
authorization or permit of, or filing with or notification to, any Governmental
Entity by Acquiror or Acquisition, except (A) pursuant to the Exchange Act, the
Securities Act, certain state takeover statutes, the HSR Act and (B) for filing
the Certificate of Merger pursuant to the GCL, (iii) result in a default (or an
event which with notice or lapse of time or both would become a default) or give
to any third party any right of termination, cancellation, amendment or
acceleration under, or result in the creation of a lien or encumbrance on any of
the assets of Acquiror or Acquisition pursuant to, any note, license, agreement
or other instrument or obligation to which Acquisition is a party or by which
Acquiror or Acquisition or any of their respective assets may be bound or
affected or (iv) violate or conflict with any order, writ, injunction, decree,
statute, rule or regulation applicable to Acquiror or Acquisition or any of
their respective assets; other than (A) such defaults, rights of termination,
cancellation,

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<PAGE>   84


amendment or acceleration, such liens and encumbrances, as set forth pursuant to
clauses (ii) and (iii) above and (B) such consents, approvals, authorizations,
permits or filings, as set forth pursuant to clause (iv) above, the failure to
obtain which, in the aggregate, would not have a material adverse effect on the
ability of Acquiror and Acquisition to perform their obligations set forth
herein or consummate the transactions, contemplated hereby.

     4.4 Proxy Statement. The information relating to Acquisition or Acquiror
provided to the Company by Acquisition or Acquiror specifically for inclusion in
the Proxy Statement will, at the time the Proxy Statement is first sent to
stockholders, at the time of the Special Meeting or at the Effective Time, not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary in order to make the statements
made therein, in light of the circumstances under which they were made, not
misleading.

     4.5 Financing. Acquiror (i) has received fully executed written
commitments, copies of which have been provided to the Company (the "Financing
Commitments"), to provide the funds necessary to satisfy all of Acquiror's and
Acquisition's obligations under this Agreement and in connection with the
transactions contemplated hereby and (ii) subject to the satisfaction of the
conditions to Acquiror's and Acquisition's obligations stated in Article VII,
will have at the Effective Time the necessary financing to perform such
obligations.

     4.6 No Violation of the Margin Rules. None of the transactions contemplated
by this Agreement will violate or result in the violation of Section 7 of the
Exchange Act or any regulation promulgated pursuant thereto, including, without
limitation, Regulations G, T, U or X of the Board of Governors of the Federal
Reserve System.

     4.7 Brokers. None of Acquiror or Acquisition or any of their respective
officers, directors or employees has employed any broker, finder or investment
banker or incurred any liability, which would be payable by the Company, for any
brokerage, finder's or other fees or commissions in connection with the
transactions contemplated by this Agreement.

                                    ARTICLE V

                     CONDUCT OF BUSINESS PENDING THE MERGER

     Except as otherwise specifically provided in this Agreement, from the date
of this Agreement to the Effective Time, the Company shall, and shall cause each
of the Subsidiaries to, conduct its operations only in the ordinary and usual
course of business and consistent with past practices and shall use its best
efforts, and shall cause each of the Subsidiaries to use their best efforts, to
preserve intact its present business organization, keep available the services
of its present officers, employees and consultants and preserve its present
relationships with licensors, licensees, customers, suppliers, employees, labor
organizations and others having business relationships with it. Without limiting
the

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generality of the foregoing, and except as otherwise specifically provided
in this Agreement, the Company shall not, and shall not permit any Subsidiary
to, directly or indirectly, prior to the Effective Time, without the prior
written consent of Acquiror and Acquisition:

          (a) propose or adopt any amendment to or otherwise change its
Certificate of Incorporation or Bylaws except as contemplated by this Agreement;

          (b) authorize for issuance, sale, pledge, disposition or encumbrance,
or issue, sell, pledge, dispose of or encumber (whether through the issuance or
granting of options, warrants, commitments, subscriptions, rights to purchase,
convertible securities or otherwise), any capital stock of any class, any Voting
Debt or any other securities of, or any other ownership interest (including but
not limited to stock appreciation rights, phantom stock or stock-based
performance units) in, the Company or any Subsidiary (except for the issuance of
shares of Common Stock upon the exercise of Company Options granted under the
Stock Option Plans and the Employee Stock Purchase Plan and set forth on
Schedule 3.2(a)), or amend any of the terms of any such securities or agreements
outstanding on the date hereof, other than pursuant to the terms of this
Agreement;

          (c) reclassify, combine, split or subdivide any shares of its capital
stock, or declare, set aside or pay any dividend or other distribution (whether
in cash, securities or property or any combination thereof) in respect of any
class or series of its capital stock;

          (d) redeem, purchase or otherwise acquire, or propose or offer to
redeem, purchase or otherwise acquire, any outstanding Shares or other
securities of the Company or any Subsidiary or any securities convertible into
or exchangeable or exercisable for any Shares or other securities of the Company
or its Subsidiaries;

          (e) (i) incur, assume or prepay any material liability, including,
without limitation, any indebtedness for borrowed money, (ii) assume, guarantee,
endorse or otherwise become liable or responsible (whether directly,
contingently or otherwise) for the obligations of any third party, (iii) make
any loans, advances or capital contributions to, or investments in, any third
party, (iv) mortgage or pledge any of its material assets, tangible or
intangible, or create or suffer to exist any material lien thereupon, or (v)
make any commitments for or authorize any new capital expenditures in excess of
$50,000 individually and $500,000 in the aggregate;

          (f) except as required by law or pursuant to the terms of this
Agreement and except for amendments to the Employee Stock Purchase Plan to
provide that (i) if the Merger is to occur on or prior to June 30, 2000, the
last day of the six-month period shall be the day immediately prior to the day
on which the Merger occurs and (b) if the Merger is to occur after June 30,
2000, the Plan will be terminated effective on the day immediately prior to the
day on which the Merger is to occur and the moneys in participants' accounts
will be returned to them, enter into, adopt, terminate or amend in any material
respect any bonus, profit sharing, compensation, termination, stock option,

                                      A-26

<PAGE>   86


stock appreciation right, restricted stock, performance unit, pension,
retirement, deferred compensation, employment, severance, termination pay or
other employee benefit agreement or arrangement, labor agreement, trust, plan,
fund or other arrangement for the benefit or welfare of any director, officer or
employee, or, except in the ordinary course of business consistent with past
practice, increase in any material manner the compensation or fringe benefits of
any director, officer or employee, or pay any benefit not required by any
existing plan and arrangement including, without limitation, the granting of
stock options, stock appreciation rights, shares of restricted stock or
performance units;

          (g) enter into any agreement, contract, commitment or transaction
other than in the ordinary course of business, consistent with past practices;

          (h) waive, assign, release or relinquish any material rights, cancel
any material (individually or in the aggregate) indebtedness, waive the benefits
of or agree to modify in any manner any confidentiality, standstill or similar
agreement to which the Company or any Subsidiary is a party, or permit any
insurance policy naming it as a beneficiary or loss payable payee, including the
Insurance Policies, to be cancelled or terminated;

          (i) authorize, recommend, propose or enter into or announce an
intention to authorize, recommend, propose or enter into an agreement in
principle or a definitive agreement with respect to any merger, consolidation,
reorganization, recapitalization, liquidation, dissolution, or business
combination, any acquisition of a material amount of assets or securities, or
any disposition of a material amount of assets or securities;

          (j) except as may be required as a result of a change in law or in
GAAP, change any of the accounting principles or practices used by it or revalue
in any respect any of its material assets, including writing down the value of
inventory or writing-off notes or accounts receivable, other than in the
ordinary course of business consistent with past practices;

          (k) make, revoke or amend any tax election, settle or compromise any
federal, state, local or foreign income tax liability, waive or extend the
statute of limitations in respect of any such taxes or enter into or amend any
agreement with any tax authority;

          (l) pay, discharge, settle, compromise or satisfy any material claims,
liabilities or obligations (absolute, accrued, asserted or unasserted,
contingent or otherwise) other than the payment, discharge or satisfaction in
the ordinary course of business, consistent with past practices, of liabilities
reflected or reserved against in the Balance Sheet or incurred in the ordinary
course of business consistent with past practices since the date thereof;

          (m) fail to maintain in full force and effect any Company Permit,
Environmental Permit or license (including contractor and professional
engineering

                                      A-27

<PAGE>   87


licenses and qualifications to transact business) other than in the ordinary
course of business consistent with past practices; or

         (n) commit or agree (in writing or otherwise) to take any of the
foregoing actions or any action or allow any other event to occur which would
make any representation or warranty in this Agreement materially untrue or
incorrect, including as of the date hereof and as of the Effective Time, as if
made as of such time.

                                   ARTICLE VI

                              ADDITIONAL AGREEMENTS

     6.1 No Solicitation.

         (a) For purposes of this Agreement:

             (i) "Alternative Proposal" means any inquiry, proposal or offer,
whether written or oral and whether or not delivered to the Company's
stockholders generally, from any person or Group relating to any direct or
indirect acquisition or purchase of any material portion of the assets of the
Company and its Subsidiaries taken as a whole, or 20% or more of any class of
equity securities of the Company or any of its Subsidiaries, or any tender offer
or exchange offer (including by the Company or its Subsidiaries) that if
consummated could result in any person or Group beneficially owning 20% or more
of any class of equity securities of the Company or any of its Subsidiaries, or
any merger, consolidation, business combination, sale of all or substantially
all assets, recapitalization, liquidation, dissolution or similar transaction
involving the Company or any of its subsidiaries, other than the transactions
contemplated by this Agreement.

             (ii) "Superior Proposal" means a bona fide offer, whether written
or oral, made by a third party to acquire, directly or indirectly, including
pursuant to a tender offer, exchange offer, merger, consolidation, business
combination, recapitalization, liquidation, dissolution or similar transaction,
for consideration consisting of cash and/or securities, more than 50% of the
total outstanding voting securities of the Company or all or substantially all
the assets of the Company, which offer is otherwise on terms which the Board
determines in its good faith judgment (after consultation with a financial
advisor of nationally recognized reputation) to be reasonably likely to be
completed (taking into account all material legal, financial, regulatory and
other aspects of the proposal and the person, entity or Group making the
proposal) and more favorable to the Company's stockholders from a financial
point of view than the Merger, and for which financing, to the extent required,
is then committed or which, in the good faith judgment of the Board, is as
likely to be obtained by such third party as is the financing of Acquiror
pursuant to the Financing Commitments.

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<PAGE>   88


             (iii) "Representative" means any of the officers, directors,
employees or agents of, or any investment banker, attorney, accountant or other
advisor or representative retained by, the Company or its Subsidiaries.

             (iv) "Group" means any group as defined under Section 13(d) of the
Exchange Act and the rules and regulations thereunder.

         (b) From and after the date of this Agreement until the earlier of the
Effective Time or termination of this Agreement pursuant to its terms, the
Company shall not and shall direct its Representatives not to and shall cause
the Subsidiaries and their Representatives not to, directly or indirectly,
encourage, solicit, participate in or initiate discussions or negotiations with
or provide any information to any person, entity or Group concerning any actual
or potential Alternative Proposal. The Company represents and warrants to
Acquiror and Acquisition that it, its Subsidiaries and their respective
Representatives have ceased any and all existing activities, discussions or
negotiations with any persons, entities or Groups conducted heretofore with
respect to any Alternative Proposal. Any violation of the restrictions set forth
in this Section 6.1(b) by any Representative of the Company or any of its
Subsidiaries shall be deemed to be a material breach of this Agreement by the
Company.

         (c) (i) If the Board reasonably determines in good faith, after taking
into account the advice of its outside legal counsel, that it is necessary to do
so in order to comply with its fiduciary duties to the Company's stockholders
under applicable law, the Company and its Representatives may, in response to a
Superior Proposal that was unsolicited or that did not otherwise result from a
breach of this Section 6.1, furnish non-public information with respect to the
Company and participate in discussions and negotiations regarding such Superior
Proposal if the person, entity or Group submitting the Superior Proposal has
signed a confidentiality agreement usual and customary with respect to
transactions contemplated by the Superior Proposal. The Company shall furnish to
Acquiror any non-public information furnished pursuant to the preceding sentence
at the same time the Company furnishes such information to the person, entity or
Group submitting the Superior Proposal.

             (ii) The Company shall promptly following receipt of any written
Alternative Proposal (and in any event not later than 24 hours after receipt
thereof), notify Acquiror of the receipt of the Alternative Proposal.

             (iii) If the Board reasonably determines in good faith, after
taking into account the advice of its outside legal counsel, that it is
necessary to do so in order to comply with its fiduciary duties to the Company's
stockholders under applicable law, the Board may withdraw or modify its approval
or recommendation of this Agreement or the Merger, approve or recommend a
Superior Proposal, or enter into an Acquisition Agreement with respect to a
Superior Proposal, if the Company has (w) given Acquiror written notice (a
"Notice of Superior Proposal") advising Acquiror that the Board has received a
Superior Proposal specifying the material terms and conditions of the Superior
Proposal (including the proposed financing), identifying the person making such
Superior

                                      A-29

<PAGE>   89


Proposal and including a copy of the Superior Proposal, (x) afforded Acquiror
three business days from the date the Notice of Superior Proposal was received
by Acquiror to propose to the Company such modifications to the transactions
contemplated by this Agreement as Acquiror may elect (a "Modified Proposal") and
(y) negotiated with Acquiror in good faith during the three business days
following the date on which the Notice of Superior Proposal was received by
Acquiror to enable Acquiror to negotiate a Modified Proposal during such three
business day period such that the subject Superior Proposal no longer
constitutes a Superior Proposal. Any amendment to the price or material terms of
a Superior Proposal shall require an additional Notice of Superior Proposal and
an additional three business day period thereafter, to the extent permitted
under applicable law, prior to public disclosure by the Board of its
recommendation with respect thereto.

         (d) Nothing contained in this Section 6.1 or elsewhere in this
Agreement shall prohibit the Company from (i) taking and disclosing to its
stockholders a position contemplated by Rules 14d-9 and 14e-2(a) under the
Exchange Act or (ii) making any disclosure to the Company's stockholders if, in
the good faith judgment of the Board, after taking into account the advice of
its outside legal counsel, disclosure is required under applicable law,
provided, that neither the Company nor the Board nor any committee thereof
shall, except in strict compliance with the provisions of Section 6.1(c),
withdraw or modify, or publicly propose to withdraw or modify, its position with
respect to this Agreement or the Merger or approve or recommend, or propose to
approve or recommend, an Alternative Proposal.

     6.2 Access to and Delivery of Information. From the date of this Agreement,
the Company shall, and shall cause its officers, directors, employees, auditors,
agents and subsidiaries, and the officers, directors, employees, auditors and
agents of each Subsidiary to, give Acquiror and Acquisition and each source of
financing for Acquiror in connection with the Merger (each a "Financing Source")
and the officers, employees, counsel, advisors and representatives of Acquiror,
Acquisition and each Financing Source (the "Agents"), access during regular
business hours to all officers, employees, agents, offices, properties, and
other facilities and to all books and records of the Company and each
Subsidiary, permit Acquiror, Acquisition and each Financing Source to make such
inspections and conduct such testing as it may require, and furnish Acquiror,
Acquisition and each Financing Source with such financial, operating,
environmental and other data and information as Acquiror or Acquisition, through
their Agents, may from time to time reasonably request. Acquisition and Acquiror
shall hold and shall cause their Agents to hold all information provided
pursuant to this Section 6.2 confidential to the extent required by the terms of
the Confidentiality Agreement. The Company shall furnish promptly to Acquiror
and Acquisition a copy of each report, schedule, registration statement and
other document filed by it or its Subsidiaries during such period pursuant to
the requirements of federal, state or foreign securities laws. The Company will
deliver or make available to Acquiror a true and complete copy of each of the
Company Permits within 10 days after the date of this Agreement. No
investigation made by Acquiror, Acquisition or any Agent pursuant to this
Section 6.2 shall affect any representations or warranties of the parties
contained in this Agreement or any conditions to their obligations hereunder.

                                      A-30

<PAGE>   90


     6.3 Public Announcement. Acquiror and the Company shall consult with each
other before issuing any press release or otherwise making any public statements
with respect to any of the transactions contemplated by this Agreement, shall
provide to the other party for review a copy of any such press release or
statement a reasonable time prior to such release or statement and shall not
issue any such press release or make any such public statement prior to such
consultation and review, except where advised by outside legal counsel that
consultation is not practicable in order to comply with applicable law or any
listing agreement with applicable securities exchanges.

     6.4 Indemnification and Insurance.

         (a) Acquisition and Acquiror hereby acknowledge the existence and
continued effect of and agree to cause the Surviving Corporation to honor in
accordance with their respective terms certain indemnity agreements (the
"Indemnity Agreements") listed on Schedule 6.4(a), true and complete copies of
which the Company has provided to Acquiror, that are outstanding as of the date
hereof between the Company and certain of the Company's former and existing
directors and officers.

         (b) All rights to indemnification existing in favor of the present or
former directors, officers, employees, fiduciaries and agents of the Company or
any of its Subsidiaries (collectively, the "Indemnified Parties") as provided in
the certificate or articles of incorporation, bylaws or similar documents of any
of the Company or any of its Subsidiaries as in effect as of the date hereof (as
reflected in such documents provided to Acquiror prior to the date of this
Agreement) with respect to matters occurring prior to the Effective Time shall
survive the Merger and shall continue in full force and effect for a period of
not less than six years unless and to the extent otherwise required by
applicable law.

         (c) Acquiror shall cause the Company, and from and after the Effective
Time, the Surviving Corporation, to purchase a six-year extended reporting
period endorsement under the current policy of directors' and officers'
liability insurance maintained by the Company set forth on Schedule 3.19(a), a
true and complete copy of which the Company has provided to Acquiror; provided
that (i) the Surviving Corporation may substitute therefor other policies not
less advantageous (other than to a de minimis extent) to the beneficiaries of
the current policies, (ii) such substitution shall not result in any gaps or
lapses in coverage with respect to matters occurring prior to the Effective Time
and (iii) the Surviving Corporation shall not be required to pay an annual
premium for such coverage in excess of 150% of the last annual premium paid (the
"Maximum Premium") by the Company prior to the date hereof (which the Company
represents to be $102,000 for the 12-month period ended July 1, 2000). If the
Surviving Corporation is unable to obtain the insurance required by this Section
6.4(c) for the Maximum Premium it shall obtain as much comparable insurance as
possible for an annual premium equal to the Maximum Premium.

     6.5 Continuation of Benefits. During the period from the Effective Time
through the first anniversary thereof, Acquiror shall maintain or cause to be
maintained wages,

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<PAGE>   91


compensation levels, employee pension and welfare plans for the benefit of
employees and former employees of the Company and the Subsidiaries, which are,
in the aggregate, substantially the same as or not materially less favorable in
the aggregate than those generally in effect with respect to similarly situated
employees of Acquiror. Buyer shall maintain the Company's existing medical,
health and dental employee benefit plans ("Existing Company Medical Plans") in
effect from the Effective Time through December 31, 2000. For all Employee
Benefits of Acquiror and its affiliates after the Effective Time, Acquiror
shall, to the extent permitted under its benefit plans, cause all service with
the Company or any of its Subsidiaries prior to the Effective Time of employees
to be treated as service with Acquiror and its affiliates for eligibility,
vesting and benefit accrual purposes to the same extent that such service is
taken into account by the Company and its Subsidiaries as of the date hereof,
except to the extent such treatment will result in duplication of benefits. From
and after the Effective Time, Acquiror shall, to the extent permitted under the
relevant plan and within Acquiror's control, (i) cause any pre-existing
condition or limitation and any eligibility waiting periods (to the extent such
limitations or waiting periods did not apply to the employees of the Company
under its plans in existence as of the date hereof) under any group health plans
of Acquiror or any of its Subsidiaries to be waived with respect to employees of
the Company and their eligible dependents and (ii) give each employee of the
Company credit for the plan year in which the Effective Time occurs toward
applicable deductions and annual out-of-pocket limits for expenses incurred
prior to the Effective Time (or such later date on which participation
commences) during the applicable plan year. "Employee Benefits" shall mean
benefits provided under any of the following employee plans: medical, health,
dental, life insurance, long-term disability, severance, pension, retirement or
savings plan, policy or arrangement, including those such plans for which
coverage is generally limited to officers or a select group of highly
compensated employees. If so requested by Acquiror, the Company shall,
immediately prior to the Effective Time, cause to be terminated any one or more
Company Plans (as that term is defined in Section 3.10), other than Existing
Company Medical Plans, by taking all such corporate action, preparing, filing
and furnishing all such notices to employees, trustees, insurance companies,
service providers and Governmental Entities as may be necessary or appropriate,
and making arrangements for the distribution of assets as may be required in
order to effectuate such termination prior to the Effective Time.

     6.6 Severance Policy and Other Agreements. Except as contemplated by
Section 7.3(g), Acquiror shall honor or cause to be honored all severance and
retention agreements and employment agreements with the Company's directors,
officers and employees set forth on Schedule 6.6. The Company represents and
warrants that it has provided to Acquiror true and complete copies of such
agreements.

     6.7 Reasonable Efforts. Subject to the terms and conditions herein, each of
the parties hereto agrees to use its reasonable best efforts to take or cause to
be taken all action, and to do, or cause to be done, all things necessary,
proper or advisable to consummate and make effective as promptly as practicable
the transactions contemplated by this Agreement and to obtain in a timely manner
all waivers, consents and approvals

                                      A-32

<PAGE>   92


of, and to make all filings with and notifications to, any Governmental Entity
or any other third parties as are necessary in order to consummate the
transactions contemplated by this Agreement, including but not limited to
cooperation in the preparation and filing of the Proxy Statement, any required
filings under the HSR Act, or other foreign filings and any amendments to any
thereof. In addition, if at any time prior to the Effective Time any event or
circumstance relating to either the Company or Acquiror or Acquisition or any of
their respective subsidiaries should be discovered by the Company or Acquiror,
as the case may be, which should be set forth in the Proxy Statement, the
discovering party promptly shall inform the other parties of such event or
circumstance. If at any time after the Effective Time any further action is
necessary or desirable to carry out the purposes of this Agreement, including
the execution of additional instruments, the proper officers and directors of
each party to this Agreement shall take all such necessary action. The Company
shall use its reasonable best efforts to take or cause to be taken all action,
and to do, or cause to be done, all things necessary, proper or advisable to
ensure that the Surviving Corporation has the full benefit of all of the
Environmental Permits after the Effective Time.

     6.8 Proxy Statement.

         (a) The Company shall, in accordance with applicable law:

             (i) duly call, give notice of, convene and hold a special meeting
of its stockholders as soon as practicable after the date of this Agreement for
the purpose of approving and adopting this Agreement and the transactions
contemplated hereby, including the Merger, for the purpose of considering and
taking action upon this Agreement (the "Special Meeting") and shall not, unless
required by applicable laws to do so, adjourn, postpone or cancel (or propose to
adjourn, postpone or cancel) such Special Meeting without the prior consent of
Acquiror;

             (ii) subject to Section 6.1(c), include in the Proxy Statement the
recommendation of the Board that the stockholders of the Company vote in favor
of the approval and adoption of this Agreement and the transactions contemplated
hereby, including the Merger; and

             (iii) use its best efforts to (A) obtain and furnish the
information required to be included by it in the Proxy Statement, file the
preliminary Proxy Statement with the SEC on or before April 17, 2000 and, after
consultation with Acquiror and Acquisition, respond promptly to any comments
made by the SEC with respect to the Proxy Statement and any preliminary version
thereof and cause the Proxy Statement to be mailed to its stockholders at the
earliest practicable time following the date of this Agreement and (B) solicit
from the stockholders of the Company proxies in favor of the approval and
adoption of this Agreement and the transactions contemplated hereby, including
the Merger, and, subject to Section 6.1(c), take all other actions reasonably
necessary or advisable to secure the approval and adoption of this Agreement and
the transactions contemplated hereby, including the Merger, by the Company's
stockholders.

                                      A-33

<PAGE>   93


         (b) The Company shall promptly correct the Proxy Statement if and to
the extent that it becomes false or misleading in any material respect (and each
of Acquiror and Acquisition, with respect to written information supplied by it
specifically for use in the Proxy Statement, shall promptly notify the Company
of any required corrections of such information and cooperate with the Company
with respect to correcting such information), shall supplement the information
contained in the Proxy Statement to include any information that becomes
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading (and each of Acquiror and Acquisition
shall supplement the information provided by it specifically for use in the
Proxy Statement to include any information that shall become necessary in order
to make the statements therein that are based on such provided information, in
light of the circumstances under which they were made, not misleading), and
shall take all steps necessary to cause the Proxy Statement, as so corrected or
supplemented, to be filed with the SEC and disseminated to the Company's
stockholders, in each case to the extent required by applicable federal
securities laws. Acquiror and its counsel shall be given a reasonable
opportunity to review and comment on the Proxy Statement prior to its filing
with the SEC or dissemination to the stockholders of the Company. The Company
shall provide to Acquiror and its counsel any comments and correspondence the
Company or its counsel may receive from the SEC with respect to the Proxy
Statement promptly after receipt thereof.

         (c) The Company shall, or shall cause its transfer agent to, make all
stock records and other records relating to the Shares and the Company's
stockholders available to Acquiror and Acquisition as is necessary or advisable
to effect the intent of this Agreement.

     6.9 Notification of Certain Matters; Equitable Relief.

         (a) The Company shall give prompt written notice to Acquiror, and
Acquiror shall give prompt written notice to the Company, of the occurrence (or
nonoccurrence) of any event, the occurrence (or nonoccurrence) of which would be
likely to cause any representation or warranty contained in this Agreement to be
untrue or inaccurate in any material respect and of any material failure of
either party to comply with or satisfy any covenant, condition or agreement to
be complied with or satisfied by it hereunder; provided, however, that delivery
of any notice pursuant to this Section 6.9 shall not limit or otherwise affect
the remedies available to either party hereunder.

         (b) Each of the Company, Acquiror and Acquisition shall give prompt
written notice to the other parties hereto of any notice or other communication
from any third party alleging that the consent of such third party is or may be
required in connection with the transactions contemplated by this Agreement.

         (c) The parties hereto agree that irreparable damage would occur in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and

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<PAGE>   94


to enforce specifically the terms and provisions hereof in any court of the
United States or any state having jurisdiction, this being in addition to any
other remedy to which they are entitled at law or in equity.

     6.10 Antitrust Notification. Each of the Company and Acquiror shall as
promptly as practicable, but in no event later than ten (10) business days
following the execution of this Agreement, file with the United States Federal
Trade Commission and the United States Department of Justice the notification
and report form, if any, required for the transactions contemplated hereby and
any supplemental information requested in connection therewith pursuant to the
HSR Act. Each of the parties hereto shall use commercially reasonable efforts to
obtain any clearance required under the HSR Act for the consummation of the
transactions contemplated hereby; provided; however, that nothing contained
herein shall require (i) Acquiror or any of its subsidiaries to divest or hold
separate any portion of its assets or the assets of the Company or (ii) the
Company or any of its subsidiaries to divest or hold separate any portion of its
assets.

     6.11 Takeover Statutes. If any state takeover statute or other similar
statute or regulation becomes or is deemed to become applicable to the Merger,
this Agreement or any of the transactions contemplated hereby, the Company shall
promptly use its reasonable best efforts to take all action necessary to render
such statute or regulation inapplicable to all of the foregoing.

                                   ARTICLE VII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

     7.1  Conditions to Each Party's Obligation to Effect the Merger. The
respective obligations of each party hereto to consummate the Merger is subject
to the satisfaction at or prior to the Effective Time of the following
conditions:

          (a) this Agreement shall have been adopted by the affirmative vote of
the stockholders of the Company by the requisite vote in accordance with the
Company's Certificate of Incorporation as in effect on the date hereof and the
GCL;

          (b) no statute, rule, regulation, executive order, decree, ruling or
injunction shall have been enacted, entered, promulgated or enforced by any
court or Governmental Entity of competent jurisdiction and be in effect which
prohibits, restrains, enjoins or restricts the consummation of the Merger; and

          (c) any waiting period applicable under the HSR Act shall have
terminated or expired.

     7.2  Conditions to Obligation of the Company to Effect the Merger. The
obligation of the Company to effect the Merger is further subject to the
satisfaction at or prior to the Effective Time of the following conditions, any
one or both of which may be waived by the Company:

                                      A-35

<PAGE>   95


         (a) each of Acquiror and Acquisition shall have performed in all
material respects each of its obligations under this Agreement required to be
performed by it at or prior to the Effective Time pursuant to the terms hereof;
and

         (b) Acquiror and Acquisition shall not have materially breached any of
their material representations or warranties in the Merger Agreement (without
giving effect to any limitation as to materiality or Material Adverse Effect in
such representations and warranties).

     7.3 Conditions to Obligation of Acquiror and Acquisition to Effect the
Merger. The obligation of Acquiror and Acquisition to effect the Merger is
further subject to the satisfaction at or prior to the Effective Time of the
following conditions, any one or more of which may be waived by Acquiror and
Acquisition:

         (a) the Company shall have performed in all material respects each of
its obligations under this Agreement required to be performed by it at or prior
to the Effective Time pursuant to the terms hereof;

         (b) there shall not have been any regulation, legislation, statute,
rule, injunction, judgment or other order promulgated, enacted, entered or
enforced or deemed applicable to the Merger by any Governmental Entity and be in
effect (other than the routine application to the Merger or other subsequent
business combination of waiting periods under the HSR Act), that in the
reasonable judgment of Acquiror prohibits or limits or seeks to prohibit or
limit the ownership or operation by Acquiror or Acquisition or any other
affiliate of Acquiror of all or any portion of the business or assets of the
Company and the Subsidiaries or of Acquiror or Acquisition or any other
affiliate of Acquiror or compels or seeks to compel Acquiror or Acquisition or
any other affiliate of Acquiror to dispose of or to hold separately all or any
portion of the business or assets of the Company or any of the Subsidiaries or
of Acquiror or Acquisition or any other affiliate of Acquiror, or imposes or
seeks to impose any limitation on Acquiror or Acquisition or any other affiliate
of Acquiror to conduct their business or own such assets;

         (c) there shall have been instituted or pending any action, proceeding
or counterclaim by any Governmental Entity, challenging the consummation of the
Merger, or seeking to, directly or indirectly, result in any of the consequences
referred to in clause (b) above;

         (d) no Material Adverse Effect shall have occurred;

         (e) the Company shall not have materially breached any of its material
representations or warranties in the Merger Agreement (without giving effect to
any limitation as to materiality or Material Adverse Effect in such
representations and warranties);

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<PAGE>   96


         (f) there shall not have occurred (i) any general suspension of trading
in, or limitation on prices for, securities on any national securities exchange
or in the over-the-counter market in the United States, (ii) any limitation
(whether or not mandatory) by any Governmental Entity on, or other event or
circumstance that materially and adversely affects, the extension of credit by
banks or other lending institutions, (iii) any banking moratorium declared by
New York, Texas or United States authorities, any material adverse change in the
market for syndicated facilities similar in nature to the credit facilities of
Acquiror or any material disruption of, or material adverse change in,
financial, banking or capital markets generally, in each case as determined by
Acquiror in its sole reasonable discretion, (iv) a commencement of a war, armed
hostilities or other national or international crisis involving the United
States or (v) in the case of any of the foregoing existing at the time of the
execution of the Merger Agreement, a material acceleration or worsening thereof;
and

         (g) the Company shall have $14.5 million of available cash prior to
payment of (i) amounts payable pursuant to Section 1.9(a), and (ii) transaction
fees and expenses incurred by the Company in connection with the transactions
contemplated by this Agreement.

                                  ARTICLE VIII

                         TERMINATION; AMENDMENT; WAIVER

     8.1 Termination. This Agreement may be terminated and the Merger
contemplated hereby may be abandoned at any time prior to the Effective Time by
written notice, notwithstanding approval thereof by the stockholders of the
Company:

         (a) by mutual written consent duly authorized by the Board of Directors
of Acquiror and the Board;

         (b) by either Acquiror or the Company if:

             (i) a Governmental Entity shall have issued an order, decree or
ruling or taken any other action, in any case having the effect of permanently
restraining, enjoining or otherwise prohibiting the Merger, which order, decree,
ruling or other action is final and nonappealable; provided, that the party
seeking to terminate this Agreement shall have used its reasonable efforts to
remove, lift, vacate or reverse such order, decree or ruling; or

             (ii) the Board has recommended, or the Company has entered into an
Acquisition Agreement with respect to, an Alternative Proposal except that the
Company may not exercise its right to terminate the Agreement pursuant to this
Section 8.1(b)(ii) unless the Acquisition Agreement is with respect to a
Superior Proposal, the Company has strictly complied with the terms and
procedures set forth in Section 6.1 and prior to such termination the Company
has paid the Termination Fee described in Section 8.3(b); or

                                      A-37

<PAGE>   97


             (iii) if the Merger shall not have been consummated by August 31,
2000 (the "Outside Date"); provided, however, that the right to terminate this
Agreement is not available to any party that is then in material breach of any
of its material covenants, obligations, representations or warranties in this
Agreement (without giving effect to any limitation as to materiality or Material
Adverse Effect in such representations and warranties) or if such party's
material breach has been the cause of, or resulted in, the failure of the Merger
to occur on or before the Outside Date; or

         (c) by Acquiror if:

             (i) the Company shall have failed to include in the Proxy Statement
the recommendation of the Board that the stockholders of the Company approve and
adopt this Agreement and the transactions contemplated hereby, including the
Merger;

             (ii) the Board or any committee thereof shall have (A) withdrawn or
modified (including but not limited to by amendment of or supplement to the
Proxy Statement) or publicly proposed to withdraw or modify in a manner adverse
to Acquiror or Acquisition its approval or recommendation of this Agreement or
the Merger; (B) approved or recommended or publicly proposed to approve or
recommend any Alternative Proposal; (C) resolved to effect any of the foregoing;
or (D) failed to reaffirm publicly and unconditionally its recommendation to the
Company's stockholders to approve and adopt this Agreement and the transactions
contemplated hereby, including the Merger, which public affirmation must be made
within five business days after Acquiror's written request to do so (which
request may be made at any time that an Alternative Proposal is pending) and
must also include the unconditional rejection of such Alternative Proposal (to
the extent not previously publicly withdrawn); or

             (iii) the Company is in material breach of any of its material
covenants, obligations, representations or warranties in this Agreement (without
giving effect to any limitation as to materiality or Material Adverse Effect in
such representations and warranties); provided that if such breach is curable
through the exercise of the Company's commercially reasonable efforts, Acquiror
may not terminate this Agreement under this Section 8.1(c)(iii) unless such
breach is not cured on or prior to the date that is twenty (20) days after
written notice of such breach is given by Acquiror to the Company; or

         (d) by the Company if Acquiror or Acquisition is in material breach of
any of its material covenants, obligations, representations or warranties in
this Agreement (without giving effect to any limitation as to materiality or
Material Adverse Effect in such representations and warranties); provided that
if such breach is curable through exercise of Acquiror's or Acquisition's
commercially reasonable efforts, the Company may not terminate this Agreement
under this Section 8.1(d) unless such breach is not cured on or prior to the
date that is twenty (20) days after written notice of such breach is given by
the Company to Acquiror.

                                      A-38

<PAGE>   98


     8.2 Notice of Termination; Effect of Termination.

         (a) Any termination of this Agreement under Section 8.1 above shall be
effective immediately upon the delivery of written notice by the terminating
party to the other parties hereto.

         (b) In the event of the termination of this Agreement as provided in
Section 8.1, this Agreement shall be of no further force or effect, except (i)
as set forth in this Section 8.2, Section 8.3 and Article IX (miscellaneous),
each of which shall survive the termination of this Agreement, and (ii) nothing
herein shall relieve any party from liability for any breach of this Agreement.

         (c) No termination of this Agreement shall affect the obligations of
the parties contained in the Confidentiality Agreement, all of which obligations
shall survive termination of this Agreement in accordance with their terms.

     8.3 Fees and Expenses.

         (a) The Company shall reimburse Acquiror in the amount of $500,000 as
reimbursement for all of its costs and expenses in connection with this
Agreement and the Merger ("Transaction Expenses") if this Agreement has been
terminated by Acquiror pursuant to Section 8.1(c)(iii), provided that Acquiror
is not in material breach of any of its material covenants, obligations,
representations or warranties in this Agreement (without giving effect to any
limitation as to materiality or material adverse effect in such representations
and warranties), and Acquiror shall reimburse the Company in an amount of
$500,000 as reimbursement for Transaction Expenses if this Agreement has been
terminated by the Company pursuant to Section 8.1(d), provided that the Company
is not in material breach of any of its material covenants, obligations,
representations or warranties in this Agreement (without giving effect to any
limitation as to materiality or Material Adverse Effect in such representations
and warranties).

         (b) If this Agreement is terminated pursuant to Section 8.1(b)(ii) or
Section 8.1(c)(i) or (ii), the Company shall promptly pay Acquiror a termination
fee of $2,500,000 (the "Termination Fee") in immediately available funds by wire
transfer to an account designated by Acquiror.

         (c) In addition to the Company's obligations under Section 8.3(a), if

             (i) this Agreement is terminated pursuant to Section 8.1(c)(iii)
and the Company is unable to prove by a preponderance of the evidence that the
breach by the Company was not willful and prior to the first anniversary of such
termination, the Company enters into a definitive agreement with respect to an
Alternative Proposal or an Alternative Proposal is consummated, or

             (ii) this Agreement is terminated pursuant to Section 8.1(c)(iii)
and the Company proves by a preponderance of the evidence that the breach by the
Company

                                      A-39

<PAGE>   99


was not willful and prior to the first anniversary of such termination, the
Company enters into a definitive agreement with respect to an Alternative
Proposal or an Alternative Proposal is consummated and the consideration per
Share expected to be paid in connection with such transaction is an amount equal
to (x) $11.50, less (y) the amount determined by dividing the Termination Fee by
the number of Shares then outstanding, within one business day of the execution
of such agreement or consummation of such Alternative Proposal, the Company
shall pay Acquiror the Termination Fee less Transaction Expenses previously paid
to Acquiror pursuant to Section 8.3(a) in immediately available funds by wire
transfer to an account designated by Acquiror.

     8.4 Amendment. This Agreement may be amended by action taken by the
Company, Acquiror and Acquisition at any time before or after adoption of the
Merger by the stockholders of the Company (if required by applicable law);
provided, however, that, after any such approval by the stockholders of the
Company, no amendment shall be made that is not otherwise permitted pursuant to
Section 251(d) of the GCL. This Agreement may not be amended except by an
instrument in writing signed on behalf of the parties hereto.

     8.5 Extension; Waiver. At any time prior to the Effective Time, each party
hereto (in the case of the Company, acting through the Board) may (i) extend the
time for the performance of any of the obligations or other acts of the other
party, (ii) waive any inaccuracies in the representations and warranties of the
other party contained herein or in any document, certificate or writing
delivered pursuant hereto or (iii) subject to Section 8.4, waive compliance by
the other party with any of the covenants and agreements contained herein. Any
such extension or waiver shall be valid only if set forth in an instrument in
writing signed on behalf of such party. The failure of any party hereto to
assert any of its rights hereunder shall not constitute a waiver of such rights.

                                   ARTICLE IX

                                  MISCELLANEOUS

     9.1 Non-Survival of Representations and Warranties. The representations and
warranties made in this Agreement shall not survive beyond the Effective Time.
This Section 9.1 shall have no effect upon any covenant, agreement or obligation
whether to be performed before or after the Effective Time.

     9.2 Entire Agreement; Assignment. This Agreement (including the documents,
schedules and instruments referred to herein) together with the Confidentiality
Agreement constitutes the entire agreement between the parties hereto with
respect to the subject matter hereof and thereof and supersedes all other prior
agreements and understandings, both written and oral, between the parties with
respect to the subject matter hereof. This Agreement shall not be assigned by
operation of law or otherwise and any attempted assignment of this Agreement in
violation of this sentence shall be void; provided, however, that Acquiror may
assign

                                      A-40

<PAGE>   100


its rights and Acquisition may assign its rights, interest and obligations to
any wholly-owned subsidiary of Acquiror without the consent of the Company
provided that no such assignment shall relieve Acquiror of any liability for any
breach by such assignee. Nothing in this Section 9.2 shall be deemed to
supersede or terminate the rights of the Company pursuant to the Confidentiality
Agreement.

     9.3 Validity. The invalidity or unenforceability of any provisions of this
Agreement shall not affect the validity or enforceability of any other
provisions of this Agreement, each of which shall remain in full force and
effect.

     9.4 Notices. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be deemed to have been
duly given when delivered in person, by overnight courier, or by registered or
certified mail (postage prepaid, return receipt requested) or confirmed
facsimile transmission to the respective parties as follows:

If to Acquiror or Acquisition:

     MACTEC, Inc.
     1819 Denver West Drive, Suite 400
     Golden, CO 80401
     Attention: J. Michael Zika
     Fax: (303) 273-5000

with a copy to

     Morrison & Foerster LLP
     370 Seventeenth Street, Suite 5200
     Denver, Colorado 80202
     Attention: Bruce D. Stocks
     Fax: (303) 592-1510

If to the Company:

     Harding Lawson Associates Group, Inc.
     707 Seventeenth Street, Suite 2400
     Denver, CO 80202
     Attention: Robert L. Costello, Jr.
     Fax: (303) 293-6105

                                      A-41

<PAGE>   101


with a copy to

     Howard, Rice, Nemerovski, Canady
     Falk & Rabkin, P.C.
     A Professional Corporation
     Three Embarcadero Center, 7th Floor
     San Francisco, California 94111
     Attention: Richard W. Canady
     Fax: (415) 217-5910

or to such other address as the person to whom notice is given may have
previously furnished to the other in writing in the manner set forth above
(provided, that notice of any change of address shall be effective only upon
receipt thereof).

     9.5 Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, regardless of the laws that
might otherwise govern under applicable principles of conflicts of laws thereof.

     9.6 Interpretation. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. When reference is made in this Agreement to a
Section or Article, such reference shall be to a Section or Article of this
Agreement, unless otherwise indicated. Whenever the words "include," "includes,"
or "including" are used in this Agreement, they shall be deemed to be followed
by the words "without limitations." The words "herein," "hereby," "hereof,"
"hereto," "hereunder" and words of similar import refer to this Agreement.

     9.7 Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
together shall constitute one and the same agreement.

     9.8 Parties in Interest. This Agreement shall be binding upon and inure
solely to the benefit of each party hereto, and, except as set forth in Section
6.4, nothing in this Agreement, express or implied, is intended to confer upon
any other person any rights or remedies of any nature whatsoever under or by
reason of this Agreement.

     9.9 Severability. If any term or other provision of this Agreement is
invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in fall force and effect. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible to the fullest extent
permitted by applicable law in an acceptable manner to the end that the
transactions contemplated hereby, subject to the terms and conditions hereof,
are fulfilled to the fullest extent possible.

                                      A-42

<PAGE>   102


     9.10 Attorneys Fees. In the event of any dispute hereunder, the prevailing
party shall be entitled to the recovery of reasonable attorneys fees.

     9.11 Expenses. Except as set forth in Section 8.3(a), all fees, costs and
expenses incurred in connection with this Agreement and the transactions
contemplated hereby shall be paid by the party incurring such fees, costs and
expenses.

     9.12 Waiver of Jury Trial. Each of Acquiror, Acquisition and the Company
hereby irrevocably waives all right to trial by jury in any action, proceeding
or counterclaim (whether based on contract, tort or otherwise) arising out of or
relating to this Agreement, the transactions contemplated hereby or the actions
of such parties in the negotiation, administration, performance and enforcement
hereof.

                                      A-43

<PAGE>   103


     IN WITNESS WHEREOF, each of the parties signed below has caused this
Agreement to be executed on its behalf by its officer thereunto duly authorized
the day and year first above written:

                                       MACTEC, INC.
                                       a Colorado corporation


                                       By: /s/ Scott E. State
                                           -------------------------------------
                                           Name:  Scott E. State
                                           Title: President

                                       CETCAM ACQUISITION CORPORATION,
                                       a Delaware corporation


                                       By: /s/ Scott E. State
                                           -------------------------------------
                                           Name:  Scott E. State
                                           Title: President

                                       HARDING LAWSON ASSOCIATES GROUP,
                                       INC., a Delaware corporation


                                       By: /s/ Robert L. Costello, Jr.
                                           -------------------------------------
                                           Name:  Robert L. Costello, Jr.
                                           Title: Chief Executive Officer

                                      A-44

<PAGE>   104


                                   APPENDIX B


                    [LETTERHEAD OF CIBC WORLD MARKETS CORP.]


                                 March 23, 2000


The Board of Directors
Harding Lawson Associates Group, Inc.
707 17th Street, Suite 2400
Denver, Colorado  80202

Members of the Board:

You have asked CIBC World Markets Corp. ("CIBC World Markets") to render a
written opinion ("Opinion") to the Board of Directors as to the fairness, from a
financial point of view, to the holders of the common stock of Harding Lawson
Associates Group, Inc. ("Harding") of the Merger Consideration (defined below)
to be received pursuant to the Agreement and Plan of Merger, dated as of March
23, 2000 (the "Merger Agreement"), by and among MACTEC, Inc. ("MACTEC"), CETCAM
Acquisition Corp., a wholly owned subsidiary of MACTEC ("Sub"), and Harding. The
Merger Agreement provides for, among other things, the merger of Sub with and
into Harding (the "Merger") pursuant to which each outstanding share of the
common stock, par value $0.01 per share, of Harding (the "Harding Common Stock")
will be converted into the right to receive $11.50 in cash (the "Merger
Consideration").

In arriving at our Opinion, we:

(a)      reviewed the Merger Agreement;

(b)      reviewed audited financial statements of Harding for the fiscal years
         ended May 31, 1997, May 31, 1998 and May 31, 1999;

(c)      reviewed unaudited financial statements of Harding for the fiscal
         quarters ended August 31, 1999 and November 30, 1999;

(d)      reviewed financial projections of Harding prepared by the management of
         Harding;

(e)      reviewed the historical market prices and trading volume for Harding
         Common Stock;

(f)      held discussions with the senior management of Harding with respect to
         the business and prospects for future growth of Harding;

(g)      reviewed and analyzed certain publicly available financial data for
         certain companies we deemed comparable to Harding;


                                      B-1

<PAGE>   105

The Board of Directors
Harding Lawson Associates Group, Inc.
707 17th Street, Suite 2400
Denver, Colorado  80202
Page 2


(h)      performed a discounted cash flow analysis of Harding using certain
         assumptions of future performance provided to or discussed with us by
         the management of Harding;

(i)      reviewed and analyzed certain publicly available information for
         transactions that we deemed comparable to the Merger;

(j)      reviewed public information concerning Harding;

(k)      at the request of Harding, approached and held discussions with certain
         third parties to solicit indications of interest in the possible
         acquisition of Harding; and

(l)      performed such other analyses, reviewed such other information and
         considered such other factors as we deemed appropriate.

In rendering our Opinion, we relied upon and assumed, without independent
verification or investigation, the accuracy and completeness of all of the
financial and other information provided to or discussed with us by Harding and
its employees, representatives and affiliates. With respect to forecasts of the
future financial condition and operating results of Harding provided to or
discussed with us, we assumed, at the direction of the management of Harding,
without independent verification or investigation, that such forecasts were
reasonably prepared on bases reflecting the best available information,
estimates and judgments of the management of Harding. We have neither made nor
obtained any independent evaluations or appraisals of the assets or the
liabilities (contingent or otherwise) of Harding or its affiliated entities. We
are not expressing any opinion as to the underlying valuation, future
performance or long-term viability of Harding, or the price at which Harding
Common Stock will trade subsequent to announcement or upon consummation of the
Merger. Our Opinion is necessarily based on the information available to us and
general economic, financial and stock market conditions and circumstances as
they exist and can be evaluated by us on the date hereof. It should be
understood that, although subsequent developments may affect this Opinion, we do
not have any obligation to update, revise or reaffirm the Opinion.

As part of our investment banking business, we are regularly engaged in
valuations of businesses and securities in connection with acquisitions and
mergers, underwritings, secondary distributions of securities, private
placements and valuations for other purposes.

We have acted as financial advisor to Harding in connection with the Merger and
to the Board of Directors of Harding in rendering this Opinion and will receive
a fee for our services, a significant portion of which is contingent upon
consummation of the Merger. We also will receive a fee upon the delivery of this
Opinion. In the ordinary course of business, CIBC World Markets and its
affiliates may actively trade securities of Harding for their own account and
for the accounts of customers and, accordingly, may at any time hold a long or
short position in such securities.


                                      B-2


<PAGE>   106

The Board of Directors
Harding Lawson Associates Group, Inc.
707 17th Street, Suite 2400
Denver, Colorado  80202
Page 3

Based upon and subject to the foregoing, it is our opinion that, as of the date
hereof, the Merger Consideration is fair from a financial point of view to the
holders of Harding Common Stock. This Opinion is for the use of the Board of
Directors of Harding in its evaluation of the Merger, and does not constitute a
recommendation to any stockholder as to how such stockholder should vote on any
matters relating to the Merger.

                                                Very truly yours,

                                                /s/ CIBC World Markets Corp.

                                                CIBC WORLD MARKETS CORP.



                                      B-3

<PAGE>   107


                                   APPENDIX C

                RIGHTS OF DISSENTING STOCKHOLDERS UNDER THE DGCL

         In view of the complexity of these provisions of the DGCL, any
stockholder who is considering exercising appraisal rights should consult his or
her legal advisor.

         The following is a summary of the principal provisions of Section 262
and does not purport to be complete description. A copy of Section 262 follows
this summary. THIS SUMMARY IS NOT INTENDED TO BE COMPLETE AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SECTION 262 OF THE DGCL, THE TEXT OF WHICH IS SET
FORTH IN THIS APPENDIX C HERETO.

         A stockholder electing to exercise appraisal rights must (a) deliver to
Harding, before the Harding stockholders vote on the merger agreement, a written
demand for appraisal that is made by or on behalf of the person who is the
holder of common stock for which appraisal is demanded (b) not vote in favor of
adopting the merger agreement. The demand must be delivered to Harding Lawson
Associates Group, Inc. at 707 Seventeenth Street, Suite 2400, Denver, CO 80202,
Attention: Secretary. A proxy or vote against adopting the merger agreement does
not constitute a demand. A stockholder electing to take such action must do so
by a separate written demand that reasonably informs Harding of the name and
mailing address of the holder of record and of such stockholder's intention to
demand appraisal of such holder's common stock. Because a proxy left blank will,
unless revoked, be voted FOR adoption and approval of the merger agreement, a
stockholder electing to exercise appraisal rights who votes by proxy must not
leave the proxy blank but must vote AGAINST adoption of the merger agreement or
ABSTAIN from voting for or against adoption of the merger agreement, in addition
to making a separate demand for appraisal. If the demand is not physically
received by Harding before the special meeting, irrespective of when mailed,
then the demand will not be considered mailed.

         Only the holder of record of common stock is entitled to demand
appraisal rights for common stock registered in that holder's name. The demand
must be executed by or for the holder of record, fully and correctly, as the
holder's name appears on the holder's stock certificates. If common stock is
owned of record in a fiduciary capacity, such as by a trustee, guardian or
custodian, the demand should be executed in that capacity. If common stock is
owned of record by more than one person, as in a joint tenancy or tenancy in
common, the demand should be executed by or for all owners. An authorized agent,
including one of two or more joint owners, may execute the demand for appraisal
for a holder of record; however, the agent must identify the owner or owners of
record and expressly disclose the fact that, in executing the demand, the agent
is acting as agent for the owner or owners of record. A holder of record, such
as a broker, who holds common stock as nominee for beneficial owners may
exercise a holder's right of appraisal with respect to common stock held for all
or less than all of such beneficial owners. In such case, the written demand
should set forth the number of shares of common stock covered by the demand.
Where no number of shares of common stock is expressly mentioned, the demand
will be presumed to cover all shares of common stock standing in the name of the
holder of record.


                                      C-1

<PAGE>   108

         Within 10 days after the effective time of the merger, Harding will
send notice of the effectiveness of the merger to each person who prior to the
effective time of the merger satisfied the foregoing conditions. Any stockholder
entitled to appraisal rights may, within 20 days after the date of the mailing
of the notice, demand in writing from Harding the appraisal of his or her
Harding shares.

         Within 120 days after the effective time of the merger, Harding or any
stockholder who has satisfied the foregoing conditions may file a petition in
the Delaware Court of Chancery demanding a determination of the fair value of
the common stock held by all stockholders entitled to appraisal. Harding does
not currently intend to file an appraisal petition and stockholders seeking to
exercise appraisal rights should not assume that Harding will file a petition to
appraise the value of their common stock or that Harding will initiate any
negotiations with respect to the "fair value" of such common stock. Accordingly,
holders of common stock should initiate all necessary action to perfect their
appraisal rights within the time periods prescribed in Section 262.

         Within 120 days after the effective time of the merger, any stockholder
who has complied with the requirements for exercise of appraisal rights, as
discussed above, is entitled, upon written request, to receive from Harding a
statement setting forth the aggregate number of shares of common stock not voted
in favor of the merger and with respect to which demands for appraisal have been
made and the aggregate number of holders of such common stock. Harding is
required to mail such statement within 10 days after it receives a written
request to do so, or within 10 days after expiration of the time for delivery of
demands for appraisal under Section 262, whichever is later.

         If a petition for an appraisal is timely filed and a copy is delivered
to Harding, Harding must then provide the Delaware Court of Chancery with a list
of the stockholders who have demanded appraisal rights. After notice to those
stockholders, the Court can conduct a hearing to determine the stockholders
entitled to appraisal rights. The Court may require stockholders who have
demanded payment for their shares to submit their stock certificates to the
Court for a notation thereon, and if any stockholder fails to comply with the
requirement, the Court may dismiss the proceedings as to such stockholder. At a
hearing on the petition, the Court will determine the stockholders entitled to
appraisal rights and will appraise the common stock owned by such stockholders,
determining its "fair value" exclusive of any element of value arising from the
accomplishment or expectation of the merger and will determine the amount of
interest, if any, to be paid upon the value of the common stock of the
stockholders entitled to appraisal. Any such judicial determination of the "fair
value" of common stock could be based upon considerations other than or in
addition to the price paid in the merger and the market value of common stock,
including asset values, the investment value of the common stock and any other
valuation considerations generally accepted in the investment community. The
value so determined for common stock could be more than, less than or the same
as the consideration paid pursuant to the merger agreement. The Court may also
order that all or a portion of any stockholder's expenses incurred in connection
with an appraisal proceeding, including, without limitation, reasonable
attorneys' fees and fees and expenses of experts utilized in the appraisal
proceeding, be charged pro rata against the value of all common stock entitled
to appraisal.


                                      C-2

<PAGE>   109

         Any stockholder who has duly demanded an appraisal in compliance with
Section 262 will not, after the effective time of the merger, be entitled to
vote the shares subject to such demand for any purpose or be entitled to
dividends or other distributions on that common stock (other than those payable
or deemed to be payable to stockholders of record as of a date prior to the
effective time of the merger).

         Holders of common stock lose the right to appraisal if no petition for
appraisal is filed within 120 days after the effective time of the merger, or if
a stockholder delivers to Harding a written withdrawal of such stockholder's
demand for an appraisal and an acceptance of the merger, except that any such
attempt to withdraw made more than 60 days after the effective time of the
merger requires Harding's written approval. If appraisal rights are not
perfected or a demand for appraisal rights is withdrawn, a stockholder will be
entitled to receive the consideration otherwise payable pursuant to the merger
agreement.

         If an appraisal proceeding is timely instituted, such proceeding may
not be dismissed without the approval of the Delaware Court of Chancery as to
any stockholder who has perfected a right of appraisal.

         Failure by the stockholder to take any required step to perfect
appraisal rights may result in termination of the appraisal rights. Because the
appraisal provisions of the Delaware General Corporation law are so complex,
stockholders who are considering exercising their appraisal rights under Section
262 should consult with their legal advisors.

APPRAISAL RIGHTS CANNOT BE EXERCISED AT THIS TIME. THE INFORMATION SET FORTH
ABOVE IS FOR INFORMATIONAL PURPOSES ONLY WITH RESPECT TO ALTERNATIVES AVAILABLE
TO STOCKHOLDERS IF THE MERGER IS CONSUMMATED. THIS PROXY STATEMENT CONSTITUTES
NOTICE TO HOLDERS OF HARDING COMMON STOCK THAT APPRAISAL RIGHTS ARE AVAILABLE TO
THEM. STOCKHOLDERS WHO SELL SHARES IN THE OFFER WILL NOT BE ENTITLED TO EXERCISE
APPRAISAL RIGHTS WITH RESPECT THERETO BUT, RATHER, WILL RECEIVE THE PRICE PAID
IN THE OFFER THEREFOR.

GENERAL CORPORATION LAW OF THE STATE OF DELAWARE

262. Appraisal Rights

(a) Any stockholder of a corporation of this State who holds shares of stock on
the date of the making of a demand pursuant to subsection (d) of this section
with respect to such shares, who continuously holds such shares through the
effective date of the merger or consolidation, who has otherwise complied with
subsection (d) of this section and who has neither voted in favor of the merger
or consolidation nor consented thereto in writing pursuant to Section 228 of
this title shall be entitled to an appraisal by the Court of Chancery of the
fair value of the stockholder's shares of stock under the circumstances
described in subsections (b) and (c) of this section. As used in this section,
the word "stockholder" means a holder of record of stock in a stock corporation
and also a member of record of a nonstock corporation; the words "stock" and
"share" mean and include what is ordinarily meant by those words and also
membership or membership interest of a member of a nonstock corporation; and the
words "depository receipt" mean a receipt or other instrument issued by a
depository representing an interest in one or more


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<PAGE>   110

shares, or fractions thereof, solely of stock of a corporation, which stock is
deposited with the depository.

(b) Appraisal rights shall be available for the shares of any class or series of
stock of a constituent corporation in a merger or consolidation to be effected
pursuant to Section 251 (other than a merger effected pursuant to Section 251(g)
of this title), Sections 252, 254, 257, 258, 263 or 264 of this title:

         (1) Provided, however, that no appraisal rights under this section
shall be available for the shares of any class or series of stock, which stock,
or depository receipts in respect thereof, at the record date fixed to determine
the stockholders entitled to receive notice of and to vote at the meeting of
stockholders to act upon the agreement of merger or consolidation, were either
(i) listed on a national securities exchange or designated as a national market
system security on an interdealer quotation system by the National Association
of Securities Dealers, Inc. or (ii) held of record by more than 2,000 holders;
and further provided that no appraisal rights shall be available for any shares
of stock of the constituent corporation surviving a merger if the merger did not
require for its approval the vote of the stockholders of the surviving
corporation as provided in subsection (f) of Section 251 of this title.

         (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
under this section shall be available for the shares of any class or series of
stock of a constituent corporation if the holders thereof are required by the
terms of an agreement of merger or consolidation pursuant to Sections 251, 252,
254, 257, 258, 263 and 264 of this title to accept for such stock anything
except:

                  a. Shares of stock of the corporation surviving or resulting
from such merger or consolidation, or depository receipts in respect thereof;

                  b. Shares of stock of any other corporation, or depository
receipts in respect thereof, which shares of stock (or depository receipts in
respect thereof) or depository receipts at the effective date of the merger or
consolidation will be either listed on a national securities exchange or
designated as a national market system security on an interdealer quotation
system by the National Association of Securities Dealers, Inc. or held of record
by more than 2,000 holders;

                  c. Cash in lieu of fractional shares or fractional depository
receipts described in the foregoing subparagraphs a. and b. of this paragraph;
or

                  d. Any combination of the shares of stock, depository receipts
and cash in lieu of fractional shares or fractional depository receipts
described in the foregoing subparagraphs a., b. and c. of this paragraph.

         (3) In the event all of the stock of a subsidiary Delaware corporation
party to a merger effected under Section 253 of this title is not owned by the
parent corporation immediately prior to the merger, appraisal rights shall be
available for the shares of the subsidiary Delaware corporation.


                                       C-4

<PAGE>   111

(c) Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets of
the corporation. If the certificate of incorporation contains such a provision,
the procedures of this section, including those set forth in subsections (d) and
(e) of this section, shall apply as nearly as is practicable.

(d) Appraisal rights shall be perfected as follows:

         (1) If a proposed merger or consolidation for which appraisal rights
are provided under this section is to be submitted for approval at a meeting of
stockholders, the corporation, not less than 20 days prior to the meeting, shall
notify each of its stockholders who was such on the record date for such meeting
with respect to shares for which appraisal rights are available pursuant to
subsections (b) or (c) hereof that appraisal rights are available for any or all
of the shares of the constituent corporations, and shall include in such notice
a copy of this section. Each stockholder electing to demand the appraisal of
such stockholder's shares shall deliver to the corporation, before the taking of
the vote on the merger or consolidation, a written demand for appraisal of such
stockholder's shares. Such demand will be sufficient if it reasonably informs
the corporation of the identity of the stockholder and that the stockholder
intends thereby to demand the appraisal of such stockholder's shares. A proxy or
vote against the merger or consolidation shall not constitute such a demand. A
stockholder electing to take such action must do so by a separate written demand
as herein provided. Within 10 days after the effective date of such merger or
consolidation, the surviving or resulting corporation shall notify each
stockholder of each constituent corporation who has complied with this
subsection and has not voted in favor of or consented to the merger or
consolidation of the date that the merger or consolidation has become effective;
or

         (2) If the merger or consolidation was approved pursuant to Section 228
or Section 253 of this title, each constituent corporation, either before the
effective date of the merger or consolidation or within ten days thereafter,
shall notify each of the holders of any class or series of stock of such
constituent corporation who are entitled to appraisal rights of the approval of
the merger or consolidation and that appraisal rights are available for any or
all shares of such class or series of stock of such constituent corporation, and
shall include in such notice a copy of this section; provided that, if the
notice is given on or after the effective date of the merger or consolidation,
such notice shall be given by the surviving or resulting corporation to all such
holders of any class or series of stock of a constituent corporation that are
entitled to appraisal rights. Such notice may, and, if given on or after the
effective date of the merger or consolidation, shall, also notify such
stockholders of the effective date of the merger or consolidation. Any
stockholder entitled to appraisal rights may, within 20 days after the date of
mailing of such notice, demand in writing from the surviving or resulting
corporation the appraisal of such holder's shares. Such demand will be
sufficient if it reasonably informs the corporation of the identity of the
stockholder and that the stockholder intends thereby to demand the appraisal of
such holder's shares. If such notice did not notify stockholders of the
effective date of the merger or consolidation, either (i) each such constituent
corporation shall send a


                                      C-5

<PAGE>   112

second notice before the effective date of the merger or consolidation notifying
each of the holders of any class or series of stock of such constituent
corporation that are entitled to appraisal rights of the effective date of the
merger or consolidation or (ii) the surviving or resulting corporation shall
send such a second notice to all such holders on or within 10 days after such
effective date; provided, however, that if such second notice is sent more than
20 days following the sending of the first notice, such second notice need only
be sent to each stockholder who is entitled to appraisal rights and who has
demanded appraisal of such holder's shares in accordance with this subsection.
An affidavit of the secretary or assistant secretary or of the transfer agent of
the corporation that is required to give either notice that such notice has been
given shall, in the absence of fraud, be prima facie evidence of the facts
stated therein. For purposes of determining the stockholders entitled to receive
either notice, each constituent corporation may fix, in advance, a record date
that shall be not more than 10 days prior to the date the notice is given,
provided, that if the notice is given on or after the effective date of the
merger or consolidation, the record date shall be such effective date. If no
record date is fixed and the notice is given prior to the effective date, the
record date shall be the close of business on the day next preceding the day on
which the notice is given.

(e) Within 120 days after the effective date of the merger or consolidation, the
surviving or resulting corporation or any stockholder who has complied with
subsections (a) and (d) hereof and who is otherwise entitled to appraisal
rights, may file a petition in the Court of Chancery demanding a determination
of the value of the stock of all such stockholders. Notwithstanding the
foregoing, at any time within 60 days after the effective date of the merger or
consolidation, any stockholder shall have the right to withdraw his demand for
appraisal and to accept the terms offered upon the merger or consolidation.
Within 120 days after the effective date of the merger or consolidation, any
stockholder who has complied with the requirements of subsections (a) and (d)
hereof, upon written request, shall be entitled to receive from the corporation
surviving the merger or resulting from the consolidation a statement setting
forth the aggregate number of shares not voted in favor of the merger or
consolidation and with respect to which demands for appraisal have been received
and the aggregate number of holders of such shares. Such written statement shall
be mailed to the stockholder within 10 days after his written request for such a
statement is received by the surviving or resulting corporation or within 10
days after expiration of the period for delivery of demands for appraisal under
subsection (d) hereof, whichever is later.

(f) Upon the filing of any such petition by a stockholder, service of a copy
thereof shall be made upon the surviving or resulting corporation, which shall
within 20 days after such service file in the office of the Register in Chancery
in which the petition was filed a duly verified list containing the names and
addresses of all stockholders who have demanded payment for their shares and
with whom agreements as to the value of their shares have not been reached by
the surviving or resulting corporation. If the petition shall be filed by the
surviving or resulting corporation, the petition shall be accompanied by such a
duly verified list. The Register in Chancery, if so ordered by the Court, shall
give notice of the time and place fixed for the hearing of such petition by
registered or certified mail to the surviving or resulting corporation and to
the stockholders shown on the list at the addresses therein stated. Such notice
shall also be given by one or more publications at least one week before the day
of the hearing, in a newspaper of general circulation published in the City of
Wilmington, Delaware or such publication as the


                                      C-6

<PAGE>   113

Court deems advisable. The forms and other notices by mail and by publication
shall be approved by the Court, and the costs thereof shall be borne by the
surviving or resulting corporation.

(g) At the hearing on such petition, the Court shall determine the stockholders
who have complied with this section and who have become entitled to appraisal
rights. The Court may require the stockholders who have demanded an appraisal
for their shares and who hold stock represented by certificates to submit their
certificates of stock to the Register in Chancery for notation thereon of the
pendency of the appraisal proceedings; and if any stockholder fails to comply
with such direction, the Court may dismiss the proceedings as to such
stockholder.

(h) After determining the stockholders entitled to an appraisal, the Court shall
appraise the shares, determining their fair value exclusive of any element of
value arising from the accomplishment or expectation of the merger or
consolidation, together with a fair rate of interest, if any, to be paid upon
the amount determined to be the fair value. In determining such fair value, the
Court shall take into account all relevant factors. In determining the fair rate
of interest, the Court may consider all relevant factors, including the rate of
interest which the surviving or resulting corporation would have had to pay to
borrow money during the pendency of the proceeding. Upon application by the
surviving or resulting corporation or by any stockholder entitled to participate
in the appraisal proceeding, the Court may, in its discretion, permit discovery
or other pretrial proceedings and may proceed to trial upon the appraisal prior
to the final determination of the stockholder entitled to an appraisal. Any
stockholder whose name appears on the list filed by the surviving or resulting
corporation pursuant to subsection (f) of this section and who has submitted
such stockholder's certificates of stock to the Register in Chancery, if such is
required, may participate fully in all proceedings until it is finally
determined that such stockholder is not entitled to appraisal rights under this
section.

(i) The Court shall direct the payment of the fair value of the shares, together
with interest, if any, by the surviving or resulting corporation to the
stockholders entitled thereto. Interest may be simple or compound, as the Court
may direct. Payment shall be so made to each such stockholder, in the case of
holders of uncertificated stock forthwith, and the case of holders of shares
represented by certificates upon the surrender to the corporation of the
certificates representing such stock. The Court's decree may be enforced as
other decrees in the Court of Chancery may be enforced, whether such surviving
or resulting corporation be a corporation of this State or of any state.

(j) The costs of the proceeding may be determined by the Court and taxed upon
the parties as the Court deems equitable in the circumstances. Upon application
of a stockholder, the Court may order all or a portion of the expenses incurred
by any stockholder in connection with the appraisal proceeding, including,
without limitation, reasonable attorney's fees and the fees and expenses of
experts, to be charged pro rata against the value of all the shares entitled to
an appraisal.

(k) From and after the effective date of the merger or consolidation, no
stockholder who has demanded his appraisal rights as provided in subsection (d)
of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other distributions on the


                                      C-7

<PAGE>   114

stock (except dividends or other distributions payable to stockholders of record
at a date which is prior to the effective date of the merger or consolidation);
provided, however, that if no petition for an appraisal shall be filed within
the time provided in subsection (e) of this section, or if such stockholder
shall deliver to the surviving or resulting corporation a written withdrawal of
his demand for an appraisal and an acceptance of the merger or consolidation,
either within 60 days after the effective date of the merger or consolidation as
provided in subsection (e) of this section or thereafter with the written
approval of the corporation, then the right of such stockholder to an appraisal
shall cease. Notwithstanding the foregoing, no appraisal proceeding in the Court
of Chancery shall be dismissed as to any stockholder without the approval of the
Court, and such approval may be conditioned upon such terms as the Court deems
just.

  (l) The shares of the surviving or resulting corporation to which the shares
of such objecting stockholders would have been converted had they assented to
the merger or consolidation shall have the status of authorized and unissued
shares of the surviving or resulting corporation.




                                      C-8

<PAGE>   115


                                     ANNEX A

      PROXY FOR THE SPECIAL MEETING OF STOCKHOLDERS TO BE HELD MAY 25, 2000

                      HARDING LAWSON ASSOCIATES GROUP, INC.

           THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned holder of common stock acknowledges receipt of a copy of the
Notice of Special Meeting of Stockholders of Harding Lawson Associates Group,
Inc., a Delaware corporation (the "Company"), and the accompanying Proxy
Statement dated April __, 2000, and revoking any proxy heretofore given, hereby
constitutes and appoints Richard D. Puntillo, Chairman of the Board and Robert
L. Costello, Jr., Chief Executive Officer and each of them, with full power of
substitution, as attorneys and proxies to appear and vote all of the shares of
common stock of Harding Lawson Associates Group, Inc., standing in the name of
the undersigned which the undersigned could vote if personally present and
acting at the Special Meeting of the Stockholders of Harding Lawson Associates
Group, Inc. to be held at 707 Seventeenth Street, Suite 2400, Denver, Colorado,
on May 25, 2000 at 9:00 a.m. local time, upon the following item as set forth in
the Notice of Special Meeting and Proxy Statement, and according to their
discretion, upon all other matters that may be properly presented for action at
the meeting or any adjournments or postponements thereof. The undersigned may
revoke this proxy at any time prior to its exercise.



- -----------                                                        ------------
SEE REVERSE                                                        SEE REVERSE
   SIDE            CONTINUED AND TO BE SIGNED ON REVERSE SIDE         SIDE
- -----------                                                        -----------


<PAGE>   116


[x]    Please mark votes
       as in this example

THE PROXY WHEN PROPERLY EXECUTED AND RETURNED TO THE COMPANY WILL BE VOTED AS
DIRECTED OR, IF NO DIRECTION IS INDICATED IT WILL BE VOTED "FOR" THE PROPOSAL
LISTED ON THIS CARD.



Approval and adoption of the Agreement and      FOR       AGAINST     ABSTAIN
Plan of Merger, dated as of March 23, 2000,     [ ]         [ ]          [ ]
among MACTEC, Inc., CETCAM Acquisition
Corporation and Harding Lawson Associates
Group, Inc.

                           MARK HERE IF YOU PLAN TO ATTEND THE MEETING     [ ]

                           MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT   [ ]


                           Please sign exactly as your name(s) appear(s). If
                           shares are registered in more than one name, all
                           owners should sign. When signing as attorney,
                           executor, administrator, trustee, officer, partner,
                           or guardian, please give full title. If more than one
                           trustee, all should sign. WHETHER OR NOT YOU PLAN TO
                           ATTEND THE ANNUAL MEETING, PLEASE SIGN AND RETURN
                           THIS PROXY AS PROMPTLY AS POSSIBLE IN THE ENCLOSED
                           POST-PAID ENVELOPE.



Signature:                            Date:
          ---------------------------      ------------------

Signature:                            Date:
          ---------------------------      ------------------






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