NALCO CHEMICAL CO
SC 14D1, 1999-07-01
MISCELLANEOUS CHEMICAL PRODUCTS
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<PAGE>

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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                               ----------------
                                SCHEDULE 14D-1
                            Tender Offer Statement
      Pursuant to Section 14(d)(1) of the Securities Exchange Act of 1934

                            NALCO CHEMICAL COMPANY
                           (Name of Subject Company)

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

                            SUEZ LYONNAISE DES EAUX
                              H2O ACQUISITION CO.

                                   (Bidders)

                               ----------------
 Common Stock, par value $0.1875 per share (including the Associated Preferred
                            Stock Purchase Rights)
     Series B ESOP Convertible Preferred Stock, par value $1.00 per share
                        (Title of Class of Securities)

                               ----------------
        Common Stock: 629853102            Series B ESOP Convertible Preferred
                                                         Stock:
                                                          None

                     (CUSIP Number of Class of Securities)

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

                                Patrice Herbet
                            Suez Lyonnaise des Eaux
                                1, rue d'Astorg
                                  75008 Paris
                                    France
                             011-33-1-40-06-64-00

  (Name, Address and Telephone Number of Person Authorized to Receive Notices
                   and Communications on Behalf of Bidders)

                               ----------------
                                   Copy to:

                                  Kevin Keogh
                               White & Case LLP
                          1155 Avenue of the Americas
                           New York, New York 10036
                                (212) 819-8200

                           CALCULATION OF FILING FEE
<TABLE>
- ------------------------------------------------------
- ------------------------------------------------------
<CAPTION>
         Transaction Valuation* Amount of Filing Fee**
- ------------------------------------------------------
         <C>                    <S>
           $4,091,040,111.37          $818,208.02
- ------------------------------------------------------
- ------------------------------------------------------
</TABLE>

*  Estimated solely for the purpose of determining the registration fee. Based
   on the offer to purchase 77,189,936 shares of Common Stock (including
   10,888,271 exercisable options with a weighted average strike price of
   $34.27) and 353,908.409 shares of Series B ESOP Convertible Preferred
   Stock, at a price of (i) $53.00 per share of Common Share and (ii)
   $1,060.00 per share of Series B ESOP Convertible Preferred Stock, net to
   the seller in cash, without interest thereon.

** The amount of the filing fee, calculated in accordance with Rule 0-11 under
   the Securities Exchange Act of 1934, as amended, equals 1/50 of one percent
   of the aggregate of the cash offered by the bidder.

[_]Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
   and identify the filing with which the offsetting fee was previously paid.
   Identify the previous filing by registration statement number, or the Form
   or Schedule and the date of its filing.

Amount Previously Paid:________________   Filing Party:________________________
Form or Registration No.:______________   Date Filed:__________________________

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

                                SCHEDULE 14D-1

Item 1. Security and Subject Company.

  (a) This statement relates to the securities of Nalco Chemical Company, a
Delaware corporation (the "Company"). The principal executive offices of the
Company are located at One Nalco Center, Naperville, Illinois 60563-1198.

  (b) This statement relates to (i) the shares of common stock, par value
$0.1875 per share, of the Company, including the associated preferred stock
purchase rights (the "Common Stock") and (ii) the shares of Series B ESOP
Convertible Preferred Stock, par value $1.00 per share, of the Company (the
"ESOP Preferred Stock"). The Common Stock and the ESOP Preferred Stock are
referred to herein collectively as the "Shares." The information regarding the
number of each class of Shares outstanding, the exact amount of each class of
Shares being sought and the consideration being offered therefor is set forth
in the Introduction to the Offer to Purchase, dated July 1, 1999 (the "Offer
to Purchase"), and is incorporated herein by reference.

  (c) The information concerning the principal markets in which the Common
Stock are traded and the sales prices for the Common Stock for each quarterly
period during the past two years is set forth in the Offer to Purchase under
Section 6 ("Price Range; Dividends") and is incorporated herein by reference.

Item 2. Identity and Background.

  (a)-(d),(g) H2O Acquisition Co., a Delaware corporation ("Purchaser"), is a
wholly owned subsidiary of Suez Lyonnaise des Eaux, a societe anonyme
organized and existing under the laws of the Republic of France ("Parent").
The information set forth in the Offer to Purchase under Section 8 ("Certain
Information Concerning Purchaser and Parent") is incorporated herein by
reference. The name, business address, present principal occupation or
employment and material occupations, positions, offices or employment during
the last five years and citizenship of the directors and executive officers of
Purchaser and Parent are set forth in Schedule I to the Offer to Purchase and
are incorporated herein by reference.

  (e), (f) During the last five years, none of Purchaser or Parent, or, to the
best of their knowledge, any of the persons listed in Schedule I to the Offer
to Purchase has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors) or was a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction as a result of which
any such person was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting activities subject to, federal
or state securities laws or finding any violation of such law.

Item 3. Past Contacts, Transactions or Negotiations with the Subject Company.

  (a)-(b) The information set forth in the Offer to Purchase under the
Introduction, Section 10 ("Background of the Offer") and Section 11 ("Purpose
of the Offer; Plans for the Company; Certain Agreements") is incorporated
herein by reference.

Item 4.  Source and Amount of Funds or Other Consideration.

  (a)-(c) The information set forth in the Offer to Purchase under Section 9
("Source and Amount of Funds") is incorporated herein by reference.

Item 5. Purpose of the Tender Offer and Plans or Proposals of the Bidders.

  (a)-(g) The information set forth in the Offer to Purchase under the
Introduction, Section 11 ("Purpose of the Offer; Plans for the Company;
Certain Agreements") and Section 13 ("Effect of the Offer on the Market for
the Common Stock; Exchange Act Registration") is incorporated herein by
reference.


                                       2
<PAGE>

Item 6. Interest in Securities of the Subject Company.

  (a)-(b) The information set forth in the Offer to Purchase under the
Introduction, Section 8 ("Certain Information Concerning Purchaser and
Parent"), Section 10 ("Background of the Offer") and Schedule I is
incorporated herein by reference.

Item 7. Contracts, Arrangements, Understandings or Relationships with Respect
       to the Subject Company's Securities.

  The information set forth in the Offer to Purchase under the Introduction,
Section 10 ("Background of the Offer"), Section 11 ("Purpose of the Offer;
Plans for the Company; Certain Agreements") and Section 15 ("Certain Legal
Matters; Regulatory Approvals") is incorporated herein by reference.

Item 8. Persons Retained, Employed or to be Compensated.

  The information set forth in the Offer to Purchase under Section 16 ("Fees
and Expenses") is incorporated by reference.

Item 9. Financial Statements of Certain Bidders.

  Not applicable.

Item 10. Additional Information.

  (a) The information set forth in the Offer to Purchase under Section 11
("Purpose of the Offer; Plans for the Company; Certain Agreements") is
incorporated herein by reference.

  (b)-(c) The information set forth in the Offer to Purchase under Section 15
("Certain Legal Matters; Regulatory Approvals") is incorporated herein by
reference.

  (d) The information set forth in the Offer to Purchase under Section 13
("Effect of the Offer on the Market for the Common Stock; Exchange Act
Registration") is incorporated herein by reference.

  (e) Not applicable.

  (f) The information set forth in the entire text of each of (i) the Offer to
Purchase, (ii) the Letter of Transmittal to Tender Shares of Common Stock
and/or Series B ESOP Convertible Preferred Stock and (iii) the Agreement and
Plan of Merger, dated as of June 27, 1999, among Parent, Purchaser and the
Company, copies of which are attached hereto as Exhibits (a)(1), (a)(2) and
(c)(1) respectively, is incorporated herein by reference.

                                       3
<PAGE>

Item 11. Material to be Filed as Exhibits.

<TABLE>
<CAPTION>
  Exhibit No.                             Description
  -----------                             -----------
 <C>            <S>
 Exhibit (a)(1) Offer to Purchase.
 Exhibit (a)(2) Letter of Transmittal to Tender Shares of Common Stock and/or
                Series B ESOP Convertible Preferred Stock.
 Exhibit (a)(3) Form of letter to brokers, dealers, commercial banks, trust
                companies and other nominees.
 Exhibit (a)(4) Form of letter to be used by brokers, dealers, commercial
                banks, trust companies and nominees to their clients.
 Exhibit (a)(5) Press Release, dated June 28, 1999, announcing the tender
                offer.
 Exhibit (a)(6) Form of newspaper advertisement, dated July 1, 1999, published
                in The Wall Street Journal.
 Exhibit (a)(7) Notice of Guaranteed Delivery.
 Exhibit (a)(8) Guidelines for Substitute Form W-9.
 Exhibit (c)(1) The Agreement and Plan of Merger dated as of June 27, 1999
                among Suez Lyonnaise des Eaux, H2O Acquisition Co. and Nalco
                Chemical Company.
 Exhibit (c)(2) Confidentiality Agreement dated April 13, 1999 between
                Degremont, a wholly owned subsidiary of Suez Lyonnaise des
                Eaux, and Goldman, Sachs & Co., on behalf of Nalco Chemical
                Company.
 Exhibit (c)(3) Form of Agreement as to Terms of Employment.
</TABLE>

                                       4
<PAGE>

                                   SIGNATURE

  After due inquiry and to the best of my knowledge and belief, I certify that
the information set forth in this statement is true, complete and correct.

                                          Suez Lyonnaise des Eaux

                                                  /s/ Philippe Brongniart
Dated: July 1, 1999                       By:__________________________________
                                          Name: Philippe Brongniart
                                          Title: Member of the Executive Board


                                          H2O Acquisition Co.

Dated: July 1, 1999                               /s/ Philippe Brongniart
                                          By:__________________________________
                                          Name: Philippe Brongniart
                                          Title: Director

                                       5

<PAGE>

                                                                  Exhibit (a)(1)

                          OFFER TO PURCHASE FOR CASH

                 All of the Outstanding Shares of Common Stock
          (Including the Associated Preferred Stock Purchase Rights)
                                      and
  All of the Outstanding Shares of Series B ESOP Convertible Preferred Stock
                                      of
                            NALCO CHEMICAL COMPANY
                                      at
                     $53.00 Net Per Share of Common Stock
                                      and
     $1,060.00 Net Per Share of Series B ESOP Convertible Preferred Stock
                                      by
                              H2O ACQUISITION CO.
                         A Wholly Owned Subsidiary of
                            SUEZ LYONNAISE DES EAUX

 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON FRIDAY, JULY 30, 1999, UNLESS THE OFFER IS EXTENDED.


  THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (I) THERE BEING VALIDLY
TENDERED AND NOT PROPERLY WITHDRAWN PRIOR TO THE EXPIRATION OF THE OFFER A
NUMBER OF SHARES OF COMMON STOCK, PAR VALUE $0.1875 PER SHARE (THE "COMMON
STOCK"), AND SHARES OF SERIES B ESOP CONVERTIBLE PREFERRED STOCK (THE "ESOP
PREFERRED STOCK", AND, TOGETHER WITH THE COMMON STOCK, THE "SHARES") OF NALCO
CHEMICAL COMPANY WHICH, WHEN ADDED TO ANY SHARES OF COMMON STOCK ALREADY OWNED
BY SUEZ LYONNAISE DES EAUX OR H2O ACQUISITION CO., REPRESENTS AT LEAST A
MAJORITY OF ALL THE ISSUED AND OUTSTANDING SHARES OF COMMON STOCK, ON A FULLY
DILUTED BASIS, (II) THE EXPIRATION OR TERMINATION OF ANY APPLICABLE WAITING
PERIOD (AND ANY EXTENSION THEREOF) UNDER THE HART-SCOTT-RODINO ANTITRUST
IMPROVEMENTS ACT OF 1976, AS AMENDED, AND (III) IF REQUIRED BY APPLICABLE LAW,
THE RECEIPT PRIOR TO THE EXPIRATION OF THE OFFER OF A DECISION OF THE
COMMISSION OF THE EUROPEAN COMMUNITY THAT THE PURCHASE OF THE SHARES PURSUANT
TO THE OFFER AND THE MERGER (AS DEFINED HEREIN) ARE COMPATIBLE WITH THE COMMON
MARKET. THE OFFER IS ALSO CONDITIONED UPON THE SATISFACTION OF CERTAIN OTHER
TERMS AND CONDITIONS DESCRIBED IN SECTION 14--"CONDITIONS OF THE OFFER".

  THE OFFER IS BEING MADE PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED
AS OF JUNE 27, 1999 (THE "MERGER AGREEMENT"), AMONG SUEZ LYONNAISE DES EAUX,
H2O ACQUISITION CO. AND THE COMPANY. SEE SECTION 11--"PURPOSE OF THE OFFER;
PLANS FOR NALCO CHEMICAL COMPANY; CERTAIN AGREEMENTS".

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

                     The Dealer Manager for the Offer is:
                               J.P. Morgan & Co.

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

              The date of this Offer to Purchase is July 1, 1999.
<PAGE>

  ON JUNE 27, 1999 THE BOARD OF DIRECTORS OF THE COMPANY UNANIMOUSLY
(I) DETERMINED THAT THE MERGER IS ADVISABLE AND THAT THE MERGER AGREEMENT (AS
DEFINED HEREIN) AND THE TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE OFFER
AND THE MERGER, ARE FAIR TO AND IN THE BEST INTERESTS OF THE HOLDERS OF
SHARES, (II) APPROVED AND ADOPTED THE MERGER AGREEMENT AND THE TRANSACTIONS
CONTEMPLATED THEREBY, (III) RECOMMENDED THAT THE STOCKHOLDERS OF THE COMPANY
ACCEPT THE OFFER, APPROVE THE MERGER, AND APPROVE AND ADOPT THE MERGER
AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY, AND (IV) APPROVED THE
TAKING OF ALL OTHER APPLICABLE ACTION NECESSARY TO RENDER SECTION 203 OF THE
DGCL (AS DEFINED HEREIN) AND OTHER STATE TAKEOVER STATUTES AND THE RIGHTS
AGREEMENT (AS DEFINED HEREIN) INAPPLICABLE TO THE OFFER AND THE MERGER.

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

                                   IMPORTANT

  Any holder of Shares (a "Holder") desiring to tender all or any portion of
the Shares owned by such Holder should either (i) complete and sign the Letter
of Transmittal or a copy thereof in accordance with the instructions in such
Letter of Transmittal and mail or deliver it, together with the certificate(s)
evidencing tendered Shares, and any other required documents, to the
Depositary, (ii) where applicable, cause such Holder's broker, dealer,
commercial bank, trust company or custodian to tender such Shares pursuant to
the procedures for book-entry transfer of Shares or (iii) comply with the
guaranteed delivery procedures, in each case, upon the terms set forth in
Section 3--"Procedures for Tendering Shares". Any Holder whose Shares are
registered in the name of a broker, dealer, commercial bank, trust company or
other nominee must contact such broker, dealer, commercial bank, trust company
or custodian if such Holder desires to tender such Shares. See Section 3--
"Procedures for Tendering Shares".

  Any Holder who desires to tender Shares and whose certificate(s) evidencing
such Shares are not immediately available, or who cannot comply with the
procedures for book-entry transfer described in this Offer to Purchase on a
timely basis, may tender such Shares by following the procedures for
guaranteed delivery set forth in Section 3--"Procedures for Tendering Shares".

  Questions and requests for assistance may be directed to the Information
Agent or the Dealer Manager at their respective addresses and telephone
numbers set forth on the back cover of this Offer to Purchase. Additional
copies of this Offer to Purchase, the Letter of Transmittal or other related
tender offer materials may be obtained from the Information Agent or from
brokers, dealers, commercial banks or trust companies.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<S>                                                                        <C>
INTRODUCTION..............................................................   1
 1. Terms of the Offer....................................................   2
 2. Acceptance for Payment and Payment for Shares.........................   4
 3. Procedures for Tendering Shares.......................................   6
 4. Withdrawal Rights.....................................................   8
 5. Certain United States Federal Income Tax Consequences.................   9
 6. Price Range; Dividends................................................   9
 7. Certain Information Concerning the Company............................  11
 8. Certain Information Concerning Purchaser and Parent...................  14
 9. Source and Amount of Funds............................................  15
10. Background of the Offer...............................................  15
11. Purpose of the Offer; Plans for the Company; Certain Agreements.......  16
12. Dividends and Distributions...........................................  35
13. Effect of the Offer on the Market for the Common Stock; Exchange Act
 Registration.............................................................  35
14. Conditions of the Offer...............................................  36
15. Certain Legal Matters; Regulatory Approvals...........................  37
16. Fees and Expenses.....................................................  41
17. Miscellaneous.........................................................  41
</TABLE>

SCHEDULE I  Information Concerning the Directors and Executive Officers of Suez
            Lyonnaise des Eaux and H2O Acquisition Co.
<PAGE>

To the Holders of Common Stock and
  Series B ESOP Convertible Preferred Stock
  of Nalco Chemical Company:

                                 INTRODUCTION

  H2O Acquisition Co., a Delaware corporation ("Purchaser") and a wholly owned
subsidiary of Suez Lyonnaise des Eaux, a societe anonyme organized and
existing under the laws of the Republic of France ("Parent"), hereby offers to
purchase (i) all of the issued and outstanding shares of common stock, par
value $0.1875 per share (the "Common Stock"), of Nalco Chemical Company, a
Delaware corporation (the "Company"), at a price of $53.00 per share of Common
Stock, net to the seller in cash, without interest thereon (the "Common Stock
Offer Price"), and (ii) all of the issued and outstanding shares of Series B
ESOP Convertible Preferred Stock (the "ESOP Preferred Stock") of the Company,
at a price of $1,060.00 per share of ESOP Preferred Stock, net to the seller
in cash, without interest thereon (the "ESOP Preferred Stock Offer Price",
and, together with the Common Stock Offer Price, the "Offer Price"), upon the
terms and subject to the conditions set forth in this Offer to Purchase and in
the related Letter of Transmittal (which, as they may be amended and
supplemented from time to time, together constitute the "Offer"). Unless the
context indicates otherwise, as used herein, "Shares" shall mean the shares of
Common Stock and the shares of ESOP Preferred Stock. Unless the context
indicates otherwise, all references to Common Stock shall include the
associated preferred stock purchase rights (the "Rights") issued pursuant to
the Rights Agreement, dated as of June 20, 1996 (the "Rights Agreement"), by
and between the Company and First Chicago Trust Company of New York ("First
Chicago") as Rights Agent.

  Holders of Shares ("Holders") whose Shares are registered in their own name
and who tender directly to First Chicago, as Depositary (the "Depositary")
will not be obligated to pay brokerage fees or commissions or, except as set
forth in Instruction 6 of the Letter of Transmittal, stock transfer taxes on
the purchase of Shares pursuant to the Offer. Purchaser will pay all charges
and expenses of J.P. Morgan Securities Inc., as Dealer Manager (the "Dealer
Manager" or "J.P. Morgan"), the Depositary and Morrow & Co., Inc., as
Information Agent (the "Information Agent"), in each case incurred in
connection with the Offer. See Section 16--"Fees and Expenses".

  The Offer is conditioned upon, among other things, (i) there being validly
tendered and not withdrawn prior to the expiration of the Offer at least such
number of Shares which, when added to any shares of Common Stock already owned
by Parent, constitute a majority of the then outstanding shares of Common
Stock on a fully diluted basis (including, without limitation, all shares of
Common Stock issuable upon the conversion of the ESOP Preferred Stock or any
other convertible securities or upon the exercise of any options, warrants or
rights) (the "Minimum Condition"), (ii) the satisfaction of the HSR Condition
(as defined herein), and (iii) the satisfaction of the EC Condition (as
defined herein). The Offer is also conditioned upon the satisfaction of
certain other terms and conditions described in Section 14--"Conditions of the
Offer".

  The board of directors of the Company (the "Board of Directors") has duly
adopted resolutions that (i) determined that the Merger (as defined herein) is
advisable and that the Merger Agreement (as defined herein) and the
transactions contemplated thereby, including the Offer and the Merger, are
fair to and in the best interests of the Holders, (ii) approved and adopted
the Merger Agreement and the transactions contemplated thereby, (iii)
recommended the acceptance of the Offer, the approval of the Merger and the
approval and adoption of the Merger Agreement by the stockholders of the
Company, and (iv) approved the taking of all other applicable action necessary
to render Section 203 of the Delaware General Corporations Law (the "DGCL")
and other state takeover statutes and the Rights Agreement inapplicable to the
Offer and the Merger.

  The Company has advised Parent that Goldman, Sachs & Co. ("Goldman Sachs"),
the financial advisor to the Company, has delivered to the Board of Directors
its written opinion dated June 28, 1999, to the effect that as of such date,
the Common Stock Offer Price to be received by the holders of Common
<PAGE>

Stock pursuant to the Offer and the Merger is fair to such holders of Common
Stock from a financial point of view. A copy of the opinion of Goldman Sachs,
which sets forth the assumptions and qualifications made, factors considered
and scope of review undertaken by Goldman Sachs, is contained in the Company's
Solicitation/Recommendation Statement on Schedule 14D-9 (the "Schedule 14D-
9"), which is being mailed to the Holders concurrently herewith. Holders are
urged to read the full text of that opinion.

  The Offer is being made pursuant to the Agreement and Plan of Merger, dated
as of June 27, 1999 (the "Merger Agreement"), among Parent, Purchaser and the
Company. The Merger Agreement provides that, as promptly as practicable after
consummation of the Offer, Purchaser will be merged with and into the Company
(the "Merger"). At the effective time of the Merger (the "Effective Time"),
except for (a) Shares which are held by any subsidiary of the Company or in
the treasury of the Company, or which are held, directly or indirectly, by
Parent or any direct or indirect subsidiary of Parent (including Purchaser),
all of which shall cease to be outstanding, and shall be canceled and retired
and none of which shall receive any payment with respect thereto and (b)
Shares held by holders exercising their rights to dissent in accordance with
Delaware law, (i) each share of Common Stock (including all Rights) issued and
outstanding immediately prior to the Effective Time shall, by virtue of the
Merger and without any action on the part of the holder thereof, forthwith be
canceled and shall be converted automatically into the right to receive an
amount in cash equal to $53.00, without interest; and (ii) each share of ESOP
Preferred Stock issued and outstanding immediately prior to the Effective Time
shall be canceled and shall be converted automatically into the right to
receive an amount in cash equal to $1,060.00, without interest. The Merger
Agreement is more fully described in Section 11--"Purpose of the Offer; Plans
for the Company; Certain Agreements".

  The Company has informed Purchaser that, as of June 24, 1999, there were (x)
66,263,894 shares of Common Stock issued and outstanding, (y) stock options
issued under the Company's Stock Option Plans (as defined herein) covering not
more than 10,888,271 shares of Common Stock (with an exercise price less than
$53.00), and (z) 353,908.409 shares of ESOP Preferred Stock issued and
outstanding. As a result, as of such date, the Minimum Condition would be
satisfied if at least 42,115,167 shares of Common Stock are validly tendered
and not properly withdrawn prior to the Expiration Date (as defined herein).
The Company has advised Parent that each of its directors and executive
officers intends to tender pursuant to the Offer all Shares owned of record
and beneficially by him or her, except to the extent that such tender would
violate applicable securities laws.

  "HSR Condition" means the expiration or termination of any applicable
waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended (the "HSR Act"), (and any extension thereof) . "EC Condition" shall
mean, if required by applicable law, the receipt prior to the Expiration Date
of a decision of the Commission of the European Community that the purchase of
the Common Stock pursuant to the Offer and the Merger are compatible with the
Common Market. "Regulatory Condition" shall mean the HSR Condition and the EC
Condition, collectively. See Section 14--"Conditions of the Offer" for a
complete description of the conditions of the Offer.

  This Offer to Purchase and the Letter of Transmittal contain important
information which should be read carefully before any decision is made with
respect to the Offer.

                               THE TENDER OFFER

  1. Terms of the Offer. Upon the terms and subject to the conditions of the
Offer (including, if the Offer is extended or amended, the terms and
conditions of any extension or amendment), Purchaser will accept for payment
and pay for all Shares validly tendered prior to the Expiration Date and not
withdrawn in accordance with Section 4--"Withdrawal Rights". The term
"Expiration Date" means 12:00 Midnight, New York City time, on Friday, July
30, 1999, unless and until Purchaser, in its sole discretion (but subject to
the terms of the Merger Agreement), shall have extended the period of time
during which the Offer is open, in which event the term "Expiration Date"
shall mean the latest time and date at which the Offer, as so extended by
Purchaser, shall expire.

                                       2
<PAGE>

  The Offer is conditioned upon, among other things, satisfaction of (i) the
Minimum Condition, (ii) the HSR Condition, and (iii) the EC Condition. The
Offer is also subject to certain other conditions set forth in Section 14--
"Conditions of the Offer". If these or any of the other conditions referred to
in Section 14--"Conditions of the Offer" are not satisfied or any of the
events specified in Section 14--"Conditions of the Offer" have occurred or are
determined by Purchaser to have occurred prior to the Expiration Date,
Purchaser, subject to the terms of the Merger Agreement, expressly reserves
the right (but is not obligated) to (i) decline to purchase any of the Shares
tendered in the Offer and terminate the Offer, and return all tendered Shares
to the tendering Holders, (ii) waive or amend any or all conditions to the
Offer and, to the extent permitted by applicable law and applicable rules and
regulations of the Securities and Exchange Commission (the "Commission")
purchase all Shares validly tendered or (iii) subject to the limitations
described below, extend the Offer and, subject to the right of a tendering
Holder to withdraw its Shares until the Expiration Date, retain the Shares
which have been tendered during the period or periods for which the Offer is
extended, provided, however, that, subject to the terms of the Merger
Agreement, without the prior written consent of the Company, Purchaser will
not (i) waive the Minimum Condition, (ii) decrease the price per Share payable
in the Offer, (iii) reduce the maximum number of Shares to be purchased in the
Offer, (iv) amend or add to the conditions to the Offer set forth in Section
14--"Conditions of the Offer", (v) extend the Offer, (vi) change the form of
consideration payable in the Offer, or (vii) amend, add to or waive any other
term of the Offer in any manner which would be adverse to the Company or the
Holders. Notwithstanding the foregoing, Purchaser may, without the consent of
the Company, extend the Offer (i) if, on the scheduled expiration date of the
Offer, any of the conditions to Purchaser's obligation to accept for payment
and pay for the Shares shall not have been satisfied or waived, until the
fifth Business Day after the date Purchaser reasonably believes to be the
earliest date on which such conditions will be satisfied, (ii) for any period
required by any rule, regulation, interpretation or position of the SEC or its
staff applicable to the Offer, or (iii) from time to time for an aggregate
period of not more than 10 business days (for all such extensions) beyond the
latest expiration date that would be permitted under clause (i) or (ii) of
this sentence. Parent and Purchaser have agreed that if immediately prior to
any scheduled expiration date of the Offer, the Regulatory Condition has not
been satisfied or a temporary restraining order prohibiting the purchase of
the Shares shall have been issued by a court of competent jurisdiction in any
country in which the Company or its Subsidiaries have operations material to
the Company and its Subsidiaries, taken as whole, Purchaser shall extend the
Offer from time to time until five business days after the Regulatory
Condition has been satisfied or the lifting of such temporary restraining
order subject to the right of Parent, Purchaser or the Company to terminate
the Merger Agreement pursuant to the terms thereof.

  Subject to the terms of the Merger Agreement and the applicable rules and
regulations of the Commission and to applicable law, Purchaser expressly
reserves the right, in its sole discretion, at any time and from time to time,
to extend for any reason the period of time during which the Offer is open,
including upon the occurrence of any of the events specified in Section 14--
"Conditions of the Offer", by giving notice of such extension to the
Depositary and by making a public announcement thereof. There can be no
assurance that Purchaser will exercise its right to extend the Offer. During
any such extension, all Shares previously tendered and not withdrawn will
remain subject to the Offer, subject to the rights of a tendering Holder to
withdraw its Shares. See Section 4--"Withdrawal Rights".

  Subject to the applicable rules and regulations of the Commission and to
applicable law, Purchaser also expressly reserves the right, in its sole
discretion (subject to the terms of the Merger Agreement), at any time and
from time to time (i) to delay acceptance for payment of, or, regardless of
whether such Shares were theretofore accepted for payment, payment for any
Shares (a) if the HSR Condition has not been satisfied, (b) the EC Condition
has not been satisfied or (c) in order to comply in whole or in part with any
other applicable law, (ii) to terminate the Offer and not accept for payment
any Shares if any of the conditions referred to in Section 14--"Conditions of
the Offer" are not satisfied or any of the events specified in Section 14--
"Conditions of the Offer" have occurred and (iii) subject to the terms of the
Merger Agreement, to waive any condition or otherwise amend the Offer in any
respect by giving oral or written notice of such delay, termination, waiver or
amendment to the Depositary and by making a public announcement thereof,
provided however, that,

                                       3
<PAGE>

subject to the terms of the Merger Agreement, without the prior written
consent of the Company, Purchaser will not (i) waive the Minimum Condition,
(ii) decrease the price per Share payable in the Offer, (iii) reduce the
maximum number of Shares to be purchased in the Offer, (iv) amend or add to
the conditions to the Offer set forth in Section 14--"Conditions of the
Offer", (v) extend the Offer, (vi) change the form of consideration payable in
the Offer, or (vii) amend, add to or waive any other term of the Offer in any
manner which would be adverse to the Company or the Holders.

  Purchaser acknowledges that (i) Rule 14e-1(c) under the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), requires Purchaser to pay the
consideration offered or return the Shares tendered promptly after the
termination or withdrawal of the Offer and (ii) Purchaser may not delay
acceptance for payment of, or payment for (except as provided in clause (i) of
the preceding paragraph), any Shares upon the occurrence of any of the
conditions specified in Section 14--"Conditions of the Offer" without
extending the period of time during which the Offer is open.

  During any such extension, all Shares previously tendered and not withdrawn
will remain subject to the Offer, subject to the right of a tendering Holder
to withdraw its Shares. Any such extension, delay, termination, waiver or
amendment will be followed, as promptly as practicable, by public announcement
thereof, with such announcement in the case of an extension to be made no
later than 9:00 a.m., New York City time, on the next business day after the
previously scheduled expiration date. Subject to applicable law (including
Rules 14d-4(c), 14d-6(d) and 14e-1 under the Exchange Act, which require that
material changes be promptly disseminated to Holders in a manner reasonably
designed to inform them of such changes) and without limiting the manner in
which Purchaser may choose to make any public announcement, Purchaser will
have no obligation to publish, advertise or otherwise communicate any such
public announcement other than by issuing a press release to the Dow Jones
News Service or as otherwise may be required by applicable law.

  If Purchaser makes a material change in the terms of the Offer or the
information concerning the Offer, or if it waives a material condition of the
Offer, Purchaser will extend the Offer to the extent required by Rules 14d-
4(c), 14d-6(d) and 14e-1 under the Exchange Act. The minimum period during
which an offer must remain open following material changes in the terms of the
Offer or information concerning the Offer, other than a change in price or a
change in the percentage of securities sought, will depend upon the facts and
circumstances then existing, including the relative materiality of the changed
terms or information. With respect to a change in price or a change in the
percentage of securities sought, a minimum period of ten business days is
generally required to allow for adequate dissemination to Holders and investor
response.

  The Company has provided Purchaser with the Company's shareholder lists and
security position listings in respect of the Shares for the purpose of
disseminating the Offer to Purchase, the Letter of Transmittal and other
relevant materials to Holders. This Offer to Purchase, the Letter of
Transmittal and other relevant materials will be mailed to record holders of
Shares whose names appear on the Company's list of Holders and will be
furnished, for subsequent transmittal to beneficial owners of Shares, to
brokers, dealers, commercial banks, trust companies and similar persons whose
names, or the names of whose nominees, appear on the Company's list of Holders
or, where applicable, who are listed as participants in the security position
listing of The Depository Trust Company ("DTC").

  2. Acceptance for Payment and Payment for Shares. Upon the terms and subject
to the conditions of the Offer (including, if the Offer is extended or
amended, the terms and conditions of any such extension or amendment),
Purchaser will purchase, by accepting for payment, and will pay for, all
Shares validly tendered prior to the Expiration Date (and not properly
withdrawn in accordance with Section 4--"Withdrawal Rights") as promptly as
practicable after the later to occur of (i) the Expiration Date or (ii) the
satisfaction or waiver of the conditions set forth in Section 14--"Conditions
of the Offer." Subject to applicable rules of the Commission and the terms of
the Merger Agreement, Purchaser expressly reserves the right, in its
discretion, to delay acceptance for payment of, or payment for, Shares in
order to comply, in whole or in part, with any applicable

                                       4
<PAGE>

law, including, but not limited to, the receipt of the regulatory approvals
specified in Section 15--"Certain Legal Matters; Regulatory Approvals." If,
following acceptance for payment of Shares, Purchaser asserts such regulatory
approvals as a condition and does not promptly pay for Shares tendered,
Purchaser will promptly return such Shares. Notwithstanding the fact that
Purchaser reserves the right to assert the non-occurrence of a condition set
forth in Section 14--"Conditions of the Offer" following acceptance for
payment of Shares but prior to payment for Shares, in order to delay payment
or cancel its obligation to pay for properly tendered Shares, Purchaser
understands that all conditions to the Offer other than receipt of necessary
regulatory approvals, must be satisfied or waived prior to the Expiration
Date.

  In all cases, payment for Shares purchased pursuant to the Offer will be
made only after timely receipt by the Depositary of (i) the certificates
evidencing such Shares (the "Certificates") or timely confirmation of a book-
entry transfer (a "Book-Entry Confirmation") of such Shares into the
Depositary's account at DTC (the "Book-Entry Transfer Facility"), pursuant to
the procedures set forth in Section 3--"Procedures for Tendering Shares", (ii)
the Letter of Transmittal (or a copy thereof), properly completed and duly
executed with any required signature guarantees, or an Agent's Message (as
defined below) in connection with a book-entry transfer and (iii) any other
documents required to be included with the Letter of Transmittal under the
terms and subject to the conditions thereof and to this Offer to Purchase.

  The term "Agent's Message" means a message, transmitted by the Book-Entry
Transfer Facility to, and received by, the Depositary forming a part of a
Book-Entry Confirmation system, which states that the Book-Entry Transfer
Facility has received an express acknowledgment from a participant in the
Book-Entry Transfer Facility tendering the Shares that such participant has
received and agrees to be bound by the terms of the Letter of Transmittal and
that Purchaser may enforce such agreement against such participant.

  For purposes of the Offer, Purchaser will be deemed to have accepted for
payment (and thereby purchased) Shares validly tendered and not properly
withdrawn if, as and when Purchaser gives oral or written notice to the
Depositary of Purchaser's acceptance for payment of such Shares. Upon the
terms and subject to the conditions of the Offer, payment for Shares accepted
pursuant to the Offer will be made by deposit of the purchase price therefor
with the Depositary, which will act as agent for tendering Holders for the
purpose of receiving payments from Purchaser and transmitting payments to such
tendering Holders whose Shares have been accepted for payment. UNDER NO
CIRCUMSTANCES WILL INTEREST ON THE PURCHASE PRICE FOR SHARES BE PAID BY
PURCHASER, REGARDLESS OF ANY DELAY IN MAKING SUCH PAYMENT OR EXTENSION OF THE
EXPIRATION DATE. Upon the deposit of funds with the Depositary for the purpose
of making payments to tendering Holders, Purchaser's obligation to make such
payment shall be satisfied, and tendering Holders must thereafter look solely
to the Depositary for payment of amounts owed to them by reason of the
acceptance for payment of Shares pursuant to the Offer.

  If any tendered Shares are not accepted for payment for any reason pursuant
to the terms and conditions of the Offer, or if Certificates are submitted
evidencing more Shares than are tendered, certificates evidencing Shares not
purchased will be returned, without expense to the tendering Holder (or, in
the case of Shares tendered by book-entry transfer into the Depositary's
account at the Book-Entry Transfer Facility pursuant to the procedure set
forth in Section 3--"Procedures for Tendering Shares", such Shares will be
credited to an account maintained at the Book-Entry Transfer Facility), as
promptly as practicable following the expiration or termination of the Offer.

  If, prior to the Expiration Date, Purchaser increases the consideration to
be paid per Share pursuant to the Offer, Purchaser will pay such increased
consideration for all such Shares purchased pursuant to the Offer, whether or
not such Shares were tendered prior to such increase in consideration.

  Purchaser reserves the right to assign to Parent, or to any other direct or
indirect wholly owned subsidiary of Parent, the right to purchase all or any
portion of the Shares tendered pursuant to the Offer, but any such

                                       5
<PAGE>

assignment will not relieve Purchaser of its obligations under the Offer and
will in no way prejudice the rights of tendering Holders to receive payment
for Shares validly tendered and accepted for payment pursuant to the Offer.

  3. Procedures for Tendering Shares.

  Valid Tender of Shares. In order for Shares to be validly tendered pursuant
to the Offer, a Holder must, prior to the Expiration Date, either (i) deliver
to the Depositary at one of its addresses set forth on the back cover of this
Offer to Purchase (a) a properly completed and duly executed Letter of
Transmittal (or a copy thereof) with any required signature guarantees, (b)
the certificates representing Shares to be tendered and (c) any other
documents required to be included with the Letter of Transmittal under the
terms and subject to the conditions thereof and of this Offer to Purchase,
(ii) cause such Holder's broker, dealer, commercial bank or trust company to
tender applicable Shares pursuant to the procedures for book-entry transfer
described below or (iii) comply with the guaranteed delivery procedures
described below.

  The method of delivery of Certificates, the Letter of Transmittal and all
other required documents, including delivery through the Book-Entry Transfer
Facility, is at the option and risk of the tendering Holder, and the delivery
will be deemed made only when actually received by the Depositary. If delivery
is by mail, registered mail with return receipt requested, properly insured,
is recommended. In all cases, sufficient time should be allowed to ensure
timely delivery.

  Book-Entry Transfer. The Depositary will establish an account with respect
to the Common Stock at the Book-Entry Transfer Facility for purposes of the
Offer within two business days after the date of this Offer to Purchase. Any
financial institution that is a participant in the Book-Entry Transfer
Facility's system may make book-entry delivery of Shares by (i) causing such
securities to be transferred in accordance with the Book-Entry Transfer
Facility's procedures into the Depositary's account and (ii) causing the
Letter of Transmittal to be delivered to the Depositary by means of an Agent's
Message. Although delivery of Shares may be effected through book-entry
transfer, either the Letter of Transmittal (or a manually signed facsimile
thereof), properly completed and duly executed, together with any required
signature guarantees, or an Agent's Message in lieu of the Letter of
Transmittal, and any other required documents, must, in any case, be
transmitted to and received by the Depositary prior to the Expiration Date at
one of its addresses set forth on the back cover of this Offer to Purchase, or
the tendering Holder must comply with the guaranteed delivery procedures
described below. Delivery of documents or instructions to the Book-Entry
Transfer Facility in accordance with the Book-Entry Transfer Facility's
procedures does not constitute delivery to the Depositary.

  Signature Guarantee. All signatures on a Letter of Transmittal must be
guaranteed by a financial institution (including most banks, savings and loan
associations and brokerage houses) that is a participant in the Security
Transfer Agents Medallion Program, the New York Stock Exchange Medallion
Signature Guarantee Program or the Stock Exchange Medallion Program (an
"Eligible Institution"), unless the Shares tendered thereby are tendered (i)
by the registered holder of Shares who has not completed the box entitled
"Special Payment Instructions" on the Letter of Transmittal or (ii) for the
account of an Eligible Institution. See Instruction 1 to the Letter of
Transmittal.

  If a Certificate is registered in the name of a person other than the signer
of the Letter of Transmittal, or if payment is to be made, or a Certificate
not accepted for payment or not tendered is to be returned to a person other
than the registered holder(s), then the Certificate must be endorsed or
accompanied by appropriate stock powers, in either case signed exactly as the
name(s) of the registered holder(s) appear(s) on the Certificate, with the
signature(s) on such certificate or stock powers guaranteed as described
above. See Instructions 1, 5 and 7 to the Letter of Transmittal.

  Guaranteed Delivery. If a Holder desires to tender Shares pursuant to the
Offer and such Holder's Certificates are not immediately available or time
will not permit all required documents to reach the Depositary prior to the
Expiration Date or the procedure for book-entry transfer cannot be completed
on a timely basis, such Shares may nevertheless be tendered if all the
following conditions are satisfied:

    (i) such tender is made by or through an Eligible Institution;

                                       6
<PAGE>

    (ii) a properly completed and duly executed Notice of Guaranteed
  Delivery, substantially in the form provided by Purchaser, is received by
  the Depositary as provided below prior to the Expiration Date; and

    (iii) the certificates for all tendered Shares in proper form for
  transfer, together with a properly completed and duly executed Letter of
  Transmittal (or a copy thereof) with any required signature guarantee (or,
  in the case of a book-entry transfer, a Book-Entry Confirmation along with
  an Agent's Message) and any other documents required by such Letter of
  Transmittal, are received by the Depositary within three Trading Days after
  the date of execution of the Notice of Guaranteed Delivery. A "Trading Day"
  is any day on which the New York Stock Exchange is open for business.

  Any Notice of Guaranteed Delivery may be delivered by hand to the Depositary
or transmitted by facsimile transmission, or by mail to the Depositary and
must include a guarantee by an Eligible Institution in the form set forth in
the Notice of Guaranteed Delivery. In the case of Shares held through the
Book-Entry Transfer Facility, the Notice of Guaranteed Delivery must be
delivered to the Depositary by a participant by means of the confirmation
system of the Book-Entry Transfer Facility.

  Other Requirements. Notwithstanding any other provision hereof, payment for
Shares accepted for payment pursuant to the Offer will, in all cases, be made
only after timely receipt by the Depositary of (i) certificates evidencing
such Shares or a Book-Entry Confirmation of the delivery of such Shares
(unless Purchaser elects, in its sole discretion, to make payment for such
Shares pending receipt of the certificates or a Book-Entry Confirmation, if
available, with respect to such certificates), (ii) a properly completed and
duly executed Letter of Transmittal or a copy thereof with any required
signature guarantees (or, in the case of a book-entry transfer, an Agent's
Message) and (iii) any other documents required by the Letter of Transmittal.
Accordingly, tendering Holders may be paid at different times depending upon
when certificates for Shares or Book-Entry Confirmations with respect to
Shares are actually received by the Depositary. Under no circumstances will
interest be paid on the purchase price of the Shares to be paid by Purchaser,
regardless of any extension of the Offer or any delay in making such payment.

  Tender Constitutes an Agreement. The valid tender of Shares pursuant to one
of the procedures described above will constitute a binding agreement between
the tendering Holder and Purchaser on the terms and subject to the conditions
of the Offer.

  Determination of Validity. All questions as to the validity, form,
eligibility (including, but not limited to, time of receipt) and acceptance
for payment of any tendered Shares pursuant to any of the procedures described
above will be determined by Purchaser, in its sole discretion, whose
determination will be final and binding on all parties. Purchaser reserves the
absolute right to reject any or all tenders of any Shares determined by it not
to be in proper form or if the acceptance for payment of, or payment for, such
Shares may, in the opinion of Purchaser's counsel, be unlawful. Purchaser also
reserves the absolute right, in its sole discretion, to waive any of the
conditions of the Offer (subject to the terms of the Merger Agreement) or any
defect or irregularity in any tender with respect to Shares of any particular
Holder, whether or not similar defects or irregularities are waived in the
case of other Holders. No tender of Shares will be deemed to have been validly
made until all defects and irregularities have been cured or waived.

  Purchaser's interpretation of the terms and conditions of the Offer
(including the Letter of Transmittal and the instructions thereto) will be
final and binding.

  Appointment as Proxy. By executing a Letter of Transmittal (or delivering an
Agent's Message) as set forth above, a tendering Holder irrevocably appoints
each designee of Purchaser as such Holder's attorney-in-fact and proxy, with
full power of substitution, to vote in such manner as such attorney-in-fact
and proxy (or any substitute thereof) shall deem proper in its sole
discretion, and to otherwise act (including pursuant to written consent) to
the full extent of such Holder's rights with respect to the Shares tendered by
such Holder and accepted for payment by Purchaser (and any and all dividends,
distributions, rights or other securities issued or issuable in respect of
such Shares on or after June 27, 1999). All such proxies shall be considered
coupled with

                                       7
<PAGE>

an interest in the tendered Shares and shall be irrevocable. This appointment
will be effective if, when, and only to the extent that, Purchaser accepts
such Shares for payment pursuant to the Offer. Upon such acceptance for
payment, all prior proxies given by such Holder with respect to such Shares
and other securities will, without further action, be revoked, and no
subsequent proxies may be given (and, if given, will not be deemed effective).
The designees of Purchaser will, with respect to the Shares and other
securities for which the appointment is effective, be empowered to exercise
all voting and other rights of such Holder as they in their sole discretion
may deem proper at any annual, special, adjourned or postponed meeting of the
Company's stockholders, by written consent in lieu of any such meeting or
otherwise. Purchaser reserves the right to require that, in order for Shares
to be deemed validly tendered, immediately upon Purchaser's acceptance for
payment of such Shares, Purchaser must be able to exercise all rights
(including, without limitation, all voting rights) with respect to such Shares
and receive all dividends and distributions.

  Backup Withholding. Under United States federal income tax law, the amount
of any payments made by the Depositary to Holders (other than corporate and
certain other exempt Holders) pursuant to the Offer may be subject to backup
withholding tax at a rate of 31%. To avoid such backup withholding tax with
respect to payments made pursuant to the Offer, a non-exempt, tendering U.S.
Holder (as defined in Section 5--"Certain United States Federal Income Tax
Consequences") must provide the Depositary with such Holder's correct taxpayer
identification number and certify under penalties of perjury that such Holder
is not subject to backup withholding tax by completing the Substitute Form W-9
included as part of the Letter of Transmittal. If backup withholding applies
with respect to a Holder or if a Holder fails to deliver a completed
Substitute Form W-9 to the Depositary or otherwise establish an exemption, the
Depositary is required to withhold 31% of any payments made to such Holder.
See Section 5--"Certain United States Federal Income Tax Consequences" of this
Offer to Purchase and the information set forth under the heading "Important
Tax Information" contained in the Letter of Transmittal.

  4. Withdrawal Rights. Tenders of Shares made pursuant to the Offer are
irrevocable except that such Shares may be withdrawn at any time prior to the
Expiration Date and, unless theretofore accepted for payment by Purchaser
pursuant to the Offer, may also be withdrawn at any time after August 30,
1999, or at such later time as may apply if the Offer is extended.

  If Purchaser extends the Offer, is delayed in its acceptance for payment of
Shares or is unable to accept Shares for payment pursuant to the Offer for any
reason, then, without prejudice to Purchaser's rights under the Offer, the
Depositary may, nevertheless, on behalf of Purchaser, retain tendered Shares,
and such Shares may not be withdrawn except to the extent that tendering
Holders are entitled to withdrawal rights as described in this Section 4--
"Withdrawal Rights". Any such delay will be an extension of the Offer to the
extent required by law.

  For a withdrawal to be effective, a written or facsimile transmission notice
of withdrawal must be timely received by the Depositary at one of its
addresses set forth on the back cover of this Offer to Purchase. Any such
notice of withdrawal must specify the name of the person who tendered the
Shares to be withdrawn, the number of Shares to be withdrawn, and the name of
the registered holder of such Shares, if different from that of the person who
tendered such Shares. If certificates evidencing Shares to be withdrawn have
been delivered or otherwise identified to the Depositary, then, prior to the
physical release of such Certificates, the serial numbers shown on such
Certificates must be submitted to the Depositary and the signature(s) on the
notice of withdrawal must be guaranteed by an Eligible Institution, unless
such Shares have been tendered for the account of an Eligible Institution.
Shares tendered pursuant to the procedure for book-entry transfer as set forth
in Section 3--"Procedures for Tendering Shares", may be withdrawn only by
means of the withdrawal procedures made available by the Book-Entry Transfer
Facility, must specify the name and number of the account at the Book-Entry
Transfer Facility to be credited with the withdrawn Shares and must otherwise
comply with the Book-Entry Transfer Facility's procedures.

  Withdrawals of tendered Shares may not be rescinded without Purchaser's
consent and any Shares properly withdrawn will thereafter be deemed not
validly tendered for purposes of the Offer. All questions as to the form

                                       8
<PAGE>

and validity (including time of receipt) of notices of withdrawal will be
determined by Purchaser, in its sole discretion, which determination will be
final and binding. None of Parent, Purchaser, the Depositary, the Information
Agent, the Dealer Manager or any other person will be under any duty to give
notification of any defects or irregularities in any notice of withdrawal or
incur any liability for failure to give any such notification.

  Any Shares properly withdrawn may be re-tendered at any time prior to the
Expiration Date by following any of the procedures described in Section 3--
"Procedures for Tendering Shares".

  5. Certain United States Federal Income Tax Consequences. The receipt of
cash for Shares pursuant to the Offer or the Merger by a U.S. Holder (defined
below) will be a taxable transaction for United States federal income tax
purposes and may also be a taxable transaction under applicable state, local
or foreign tax laws. For purposes of this discussion, a "U.S. Holder" is a
beneficial owner of Shares who for United States federal income tax purposes
is (i) a citizen or resident of the United States; (ii) a corporation or
partnership organized in or under the laws of the United States or any State
thereof (including the District of Columbia); (iii) an estate the income of
which is subject to United States federal income taxation regardless of its
source; or (iv) a trust if such trust has validly elected to be treated as a
United States person for United States federal income tax purposes or a trust
(a) the administration over which a United States court can exercise primary
supervision and (b) all of the substantial decisions of which one or more
United States persons have the authority to control.

  In general, a U.S. Holder will recognize gain or loss for United States
federal income tax purposes equal to the difference, if any, between the
amount realized from the sale of Shares and such U.S. Holder's adjusted tax
basis in such Shares. Assuming that the Shares constitute a capital asset in
the hands of the U.S. Holder, such gain or loss will be capital gain or loss.
In the case of a noncorporate U.S. Holder, the maximum marginal United States
federal income tax rate applicable to such gain will be lower than the maximum
marginal United States federal income tax rate applicable to ordinary income
if such U.S. Holder's holding period for such Shares exceeds one year.

  The foregoing discussion may not be applicable to certain types of Holders,
including Holders who acquired Shares pursuant to the exercise of stock
options or otherwise as compensation, Holders that are not U.S. Holders and
Holders that are otherwise subject to special tax rules, such as financial
institutions, insurance companies, dealers or traders in securities or
currencies, tax-exempt entities, persons that hold Shares as a position in a
"straddle" or as part of a "hedging" or "conversion" transaction for tax
purposes and persons that have a "functional currency" other than the United
States dollar.

  Backup Withholding Tax. As noted in Section 3--"Procedures for Tendering
Shares", a Holder (other than an "exempt recipient", including a corporation,
a non-U.S. Holder that provides appropriate certification and certain other
persons (if the payor does not have actual knowledge that such certificate is
false)) that receives cash in exchange for Shares may be subject to United
States federal backup withholding tax at a rate equal to 31%, unless such
Holder provides its taxpayer identification number and certifies that such
Holder is not subject to backup withholding tax by submitting a completed
Substitute Form W-9 to the Depositary. Accordingly, each U.S. Holder should
complete, sign and submit the Substitute Form W-9 included as part of the
Letter of Transmittal in order to avoid the imposition of such backup
withholding tax.

  The United States federal income tax discussion set forth above is included
for general information and is based upon income tax laws, regulations,
rulings and decisions now in effect, all of which are subject to change
(possibly retroactively). Holders are urged to consult their tax advisors with
respect to the specific tax consequences of the Offer to them, including the
application and effect of the alternative minimum tax and state, local and
foreign tax laws.

  6. Price Range; Dividends.

  Common Stock. The primary market for the Common Stock is the New York Stock
Exchange. In addition, the Common Stock is listed and traded on the Chicago
Stock Exchange. The ticker symbol for the

                                       9
<PAGE>

Common Stock is "NLC". The following table sets forth, for the periods
indicated, the high and low sales prices per share of Common Stock on the New
York Stock Exchange as reported by the Dow Jones News Service:

<TABLE>
<CAPTION>
                                                              High       Low
                                                            --------- ---------
   <S>                                                      <C>       <C>
   1997:
     Quarter ended 9/30/97................................. $41 5/8   $38 15/16
     Quarter ended 12/31/97................................  42 7/16   37 13/16
   1998:
     Quarter ended 3/31/98.................................  40 5/8    37 1/2
     Quarter ended 6/30/98.................................  40 7/8    34 7/16
     Quarter ended 9/30/98.................................  36 1/8    28 1/16
     Quarter ended 12/31/98................................  34 5/16   28 3/8
   1999:
     Quarter ended 3/31/99.................................  30 15/16  26
     Quarter ended 6/30/99.................................  26 3/4    51 7/8
</TABLE>

  On June 23, 1999, the day before the Company announced that it was in talks
about a possible business combination transaction, the reported closing sales
price of the Common Stock on the New York Stock Exchange was $37 1/4 per share
of Common Stock. On June 25, 1999, the last full trading day prior to the
public announcement of the Offer, the reported closing sales price of the
Common Stock on the New York Stock Exchange was $42 1/2 per share of Common
Stock. On June 30, 1999, the last full trading day prior to the date of this
Offer to Purchase, the last reported sales price of the Common Stock on the
New York Stock Exchange was $51 7/8 per share. Holders of Common Stock are
urged to obtain current market quotations for the Common Stock.

  The following table sets forth the aggregate per share of Common Stock
amount of dividends paid on the Common Stock during the periods indicated:

<TABLE>
<CAPTION>
                                                                Dividend Amount
                                                                ---------------
   <S>                                                          <C>
   1996:
     Quarter ended 9/30/96.....................................      $0.25
     Quarter ended 12/31/96....................................      $0.25
   1997:
     Quarter ended 3/31/97.....................................      $0.25
     Quarter ended 6/30/97.....................................      $0.25
     Quarter ended 9/30/97.....................................      $0.25
     Quarter ended 12/31/97....................................      $0.25
   1998:
     Quarter ended 3/31/98.....................................      $0.25
     Quarter ended 6/30/98.....................................      $0.25
     Quarter ended 9/30/98.....................................      $0.25
     Quarter ended 12/31/98....................................      $0.25
   1999:
     Quarter ended 3/31/99.....................................      $0.25
     Quarter ended 6/30/99.....................................      $0.25
</TABLE>

  The Merger Agreement prohibits the Company from declaring or paying any
dividends until the effective date of the Merger, except for the regular
quarterly dividend previously declared.

                                      10
<PAGE>

  ESOP Preferred Stock. The ESOP Preferred Stock is not listed on any exchange
or traded on the Nasdaq National Market. No price quotations are available for
the ESOP Preferred Stock.

  7. Certain Information Concerning the Company.

  The Company. The information concerning the Company contained in this Offer
to Purchase, including financial information, has been taken from or is based
upon publicly available documents and records on file with the Commission and
other public sources. Neither Parent nor Purchaser assumes any responsibility
for the accuracy or completeness of the information concerning the Company
contained in such documents and records or for any failure by the Company to
disclose events which may have occurred or may affect the significance or
accuracy of any such information but which are unknown to Parent or Purchaser.

  The Company manufactures and markets specialty water treatment and process
chemicals and services worldwide. The Company serves customers in steelmaking,
pulp and papermaking, mining and mineral processing, automotive, metalmaking,
oil refining and petroleum, power generation, food and beverage, light
industrial, hospitals, and office buildings in more than 120 countries. The
Company is a Delaware corporation. The address of the Company's principal
executive offices is One Nalco Center, Naperville, Illinois 60563. The
telephone number of the Company at such offices is (630) 305-1000.

  Financial Information. Set forth below is certain selected consolidated
financial information relating to the Company and its subsidiaries which has
been excerpted or derived from the financial statements contained in the
Company's Annual Reports on Form 10-K for the fiscal years ended December 31,
1998, 1997 and 1996 and the Company's Quarterly Report on Form 10-Q for the
fiscal quarter ended March 31, 1999. More comprehensive financial information
is included in these reports and other documents filed by the Company with the
Commission. The financial information that follows is qualified in its
entirety by reference to these reports and other documents, including the
financial statements and related notes contained therein. These reports and
other documents may be inspected at, and copies may be obtained from, the same
places and in the manner set forth below under "--Available Information".

                                      11
<PAGE>

                             Nalco Chemical Company

               SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA
                     ($ in millions except per share data)

<TABLE>
<CAPTION>
                                                                Three Months
                                 Year Ended December 31,      Ended March 31,
                                ----------------------------  -----------------
                                  1996      1997      1998      1998     1999
                                --------  --------  --------  --------  -------
                                                                (unaudited)
<S>                             <C>       <C>       <C>       <C>       <C>
Statement of Operations:
Revenues......................  $1,303.5  $1,433.7  $1,573.5  $  367.1  $ 410.2
Operating costs and expenses:
  Cost of products sold.......     568.6     629.6     714.1     164.9    184.8
  Selling, administrative and
   research...................     518.2     561.4     618.0     145.9    152.2
  Cost reduction program......                 --      180.0       --       --
                                --------  --------  --------  --------  -------
    Total operating costs and
     expenses.................   1,086.8   1,191.0   1,512.1     310.8    337.0
Operating income (loss).......     216.7     242.7      61.4      56.3     73.2
  Interest and investment
   income.....................       2.6       0.7       2.4       1.0      1.2
  Interest expense............     (14.4)    (15.3)    (26.5)     (4.9)    (8.2)
  Equity in earnings of
   partnership................      24.5      28.2      22.6       7.3      4.6
Earnings from Continuing
 Operations Before Income
 Taxes........................     229.4     256.3      59.9      59.7     70.8
Income tax (expense)/benefit..      83.5      92.9      22.0      21.7     25.5
                                --------  --------  --------  --------  -------
Earnings from Continuing
 Operations...................     145.9     163.4      37.9       --       --
Earnings from Discontinued
 Operations...................       8.6       --        --        --       --
Cumulative Effect of Change in
 Accounting for Business
 Process Reengineering Costs..       --      (4.5)       --        --       --
                                --------  --------  --------  --------  -------
  Net of Taxes................
  Net Earnings................  $  154.5  $  158.9  $   37.9  $   38.0  $  45.3
                                ========  ========  ========  ========  =======
Per Share of Common Stock
 Earnings from Continuing
  Operations--Diluted.........     $1.86     $2.10     $0.40     $0.49    $0.60
Discontinued Operations.......       .11       --        --        --       --
Accounting Change.............       --       (.06)      --        --       --
                                --------  --------  --------  --------  -------
Net Earnings..................      1.97      2.04       .40      0.53     0.65
                                ========  ========  ========  ========  =======
Cash Dividends Paid...........      1.00      1.00      1.00      0.25     0.25
Consolidated Balance Sheet
 Data:
  Working Capital.............  $   95.5  $  153.4  $  126.3  $  163.1  $ 226.4
  Property, plant and
   equipment, net.............     522.0     492.5     517.3     498.9    496.7
  Total assets................   1,394.5   1,440.9   1,650.7   1,505.3   1661.6
  Long-term Debt..............     252.6     335.3     496.2     364.8    569.3
  Deferred Income Taxes.......      42.9      37.2      15.6      34.7     29.0
  Total Shareholders' Equity..     654.5     652.7     585.9     677.1    605.9
</TABLE>


                                       12
<PAGE>

  Certain Projected Financial Data of the Company. Prior to entering into the
Merger Agreement, Parent conducted a due diligence review of the Company and
in connection with such review received certain non-public information
provided by the Company, including certain projected financial data (the
"Projections") for the year ending December 31, 1999. The Company does not in
the ordinary course publicly disclose projections and the Projections were not
prepared with a view to public disclosure. The Company has advised Parent and
Purchaser that the Projections were prepared by the Company's management based
on numerous assumptions including, among others, assumptions regarding various
matters that could affect the amount and timing of the Company's future
revenues, operating income, benefits and other expenses, depreciation and
amortization and capital expenditure. The Projections do not give effect to
the Offer, expenditure requirements or the potential combined operations of
Parent and the Company. The Projections are set forth below in this Offer to
Purchase for the limited purpose of giving Holders access to financial
projections prepared by the Company's management that were made available to
Parent and Purchaser in connection with the Merger Agreement and the Offer.

                            Nalco Chemical Company
                    Selected 1999 Projected Financial Data
                (In Millions of Dollars Except Per Share Data)

<TABLE>
<CAPTION>
                                                    Second Third Fourth  Total
                                                     Qtr    Qtr   Qtr    Year
                                                    ------ ----- ------ -------
<S>                                                 <C>    <C>   <C>    <C>
Net Sales.......................................... 408.8  423.0 418.7  1,645.7
Cost of Products Sold.............................. 184.3  192.7 190.7    747.7
                                                    -----  ----- -----  -------
Gross Earnings..................................... 224.5  230.3 228.0    898.0
                                                    -----  ----- -----  -------
Total Operating Expenses........................... 133.4  135.9 137.5    535.6
                                                    -----  ----- -----  -------
Operating Earnings.................................  68.5   69.5  64.6    267.4
                                                    -----  ----- -----  -------
Earnings Before Taxes..............................  64.6   65.6  61.8    253.1
 Income Taxes......................................  23.1   23.5  22.1     90.6
                                                    -----  ----- -----  -------
Net Earnings.......................................  41.5   42.1  39.7    162.5
                                                    =====  ===== =====  =======
Earnings Per Share................................. $0.55  $0.56 $0.52  $  2.15
</TABLE>

          Cautionary Statements Concerning Forward-Looking Statements

  Certain matters discussed herein, including, but not limited to the
Projections, are forward-looking statements that involve risks and
uncertainties. Forward-looking statements include the information set forth
above in "Certain Projected Financial Data of the Company".

  While presented with numerical specificity, the Projections are necessarily
based upon a variety of estimates and hypothetical assumptions which may not
be accurate, may not be realized, and are also inherently subject to
significant business, economic and competitive uncertainties and
contingencies, all of which are difficult to predict, and many of which are
beyond the control of the Company. Accordingly, there can be no assurance that
the Projections will be realized and the actual results for the fiscal year
ending December 31, 1999 may vary materially from those shown above. None of
Parent, Purchaser or the Company is under any obligation or has any intention
to update the Projections at any future time.

  In addition, the Projections were not prepared in accordance with generally
accepted accounting principles, and neither the Company's nor Parent's
independent accountants have examined or compiled the Projections or expressed
any conclusion or provided any other form of assurance with respect to the
Projections and accordingly assume no responsibility for the Projections. The
Projections were not prepared with a view to public disclosure or compliance
with the published guidelines of the Commission or the guidelines established
by the American Institute of Certified Public Accountants regarding
projections, which would require a more complete

                                      13
<PAGE>

presentation of data than as shown above. The inclusion of the Projections
herein should not be regarded as a representation by Parent, Purchaser, the
Company or any other person that the projected results will be achieved. The
Projections should be read in conjunction with the historical financial
information of the Company included above. Neither Parent nor Purchaser
assumes any responsibility for the accuracy, reasonableness, reliability or
validity of the foregoing Projections nor has the Company made any
representations to Parent or Purchaser regarding such Projections.

  Available Information. The Company is subject to the information and
reporting requirements of the Exchange Act and is required to file reports and
other information with the Commission relating to its business, financial
condition and other matters. Information, as of particular dates, concerning
the Company's directors and officers, their remuneration, stock options
granted to them, the principal holders of the Company's securities, any
material interests of such persons in transactions with the Company and other
matters is required to be disclosed in reports filed with the Commission.
These reports and other information should be available for inspection at the
public reference facilities of the Commission located in Judiciary Plaza, 450
Fifth Street, N.W., Washington, D.C. 20549, and also should be available for
inspection and copying at prescribed rates at regional offices of the
Commission located at Seven World Trade Center, New York, New York 10048 and
500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of this
material may also be obtained by mail, upon payment of the Commission's
customary fees, from the Commission's principal office at 450 Fifth Street,
N.W., Washington, D.C. 20549. Electronic filings filed through the
Commission's Electronic Data Gathering, Analysis and Retrieval system
("EDGAR"), including those made by or in respect of the Company, are publicly
available through the Commission's home page on the Internet at
http://www.sec.gov.

  8. Certain Information Concerning Purchaser and Parent.

  Purchaser. Purchaser, a newly incorporated Delaware corporation, has not
conducted any business other than in connection with the Offer and the Merger
Agreement. All of the issued and outstanding shares of capital stock of
Purchaser are beneficially owned by Parent. The principal address of Purchaser
is c/o Suez Lyonnaise des Eaux, 1, rue d'Astorg, 75008 Paris, France. The
telephone number is 011-33-1-40-06-64-00.

  Parent. Parent, a societe anonyme organized and existing under the laws of
the Republic of France, operates private infrastructure services in more than
120 countries, providing electricity and natural gas, waste treatment,
communications services, and water services and maintains interests in
construction, retail finance, real estate holdings, capital investments,
metals extraction, foam products, electronics, and steel. Suez Lyonnaise des
Eaux was formed from the 1997 merger of Compagnie de Suez (builder of the Suez
Canal) and Lyonnaise des Eaux. The principal executive offices of Parent are
located at 1, rue d'Astorg, 75008 Paris, France. The telephone number is 011-
33-1-40-06-64-00.

  During the last five years, none of Parent, Purchaser or, to the best of
their knowledge, any of the persons listed in Schedule I hereto (i) has been
convicted in a criminal proceeding (excluding traffic violations and similar
misdemeanors) or (ii) was a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such
proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting activities subject to, federal or state
securities laws or finding any violation of such laws.

  Except as described in this Offer to Purchase (i) none of Parent, Purchaser
or, to the best of their knowledge, any of the persons listed in Schedule I to
this Offer to Purchase, or any associate or majority-owned subsidiary of
Parent or Purchaser, beneficially owns or has any right to acquire, directly
or indirectly, any equity securities of the Company and (ii) none of Parent,
Purchaser, or to the best of their knowledge, any of the persons or entities
referred to above or any director, executive officer or subsidiary of any of
the foregoing has effected any transaction in such equity securities during
the past 60 days. Purchaser and Parent disclaim beneficial ownership of any
Common Stock owned by any pension plans of Parent or Purchaser or any
affiliate of Parent or Purchaser.

  Except as described in this Offer to Purchase, none of Parent, Purchaser or,
to the best of their knowledge, any of the persons listed in Schedule I to
this Offer to Purchase has any contract, arrangement, understanding or

                                      14
<PAGE>

relationship with any other person with respect to any securities of the
Company, including, but not limited to, any contract, arrangement,
understanding or relationship concerning the transfer or voting of such
securities, joint ventures, loan or option arrangements, puts or calls,
guaranties of loans, guaranties against loss or the giving or withholding of
proxies. Except as set forth in this Offer to Purchase, since January 1, 1996,
none of Parent, Purchaser or to the best of their knowledge, any of the
persons listed on Schedule I hereto has had any business relationship or
transaction with the Company or any of its executive officers, directors or
affiliates that is required to be reported under the rules and regulations of
the Commission applicable to the Offer. Except as set forth in this Offer to
Purchase, since January 1, 1996, there have been no contacts, negotiations or
transactions between any of Parent, Purchaser or any of their subsidiaries or,
to the best knowledge of Parent or Purchaser, any of the persons listed in
Schedule I to this Offer to Purchase, on the one hand, and the Company or its
affiliates, on the other hand, concerning a merger, consolidation or
acquisition, tender offer or other acquisition of securities, an election of
directors or a sale or other transfer of a material amount of assets.

  Available Information. Parent is not subject to the informational reporting
requirements of the Exchange Act and is not required to file reports and other
information with the Commission relating to its businesses, financial
condition or other matters.

  9. Source and Amount of Funds. The Offer is not conditioned upon any
financing arrangements. The amount of funds required by Purchaser to purchase
all of the outstanding Common Stock pursuant to the Offer and to pay related
fees and expenses is expected to be approximately $4.1 billion. Purchaser will
obtain such funds from Parent. Parent anticipates that it will obtain such
funds from existing cash, marketable securities and available credit lines.

  The margin regulations promulgated by the Board of Governors of the Federal
Reserve System (the "Federal Reserve Board") place restrictions on the amount
of credit that may be extended for the purposes of purchasing margin stock,
including if such credit is secured directly or indirectly by margin stock.
Purchaser believes that the financing of the acquisition of the Shares will be
in full compliance with, or not subject to, the margin regulations.


  10. Background of the Offer. On April 9, 1999, a representative of Goldman
Sachs, the Company's financial advisor, contacted Christian Maurin, Chairman
and Chief Executive Officer of Degremont, a wholly owned subsidiary of Parent,
to inform Mr. Maurin that the Company was looking for strategic options which
could include a role for Degremont. The following week, a meeting was held in
Paris, France, attended by W. Steven Weeber, Vice Chairman and Executive Vice
President of the Company, Christian Maurin, Pascal Remy, Executive Vice
President of Degremont, Charles Dupont, Chief Executive Officer of Degremont
and representatives of Goldman. At this meeting, Mr. Weeber confirmed that the
Company was considering various strategic options, including a possible sale
of the Company. The parties discussed Degremont's potential suitability as a
strategic partner with the Company.

  Degremont entered into a confidentiality agreement with the Company, dated
as of April 13, 1999, and was subsequently provided with background
information relating to the Company and its operations.

  On April 21, 1999, representatives of Degremont and the Company met in
Chicago. The Company made a general presentation, describing its plans to
Patrick Buffet, Executive Vice President of Parent, Gerard Sussmann, Vice
President of Parent, Messrs. Maurin and Remy. E.J. Mooney, Chairman and Chief
Executive Officer of the Company, Mr. Weeber, William Buchholz, Chief
Financial Officer of the Company, James Lambe, Senior Vice President for Human
Resources of the Company, William Parry, General Counsel of the Company,
Goldman Sachs and other representatives of the Company answered questions
presented by Parent, Degremont and J.P. Morgan, financial advisor to Parent
and Degremont.

  From April 27 through May 31, 1999, there was on-going contact between
Degremont and the Company. Throughout such conversations, Degremont expressed
its interest in acquiring the Company in a cash transaction, funded from the
Parent's assets. Various meetings and discussions were held by and among the
following members of the management teams of both Degremont and Parent, on the
one hand, and the Company, on the

                                      15
<PAGE>

other hand: Messrs. Maurin, Remy and Dupont from Degremont, Buffet and
Sussmann, from Parent, and Mooney, Weeber, Parry and Buchholz, from the
Company. At a meeting held in Paris, on May 17-18, 1999, Gerard Mestrallet,
Chairman and Chief Executive Officer of Parent, Philippe Brongniart and
Francois Jaclot, Members of the Managing Board of Parent, met with Mr. Mooney.
At these meetings, the parties exchanged views on growth drivers and the
potential for synergies stemming from the proposed combination of the two
companies. Representatives from the financial advisors of the Company, Goldman
Sachs, and of Degremont and Parent, J.P. Morgan, participated in some of these
discussions.

  On June 9, 1999, Messrs. Maurin and Mooney reached an understanding on
exclusive negotiations at an indicated price level of $54.00 per share of
Common Stock, subject to the outcome of due diligence reviews.

  On June 11, 1999, a data room was established at the offices of
PricewaterhouseCoopers ("PWC"), the Company's accountants, in Rosemont,
Illinois. Additionally, on June 11, Messrs. Maurin, Buffet and Sussmann met
with Messrs. Mooney, Buchholz, Weeber and Lambe. The Company was represented
in this meeting and the due diligence review by Goldman Sachs and Shearman &
Sterling, its legal advisor. Representatives of White & Case, Parent's legal
advisor, J.P. Morgan and Arthur Andersen, Parent's accountants, conducted due
diligence reviews of the Company, based on documents provided by the Company
and PWC, through June 15, 1999. This review continued through the next two
weeks, with additional documents requested and provided directly or through an
ancillary data room at PWC's New York office.

  During the weeks of June 13, and June 20, 1999, representatives of
Degremont, Parent and the Company continued discussions regarding the
acquisition. In particular, the parties discussed the employee and management
benefits packages, the 1998 accounts and the Company's growth assumptions and
business climate. On June 24, 1999, four Division Managers of the Company:
George Brannon, III, John T. Burns, William Roe and Michael E. Kahler met with
Parent and Degremont to discuss their employment arrangements. Representatives
of Parent and Degremont also met with the Company's senior management
regarding the terms of their continued employment with the Company after its
acquisition by Parent.

  At the end of that week, the parties agreed upon an offer price of $53.00
per share of Common Stock. On June 27, 1999, Parent was informed that the
Board of Directors had met and approved Parent's offer, the Merger and the
Merger Agreement. Later that evening, the Merger Agreement was executed by
Parent, Purchaser and the Company. Contemporaneously with the execution of the
Merger Agreement, agreements setting forth terms of continued employment were
executed by Messrs. Brannon, Burns, Roe, Keller, Weeber, Mooney, Buchholz,
Lambe and Newlin.

  11. Purpose of the Offer; Plans for the Company; Certain Agreements.

  Purpose of the Offer. The purpose of the Offer is to enable Parent to
acquire as many outstanding Shares as possible as a first step in acquiring
the entire equity interest in the Company. The purpose of the Merger is for
Parent to acquire all Shares not purchased pursuant to the Offer. Upon
consummation of the Merger, the Company will become a direct wholly owned
subsidiary of Parent. The Offer is being made pursuant to the Merger
Agreement.

  Under the DGCL, the approval of the Company's Board of Directors and the
affirmative vote of the holders of a majority of the outstanding Common Stock
is required to approve and adopt the Merger Agreement and the transactions
contemplated thereby, including the Merger. In addition, the Company's
Certificate of Incorporation provides that the affirmative vote of 60% of the
Holders that are not a Control Person (as defined in the Certificate of
Incorporation of the Company) is required to approve and adopt the Merger
Agreement and the transactions contemplated thereby, including the Merger
unless (a) the company into which the Company would be merged is a subsidiary
of the Company, or (b) each of (x) the cash or fair market value of the
property, securities or other consideration to be received per share in the
business combination by holders of the Common Stock is not less than the
higher of (i) the highest price per share (including brokerage commissions,
soliciting dealers' fees and dealer-management compensation) paid by such
Control Person in acquiring any of its holdings of the Common Stock, or (ii)
the highest per share market price of Common Stock during the three-month
period

                                      16
<PAGE>

immediately preceding the date of the proxy statement; and (y) a proxy
statement responsive to the requirements of the Exchange Act, whether or not
the Company is then subject to such requirements, shall be mailed to the
public stockholders of the Company for the purpose of soliciting stockholder
approval of such business combination, shall be true (subparagraphs (x) and
(y) are collectively referred to herein as the "Fair Price Provision").

  The Company's Board of Directors has duly adopted resolutions that (i)
determined that the Merger is advisable and that the Merger Agreement and the
transactions contemplated thereby, including the Offer and the Merger, are
fair to and in the best interests of the Holders; (ii) approved and adopted
the Merger Agreement and the transactions contemplated thereby, and (iii)
recommended the acceptance of the Offer, the approval of the Merger and the
approval and adoption of the Merger Agreement by the stockholders of the
Company. The only remaining required corporate action of the Company is the
approval and adoption of the Merger Agreement and the transactions
contemplated thereby by the affirmative vote of the Holders, in accordance
with the Fair Price Provision.

  In the Merger Agreement, the Company has agreed to take all action necessary
to convene a meeting of its stockholders as soon as practicable after the
consummation of the Offer for the purpose of considering and taking action on
the Merger Agreement and the transactions contemplated thereby if such action
is required by the DGCL.

  If Purchaser purchases Shares pursuant to the Offer, the Merger Agreement
provides that Purchaser will be entitled to designate representatives to serve
on the Board of Directors of the Company in proportion to Purchaser's
ownership of Common Stock following such purchase. Purchaser expects that such
representation would permit Purchaser to exert substantial influence over the
Company's conduct of its business and operations.

  Plans for the Company. Subject to certain matters described below, it is
currently expected that, initially following the Merger, the business and
operations of the Company will generally continue as they are currently being
conducted. Parent currently intends to cause the Company's operations to
continue to be run and managed by, amongst others, the Company's existing
executive officers. Parent will continue to evaluate all aspects of the
business, operations, capitalization and management of the Company during the
pendency of the Offer and after the consummation of the Offer and the Merger
and will take such further actions as it deems appropriate under the
circumstances then existing. Parent intends to seek additional information
about the Company during this period. Thereafter, Parent intends to review
such information as part of a comprehensive review of the Company's business,
operations, capitalization and management.

  As a result of the Offer, the interest of Parent in the Company's net book
value and net earnings will be in proportion to the number of Shares acquired
in the Offer. If the Merger is consummated, Parent's interest in such items
and in the Company's equity generally will equal 100% and Parent and its
subsidiaries will be entitled to all benefits resulting from such interest,
including all income generated by the Company's operations and any future
increase in the Company's value. Similarly, Parent will also bear the risk of
losses generated by the Company's operations and any future decrease in the
value of the Company after the Merger. Subsequent to the Merger, current
stockholders of the Company will cease to have any equity interest in the
Company, will not have the opportunity to participate in the earnings and
growth of the Company after the Merger and will not have any right to vote on
corporate matters. Similarly, stockholders will not face the risk of losses
generated by the Company's operations or decline in the value of the Company
after the Merger.

  Shares of Common Stock are currently traded on the New York Stock Exchange
and the Chicago Stock Exchange. Following the consummation of the Merger, the
Common Stock will no longer be quoted on the New York Stock Exchange or the
Chicago Stock Exchange and the registration of the Common Stock under the
Exchange Act will be terminated. Accordingly, after the Merger there will be
no publicly traded equity securities of the Company outstanding and the
Company will no longer be required to file periodic reports with the
Commission. See Item 13--"Effect of the Offer on the Market for the Common
Stock; Exchange Act Registration". It is expected that, if Shares are not
accepted for payment by Purchaser pursuant to the Offer and

                                      17
<PAGE>

the Merger is not consummated, the Company's current management, under the
general direction of the Board of Directors, will continue to manage the
Company as an ongoing business.

  Except as otherwise discussed in this Offer to Purchase, Parent has no
present plans or proposals that would result in any extraordinary corporate
transaction, such as a merger, reorganization, liquidation involving the
Company or any of its subsidiaries, or sale or transfer of a material amount
of assets of the Company or any of its subsidiaries or in any other material
changes to the Company's capitalization, dividend policy, corporate structure,
business or composition of the Board of Directors or the management of the
Company except that Parent intends to review the composition of the boards of
directors (or similar governing bodies) of the Company and its subsidiaries
and to cause the election to such boards of directors (or similar governing
bodies) of certain of its representatives.

Merger Agreement

  The following is a summary of the material terms of the Merger Agreement.
The summary is qualified in its entirety by reference to the Merger Agreement
which is incorporated herein by reference and a copy of which has been filed
with the Commission as an exhibit to the Schedule 14D-1. The Merger Agreement
may be inspected at, and copies may be obtained from, the same places and in
the manner set forth in Section 7--"Certain Information Concerning the
Company".

  The Offer. The Merger Agreement provides that Purchaser will commence the
Offer and that the obligation of Purchaser to consummate the Offer and to
accept for payment and to pay for any Common Stock and any ESOP Preferred
Stock tendered pursuant to the Offer shall be subject to only those conditions
set forth therein. The obligations of Purchaser to accept for payment and to
pay for any Shares tendered shall be subject only to those conditions set
forth in Section 14--"Conditions of the Offer". Purchaser expressly reserves
the right to waive any such conditions, to increase the Offer Price and to
make any other changes in the terms and conditions of the Offer; provided,
however, that without the prior written consent of the Company, Parent and
Purchaser shall not (i) waive the Minimum Condition, (ii) decrease the Offer
Price, (iii) reduce the maximum number of Shares to be purchased in the Offer,
(iv) amend or add to the conditions to the Offer set forth in Section 14--
"Conditions of the Offer", (v) extend the Offer, (vi) change the form of
consideration payable in the Offer, or (vii) amend, add to or waive any other
term of the Offer in any manner which would be adverse to the Company or the
Holders. Notwithstanding the foregoing, Purchaser may, without the consent of
the Company, extend the Offer: (i) if, on the scheduled expiration date of the
Offer any of the conditions to Purchaser's obligation to accept for payment
and pay for the Shares have not been satisfied or waived, until the fifth
business day after the day Purchaser reasonably believes to be the earliest
date on which such conditions will be satisfied; (ii) for any period required
by any rule, regulation, interpretation or position of the Commission or its
staff applicable to the Offer; or (iii) from time to time, for an aggregate
period of not more than 10 business days (for all such extensions) beyond the
latest expiration date that would be permitted under the foregoing clauses (i)
and (ii). In addition, if, on the scheduled expiration date of the Offer, (i)
the Regulatory Condition has not been satisfied or waived or (ii) a temporary
restraining order prohibiting the purchase of the Shares shall have been
issued by a court of competent jurisdiction in any country in which the
Company or its Subsidiaries have operations material to the Company and its
Subsidiaries, taken as a whole, Purchaser shall extend the Offer from time to
time until five business days after the satisfaction or waiver of the
Regulatory Condition or the lifting of such temporary restraining order,
subject to the right of Parent, Purchaser or the Company to terminate the
Merger Agreement pursuant to the terms thereof. The Offer Price shall be net
to the seller in cash, upon the terms and subject to the conditions of the
Offer. Subject to the conditions of the Offer, Purchaser shall, and Parent
shall cause Purchaser to, pay, as promptly as practicable after expiration of
the Offer, for all Shares which are validly tendered and not withdrawn.

  Pursuant to the terms of the Merger Agreement, the Company has approved of
and consented to the Offer and has represented that (a) its Board of
Directors, at a meeting duly called and held on June 27, 1999, has duly
adopted resolutions that (i) determined that the Merger is advisable and that
the Merger Agreement and the transactions contemplated thereby, including the
Merger and the Offer, are fair to and in the best interests of the

                                      18
<PAGE>

Holders, (ii) approved and adopted the Merger Agreement and the transactions
contemplated thereby, (iii) recommended the acceptance of the Offer, the
approval of the Merger and the approval and adoption of the Merger Agreement
by the stockholders of the Company and (iv) approved the taking of all other
applicable action necessary to render Section 203 of the DGCL and other state
takeover statutes and the Rights Agreement inapplicable to the Offer and the
Merger; and (b) Goldman Sachs has delivered to the Board of Directors of the
Company its written opinion, as of the date of the Merger Agreement, that the
consideration to be received by the Holders of shares of Common Stock pursuant
to each of the Offer and the Merger is fair to the Holders of shares of Common
Stock from a financial point of view.

  The Merger. The Merger Agreement provides that, subject to the terms and
conditions thereof, and in accordance with the DGCL, Purchaser shall be merged
with and into the Company on the date the Merger Agreement or a certificate of
merger or a certificate of ownership and merger (in either case, the
"Certificate of Merger") is filed (such date, the "Effective Time") with the
Secretary of State of the State of Delaware. The filing of the Certificate of
Merger shall be made as promptly as practicable after the satisfaction or, if
permissible, waiver of the conditions to the Merger. Following the Merger, the
separate corporate existence of Purchaser shall thereupon cease and the
Company shall continue as the surviving corporation of the Merger (the
"Surviving Corporation") and shall continue its corporate existence as a
Subsidiary of Parent and shall continue to be governed by the laws of the
State of Delaware.

  At the Effective Time by virtue of the Merger and without any action by
Parent, Purchaser, the Company or the holders thereof, (a) each share of
Common Stock issued and outstanding immediately prior to the Effective Time
(other than any shares of Common Stock held by any wholly owned subsidiary of
the Company or in the treasury of the Company, or which are held, directly or
indirectly by Parent, Purchaser or any direct or indirect subsidiary of Parent
or the Company, which shares of Common Stock will be canceled without any
conversion thereof and none of which shall receive any payment or distribution
with respect thereto, and other than shares of Common Stock, if any, held by
Holders who perfect their appraisal rights under the DGCL) will be canceled
and converted into the right to receive $53.00 in cash payable to the Holder
thereof, without interest thereon, equal to the price paid for each share of
common stock pursuant to the Offer, and (b) each share of ESOP Preferred Stock
issued and outstanding immediately prior to the Effective Time (other than
shares of ESOP Preferred Stock held by any wholly owned subsidiary of the
Company or in the treasury of the Company, or which are held, directly or
indirectly by Parent, Purchaser or any direct or indirect subsidiary of Parent
or the Company, which shares of ESOP Preferred Stock will be canceled without
any conversion thereof and none of which shall receive any payment or
distribution with respect thereto and other than shares of ESOP Preferred
Stock, if any, held by Holders who perfect their appraisal rights under the
DGCL) shall be canceled and shall be converted automatically into the right to
receive $1,060.00 payable, without interest, to the holder of such share of
ESOP Preferred Stock ((a) and (b) together, the "Merger Consideration"). In
addition, at the Effective Time, each share of the capital stock of Purchaser
issued and outstanding immediately prior to the Effective Time will be
converted into, and exchanged for, one validly issued, fully paid and
nonassessable share of common stock of the Surviving Corporation.

  The Merger Agreement provides that the respective obligations of Parent and
Purchaser, on the one hand, and the Company, on the other hand, to effect the
Merger are subject to the fulfillment, at or prior to the Effective Time, of
each of the following conditions: (i) to the extent required by Delaware law
and the Restated Certificate of Incorporation of the Company, the Merger
Agreement and the transactions contemplated thereby shall have been approved
and adopted by the affirmative vote of the stockholders of the Company; (ii)
no United States federal or state or Republic of France governmental authority
or other agency or commission or court of competent jurisdiction shall have
enacted, issued, promulgated, enforced or entered any law, rule, regulation,
executive order, decree, injunction or other order (whether temporary,
preliminary or permanent) which is then in effect and has the effect of
prohibiting consummation of the Merger; (iii) Purchaser or its permitted
assignee shall have purchased all Shares validly tendered and not withdrawn
pursuant to the Offer; (iv) any waiting period (and any extension thereof)
applicable to the consummation of the Merger under the HSR Act shall have
expired or been terminated and the Commission of the European Union shall have
approved the transactions under

                                      19
<PAGE>

Regulation (EC) 4064/89, as amended, of the Council of the European Union; and
(v) any review or approval required by governmental authorities in countries
in which the Company or its subsidiaries have operations material to the
Company and the Subsidiaries (as defined in the Merger Agreement), taken as a
whole, shall have been completed or obtained.

  Certificate of Incorporation and By-laws; Directors and Officers of the
Surviving Corporation. The Merger Agreement provides that, at the Effective
Time, the directors of Purchaser immediately prior to the Effective Time shall
be the initial directors of the Surviving Corporation until their successors
have been duly elected or appointed and qualified in accordance with the
Surviving Corporation's Certificate of Incorporation and By-laws. The officers
of the Company immediately prior to the Effective Time shall be the initial
officers of the Surviving Corporation until their respective successors are
duly elected or appointed and qualified. In addition, at the Effective Time,
the Restated Certificate of Incorporation of the Company shall be restated in
a form acceptable to Purchaser and shall be the Certificate of Incorporation
of the Surviving Corporation until thereafter amended as provided by law and
such Certificate of Incorporation; provided, however, the Certificate of
Incorporation shall be in accordance with the indemnification provisions of
the Merger Agreement. The by-laws of Purchaser, as in effect immediately prior
to the Effective Time, shall be the by-laws of the Surviving Corporation until
thereafter amended as provided by law, the Certificate of Incorporation of the
Surviving Corporation and such by-laws.

  Company Stockholders' Meeting. Pursuant to the Merger Agreement, promptly
following the purchase of Shares pursuant to the Offer, if required by the
DGCL in order to consummate the Merger, the Company, acting through its Board
of Directors, shall, in accordance with applicable law and the Company's
Restated Certificate of Incorporation and By-laws, duly call, give notice of,
convene and hold an annual or special meeting of its stockholders (the
"Company Stockholders' Meeting") for the purpose of considering and taking
action on the Merger Agreement and the transactions contemplated thereby and,
subject to the fiduciary duties of the Board under applicable law as
determined by the Board in good faith after receiving the advice of
experienced, independent counsel, include in the Proxy Statement the
recommendation of the Board that the stockholders of the Company approve and
adopt the Merger Agreement and the transactions contemplated thereby and use
all reasonable efforts to obtain such approval and adoption. Parent and
Purchaser have also agreed to cause all Shares then owned by them and their
subsidiaries to be voted in favor of the approval and adoption of the Merger
Agreement and the transactions contemplated thereby. The record date for the
Company Stockholders' Meeting shall be a date subsequent to the date Parent or
Purchaser becomes a record holder of Shares purchased pursuant to the Offer.

  The Company has agreed that, if stockholder approval of the Merger is
required by applicable law, the Company will, as soon as practicable following
the consummation of the Offer, prepare and file the Proxy Statement (as
defined in the Merger Agreement) with the Commission and will use all
reasonable efforts to cause the Proxy Statement to be cleared by the
Commission. Parent, Purchaser and the Company have agreed to cooperate with
each other in the preparation of the Proxy Statement. The Company has agreed
to notify Parent of the receipt of any comments of the Commission with respect
to the Proxy Statement and of any requests by the Commission for any amendment
or supplement thereto or for additional information and to provide to Parent
promptly copies of all correspondence between the Company, or any
representative of the Company, and the Commission or its staff. The Company
also agreed to give Parent and its counsel the opportunity to review the Proxy
Statement prior to its being filed with the Commission and to give Parent and
its counsel the opportunity to review the Proxy Statement prior to its being
filed with the Commission and to give Parent and its counsel the opportunity
to review all amendments and supplements to the Proxy Statement and all
responses to requests for additional information and replies to comments prior
to their being filed with, or sent to, the Commission. The Company, Parent and
Purchaser shall, pursuant to the Merger Agreement, use all reasonable efforts,
after consultation with the other parties thereto, to respond promptly to all
such comments of and requests by the Commission and to cause the Proxy
Statement and all required amendments and supplements thereto to be mailed to
the Holders entitled to vote at the Stockholders' Meeting at the earliest
practicable time.


                                      20
<PAGE>

  Board Representation. The Merger Agreement provides that promptly upon the
purchase by Purchaser of Shares pursuant to the Offer, and from time to time
thereafter, Purchaser shall be entitled to designate up to such number of
directors, rounded up to the next whole number, on the Board as shall give
Purchaser representation on the Board equal to the product of the total number
of directors on the Board (giving effect to the directors elected pursuant to
this sentence) multiplied by the percentage that the aggregate number of
shares of Common Stock beneficially owned by Purchaser or any affiliate of
Purchaser following such purchase bears to the total number of shares of
Common Stock then outstanding. The Company shall, at such time, promptly take
all actions necessary to cause Purchaser's designees to be elected as
directors of the Company, including increasing the size of the Board or
securing the resignations of incumbent directors or both. At such times, the
Company shall use all reasonable efforts to cause persons designated by
Purchaser to constitute the same percentage of each committee of the Board as
persons designated by Purchaser to constitute the Board to the extent
permitted by applicable law.

  The Company shall promptly take all actions required pursuant to Section
14(f) of the Exchange Act and Rule 14f-1 promulgated thereunder in order to
fulfill its obligations described in the previous paragraph and shall include
in its Schedule 14D-9 such information with respect to the Company and its
officers and directors as is required under Section 14(f) and Rule 14f-1 to
fulfill such obligations. Parent or Purchaser shall supply to the Company and
be solely responsible for any information with respect to either of them and
their nominees, officers, directors and affiliates required by such Section
14(f) and Rule 14f-1.

  Interim Operations. The Merger Agreement provides that except as described
in the Company's disclosure statement (the "Company Disclosure Statement")
delivered concurrently with the delivery of the Merger Agreement, during the
period from the date of the Merger Agreement to the Effective Time, the
Company shall, and shall cause each of its Subsidiaries to, conduct its
business only in the ordinary course and shall use all reasonable efforts to
preserve substantially intact the business organizations of the Company and
the Subsidiaries, to keep available the service of its current officers and
employees, and to preserve the current relationships of the Company and the
Subsidiaries with customers, suppliers and other persons with which the
Company or any Subsidiary has significant business relations. As amplification
of the foregoing, except as contemplated by the Merger Agreement or the
Company Disclosure Schedule, neither the Company nor any Subsidiary shall,
between the date of the Merger Agreement and the Effective Time, directly or
indirectly do, or propose to do, any of the following without the prior
written consent of Parent:

    (a) amend or otherwise change its Certificate of Incorporation or By-laws
  or equivalent organizational documents;

    (b) issue, deliver, sell, pledge, dispose of, grant, encumber, or
  authorize the issuance, delivery, sale, pledge, disposition, grant or
  encumbrance of (i) any shares of capital stock of any class of the Company
  or any Subsidiary, or any options, warrants, convertible securities or
  other rights of any kind to acquire any shares of such capital stock, or
  any other ownership interest (including, without limitation, any phantom
  interest), of the Company or any Subsidiary (except for the issuance of
  Shares issuable pursuant to stock options outstanding on the date of the
  Merger Agreement) or (ii) any assets of the Company or any Subsidiary for
  consideration in excess of $25,000,000 in the aggregate;

    (c) declare, set aside, make or pay any dividend or other distribution,
  payable in cash, stock, property or otherwise, with respect to any of its
  capital stock, except for regular quarterly dividends on the Shares
  declared and paid at times consistent with past practices;

    (d) reclassify, combine, split, subdivide, or issue or authorize the
  issuance of any other securities in respect of, in lieu of or in
  substitution for shares of its capital stock, or redeem, purchase or
  otherwise acquire, directly or indirectly, any shares of the capital stock
  of the Company or any of the Subsidiaries or any other securities thereof
  or any rights, warrants or options to acquire any such shares or other
  securities;

    (e) (i) acquire (including, without limitation, by merger, consolidation,
  or acquisition of stock or assets) any corporation, partnership, other
  business organization or any division thereof for consideration in excess
  of $10,000,000 in the aggregate; (ii) except for borrowings under existing
  credit facilities not to exceed $30,000,000 in the aggregate and excepting
  transactions between the Company and any Subsidiary,

                                      21
<PAGE>

  incur any indebtedness for borrowed money or issue any debt securities or
  assume, guarantee or endorse, or otherwise as an accommodation become
  responsible for, the obligations of any person; (iii) except for
  transactions between the Company and any Subsidiary, make any loans,
  advances, or capital contributions to, or investments in, any person, for
  an amount in excess of $10,000,000 in the aggregate; (iv) authorize capital
  expenditures which are, in the aggregate, in excess of $25,000,000 for the
  Company and the Subsidiaries; (v) acquire any assets for consideration in
  excess of $10,000,000 in the aggregate; or (vi) enter into or amend any
  contract, agreement, commitment or arrangement with respect to any of the
  foregoing;

    (f) except as provided in the Company Disclosure Schedule, as
  contemplated by the Merger Agreement or in the ordinary course of business
  consistent with past practices (i) increase the compensation payable or to
  become payable to its officers or employees, (ii) other than in accordance
  with existing policies and arrangements, grant any severance pay or (iii)
  establish, adopt, enter into or amend any collective bargaining, bonus,
  profit sharing, thrift, compensation, stock option, restricted stock,
  pension, retirement, deferred compensation, employment, termination,
  severance or other plan, agreement, trust, fund, policy or arrangement for
  the benefit of any director, officer or employee, except as contemplated by
  the Merger Agreement or to the extent required by applicable law or the
  terms of a collective bargaining agreement or a contractual obligation
  existing on the date hereof;

    (g) other than as required by generally accepted accounting principles,
  make any change to its accounting policies or procedures;

    (h) agree to the settlement of any claim or litigation which would have a
  Material Adverse Effect (as such term is defined in the Merger Agreement);

    (i) make, change or rescind any material tax election (other than (i)
  recurring elections that customarily are made in connection with the filing
  of any tax return, provided that any such elections are consistent with the
  past practices of the Company or the Subsidiaries, as the case may be; (ii)
  gain recognition agreements under Section 367 of the Code and Treasury
  regulations thereunder with respect to transactions occurring in the 1998
  fiscal year of the Company; and (iii) elections with respect to
  Subsidiaries purchased by the Company under Section 338(h)(10) of the Code
  or, solely in the case of non-U.S. Subsidiaries purchased by the Company,
  Section 338(g) of the Code) or settle or compromise any material tax
  liability that is the subject of an audit, claim for delinquent Taxes,
  examination, action, suit, proceeding or investigation by any taxing
  authority;

    (j) except to the extent required under existing employee and director
  benefit plans, agreements or arrangements as in effect on the date of the
  Merger Agreement or as contemplated by the Merger Agreement, accelerate the
  payment, right to payment or vesting of any bonus, severance, profit
  sharing, retirement, deferred compensation, stock option, insurance or
  other compensation or benefits;

    (k) pay, discharge or satisfy any material claims, material liabilities
  or material obligations (absolute, accrued, asserted or unasserted,
  contingent or otherwise), other than the payment, discharge or satisfaction
  (A) of any such material claims, material liabilities or material
  obligations in the ordinary course of business and consistent with past
  practice or (B) of material claims, material liabilities or material
  obligations reflected or reserved against in, or contemplated by, the
  consolidated financial statements (or the notes thereto) contained in the
  Company reports to the Commission;

    (l) enter into any agreement, understanding or commitment that restrains,
  limits or impedes the Company's or any of the Subsidiaries' ability to
  compete with or conduct any business or line of business, including, but
  not limited to, geographic limitations on the Company's or any of the
  Subsidiaries' activities;

    (m) materially modify, amend or terminate any material contract to which
  it is a party or waive any of its material rights or claims except in the
  ordinary course of business consistent with past practice; or

    (n) agree or enter into, in writing or otherwise, or amend any contract,
  agreement, commitment or arrangement with respect to any of the actions set
  forth in the foregoing.


                                      22
<PAGE>

  No Solicitation. The Company has agreed that it shall, and shall direct and
use all reasonable efforts to cause its officers, directors, employees and
agents (including accountants, counsel, financial advisors and other
representatives) to, immediately cease any discussions or negotiations with
any parties that may be ongoing with respect to any Acquisition Proposal (as
defined below). The Company shall not, nor shall it permit any of the
Subsidiaries to, nor shall it authorize or permit any officer, director or
employee of, or any agent (including accountants, counsel, financial advisors
and other representatives) of, the Company or any of the Subsidiaries to,
directly or indirectly, (i) solicit, facilitate or initiate, or knowingly
encourage the submission of, any Acquisition Proposal (including, without
limitation, the taking of any action which would make Section 203 of the DGCL
inapplicable to the Acquisition Proposal) or (ii) participate in any
discussions or negotiations regarding, or furnish or disclose to any person or
legal entity (other than Parent or Purchaser) any information with respect to,
or take any other action to facilitate any inquiries or the making of any
proposal that constitutes, or may reasonably be expected to lead to, an
Acquisition Proposal; provided, however, that if, prior to the acceptance for
payment of Shares pursuant to the Offer, the Board of Directors determines in
good faith that it is necessary to do so in accordance with its fiduciary
duties to the Company's stockholders under applicable law as advised by
experienced, independent counsel, the Company may, in response to an
unsolicited Acquisition Proposal, and subject to compliance with the notice
provision described below, (x) furnish or disclose information with respect to
the Company and the Subsidiaries to any third party pursuant to a customary
confidentiality agreement on terms no less favorable to the Company nor more
favorable to such third party than those contained in the Confidentiality
Agreement and (y) participate in negotiations regarding such Acquisition
Proposal.

  For purposes of the Merger Agreement, "Acquisition Proposal" means any bona
fide inquiry, proposal or offer from any third party relating to any direct or
indirect acquisition or purchase of all or a substantial part of the assets of
the Company or of over 20% of the voting securities of the Company, any tender
offer or exchange offer that if consummated would result in any person
beneficially owning 20% or more of the voting securities of the Company, any
merger, consolidation, business combination, sale of substantially all the
assets, recapitalization, liquidation, dissolution or similar transaction
involving the Company, other than the transactions contemplated by the Merger
Agreement, or any other transaction the consummation of which could reasonably
be expected to impede, interfere with, prevent or materially delay the Offer
or the Merger or which could reasonably be expected to dilute materially the
benefits to Parent of the transactions contemplated by the Merger Agreement.

  (b) Except as described below, neither the Board of Directors nor any
committee thereof shall (i) withdraw or modify, or propose to withdraw or
modify, in a manner adverse to Parent or Purchaser, the approval or
recommendation by the Board of Directors or any such committee of the Offer,
the Merger Agreement or the Merger, (ii) approve or recommend, or propose to
approve or recommend, any Acquisition Proposal or (iii) cause the Company to
enter into any agreement with respect to any Acquisition Proposal or any
letter of intent, agreement in principle, or other similar understanding or
arrangement with respect to an Acquisition Proposal or any understanding,
arrangement or agreements requiring or incentivizing the Company to abandon,
terminate or fail to consummate the Merger or any of the transactions
contemplated thereby. Notwithstanding the foregoing, in the event prior to the
time of acceptance for payment of Shares pursuant to the Offer the Board of
Directors determines in good faith that it is necessary to do so in accordance
with its fiduciary duties to the Company's stockholders under applicable law
as advised by experienced, independent counsel, the Board of Directors may
recommend to its stockholders an Acquisition Proposal and in connection
therewith withdraw or adversely modify its approval or recommendation of the
Offer or the Merger if (i) a third party makes a Superior Proposal, and
(ii)(A) five Business Days have elapsed following delivery to Parent of a
written notice of the determination by the Board of Directors to take such
action and during such five Business Day period the Company has fully
cooperated with Parent, with the intent of enabling Parent and Purchaser, on
the one hand, and the Company, on the other hand, to agree to a modification
of this Agreement and (B) at the end of such five Business Day period, the
Acquisition Proposal continues to constitute a Superior Proposal, and
concurrently therewith or afterwards the Board of Directors may terminate the
Merger Agreement pursuant to its terms in order to permit the Company to enter
into any agreement with respect to any such Superior Proposal; provided, that
any agreement with a third party with respect to a Superior Proposal shall
provide an opportunity for Parent (and any other

                                      23
<PAGE>

person) to make an additional final bid for the Company and, if such bid would
constitute a Superior Proposal, for the Company to accept such bid.

  For purposes of the Merger Agreement, a "Superior Proposal" means any bona
fide proposal made by a third party to acquire, directly or indirectly, for
consideration consisting of cash and/or securities, all outstanding Shares
pursuant to a tender offer or a merger or purchase of all of the assets of the
Company (i) on terms which the Board of Directors determines in good faith
(based on the written advice of a financial advisor of nationally recognized
reputation) to be more favorable to the Company and its stockholders than the
transactions contemplated by the Merger Agreement, as proposed to be modified
by Parent in accordance with the provisions of the preceding paragraph, (ii)
for which financing, to the extent required, is then available (it being
understood that financing evidenced by highly confident letters and similar
letters shall not be considered "available"), and (iii) which is not subject
to any financing or due diligence condition.

  In addition to the above obligations, immediately after receipt thereof, the
Company shall advise Parent in writing of any request for information
regarding an Acquisition Proposal, or any inquiry or proposal with respect to
an Acquisition Proposal. The Company shall keep Parent informed of the status
of any such request or Acquisition Proposal. The Company shall promptly
provide to Parent any non-public information concerning the Company provided
to any other person in connection with any Acquisition Proposal which was not
previously provided to Parent.

  Notwithstanding the above, nothing shall prohibit the Company from taking
and disclosing to its stockholders a position contemplated by Rule 14e-2(a)
promulgated under the Exchange Act or from making any disclosure to the
Company's stockholders if the Board determines in good faith that it is
necessary to do so in accordance with its fiduciary duties to the Company's
stockholders under applicable law as advised by experienced, independent
counsel.

  The Company shall not release any third party from, or waive any provision
of, any confidentiality or standstill agreement to which the Company is a
party. The Company has requested each person or entity which has heretofore
executed a confidentiality agreement in connection with its consideration of
acquiring the Company or any portion thereof to return all confidential
information heretofore furnished to such person or entity by or on behalf of
the Company.

  Directors' and Officers' Indemnification. The Merger Agreement provides that
the certificate of incorporation and by-laws of the Surviving Corporation
shall contain provisions (collectively, "Indemnification Provisions") no less
favorable with respect to indemnification than are set forth in the Restated
Certificate of Incorporation and By-laws of the Company, which provisions
shall not be amended, repealed or otherwise modified for a period of six years
from the Effective Time in any manner that would affect adversely the rights
thereunder of individuals who at the Effective Time were directors, officers,
employees, fiduciaries or agents of the Company, unless such modification
shall be required by law.

  In addition, the Surviving Corporation shall maintain in effect for six
years from the Effective Time, if available, the current directors' and
officers' liability insurance policies maintained by the Company (provided
that Parent and the Surviving Corporation may substitute therefor policies of
at least the same coverage containing terms and conditions which are not
materially less favorable) with respect to matters occurring prior to the
Effective Time. Notwithstanding the foregoing, in no event shall Parent or the
Surviving Corporation be required to expend more than an amount per year equal
to 200% of current annual premiums paid by the Company for such insurance
(which the Company represents to be $476,525.00 for the 12 month period ended
October 1, 1999) with respect to its obligations described in the preceding
sentence; provided, further that, in the event of an expiration, termination
or cancellation of such current policies, Parent or the Surviving Corporation
shall be required to obtain as much coverage as is possible under
substantially similar policies for such 200% amount.

  Prior the Effective Time, the Company shall, to the fullest extent permitted
under applicable law and regardless of whether the Merger becomes effective,
indemnify and hold harmless, and, after the Effective Time,

                                      24
<PAGE>

the Surviving Corporation shall, to the fullest extent permitted under
applicable law, indemnify and hold harmless, each present and former director,
officer or employee of the Company and each Subsidiary (collectively, the
"Indemnified Parties") against all costs and expenses (including attorneys'
fees), judgments, fines, losses, claims, damages, liabilities and settlement
amounts paid in connection with any claim, action, suit, proceeding or
investigation (whether arising before or after the Effective Time), whether
civil, criminal, administrative or investigative, arising out of or pertaining
to any action or omission in their capacity as an officer, director or
employee whether occurring before or after the Effective Time (including,
without limitation, the transactions contemplated by the Merger Agreement),
for a period of six years after the date hereof. Without limiting the
foregoing, in the event of any such claim, action, suit, proceeding or
investigation, (i) the Company or the Surviving Corporation, as the case may
be, shall pay as incurred, each Indemnified Party's legal and other expenses
(including costs of investigation and preparation), including the fees and
expenses of counsel selected by the Indemnified Party, promptly after
statements therefor are received and (ii) the Company and the Surviving
Corporation shall cooperate in the defense of any such matter; provided,
however, that neither the Company nor the Surviving Corporation shall be
liable for any settlement effected without its written consent (which consent
shall not be unreasonably withheld); and provided, further that, in the event
that any claim for indemnification is asserted or made within such six-year
period, all rights to indemnification in respect of such claim shall continue
until the disposition of such claim. The parties intend, to the extent not
prohibited by applicable law, that this indemnification shall apply without
limitation to negligent acts or omissions of any Indemnified Party. Any
determination to be made as to whether any Indemnified Party has met any
standard of conduct imposed by law shall be made by legal counsel reasonably
acceptable to such Indemnified Party and the Surviving Corporation, retained
at the Surviving Corporation's expense. The Company or the Surviving
Corporation also have agreed to pay all expenses, including counsel fees and
expenses, that any Indemnified Party may incur in enforcing the indemnity and
other obligations provided for above.

  The Merger Agreement provides that in the event the Company, the Surviving
Corporation or Parent or any of their respective successors or assigns (i)
consolidates with or merges into any other person and shall not be the
continuing or surviving corporation or entity of such consolidation or merger
or (ii) transfers all or substantially all of its properties and assets to any
person, then and in each such case, proper provision shall be made so that the
successors and assigns of the Company, the Surviving Corporation or Parent, as
the case may be, shall assume the obligations of this indemnification as set
forth in the Merger Agreement.

  The indemnification in the Merger Agreement is intended to benefit the
Indemnified Parties and their respective heirs, executors and personal
representatives, may be enforced by them and shall be binding on the
successors and assigns of Parent, the Company and the Surviving Corporation.
The Merger Agreement provides that its indemnification provisions shall not
limit or otherwise adversely affect any rights any Indemnified Party may have
under any agreement with the Company or any Subsidiary or the Company's or any
Subsidiary's Articles of Incorporation or By-laws.

  Options. The Company has agreed, immediately prior to the Effective Time, to
(i) terminate the Company Stock Option Plans (as defined below) and any other
plan, program or arrangement providing for the issuance, grant or purchase of
any other interest in respect of the capital stock of the Company or any of
the Subsidiaries without prejudice to the holders of Options (as defined
below), and (ii) amend the provisions of any other Company Benefit Plan (as
defined in the Merger Agreement), or related trust or funding vehicle,
providing for the issuance, holding, transfer or grant of any Shares, or any
interest in respect of any Shares (collectively the "Company Stock Plans"), to
provide no continuing rights to acquire, hold, transfer, or grant any shares
or any interest in any Shares. Prior to the Effective Time, the Company shall
cause all amounts currently held as cash in participant accounts under the
Company's Employee Stock Purchase Program to be returned to the applicable
participants and all previously purchased shares of Common Stock held in such
accounts to be distributed to the applicable participants.

  (b) Parent and the Company have agreed to take all action necessary to (i)
provide that each option to purchase shares of Common Stock (an "Option")
pursuant to the Non-Employee Directors Stock Option Plan, the Company's
Employee Stock Compensation Plan, the 1990 Stock Option Plan and the 1982
Stock Option

                                      25
<PAGE>

Plan or any stock option agreement to which the Company is a party (the
"Company Stock Option Plans"), which is outstanding immediately prior to the
acceptance of the Shares by Purchaser pursuant to the Offer, shall become
fully exercisable and vested, whether or not previously exercisable or vested,
as of the time of such acceptance and (ii) provide that, with respect to each
such Option, the holder thereof shall be entitled to receive from the Company,
at the time payment is made for the Shares tendered pursuant to the Offer, an
amount in cash in cancellation of such Option equal to the difference between
the Merger Consideration and the per share exercise price of such Option,
multiplied by the number of shares of Common Stock to which such Option
remains unexercised, less any income or employment tax withholding required
under the Code or any provision of state or local law. Prior to the acceptance
of the Shares by Purchaser pursuant to the Offer, the Company shall make all
amendments to the Company Stock Plans necessary, and take all actions
necessary, to effect the transactions contemplated by the Merger Agreement.
The Company and Parent shall cooperate, and take all reasonable steps to share
in advance information, to effect the transactions.

  Certain Employee Benefits. Pursuant to the Merger Agreement, Parent and the
Company have agreed to the following with respect to the compensation and
benefits programs of Parent, the Company and the Subsidiaries:

    (a) For a period of one year following the Effective Time, Parent, the
  Company and the Subsidiaries shall continue and maintain the employee
  benefit plans and programs of the Company and the Subsidiaries for active
  and retired employees and former directors of the Company and the
  Subsidiaries as in effect immediately prior to the Effective Time; provided
  that Parent, the Company and the Subsidiaries shall not be obligated to
  continue the Supplemental Management Incentive Plan, the Performance Share
  Plan, the Company Stock Option Plans, the 1984 Restricted Stock Plan, the
  Employee Stock Ownership Plan, the Company Common Stock investment option
  contained in the Profit Sharing, Investment and Pay Deferral Plan (each as
  defined in the Merger Agreement), or any other plan or program providing
  for compensation, in the form of, or based on the value of the stock of
  Parent, the Company or the Subsidiaries, or to provide any other incentive
  plan or benefits in lieu thereof. Notwithstanding the foregoing, during the
  aforesaid period of one year following the Effective Time, Parent, the
  Company and the Subsidiaries shall give due consideration to providing a
  reasonable level of equity based compensation. From and after the Effective
  Time, Parent shall honor, and shall cause the Company and the Subsidiaries
  to honor, in accordance with their terms, all contracts, arrangements,
  policies, plans and commitments of the Company and the Subsidiaries in
  accordance with such terms that are applicable to any current or former
  employees or directors of the Company or the Subsidiaries and that have
  been disclosed or made available to Parent pursuant to the Merger
  Agreement. Parent and the Company acknowledge and agree that the
  transactions contemplated by the Agreement shall constitute, as of the
  Effective Time, a "Change of Control" as such term is defined in the
  Company Change of Control Arrangements (as defined in the Merger
  Agreement).

    (b) To the extent that service is relevant for purposes of eligibility,
  participation or vesting under any employee benefit plan, program or
  arrangement established or maintained by Parent, the Company or any of
  their respective subsidiaries, employees of the Company and the
  Subsidiaries shall be credited with service accrued prior to the Effective
  Time with the Company or any of the Subsidiaries, as the case may be.
  Employees of the Company and the Subsidiaries shall be credited with
  service accrued prior to the Effective Time to the extent service is
  relevant for purposes of benefit accrual (i) with respect to plans,
  programs or arrangements established or maintained by Parent, the Company
  or the Subsidiaries covering predominantly employees employed in the United
  States, and (ii) with respect to plans, programs, or arrangements
  maintained by the Company or the Subsidiaries (and not by Parent or its
  Affiliates other than the Company and the Subsidiaries) covering
  predominantly persons employed outside the United States. Notwithstanding
  the foregoing, the crediting of any service described above shall not
  operate to duplicate any benefit.

    (c) With respect to the payment of bonuses under the Company's Management
  Incentive Plan (the "MIP") for the fiscal year ending December 31, 1999
  (the "1999 Fiscal Year"), the Company has agreed to pay participants in the
  MIP whose employment is terminated by Parent, the Company or any of the
  Subsidiaries without Cause (as defined below) on or after the Effective
  Time and prior to January 1, 2000 a

                                      26
<PAGE>

  bonus under the MIP equal to the pro rata portion of the bonus such
  participant would have earned under the MIP for the 1999 Fiscal Year had
  such participant remained employed through the end of the 1999 Fiscal Year.
  Any payment described in the immediately preceding sentence shall be made
  following the end of the 1999 Fiscal Year, at the same time as such payment
  would have been made had such person remained employed by the Company.

    Notwithstanding the above, any person covered by a Key Executive
  Agreement which remains in effect on the date of such person's termination
  of employment (without Cause) shall receive the payment provided under the
  Key Executive Agreement with respect to any bonus under the MIP in lieu of
  the pro rata payment provided for above. The MIP shall be administered by
  the Company with respect to the 1999 Fiscal Year in accordance with past
  practice.

    (d) (i) Prior to the acceptance of the Shares by Purchaser pursuant to
  the Offer, each restricted stock unit award under the Company's 1984
  Restricted Stock Plan or the Employee Stock Compensation Plan and each
  performance award assigned in 1995 under the Company's Performance Share
  Plan (including restricted stock awarded in the 1995 to 1998 performance
  cycle) (collectively the "Current Stock Awards") shall become fully and
  immediately payable or distributable and the restrictions thereon shall
  lapse. At the Effective Time, each holder of a Current Stock Award shall be
  paid in full satisfaction of such Current Stock Award a cash payment in an
  amount in respect thereof equal to the product of (i) the Merger
  Consideration and (ii) the number of shares of Common Stock subject to such
  Current Stock Award, less any income or employment tax withholding required
  under the Code or any provision of state or local law.

      (ii) Each performance award assigned in the 1997 to 1999 performance
    cycle or the 1998 to 2000 performance cycle under the Company's
    Performance Share Plan (collectively the "Deferred Performance Awards")
    shall be awarded assuming a performance level of 100% of the target
    award and shall vest and become payable on the following date (referred
    to herein as the "Vesting Date"): (A) on the third anniversary of the
    Effective Time, provided the executive to whom such award was made has
    been continuously employed, including any leaves of absence authorized
    by the Company, by the Company or an Affiliate of the Company from the
    Effective Time until such date or (B) upon the death or Disability or
    Retirement of the executive, the termination of the executive's
    employment by the Company and its Affiliates without Cause or the
    termination by the executive of his or her employment with the Company
    and its Affiliates for Good Reason, provided such death, Disability,
    Retirement or termination occurs on or after the Effective Time and
    prior to the third anniversary of the Effective Time. On the Vesting
    Date, each holder of a Deferred Performance Award shall be paid in full
    satisfaction of such Deferred Performance Award a cash payment in an
    amount in respect thereof equal to the product of (x) the Merger
    Consideration and (y) the number of shares of Common Stock subject to
    such Deferred Performance Award.

    For purposes of the Merger Agreement, "Disability", "Cause" and "Good
  Reason" shall have the following meanings:

      (i) "Disability" shall mean the executive's physical or mental
    incapacity which (A) would entitle the executive to disability benefits
    under the Company's or Affiliate's long-term disability plan by which
    the executive is covered or (B) as a result of which, in the judgment
    of a physician appointed by the Company, the executive is unable to
    perform the duties of his or her position with the Company and its
    Affiliates for 180 days during any continuous period of 365 days.

      (ii) "Cause" shall mean (A) the executive's conviction of, plea of
    nolo contendere to, or written admission of his commission of, a
    felony, (B) any act by the Executive involving moral turpitude, fraud
    or misrepresentation with respect to his duties for the Company or its
    Affiliates; or (C) gross negligence or willful misconduct on the part
    of the executive in the performance of his or her duties to the Company
    or its Affiliates.

      (iii) "Good Reason" means (A) any termination of employment of the
    executive with the Company and its Affiliates or any resignation from
    employment with the Company and its Affiliates by the executive
    following a reduction in his or her base salary in effect on the
    Effective Time or

                                      27
<PAGE>

    following the Company's material breach of any of its agreements set
    forth in this Section or (B) any other termination of employment of the
    executive with the Company and its Affiliates which is approved in
    writing by the Company.

      (iv) "Retirement" means an executive's termination of employment on
    or after the date he or she attained age 62.

      (iii) At the Effective Time, each restricted stock unit award under
    the SAP letter agreements shall be converted to a right to receive cash
    equal to the product of (i) the Merger Consideration and (ii) the
    number of shares of Common Stock subject to such restricted stock unit
    award. The foregoing amount of cash shall be paid out pursuant to the
    terms of the SAP letter agreement, to the extent that, and at the same
    time as, such restricted stock unit would otherwise, in the absence of
    the transactions contemplated by this Agreement, have been vested and
    paid out.

      (iv) The above provisions shall not operate to duplicate any amounts
    payable to the executive under his or her Key Executive Agreement.

    (e) Prior to the acceptance of the Shares by Purchaser pursuant to the
  Offer, all stock units, share units or stock equivalent units held under
  the Company's deferred compensation plan for directors or held under the
  Agreement to Restore Benefits Reduced by ERISA-Related Limits (the "Company
  Deferred Compensation Plans") (each a "Company Stock Unit") shall be
  converted into an obligation to pay cash with a value equal to the product
  of (i) the Merger Consideration and (ii) the number of shares of Common
  Stock subject to such Company Stock Unit. With respect to the obligation to
  pay cash in respect of the conversion of Company Stock Units under the
  Company Deferred Compensation Plans, the obligation shall be payable or
  distributable in accordance with the terms of the plan or arrangement
  relating to the Company Stock Unit.

    (f) For purposes of calculating the pension benefits payable under the
  Company's 1993 retirement policy for non-employee directors (the
  "Directors' Retirement Policy"), each non-employee director who is serving
  as a member of the Board as of the Effective Date and who has less than
  five years of service as a member of the Board, shall be credited with five
  years of service; provided, however, that each non-employee director as of
  the Effective Date who has at least five years of service as a member of
  the Board, but has less than ten years of service, shall be credited with
  ten years of service. In addition, Parent, the Company and the Subsidiaries
  shall either (i) continue and maintain the Directors' Retirement Policy as
  in effect on the Effective Date until each non-employee director entitled
  to receive a pension benefit calculated thereunder (whether active or
  retired) has received his or her pension benefit, or (ii) purchase or cause
  to be purchased an annuity contract for each such non-employee director
  that provides for the payment of such pension benefit.

    (g) Prior to the acceptance of the Shares by Purchaser pursuant to the
  Offer:

      (i) The Company shall amend or cause to be amended its Employee Stock
    Ownership Plan (the "ESOP") and the trust agreement establishing the
    trust under the ESOP to provide that the net proceeds in the Suspense
    Account (as defined in the ESOP) resulting from the disposition of the
    Shares held in such trust and repayment of the ESOP Loans (as defined
    in the ESOP) will be immediately allocated to Participants' Accounts
    (as defined in the ESOP) using the ratio of the balance of each such
    Participant's Account to the Accounts of all Participants.

      (ii) The Company shall amend or cause to be amended its Profit
    Sharing, Investment and Pay Deferral Plan and the trust agreement
    establishing the trust under such plan to substantially provide that,
    subject to applicable law, (1) the trustee of such trust shall vote
    shares of Common Stock allocated to a participant's account under such
    plan in accordance with the written instructions given by such
    participant; (2) any such shares held in such trust for which the
    trustee receives no such voting instructions shall be voted by the
    trustee in the same ratio as the shares held in the trust for which the
    trustee receives voting instructions; (3) in the event of a tender
    offer or exchange offer for the shares of Common Stock held in such
    trust, the trustee shall tender or exchange the shares of Common Stock
    held in such trust which are allocated to a plan participant's account
    in accordance with written

                                      28
<PAGE>

    instructions given by such participant; and (4) any such shares held in
    such trust for which the trustee receives no such tender or exchange
    instructions shall be tendered or exchanged by the trustee in the same
    ratio as the shares held in the trust for which the trustee receives
    such tender or exchange instructions.

      (iii) The Company shall amend its Retirement Income Plan for Eligible
    Employees to delete Article 20 thereof in its entirety.

      (iv) The Company shall adopt such other amendments to the plans
    referenced above, and any related agreements or instruments, or obtain
    any consents, as are necessary or appropriate to effectuate the
    transactions contemplated by the Merger Agreement.

      The Company and Parent have agreed to cooperate and take all
    reasonable steps to share in advance information to effect the
    transactions described above.

  Agreement to Use Reasonable Best Efforts. Pursuant to the Merger Agreement
and subject to the terms and conditions thereof, the Company, Parent and
Purchaser shall, and shall use their reasonable best efforts to cause their
respective subsidiaries, as applicable, to: (i) make promptly all respective
filings and thereafter make any other required submissions, under the HSR Act
and under Council Regulation (EC) No. 4064/89, as amended, with respect to the
Merger and the transactions contemplated thereby, (ii) use its reasonable best
efforts to take, or cause to be taken, all appropriate action, and to do, or
cause to be done, all things necessary, proper or advisable under applicable
laws and regulations to consummate and make effective the transactions
contemplated by the Merger Agreement, including, without limitation, using all
reasonable efforts to obtain all licenses, permits, consents, waivers,
approvals, authorizations, qualifications and orders of governmental
authorities and parties to contracts with the Company and the Subsidiaries as
are necessary for the consummation of the transactions contemplated by the
Merger Agreement and to fulfill the conditions to the Offer and the Merger and
(iii) not take action (including effecting or agreeing to effect or announcing
an intention or proposal to effect any acquisition, business combination or
other transaction) which could reasonably be expected to impede, interfere
with, prevent, impair or delay the ability of the parties to consummate the
Merger. The parties shall consult and cooperate with each other in connection
with the making of all such filings or submissions, including providing copies
of all such documents to the non-filing or non-submitting party and its
advisors prior to filing or submitting. In case at any time after the
Effective Time any further action is necessary or desirable to carry out the
purposes of this Agreement, the proper officers and directors of each party to
the Merger Agreement shall use their reasonable best efforts to take all such
action.

  Each of Parent and Purchaser shall use its best efforts to defend through
litigation on the merits any claim asserted in court by any party in order to
avoid the entry of, or to have vacated or terminated, any decree, order, or
judgment that would restrain or prevent the consummation of the Offer by
December 31, 1999.

  Representations and Warranties. In the Merger Agreement, the Company has
made customary representations and warranties to Parent and Purchaser with
respect to, among other things, its organization, corporate authority, capital
structure, financial statements, public filings, litigation, net debt of its
two principal joint ventures, compliance with applicable laws, consent and
approvals, employee benefit plans, brokers' or finders' fees, state takeover
statutes, voting requirements, taxes, intellectual property, Year 2000
compliance and the absence of any material adverse changes in the Company
since March 31, 1999.

  Termination. The Merger Agreement may be terminated and the Merger and other
transactions contemplated thereby may be abandoned at any time prior to the
Effective Time, notwithstanding any requisite approval or adoption by the
stockholders of the Company: (a) by mutual written consent duly authorized by
the boards of directors of Parent, Purchaser and the Company; or (b) by either
Parent, Purchaser, or the Company if (i) the Offer is not completed on or
before December 31, 1999; provided, however, that the right to terminate the
Merger Agreement hereunder (i) shall not be available to any party whose
failure to fulfill any obligation under the Merger Agreement has been the
cause of, or resulted in, the failure to complete the Offer on or before such
date; or (ii) any United States federal or state court of competent
jurisdiction or court of the Republic of France of competent jurisdiction or
other United States federal or state governmental authority or other
governmental

                                      29
<PAGE>

authority of the Republic of France shall have issued an order, decree, ruling
or taken any other action restraining, enjoining or otherwise prohibiting the
Merger and such order, decree, ruling or other action shall have become final
and non-appealable; or (c) by Parent, prior to the acceptance of Shares
pursuant to the Offer, if (i) due to an occurrence or circumstance that would
result in a failure to satisfy any condition set forth Section 14--"Conditions
of the Offer", Purchaser shall have (A) terminated the Offer without having
accepted any Shares for payment thereunder or (B) failed to pay for Shares
pursuant to the Offer by December 31, 1999, unless such failure to accept
Shares for payment or to pay for Shares shall have been caused by or resulted
from the failure of Parent or Purchaser to perform any covenant or agreement
of either of them contained in the Merger Agreement or the breach by Parent or
Purchaser of any representation or warranty of either of them contained in the
Merger Agreement; or (ii) prior to the purchase of Shares pursuant to the
Offer, the Board of Directors or any committee thereof shall have withdrawn or
modified in a manner adverse to Purchaser or Parent its approval or
recommendation of the Offer, the Merger Agreement, the Merger or any other of
the transactions contemplated thereby in order to approve or recommend any
other Acquisition Proposal; by the Company, upon approval of the Board, if
Purchaser shall have (A) failed to commence the Offer within five Business
Days following the date of the Merger Agreement, (B) terminated the Offer
without having accepted any shares for payment thereunder or (C) failed to pay
for Shares pursuant to the Offer by December 31, 1999, unless such failure to
accept Shares for payment or to pay for Shares shall have been caused by or
resulted from the failure of the conditions specified in paragraphs (c) or (d)
of Section 14--"Conditions of the Offer; or (e) by the Company, upon approval
of the Board of Directors, if, prior to the acceptance of Shares by Purchaser
pursuant to the Offer, the Board of Directors shall determine that it is
necessary to do so in accordance with its fiduciary duties to the Company's
stockholders under applicable law as advised by experienced, independent
counsel in order to accept a Superior Proposal; provided, that the Company may
not terminate the Merger Agreement unless and until (i) five Business Days
have elapsed following delivery to Parent of written notice of such
determination of the Company, and during such five Business Day period the
Company has fully cooperated with Parent, with the intent of enabling both
parties to agree to a modification of the terms and conditions of the Merger
Agreement so that the transactions contemplated thereby may be effected, (ii)
at the end of such five Business Day period the Acquisition Proposal continues
to constitute a Superior Proposal and the Board of Directors shall determine
that it is necessary to terminate the Merger Agreement and accept such
Superior Proposal in order to comply with its fiduciary duties to the
Company's stockholders under applicable law as advised by experienced,
independent counsel, and (iii)(x) prior to such termination, Parent has
received the amount described below and (y) concurrently with such termination
the Company enters into a definitive acquisition, merger or similar agreement
to effect the Superior Proposal which agreement with respect to a Superior
Proposal shall provide an opportunity for Parent (and any other person) to
make an additional final bid for the Company and, if such bid would constitute
a Superior Proposal, for the Company to accept such bid.

  Payment of Certain Fees and Expenses Upon Termination. In the event that (i)
Parent terminates the Merger Agreement because prior to the purchase of Shares
pursuant to the Offer, the Board of Directors or any committee thereof shall
have withdrawn or modified in a manner adverse to Purchaser or Parent its
approval or recommendation of the Offer, the Merger Agreement or any of the
transactions contemplated thereby in order to approve or recommend any other
Acquisition Proposal, and (ii) at the time of such termination a third party
shall have publicly made an Acquisition Proposal (whether or not such
Acquisition Proposal shall have been subsequently withdrawn), and (iii) such
Acquisition Proposal is consummated within 12 months after the date of such
termination, then the Company shall pay Parent promptly (but in no event later
than two Business Days after the consummation of the Acquisition Proposal
referred to in clause (ii) above) a fee of $125,000,000 (the "Fee"), which
amount shall be payable in immediately available funds.

  In the event that (i) Parent terminates the Merger Agreement due to the
failure of a condition described in paragraph (c) or (d) of Section 14--
"Conditions of the Offer", (ii) at the time of such termination a third party
shall have publicly made an Acquisition Proposal (whether or not such
Acquisition Proposal shall have been subsequently withdrawn), and (iii) such
Acquisition Proposal is consummated within 12 months after the date of such
termination, then the Company shall pay Parent promptly (but in no event later
than two Business Days after the consummation of the Acquisition Proposal
refereed to in clause (ii) above) the Fee, which shall be paid in immediately
available funds.

                                      30
<PAGE>

  Subject to the immediately preceding paragraph, in the event that Parent
terminates the Merger Agreement because of a failure to satisfy the conditions
specified in paragraphs (c) or (d) of Section 14--"Conditions of the Offer",
then the Company shall pay to Parent promptly after being invoiced by Parent
therefor (but in no event later than two Business Days after receiving such
invoice) an amount equal to Parent's Expenses, which shall be paid in
immediately available funds.

  In the event that the Company terminates the Merger Agreement under the
conditions described in paragraph (e) under the heading "--Merger Agreement--
Termination", then, simultaneously with such termination by the Company, the
Company shall pay to Parent the Fee, which shall be paid in immediately
available funds.

  In the event that the Company terminates the Merger Agreement under the
conditions described in paragraph (d) under the heading "--Merger Agreement--
Termination" and Parent or Purchaser shall have failed to perform or comply
with, in any material respect, any material agreement or covenant of Parent or
Purchaser under the Merger Agreement, then Parent shall pay to the Company
promptly after being invoiced by the Company therefor (but in no event later
than two Business Days after receiving such invoice) an amount equal to the
Company's Expenses, which shall be paid in immediately available funds.

  In the event that any party shall fail to pay the Fee or Expenses when due,
such party, without being relieved of any obligation to pay the Fee or
Expenses as the case may be in full, shall reimburse the other party for the
Expenses actually incurred or accrued by such other party in connection with
the collection under and enforcement of the above obligations, together with
interest on such unpaid Fee or Expenses, commencing on the date that the Fee
or Expenses became due, at a rate equal to the rate of interest publicly
announced by Citibank, N.A., from time to time, in the City of New York, as
such bank's Base Rate.

  "Expenses" shall mean documented and reasonable out-of-pocket fees and
expenses incurred or paid by or on behalf of the party incurring such fees and
expenses in connection with the Offer, Merger or the consummation of the
transactions contemplated by the Merger Agreement, including, but not limited
to, all filing fees, printing fees and reasonable fees and expenses of law
firms, commercial banks, investment banking firms, accountants, experts and
consultants to such party.

Confidentiality Agreement

  The following is a summary of the Confidentiality Agreement, dated as of
April 13, 1999 between Degremont S.A., a wholly owned subsidiary of Parent
("Degremont") and Goldman Sachs, on behalf of the Company (the
"Confidentiality Agreement"). This summary is qualified in its entirety by
reference to the Confidentiality Agreement, a copy of which has been filed
with the Commission as an exhibit to the Schedule 14D-1. The Confidentiality
Agreement can be inspected at, and copies may be obtained from, the same
places and in the manner set forth in Section 7--"Certain Information
Concerning the Company".

  Pursuant to the Confidentiality Agreement, Degremont has agreed, among other
things, (i) to use Evaluation Material (as defined herein) solely for the
purpose of evaluating a possible transaction between Degremont and the Company
and to keep confidential such Evaluation Materials between Degremont and its
advisors, and (ii) not to, and to direct such directors, officers, employees
and representatives of Degremont not to, disclose to any person either the
fact that discussions or negotiations are taking place concerning a possible
transaction between the Company and Degremont or any of the terms, conditions
or other facts with respect to any such possible transaction, including the
status thereof. "Evaluation Material" is any information concerning the
Company (whether prepared by the Company, its advisors or otherwise) furnished
to Degremont by or on behalf of the Company; provided, however that Evaluation
Material does not include information which (i) is already in Degremont's
possession, provided that such information is not known by Degremont to be
subject to another confidentiality agreement with or other obligation of
secrecy to the Company or another party, or (ii) becomes generally available
to the public other than as a result of a disclosure by Degremont or
Degremont's directors, officers, employees, agents or advisors, or (iii)
becomes available to Degremont on a non-confidential basis from a source other
than the Company or its advisors, provided that such source is not known by
Degremont to be bound by a confidentiality agreement with or other obligation
of secrecy to the Company or another party.

                                      31
<PAGE>

  Degremont has also agreed that for a period of three years from the date of
the Confidentiality Agreement, it will not acquire, or assist, advise or
encourage any other persons in acquiring or attempting to acquire, directly or
indirectly, control of the Company (including by way of election of any
directors of the Company) or any of the Company's securities, businesses or
assets unless the Company shall have consented in advance in writing to such
acquisition or attempted acquisition.

Rights Agreement

  The following is a summary description of the Rights Agreement. The summary
is qualified in its entirety by reference to the Rights Agreement and the
amendments thereto which are incorporated herein by reference and copies of
which have been filed with the Commission. The Rights Agreement may be
inspected at, and copies may be obtained from, the same places and in the
manner set forth in Section 7--"Certain Information Concerning the Company".

  On June 20, 1996, the Board of Directors declared a dividend of one
preferred stock purchase right for each outstanding share of Common Stock of
the Company. The dividend was paid to holders of record of the Common Stock on
September 1, 1996, the effective date of the Company's initial public offering
registration statement (the "Record Date"). Each Right entitles the holder
thereof (except as described below) to purchase from the Company one one-
thousandth of a share of the Series C Junior Participating Preferred Stock,
$0.1875 par value (the "Series C Preferred Stock"), of the Company at a price
(the "Purchase Price") of $125.00 per one one-thousandth of a share of Series
C Preferred Stock, subject to adjustment. The terms of the Rights are set
forth in the Stockholders Rights Agreement dated as of June 20, 1996, as
amended (the "Rights Agreement") between the Company and First Chicago, as
Rights Agent (the "Rights Agent"). The Company has amended the Rights
Agreement to render the Rights Agreement inapplicable with respect to the
Offer, the Merger and the other transactions contemplated by the Merger
Agreement. All undefined capitalized terms used in the discussion below are
used as defined in the Rights Agreement.

  The Rights associated with the Common Stock outstanding as of the Record
Date currently are evidenced solely by the stock certificates for such Common
Stock. The Rights will separate from the Common Stock upon the earlier to
occur of (i) 10 days following a public announcement that a person or group of
affiliated or associated persons (an "Acquiring Person") has acquired, or
obtained the right to acquire, beneficial ownership of 15% or more of the
outstanding shares of Common Stock (the "Shares Acquisition Date") or (ii) 15
business days (or such later date as may be determined by action of the Board
of Directors prior to the time that any person becomes an Acquiring Person)
following the commencement of (or a public announcement of an intention to
make) a tender or exchange offer if, upon consummation thereof, such person or
group would be the beneficial owner of 15% or more of such outstanding shares
of Common Stock (the earlier of such dates being called the "Distribution
Date"), the Rights will be evidenced by the Common Stock certificates,
together with a copy of the Summary of Rights Plan filed with the Commission
on Form 8-A (the "Summary of Rights Plan") and not by separate certificates.

  The Rights Agreement also provides that, until the Distribution Date, the
Rights will be transferred with and only with the Common Stock. Until the
Distribution Date (or earlier redemption, expiration or termination of the
Rights), the transfer of any certificates for Common Stock, with or without a
copy of the Summary of Rights Plan, will also constitute the transfer of the
Rights associated with the Common Stock represented by such certificates. As
soon as practicable following the Distribution Date, separate certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of
record of the Common Stock as of the close of business on the Distribution
Date and, thereafter, such separate Right Certificates alone will evidence the
Rights.

  The Rights are not exercisable until the Distribution Date and will expire
at the earliest of (i) August 31, 2006 (the "Final Expiration Date"), (ii) the
redemption of the Rights by the Company as described below and (iii) the
exchange of all Rights for Common Stock as described below.


                                      32
<PAGE>

  In the event that any person (other than the Company, its affiliates or any
person receiving newly-issued shares of Common Stock directly from the
Company) becomes the beneficial owner of 15% or more of the then-outstanding
shares of Common Stock, each holder of a Right will thereafter have the right
to receive, upon exercise at the then-current Exercise Price of the Right,
Common Stock (or, in certain circumstances, cash, property or other securities
of the Company) having a value equal to two times the exercise price of the
Right. The Rights Agreement contains an exemption for any issuance of Common
Stock by the Company directly to any person (for example, in a private
placement or an acquisition by the Company in which Common Stock is used as
consideration), even if that person would become the beneficial owner of 15%
or more of the Common Stock, provided that such person does not acquire any
additional shares of Common Stock.

  In the event that, at any time following the Shares Acquisition Date, the
Company is acquired in a merger or other business combination transaction or
50% or more of the Company's assets or earning power are sold, proper
provision will be made so that each holder of a Right will thereafter have the
right to receive, upon exercise at the then-current Exercise Price of the
Right, common stock of the acquiring or surviving company having a value equal
to two times the exercise price of the Right.

  Notwithstanding the foregoing, following the occurrence of any of the events
set forth in the preceding two paragraphs (the "Triggering Events"), any
Rights that are, or (under certain circumstances specified in the Rights
Agreement) were, beneficially owned by any Acquiring Person will immediately
become null and void.

  The Exercise Price payable, and the number of shares of Series C Preferred
Stock or other securities or property issuable, upon exercise of the Rights,
are subject to adjustment from time to time to prevent dilution, among other
circumstances, in the event of a stock dividend on, or a subdivision, split,
combination, consolidation or reclassification of, the Series C Preferred
Stock or the Common Stock, or a reverse split of the outstanding shares of
Series C Preferred Stock or the Common Stock.

  At any time after the acquisition by a person or group of affiliated or
associated persons of beneficial ownership of 15% or more of the outstanding
Common Stock and prior to the acquisition by such person or group of 50% or
more of the outstanding Common Stock, the Board of Directors may exchange the
Rights (other than Rights owned by such person or group, which have become
void), in whole or in part, at an exchange ratio of one share of Common Stock
per Right (subject to adjustment).

  With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
the Purchase Price. The Company will not be required to issue fractional
shares of Series C Preferred Stock or Common Stock (other than fractions in
multiples of one one-thousandth of a share of Series C Preferred Stock) and,
in lieu thereof, an adjustment in cash may be made based on the market price
of the Series C Preferred Stock or Common Stock on the last trading date prior
to the date of exercise.

  At any time after the date of the Rights Agreement until the time that a
person becomes an Acquiring Person, the Board of Directors may redeem the
Rights in whole, but not in part, at a price of $0.01 per Right (the
"Redemption Price"), which may (at the option of the Company) be paid in cash,
shares of Common Stock or other consideration deemed appropriate by the Board
of Directors. Upon the effectiveness of any action of the Board of Directors
ordering redemption of the Rights, the Rights will terminate and the only
right of the holders of Rights will be to receive the Redemption Price.

  Until a Right is exercised, the holder thereof, as such, will have no rights
as a shareholder of the Company, including, without limitation, the right to
vote or to receive dividends.

  The provisions of the Rights Agreement may be amended by the Company, except
that any amendment adopted after the time that a person becomes an Acquiring
Person may not adversely affect the interests of holders of Rights.

  As of May 31, 1996, there were 66,209,193 shares of Common Stock
outstanding. In addition, 200,000 shares of Series C Preferred Stock are
reserved for issuance in the event of an exercise of the Rights.

                                      33
<PAGE>

  The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire the Company
without conditioning the offer on the Rights being redeemed or a substantial
number of Rights being acquired, and under certain circumstances the Rights
beneficially owned by such a person or group may become void. The Rights
should not interfere with the Merger because the Board of Directors has taken
all action necessary to redeem all of the then-outstanding Rights at the
Redemption Price and to exclude Parent and Purchaser from the definition of
"Acquiring Person" in the Rights Plan so that the Merger and the related
Transactions will not constitute a Triggering Event.

Employment Agreements

  The following is a summary description of the Employment Letters executed by
the respective Executive. The summary is qualified in its entirety by
reference to the Form of Agreement as to Terms of Employment which is
incorporated herein by reference and a copy of which has been filed with the
Commission as an exhibit to the Schedule 14D-1. The Form of Agreement as to
Terms of Employment may be inspected at, and copies may be obtained from, the
same places as set forth in Section 7--"Certain Information Concerning the
Company".

  In connection with the Merger Agreement, Degremont, a wholly owned
subsidiary of Parent, Purchaser and each of Messrs. George M. Brannon, III,
William E. Buchholz, John T. Burns, Michael E. Kahler, James F. Lambe, Edward
J. Mooney, Stephen D. Newlin, William J. Roe, and W. Steven Weeber (each an
"Executive") entered into a letter agreement (each an "Employment Letter")
relating to the terms of their employment following the consummation of the
Merger. The Employment Letters contain identical terms, except as noted below.
The Employment Letters provide for the Company to offer the Executive
employment with the Company, and each Executive to accept such employment on
the terms and conditions described below. The offer of employment is
conditioned upon the completion of the Merger and shall become effective at
the Effective Time. The parties have agreed to enter into definitive
employment agreements, and it is anticipated that such agreements will be
between each Executive and the Company.

  Each Employment Letter: (i) provides a three year employment period, with a
one-year evergreen after the three year period and a six-month notice
provision for non-renewal; and (ii) includes a retention payment ("Retention
Payment") equal to two times the Executive's salary plus regular target bonus
(as of June 22, 1999) payable in cash, if the Executive is employed by the
Company for three years from the date of the change of control.

  Each of the Employment Letters provides for various severance payments,
depending on the circumstances under which an Executive's employment is
terminated. Executives will receive higher severance payments if their
employment is terminated "without cause" by the Company or for "good reason"
by the Executive. Each Employment Letter also provides for a full golden
parachute excise tax gross-up (excluding the Retention Payment) for future
changes in control, but only in the event of termination "without cause" by
the Company or resignation for "good reason" by the Executive.

  Each Employment Letter also includes a provision for (i) non-competition
with the Company and non-solicitation of customers and employees during
employment and for two years thereafter and (ii) a perpetual agreement for
non-disclosure, non-disparagement and availability for litigation support.

  Each Employment Letter also provides for a settlement of existing key
executives agreements with each Executive through: (i) a payment of three
times the sum of the Executive's current base salary and regular management
incentive program ("MIP") bonus, to be paid at the Effective Time, (ii) three
times a supplemental MIP bonus and, in addition, the outstanding 1997 and 1998
Performance Share Awards to be paid at the end of three years, with interest,
if the Executive is still employed by the Company or in the event of the
Executive's prior death, disability, or termination by the Company without
"cause" or by the Executive for "good reason" or retirement on or after age
62, assuming in each case a performance level of 100% of the target award;
(iii) payments of outstanding restricted stock awards including the
outstanding Performance Share Plan awards, stock options, and payment to be
paid at the Effective Time with respect to the change in control payments
(except for the Retention Bonus) made by reason of the Merger Agreement.

                                      34
<PAGE>

  12. Dividends and Distributions. As described above, the Merger Agreement
provides that the Company shall not, and shall not permit any of its
Subsidiaries to, without the prior written consent of Parent: (i) declare, set
aside or pay any dividends on, or make any other actual, constructive or
deemed distributions in respect of, any of its capital stock, or otherwise
make any payments to stockholders of the Company in their capacity as such,
other than dividends payable to the Company declared by any of the Company's
subsidiaries, (ii) split, combine, subdivide or reclassify any of its capital
stock or make any other actual, constructive or deemed distribution in respect
of any shares of its capital stock or (iii) redeem, purchase or otherwise
acquire any of its outstanding securities, other than pursuant to existing
agreements requiring the Company to repurchase or acquire any shares of its
capital stock (provided that such repurchase or acquisition is in accordance
with the terms of the Merger Agreement as in effect on June 27, 1999).

  Pursuant to the terms of the Merger Agreement, the Company is prohibited
from taking any of the actions described in the preceding paragraphs except as
permitted, required or specifically contemplated by the Merger Agreement and
nothing herein shall constitute a waiver by Parent or Purchaser of any of its
rights under the Merger Agreement or a limitation of remedies available to
Parent or Purchaser for any breach of the Merger Agreement, including
termination thereof.

  13. Effect of the Offer on the Market for the Common Stock; Exchange Act
Registration.

  Market for Shares. The purchase of Shares pursuant to the Offer will reduce
the number of Shares that might otherwise trade publicly and could adversely
affect the liquidity and market value of the remaining Shares held by the
public.

  Stock Quotation. The Common Stock is traded primarily on the New York Stock
Exchange. According to published guidelines of the New York Stock Exchange,
the Common Stock might no longer be eligible for quotation on the New York
Stock Exchange if, among other things, the number of Shares publicly held was
less than 1,100,000, there were fewer than 2,000 holders of round lots, the
aggregate market value of the publicly held Shares was less than $40,000,000,
net tangible assets were less than $40,000,000 and there were fewer than two
registered and active market makers for the Common Stock. Common Stock held
directly or indirectly by directors, officers or beneficial owners of more
than 10 percent of the Common Stock are not considered as being publicly held
for this purpose. According to the Company, as of June 30, 1999, there were
4,614 Holders of record of Common Stock (not including beneficial holders of
Common Stock in street name), and as of June 25, 1999, there were 66,263,894
shares of Common Stock outstanding.

  If the Common Stock were to cease to be quoted on the New York Stock
Exchange, the market for the Common Stock could be adversely affected. It is
possible that the Common Stock would be traded or quoted on other securities
exchanges or in the over-the-counter market, and that price quotations would
be reported by such exchanges, or through Nasdaq or other sources. The extent
of the public market for the Common Stock and the availability of such
quotations would, however, depend upon the number of stockholders and/or the
aggregate market value of the Common Stock remaining at such time, the
interest in maintaining a market in the Common Stock on the part of securities
firms, the possible termination of registration of the shares under the
Exchange Act and other factors.

  Exchange Act Registration. The Common Stock is currently registered under
the Exchange Act. Such registration under the Exchange Act may be terminated
upon application of the Company to the Commission if the Common Stock is
neither listed on a national securities exchange nor held by 300 or more
holders of record. Termination of registration under the Exchange Act would
substantially reduce the information required to be furnished by the Company
to its stockholders and to the Commission and would make certain provisions of
the Exchange Act no longer applicable to the Company, such as the short-swing
profit recovery provisions of Section 16(b) of the Exchange Act, the
requirement of furnishing a proxy statement pursuant to Section 14(a) of the
Exchange Act in connection with stockholders' meetings, the related
requirement of furnishing an annual report to stockholders and the
requirements of Rule 13e-3 under the Exchange Act with respect to "going
private" transactions. Furthermore, the ability of "affiliates" of the Company
and persons holding "restricted securities"

                                      35
<PAGE>

of the Company to dispose of such securities pursuant to Rule 144 promulgated
under the Securities Act of 1933, as amended, may be impaired or eliminated.
Purchaser intends to seek to cause the Company to apply for termination of
registration of the Common Stock under the Exchange Act as soon after the
completion of the Offer as the requirements for such termination are met.

  If registration of the Common Stock is not terminated prior to the Merger,
then the Common Stock will be delisted from all stock exchanges and the
registration of the Common Stock under the Exchange Act will be terminated
following the consummation of the Merger.

  Margin Regulations. The Shares are currently "margin securities," as such
term is defined under the regulations of the Federal Reserve Board, which has
the effect, among other things, of allowing brokers to extend credit on the
collateral of the Common Stock. Depending upon factors similar to those
described above regarding listing and market quotations, it is possible that,
following the Offer, the Common Stock would no longer constitute "margin
securities" for the purposes of the margin regulations of the Federal Reserve
Board and therefore could no longer be used as collateral for loans made by
brokers. In any event, the Common Stock will cease to be "margin securities"
if registration of the Common Stock under the Exchange Act is terminated.

  14. Conditions of the Offer. Notwithstanding any other provision of the
Offer, Purchaser shall not be required to accept for payment or pay for any
Shares tendered pursuant to the Offer, and on or after the initial scheduled
expiration date of the Offer may amend the Offer and may postpone the
acceptance of and payment for Shares tendered, if (i) the Minimum Condition
shall not have been satisfied, (ii) any applicable waiting period under the
HSR Act shall not have expired or been terminated prior to the expiration of
the Offer, (iii) the Commission of the European Union shall not have approved
the Transactions under Regulation (EC) No. 4064/89, as amended, of the Council
of the European Union. In addition, notwithstanding any other term of the
Offer, Purchaser shall not be required to accept for payment or pay for any
Shares tendered pursuant to the Offer, and, at any time on or after the date
of the Merger Agreement and prior to the acceptance of Shares for payment, may
terminate or amend the Offer and may postpone the acceptance for payment of
and payment for Shares tendered if any of the following conditions shall
exist:

    (a) there shall be instituted or pending any action or proceeding by any
  United States federal or state court or Republic of France court or United
  States or Republic of France governmental, administrative or regulatory
  authority or agency, in each case of competent jurisdiction over the
  Company or a Material Subsidiary (as defined in the Merger Agreement) (i)
  challenging or seeking to make illegal or otherwise directly or indirectly
  restrain, prohibit or make materially more costly the Offer or the Merger,
  (ii) seeking to prohibit or materially limit the ownership or operation by
  Parent of all or any material portion of the business or assets of the
  Company and its subsidiaries taken as a whole or to compel Parent to
  dispose of or hold separately all or any material portion of the business
  or assets of Parent and its subsidiaries taken as a whole or the Company
  and its Subsidiaries taken as a whole or seeking to impose any material
  limitations on the ability of Parent or the Company to conduct its business
  or own any material parties of the business or assets of Parent and its
  subsidiaries taken as a whole or the Company and its Subsidiaries taken as
  a whole in each case as a result of the transactions contemplated by the
  Merger Agreement, (iii) seeking to impose limitations on the ability of
  Parent or Purchaser to exercise effectively full rights of ownership of any
  shares, including, without limitation, the right to vote any such Shares
  acquired or owned by Purchaser or Parent on all matters properly presented
  to the Company's stockholders, including without limitation, the approval
  and adoption of the Merger Agreement and the transactions contemplated
  thereby, or (iv) seeking to require divestiture by Parent or Purchaser of
  any Shares;

    (b) there shall be any action taken or any statute, rule, regulation,
  legislation, judgment, order or injunction, enacted, enforced, promulgated,
  amended or issued and applicable to (i) Parent, Purchaser, the Company or
  any subsidiary of any of them or (ii) the Offer or the Merger, by any
  United States federal or state or Republic of France legislative body,
  court, government or governmental, administrative or regulatory authority
  or agency, other than the routine application of the waiting period
  provisions of the HSR Act to the Offer or to the Merger, which would
  reasonably be expected to directly or indirectly, result in any of the
  consequences referred to in clauses (i) through (iv) in the immediately
  preceding paragraph;

                                      36
<PAGE>

    (c) any representation or warranty of the Company in the Merger Agreement
  shall not be true and correct so as to have a Material Adverse Effect (as
  defined in the Merger Agreement), in each case as if such representation or
  warranty was made as of such time on or after the date of the Merger
  Agreement (except for representations and warranties made as of a specific
  date which shall be true and correct as of such date so as not to have a
  Material Adverse Effect); provided, however, that for purposes of this
  paragraph (c), if any representation or warranty of the Company in the
  Merger Agreement is qualified in any respect by materiality or the words
  "Material Adverse Effect", such materiality or Material Adverse Effect
  qualification shall be ignored for purposes of this paragraph (c);

    (d) the Company shall have failed to perform, or comply with, any
  agreement or covenant of the Company to be performed or complied with by it
  under the Merger Agreement, which failure has a Material Adverse Effect;

    (e) there shall have occurred (i) any general suspension of trading in,
  or limitation on prices for, securities on the New York Stock Exchange,
  Inc. and such suspension shall continue for six consecutive Business Days
  (excluding any coordinated trading halt triggered solely as a result of a
  specified decrease in a market index), (ii) a declaration of a banking
  moratorium or any suspension of payments in respect of banks in the United
  States or France and such moratorium shall continue for six consecutive
  Business Days, (iii) any material limitation (whether or not mandatory) by
  any United States federal or French governmental authority or agency on the
  extension of credit by banks or other lending institutions and such
  limitations shall continue for six consecutive Business Days;

    (f) the Merger Agreement shall have been terminated in accordance with
  its terms; or

    (g) Purchaser and the Company shall have agreed that Purchaser shall
  terminate the Offer or postpone the acceptance for payment of or payment
  for Shares thereunder;

  provided that, with respect to paragraphs (a), (b), (c) and (d) above,
  Purchaser shall give the Company advance written notice of any intention by
  Purchaser to assert the nonsatisfaction of any of the conditions set forth
  in such paragraphs (a), (b), (c) or (d),which notice shall describe in
  reasonable detail the basis for the belief that any such condition has not
  been satisfied; and, provided further that (i) in the event of any action,
  proceeding, judgment, order or injunction contemplated by such paragraphs
  (a) or (b), Purchaser shall not terminate the Offer under such paragraphs
  (a) or (b), nor exercise any related rights to terminate this Agreement,
  unless and until such action, proceeding, judgment, order or injunction
  shall have become final and nonappealable and (ii) if any breach or failure
  to perform contemplated by any of such paragraphs (c) and (d) is capable of
  being cured through the exercise by the Company of its reasonable best
  efforts and for so long as the Company continues to use such reasonable
  best efforts to cure such breach of failure to perform, Purchaser shall not
  terminate the Offer under such paragraphs (c) or (d) or exercise any
  related right to terminate this Agreement, in either case for a period not
  to exceed 10 Business Days.

  The foregoing conditions are for the benefit of Parent and Purchaser and may
be asserted by Purchaser or Parent regardless of the circumstances giving rise
to any such condition or, subject to the terms of the Merger Agreement, may be
waived by Purchaser or Parent, in whole or in part, at any time and from time
to time in their discretion. The failure by Parent or Purchaser at any time to
exercise any of the foregoing rights shall not be deemed a waiver of any such
right; the waiver of any such right with respect to particular facts and other
circumstances shall not be deemed a waiver with respect to any other facts and
circumstances, and each such right shall be deemed an ongoing right that may
be asserted at any time and from time to time.

  15. Certain Legal Matters; Regulatory Approvals.

  General. Except as otherwise disclosed herein, neither Parent nor Purchaser
is aware of (i) any license or regulatory permit that appears to be material
to the business of the Company and its subsidiaries, taken as a whole, that
might be adversely affected by the acquisition of Shares by Purchaser pursuant
to the Offer, Merger or otherwise or (ii) any approval or other action by any
governmental, administrative or regulatory agency or authority, domestic or
foreign, that would be required for the acquisition or ownership of Shares by
Purchaser as

                                      37
<PAGE>

contemplated herein. Should any such approval or other action be required,
Purchaser currently contemplates that it would seek such approval or action.
Purchaser's obligation under the Offer to accept for payment and pay for
Shares is subject to certain conditions. See Section 14--"Conditions of the
Offer". While, except as described in this Offer to Purchase, Purchaser does
not currently intend to delay the acceptance for payment of Shares tendered
pursuant to the Offer pending the outcome of any such matter, there can be no
assurance that any such approval or action, if needed, would be obtained or
would be obtained without substantial conditions or that adverse consequences
might not result to the business of the Company, Parent or Purchaser or that
certain parts of the businesses of the Company, Parent or Purchaser might not
have to be disposed of in the event that such approvals were not obtained or
any other actions were not taken.

  State Takeover Laws. The Company is incorporated under the laws of the State
of Delaware. In general, Section 203 of the DGCL prevents an "interested
stockholder" (generally a person who owns or has the right to acquire 15% or
more of a corporation's outstanding voting stock, or an affiliate or associate
thereof) from engaging in a "business combination" (defined to include mergers
and certain other transactions) with a Delaware corporation for a period of
three years following the date such person became an interested stockholder
unless, among other things, prior to the date the interested stockholder
became an interested stockholder, the board of directors of the corporation
approved either the business combination or the transaction in which the
interested stockholder became an interested stockholder. The Company has
represented to Parent and Purchaser in the Merger Agreement that the Board of
Directors of the Company has taken all action (including appropriate approvals
of the Board of Directors of the Company) necessary to exempt Parent, its
subsidiaries, their affiliates, the Merger, the Merger Agreement and the
transactions contemplated thereby from Section 203 of the DGCL.

  A number of other states have adopted laws and regulations applicable to
attempts to acquire securities of corporations which are incorporated, or have
substantial assets, stockholders, principal executive offices or principal
places of business, or whose business operations otherwise have substantial
economic effects, in such states. In Edgar v. MITE Corp., the Supreme Court of
the United States invalidated on constitutional grounds the Illinois Business
Takeover Statute, which, as a matter of state securities law, made takeovers
of corporations meeting certain requirements more difficult. However, in 1987
in CTS Corp. v. Dynamics Corp. of America, the Supreme Court held that the
State of Indiana may, as a matter of corporate law and, in particular, with
respect to those aspects of corporate law concerning corporate governance,
constitutionally disqualify a potential acquirer from voting on the affairs of
a target corporation without the prior approval of the remaining stockholders.
The state law before the Supreme Court was by its terms applicable only to
corporations that had a substantial number of holders in the state and were
incorporated there.

  The Company, directly or through subsidiaries, conducts business in a number
of states throughout the United States, some of which have enacted takeover
laws. Based on representations made by the Company in the Merger Agreement,
Purchaser does not believe that any state takeover statutes apply to the
Offer. Neither Parent nor Purchaser has currently complied with any state
takeover statute or regulation. Purchaser reserves the right to challenge the
applicability or validity of any state law purportedly applicable to the Offer
or the Merger and nothing in this Offer to Purchase or any action taken in
connection with the Offer or the Merger is intended as a waiver of such right.
In the event it is asserted that one or more state takeover laws is applicable
to the Offer or the Merger, and an appropriate court does not determine that
it is inapplicable or invalid as applied to the Offer or the Merger, Purchaser
might be required to file certain information with, or receive approvals from,
the relevant state authorities. In addition, if enjoined, Purchaser might be
unable to accept for payment any Shares tendered pursuant to the Offer or be
delayed in continuing or consummating the Offer and the Merger. In such case,
Purchaser may not be obligated to accept for payment any Common Stock
tendered. See Section 14--"Conditions of the Offer".

  Appraisal Rights. No appraisal rights are available to Holders in connection
with the Offer.

  However, if the Merger is consummated, a Holder will have certain rights
under Section 262 of the DGCL to dissent and demand appraisal of, and payment
in cash for the fair value of, such Holder's Shares. Those rights, if the
statutory procedures are complied with, could lead to a judicial determination
of the fair value (excluding

                                      38
<PAGE>

any value arising from the Merger) required to be paid in cash to dissenting
stockholders for their Shares. Any judicial determination of the fair value of
the Shares could be based upon considerations other than or in addition to the
Offer Price and the market value of the Shares, including asset values and the
investment value of such Shares. The value so determined could be more or less
than the Offer Price. Failure to follow the steps required by Section 262 of
the DGCL for perfecting appraisal rights may result in the loss of those
rights.

  If a Holder who demands appraisal under Section 262 of the DGCL fails to
perfect, or effectively withdraws or loses, its right to appraisal, as
provided in the DGCL, the Shares of that Holder will be converted into the
Merger Consideration in accordance with the Merger Agreement. A Holder may
withdraw his demand for appraisal by delivering to Purchaser a written notice
withdrawing such demand for appraisal and accepting of the Merger.

  The foregoing summary of the rights of objecting Holders does not purport to
be a complete statement of the procedures to be followed by Holders desiring
to exercise any available appraisal rights.

  The preservation and exercise of appraisal rights require strict adherence
to the applicable provisions of Delaware law. The provisions of Section 262 of
the DGCL are complex and technical in nature. Holders desiring to exercise
their appraisal rights may wish to consult counsel, since the failure to
comply strictly with these provisions will result in the loss of their
appraisal rights.

  Going Private Transactions. Rule 13e-3 under the Exchange Act is applicable
to certain "going private" transactions. Purchaser does not believe that Rule
13e-3 will be applicable to the Merger, unless, among other things, the Merger
is completed more than one year after termination of the Offer. If applicable,
Rule 13e-3 would require, among other things, that certain financial
information regarding the Company and certain information regarding the
fairness of the Merger and the consideration offered to stockholders of the
Company therein be filed with the Commission and disclosed to stockholders of
the Company prior to consummation of the Merger.

  Regulatory Approvals.

  (a) Antitrust--US. Under the HSR Act and the rules that have been
promulgated thereunder by the Federal Trade Commission ("FTC"), certain
mergers and acquisitions may not be consummated unless certain information has
been furnished to the Antitrust Division of the Department of Justice (the
"Antitrust Division") and the FTC and certain waiting period requirements have
been satisfied. The acquisition of Shares by Purchaser pursuant to the Offer
is subject to the HSR Act requirements.

  Under the provisions of the HSR Act applicable to the purchase of Shares
pursuant to the Offer, such purchase may not be made until the expiration of a
15-calendar day waiting period following the required filing of a Notification
and Report Form under the HSR Act by Parent, which Parent will submit as soon
as reasonably possible. Accordingly, the waiting period under the HSR Act will
expire at 11:59 P.M., New York City time, on the fifteenth calendar day
following filing of the Notification and Report Form by Parent, unless early
termination of the waiting period is granted or Parent receives a request for
additional information or documentary material prior thereto. If either the
FTC or the Antitrust Division were to request additional information or
documentary material from Parent prior to the expiration of the 15-day waiting
period, the waiting period would be extended and would expire at 11:59 P.M.,
New York City time, on the tenth calendar day after the date of substantial
compliance by Parent with such request. Thereafter, the waiting period could
be extended only by court order or by consent of Parent. If the acquisition of
Shares is delayed pursuant to a request by the FTC or the Antitrust Division
for additional information or documentary material pursuant to the HSR Act,
the purchase of and payment for Shares pursuant to the Offer will be deferred
until 10 days after the request is substantially complied with unless the
waiting period is terminated sooner by the FTC or the Antitrust Division (and
assuming all of the other conditions to the Offer have been satisfied or
waived). See Section 2--"Acceptance for Payment and Payment for Shares". Only
one extension of such waiting period pursuant to a request for additional
information or documentary material is authorized by the rules promulgated
under the HSR Act, except by court order or by

                                      39
<PAGE>

consent. Although the Company is required to file certain information and
documentary material with the Antitrust Division and the FTC in connection
with the Offer, neither the Company's failure to make such filings nor a
request to the Company from the Antitrust Division or the FTC for additional
information or documentary material will extend the waiting period. However,
if the Antitrust Division or the FTC raises substantive issues in connection
with a proposed transaction, the parties frequently engage in negotiations
with the relevant governmental agency concerning possible means of addressing
these issues and may agree to delay consummation of the transaction while such
negotiations continue.

  The Antitrust Division and the FTC frequently scrutinize the legality under
the antitrust laws of transactions such as the proposed acquisition of Shares
by Purchaser pursuant to the Offer. At any time before or after Purchaser's
purchase of Shares, either the Antitrust Division or the FTC could take such
action under the antitrust laws as it deems necessary or desirable in the
public interest, including seeking to enjoin the acquisition of Shares
pursuant to the Offer or seeking divestiture of Shares acquired by Purchaser
or divestiture of substantial assets of Parent, the Company or any of their
respective subsidiaries. State attorneys general may also bring legal action
under the antitrust laws, and private parties may bring such action under
certain circumstances. Parent and Purchaser believe that the acquisition of
Shares by Purchaser will not violate the antitrust laws. Nevertheless, there
can be no assurance that a challenge to the Offer on antitrust grounds will
not be made or, if a challenge is made, what the result will be. See Section
14--"Conditions of the Offer" for certain conditions to the Offer, including
conditions with respect to litigation and certain governmental actions.

  (b) Antitrust--EC. The EC Merger Regulation (Council Regulation No. 4064/89
of December 21, 1989, as amended) requires notification to the European
Commission, within seven days of the conclusion of an agreement or
commencement of an offer to acquire a controlling interest or the commencement
of a cash tender offer therefor, of all concentrations between companies which
are deemed to have a "Community dimension" because they exceed certain global
and European turnover thresholds. Such concentrations may not be consummated
until the European Commission, acting within fixed deadlines, approves them as
being "compatible with the Common Market". A concentration is compatible with
the Common Market if it does not create or strengthen a dominant position as a
result of which effective competition would be significantly impeded in the
European Economic Area (the "EEA"), or in a substantial part of it.

  The European Commission has exclusive competence for approving or
prohibiting concentrations with a Community dimension--however, it may, upon
request, refer the case to the national antitrust authority of a particular
member state if the concentration has a specific effect on the territory of
the requesting member state.

  The notification involves the disclosure to the European Commission of
detailed information, especially regarding the structure of the relevant
markets and the parties' competitive position. Upon receipt of a notification,
the European Commission conducts a preliminary review with a maximum duration
of one month from notification, which may be extended to six weeks in certain
circumstances. This preliminary review concludes with a decision either to
approve the notified concentration (with or without conditions) or to initiate
an in-depth investigation if the concentration raises serious doubts as to its
compatibility with the Common Market. Such an in-depth investigation has a
maximum duration of four months, and must end with a European Commission
decision either approving the concentration (with or without conditions) or
prohibiting it. If the European Commission raises substantive issues in
connection with the proposed concentration, the parties may negotiate with the
European Commission to find a solution, which may take the form of an
undertaking to make structural modifications to the entity resulting from the
concentration on conditions, and within a timeframe, agreed with the European
Commission.

  Parent and the Company, including their respective affiliates, each conducts
substantial operations within the EEA and satisfies the applicable turnover
thresholds, with the result that the acquisition of Common Stock will amount
to a concentration with a Community dimension and, therefore, be subject to
the requirement of notification to, and approval by, the European Commission.

  Parent and Purchaser believe that the concentration effected by the
acquisition of the Common Stock by Purchaser will be considered to be
compatible with the Common Market, and approved by the European Commission
during the preliminary review phase. However, it cannot be ruled out that the
European Commission

                                      40
<PAGE>

might seek to require structural undertakings as a condition to its approval,
and/or to open a second phase investigation to examine serious doubts
regarding the concentration's compatibility with the Common Market.

  16. Fees and Expenses. Except as set forth below, neither Parent nor
Purchaser will pay any fees or commissions to any broker, dealer or other
person for soliciting tenders of Shares pursuant to the Offer.

  Parent and Purchaser have engaged J.P. Morgan as the Dealer Manager in
connection with the Offer, and as financial advisor in connection with
Parent's proposed acquisition of the Company. Parent and Degremont have agreed
to pay J.P. Morgan an engagement fee of $100,000, a retainer fee of $50,000
per month, an announcement fee of $1,000,000 and, upon consummation of the
Offer, a success fee of $10,500,000 (less any amount of the engagement,
retainer or announcement fees previously paid). Parent and Degremont have also
agreed to reimburse J.P. Morgan for all reasonable expenses, and to indemnify
J.P. Morgan and certain other persons against certain liabilities in
connection with the Offer, including certain liabilities under the federal
securities laws.

  Purchaser and Parent have also retained First Chicago as the Depositary. The
Depositary has not been retained to make solicitations or recommendations in
its role as Depositary. The Depositary will receive reasonable and customary
compensation for its services, will be reimbursed for certain reasonable out-
of-pocket expenses and will be indemnified against certain liabilities and
expenses in connection therewith, including certain liabilities under the
United States federal securities laws.

  In addition, Purchaser and Parent have retained Morrow & Co., Inc. to act as
the Information Agent in connection with the Offer. The Information Agent will
receive reasonable and customary compensation for its services, will be
reimbursed for certain reasonable out-of-pocket expenses and will be
indemnified against certain liabilities and expenses in connection therewith,
including certain liabilities under the United States federal securities laws.

  Brokers, dealers, commercial banks and trust companies will be reimbursed by
Purchaser for customary mailing and handling expenses incurred by them in
forwarding offering material to their customers.

  17. Miscellaneous. Purchaser is not aware of any jurisdiction where the
making of the Offer is prohibited by any administrative or judicial action
pursuant to any valid state statute. If Purchaser becomes aware of any valid
state statute prohibiting the making of the Offer or the acceptance of Shares
pursuant thereto, Purchaser will make a good faith effort to comply with such
state statute or seek to have such statute declared inapplicable to the Offer.
If, after such good faith effort, Purchaser cannot comply with any such state
statute, the Offer will not be made to (and tenders will not be accepted from
or on behalf of) the Holders in such state. In any jurisdiction where the
securities, blue sky or other laws require the Offer to be made by a licensed
broker or dealer, the Offer shall be deemed to be made on behalf of Purchaser
by the Dealer Manager or one or more registered brokers or dealers which are
licensed under the laws of such jurisdiction.

  No person has been authorized to give any information or make any
representation on behalf of Parent or Purchaser not contained in this Offer to
Purchase or in the Letter of Transmittal and, if given or made, such
information or representation must not be relied upon as having been
authorized.

  Parent and Purchaser have filed with the Commission the Schedule 14D-1,
together with exhibits, pursuant to Section 14(d)(1) of the Exchange Act and
Rule 14d-3 promulgated thereunder, furnishing certain additional information
with respect to the Offer, and may file amendments thereto. The Schedule 14D-1
and any amendments thereto, including exhibits, may be inspected at, and
copies may be obtained from, the same places and in the manner set forth in
Section 7--"Certain Information Concerning the Company" (except that they will
not be available at the regional offices of the Commission).

                                          H2O Acquisition Co.

July 1, 1999

                                      41
<PAGE>

                                  SCHEDULE I

        INFORMATION CONCERNING THE DIRECTORS AND EXECUTIVE OFFICERS OF
                SUEZ LYONNAISE DES EAUX AND H2O ACQUISITION CO.

1. SUPERVISORY BOARD AND EXECUTIVE OFFICERS OF SUEZ LYONNAISE DES EAUX

  Set forth below is the name, present principal occupation or employment and
material occupations, positions, offices or employments for the past five
years of each member of the Supervisory Board and each executive officer of
Suez Lyonnaise des Eaux ("Parent"). The principal address of Parent and,
unless indicated below, the current business address for each individual
listed below is c/o Suez Lyonnaise des Eaux, 1, rue d'Astorg, 75008 Paris,
France. Telephone: 011-33-1-40-06-64-00. Each such person is, unless indicated
below, a citizen of France.

<TABLE>
<CAPTION>
Name and Current                  Present Principal Occupation or Employment;
Business Address         Age  Material Positions Held During the Past Five Years
- ----------------         ---  --------------------------------------------------
<S>                      <C> <C>
Jerome Monod............  68 Chairman of the Board, Lyonnaise des Eaux (1980-
                             1997); Chairman of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2001).

Jean Guy Gandois........  69 Vice Chairman of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2001); Chairman and CEO,
                             Pechiney (1986-1996); Chairman and CEO, Cockerill
                             Sambre (1987-1999); President, French National
                             Council of Employers (1996-1997).

Gerhard Cromme..........  56 Chairman of the Executive Board, Fried. Krupp AG
                             Hoesch-Krupp (1989-1999); Chairman of the Executive
                             Board, Thyssen Krupp AG (1999-present); Member of
                             the Supervisory Board, Suez Lyonnaise des Eaux
                             (1997-2001). German Citizen.

Etienne Davignon........  67 Chairman, Societe Generale de Belgique (1985-
                             present); Member of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2001). Belgian Citizen.

Paul Desmarais, Jr. ....  44 Chairman of the Board and Co-Chief Executive, Power
                             Corporation of Canada (1998-2001); Director, Power
                             Corporation of Canada (Canada); Member of the
                             Supervisory Board, Suez Lyonnaise des Eaux (1998-
                             2001); Director, PetroFina S.A. (Belgium); Director,
                             Tractebel S.A. (Belgium); Director, Electrafina S.A.
                             (Belgium); Director, GWL Properties Inc. (U.S.A.);
                             Director, First Great-West Life & Annuity Insurance
                             Company (U.S.A.); Director, Great-West Lifeco Inc.
                             (Canada); Director, Gold Circle Insurance Company
                             (Canada); Director, Gesca Ltd. (Canada); Director,
                             La Presse Ltd. (Canada); Director, Les Journaux
                             Trans-Canada (1996) Inc. (Canada); Director and
                             Member of the International Council, INSEAD;
                             Chairman, Canadian Foundation for International
                             Management for INSEAD; Chairman, McGill University
                             Faculty of Management International Advisory Board;
                             Chairman, HEC International Advisory Committee.
                             Canadian Citizen.

Reto Domeniconi.........  62 Member of the Supervisory Board, Suez Lyonnaise des
                             Eaux (1997-2001); Directeur General, Nestle SA
                             (1983-1996). Swiss Citizen.

Lucien Douroux..........  65 Chairman of the Supervisory Board, Credit Agricole
                             Indosuez (1999-present); Member of the Supervisory
                             Board, Suez Lyonnaise des Eaux (1997-2001); Chief
                             Executive Officer, Caisse Nationale de Credit
                             Agricole (1993-1999).
</TABLE>

                                      I-1
<PAGE>

<TABLE>
<CAPTION>
Name and Current                  Present Principal Occupation or Employment;
Business Address         Age  Material Positions Held During the Past Five Years
- ----------------         ---  --------------------------------------------------
<S>                      <C> <C>
Pierre Faurre...........  57 Chairman and Chief Executive Officer, SAGEM (1987-
                             present); Member of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2001).

Ricardo Fornesa Ribo....  67 Chief Executive Officer, Sociedad General de Aguas
                             de Barcelona, S.A. (1979-present); Board Secretary
                             and Assistant to the President, Caixa d'Estalvis i
                             Pensions de Barcelona (1979-present); Member of the
                             Supervisory Board, Suez Lyonnaise des Eaux (1998-
                             2001); Director, Inmobiliara Colonial (1992-
                             present); Director, E. Nacional Hidroelectrica del
                             Ribagorzana (ENHER) Electricity (1994-present);
                             Director, Cia. de Seguros Adeslas, S.A. (1994-1998);
                             Director, Cia de Telecomunicaciones de Chile (1997-
                             present). Spanish Citizen.

Albert Frere............  73 Chairman of the Board, Groupe Bruxelles Lambert S.A.
                             (1988-present); Chairman of the Board, Petrofina
                             S.A. (1990-present); Chairman of the Board,
                             Electrafina S.A. (1982-present); Chairman of the
                             Board, Frere-Bourgeois S.A. (1970-present); Chairman
                             of the Board, Erbe S.A. (1975-present); Deputy
                             Chairman, Managing Director, and Member of the
                             Executive Committee, Pargesa Holding S.A. (1981-
                             present); Deputy Chairman, Compagnie Benelux Paribas
                             S.A. (1973-present); Deputy Chairman, Total Fina
                             S.A. (1999-present); Member of the Supervisory
                             Board, Suez Lyonnaise des Eaux (1997-present);
                             Director, Coparex S.A. (1978-present); Director,
                             Television Francaise 1, S.A. (1996-present);
                             Director, L.V.M.H. S.A. (1997-present); Director,
                             Audiofina S.A. (1992-present); Director, CLT/UFA
                             (1987-present); Honorary Member of the Council of
                             Regents, Banque Nationale de Belgique S.A. (1995-
                             present). Belgian Citizen.

Frederick Holliday......  63 Chairman, Northumbrian Water Group (1993-present);
                             Chairman, The Go-Ahead Group Plc (as of 1997); Board
                             Member, Brewin Dolphin Plc (as of 1996); Chairman,
                             Northern Venture Capital Fund (1985); Member of the
                             Supervisory Board, Suez Lyonnaise des Eaux (1997-
                             2001); Board Member, Shell UK Limited (1980-1998);
                             Board Member, Union Railways (1993-1996); Board
                             Member, British Rail (1990-1993); Vice Chancellor,
                             Durham University (1980-1990); Chairman, Northern
                             Regional Board, Lloyds Bank (1986-1989); President
                             of the Freshwater Biological Association; President,
                             British Trust for Ornithology; former Council Member
                             for WaterAid; former Chairman of the Nature
                             Conservancy Council; Past President of the Scottish
                             Marine Biological Association. British Citizen.

Philippe Jaffre.........  53 Chairman and Chief Executive Officer, Elf Aquitaine
                             (1993-present); Member of the Supervisory Board,
                             Suez Lyonnaise des Eaux (1997-2001).

Jacques Lagarde.........  61 Executive Vice President, the Gillette Company
                             (1993-1998); Member of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2001). American Citizen.
</TABLE>

                                      I-2
<PAGE>

<TABLE>
<CAPTION>
Name and Current                  Present Principal Occupation or Employment;
Business Address         Age  Material Positions Held During the Past Five Years
- ----------------         ---  --------------------------------------------------
<S>                      <C> <C>
Jean Peyrelevade........  59 Chairman, Credit Lyonnais (1993-present); Member of
                             the Supervisory Board, Suez Lyonnaise des Eaux
                             (1997-2001).

Claude Pierre-            71 Chairman, Caisse de Refinancement Hypothecaire
 Brossolette............     (1995-present); Chairman, Banque Eurofin (1995-
                             1996); Member of the Supervisory Board, Suez
                             Lyonnaise des Eaux (1997-2000); Director, Credit
                             Lyonnais (1994-present); Director, Compagnie des
                             Signaux (1996-present).

Jean Syrota.............  62 Chairman and Chief Executive, Compagnie Generale des
                             Matieres Nucleaires (COGEMA) (1988-present);
                             Director, TOTAL S.A. (1993-present); Director,
                             Framatome (1989-present); Permanent Representative
                             of COGEMA, Usinor (1995-present); Director, SAGEM
                             (1996-present); Director, CEA-Industrie (1993-
                             present); Board Member, CFC (1989-present); Board
                             Member, FBFC (1989-present); Member of the
                             Supervisory Board, Suez Lyonnaise des Eaux (1997-
                             2001); Director, ERAP (1998-present); Permanent
                             representative of COGEMA, EURODIF (1989-1997).

Gerard Mestrallet.......  50 President of the Executive Board and Chief Executive
                             Officer, Suez Lyonnaise des Eaux (1997-present);
                             Chairman and Chief Executive Officer, Compagnie de
                             Suez (1995-1997); Chief Executive Officer and
                             Chairman of the Management Committee, Societe
                             Generale de Belgique (1991-1995); Senior executive
                             vice-president, Compagnie de Suez (1991-1995).

Philippe Brongniart.....  60 Member of the Executive Board, Suez Lyonnaise des
                             Eaux (1997-present); Director, H2O Acquisition Co.
                             (1999-present); Executive Vice President, Lyonnaise
                             des Eaux (1993-1997).

Francois Jaclot.........  50 Executive Vice President and Member of the Executive
                             Board, Suez Lyonnaise des Eaux (1997-present);
                             Senior Executive Vice President; Compagnie de Suez
                             (1996-1997); Managing Partner, Demachy Worms &
                             Compagnie (1994-1995); Director, Societe Generale de
                             Belgique (1996-present); Director, GTM (1998-
                             present); Director, Sita (1998-present); Director,
                             Elyo (1998-present); Director, TPS (1998-present);
                             Director, Banque Sofinco (1996-present); Director,
                             Suez Industrie (1996-present); Director, M6 (1998-
                             present); Director, Lyonnaise Communications (1998-
                             present).

Patrick Buffet..........  45 Executive Vice President, Suez Lyonnaise des Eaux
                             (1998-present); Director, H2O Acquisition Co. (1999-
                             present); Director of International Holdings,
                             Societe Generale de Belgique (1994-1998).
</TABLE>

2. DIRECTORS AND EXECUTIVE OFFICERS OF H2O ACQUISITION CO.

  Set forth below is the name, present principal occupation or employment and
material occupations, positions, offices or employment for the past five years
of each director and executive officer of H2O Acquisition Co. ("Purchaser").
Each person identified below has held his position since the formation of
Purchaser on June 24, 1999. The principal address of Purchaser and, unless
indicated below, the current business address for

                                      I-3
<PAGE>

each individual listed below c/o Suez Lyonnaise des Eaux, 1, rue d'Astorg,
75008 Paris, France. Telephone: 011-33-1-40-06-64-00. Each such person is,
unless indicated below, a citizen of France. Directors are identified by an
asterisk.

<TABLE>
<CAPTION>
Name and Current                  Present Principal Occupation or Employment;
Business Address         Age  Material Positions Held During the Past Five Years
- ----------------         ---  --------------------------------------------------
<S>                      <C> <C>
Philippe Brongniart*....  60 Member of the Executive Board, Suez Lyonnaise des
                             Eaux (1997-present); Director, H2O Acquisition Co.
                             (1999-present); Executive Vice President, Lyonnaise
                             des Eaux (1993-1997).

Patrick Buffet*.........  45 Executive Vice President, Suez Lyonnaise des Eaux
                             (1998-present); Director, H2O Acquisition Co. (1999-
                             present); Director of International Holdings,
                             Societe Generale de Belgique (1994-1998).

Christian Maurin........  52 Chairman and Chief Executive Officer, Degremont
                             (1999-present); Chairman and Chief Executive
                             Officer, Banque Indosuez (1996-1998); President, H2O
                             Acquisition Co. (1999-present); Chairman and Chief
                             Executive Officer, Banque Sofinco (1993-1996).
</TABLE>

3. OWNERSHIP OF SHARES BY DIRECTORS AND EXECUTIVE OFFICERS

  To the best knowledge of Parent and Purchaser, none of the persons listed on
this Schedule I beneficially owns or has a right to acquire directly or
indirectly any Shares, and none of the persons listed on this Schedule I has
effected any transactions in the Shares during the past 60 days.

                                      I-4
<PAGE>

  Copies of the Letters of Transmittal, properly completed and duly signed,
will be accepted. The Letter of Transmittal, certificates and any other
required documents should be sent by each Holder or such Holder's broker,
dealer, commercial bank, trust company or other nominee to the Depositary at
one of the addresses set forth below:

                       The Depositary for the Offer is:

                    FIRST CHICAGO TRUST COMPANY OF NEW YORK

         By Hand:                  By Mail:           By Overnight Courier:
   First Chicago Trust       First Chicago Trust       First Chicago Trust
   Company of New York       Company of New York       Company of New York



 c/o Securities Transfer      Corporate Actions         Corporate Actions
  and Reporting Services          Suite 4660                Suite 4680
           Inc.                 P.O. Box 2569       14 Wall Street, 8th Floor
 Attn: Corporate Actions    Jersey City, NJ 07303-      New York, NY 10005
   100 William Street,               2569
         Galleria
    New York, NY 10038

  Questions and requests for assistance may be directed to the Information
Agent or the Dealer Manager at their respective addresses and telephone
numbers as set forth below. Additional copies of this Offer to Purchase, the
Letter of Transmittal, or other related tender offer materials may be obtained
from the Information Agent or from brokers, dealers, commercial banks or trust
companies.

                    The Information Agent for the Offer is:

                              MORROW & CO., INC.
                          445 Park Avenue, 5th Floor
                           New York, New York 10022
                         Collect Call: (212) 754-8000
                    Banks and Brokerage Firms, please call:
                                (800) 662-5200

                   Shareholders Please Call: (800) 566-9061

                     The Dealer Manager for the Offer is:

                               J.P. Morgan & Co.
                                60 Wall Street
                           New York, New York 10260
                           Toll Free: (877) 219-8026

<PAGE>


                                                                 Exhibit (a)(2)

                             LETTER OF TRANSMITTAL
                                   To Tender
                             Shares of Common Stock
           (Including the Associated Preferred Stock Purchase Rights)
                                      and
              Shares of Series B ESOP Convertible Preferred Stock
                                       of
                             NALCO CHEMICAL COMPANY
                       Pursuant to the Offer to Purchase
                               Dated July 1, 1999
                                       by
                              H2O ACQUISITION CO.,
                          a wholly owned subsidiary of
                            SUEZ LYONNAISE DES EAUX

  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON FRIDAY, JULY 30, 1999, UNLESS THE OFFER IS EXTENDED.

                        The Depositary for the Offer is:

                    First Chicago Trust Company of New York

        By Hand:                    By Mail:          By Overnight Courier:
   First Chicago Trust   First Chicago Trust Company of
       Company of                                  First Chicago Trust Company
                                    New York                   of
        New York               Corporate Actions            New York
 c/o Securities Transfer           Suite 4660           Corporate Actions
           and                   P.O. Box 2569             Suite 4680
 Reporting Services Inc.                            14 Wall Street, 8th Floor
                           Jersey City, NJ 07303-2569
 Attn: Corporate Actions                               New York, NY 10005
   100 William Street,
        Galleria
   New York, NY 10038

                         DESCRIPTION OF SHARES TENDERED
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                   Name(s) and Address(es) of Registered Holder(s)
               (Please fill in, if blank, exactly as name(s) appear(s)                             Shares Tendered
                                on the certificate(s))                                  (Attach additional list if necessary)
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                    Total Number
                                                                                                      of Shares      Number
                                                                                       Certificate  Evidenced by    of Shares
                                                                                       Number(s)*  Certificate(s)* Tendered:**
                                                                                       ---------------------------------------
<S>                                                                                    <C>         <C>             <C>

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

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

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

- --------------------------------------------------                                     -------------------------------
                                                                                       -------------------------------
</TABLE>


     Total Shares
     Tendered...
- -------------------------------------------------------------------------------

  * Need not be completed by Book-Entry Holders.
 ** Unless otherwise indicated, it will be assumed that all
    Shares evidenced by any Share Certificate(s) delivered to the
    Depositary are being tendered. See Instruction 4.
<PAGE>

  DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY TO THE DEPOSITARY.

  THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.

  This Letter of Transmittal is to be completed by holders of certificates
representing (i) shares of common stock, par value $0.1875 per share,
including the associated preferred stock purchase rights (the "Common Stock")
or (ii) shares of Series B ESOP Convertible Preferred stock (the "ESOP
Preferred Stock" and together with the Common Stock, the "Shares") (such
holders of Shares, collectively, the "Holders"). If you hold Shares in book-
entry form, you may tender your Shares by book-entry transfer to the account
maintained by the Depositary at The Depository Trust Company ("DTC") (the
"Book-Entry Transfer Facility"), along with an Agent's Message (as defined in
the Offer to Purchase), pursuant to the procedures set forth in Section 3--
"Procedures for Tendering Shares" of the Offer to Purchase. Holders who tender
Shares by book-entry transfer are referred to herein as "Book-Entry Holders"
and other Holders are referred to herein as "Certificate Holders."

  Holders whose certificates evidencing Shares (the "Certificates") are not
immediately available or who cannot deliver their Certificates and all other
documents required hereby to the Depositary on or prior to the Expiration Date
(as defined in Section 1--"Terms of the Offer" of the Offer to Purchase), or
who cannot comply with the book-entry transfer procedures on a timely basis,
may nevertheless tender their Shares according to the guaranteed delivery
procedure set forth in Section 3--"Procedures for Tendering Shares" of the
Offer to Purchase. See Instruction 2 of this Letter of Transmittal. DELIVERY
OF DOCUMENTS TO A BOOK-ENTRY TRANSFER FACILITY DOES NOT CONSTITUTE DELIVERY TO
THE DEPOSITARY.

CHECK HERE IF SHARES ARE BEING TENDERED PURSUANT TO A NOTICE OF GUARANTEED
DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE FOLLOWING:

Name(s) of Registered Holder(s) _______________________________________________

Window Ticket Number (if any) _________________________________________________

Date of Execution of Notice of Guaranteed Delivery ____________________________

Name of Institution which Guaranteed Delivery _________________________________

DTC Account Number (if delivered by Book-Entry Transfer) ______________________

Transaction Code Number _______________________________________________________

CHECK HERE IF TENDER IS BEING MADE IN RESPECT OF LOST OR MUTILATED SECURITIES.
SEE INSTRUCTION 9.

                    NOTE: SIGNATURES MUST BE PROVIDED BELOW

                                       2
<PAGE>

              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

  The undersigned hereby tenders to H2O Acquisition Co. ("Purchaser"), a
Delaware corporation and a wholly owned subsidiary of Suez Lyonnaise des Eaux,
a societe anonyme organized and existing under the laws of the Republic of
France ("Parent"), the above-described shares of common stock, par value
$0.1875 per share, including the associated preferred stock purchase rights
(the "Common Stock") and the shares of Series B ESOP Convertible Preferred
Stock (the "ESOP Preferred Stock" and together with the Common Stock, the
"Shares") of Nalco Chemical Company, a Delaware corporation (the "Company")
upon the terms and subject to the conditions set forth in the Offer to
Purchase dated July 1, 1999 (the "Offer to Purchase"), receipt of which is
hereby acknowledged, and in this Letter of Transmittal (which, together with
the Offer to Purchase, as they may be amended and supplemented from time to
time, constitute the "Offer"). The undersigned understands that Purchaser
reserves the right to assign to an affiliate of Parent the right to purchase
all or any portion of the Shares tendered pursuant to the Offer, but the
undersigned further understands that any such assignment will not relieve
Purchaser of its obligations under the Offer and that any such assignment will
in no way prejudice the rights of tendering Holders to receive payment for the
Shares validly tendered and accepted for payment pursuant to the Offer.

  Subject to, and effective upon acceptance for payment of, and payment for,
the Shares tendered herewith in accordance with the terms of the Offer
(including, if the Offer is extended or amended, the terms and conditions of
such extension or amendment), the undersigned hereby sells, assigns and
transfers to, or upon the order of, Purchaser, all right, title and interest
in and to all of the Shares that are being tendered hereby and any and all
dividends, distributions, rights, or other securities issued or issuable in
respect of such Shares on or after June 27, 1999 (collectively,
"Distributions"), and irrevocably appoints the Depositary the true and lawful
agent and attorney-in-fact of the undersigned with respect to such Shares and
all Distributions with full power of substitution (such power of attorney
being deemed to be an irrevocable power coupled with an interest) to (a)
transfer ownership of such Shares and all Distributions, together with all
accompanying evidences of transfers and authenticity, to or upon the order of
Purchaser, (b) present such Shares and all Distributions for transfer on the
books of the Company and (c) receive all benefits and otherwise exercise all
rights of beneficial ownership of such Shares and all Distributions, all in
accordance with the terms and subject to the conditions of the Offer as set
forth in the Offer to Purchase.

  The undersigned hereby irrevocably appoints each designee of Purchaser as
such attorney-in-fact and proxy of the undersigned, with full power of
substitution, to vote in such manner as each such attorney-in-fact and proxy
(or any substitute thereof) shall deem proper in its sole discretion, and to
otherwise act (including pursuant to written consent) to the full extent of
the undersigned's rights with respect to the Shares and all Distributions
tendered hereby and accepted for payment by Purchaser prior to the time of
such vote or action. All such proxies shall be considered coupled with an
interest in the tendered Shares and shall be irrevocable and are granted in
consideration of, and are effective upon, the acceptance for payment of such
Shares and all Distributions by Purchaser in accordance with the terms of the
Offer. Such acceptance for payment by Purchaser shall revoke, without further
action, any other proxy or power of attorney granted by the undersigned at any
time with respect to such Shares and all Distributions and no subsequent
proxies or powers of attorney will be given (or, if given, will not be deemed
effective) with respect thereto by the undersigned. The designees of Purchaser
will, with respect to the Shares for which the appointment is effective, be
empowered to exercise all voting and other rights as they in their sole
discretion may deem proper at any annual, special, adjourned or postponed
meeting of the Company's stockholders, by written consent or otherwise, and
Purchaser reserves the right to require that, in order for Shares or any
Distributions to be deemed validly tendered, immediately upon Purchaser's
acceptance for payment of such Shares, Purchaser must be able to exercise all
rights (including, without limitation, all voting rights and rights of
conversion) with respect to such Shares and receive all Distributions.

  The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, sell, assign and transfer the Shares and all
Distributions tendered hereby and that, when the same are accepted for payment
by Purchaser, Purchaser will acquire good, marketable and unencumbered title
thereto, free and clear

                                       3
<PAGE>

of all liens, restrictions, charges and encumbrances, and the same will not be
subject to any adverse claim. The undersigned will, upon request, execute and
deliver any additional documents deemed by the Depositary or Purchaser to be
necessary or desirable to complete the sale, assignment, and transfer of the
Shares and all Distributions tendered hereby. In addition, the undersigned
shall promptly remit and transfer to the Depositary for the account of
Purchaser any and all Distributions in respect of the Shares tendered hereby,
accompanied by appropriate documentation of transfer and, pending such
remittance or appropriate assurance thereof, Purchaser shall be entitled to
all rights and privileges as owner of any such Distributions and may withhold
the entire purchase price or deduct from the purchase price the amount or
value thereof, as determined by Purchaser in its sole discretion.

  No authority herein conferred or agreed to be conferred shall be affected
by, and all such authority shall survive, the death or incapacity of the
undersigned. All obligations of the undersigned hereunder shall be binding
upon the heirs, personal representatives, successors and assigns of the
undersigned. Subject to the withdrawal rights set forth in Section 4--
"Withdrawal Rights" of the Offer to Purchase, the tender of the Shares and
related Distributions hereby made is irrevocable.

  The undersigned understands that tenders of Shares pursuant to any of the
procedures described in Section 3--"Procedures for Tendering Shares" of the
Offer to Purchase and in the instructions hereto will constitute the
undersigned's acceptance of the terms and conditions of the Offer. Purchaser's
acceptance for payment of such Shares will constitute a binding agreement
between the undersigned and Purchaser upon the terms and subject to the
conditions set forth in the Offer. The undersigned recognizes that under
certain circumstances set forth in the Offer to Purchase, Purchaser may not be
required to accept for payment any of the Shares tendered hereby.

  Unless otherwise indicated herein under "Special Payment Instructions,"
please issue the check for the purchase price and/or return any Common Stock
Certificates and ESOP Preferred Stock Certificates not tendered or not
accepted for payment in the name(s) of the registered holder(s) appearing
under "Description of Shares Tendered." Similarly, unless otherwise indicated
under "Special Delivery Instructions," please mail the check for the purchase
price and/or return any Certificates not tendered or not accepted for payment
(and accompanying documents, as appropriate) to the address(es) of the
registered holder(s) appearing under "Description of Shares Tendered." In the
event that both the Special Delivery Instructions and the Special Payment
Instructions are completed, please issue the check for the purchase price
and/or issue any Certificates not so tendered or accepted for payment in the
name of, and deliver said check and/or return such certificates to, the person
or persons so indicated. The undersigned recognizes that Purchaser has no
obligation, pursuant to the Special Payment Instructions, to transfer any
Shares from the name of the registered holder thereof if Purchaser does not
accept for payment any of the Shares so tendered.

                                       4
<PAGE>


    SPECIAL PAYMENT INSTRUCTIONS              SPECIAL DELIVERY INSTRUCTIONS
  (See Instructions 1, 5, 6 and 7)          (See Instructions 1, 5, 6 and 7)


 To be completed ONLY if                   To be completed ONLY if
 Certificate(s) not tendered or not        Certificate(s) not tendered or not
 purchased and/or the check for the        purchased and/or the check for the
 purchase price of Shares purchased        purchase price of Shares purchased
 are to be issued in the name of           are to be sent to someone other
 someone other than the                    than the undersigned, or to the
 undersigned.                              undersigned at an address other
                                           than that shown above.

 Issue check and Certificate(s) to:        Mail check and Certificate(s) to:
 Name: _____________________________       Name: _____________________________
        Please Type or Print                      Please Type or Print
 Address: __________________________       Address: __________________________
 ___________________________________       ___________________________________
         (Include Zip Code)                        (Include Zip Code)
 __________________________________*       ___________________________________
    (Tax Identification or Social             (Tax Identification or Social
            Security No.)                             Security No.)
  (See Substitute Form W-9 Included         (See Substitute Form W-9 Included
              Herewith)                                 Herewith)
- --------
 * Signature Guarantee required

                                       5
<PAGE>

                                   IMPORTANT
                              HOLDER(S) SIGN HERE
                           (See Instructions 1 and 5)
             (Please Complete Substitute Form W-9 Contained Herein)
 Signature(s) of Holder(s): __________________________________________________
 Date: _________________________________________________________________, 1999

 (Must be signed by registered holder(s) exactly as name(s) appear(s) on
 Certificate(s) or on a security position listing or by person(s) authorized
 to become registered holder(s) by certificate(s) and documents transmitted
 with this Letter of Transmittal. If signature is by trustees, executors,
 administrators, guardians, attorneys-in-fact, officers of corporations or
 other person acting in a fiduciary or representative capacity, please
 provide the following information and see Instruction 5.)
 Name(s): ____________________________________________________________________
                                 (Please Print)
 Capacity (Full Title): ______________________________________________________
 Address: ____________________________________________________________________
 _____________________________________________________________________________
 (Include Zip Code)
 ____________________________
 (Daytime Area Code and Telephone No.)
 ____________________________
 (Tax Identification and Social Security No.)
                           Guarantee of Signature(s)
                           (See Instructions 1 and 5)

 FOR USE BY FINANCIAL INSTITUTIONS ONLY.
 FINANCIAL INSTITUTIONS: PLACE MEDALLION GUARANTEE IN SPACE BELOW



                                       6
<PAGE>

                                 INSTRUCTIONS

             Forming Part of the Terms and Conditions of the Offer

  1. Guarantee of Signatures. Except as otherwise provided below, all
signatures on this Letter of Transmittal must be guaranteed by a financial
institution (including most banks, savings and loan associations and brokerage
houses) which is a participant in the Security Transfer Agents Medallion
Program (an "Eligible Institution"). Signatures on this Letter of Transmittal
need not be guaranteed (a) if this Letter of Transmittal is signed by the
registered holder(s) of the Shares tendered herewith and such holder(s) have
not completed the box entitled either "Special Payment Instructions" or
"Special Delivery Instructions" on this Letter of Transmittal or (b) if such
Shares are tendered for the account of an Eligible Institution. See
Instruction 5 of this Letter of Transmittal.

  2. Delivery of Letter of Transmittal and Share Certificates or Book-Entry
Confirmations. This Letter of Transmittal is to be used if Certificates are to
be forwarded herewith. Certificates evidencing all physically tendered Shares
along with this Letter of Transmittal or a copy thereof, properly completed
and duly executed with any required signature guarantees, and any other
documents required by this Letter of Transmittal, must be received by the
Depositary at one of its addresses set forth herein on or prior to the
Expiration Date (as defined in Section 1--"Terms of the Offer" of the Offer to
Purchase). Shares held through DTC must be tendered to the Depositary by means
of delivery of an Agent's Message (as more fully described in the Offer to
Purchase).

  Holders whose Certificates are not immediately available or who cannot
deliver their Certificates and all other required documents to the Depositary
on or prior to the Expiration Date or who cannot complete the procedures for
book-entry transfer on a timely basis may nevertheless tender their Shares by
properly completing and duly executing a Notice of Guaranteed Delivery
pursuant to the guaranteed delivery procedure set forth in Section 3--
"Procedures for Tendering Shares" of the Offer to Purchase. Pursuant to such
procedure: (i) such tender must be made by or through an Eligible Institution;
(ii) a properly completed and duly executed Notice of Guaranteed Delivery,
substantially in the form provided by Purchaser, must be received by the
Depositary on or prior to the Expiration Date; and (iii) Certificates, as well
as a Letter of Transmittal, properly completed and duly executed with any
required signature guarantees, and all other documents required by this Letter
of Transmittal must be received by the Depositary within three New York Stock
Exchange trading days after the date of execution of such Notice of Guaranteed
Delivery.

  If Certificates are forwarded to the Depositary in multiple deliveries, a
properly completed and duly executed Letter of Transmittal (or copy thereof)
must accompany each such delivery.

  The method of delivery of this Letter of Transmittal, Shares, Certificates
and all other required documents, including delivery through the Book-Entry
Transfer Facility, is at the risk of the tendering Holder and the delivery
will be deemed made only when actually received by the Depositary. If such
delivery is by mail, registered mail with return receipt requested, properly
insured, is recommended. In all cases, sufficient time should be allowed to
assure timely delivery.

  No alternative, conditional or contingent tenders will be accepted and no
fractional Shares will be purchased. All tendering Holders, by execution of
this Letter of Transmittal or a copy hereof, waive any right to receive any
notice of the acceptance of their Shares for payment.

  3. Inadequate Space. If the space provided under "Description of Shares
Tendered" is inadequate, the Share Certificate numbers and/or the number of
Shares should be listed on a separate schedule and attached hereto.

  4. Partial Tenders (Applicable to Holders of Share Certificates Only). If
fewer than all the Shares evidenced by any Certificate submitted are to be
tendered, fill in the number of Shares which are to be tendered in the box
entitled "Number of Shares Tendered." In such cases, new Certificate(s)
evidencing the remainder of

                                       7
<PAGE>

the Shares that were evidenced by Certificate(s) delivered to the Depositary
will be sent to the person signing this Letter of Transmittal, unless
otherwise provided in the box entitled "Special Delivery Instructions" on this
Letter of Transmittal, as soon as practicable after the Expiration Date. All
Shares represented by Certificates delivered to the Depositary will be deemed
to have been tendered unless otherwise indicated.

  5. Signatures on Letter of Transmittal; Stock Powers and Endorsements. If
this Letter of Transmittal is signed by the registered holder(s) of the Shares
tendered hereby, the signatures must correspond with the names as written on
the face of the Certificates without alteration, enlargement or any change
whatsoever.

  If any of the Shares tendered hereby are owned of record by two or more
joint owners, all such owners must sign this Letter of Transmittal.

  If any of the tendered Shares are registered in different names on several
Certificates, it will be necessary to complete, sign and submit as many
separate Letters of Transmittal as there are different registrations of the
Shares.

  If this Letter of Transmittal or any Certificate or stock power is signed by
a trustee, executor, administrator, attorney-in-fact, officer of a corporation
or other person acting in a fiduciary or representative capacity, such person
should so indicate when signing, and evidence satisfactory to the Depositary
and Purchaser of such person's authority so to act must be submitted.

  If this Letter of Transmittal is signed by the registered holder(s) of the
Shares transmitted hereby, no endorsements of Certificates or separate stock
powers are required unless payment is to be made to, or Certificates
evidencing the Shares not tendered or purchased are to be issued in the name
of, a person other than the registered holder(s). Signatures on such
Certificates or stock powers must be guaranteed by an Eligible Institution.

  If this Letter of Transmittal is signed by a person other than the
registered holder of the Shares tendered hereby, the Certificate(s) must be
endorsed or accompanied by appropriate stock powers, in either case signed
exactly as the name or names of the registered holder or holders appear(s) on
such Certificate(s). Signatures on such Certificates or stock powers must be
guaranteed by an Eligible Institution.

  6. Transfer Taxes. Except as otherwise provided in this Instruction 6,
Purchaser will pay or cause to be paid any transfer taxes with respect to the
transfer and sale of purchased Shares to it or its order pursuant to the
Offer. If, however, payment of the purchase price of any Shares purchased is
to be made to or, in the circumstances permitted hereby, if Certificates for
the Shares not tendered or purchased are to be registered in the name of, any
person other than the registered holder, or if tendered Certificates are
registered in the name of any person other than the person(s) signing this
Letter of Transmittal, the amount of any transfer taxes (whether imposed on
the registered holder or such person) payable on account of the transfer to
such person will be deducted from the purchase price if satisfactory evidence
of the payment of such taxes, or exemption therefrom, is not submitted.

  Except as provided in this Instruction 6, it will not be necessary for
transfer tax stamps to be affixed to the Certificates listed in this Letter of
Transmittal.

  7. Special Payment and Delivery Instructions. If a check for the purchase
price is to be issued in the name of, and/or Certificates for the Shares not
tendered or not accepted for payment are to be issued in the name of a person
other than the signer of this Letter of Transmittal or if a check and/or such
Share are to be mailed to someone other than the signer of this Letter of
Transmittal or to an address other than that shown above, the appropriate
boxes on this Letter of Transmittal should be completed.

  8. Requests for Assistance or Additional Copies. Questions or requests for
assistance may be directed to, or additional copies of the Offer to Purchase,
this Letter of Transmittal, the Notice of Guaranteed Delivery

                                       8
<PAGE>

and other tender offer materials may be obtained from, the Information Agent
or the Dealer Manager at their respective addresses set forth on the back
cover of the Offer to Purchase or from your broker, dealer, commercial bank or
trust company.

  9. Lost or Destroyed Certificates. If any Certificates have been lost or
destroyed, the Holder should promptly notify the Company's transfer agent,
First Chicago Trust Company of New York. The Holder will then be instructed as
to the procedure to be followed in order to replace the relevant Certificates.
This Letter of Transmittal and related documents cannot be processed until the
procedures for replacing lost or destroyed Certificates have been followed.

                           IMPORTANT TAX INFORMATION

  Under United States federal income tax law, a tendering Holder may be
subject to backup withholding tax at a rate of 31% with respect to payments by
the Depositary pursuant to the Offer unless such Holder (i) is a corporation
or other exempt recipient and, if required, establishes its exemption from
backup withholding, (ii) provides its correct taxpayer identification number
("TIN"), certifies that it is not currently subject to backup withholding and
otherwise complies with applicable requirements of the backup withholding
rules, or (iii) certifies as to its non-United States status. Completion of a
Substitute Form W-9, in the case of a U.S. Holder, provided in this Letter of
Transmittal should be used for this purpose. Failure to provide such Holder's
TIN on the Substitute Form W-9, if applicable, may subject the tendering
Holder (or other payee) to a $50 penalty imposed by the Internal Revenue
Service ("IRS"). More serious penalties may be imposed for providing false
information which, if willfully done, may result in fines and/or imprisonment.
The box in part 3 of the Substitute Form W-9 may be checked if the tendering
Holder (or other payee) is required to submit a Substitute Form W-9 and has
not been issued a TIN and has applied for a TIN or intends to apply for a TIN
in the near future. If the box in Part 3 is so checked and the Depositary is
not provided with a TIN by the time of payment, the Depositary will withhold
31% on all such payments of the Offer Price until a TIN is provided to the
Depositary. In order for a foreign Holder to qualify as an exempt recipient,
that Holder should submit an IRS Form W-8 or a Substitute Form W-8, signed
under penalties of perjury, attesting to that Holder's exempt status. Such
forms can be obtained from the Depositary. Failure to provide the information
on the form may subject tendering Holders to 31% United States federal income
tax withholding on the payment of the purchase price of cash pursuant to the
Offer.

IMPORTANT:  THIS LETTER OF TRANSMITTAL OR A COPY HEREOF TOGETHER WITH
            CERTIFICATES AND ALL OTHER REQUIRED DOCUMENTS OR THE NOTICE OF
            GUARANTEED DELIVERY MUST BE RECEIVED BY THE DEPOSITARY ON OR PRIOR
            TO THE EXPIRATION DATE.

                                       9
<PAGE>

                 TO BE COMPLETED BY ALL TENDERING U.S. HOLDERS
            (See "Important Tax Information" on the preceding page)
             PAYER'S NAME: First Chicago Trust Company of New York
- -------------------------------------------------------------------------------

                           Part 1-PLEASE PROVIDE      Social Security Number
 SUBSTITUTE                YOUR TIN IN THE BOX AT               or
 Form W-9                  RIGHT AND CERTIFY BY       Employer Identification
                           SIGNING AND DATING                 Number:
 Department of             BELOW                     _________________________
 the Treasury             -----------------------------------------------------
 Internal Revenue
 Service

                           Part 2-If you are exempt       Part 3-If you are
                           from backup withholding,       awaiting a TIN,
                           please check this box:  [_]    please check this
                                                          box: [_]
 Payer's Request for      -----------------------------------------------------
 Taxpayer Identification   Part 4-Certification-Under penalties of perjury, I
 Number ("TIN") and        certify that:
 Certification             (1) The number shown on this form is my correct
                           Taxpayer Identification Number (or I am waiting
                           for a number to be issued to me), and
                           (2) I am not subject to backup withholding because
                           (i) I am exempt from backup withholding, (ii) I
                           have not been notified by the Internal Revenue
                           Service (the "IRS") that I am subject to backup
                           withholding as a result of a failure to report all
                           interest or dividends, or (iii) the IRS has
                           notified me that I am no longer subject to backup
                           withholding.

                           Certification Instructions-You must cross out item
                           (2) above if you have been notified by the IRS
                           that you are currently subject to backup
                           withholding because of under-reporting interest or
                           dividends on your tax return.
                          -----------------------------------------------------
                           SIGNATURE _______________________________DATE
                           NAME (Please Print) _______________________________
                           ADDRESS ___________________________________________
                           CITY, STATE AND ZIP CODE __________________________

NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE
REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

NOTE: YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN
PART 3 OF THE SUBSTITUTE FORM W-9

            CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

   I certify under penalties of perjury that a taxpayer identification number
 has not been issued to me, and either (1) I have mailed or delivered an
 application to receive a taxpayer identification number to the appropriate
 Internal Revenue Service Center or Social Security Administration office or
 (2) I intend to mail or deliver an application in the near future. I
 understand that if I do not provide a taxpayer identification number by the
 time of payment, 31% of all reportable cash payments made to me thereafter
 will be withheld until I provide a taxpayer identification number.
 Signature: _____________________________________ Date: ______________________

                                      10
<PAGE>

                    The Information Agent for the Offer is:

                               MORROW & CO., INC.

                           445 Park Avenue, 5th Floor
                            New York, New York 10022
                          Collect Call: (212) 754-8000
                    Banks and Brokerage Firms, please call:
                                 (800) 662-5200

                    Shareholders Please Call: (800) 566-9061

                      The Dealer Manager for the Offer is:

                               J.P. Morgan & Co.
                                 60 Wall Street
                               New York, NY 10260
                           Toll Free: (877) 219-8026

                                       11

<PAGE>

                                                                  Exhibit (a)(3)

                          OFFER TO PURCHASE FOR CASH

                 All of the Outstanding Shares of Common Stock
          (Including the Associated Preferred Stock Purchase Rights)
                                      and
  All of the Outstanding Shares of Series B ESOP Convertible Preferred Stock
                                      of
                            NALCO CHEMICAL COMPANY
                                      at
                     $53.00 Net Per Share of Common Stock
                                      and
     $1,060.00 Net Per Share of Series B ESOP Convertible Preferred Stock
                                      by
                             H2O ACQUISITION CO.,
                         A Wholly Owned Subsidiary of
                            SUEZ LYONNAISE DES EAUX

 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON FRIDAY, JULY 30, 1999 UNLESS THE OFFER IS EXTENDED.


                                                                   July 1, 1999

To Brokers, Dealers, Commercial Banks,
Trust Companies and Other Nominees:

  We have been appointed by H2O Acquisition Co., a Delaware corporation
("Purchaser") and a wholly owned subsidiary of Suez Lyonnaise des Eaux, a
societe anonyme organized and existing under the laws of the Republic of
France ("Parent"), to act as Dealer Manager in connection with Purchaser's
offer to purchase all of the issued and outstanding shares of common stock,
par value $0.1875 per share, including the associated preferred stock purchase
rights (the "Common Stock") and the Series B ESOP Convertible Preferred Stock
(the "ESOP Preferred Stock" and, together with the Common Stock, the
"Shares"), of Nalco Chemical Company, a Delaware corporation (the "Company"),
at a price of $53.00 per share of Common Stock and $1,060.00 per share of ESOP
Preferred Stock, net to the seller in cash, without interest thereon (the
"Offer Price"), upon the terms and subject to the conditions set forth in the
Offer to Purchase and in the related Letter of Transmittal (which, as they may
be amended and supplemented from time to time, together constitute the
"Offer"), copies of which are enclosed herewith. Please furnish copies of the
enclosed materials to those of your clients for whose accounts you hold Shares
in your name or in the name of your nominee.

  Enclosed herewith for your information and forwarding to your clients are
copies of the following documents:

  1. The Offer to Purchase dated July 1, 1999.

  2. The Letter of Transmittal to tender Shares for your use and for the
     information of your clients. Copies of the Letter of Transmittal may be
     used to tender Shares.
<PAGE>

  3. A letter to stockholders of the Company from E.J. Mooney, Chairman of
     the Board and Chief Executive Officer of the Company and Stephen D.
     Newlin, President of the Company, together with a
     Solicitation/Recommendation Statement on Schedule 14D-9 filed with the
     Securities and Exchange Commission by the Company and mailed to
     stockholders of the Company.

  4. The Notice of Guaranteed Delivery for Shares to be used to accept the
     Offer if the procedures for tendering Shares set forth in the Offer to
     Purchase cannot be completed on a timely basis.

  5. A printed form of letter which may be sent to your clients for whose
     accounts you hold Shares registered in your name or in the name of your
     nominee, with space provided for obtaining such clients' instructions
     with regard to the Offer.

  6. Guidelines of the Internal Revenue Service for Certification of Taxpayer
     Identification Number on Substitute Form W-9.

  7. A return envelope addressed to First Chicago Trust Company of New York,
     the Depositary.

  WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE. THE OFFER AND
WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON
FRIDAY, JULY 30, 1999 UNLESS THE OFFER IS EXTENDED.

  Please note the following:

  1. The Offer Price is $53.00 per share of Common Stock and $1,060.00 per
     share of ESOP Preferred Stock, net to the seller in cash, without
     interest thereon, as set forth in the Introduction to the Offer to
     Purchase.

  2. The Offer is conditioned upon, among other things, (i) there being
     validly tendered and not properly withdrawn prior to the expiration of
     the Offer a number of Shares which, when added to any shares of Common
     Stock already owned by Parent and Purchaser, constitute a majority of
     the then outstanding shares of Common Stock on a fully diluted basis
     (including, without limitation, all shares of Common Stock issuable upon
     the conversion of the ESOP Preferred Stock or any other convertible
     securities or upon the exercise of any options, warrants or rights) (the
     "Minimum Condition"), (ii) the satisfaction of the HSR Condition (as
     defined in the Offer to Purchase) and (iii) the satisfaction of the EC
     Condition (as defined in the Offer to Purchase). The Offer is also
     conditioned upon the satisfaction of certain other terms and conditions
     described in the Offer to Purchase. See the Introduction and Section 1--
     "Terms of the Offer" and Section 14--"Conditions of the Offer" of the
     Offer to Purchase.

  3. The Offer is being made for all of the issued and outstanding Shares.

  4. Tendering holders whose Shares are registered in their own name and who
     tender directly to First Chicago Trust Company of New York, as
     Depositary (the "Depositary"), will not be obligated to pay brokerage
     fees or commissions or, except as set forth in Instruction 6 of the
     Letter of Transmittal, transfer taxes on the purchase of Shares by
     Purchaser pursuant to the Offer. However, federal backup withholding tax
     at a rate of 31% may be required, unless an exemption is available or
     unless the required tax identification information is provided. See the
     "Important Tax Information" Section contained in the Letter of
     Transmittal.

  5. The Offer and withdrawal rights will expire at 12:00 midnight, New York
     City time, on Friday, July 30, 1999, unless the Offer is extended.

  6. On June 27, 1999, the Board of Directors of the Company unanimously (i)
     determined that the Merger is advisable and that the Merger Agreement
     and the transactions contemplated thereby, including the Offer, the
     Merger (as each defined herein) are fair to and in the best interests of
     the holders of Shares (the "Holders"), (ii) approved and adopted the
     Merger Agreement and the transactions contemplated thereby, (iii)
     recommended that the stockholders of the Company accept the Offer,
     approve the Merger, and approve and adopt the Merger Agreement and the
     transactions contemplated thereby, and (iv) approved the taking of all
     other applicable action necessary to render Section 203 of the Delaware
     General Corporate Law and other state takeover statutes and the Rights
     Agreement (as defined in the Offer to Purchase) inapplicable to the
     Offer and the Merger (as defined in the Offer to Purchase).


                                       2
<PAGE>

    The Offer is being made pursuant to the Agreement and Plan of Merger,
    dated as of June 27, 1999 (the "Merger Agreement"), among Parent,
    Purchaser and the Company. The Merger Agreement provides that, as
    promptly as practicable after consummation of the Offer, Purchaser will
    be merged with and into the Company (the "Merger").

  7. Notwithstanding any other provision of the Offer, payment for Shares
     accepted for payment pursuant to the Offer will in all cases be made
     only after timely receipt by the Depositary of (i) certificates
     evidencing such Shares (the "Certificates"), along with a properly
     completed and duly executed Letter of Transmittal (or a copy thereof),
     including any required signature guarantees, or (ii) if such Shares are
     held in book-entry form, timely confirmation of a book-entry transfer (a
     "Book-Entry Confirmation") of such Shares into the Depositary's account
     at The Depository Trust Company along with an Agent's Message (as
     defined in the Offer to Purchase), pursuant to the procedures set forth
     in Section 3--"Procedures for Tendering Shares" of the Offer to Purchase
     and (iii) any other documents required by the Letter of Transmittal.
     Accordingly, payment may not be made to all tendering holders at the
     same time depending upon when the Certificates are actually received by
     the Depositary.

  In order to take advantage of the Offer (i) a duly executed and properly
completed Letter of Transmittal (and any required signature guarantee or other
required documents) or an Agent's Message in the case of Shares held in book-
entry form should be sent to the Depositary and (ii) Certificates representing
the tendered Shares or a timely Book-Entry Confirmation should be delivered to
the Depositary in accordance with the instructions set forth in the Letter of
Transmittal and the Offer to Purchase.

  If a Holder wishes to tender, but it is impracticable for such Holder to
forward such Holder's Certificates or other required documents or complete the
procedures for book-entry transfer prior to the Expiration Date, a tender may
be effected by following the guaranteed delivery procedures specified in
Section 3--"Procedures for Tendering Shares" of the Offer to Purchase.

  Neither Parent nor Purchaser will pay any fees or commissions to any broker,
dealer or other person for soliciting tenders of Shares pursuant to the Offer
(other than the Dealer Manager, the Depositary and the Information Agent, as
described in the Offer to Purchase). Purchaser will, however, upon request,
reimburse you for customary mailing and handling expenses incurred by you in
forwarding any of the enclosed materials to your clients. Purchaser will pay
or cause to be paid any transfer taxes payable on the transfer of Shares to
it, except as otherwise provided in Instruction 6 of the Letter of
Transmittal.

  Any inquiries you may have with respect to the Offer should be addressed to
J.P. Morgan Securities Inc., the Dealer Manager for the Offer, at 60 Wall
Street, New York, New York 10260, telephone number (877) 219-8026 or to Morrow
& Co., Inc., the Information Agent for the Offer, at 445 Park Avenue, 5th
Floor, New York, New York 10022, telephone number (212) 754-8000 (call
collect) or (800) 662-5200.

  Requests for copies of the enclosed materials may also be directed to the
Dealer Manager or to the Information Agent at the above addresses and
telephone numbers.

                                          Very truly yours,

                                          J.P. MORGAN SECURITIES INC.

  NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU
OR ANY OTHER PERSON THE AGENT OF PURCHASER, PARENT, THE COMPANY, THE DEALER
MANAGER, THE DEPOSITARY, THE INFORMATION AGENT OR ANY AFFILIATE OF ANY OF
THEM, OR AUTHORIZE YOU OR ANY OTHER PERSON TO MAKE ANY STATEMENT OR USE ANY
DOCUMENT ON BEHALF OF ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE
ENCLOSED DOCUMENTS AND THE STATEMENTS CONTAINED THEREIN.

                                       3

<PAGE>

                                                                  Exhibit (a)(4)


                          OFFER TO PURCHASE FOR CASH
                 All of the Outstanding Shares of Common Stock
          (Including the Associated Preferred Stock Purchase Rights)

                                      and

  All of the Outstanding Shares of Series B ESOP Convertible Preferred Stock

                                      of

                            NALCO CHEMICAL COMPANY
                                      at
                     $53.00 Net Per Share of Common Stock
                                      and
     $1,060.00 Net Per Share of Series B ESOP Convertible Preferred Stock
                                      by
                             H2O ACQUISITION CO.,

                         A Wholly Owned Subsidiary of
                            SUEZ LYONNAISE DES EAUX

 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON FRIDAY, JULY 30, 1999 UNLESS THE OFFER IS EXTENDED.

                                                                   July 1, 1999

To Our Clients:

  Enclosed for your consideration are the Offer to Purchase, dated July 1,
1999 (the "Offer to Purchase"), and the related Letter of Transmittal (which,
as they may be amended and supplemented from time to time, together constitute
the "Offer") relating to the offer by H2O Acquisition Co., a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Suez Lyonnaise des
Eaux, a societe anonyme organized and existing under the laws of the Republic
of France ("Parent"), to purchase all of the issued and outstanding shares of
common stock, par value $0.1875 per share, including the associated preferred
stock purchase rights (the "Common Stock") and all of the issued and
outstanding shares of Series B ESOP Convertible Preferred Stock (the "ESOP
Preferred Stock" and together with the Common Stock, the "Shares"), of Nalco
Chemical Company, a Delaware corporation (the "Company"), at a price of $53.00
per share of Common Stock and $1,060.00 per share of ESOP Preferred Stock, net
to the seller in cash, without interest thereon (the "Offer Price"), upon the
terms and subject to the conditions set forth in the Offer to Purchase and in
the related Letter of Transmittal.

  We are (or our nominee is) the holder of record of Shares held for your
account. A tender of such Shares can be made only by us as the holder of
record and pursuant to your instructions. The Letter of Transmittal is
furnished to you for your information only and cannot be used by you to tender
Shares held by us for your account.

  Accordingly, we request instruction as to whether you wish to have us tender
on your behalf any or all of the Shares held by us for your account pursuant
to the terms and conditions set forth in the Offer.
<PAGE>

Please note the following:

  1. The Offer Price is $53.00 per share of Common Stock and $1,060.00 per
share of ESOP Preferred Stock, net to the seller in cash, without interest
thereon, as set forth in the Introduction to the Offer to Purchase.

  2. The Offer is conditioned upon, among other things, (i) there being
validly tendered and not properly withdrawn prior to the expiration of the
Offer a number of Shares which, when added to any shares of Common Stock
already owned by Parent, constitute a majority of the then-outstanding shares
of Common Stock on a fully diluted basis (including, without limitation, all
shares of Common Stock issuable upon the conversion of the ESOP Preferred
Stock or any other convertible securities or upon the exercise of any options,
warrants or rights), (ii) the satisfaction of the HSR Condition (as defined in
the Offer to Purchase) and (iii) the satisfaction of the EC Condition (as
defined in the Offer to Purchase). The Offer is also conditioned upon the
satisfaction of certain other terms and conditions described in the Offer to
Purchase. See the Introduction, Section 1--"Terms of the Offer" and Section
14--"Conditions of the Offer" of the Offer to Purchase.

  3. The Offer is being made for all of the issued and outstanding Shares.

  4. Tendering Holders whose Shares are registered in their own name and who
tender directly to First Chicago Trust Company of New York, as Depositary (the
"Depositary"), will not be obligated to pay brokerage fees or commissions or,
except as otherwise provided in Instruction 6 of the Letter of Transmittal,
transfer taxes on the purchase of Shares by Purchaser pursuant to the Offer.
However, United States federal backup withholding tax at a rate of 31% may be
withheld, unless an exemption is available or unless the required tax
identification information is provided. See the "Important Tax Information"
section contained in the Letter of Transmittal.

  5. The Offer and withdrawal rights will expire at 12:00 MIDNIGHT, NEW YORK
CITY TIME, on FRIDAY, JULY 30, 1999, unless the Offer is extended.

  6. On June 27, 1999 the Board of Directors of the Company unanimously (i)
determined that the Merger (as defined herein) is advisable and that the
Merger Agreement and the transactions contemplated thereby, including the
Offer and the Merger are fair to and in the best interests of the holders of
Shares (the "Holders"), (ii) approved and adopted the Merger Agreement and the
transactions contemplated thereby, (iii) recommended that the stockholders of
the Company accept the Offer, approve the Merger, and approve and adopt the
Merger Agreement and the transactions contemplated thereby and (iv) approved
the taking of all other applicable action necessary to render Section 203 of
the Delaware General Corporation Law and other state takeover statutes and the
Rights Agreement (as defined in the Offer to Purchase) inapplicable to the
Offer and the Merger (as defined herein).

  The Offer is being made pursuant to the Agreement and Plan of Merger, dated
as of June 27, 1999 (the "Merger Agreement"), among Parent, Purchaser and the
Company. The Merger Agreement provides that, as promptly as practicable after
consummation of the Offering, Purchaser will be merged with and into the
Company (the "Merger").

  7. Notwithstanding any other provision of the Offer, payment for Shares
accepted for payment pursuant to the Offer will in all cases be made only
after timely receipt by the Depositary of (i) certificates evidencing such
Shares (the "Certificates"), along with a properly completed and duly executed
Letter of Transmittal (or a copy thereof), including any required signature
guarantees, or (ii) if such Shares are held in book-entry form, timely
confirmation of a book-entry transfer of such Shares into the Depositary's
account at The Depository Trust Company, along with an Agent's Message (as
defined in the Offer to Purchase) pursuant to the procedures set forth in
Section 3--"Procedures for Tendering Shares" of the Offer to Purchase, and
(iii) any other documents required by the Letter of Transmittal. Accordingly,
payment may not be made to all tendering holders at the same time depending
upon when the Certificates are actually received by the Depositary.

  If you wish to have us tender any or all of the Shares held by us for your
account please so instruct us by completing, executing, detaching and
returning to us the instruction form set forth herein. If you authorize the
tender of your Shares, all such Shares will be tendered unless otherwise
specified below. An envelope to return your instructions to us is enclosed.
Your instructions should be forwarded to us in ample time to permit us to
submit a tender on your behalf prior to the expiration date.

                                       2
<PAGE>

  Purchaser is not aware of any state in the United States where the making of
the Offer is prohibited by administrative or judicial action pursuant to any
valid state statute. If Purchaser becomes aware of any valid state statute
prohibiting the making of the Offer or the acceptance of Shares pursuant
thereto, Purchaser will make a good faith effort to comply with such state
statute or seek to have such statute declared inapplicable to the Offer. If,
after such good faith effort, Purchaser cannot comply with such state statute,
the Offer will not be made to (nor will tenders be accepted from or on behalf
of) the Holders in such state. In any jurisdiction where the securities, blue
sky or other laws require the Offer to be made by a licensed broker or dealer,
the Offer shall be deemed to be made on behalf of Purchaser by J.P. Morgan
Securities Inc. or one or more registered brokers or dealers which are
licensed under the laws of such jurisdiction.

                                       3
<PAGE>

                       INSTRUCTIONS WITH RESPECT TO THE
                          OFFER TO PURCHASE FOR CASH
                 All of the Outstanding Shares of Common Stock
          (Including the Associated Preferred Stock Purchase Rights)
                 and Series B ESOP Preferred Convertible Stock
                                      of
                            Nalco Chemical Company


  The undersigned acknowledge(s) receipt of your letter, the Offer to
Purchase, dated July 1, 1999, and the related Letter of Transmittal (which, as
they may be amended and supplemented from time to time, together constitute
the "Offer") in connection with the offer by H2O Acquisition Co., a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Suez Lyonnaise des
Eaux, a societe anonyme organized and existing under the laws of the Republic
of France, to purchase all of the issued and outstanding shares of Common
Stock, par value $0.1875 per share, including the associated preferred stock
purchase rights (the "Common Stock"), and Series B ESOP Convertible Preferred
Stock (the "ESOP Preferred Stock" and, together with the Common Stock, the
"Shares"), of Nalco Chemical Company, a Delaware corporation, at a price of
$53.00 per share of Common Stock and $1,060.00 per share of ESOP Preferred
Stock, net to the seller in cash, without interest thereon.

  The undersigned hereby instructs you to tender to Purchaser the number of
Shares indicated below (or if no number is indicated below, all Shares) which
are held by you for the account of the undersigned, upon the terms and subject
to the conditions set forth in the Offer.


           Number of Shares to be Tendered*: ___________________

           Date: _______________________________________________

                                   SIGN HERE

           Signature(s): _______________________________________

           Print Name(s): ______________________________________

           _____________________________________________________

           Print Address(es): __________________________________

           _____________________________________________________

           Area Code and Telephone Number(s): __________________

           Taxpayer Identification or Social Security
           Number(s): __________________________________________

  This form must be returned to the brokerage firm maintaining your account.
- --------
* Unless otherwise indicated, it will be assumed that all of your Shares held
  by us for your account are to be tendered.

                                       4

<PAGE>

                                                                  Exhibit (a)(5)

FOR IMMEDIATE RELEASE

SUEZ LYONNAISE DES EAUX TO ACQUIRE NALCO CHEMICAL COMPANY FOR $4.1 BILLION IN
CASH TO BECOME WORLD'S LARGEST WATER TREATMENT COMPANY

- - Increases Suez Lyonnaise des Eaux' Water-Related Revenues to Over $7.4 Billion

- - Accretive and value creative

PARIS, FRANCE AND NAPERVILLE, ILLINOIS - June 28, 1999 - Suez Lyonnaise des Eaux
(LY: Paris Bourse), a world leader in private infrastructure services and Nalco
Chemical Company (NYSE: NLC), the world's largest provider of water treatment
services and products, announced a definitive agreement for Nalco to be acquired
by Suez Lyonnaise des Eaux in an all-cash transaction of approximately $4.1
billion, or $53 per share.

Under the terms of the agreement, which has been unanimously approved by the
Boards of Directors of both companies, Suez Lyonnaise des Eaux will seek to
acquire all of the outstanding common shares of Nalco Chemical Company through a
tender offer that will commence within five business days.

This acquisition follows Suez Lyonnaise des Eaux' June 15, 1999 announcement of
a definitive agreement to acquire Calgon, a Pittsburgh-based water treatment
company with annual revenues of close to $300 million.

Nalco Chemical Company, the world's largest water treatment company provides on-
site services to over 50,000 industrial and commercial customers in more than
120 countries.  For 1999, Nalco Chemical Company expects its revenues, including
affiliates, to be approximately $1.94 billion.

Commenting on this transaction, Gerard Mestrallet, Suez Lyonnaise des Eaux'
Chief Executive Officer and President of the Executive Board, said, "The
acquisition of Nalco Chemical Company fits perfectly into our strategic plan,
which emphasizes the international expansion and the integration of our core
businesses.  As a result of this transaction, Suez Lyonnaise des Eaux' total
water-related revenues will exceed $7.4 billion and, the combined company will
be in a strong position to serve industrial, middle-market, institutional and
process customers that are increasingly requiring comprehensive solutions."

Mr. Mestrallet continued, "Globally, the acquisition of Nalco Chemical Company
is another step in our strategy of providing our customers around the world with
integrated services in the water, energy and waste sectors.  As a global multi-
service group, we partner with our customers, enabling them to focus on their
core operations.  After carefully reviewing the market landscape, we are
confident that the people of Nalco Chemical Company share this vision and that
our
<PAGE>

business model will result in an accelerated growth rate for Suez Lyonnaise
des Eaux' water treatment business."

Suez Lyonnaise des Eaux expects this transaction to be value creating and
immediately accretive to cash flow in the first year and to be accretive to
earnings beginning in the second year.  The Company expects to realize more than
$100 million in cost savings as a result of economies of scale, revenue
enhancement and development synergies, and to take full advantage of important
cross-selling opportunities.

Edward J. Mooney, Chairman and Chief Executive Officer of Nalco Chemical
Company, noted, "We are very pleased with this agreement, which provides
substantial value for our shareholders as well as key growth opportunities and
benefits for our company and its customers.  Our goal at Nalco Chemical Company
has been to use our on-site expertise, technical innovation and global presence
to improve the profitability of our customers' dynamic and changing operations.
As part of the Suez Lyonnaise des Eaux Group, we dramatically increase our
ability to provide an expanded array of value-added products and services to our
customers."

"We expect the combination of our worldwide market positions, R&D and technical-
knowhow to give us a meaningful competitive advantage in the marketplace," Mr.
Mooney added.

Suez Lyonnaise des Eaux will base its worldwide water treatment operating center
in Naperville, under the direction of Mr. Mooney.

The transaction is subject to customary regulatory approvals in the United
States and Europe and is expected to be completed during the third quarter of
1999.

Suez Lyonnaise des Eaux stated that it expects to fund 50% of the all-cash
transaction internally, with the remaining 50% financed by a bridge loan that is
already in place.

With annual revenues $32.5 billion, Suez Lyonnaise des Eaux is a world leader in
private infrastructure services, with operations in more than 120 countries.
The Company is a market leader in the water sector supplying drinking water to
77 million people and providing wastewater services to 52 million people.  The
Group's three international core business sectors are: energy, water, and waste
services.

Headquartered in Naperville, Illinois, outside of Chicago, Nalco Chemical
Company employs 7000 people of which about 3600 are engineers and technicians
with direct customer contact and 300 are researchers located in 5 R & D centers.



                                      -2-

<PAGE>

                                                                EXHIBIT (a)(6)

This announcement is neither an offer to purchase nor a solicitation of an offer
to sell Shares. The Offer is made solely by the Offer to Purchase dated
July 1, 1999, and the related Letter of Transmittal and is being made to all
holders of Shares. Purchaser is not aware of any state where the making of the
Offer or the acceptance of Shares is prohibited by any applicable law. If
Purchaser becomes aware of any jurisdiction where the making of the Offer or the
acceptance of Shares is not in compliance with any applicable law, Purchaser
will make a good faith effort to comply with such law. If, after such good faith
effort, Purchaser cannot comply with such law, the Offer will not be made to
(nor will tenders be accepted from or on behalf of) the holders of Shares in
such jurisdiction. In any jurisdiction where the securities, blue sky or other
laws require the Offer to be made by a licensed broker or dealer,  the Offer
shall be deemed to be made on behalf of Purchaser by J.P. Morgan Securities Inc.
as the Dealer Manager of the Offer or one or more registered brokers or dealers
licensed under the laws of such jurisdiction.

Notice of Offer to Purchase for Cash
All of the Outstanding Shares of Common Stock
(Including the Associated Preferred Stock Purchase Rights)
and
All of the Outstanding Shares of
Series B ESOP Convertible Preferred Stock
of
Nalco Chemical Company
at
$53.00 Net Per Share of Common Stock
and
$1,060.00 Net Per Share of
Series B ESOP Convertible Preferred Stock
by
H2O Acquisition Co.
A Wholly Owned Subsidiary of
Suez Lyonnaise des Eaux

H2O Acquisition Co., a Delaware corporation ("Purchaser"), and a wholly owned
subsidiary of Suez Lyonnaise des Eaux, a societe anonyme organized and existing
under the laws of the Republic of France ("Parent"), is offering to purchase (i)
all of the issued and outstanding shares of common stock, par value $0.1875 per
share, including the associated preferred stock purchase rights (the "Common
Stock"), at a price of $53.00 per share of Common Stock of Nalco Chemical
Company, a Delaware corporation (the "Company"), net to the seller in cash,
without interest thereon, (the "Common Stock Offer Price"), and (ii) all of the
issued and outstanding shares of Series B ESOP Convertible Preferred Stock (the
"ESOP Preferred Stock") of the Company at a price of $1,060.00 per share of ESOP
<PAGE>

Preferred Stock, net to the seller in cash, without interest thereon (the "ESOP
Preferred Stock Offer Price", and, together with the Common Stock Offer Price,
the "Offer Price"), upon the terms and subject to the conditions set forth in
the Offer to Purchase, dated July 1, 1999 (the "Offer to Purchase"), and in the
related Letter of Transmittal (which, as they may be amended and supplemented
from time to time, together constitute the "Offer"). "Shares" shall include both
the shares of Common Stock and the shares of ESOP Preferred Stock.

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
TIME, ON FRIDAY, JULY 30, 1999, UNLESS THE OFFER IS EXTENDED.

The Offer is conditioned upon, among other things, (i) there being validly
tendered and not withdrawn prior to the expiration of the Offer at least such
number of Shares which, when added to any shares of Common Stock already owned
by Parent, constitute a majority of the then outstanding shares of Common Stock
on a fully diluted basis (including, without limitation, all shares of Common
Stock issuable upon the conversion of the ESOP Preferred Stock or any other
convertible securities or upon the exercise of any options, warrants or rights)
(the "Minimum Condition"), (ii) the satisfaction of the HSR Condition(as defined
herein) and (iii) the satisfaction of the EC Condition (as defined herein). The
Offer is also conditioned upon the satisfaction of certain other terms and
conditions described in Section 14 of the Offer to Purchase.
The Company has informed Purchaser that, as of June 24, 1999, there were (x)
66,263,894 shares of Common Stock issued and outstanding, (y) stock options
issued under the Company's stock option plans covering not more than 10,888,271
shares of Common Stock (with an exercise price less than $53.00 per Share), and
(z) 353,908.409 shares of ESOP Preferred Stock issued and outstanding. As a
result, as of such date, the Minimum Condition would be satisfied if at least
42,115,167 shares of Common Stock were validly tendered and not properly
withdrawn prior to the Expiration Date (as defined herein).
The Offer is being made pursuant to an Agreement and Plan of Merger, dated as of
June 27, 1999 (the "Merger Agreement"), among Parent, Purchaser and the Company.
The Merger Agreement provides that, as promptly as practicable after
consummation of the Offer,  Purchaser will be merged with and into the Company
(the "Merger"). At the effective time of the Merger (the "Effective Time"),
except for (a) Shares which are held by any subsidiary of the Company or in the
treasury of the Company, or which are held, directly or indirectly, by Parent or
any direct or indirect subsidiary of Parent (including Purchaser), all of which
shall be canceled without any conversion thereof and no payment or distribution
shall be made with respect thereto and (b) Shares held by holders exercising
their rights to dissent in accordance with Delaware law, (i) each share of
Common Stock (including all associated Preferred Stock purchase rights) issued
and outstanding immediately prior to the Effective Time shall be canceled and
shall be converted automatically
<PAGE>

into the right to receive an amount in cash equal to $53.00, without interest;
and (ii) each share of ESOP Preferred Stock issued and outstanding immediately
prior to the Effective Time shall be canceled and shall be converted
automatically into the right to receive an amount in cash equal to $1,060.00,
without interest. The Merger Agreement is more fully described in Section 11 of
the Offer to Purchase.
The Board of Directors of the Company has duly adopted resolutions that (i)
determined that the Merger is advisable and that the Merger Agreement and the
transactions contemplated thereby, including the Offer and the Merger, are fair
to and in the best interests of the holders of Shares (the "Holders"), (ii)
approved and adopted the Merger Agreement and the transactions contemplated
thereby, and (iii) recommended the acceptance of the Offer, and if required by
applicable law or otherwise, the approval of the Merger and the approval and
adoption of the Merger Agreement by the stockholders of the Company.
Tendering Holders whose Shares are registered in their own name and who tender
directly to First Chicago Trust Company of New York, as Depositary (the
"Depositary"),  will not be obligated to pay brokerage fees or commissions or,
except as set forth in Instruction 6 of the Letter of Transmittal, stock
transfer taxes on the purchase of Shares pursuant to the Offer.
For purposes of the Offer, Purchaser will be deemed to have accepted for payment
(and thereby purchased) Shares validly tendered and not properly withdrawn if,
as and when Purchaser gives oral or written notice to the Depositary of
Purchaser's acceptance for payment of such Shares. Upon the terms and subject to
the conditions of the Offer, payment for Shares accepted pursuant to the Offer
will be made by deposit of the purchase price therefor with the Depositary,
which will act as agent for tendering Holders for the purpose of receiving
payments from Purchaser and transmitting payments to such tendering Holders
whose Shares have been accepted for payment. In all cases, payment for Shares
purchased pursuant to the Offer will be made only after timely receipt by the
Depositary of (i) the certificates evidencing such Shares or timely confirmation
of a book-entry transfer of such Shares into the Depositary's account at the
Book-Entry Transfer Facility (as defined in Section 2 of the Offer to Purchase),
pursuant to the procedures set forth in Section 3 of the Offer to Purchase, (ii)
the Letter of Transmittal (or a copy thereof), properly completed and duly
executed with any required signature guarantees, or an Agent's Message (as
defined in Section 2 of the Offer to Purchase) in connection with a book-entry
transfer and (iii) any other documents required to be included with the Letter
of Transmittal under the terms and subject to the conditions thereof and to the
Offer to Purchase. Under no circumstances will interest on the purchase price
for Shares be paid by Purchaser, regardless of any delay  in making such payment
or extension of the Expiration Date.
The term "Expiration Date" means 12:00 midnight, New York City time, on Friday,
July 30, 1999, unless and until Purchaser, in its sole discretion (but subject
to the terms of the Merger Agreement), shall have extended the period of time
during which the Offer is open, in which event the term "Expiration Date" shall
mean the latest time and date at which the Offer, as so extended by the
Purchaser, shall
<PAGE>

expire. Subject to the terms of the Merger Agreement and to the applicable rules
and regulations of the Securities and Exchange Commission (the "Commission") and
to applicable law, Purchaser expressly reserves the right, in its sole
discretion, at any time or from time to time, to extend for any reason the
period of time during which the Offer is open, including upon the occurrence of
any of the events specified in Section 14 of the Offer to Purchase, by giving
notice of such extension to the Depositary and by making a public announcement
thereof.
Subject to the terms of the Merger Agreement and the applicable rules and
regulations of the Commission and to applicable law, Purchaser expressly
reserves the right, in its sole discretion, at any time and from time to time,
to extend for any reason the period of time during which the Offer is open,
including upon the occurrence of any of the events specified in Section14 of the
Offer to Purchase, by giving notice of such extension to the Depositary and by
making a public announcement thereof. There can be no assurance that Purchaser
will exercise its right to extend the Offer. During any such extension, all
Shares previously tendered and not withdrawn will remain subject to the Offer,
subject to the rights of a tendering Holder to withdraw its Shares.
Subject to the applicable rules and regulations of the Commission and to
applicable law, Purchaser also expressly reserves the right, in its sole
discretion (subject to the terms of the Merger Agreement), at any time and from
time to time (i) to delay acceptance for payment of, or, regardless of whether
such Shares were theretofore accepted for payment, payment for any Shares (a) if
the HSR Condition has not been satisfied, (b) the EC Condition has not been
satisfied or (c) in order to comply in whole or in part with any other
applicable law, (ii) to terminate the Offer and not accept for payment any
Shares if any of the conditions referred to in Section 14 of the Offer to
Purchase are not satisfied or any of the events specified in Section 14 of the
Offer to Purchase have occurred and (iii) subject to the terms of the Merger
Agreement, to waive any condition or otherwise amend the Offer in any respect by
giving oral or written notice of such delay, termination, waiver or amendment to
the Depositary and by making a public announcement thereof, provided however,
that,  subject to the terms of the Merger Agreement, without the prior written
consent of the Company, Purchaser will not (i) waive the Minimum Condition, (ii)
decrease the price per Share payable in the Offer, (iii) reduce the maximum
number of Shares to be purchased in the Offer, (iv) amend or add to the
conditions to the Offer set forth in Section 14 of the Offer, (v) extend the
Offer, (vi) change the form of consideration payable in the Offer, or (vii)
amend, add to or waive any other terms of the Offer in any manner which would be
adverse to the company or the Holders.
"HSR Condition" means the expiration or termination of any applicable waiting
period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, and any extension thereof. "EC Condition" means, if required by
applicable law, the receipt prior to the Expiration Date of a decision of the
Commission of the European Community that the purchase of the Common Stock
pursuant to the Offer and the Merger are compatible with the Common Market.
During any such extension, all Shares previously tendered and not withdrawn will
<PAGE>

remain subject to the Offer, subject to the right of a tendering Holder to
withdraw its Shares. Any such extension, delay, termination, waiver or amendment
will be followed, as promptly as practicable, by public announcement thereof by
no later than 9:00 a.m., New York City time, on the next business day after the
previously scheduled Expiration Date. Subject to applicable law (including Rules
14d-4(c),14d-6(d) and 14e-l under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), which require that material changes be promptly
disseminated to Holders in a manner reasonably designed to inform them of such
changes) and without limiting the manner in which Purchaser may choose to make
any public announcement, Purchaser will have no obligation to publish, advertise
or otherwise communicate any such public announcement other than by issuing a
press release to the Dow Jones News Service or as otherwise may be required by
applicable law.
Except as otherwise provided below, tenders of Shares made pursuant to the Offer
are irrevocable. Shares tendered pursuant to the Offer may be withdrawn at any
time prior to the Expiration Date and, unless theretofore accepted for payment
by Purchaser pursuant to the Offer, may also be withdrawn at any time after
August 30, 1999, or at such later time as may apply if the Offer is extended.
For a withdrawal to be effective, a written or facsimile transmission notice of
withdrawal must be timely received by the Depositary at one of its addresses set
forth below. Any such notice of withdrawal must specify the name of the person
who tendered the Shares to be withdrawn, the number of Shares to be withdrawn
and the name of the registered holder of such Shares, if different from that of
the person who tendered such Shares. If certificates evidencing Shares to be
withdrawn have been delivered or otherwise identified to the Depositary, then,
prior to the physical release of such certificates, the serial numbers shown on
such certificates must be submitted to the Depositary and the signature(s) on
the notice of withdrawal must be guaranteed by an Eligible Institution (as
defined in Section 3 of the Offer to Purchase), unless such Shares have been
tendered for the account of an Eligible Institution. Shares tendered pursuant to
the procedure for book-entry transfer as set forth in Section 3 of the Offer to
Purchase may be withdrawn only by means of the withdrawal procedures made
available by the Book-Entry Transfer Facility, must specify the name and number
of the account at the Book-Entry Transfer Facility to be credited with the
withdrawn Shares and must otherwise comply with the Book-Entry Transfer
Facility's procedures.
Withdrawals of tendered Shares may not be rescinded without Purchaser's consent
and any Shares properly withdrawn will thereafter be deemed not validly tendered
for purposes of the Offer. All questions as to the form and validity (including
time of receipt) of notices of withdrawal will be determined by Purchaser, in
its sole discretion, which determination will be final and binding. None of
Parent, Purchaser, the Depositary,  the Information Agent, the Dealer Manager or
any other person will be under any duty to give notification of any defects or
irregularities in any notice of withdrawal or incur any liability for failure to
give any such notification. Any Shares properly withdrawn may be re-tendered at
any time prior to the Expiration Date by following any of the procedures
described in Section 3 of the Offer to
<PAGE>

Purchase.
The Company has provided Purchaser with the Company's shareholder lists and
security position listings in respect of the Shares for the purpose of
disseminating the Offer to Purchase, the Letter of Transmittal and other
relevant materials to the Holders. The Offer to Purchase, the Letter of
Transmittal and any other relevant materials will be mailed to record holders of
Shares whose names appear on the Company's list of Holders and will be
furnished, for subsequent transmittal to beneficial owners of Shares, to
brokers, dealers, commercial banks, trust companies and similar persons whose
names, or the names of whose nominees, appear on the Company's list of Holders,
or, where applicable,who are listed as participants in the security position
listing of the Depository Trust Company.
The information required to be disclosed by paragraph (e)(l)(vii) of Rule 14d-6
under the Exchange Act is contained in the Offer to Purchase and is incorporated
herein by reference.
The Offer to Purchase and the related Letter of Transmittal contain important
information that should be read carefully before any decision is made with
respect to the Offer.
Requests for copies of the Offer to Purchase, the related Letter of Transmittal
and other tender offer materials may be directed to the Information Agent as set
forth below, and copies will be furnished promptly at Purchaser's expense.
Questions or requests for assistance may be directed to the Information Agent or
the Dealer Manager as set forth below.
The Information Agent for the Offer is:
MORROW & CO., INC.

445 Park Avenue, 5th Floor
New York, New York 10022
Banks and Brokerage Firms Call: (800) 662-5200

Shareholders Please Call: (800) 566-9061

The Dealer Manager for the Offer is:

J.P. Morgan & Co.

60 Wall Street
New York, New York 10260
(877) 219-8026 (Toll Free)
July 1, 1999

<PAGE>


                                                                  Exhibit (a)(7)


 THIS DOCUMENT IS IMPORTANT AND REQUIRES YOUR IMMEDIATE ATTENTION. If you are
 in any doubt as to the action to be taken, you should seek your own
 financial advice immediately from your own appropriately authorized
 independent financial advisor.

 If you have sold or transferred all of your registered holdings of Shares
 (as defined below), please forward this document and all accompanying
 documents to the stockbroker, bank or other agent through whom the sale or
 transfer was effected, for transmission to the purchaser or transferee.

                         NOTICE OF GUARANTEED DELIVERY
                   (Not to be used for Signature Guarantees)
                     FOR TENDER OF SHARES OF COMMON STOCK
          (Including the Associated Preferred Stock Purchase Rights)
                                      and
              SHARES OF SERIES B ESOP CONVERTIBLE PREFERRED STOCK

                                      of

                            NALCO CHEMICAL COMPANY
                       Pursuant to the Offer to Purchase
                              dated July 1, 1999

                                      by

                             H2O ACQUISITION CO.,
                         A Wholly Owned Subsidiary of
                            SUEZ LYONNAISE DES EAUX

  As set forth under Section 3--"Procedures for Tendering Shares" in the Offer
to Purchase dated July 1, 1999, and any supplements or amendments thereto (the
"Offer to Purchase"), this form (or a copy hereof) must be used to accept the
Offer (as defined in the Offer to Purchase) if (i) certificates representing
shares of either (a) common stock, par value $0.1875 per share, including the
associated preferred stock purchase rights (the "Common Stock"), or (b) Series
B ESOP Convertible Preferred Stock (the "ESOP Preferred Stock" and, together
with the Common Stock, the "Shares" and certificates evidencing such Shares,
the "Certificates") of Nalco Chemical Company, a Delaware corporation (the
"Company"), are not immediately available, (ii) if the procedures for book-
entry transfer cannot be completed on a timely basis, or (iii) time will not
permit Certificates and all other required documents to reach First Chicago
Trust Company of New York (the "Depositary") prior to the Expiration Date (as
defined in Section 1--"Terms of the Offer" of the Offer to Purchase). This
Notice of Guaranteed Delivery may be delivered by hand, by mail or by
overnight courier to the Depositary and must include a signature guarantee by
an Eligible Institution (as defined in Section 3--"Procedures for Tendering
Shares" of the Offer to Purchase) in the form set forth herein. See the
guaranteed delivery procedures described in the Offer to Purchase under
Section 3--"Procedures for Tendering Shares".

                       The Depositary for the Offer is:

                    First Chicago Trust Company of New York

        By Hand:                   By Mail:             By Overnight Courier:
   First Chicago Trust        First Chicago Trust        First Chicago Trust
   Company of New York        Company of New York        Company of New York
 c/o Securities Transfer       Corporate Actions          Corporate Actions
           and                    Suite 4660                 Suite 4680
 Reporting Services Inc.         P.O. Box 2569           14 Wall Street, 8th
 Attn: Corporate Actions    Jersey City, NJ 07303-              Floor
   100 William Street,               2569                New York, NY 10005
        Galleria
   New York, NY 10038

                               For Information:
                     Fax: (201) 222-4720 or (201) 222-4721
                      Confirmation of Fax: (201) 222-4707
<PAGE>

  DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS
SET FORTH DOES NOT CONSTITUTE A VALID DELIVERY.

  This Notice of Guaranteed Delivery is not to be used to guarantee a
signature. If a signature on a Letter of Transmittal is required to be
guaranteed by an Eligible Institution under the instructions thereto, such
signature guarantee must appear in the applicable space provided in the
signature box on the Letter of Transmittal.

Ladies and Gentlemen:

  The undersigned hereby tenders to H2O Acquisition Co., a Delaware
corporation and a wholly owned subsidiary of Suez Lyonnaise des Eaux, a
societe anonyme organized and existing under the laws of the Republic of
France, under the terms and subject to the conditions set forth in the Offer
to Purchase and the related Letter of Transmittal, receipt of each of which is
hereby acknowledged, the number of Shares indicated below pursuant to the
Guaranteed Delivery Procedures described in the Offer to Purchase under
Section 3--"Procedures for Tendering Shares".


 Name of Record Holder(s): ___________________________________________________

 _____________________________________________________________________________

 Address(es): ________________________________________________________________

 _____________________________________________________________________________

 Area Code(s) and Tel. No(s).: _______________________________________________

 Signature(s): _______________________________________________________________

 Date: _______________________________________________________________________


 Number of Shares: ___________________________________________________________

 Certificate Number(s) if available: _________________________________________

 If Shares will be tendered by book-entry transfer check box: [_]

    The Depository Trust Company

    Account Number: ________________________________________________________

                                       2
<PAGE>

                     THE GUARANTEE BELOW MUST BE COMPLETED

                                   GUARANTEE
                   (Not to be used for signature guarantee)

  The undersigned, an Eligible Institution, hereby guarantees that the
undersigned will deliver to the Depositary, at one of its addresses set forth
above, the Certificates representing the Shares tendered hereby, in proper
form for transfer, together with a properly completed and duly executed Letter
of Transmittal or with any required signature guarantees and any other
required documents, all within three New York Stock Exchange Trading Days (as
defined in Section 3--"Procedures for Tendering Shares" of the Offer to
Purchase) after the date hereof.


             Name of Firm:                       Authorized Signature:


 _____________________________________   Name: _______________________________


 _____________________________________   Title: ______________________________


 _____________________________________   Date: _______________________________

 Address: ____________________________

 _____________________________________
                        (Zip
                        Code)

 Area Code and Tel. No.: _____________

NOTE: DO NOT SEND SHARE CERTIFICATES WITH THIS NOTICE OF GUARANTEED DELIVERY;
      SHARE CERTIFICATES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL.

                                       3

<PAGE>

                                                                  Exhibit (a)(8)


            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

Guidelines for Determining the Proper Identification Number to Give the
Payer.-- Social Security numbers have nine digits separated by two hyphens:
i.e. 000-00-0000. Employer identification numbers have nine digits separated by
only one hyphen: i.e. 00-0000000. The table below will help determine the
number to give the payer.

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


<TABLE>
<CAPTION>
                            Give the
                            SOCIAL SECURITY
For this type of account:   number of--
- --------------------------------------------
<S>                         <C>
1. An individual's account  The individual
2. Two or more individuals  The actual owner
   (joint account)          of the account
                            or, if combined
                            funds, the first
                            individual on
                            the account(1)
3. Husband and wife (joint  The actual owner
   account)                 of the account
                            or, if joint
                            funds, either
                            person(1)
4. Custodian account of a   The minor(2)
   minor (Uniform Gift to
   Minors Act)
5. Adult and minor (joint   The adult or, if
   account)                 the minor is the
                            only
                            contributor, the
                            minor(1)
6. Account in the name of   The ward, minor,
   guardian or committee    or incompetent
   for a designated ward,   person(3)
   minor, or incompetent
   person
7.a The usual revocable     The grantor-
   savings trust account    trustee(1)
   (grantor is also
   trustee)
b So-called trust account   The actual
   that is not a legal or   owner(1)
   valid trust under State
   law
8. Sole proprietorship      The owner(4)
   account
- --------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                             Give the EMPLOYER
                             IDENTIFICATION
For this type of account:    number of--
                                           ---
<S>                          <C>
 9. A valid trust, estate,   The legal entity
    or pension trust         (Do not furnish
                             the identifying
                             number of the
                             personal
                             representative
                             or trustee
                             unless the legal
                             entity itself is
                             not designated
                             in the account
                             title.)(5)
10. Corporate account        The corporation
11. Religious, charitable,   The organization
    or educational
    organization account
12. Partnership account      The partnership
    held in the name of the
    business
13. Association, club, or    The organization
    other tax-exempt
    organization
14. A broker or registered   The broker or
    nominee                  nominee
15. Account with the         The public
    Department of            entity
    Agriculture in the name
    of a public entity
    (such as a State or
    local government,
    school district, or
    prison) that receives
    agricultural program
    payments
                                           ---
</TABLE>

(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Circle the ward's, minor's or incompetent person's name and furnish such
    person's social security number.
(4) Show the name of the owner.
(5) List first and circle the name of the legal trust, estate, or pension
    trust.

Note: If no name is circled when there is more than one name, the number will
      be considered to be that of the first name listed.
<PAGE>

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
                                    Page 2
Obtaining a Number
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card, or
Form SS-4, Application for Employer Identification Number, at the local office
of the Social Security Administration or the Internal Revenue Service and
apply for a number.

Payees Exempt from Backup Withholding
Payees specifically exempted from backup withholding on ALL payments include
the following:
 . A corporation.
 . A financial institution.
 . An organization exempt from tax under section 501(a), or an individual
   retirement plan.
 . The United States or any agency or instrumentality thereof.
 . A State, the District of Columbia, a possession of the United States, or
   any subdivision or instrumentality thereof.
 . A foreign government, a political subdivision of a foreign government, or
   any agency or instrumentality thereof.
 . An international organization or any agency, or instrumentality thereof.
 . A registered dealer in securities or commodities registered in the U.S. or
   a possession of the U.S.
 . A real estate investment trust.
 . A common trust fund operated by a bank under section 584(a).
 . An exempt charitable remainder trust, or a non-exempt trust described in
   section 4947(a)(1).
 . An entity registered at all times under the investment Company Act of
   1940.
 . A foreign central bank of issue.
Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
 . Payments to nonresident aliens subject to withholding under section 1441.
 . Payments to partnerships not engaged in a trade or business in the U.S.
   and which have at least one nonresident partner.
 . Payments of patronage dividends where the amount received is not paid in
   money.
 . Payments made by certain foreign organizations.
 . Payments made to a nominee.
Payments of interest not generally subject to backup withholding include the
following:
 . Payments of interest on obligations issued by individuals. Note: You may
   be subject to backup withholding if this interest is $600 or more and is
   paid in the course of the payer's trade or business and you have not
   provided your correct taxpayer identification number to the payer.
 . Payments of tax-exempt interest (including exempt-interest dividends under
   section 852).
 . Payments described in section 6049(b)(5) to nonresident aliens.
 . Payments on tax-free covenant bonds under section 1451.
 . Payments made by certain foreign organizations.
 . Payments made to a nominee.
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND RETURN IT
TO THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE DIVIDENDS,
ALSO SIGN AND DATE THE FORM.
 Certain payments other than interest dividends, and patronage dividends, that
are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under sections 6041, 6041A(a),
6045, and 6050A.
Privacy Act Notice.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to IRS. IRS uses the numbers for identification
purposes. Payers must be given the numbers whether or not recipients are
required to file tax returns. Beginning January 1, 1984, payers must generally
withhold 31% of taxable interest, dividend, and certain other payments to a
payee who does not furnish a taxpayer identification number to a payer.
Certain penalties may also apply.

Penalties
(1) Penalty for Failure to Furnish Taxpayer Identification Number.--If you
fail to furnish your taxpayer identification number to a payer, you are
subject to a penalty of $50 for each such failure unless your failure is due
to reasonable cause and not to willful neglect.
(2) Failure to Report Certain Dividend and Interest Payments.--If you fail to
include any portion of an includible payment for interest, dividends, or
patronage dividends in gross income, such failure will be treated as being due
to negligence and will be subject to a penalty of 5% on any portion of an
under-payment attributable to that failure unless there is clear and
convincing evidence to the contrary.
(3) Civil Penalty for False Information With Respect To Withholding.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
(4) Criminal Penalty for Falsifying Information.--Falsifying certifications or
affirmations may subject you to criminal penalties including fines and/or
imprisonment.
FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL REVENUE
SERVICE.

<PAGE>

                                                                  EXHIBIT (c)(1)



================================================================================


                          AGREEMENT AND PLAN OF MERGER

                                     Among

                            SUEZ LYONNAISE DES EAUX

                              H2O ACQUISITION CO.

                                      and

                             NALCO CHEMICAL COMPANY


                           Dated as of June 27, 1999



================================================================================
<PAGE>

                           Glossary of Defined Terms
                          (Not Part of this Agreement)
                          ----------------------------


Defined Term                                  Location of Definition
- ------------                                  ----------------------

Affiliate.....................................     (S) 9.03(a)
Agreement.....................................     Preamble
Acquisition Proposal..........................     (S) 6.05(a)
Beneficial Owner..............................     (S) 9.03(b)
Blue Sky Laws.................................     (S) 3.05(b)
Board.........................................     Recitals
Business Day..................................     (S) 9.03(c)
Certificate of Merger.........................     (S) 2.02
Certificates..................................     (S) 2.09(b)
Code..........................................     (S) 3.10(a)
Common Stock..................................     Recitals
Company.......................................     Preamble
Company Benefit Plans.........................     (S) 3.10(a)
Company Change of Control Agreement...........     (S) 3.10(d)
Company Preferred Stock.......................     (S) 3.03
Company Stock Option Plans....................     (S) 2.07
Confidentiality Agreement.....................     (S) 6.04(c)
Control.......................................     (S) 9.03(d)
Delaware Law..................................     Recitals
Disclosure Schedule...........................     Introduction to Article III
Dissenting Shares.............................     (S) 2.08
Effective Time................................     (S) 2.02
Environmental Laws............................     (S) 9.03(e)
ERISA.........................................     (S) 3.10(a)
ESOP Preferred Stock..........................     Recitals
Exchange Act..................................     (S) 1.02(b)
Goldman.......................................     (S) 1.02(a)
Governmental Antitrust Authority..............     (S) 6.08(b)
Governmental Order............................     (S) 7.01(c)
Hazardous Substances..........................     (S) 9.03(f)
HSR Act.......................................     (S) 3.05(b)
Holders.......................................     Recitals
Indemnified Parties...........................     (S) 6.07(c)
Indemnification Provisions....................     (S) 6.07(a)
IRS...........................................     (S) 3.10(a)
Junior A Preferred Stock......................     (S) 3.03(a)
Junior C Preferred Stock......................     (S) 2.06(a)
knowledge.....................................     (S) 9.03(g)
<PAGE>

                                       2

known.........................................     (S) 9.03(g)
Material Adverse Effect.......................     (S) 9.03(h)
Material Subsidiary...........................     (S) 9.03(i)
Merger........................................     Recitals
Merger Consideration..........................     (S) 2.06(b)
Minimum Condition.............................     (S) 1.01(a)
Offer.........................................     Recitals
Offer Documents...............................     (S) 1.01(b)
Offer to Purchase.............................     (S) 1.01(b)
Option........................................     (S) 2.07
Parent........................................     Preamble
Paying Agent..................................     (S) 2.09(a)
Payment Fund..................................     (S) 2.09(a)
Permitted Liens...............................     (S) 3.14(b)
Per Common Share Amount.......................     Recitals
Per Preferred Share Amount....................     Recitals
Person........................................     (S) 9.03(j)
Proxy Statement...............................     (S) 3.12
Purchaser.....................................     Preamble
Rights Agreement..............................     (S) 3.14
Schedule 14D-9................................     (S) 1.02(b)
Schedule 14D-1................................     (S) 1.01(b)
SEC...........................................     (S) 9.03(k)
SEC Rules.....................................     (S) 9.03(l)
SEC Reports...................................     (S) 3.07(a)
Securities Act................................     (S) 3.07(a)
Shares........................................     Recitals
Stockholders' Meeting.........................     (S) 6.01(a)
Subsidiary....................................     (S) 9.03(m)
Superior Proposal.............................     (S) 6.05(b)
Surviving Corporation.........................     (S) 2.01
Transactions..................................     (S) 3.04
<PAGE>

                               TABLE OF CONTENTS

                                                         Page

                                   ARTICLE I

                                   THE OFFER

SECTION 1.01.  The Offer...............................................  2
SECTION 1.02.  Company Action..........................................  3

                                  ARTICLE II

                                  THE MERGER

SECTION 2.01.  The Merger..............................................  5
SECTION 2.02.  Effective Time; Closing.................................  5
SECTION 2.03.  Effect of the Merger....................................  5
SECTION 2.04.  Certificate of Incorporation; By-laws...................  5
SECTION 2.05.  Directors and Officers..................................  5
SECTION 2.06.  Conversion of Securities................................  6
SECTION 2.07.  Employee and Director Stock Options.....................  6
SECTION 2.08.  Dissenting Shares.......................................  7
SECTION 2.09.  Surrender of Shares; Stock Transfer Books...............  8
SECTION 2.10.  Merger Without Meeting of Stockholders..................  9

                                  ARTICLE III

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

SECTION 3.01.  Organization and Qualification; Material Subsidiaries... 10
SECTION 3.02.  Certificate of Incorporation and By-laws................ 10
SECTION 3.03.  Capitalization.......................................... 10
SECTION 3.04.  Authority Relative to this Agreement.................... 11
SECTION 3.05.  No Conflict; Required Filings and Consents.............. 11
SECTION 3.06.  Compliance.............................................. 12
SECTION 3.07.  SEC Filings; Financial Statements....................... 12
SECTION 3.08.  Absence of Certain Changes or Events.................... 13
SECTION 3.09.  Absence of Litigation; Joint Ventures................... 14
SECTION 3.10.  Employee Benefit Plans.................................. 14
SECTION 3.11.  Labor Matters........................................... 15
SECTION 3.12.  Offer Documents; Schedule 14D-9; Proxy Statement........ 16
SECTION 3.13.  Taxes................................................... 16
SECTION 3.14.  Rights Agreement........................................ 19
<PAGE>

                                      ii


SECTION 3.15.  Trademarks, Patents and Copyrights...................... 19
SECTION 3.16.  Environmental Matters................................... 19
SECTION 3.17.  Brokers................................................. 20
SECTION 3.18.  Year 2000............................................... 20

                                  ARTICLE IV

            REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

SECTION 4.01.  Corporate Organization.................................. 20
SECTION 4.02.  Authority Relative to this Agreement.................... 20
SECTION 4.03.  No Conflict; Required Filings and Consents.............. 21
SECTION 4.04.  Financing............................................... 21
SECTION 4.05.  Offer Documents; Proxy Statement........................ 21
SECTION 4.06.  Brokers................................................. 22
SECTION 4.07.  Absence of Litigation................................... 22
SECTION 4.08.  No Prior Activities..................................... 22
SECTION 4.09.  Parent Not an Affiliated Shareholder.................... 22

                                   ARTICLE V

                    CONDUCT OF BUSINESS PENDING THE MERGER

SECTION 5.01.  Conduct of Business by the Company Pending the Merger... 23
SECTION 5.02.  Third Party Standstill Agreements and Confidentiality
               Agreements.............................................. 25

                                  ARTICLE VI

                             ADDITIONAL AGREEMENTS

SECTION 6.01.  Stockholders' Meeting...................................  26
SECTION 6.02.  Proxy Statement.........................................  26
SECTION 6.03.  Company Board Representation; Section 14(f).............  26
SECTION 6.04.  Access to Information; Confidentiality..................  27
SECTION 6.05.  No Solicitation.........................................  28
SECTION 6.06.  Employee Benefits Matters...............................  30
SECTION 6.07.  Directors' and Officers' Indemnification and Insurance..  30
SECTION 6.08.  Further Action; Reasonable Best Efforts.................  32
SECTION 6.09.  Public Announcements....................................  32
SECTION 6.10.  Confidentiality Agreement...............................  32
<PAGE>

                                      iii


                                  ARTICLE VII

                           CONDITIONS TO THE MERGER

SECTION 7.01.  Conditions to the Merger................................  33

                                 ARTICLE VIII

                       TERMINATION, AMENDMENT AND WAIVER

SECTION 8.01.  Termination.............................................  33
SECTION 8.02.  Effect of Termination...................................  35
SECTION 8.03.  Fee.....................................................  35
SECTION 8.04.  Amendment...............................................  36
SECTION 8.05.  Waiver..................................................  37

                                  ARTICLE IX

                              GENERAL PROVISIONS

SECTION 9.01.  Non-Survival of Representations, Warranties
               and Agreements..........................................  37
SECTION 9.02.  Notices.................................................  37
SECTION 9.03.  Certain Definitions.....................................  38
SECTION 9.04.  Severability............................................  40
SECTION 9.05.  Entire Agreement; Assignment............................  40
SECTION 9.06.  Parties in Interest.....................................  40
SECTION 9.07.  Governing Law...........................................  41
SECTION 9.08.  Headings................................................  41
SECTION 9.09.  Counterparts............................................  41
SECTION 9.10.  Waiver of Jury Trial....................................  41

ANNEX A

     Conditions to the Offer

ANNEX B

     Employee Benefit Matters
<PAGE>

          AGREEMENT AND PLAN OF MERGER dated as of June 27, 1999 (this
"Agreement") among SUEZ LYONNAISE DES EAUX, a societe anonyme organized under
- ----------
the laws of the Republic of France ("Parent"), H2O ACQUISITION CO., a Delaware
                                     ------
corporation and a wholly owned subsidiary of Parent ("Purchaser"), and NALCO
                                                      ---------
CHEMICAL COMPANY, a Delaware corporation (the "Company").
                                               -------

          WHEREAS, the Boards of Directors of Parent, Purchaser and the Company
have each determined that it is in the best interests of their respective
stockholders for Parent to acquire the Company upon the terms and subject to the
conditions set forth herein; and

          WHEREAS, in furtherance of such acquisition, it is proposed that
Purchaser shall make a cash tender offer (the "Offer") to acquire all the issued
                                               -----
and outstanding shares of (i) the Company's Common Stock, par value $0.1875 per
share (the "Common Stock"), for $53 per share of Common Stock (such amount, or
            ------------
any greater amount per share of Common Stock paid pursuant to the Offer, being
hereinafter referred to as the "Per Common Share Amount") and (ii) the Company's
                                -----------------------
Series B ESOP Convertible Preferred Stock, par value $1.00 per share (the "ESOP
                                                                           ----
Preferred Stock"), for $1060 per share of ESOP Preferred Stock (such amount, or
- ---------------
any greater amount per share of ESOP Preferred Stock paid pursuant to the Offer,
being hereinafter referred to as the "Per Preferred Share Amount"), in each case
                                      --------------------------
net to the seller in cash, upon the terms and subject to the conditions of this
Agreement and the Offer (shares of Common Stock and shares of ESOP Preferred
Stock are hereinafter collectively referred to as "Shares"); and
                                                   ------

          WHEREAS, the Board of Directors of the Company (the "Board") has
                                                               -----
adopted resolutions determining that the Offer and the Merger are fair to and in
the best interests of the holders of the Shares (the "Holders") and recommending
                                                      -------
that the Holders approve the Merger, this Agreement and the other transactions
contemplated hereby and adopt this Agreement and tender their Shares pursuant to
the Offer; and

          WHEREAS, also in furtherance of such acquisition, the Boards of
Directors of Parent, Purchaser and the Company have each approved the merger
(the "Merger") of Purchaser with and into the Company in accordance with the
      ------
General Corporation Law of the State of Delaware ("Delaware Law") following the
                                                   ------------
consummation of the Offer and upon the terms and subject to the conditions set
forth herein;

          NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements herein contained, and intending to be legally bound
hereby, Parent, Purchaser and the Company hereby agree as follows:
<PAGE>

                                       2



                                   ARTICLE I

                                   THE OFFER
                                   ---------

          SECTION 1.01.  The Offer.  (a)  Upon the terms and subject to the
                         ---------
conditions of this Agreement, Purchaser shall commence the Offer as promptly as
reasonably practicable after the date hereof, but in no event later than five
Business Days after the initial public announcement of Purchaser's intention to
commence the Offer.  The initial scheduled expiration date for the Offer shall
be 20 Business Days following the commencement of the Offer.  The obligation of
Purchaser to accept for payment and pay for Shares tendered pursuant to the
Offer shall be subject to the condition (the "Minimum Condition") that there
                                              -----------------
shall have been validly tendered and not withdrawn prior to the expiration of
the Offer at least such number of Shares which, when added to any shares of
Common Stock already owned by Parent, shall constitute a majority of the then
outstanding shares of Common Stock on a fully diluted basis (including, without
limitation, all shares of Common Stock issuable upon the conversion of the ESOP
Preferred Stock and any convertible securities or upon the exercise of any
options, warrants or rights) and also shall be subject to the satisfaction of
the other conditions set forth in Annex A hereto.  The conditions to the Offer
set forth in Annex A hereto are for the benefit of Parent and Purchaser
regardless of the circumstances giving rise to such conditions or, except as
expressly set forth herein, may be waived by Parent and Purchaser in whole or in
part.  Purchaser expressly reserves the right to waive any such condition, to
increase the price per Share payable in the Offer, and to make any other changes
in the terms and conditions of the Offer; provided, however, that without the
                                          --------  -------
prior written consent of the Company, Parent and Purchaser shall not (i) waive
the Minimum Condition, (ii) decrease the price per Share payable in the Offer,
(iii) reduce the maximum number of Shares to be purchased in the Offer, (iv)
amend or add to the conditions to the Offer set forth in Annex A hereto, (v)
extend the Offer, (vi) change the form of consideration payable in the Offer, or
(vii) amend, add to or waive any other term of the Offer in any manner which
would be adverse to the Company or the Holders.  Notwithstanding the foregoing,
Purchaser may, without the consent of the Company, extend the Offer:  (i) if, on
the scheduled expiration date of the Offer, any of the conditions to Purchaser's
obligation to accept for payment and pay for the Shares shall not have been
satisfied or waived, until the fifth Business Day after the date Purchaser
reasonably believes to be the earliest date on which such conditions will be
satisfied; (ii) for any period required by any rule, regulation, interpretation
or position of the SEC or its staff applicable to the Offer; or (iii) from time
to time, for an aggregate period of not more than 10 Business Days (for all such
extensions) beyond the latest expiration date that would be permitted under
clause (i) or (ii) of this sentence.  In addition, if, on the scheduled
expiration date of the Offer, (i) the waiting period under the HSR Act shall not
have expired or been terminated, (ii) the Commission of the European Union shall
not have approved the Transactions under Regulation (EC) No. 4064/89, as
amended, of the Council of the European Union or (iii) a temporary restraining
order prohibiting the purchase of the Shares shall have been issued by a court
of competent jurisdiction in any country in which the Company or its
Subsidiaries have operations material to the Company and its Subsidiaries, taken
as a whole, the
<PAGE>

                                       3

Purchaser shall extend the Offer from time to time until five Business Days
after the expiration or termination of the waiting period under the HSR Act,
such approval of the Commission of the European Union or the lifting of such
temporary restraining order, subject to the right of Parent, Purchaser or the
Company to terminate this Agreement pursuant to the terms hereof. The Per Common
Share Amount and the Per Preferred Share Amount shall be net to the seller in
cash, upon the terms and subject to the conditions of the Offer. Subject to the
terms and conditions of the Offer, Purchaser shall, and Parent shall cause
Purchaser to, pay, as promptly as practicable after expiration of the Offer, for
all Shares validly tendered and not withdrawn.

          (b) As promptly as reasonably practicable on the date of commencement
of the Offer, Purchaser shall file with the SEC (i) a Tender Offer Statement on
Schedule 14D-1 (together with all amendments and supplements thereto, the
"Schedule 14D-1") with respect to the Offer.  The Schedule 14D-1 shall contain
- ---------------
or shall incorporate by reference an offer to purchase (the "Offer to Purchase")
                                                             -----------------
and forms of the related letter of transmittal and any related summary
advertisement (the Schedule 14D-1, the Offer to Purchase and such other
documents, together with all supplements and amendments thereto, being referred
to herein collectively as the "Offer Documents").  The Company and its counsel
                               ---------------
shall be given a reasonable opportunity to review and comment on the Offer
Documents prior to the filing thereof with the SEC.  Parent, Purchaser and the
Company agree to correct promptly any information provided by any of them for
use in the Offer Documents which shall have become false or misleading, and
Parent and Purchaser further agree to take all steps necessary to cause the
Schedule 14D-1 as so corrected to be filed with the SEC and the other Offer
Documents as so corrected to be disseminated to Holders, in each case as and to
the extent required by applicable federal securities laws.  Parent and Purchaser
agree to provide the Company and its counsel with copies of any written comments
Parent, Purchaser or their counsel may receive from the SEC or its staff with
respect to the Offer Documents promptly after receipt of such comments.

          SECTION 1.02.  Company Action.  (a)  The Company hereby approves of
                         --------------
and consents to the Offer and represents that (i) the Board, at a meeting duly
called and held on June 27, 1999, has duly adopted resolutions that (A)
determined that the Merger is advisable and that this Agreement and the
transactions contemplated hereby, including the Offer and the Merger, are fair
to and in the best interests of the Holders, (B) approved and adopted this
Agreement and the transactions contemplated hereby (such approval and adoption
having been made in accordance with the provisions of (S) 203 of Delaware Law),
(C) recommended that the stockholders of the Company accept the Offer, approve
the Merger and approve and adopt this Agreement and the transactions
contemplated hereby and (D) took all other applicable action necessary to render
(x) Section 203 of the General Corporation Law of the State of Delaware and
other state takeover statutes and (y) the Rights Agreement, inapplicable to the
Offer and the Merger, and (ii) Goldman Sachs & Co. ("Goldman") has delivered to
                                                     -------
the Board its opinion (which will be confirmed in writing), as of the date
hereof, that the consideration to be received by the holders of shares of Common
Stock pursuant to each of the Offer and the Merger is fair to the holders of
shares of Common Stock from a financial point of view.  Subject to the fiduciary
<PAGE>

                                       4

duties of the Board under applicable law as determined by the Board in good
faith after receiving advice from independent counsel, the Company hereby
consents to the inclusion in the Offer Documents of the recommendation of the
Board described in the immediately preceding sentence. The Company has advised
Parent that each of its directors and executive officers intends to tender
pursuant to the Offer all Shares owned of record and beneficially by him or her
except to the extent such tender would violate applicable securities laws.

          (b) As soon as reasonably practicable on the date of commencement of
the Offer, the Company shall file with the SEC a Solicitation/Recommendation
Statement on Schedule 14D-9 (together with all amendments and supplements
thereto, the "Schedule 14D-9") containing, subject to the fiduciary duties of
              --------------
the Board under applicable law as determined by the Board in good faith after
receiving advice from experienced, independent counsel, the recommendation of
the Board described in Section 1.02(a) and shall disseminate the Schedule 14D-9
to the extent required by Rule 14d-9 promulgated under the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and any other applicable federal
                              ------------
securities laws. Parent and its counsel shall be given an opportunity to review
and comment upon the Schedule 14D-9 prior to the filing thereof with the SEC.
The Company, Parent and Purchaser agree to correct promptly any information
provided by any of them for use in the Schedule 14D-9 which shall have become
false or misleading, and the Company further agrees to take all steps necessary
to cause the Schedule 14D-9 as so corrected to be filed with the SEC and
disseminated to Holders, in each case as and to the extent required by
applicable federal securities laws.  To the extent practicable, the Company
shall cooperate with Parent and Purchaser in mailing or otherwise disseminating
the Schedule 14D-9 with the Offer Documents to the Company's stockholders.  The
Company agrees to provide Parent and Purchaser and their counsel with any
comments the Company or its counsel may receive from the SEC or its staff with
respect to the Schedule 14D-9 promptly after receipt of such comments.

          (c) The Company shall promptly furnish to Purchaser mailing labels
containing the names and addresses of all record Holders and with security
position listings of Shares held in stock depositories, each as of a recent
date, together with all stockholder lists, other available listings and computer
files containing names, addresses and security position listings of record
holders and beneficial owners of Shares.  The Company shall furnish to Purchaser
such additional information, including, without limitation, updated listings and
computer files of stockholders, mailing labels and security position listings,
and such other assistance as Parent, Purchaser or their agents may reasonably
request.  Subject to the requirements of applicable law, and except for such
steps as are necessary to disseminate the Offer Documents and any other
documents necessary to consummate the Offer or the Merger, Parent and Purchaser
shall hold in confidence the information contained in such labels, listings and
files, shall use such information only in connection with the Offer and the
Merger, and, if this Agreement shall be terminated in accordance with Section
8.01, shall deliver to the Company all copies of such information then in their
possession.
<PAGE>

                                       5

                                  ARTICLE II

                                   THE MERGER
                                   ----------

          SECTION 2.01.  The Merger.  Upon the terms and subject to the
                         ----------
conditions set forth in Article VII, and in accordance with Delaware Law, at the
Effective Time (as hereinafter defined) Purchaser shall be merged with and into
the Company.  As a result of the Merger, the separate corporate existence of
Purchaser shall cease and the Company shall continue as the surviving
corporation of the Merger (the "Surviving Corporation").
                                ---------------------

          SECTION 2.02.  Effective Time; Closing.  As promptly as practicable
                         -----------------------
after the satisfaction or, if permissible, waiver of the conditions set forth in
Article VII, the parties hereto shall cause the Merger to be consummated by
filing this Agreement or a certificate of merger or certificate of ownership and
merger (in either case, the "Certificate of Merger") with the Secretary of State
                             ---------------------
of the State of Delaware, in such form as is required by, and executed in
accordance with, the relevant provisions of Delaware Law (the date and time of
such filing being the "Effective Time").
                       --------------

          SECTION 2.03.  Effect of the Merger.  At the Effective Time, the
                         --------------------
effect of the Merger shall be as provided in the applicable provisions of
Delaware Law.  Without limiting the generality of the foregoing, and subject
thereto, at the Effective Time all the property, rights, privileges, powers and
franchises of the Company and Purchaser shall vest in the Surviving Corporation,
and all debts, liabilities, obligations, restrictions, disabilities and duties
of the Company and Purchaser shall become the debts, liabilities, obligations,
restrictions, disabilities and duties of the Surviving Corporation.

          SECTION 2.04.  Certificate of Incorporation; By-laws.  (a)  At the
                         -------------------------------------
Effective Time, the Restated Certificate of Incorporation of the Company shall
be restated in a form acceptable to Purchaser and shall be the Certificate of
Incorporation of the Surviving Corporation until thereafter amended as provided
by law and such Certificate of Incorporation; provided, however, that such
                                              --------  -------
restated Certificate of Incorporation shall be in accordance with the provisions
of Section 6.07 hereof.

          (b) The By-laws of Purchaser, as in effect immediately prior to the
Effective Time, shall be the By-laws of the Surviving Corporation until
thereafter amended as provided by law, the Certificate of Incorporation of the
Surviving Corporation and such By-laws.

          SECTION 2.05.  Directors and Officers.  The directors of Purchaser
                         ----------------------
immediately prior to the Effective Time shall be the initial directors of the
Surviving Corporation, each to hold office in accordance with the Certificate of
Incorporation and By-laws of the Surviving Corporation, and the officers of the
Company immediately prior to the Effective Time shall be
<PAGE>

                                       6

the initial officers of the Surviving Corporation, in each case until their
respective successors are duly elected or appointed and qualified.

          SECTION 2.06.  Conversion of Securities.  At the Effective Time, by
                         ------------------------
virtue of the Merger and without any action on the part of Parent, Purchaser,
the Company or the holders of any of the following securities:

          (a) Each share of Common Stock issued and outstanding immediately
     prior to the Effective Time (other than any shares of Common Stock to be
     canceled pursuant to Section 2.06(c) and any Dissenting Shares (as
     hereinafter defined)), together with the associated right to purchase
     Company Series C Junior Participating Preferred Stock (the "Junior C
                                                                 --------
     Preferred Stock") pursuant to the Rights Agreement, shall be canceled and
     ---------------
     shall be converted automatically into the right to receive an amount equal
     to the Per Common Share Amount in cash (the "Merger Consideration")
                                                  --------------------
     payable, without interest, to the holder of such share of Common Stock,
     upon surrender, in the manner provided in Section 2.09, of the certificate
     that formerly evidenced such share of Common Stock;

          (b) Each share of ESOP Preferred Stock issued and outstanding
     immediately prior to the Effective Time (other than shares of ESOP
     Preferred Stock to be canceled pursuant to Section 2.06(c)) shall be
     canceled and shall be converted automatically into the right to receive an
     amount in cash equal to the product of the Merger Consideration multiplied
     by the number of shares of Common Stock into which such share of ESOP
     Preferred Stock shall be convertible immediately prior to the Effective
     Time, payable, without interest, to the holder of such share of ESOP
     Preferred Stock, upon surrender, in the manner provided in Section 2.09, of
     the certificate that formerly evidenced such share of ESOP Preferred Stock;

          (c) Each Share held in the treasury of the Company and each Share
     owned by Purchaser, Parent or any direct or indirect wholly owned
     subsidiary of Parent or of the Company immediately prior to the Effective
     Time shall be canceled without any conversion thereof and no payment or
     distribution shall be made with respect thereto; and

          (d) Each share of common stock, par value $.01 per share, of Purchaser
     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 Common Stock, par value $.01 per share, of the
     Surviving Corporation.

          SECTION 2.07.  Employee and Director Stock Options.  (a) The Company
                         -----------------------------------
shall, immediately prior to the Effective Time, (i) terminate the Company Stock
Option Plans (as defined in Section 2.07(b) below) and any other plan, program
or arrangement providing for the issuance, grant or purchase of any other
interest in respect of the capital stock of the Company or any of its
Subsidiaries without prejudice to the holders of Options (as defined in Section
2.07(b)
<PAGE>

                                       7

below), and (ii) amend the provisions of any other Company Benefit Plan, or
related trust or funding vehicle, providing for the issuance, holding, transfer
or grant of any Shares, or any interest in respect of any Shares (collectively
the "Company Stock Plans"), to provide no continuing rights to acquire, hold,
transfer, or grant any Shares or any interest in any Shares. Prior to the
Effective Time, the Company shall cause all amounts currently held as cash in
participant accounts under the Company's Employee Stock Purchase Program to be
returned to the applicable participants and all previously purchased shares of
Common Stock held in such accounts to be distributed to the applicable
participants.

          (b)  Parent and the Company shall take all action necessary to (i)
provide that each option to purchase shares of Common Stock (an "Option")
                                                                 ------
pursuant to the Non-Employee Directors Stock Option Plan, the  Company's
Employee Stock Compensation Plan, the 1990 Stock Option Plan and the 1982 Stock
Option Plan or any stock option agreement to which the Company is a party (the
"Company Stock Option Plans"), which is outstanding immediately prior to the
- ---------------------------
acceptance of the Shares by the Purchaser pursuant to the Offer, shall become
fully exercisable and vested, whether or not previously exercisable or vested,
as of the time of such acceptance and (ii) provide that, with respect to each
such Option, the holder thereof shall be entitled to receive from the Company,
at the time payment is made for the Shares tendered pursuant to the Offer, an
amount in cash in cancellation of such Option equal to the difference between
the Merger Consideration and the per share exercise price of such Option,
multiplied by the number of shares of Common Stock to which such Option remains
unexercised, less any income or employment tax withholding required under the
Code or any provision of state or local law.  Prior to the acceptance of the
Shares by the Purchaser pursuant to the Offer, the Company shall make all
amendments to the Company Stock Plans necessary, and take all actions necessary,
to effect the transactions contemplated by this Section 2.07 and Annex B.  The
Company and the Parent shall cooperate, and take all reasonable steps to share
in advance information, to effect the transactions contemplated by this Section
2.07.

          SECTION 2.08.  Dissenting Shares.  Notwithstanding any provision of
                         -----------------
this Agreement to the contrary, Shares that are outstanding immediately prior to
the Effective Time and which are held by stockholders who shall have not voted
in favor of the Merger or consented thereto in writing and who shall have
demanded properly in writing an appraisal for such Shares in accordance with
Section 262 of Delaware Law (collectively, the "Dissenting Shares") shall not be
                                                -----------------
converted into or represent the right to receive the Merger Consideration.  Such
stockholders shall be entitled to receive payment of the appraised value of such
Shares held by them in accordance with the provisions of such Section 262,
except that all Dissenting Shares held by stockholders who shall have failed to
perfect or who effectively shall have withdrawn or lost their rights to
appraisal of such Shares under such Section 262 shall thereupon be deemed to
have been converted into and to have become exchangeable for, as of the
Effective Time, the right to receive the Merger Consideration, without any
interest thereon, upon surrender, in the manner provided in Section 2.09 of the
certificate or certificates that formerly evidenced such Shares. The Company
will give Parent and Purchaser (i) prompt notice of any written demands for
<PAGE>

                                       8

appraisal, withdrawals of demands for appraisal and any other related
instruments received by the Company, and (ii), after the acceptance of the
Shares by Purchaser pursuant to the Offer, the opportunity to direct all
negotiations and proceedings with respect to demands for appraisal.  The Company
will not, except with the prior written consent of Parent, voluntarily make any
payment with respect to any demands for appraisal or settle or offer to settle
any such demand.

          SECTION 2.09.  Surrender of Shares; Stock Transfer Books.  (a)  As of
                         -----------------------------------------
the Effective Time, Purchaser shall deposit (and Parent shall provide all
necessary funds and otherwise cause Purchaser to deposit), or shall cause to be
deposited, with a bank or trust company designated by Parent or Purchaser (and
reasonably satisfactory to the Company) to act as its paying agent (the "Paying
                                                                         ------
Agent"), for the benefit of the Holders, for payment in accordance with this
- -----
Article II, through the Paying Agent, cash in an amount equal to the sum of (i)
the Per Common Share Amount multiplied by the number of shares of Common Stock
outstanding immediately prior to the Effective Time plus (ii) the Per Preferred
                                                    ----
Share Amount multiplied by the number of shares of ESOP Preferred Stock
outstanding immediately prior to the Effective Time (such cash being hereinafter
referred to as the "Payment Fund").  The Paying Agent shall, pursuant to
                    ------------
irrevocable instructions, deliver the cash contemplated to be paid pursuant to
this Article II out of the Payment Fund.  The Payment Fund shall not be used for
any other purpose.  The Payment Fund shall be invested by the Paying Agent as
directed by the Surviving Corporation, provided that such investments shall be
in obligations of or guaranteed by the United States of America or of any agency
thereof and backed by the full faith and credit of the United States of America,
in commercial paper obligations rated A-1 or P-1 or better by Moody's Investors
Service, Inc. or Standard & Poor's Rating Services, respectively, or in deposit
accounts, certificates of deposit or banker's acceptances of, repurchase or
reverse repurchase agreements with, or Eurodollar time deposits purchased from,
commercial banks with capital, surplus and undivided profits aggregating in
excess of $1 billion (based on the most recent financial statements of such bank
which are then publicly available at the SEC or otherwise).

          (b) Promptly after the Effective Time, the Surviving Corporation shall
cause to be mailed to each person who was, at the Effective Time, a holder of
record of Shares entitled to receive the Merger Consideration pursuant to
Sections 2.06(a) and 2.06(b) a form of letter of transmittal (which shall
specify that delivery shall be effected, and risk of loss and title to the
certificates evidencing such Shares (the "Certificates") shall pass, only upon
                                          ------------
proper delivery of the Certificates to the Paying Agent) and instructions for
use in effecting the surrender of the Certificates pursuant to such letter of
transmittal.  Upon surrender to the Paying Agent of a Certificate, together with
such letter of transmittal, duly completed and validly executed in accordance
with the instructions thereto, and such 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
evidenced by such Certificate, and such Certificate shall then be canceled.  No
interest shall accrue or be paid on the Merger Consideration payable upon the
surrender of any Certificate for the benefit of the holder of such Certificate.
If payment of the Merger Consideration is to be made to a person other than the
<PAGE>

                                       9

person in whose name the surrendered Certificate is registered on the stock
transfer books of the Company, it shall be a condition of payment that the
Certificate so surrendered shall be endorsed properly or otherwise be in proper
form for transfer and that the person requesting such payment shall have paid
all transfer and other taxes required by reason of the payment of the Merger
Consideration to a person other than the registered holder of the Certificate
surrendered or shall have established to the satisfaction of the Surviving
Corporation that such taxes either have been paid or are not applicable.

          (c) At any time following the first anniversary of the Effective Time,
the Surviving Corporation shall be entitled to require the Paying Agent to
deliver to it any funds which had been made available to the Paying Agent and
not disbursed to Holders (including, without limitation, all interest and other
income received by the Paying Agent in respect of all funds made available to
it), and thereafter such Holders shall be entitled to look to the Surviving
Corporation (subject to abandoned property, escheat and other similar laws) only
as general creditors thereof with respect to any Merger Consideration that may
be payable.  Notwithstanding the foregoing, neither the Surviving Corporation
nor the Paying Agent shall be liable to any holder of a Share for any Merger
Consideration delivered in respect of such Share to a public official pursuant
to any abandoned property, escheat or other similar law.

          (d) At the close of business on the day of the Effective Time, the
stock transfer books of the Company shall be closed and thereafter there shall
be no further registration of transfers of Shares on the records of the Company.
From and after the Effective Time, the Holders outstanding immediately prior to
the Effective Time shall cease to have any rights with respect to such Shares
except as otherwise provided herein or by applicable law.

          SECTION 2.10.  Merger Without Meeting of Stockholders.
                         --------------------------------------
Notwithstanding the foregoing, in the event that Purchaser, or any other direct
or indirect subsidiary of Parent, shall acquire at least 90 percent of the
outstanding Shares, the parties hereto agree to take all necessary and
appropriate action to cause the Merger to become effective as soon as
practicable after the expiration of the Offer without a meeting of stockholders
of the Company, in accordance with Section 253 of Delaware Law.

                                  ARTICLE III

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                 ---------------------------------------------

          Except as set forth in the disclosure schedule (the "Disclosure
                                                               ----------
Schedule") delivered by the Company to Parent and Purchaser on or prior to the
- --------
date of this Agreement or as disclosed in any of the SEC Reports, the Company
hereby represents and warrants to Parent and Purchaser that:
<PAGE>

                                       10

          SECTION 3.01.  Organization and Qualification; Material Subsidiaries.
                         -----------------------------------------------------
Each of the Company and each Material Subsidiary is duly organized, validly
existing and in good standing under the laws of its jurisdiction of organization
and has the requisite power and authority and all necessary governmental
approvals to own, lease and operate its properties and to carry on its business
as it is now being conducted, except where the failure to be so organized,
existing or in good standing or to have such power, authority and governmental
approvals does not, individually or in the aggregate, have a Material Adverse
Effect.  Each of the Company and each Material Subsidiary is duly qualified or
licensed as a foreign corporation to do business, and is in good standing, in
each jurisdiction where the character of the properties owned, leased or
operated by it or the nature of its business makes such qualification or
licensing necessary, except for such failures to be so qualified or licensed and
in good standing that do not, individually or in the aggregate, have a Material
Adverse Effect.  Exhibit 21 to the Company's Annual Report on Form 10-K for the
year ended December 31, 1998, as filed with the SEC, is a true, accurate and
correct list of all of the Subsidiaries of the Company.  All of the outstanding
capital stock of, or ownership interests in, each Subsidiary of the Company is
owned by the Company, directly or indirectly, free and clear of all liens.  All
of the shares of capital stock of each Subsidiary are validly issued, fully paid
and non-assessable.

          SECTION 3.02.  Certificate of Incorporation and By-laws.  The Company
                         ----------------------------------------
has heretofore made available to Parent a complete and correct copy of the
Restated Certificate of Incorporation and the By-laws, each as amended to date,
of the Company.  Such Restated Certificate of Incorporation and By-Laws are in
full force and effect, and the Company is not in material violation of any
provision thereof.

          SECTION 3.03.  Capitalization.  The shares of issued and outstanding
                         --------------
capital stock of the Company have been duly authorized and validly issued and
are fully paid and nonassessable; none of the outstanding shares of capital
stock of the Company was issued in violation of the preemptive or other similar
rights of any security holder of the Company.  The authorized capital stock of
the Company consists of 200,000,000 shares of Common Stock and 2,000,000 shares
of preferred stock of the Company ("Company Preferred Stock"), par value $1.00
                                    -----------------------
per share (of which 450,000 shares have been designated Series A Junior
Participating Preferred Stock ("Junior A Preferred Stock"), 415,800 have been
                                ------------------------
designated as ESOP Preferred Stock and 200,000 have been designated Junior C
Preferred Stock).  As of June 24, 1999, (i) 66,263,894 shares of Common Stock
and 353,908.409 shares of ESOP Preferred are issued and outstanding, all of
which are validly issued, fully paid and nonassessable, and no shares of Junior
A Preferred Stock or of Junior C Preferred Stock are issued and outstanding,
(ii) 14,023,674 shares of Common Stock and no shares of Company Preferred Stock
are held in the treasury of the Company, (iii) no shares of Common Stock and no
shares of Company Preferred Stock are held by the Subsidiaries, (iv) no shares
of Common Stock and no shares of Company Preferred Stock are reserved for
issuance pursuant to currently outstanding stock options granted pursuant to the
Company's Stock Option Plans, (v) no shares of Common Stock and no shares of
Company Preferred Stock are reserved for issuance pursuant to stock options to
be granted
<PAGE>

                                       11

pursuant to the Company's Stock Option Plans and (vi) 200,000 shares of Junior C
Preferred Stock are reserved for issuance pursuant to the Rights Agreement. All
of the outstanding shares of ESOP Preferred Stock are held by the Company's
employee stock ownership plan. Except as set forth in this Section 3.03, in the
Restated Certificate of Incorporation of the Company or for the rights to
purchase Junior C Preferred Stock pursuant to the Rights Agreement, neither the
Company nor any Subsidiary has granted any options, warrants or other rights, or
entered into any agreements, arrangements or commitments of any character
relating to the issued or unissued capital stock of the Company or any
Subsidiary or obligating the Company or any Subsidiary to issue or sell any
shares of capital stock of, or other equity interests in, the Company or any
Subsidiary. All Shares subject to issuance as aforesaid, 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.
The total number of Options outstanding is no greater than 10,888,271 and the
weighted average exercise price is no less than $34.27. There are no outstanding
contractual obligations of the Company or any Subsidiary to provide funds to, or
make any investment (in the form of a loan, capital contribution or otherwise)
in, any Subsidiary or any other person other than to Subsidiaries in the
ordinary course of business consistent with past practice.

          SECTION 3.04.  Authority Relative to this Agreement.  The Company has
                         ------------------------------------
all necessary corporate power and authority to execute and deliver this
Agreement, to perform its obligations hereunder and to consummate the
transactions contemplated hereby (the "Transactions").  The execution and
                                       ------------
delivery of this Agreement by the Company and the consummation by the Company of
the Transactions have been duly and validly authorized by all necessary
corporate action, and no other corporate proceedings on the part of the Company
are necessary to authorize this Agreement or to consummate the Transactions
(other than, with respect to the Merger, the approval and adoption of this
Agreement by the holders of a majority of the votes cast by the holders of the
then outstanding shares of Common Stock and shares of ESOP Preferred Stock,
voting together as a single class, if and to the extent required by applicable
law, and the filing and recordation of appropriate merger documents as required
by Delaware Law).  This Agreement has been duly and validly executed and
delivered by the Company and, assuming the due authorization, execution and
delivery by Parent and Purchaser, constitutes a legal, valid and binding
obligation of the Company enforceable against the Company in accordance with its
terms.

          SECTION 3.05.  No Conflict; Required Filings and Consents.  (a)  The
                         ------------------------------------------
execution and delivery of this Agreement by the Company does not, and the
performance of this Agreement by the Company will not, (i) conflict with or
violate the Certificate of Incorporation or By-laws or equivalent organizational
documents of the Company or any Material Subsidiary, (ii) conflict with or
violate any law, rule, regulation, order, judgment or decree applicable to the
Company or any Material Subsidiary or by which any property or asset of the
Company or any Material Subsidiary is bound or affected other than conflicts or
violations that do not, individually or in the aggregate, have a Material
Adverse Effect or prevent the consummation of any of the
<PAGE>

                                       12

Transactions, or (iii) result in any breach of or constitute a default (or an
event which with notice or lapse of time or both would become a default) under,
or give to others any right of termination, amendment, acceleration or
cancellation of, or result in the creation of a lien or other encumbrance on any
property or asset of the Company or any Material Subsidiary pursuant to, any
note, bond, mortgage, indenture, contract, agreement, lease, license, permit,
franchise or other instrument or obligation, other than breaches or defaults
that do not, individually or in the aggregate, have a Material Adverse Effect or
prevent the consummation of any of the Transactions or prohibit or materially
limit the operation by Parent or Purchaser of all or any material portion of the
business of the Company and its Subsidiaries, taken as a whole.

          (b) The execution and delivery of this Agreement by the Company do
not, and the performance of this Agreement by the Company will not, require any
consent, approval, authorization or permit of, or filing or registration with or
notification to, any governmental or regulatory authority, domestic or foreign,
with respect to the Company or any of its Subsidiaries, except (i) for
applicable requirements, if any, of the Exchange Act, state securities or "blue
sky" laws ("Blue Sky Laws") and state takeover laws, the pre-merger notification
            -------------
requirements of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, and the rules and regulations thereunder (the "HSR Act"), the filing of
                                                        -------
a notification with the European Commission under Council Regulation (EC) No.
4064/89, as amended, or similar antitrust filings or notifications in other
jurisdictions and filing and recordation of appropriate merger documents as
required by Delaware Law and (ii) where failure to obtain such consents,
approvals, orders, registrations, authorizations or permits, or to make such
filings or notifications, would not prevent or delay consummation of the Offer
or the Merger, or otherwise prevent the Company from performing its obligations
under this Agreement, and do not, individually or in the aggregate, have a
Material Adverse Effect.

          SECTION 3.06.  Compliance.  Neither the Company nor any Material
                         ----------
Subsidiary is in conflict with, or in default or violation of, (i) any law,
rule, regulation, order, judgment or decree applicable to the Company or any
Material Subsidiary or by which any property or asset of the Company or any
Material Subsidiary is bound or affected, or (ii) any note, bond, mortgage,
indenture, contract, agreement, lease, license, permit, franchise or other
instrument or obligation to which the Company or any Material Subsidiary is a
party or by which the Company or any Material Subsidiary or any property or
asset of the Company or any Material Subsidiary is bound or affected, except for
any such conflicts, defaults or violations that do not, individually or in the
aggregate, have a Material Adverse Effect.

          SECTION 3.07.  SEC Filings; Financial Statements.  (a)  The Company
                         ---------------------------------
has filed all forms, reports and documents required to be filed by it with the
SEC since January 1, 1998 and has heretofore made available to Parent, in the
form filed with the SEC, (i) the Company's Annual Reports on Form 10-K for the
fiscal years ended December 31, 1997 and 1998, (ii) the Company's Quarterly
Report on Form 10-Q for the fiscal quarter ended March 31, 1999, (iii) all proxy
statements relating to the Company's meetings of stockholders (whether annual or
special)
<PAGE>

                                       13

held since January 1, 1998, and (iv) all other forms, reports and other
registration statements filed by the Company with the SEC since January 1, 1998
(the forms, reports and other documents referred to in clauses (i), (ii), (iii)
and (iv) above, together with any amendments or supplements thereto, being
referred to herein, collectively, as the "SEC Reports").  The SEC Reports (i)
                                          -----------
were prepared in accordance with the requirements of the Securities Act of 1933,
as amended (the "Securities Act"), and the Exchange Act, as the case may be, and
                 --------------
the rules and regulations thereunder and (ii) did not at the time they were
filed 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 the light of the circumstances under which they were
made, not misleading.  No Subsidiary is required to file any form, report or
other document with the SEC.

          (b) Each of the consolidated financial statements (including, in each
case, any notes thereto) contained in the SEC Reports was prepared in accordance
with generally accepted accounting principles applied on a consistent basis
throughout the periods indicated and each fairly presented, in all material
respects, the consolidated financial position, results of operations and cash
flow of the Company and the Subsidiaries as at the respective dates thereof and
for the respective periods indicated therein (except as otherwise noted therein
and subject, in the case of unaudited statements, to normal and recurring year-
end adjustments).

          (c) Except as and to the extent set forth on the consolidated balance
sheet of the Company and the Subsidiaries as at March 31, 1999, including the
notes thereto, neither the Company nor any Subsidiary has any liability or
obligation of any nature (whether accrued, absolute, contingent or otherwise)
which would be required to be reflected on a balance sheet prepared in
accordance with generally accepted accounting principles, except for liabilities
and obligations that do not, individually or in the aggregate, have a Material
Adverse Effect.

          SECTION 3.08.  Absence of Certain Changes or Events.  From March 31,
                         ------------------------------------
1999 through the date of this Agreement, there has not been (i) any event,
occurrence or condition which, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect, (ii) any amendments or
changes in the Certificate of Incorporation or Bylaws of the Company, (iii) any
revaluation by the Company or any of its Subsidiaries of any of their respective
assets, including, without limitation, write-offs of accounts receivable, other
than in the ordinary course of the Company's and its Subsidiaries' businesses
consistent with historical practices, (iv) any material change by the Company or
any of its Subsidiaries in its accounting methods, principles or practices, (v)
any entry by the Company or any Subsidiary into any contract material to the
Company and the Subsidiaries, taken as a whole, (vi) any declaration, setting
aside or payment of any dividend or distribution in respect of any capital stock
of the Company or any redemption, repurchase or other acquisition of any of its
securities (other than regular quarterly dividends on the shares of Common Stock
and regular dividends on the shares of ESOP Preferred Stock), (vii) any event
pursuant to which the Company or any of its Subsidiaries (A) incurred any
liabilities (direct, contingent or otherwise) which are material to the Company
and its Subsidiaries, taken as a whole, or (B) engaged in any transaction or
entered into
<PAGE>

                                       14

any agreement material to the Company and its Subsidiaries, taken as a whole, in
each of clause (A) and (B) outside of the ordinary course of business, or (viii)
other than pursuant to the contractual arrangements referred to in Section 3.10
and Annex B, any increase in or establishment of any bonus, insurance,
severance, deferred compensation, pension, retirement, profit sharing, stock
option (including, without limitation, the granting of stock options, stock
appreciation rights, performance awards, or restricted stock awards), stock
purchase or other employee benefit plan, or any other increase in the
compensation payable or to become payable to any officers or key employees of
the Company or any Subsidiary, except in the ordinary course of business
consistent with past practice.

          SECTION 3.09.  Absence of Litigation; Joint Ventures.  (a)  As of the
                         -------------------------------------
date of this Agreement, there is no claim, action, proceeding or investigation
pending or, to the knowledge of the Company, threatened against the Company or
any Subsidiary or against Treated Water Outsourcing, a Nalco/U.S. Filter Joint
Venture ("TWO"), or any property or asset of the Company or any Subsidiary or
TWO, before any court, arbitrator or administrative, governmental or regulatory
authority or body, domestic or foreign, that, individually or in the aggregate,
would reasonably be expected to have a Material Adverse Effect.  As of the date
of this Agreement, none of the Company, any Subsidiary or TWO nor any property
or asset of the Company, any Subsidiary or TWO is subject to any order, writ,
judgment, injunction, decree, determination or award that would reasonably be
expected to have, individually or in the aggregate, a Material Adverse Effect.

          (b) As of the date of this Agreement, the aggregate amount of
indebtedness, net of cash and cash equivalents (i) of TWO is not materially
greater than $24,700,000 and (ii) of Nalco/Exxon Energy Chemicals, L.P. is not
materially greater than $6,700,000.

          SECTION 3.10.  Employee Benefit Plans.  (a) With respect to each
                         ----------------------
employee benefit plan, program, arrangement and contract (including, without
limitation, any "employee benefit plan", as defined in Section 3(3) of the
                 ---------------------
Employee Retirement Income Security Act of 1974, as amended ("ERISA")),
                                                              -----
maintained or contributed to by the Company or any Subsidiary, or any
organization which, together with the Company or any Subsidiary, would be
treated as a "single employer" within the meaning of Section 414 of the Code or
Section 4001(a)(14) of ERISA (collectively, the "Company Benefit Plans"), the
                                                 ---------------------
Company has made available to Parent a true and correct copy of (i) the most
recent annual report (Form 5500) filed with the Internal Revenue Service (the
"IRS"), (ii) such Company Benefit Plan, (iii) each trust agreement relating to
- ----
each Company Benefit Plan, (iv) the most recent summary plan description for
each Company Benefit Plan for which a summary plan description is required, (v)
the most recent actuarial report or valuation, if any, relating to a Company
Benefit Plan subject to Title IV of ERISA and (vi) the most recent determination
letter, if any, issued by the IRS with respect to any Company Benefit Plan
qualified under Section 401(a) of the Internal Revenue Code of 1986, as amended
(the "Code").
      ----
<PAGE>

                                       15

          (b) With respect to the Company Benefit Plans, to the knowledge of the
Company, no event has occurred and there exists no condition or set of
circumstances in connection with which the Company or any Subsidiary could be
subject to any liability under the terms of such Company Benefit Plans, ERISA,
the Code or any other applicable law which would have a Material Adverse Effect.

          (c) Except as required by law or as would not have a Material Adverse
Effect, no Company Benefit Plan provides retiree medical or retiree life
insurance benefits to any person.

          (d) The Company has made available to Parent (i) copies of all
material employment agreements with officers of the Company and the Subsidiaries
(or copies of forms of agreements setting forth representative employment terms
and conditions) and (ii) copies of all plans, programs, agreements and other
arrangements of the Company with or relating to its employees which contain
change of control provisions (the "Company Change of Control Agreements").
                                   ------------------------------------

          (e) Except as would not have a Material Adverse Effect, (i) each
Company Benefit Plan which is intended to be "qualified" within the meaning of
Section 401(a) of the Code, has received a favorable determination letter from
the Internal Revenue Service and, to the knowledge of the Company, no event has
occurred and no condition exists which could reasonably be expected to result in
the revocation of any such determination; (ii) during the six year period
preceding the Effective Time, no Company Benefit Plan covered by Title IV of
ERISA has been terminated and no proceedings have been instituted to terminate
or appoint a trustee to administer any such plan; (iii)  during the six year
period preceding the Effective Time, no Company Benefit Plan subject to Section
412 of the Code or Section 302 of ERISA has incurred any accumulated funding
deficiency within the meaning of Section 412 of the Code or Section 302 of
ERISA, or obtained a waiver of any minimum funding standard or an extension of
any amortization period under Section 412 of the Code or Section 303 or 304 of
ERISA; and (iv) no liability, claim, action or litigation has been made,
commenced or, to the Company's knowledge, threatened with respect to any Company
Benefit Plan (other than routine claims for benefits payable in the ordinary
course, and appeals of such denied claims).

          SECTION 3.11.  Labor Matters.  Neither the Company nor any Material
                         -------------
Subsidiary is a party to any collective bargaining or other labor union contract
applicable to persons employed by the Company or a Material Subsidiary in the
United States and no collective bargaining agreement is being negotiated by the
Company or any Material Subsidiary with respect to such United States employees.
As of the date of this Agreement, there is no effort by or on behalf of any
labor union to organize any persons employed by the Company or any Material
Subsidiary in the United States, and, to the knowledge of the Company, no such
effort has been threatened, and no labor dispute, strike or work stoppage
against the Company or any Material Subsidiary pending or, to the knowledge of
the Company, threatened in writing which may interfere with the respective
business activities of the Company or the Material Subsidiaries,
<PAGE>

                                       16

except where such dispute, strike or work stoppage would not have a Material
Adverse Effect. As of the date of this Agreement, to the knowledge of the
Company, none of the Company or any of the Material Subsidiaries, or their
respective representatives or employees, has committed any unfair labor
practices in connection with the operation of the respective businesses of the
Company or the Material Subsidiaries, and there is no charge or complaint
against the Company or the Material Subsidiaries by the National Labor Relations
Board or any comparable state agency pending or threatened in writing, except
where such unfair labor practice, charge or complaint would not have a Material
Adverse Effect.

          SECTION 3.12.  Offer Documents; Schedule 14D-9; Proxy Statement.
                         ------------------------------------------------
Neither the Schedule 14D-9 nor any information supplied by the Company for
inclusion or incorporation by reference in the Offer Documents shall, at the
respective times set out in the Schedule 14D-9, the Offer Documents or any
amendments or supplements thereto that are filed with the SEC or are first
published, sent or given to stockholders of the Company, 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 the
light of the circumstances under which they are made, not misleading.  Neither
the proxy statement to be sent to the stockholders of the Company in connection
with the Stockholders' Meeting (as hereinafter defined) nor the information
statement to be sent to such stockholders, as appropriate (such proxy statement
or information statement, as amended or supplemented, being referred to herein
as the "Proxy Statement"), shall, at the date the Proxy Statement (or any
        ---------------
amendment or supplement thereto) is first mailed to stockholders of the Company,
at the time of the Stockholders' Meeting and at the Effective Time, be false or
misleading with respect to any 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 the light of the circumstances under which they are made, not
misleading or necessary to correct any statement in any earlier communication
with respect to the solicitation of proxies for the Stockholders' Meeting which
shall have become false or misleading.  If, at any time prior to the Effective
Time, any event with respect to the Company, its officers and directors or any
of its Subsidiaries should occur which is required to be described in an
amendment of, or a supplement to, the Schedule 14D-9, the Offer Documents or the
Proxy Statement, such event shall be so described, and such amendment or
supplement shall be promptly filed with the SEC and, as required by law,
disseminated to Holders.  Prior to the filing of such amendment or supplement
with the SEC, a copy thereof will be delivered to Parent and its counsel, who
shall, to the extent practicable under the circumstances and applicable law,
have the opportunity to comment on such amendment or supplement.  The Schedule
14D-9 and the Proxy Statement shall comply in all material respects as to form
with the requirements of the Exchange Act and the rules and regulations
thereunder.

          SECTION 3.13.  Taxes.  (a) The Company and its Subsidiaries have
                         -----
timely filed, or will timely file, all material Tax Returns required to be filed
by, or with respect to, the Company and its Subsidiaries on or before the
Effective Time (taking into account proper extensions of time to file), which
Tax Returns are true and complete in all material respects.  All material Taxes
which are due and payable by the Company or any of its Subsidiaries as of the
<PAGE>

                                       17

date of this Agreement have been timely paid or have been adequately disclosed
and fully provided for as a liability on the financial statements of the Company
and its Subsidiaries in accordance with generally accepted accounting
principles, consistently applied.  All material Taxes which are not yet due and
payable, but become due and payable by the Company or any of its Subsidiaries on
or before the Effective Time, will be timely paid or will be adequately
disclosed and fully provided for, on or before the Effective Time, as a
liability on the financial statements of the Company and its Subsidiaries in
accordance with generally accepted accounting principles, consistently applied.
The Company and each Subsidiary have withheld and collected all material Taxes
that are required to be withheld and collected by them as of the date of this
Agreement and have timely paid to the proper authorities such Taxes withheld and
collected to the extent due and payable.  The Company and each Subsidiary will
withhold and collect on or before the Effective Time all material Taxes that
will be required to be withheld and collected by them on or before the Effective
Time and will timely pay to the proper authorities such Taxes withheld and
collected to the extent due and payable on or before the Effective Time.

          (b) Neither the Company nor any of its Subsidiaries has waived or been
requested to waive any statute of limitations in respect of material Taxes of
the Company or any of its Subsidiaries.  Neither the Internal Revenue Service
nor any other taxing authority (domestic or foreign) is now asserting or, to the
knowledge of the Company, threatening to assert against the Company or any
Subsidiary any deficiency or claim for material additional Taxes.  No liens or
security interests arising in connection with a failure (or alleged failure) to
pay any material Taxes have attached to any of the assets of the Company or any
of its Subsidiaries, except for Taxes that are being contested in good faith
through proper proceedings.

          (c) Neither the Company nor any of its Subsidiaries has any liability
for material Taxes of any person (other than the Company and its Subsidiaries),
including liability arising from the application of Treasury regulation section
1.1502-6 or any analogous provision of state, local or foreign law, or as a
transferee or successor, by contract or otherwise, other than a liability for
which any person (other than the Company and its Subsidiaries) is required, by
contract or otherwise, to indemnify the Company or any of its Subsidiaries, and
other than a liability which is adequately disclosed and fully provided for on
the financial statements of the Company and its Subsidiaries in accordance with
generally accepted accounting principles, consistently applied.  To the
knowledge of the Company, no person or taxing authority has asserted liability
against the Company or any of its Subsidiaries for material Taxes of any person
(other than the Company and its Subsidiaries), including liability arising from
the application of Treasury regulation section 1.1502-6 or any analogous
provision of state, local or foreign law, or as a transferee or successor, by
contract or otherwise.

          (d) There are no tax sharing, allocation, indemnification or similar
agreements in effect as between the Company or its Subsidiaries or any
predecessor or affiliate thereof and any other party under which Parent or
Purchaser, the Company or its Subsidiaries could be liable for material Taxes or
other material claims of any party (other than the Company or its
<PAGE>

                                       18

Subsidiaries), other than Taxes or other claims which are adequately disclosed
and fully provided for on the financial statements of the Company and its
Subsidiaries in accordance with generally accepted accounting principles,
consistently applied.

          (e) No election under Section 341(f) of the Code has been made or
shall be made prior to the Effective Time to treat the Company or any of its
Subsidiaries as a consenting corporation, as defined in Section 341 of the Code.

          (f) The Company is not a "United States real property holding
corporation" within the meaning of Section 897(c)(2) of the Code.

          (g) Neither the Company nor any of its Subsidiaries has applied for,
been granted, been required to make, or agreed to any accounting method change
for which it will be required to take into account any material adjustment under
Section 481 of the Code or any similar provision of the Code or the
corresponding tax laws of any nation, state or locality, and the Internal
Revenue Service or any other taxing authority has not initiated or proposed any
such adjustment or change in accounting period.

          (h) No material amount of indebtedness of the Company or any of its
Subsidiaries consists of "corporate acquisition indebtedness" within the meaning
of Section 279 of the Code.

          (i) For purposes of this Agreement (i) "Tax" (and, with correlative
                                                  ---
meaning, "Taxes") means any United States federal, state, local, foreign or
          -----
other income, gross receipts, profits, windfall profits, property, sales, use,
license, excise, franchise, occupation, employment, payroll, premium,
withholding, alternative or added minimum, ad valorem, transfer, stamp,
severance, capital gains, capital stock or excise tax, or any other tax, levy,
custom, duty, governmental fee or other like assessment or charge of any kind
whatsoever (whether payable directly or by withholding and whether or not
requiring the filing of a Tax Return), all estimated taxes, deficiency
assessments, additions to tax, penalties and interest imposed by any
governmental authority with respect to the foregoing, and shall include any
liability for such amounts as a result either of being a member of a combined,
consolidated, unitary or affiliated group or of a contractual obligation to
indemnify any person or other entity with respect to Taxes, and (ii) "Tax
                                                                      ---
Return" means any return, form, report or similar statement with respect to any
Tax (including any schedules, related or supporting information), including
without limitation, any information return, claim for refund, amended return or
declaration of estimated Tax.

          SECTION 3.14.  Rights Agreement.  The copy of the Rights Agreement,
                         ----------------
dated as of June 20, 1996, between the Company and First Chicago Trust Company,
as Rights Agent (the "Rights Agreement"), including all amendments and exhibits
                      ----------------
thereto, that is set forth as an exhibit to the Company's Form 10-K for the year
ended December 31, 1998 is a complete and correct copy thereof.  The Board has
taken all necessary action to amend the Rights Agreement
<PAGE>

                                       19

so that none of the execution of this Agreement, the making of the Offer or the
consummation of the Merger will (a) cause the Rights issued pursuant to the
Rights Agreement to become exercisable, (b) cause Parent or Purchaser to become
an Acquiring Person (as such term is defined in the Rights Agreement) or (c)
give rise to a Distribution Date or a Triggering Event (as each term is defined
in the Rights Agreement).

          SECTION 3.15.  Trademarks, Patents and Copyrights.  The Company and
                         ----------------------------------
the Subsidiaries own, or possess licenses or other valid rights to use, all
patents, patent rights, trademarks, trademark rights, trade names, trade name
rights, copyrights, servicemarks, trade secrets, applications for trademarks and
for servicemarks, know-how and other proprietary rights and information that are
material to the business of the Company and the Material Subsidiaries as
currently conducted, and the Company is unaware of any assertion or claim
challenging the validity of any of the foregoing, other than any assertion or
claim which, individually or in the aggregate, does not have a Material Adverse
Effect.  The conduct of the business of the Company and the Material
Subsidiaries as currently conducted does not conflict with any patent, patent
right, license, trademark, trademark right, trade name, trade name right,
service mark or copyright of any third party, other than conflicts that,
individually or in the aggregate, do not have a Material Adverse Effect.  To the
knowledge of the Company, there are no infringements by any third party of any
proprietary rights owned or licensed by or to the Company or any Material
Subsidiary which, individually or in the aggregate, have a Material Adverse
Effect.

          SECTION 3.16.  Environmental Matters.  Except as would not,
                         ---------------------
individually or in the aggregate, have a Material Adverse Effect, (a) the
Company is in compliance with all applicable Environmental Laws and has obtained
and is in compliance with all governmental permits, licenses and other
authorizations required under any Environmental Law, (b) there are no written
claims pursuant to any Environmental Law pending or, to the Company's knowledge,
threatened, against the Company, (c) the Company has made available to Purchaser
copies of any and all environmental assessment or audit reports or other similar
studies or analyses generated within the last three years and in the Company's
possession, that relate to the Company, and (d) there are no facts,
circumstances or conditions relating to the business or operations of the
Company or any Material Subsidiary, or to any real property currently owned or
operated by the Company or any Material Subsidiary (or, to the knowledge of the
Company, any real property previously owned or operated by the Company or any
Material Subsidiary as a result of the actions or operations of the Company or
any Material Subsidiary), that would reasonably be expected to give rise to any
claim, proceeding or action, or to any liability, under any Environment Law.

          SECTION 3.17.  Brokers.  No broker, finder or investment banker (other
                         -------
than Goldman) is entitled to any brokerage, finder's or other fee or commission
in connection with the Transactions based upon arrangements made by or on behalf
of the Company.  The Company has heretofore furnished to Parent a complete and
correct copy of all agreements between the
<PAGE>

                                       20

Company and Goldman pursuant to which such firm would be entitled to any payment
relating to the Transactions.

          SECTION 3.18.  Year 2000.  Except as would not, individually or in the
                         ---------
aggregate, have a Material Adverse Effect, to the knowledge of the Company all
internal computer systems, computer software, equipment or technology that are
material to the business, finances or operations of the Company and its Material
Subsidiaries or were sold or licensed to customers of the Company and its
Material Subsidiaries are (i) able to receive, record, store, process,
calculate, manipulate and output dates from and after January 1, 2000, time
periods that include January 1, 2000 and information that is dependent on or
relates to such dates or time periods, in the same manner and with the same
accuracy, functionality, data integrity and performance as when dates or time
periods prior to January 1, 2000 are involved, (ii) able to store and output
date information in a manner that is unambiguous as to century and (iii) to
recognize Year 2000 as a leap year.

                                  ARTICLE IV

             REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER
             ------------------------------------------------------

          Parent and Purchaser hereby, jointly and severally, represent and
warrant to the Company that:

          SECTION 4.01.  Corporate Organization.  Each of Parent and Purchaser
                         ----------------------
is a corporation duly organized, validly existing and in good standing under the
laws of the jurisdiction of its incorporation and has the requisite power and
authority and all necessary governmental approvals to own, lease and operate its
properties and to carry on its business as it is now being conducted, except
where the failure to be so organized, existing or in good standing or to have
such power, authority and governmental approvals would not, individually or in
the aggregate, have a material adverse effect on the ability of Parent or
Purchaser to perform their obligations hereunder, or prevent or materially delay
the consummation of the Transactions.

          SECTION 4.02.  Authority Relative to this Agreement.  Each of Parent
                         ------------------------------------
and Purchaser has all necessary corporate power and authority to execute and
deliver this Agreement, to perform its obligations hereunder and to consummate
the Transactions.  The execution and delivery of this Agreement by Parent and
Purchaser and the consummation by Parent and Purchaser of the Transactions have
been duly and validly authorized by all necessary corporate action, and no other
corporate proceedings on the part of Parent or Purchaser are necessary to
authorize this Agreement or to consummate the Transactions (other than, with
respect to the Merger, the filing and recordation of appropriate merger
documents as required by Delaware Law).  This Agreement has been duly and
validly executed and delivered by Parent and Purchaser and, assuming the due
authorization, execution and delivery by the Company,
<PAGE>

                                       21

constitutes legal, valid and binding obligations of each of Parent and Purchaser
enforceable against each of Parent and Purchaser in accordance with its terms.

          SECTION 4.03.  No Conflict; Required Filings and Consents.  (a)  The
                         ------------------------------------------
execution and delivery of this Agreement by Parent and Purchaser do not, and the
performance of this Agreement by Parent and Purchaser will not, (i) conflict
with or violate the Certificate of Incorporation or By-laws or equivalent
organizational documents of either Parent or Purchaser, (ii) conflict with or
violate any law, rule, regulation, order, judgment or decree applicable to
Parent or Purchaser or by which any property or asset of either of them is bound
or affected, or (iii) result in any breach of or constitute a default (or an
event which with notice or lapse of time or both would become a default) under,
or give to others any rights of termination, amendment, acceleration or
cancellation of, or result in the creation of a lien or other encumbrance on any
property or asset of Parent or Purchaser pursuant to, any note, bond, mortgage,
indenture, contract, agreement, lease, license, permit, franchise or other
instrument or obligation to which Parent or Purchaser is a party or by which
Parent or Purchaser or any property or asset of either of them is bound or
affected, except for any such violations, breaches, defaults or other
occurrences which would not, individually or in the aggregate, have a material
adverse effect on the ability of Parent or Purchaser to perform their
obligations hereunder, or prevent or materially delay the consummation of the
Transactions.

          (b) The execution and delivery of this Agreement by Parent and
Purchaser do not, and the performance of this Agreement by Parent and Purchaser
will not, require any consent, approval, authorization or permit of, or filing
with or notification to, any governmental or regulatory authority, domestic or
foreign, except (i) for applicable requirements, if any, of the Exchange Act,
Blue Sky Laws and state takeover laws, the HSR Act, the filing of a notification
with the European Commission under Council Regulation (EC) No. 4064/89, as
amended, or similar antitrust filings or notifications in other jurisdictions
and filing and recordation of appropriate merger documents as required by
Delaware Law and (ii) where failure to obtain such consents, approvals,
authorizations or permits, or to make such filings or notifications, would not,
individually or in the aggregate, have a material adverse effect on the ability
of Parent or Purchaser to perform their obligations hereunder, or prevent or
materially delay the consummation of the Transactions.

          SECTION 4.04.  Financing.  Parent has sufficient funds to permit
                         ---------
Purchaser to acquire all the outstanding Shares in the Offer and the Merger.

          SECTION 4.05.  Offer Documents; Proxy Statement.  The Offer Documents
                         --------------------------------
will not, at the time the Offer Documents are filed with the SEC or are first
published, sent or given to stockholders of the Company, 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 the
light of the circumstances under which they are made, not misleading.  The
information supplied by Parent for inclusion in the Proxy Statement will not, on
the date the
<PAGE>

                                       22

Proxy Statement (or any amendment or supplement thereto) is first mailed to
stockholders of the Company, at the time of the Stockholders' Meeting and at the
Effective Time, contain any statement which, at such time and in light of the
circumstances under which it is made, is false or misleading with respect to any
material fact, or omits to state any material fact required to be stated therein
or necessary in order to make the statements therein not false or misleading or
necessary to correct any statement in any earlier communication with respect to
the solicitation of proxies for the Stockholders' Meeting which shall have
become false or misleading. Notwithstanding the foregoing, Parent and Purchaser
make no representation or warranty with respect to any information supplied by
the Company or any of its representatives which is contained in any of the
foregoing documents or the Offer Documents. The Offer Documents shall comply in
all material respects with the requirements of the Exchange Act and the rules
and regulations thereunder.

          SECTION 4.06.  Brokers.  No broker, finder or investment banker (other
                         -------
than J.P. Morgan & Co.) is entitled to any brokerage, finder's or other fee or
commission in connection with the Transactions based upon arrangements made by
or on behalf of Parent or Purchaser.

          SECTION 4.07.  Absence of Litigation.  As of the date of this
                         ---------------------
Agreement, there is no litigation, suit, claim, action, proceeding or
investigation pending or, to the knowledge of Parent and Purchaser, threatened
against, Parent or Purchaser or any of their respective properties or assets
before any court, arbitrator or administrator, governmental or regulatory
authority or body, domestic or foreign, which seeks to delay or prevent or would
result in the material delay of or would prevent the consummation of any
Transaction.  As of the date of this Agreement, neither Parent nor Purchaser or
any property or asset of Parent or Purchaser is subject to any continuing order
of, consent decree, settlement agreement or similar written agreement with, or,
to the knowledge of Parent and Purchaser, continuing investigation by, any
governmental or regulatory authority, domestic or foreign, or any order, writ,
judgment, injunction, decree, determination or award of any governmental or
regulatory authority or any arbitrator which would prevent Parent or Purchaser
from performing their respective material obligations under this Agreement or
prevent or materially delay the consummation of any Transaction.

          SECTION 4.08.  No Prior Activities.  Since the date of its
                         -------------------
incorporation, Purchaser has not engaged and will not engage prior to the
Effective Time or termination of this Agreement in any activities other than in
connection with or as contemplated by this Agreement.

          SECTION 4.09.  Parent Not an Affiliated Shareholder.  As of the date
                         ------------------------------------
hereof, (i) neither Parent nor any of its Affiliates is, with respect to the
Company, an "interested stockholder" as such term is defined in Section 203 of
Delaware Law and (ii) except to the extent that Parent or its Affiliates may be
deemed to beneficially own Shares as a result of this Agreement, Parent and its
Affiliates collectively do not hold directly or indirectly five percent or more
of the outstanding voting securities of the Company.
<PAGE>

                                       23

                                   ARTICLE V

                     CONDUCT OF BUSINESS PENDING THE MERGER
                     --------------------------------------

          SECTION 5.01.  Conduct of Business by the Company Pending the Merger.
                         -----------------------------------------------------
Except as set forth in Section 5.01 of the Disclosure Schedule, the Company
agrees that, between the date of this Agreement and the Effective Time, the
Company shall, and shall cause its Subsidiaries to, conduct its businesses only
in the ordinary course and shall use all reasonable efforts to preserve
substantially intact the business organization of the Company and the
Subsidiaries, to keep available the services of their current officers and
employees and to preserve the current relationships of the Company and the
Subsidiaries with customers, suppliers and other persons with which the Company
or any Subsidiary has significant business relations. As amplification of the
foregoing, except as contemplated by this Agreement or in Section 5.01 of the
Disclosure Schedule, neither the Company nor any Subsidiary shall, between the
date of this Agreement and the Effective Time, directly or indirectly do, or
propose to do, any of the following without the prior written consent of Parent:

          (a) amend or otherwise change its Certificate of Incorporation or By-
     laws or equivalent organizational documents;

          (b) issue, deliver, sell, pledge, dispose of, grant, encumber, or
     authorize the issuance, delivery, sale, pledge, disposition, grant or
     encumbrance of (i) any shares of capital stock of any class of the Company
     or any Subsidiary, or any options, warrants, convertible securities or
     other rights of any kind to acquire any shares of such capital stock, or
     any other ownership interest (including, without limitation, any phantom
     interest), of the Company or any Subsidiary (except for the issuance of
     Shares issuable pursuant to stock options outstanding on the date hereof)
     or (ii) any assets of the Company or any Subsidiary for consideration in
     excess of $25,000,000 in the aggregate;

          (c) declare, set aside, make or pay any dividend or other
     distribution, payable in cash, stock, property or otherwise, with respect
     to any of its capital stock, except for regular quarterly dividends on the
     Shares declared and paid at times consistent with past practices;

          (d) reclassify, combine, split, subdivide, or issue or authorize the
     issuance of any other securities in respect of, in lieu of or in
     substitution for shares of its capital stock, or redeem, purchase or
     otherwise acquire, directly or indirectly, any shares of the capital stock
     of the Company or any of its Subsidiaries or any other securities thereof
     or any rights, warrants or options to acquire any such shares or other
     securities;

          (e) (i) acquire (including, without limitation, by merger,
     consolidation, or acquisition of stock or assets) any corporation,
     partnership, other business organization or
<PAGE>

                                       24

     any division thereof for consideration in excess of $10,000,000 in the
     aggregate; (ii) except for borrowings under existing credit facilities not
     to exceed $30,000,000 in the aggregate and excepting transactions between
     the Company and any Subsidiary, incur any indebtedness for borrowed money
     or issue any debt securities or assume, guarantee or endorse, or otherwise
     as an accommodation become responsible for, the obligations of any person;
     (iii) except for transactions between the Company and any Subsidiary, make
     any loans, advances, or capital contributions to, or investments in, any
     person, for an amount in excess of $10,000,000 in the aggregate; (iv)
     authorize capital expenditures which are, in the aggregate, in excess of
     $25,000,000 for the Company and the Subsidiaries; (v) acquire any assets
     for consideration in excess of $10,000,000 in the aggregate; or (vi) enter
     into or amend any contract, agreement, commitment or arrangement with
     respect to any matter set forth in this Section 5.01(e);

          (f) except as provided in Section 5.01 of the Disclosure Schedule, as
     contemplated by this Agreement or in the ordinary course of business
     consistent with past practices (i) increase the compensation payable or to
     become payable to its officers or employees, (ii) other than in accordance
     with existing policies and arrangements, grant any severance pay to or
     (iii) establish, adopt, enter into or amend any collective bargaining,
     bonus, profit sharing, thrift, compensation, stock option, restricted
     stock, pension, retirement, deferred compensation, employment, termination,
     severance or other plan, agreement, trust, fund, policy or arrangement for
     the benefit of any director, officer or employee, except as contemplated by
     the Agreement or to the extent required by applicable law or the terms or a
     collective bargaining agreement or a contractual obligation existing on the
     date hereof;

          (g) other than as required by generally accepted accounting
     principles, make any change to its accounting policies or procedures;

          (h) agree to the settlement of any claim or litigation which would
     have a Material Adverse Effect;

          (i) make, change or rescind any material Tax election (other than (i)
     recurring elections that customarily are made in connection with the filing
     of any Tax Return; provided that any such elections are consistent with the
     past practices of the Company or its Subsidiaries, as the case may be; (ii)
     gain recognition agreements under Section 367 of the Code and Treasury
     regulations thereunder with respect to transactions occurring in the 1998
     fiscal year of the Company; and (iii) elections with respect to
     Subsidiaries purchased by the Company under Section 338(h)(10) of the Code
     or, solely in the case of non-U.S. Subsidiaries purchased by the Company,
     Section 338(g) of the Code) or settle or compromise any material Tax
     liability that is the subject of an audit, claim for delinquent Taxes,
     examination, action, suit, proceeding or investigation by any taxing
     authority;
<PAGE>

                                       25

          (j) except to the extent required under existing employee and director
     benefit plans, agreements or arrangements as in effect on the date of this
     Agreement or as contemplated by this Agreement, accelerate the payment,
     right to payment or vesting of any bonus, severance, profit sharing,
     retirement, deferred compensation, stock option, insurance or other
     compensation or benefits;

          (k) pay, discharge or satisfy any material claims, material
     liabilities or material obligations (absolute, accrued, asserted or
     unasserted, contingent or otherwise), other than the payment, discharge or
     satisfaction (A) of any such material claims, material liabilities or
     material obligations in the ordinary course of business and consistent with
     past practice or (B) of material claims, material liabilities or material
     obligations reflected or reserved against in, or contemplated by, the
     consolidated financial statements (or the notes thereto) contained in the
     Company SEC Reports;

          (l) enter into any agreement, understanding or commitment that
     restrains, limits or impedes the Company's or any of its Subsidiaries'
     ability to compete with or conduct any business or line of business,
     including, but not limited to, geographic limitations on the Company's or
     any of its Subsidiaries' activities;

          (m) materially modify, amend or terminate any material contract to
     which it is a party or waive any of its material rights or claims except in
     the ordinary course of business consistent with past practice; or

          (n) agree or enter into, in writing or otherwise, or amend any
     contract, agreement commitment or arrangement with respect to any of the
     actions set forth in this Section 5.01.

          SECTION 5.02.  Third Party Standstill Agreements and Confidentiality
                         -----------------------------------------------------
Agreements.  During the period from the date of this Agreement through the
- ----------
Effective Time, subject to the fiduciary duties of the Board under applicable
law as determined by the Board in good faith after receiving the advice of
experienced, independent counsel (which counsel may be Shearman & Sterling) (i)
the Company shall not terminate, amend, modify or waive any provision of any
confidentiality or standstill agreement to which the Company or any of its
Subsidiaries is a party (other than any involving Parent), and (ii) the Company
shall enforce, to the fullest extent permitted under applicable law, the
provisions of any such agreements, including, but not limited to, obtaining
injunctions to prevent any breaches of such agreements and to enforce
specifically the terms and provisions thereof in any court of the United States
or any state thereof having jurisdiction.  In the event of any Acquisition
Proposal or unsolicited bid for any Shares from any third party which is a party
to any such standstill agreement, the Company shall advise Parent that such
third party is subject to such a standstill agreement and that the Company will
enforce such standstill agreement as contemplated by this Section 5.02.
<PAGE>

                                       26

                                  ARTICLE VI

                             ADDITIONAL AGREEMENTS
                             ---------------------

          SECTION 6.01.  Stockholders' Meeting.  The Company, acting through the
                         ---------------------
Board, shall, in accordance with applicable law and the Company's Restated
Certificate of Incorporation and By-laws, (i) duly call, give notice of, convene
and hold an annual or special meeting of its stockholders as soon as practicable
following consummation of the Offer for the purpose of considering and taking
action on this Agreement and the transactions contemplated hereby (the
"Stockholders' Meeting") and (ii) subject to the fiduciary duties of the Board
- ----------------------
under applicable law as determined by the Board in good faith after receiving
the advice of experienced, independent counsel, (A) include in the Proxy
Statement the recommendation of the Board that the stockholders of the Company
approve and adopt this Agreement and the Transactions and (B) use all reasonable
efforts to obtain such approval and adoption.  At the Stockholders' Meeting,
Parent and Purchaser shall cause all Shares then owned by them and their
Subsidiaries to be voted in favor of the approval and adoption of this Agreement
and the Transactions.  The record date for the Stockholders' Meeting shall be a
date subsequent to the date Parent or Purchaser becomes a record holder of
Shares purchased pursuant to the Offer.

          SECTION 6.02.  Proxy Statement.  If stockholder approval of the Merger
                         ---------------
is required by applicable law, as soon as practicable following consummation of
the Offer, the Company shall file the Proxy Statement with the SEC under the
Exchange Act, and shall use all reasonable efforts to have the Proxy Statement
cleared by the SEC.  Parent, Purchaser and the Company shall cooperate with each
other in the preparation of the Proxy Statement, and the Company shall notify
Parent of the receipt of any comments of the SEC with respect to the Proxy
Statement and of any requests by the SEC for any amendment or supplement thereto
or for additional information and shall provide to Parent promptly copies of all
correspondence between the Company, or any representative of the Company, and
the SEC or its staff.  The Company shall give Parent and its counsel the
opportunity to review the Proxy Statement prior to its being filed with the SEC
and shall give Parent and its counsel the opportunity to review all amendments
and supplements to the Proxy Statement and all responses to requests for
additional information and replies to comments prior to their being filed with,
or sent to, the SEC.  Each of the Company, Parent and Purchaser agrees to use
all reasonable efforts, after consultation with the other parties hereto, to
respond promptly to all such comments of and requests by the SEC and to cause
the  Proxy Statement and all required amendments and supplements thereto to be
mailed to the Holders entitled to vote at the Stockholders' Meeting at the
earliest practicable time.

          SECTION 6.03.  Company Board Representation; Section 14(f).  (a)
                         -------------------------------------------
Promptly upon the purchase by Purchaser of Shares pursuant to the Offer, and
from time to time thereafter, Purchaser shall be entitled to designate up to
such number of directors, rounded up to the next whole number, on the Board as
shall give Purchaser representation on the Board equal to the product of the
total number of directors on the Board (giving effect to the directors elected
<PAGE>

                                       27

pursuant to this sentence) multiplied by the percentage that the aggregate
number of shares of Common Stock beneficially owned by Purchaser or any
Affiliate of Purchaser following such purchase bears to the total number of
shares of Common Stock then outstanding, and the Company shall, at such time,
promptly take all actions necessary to cause Purchaser's designees to be elected
as directors of the Company, including increasing the size of the Board or
securing the resignations of incumbent directors or both.  At such times, the
Company shall use all reasonable efforts to cause persons designated by
Purchaser to constitute the same percentage of each committee of the Board as
persons designated by Purchaser to constitute the Board to the extent permitted
by applicable law.

          (b) The Company shall promptly take all actions required pursuant to
Section 14(f) of the Exchange Act and Rule 14f-1 promulgated thereunder in order
to fulfill its obligations under this Section 6.03 and shall include in the
Schedule 14D-9 such information with respect to the Company and its officers and
directors as is required under Section 14(f) and Rule 14f-1 to fulfill such
obligations.  Parent or Purchaser shall supply to the Company and be solely
responsible for any information with respect to either of them and their
nominees, officers, directors and affiliates required by such Section 14(f) and
Rule 14f-1.

          (c) Following the election of designees of Purchaser pursuant to this
Section 6.03, prior to the Effective Time, any amendment of this Agreement or
the Restated Certificate of Incorporation or By-laws of the Company, any
termination of this Agreement by the Company, any extension by the Company of
the time for the performance of any of the obligations or other acts of Parent
or Purchaser or waiver of any of the Company's rights hereunder shall require
the concurrence of a majority of the directors of the Company then in office who
neither were designated by Purchaser nor are employees of the Company.

          SECTION 6.04.  Access to Information; Confidentiality.  (a)  From the
                         --------------------------------------
date hereof to the Effective Time, the Company shall, and shall cause the
Subsidiaries and the officers, directors, employees, auditors and agents of the
Company and the Subsidiaries to, afford the officers, employees and agents
(including accountants, counsel, financial advisors and other representatives)
of Parent and Purchaser reasonable access at all reasonable times to the
officers, employees, agents, properties, offices and other facilities, books and
records of the Company and each Subsidiary, and shall furnish Parent and
Purchaser with (i) a copy of each report, schedule, registration statement and
other documents filed by it during such period pursuant to the requirements of
federal or state laws and (ii) all financial, operating and other data and
information as Parent or Purchaser, through its officers, employees or agents,
may reasonably request.

          (b) All information obtained by Parent or Purchaser pursuant to this
Section 6.04 shall be kept confidential in accordance with the confidentiality
agreement, dated April 13, 1999 (the "Confidentiality Agreement"), between
                                      -------------------------
Degremont S.A. and Goldman on behalf of the Company.
<PAGE>

                                       28

          SECTION 6.05.  No Solicitation.  (a)  The Company shall, and shall
                         ---------------
direct and use all reasonable efforts to cause its officers, directors,
employees and agents (including accountants, counsel, financial advisors and
other representatives) to, immediately cease any discussions or negotiations
with any parties that may be ongoing with respect to any Acquisition Proposal
(as defined below in this Section 6.05(a)).  The Company shall not, nor shall it
permit any of its Subsidiaries to, nor shall it authorize or permit any officer,
director or employee of, or any agent (including accountants, counsel, financial
advisors and other representatives) of, the Company or any of its Subsidiaries
to, directly or indirectly, (i) solicit, facilitate or initiate, or knowingly
encourage the submission of, any Acquisition Proposal (including, without
limitation, the taking of any action which would make Section 203 of the
Delaware Law inapplicable to the Acquisition Proposal) or (ii) participate in
any discussions or negotiations regarding, or furnish or disclose to any person
or legal entity (other than Parent or Purchaser) any information with respect
to, or take any other action to facilitate any inquiries or the making of any
proposal that constitutes, or may reasonably be expected to lead to, an
Acquisition Proposal; provided, however, that if, prior to the acceptance for
                      --------  -------
payment of Shares pursuant to the Offer, the Board determines in good faith that
it is necessary to do so in accordance with its fiduciary duties to the
Company's stockholders under applicable law as advised by experienced,
independent counsel (which counsel may be Shearman & Sterling), the Company may,
in response to an unsolicited Acquisition Proposal, and subject to compliance
with Section 6.05(c), (x) furnish or disclose information with respect to the
Company and its Subsidiaries to any third party pursuant to a customary
confidentiality agreement on terms no less favorable to the Company nor more
favorable to such third party than those contained in the Confidentiality
Agreement and (y) participate in negotiations regarding such Acquisition
Proposal.  For purposes of this Agreement, "Acquisition Proposal" means any bona
                                            --------------------
fide inquiry, proposal or offer from any third party relating to any direct or
indirect acquisition or purchase of all or a substantial part of the assets of
the Company or of over 20% of the voting securities of the Company, any tender
offer or exchange offer that if consummated would result in any person
beneficially owning 20% or more of the voting securities of the Company, any
merger, consolidation, business combination, sale of substantially all the
assets, recapitalization, liquidation, dissolution or similar transaction
involving the Company, other than the Transactions, or any other transaction the
consummation of which could reasonably be expected to impede, interfere with,
prevent or materially delay the Offer or the Merger or which could reasonably be
expected to dilute materially the benefits to Parent of the Transactions.

          (b) Except as set forth in this Section 6.05, neither the Board nor
any committee thereof shall (i) withdraw or modify, or propose to withdraw or
modify, in a manner adverse to Parent or Purchaser, the approval or
recommendation by the Board or any such committee of the Offer, this Agreement
or the Merger, (ii) approve or recommend, or propose to approve or recommend,
any Acquisition Proposal or (iii) cause the Company to enter into any agreement
with respect to any Acquisition Proposal or any letter of intent, agreement in
principle, or other similar understanding or arrangement with respect to an
Acquisition Proposal or any understanding, arrangement or agreement requiring or
incentivizing the Company to abandon,
<PAGE>

                                       29

terminate or fail to consummate the Merger or any of the Transactions.
Notwithstanding the foregoing, in the event prior to the time of acceptance for
payment of Shares pursuant to the Offer the Board determines in good faith that
it is necessary to do so in accordance with its fiduciary duties to the
Company's stockholders under applicable law as advised by experienced,
independent counsel (which counsel may be Shearman & Sterling), the Board may
recommend to its stockholders an Acquisition Proposal and in connection
therewith withdraw or adversely modify its approval or recommendation of the
Offer or the Merger if (i) a third party makes a Superior Proposal and (ii) (A)
five Business Days have elapsed following delivery to Parent of a written notice
of the determination by the Board to take such action and during such five
Business Day period the Company has fully cooperated with Parent, with the
intent of enabling Parent and Purchaser, on the one hand, and the Company, on
the other hand, to agree to a modification of this Agreement and (B) at the end
of such five Business Day period, the Acquisition Proposal continues to
constitute a Superior Proposal, and concurrently therewith or afterwards the
Board may terminate this Agreement pursuant to the provisions of Section 8.01(e)
in order to permit the Company to enter into any agreement with respect to any
such Superior Proposal; provided that any agreement with a third party with
                        --------
respect to a Superior Proposal shall provide an opportunity for Parent (and any
other person) to make an additional final bid for the Company and, if such bid
would constitute a Superior Proposal, for the Company to accept such bid.  For
purposes of this Agreement, a "Superior Proposal" means any bona fide proposal
                               -----------------
made by a third party to acquire, directly or indirectly, for consideration
consisting of cash and/or securities, all outstanding Shares pursuant to a
tender offer or a merger or purchase of all of the assets of the Company (i) on
terms which the Board determines in good faith (based on the written advice of a
financial advisor of nationally recognized reputation) to be more favorable to
the Company and its stockholders than the Transactions, as proposed to be
modified by Parent in accordance with the provisions of this paragraph, (ii) for
which financing, to the extent required, is then available (it being understood
that financing evidenced by highly confident letters and similar letters shall
not be considered "available" for purposes of this Section 6.05), and (iii)
which is not subject to any financing or due diligence condition.

          (c) In addition to the obligations of the Company set forth in
paragraphs (a) and (b) of this Section 6.05, immediately after receipt thereof,
the Company shall advise Parent in writing of any request for information
regarding an Acquisition Proposal, or any inquiry or proposal with respect to an
Acquisition Proposal.  The Company shall keep Parent informed of the status of
any such request or Acquisition Proposal.  The Company shall promptly provide to
Parent any non-public information concerning the Company provided to any other
person in connection with any Acquisition Proposal which was not previously
provided to Parent.

          (d) Nothing contained in this Section 6.05 shall prohibit the Company
from taking and disclosing to its stockholders a position contemplated by Rule
14e-2(a) promulgated under the Exchange Act or from making any disclosure to the
Company's stockholders if the Board determines in good faith that it is
necessary to do so in accordance with its fiduciary duties
<PAGE>

                                       30

to the Company's stockholders under applicable law as advised by experienced,
independent counsel (which counsel may be Shearman & Sterling).

          (e) The Company agrees not to release any third party from, or waive
any provision of, any confidentiality or standstill agreement to which the
Company is a party. Immediately following the execution of this Agreement, the
Company shall request each person or entity which has heretofore executed a
confidentiality agreement in connection with its consideration of acquiring the
Company or any portion thereof to return all confidential information heretofore
furnished to such person or entity by or on behalf of the Company.

          SECTION 6.06.  Employee Benefits Matters.  Annex B hereto sets forth
                         -------------------------
certain agreements among the parties hereto with respect to the Plans and other
employee benefits matters.

          SECTION 6.07.  Directors' and Officers' Indemnification and Insurance.
                         ------------------------------------------------------
(a)  The Certificate of Incorporation and By-Laws of the Surviving Corporation
shall contain provisions (collectively, "Indemnification Provisions") no less
                                         --------------------------
favorable with respect to indemnification than are set forth in the Restated
Certificate of Incorporation and By-Laws of the Company, which provisions shall
not be amended, repealed or otherwise modified for a period of six years from
the Effective Time in any manner that would affect adversely the rights
thereunder of individuals who at the Effective Time were directors, officers,
employees, fiduciaries or agents of the Company, unless such modification shall
be required by law.

          (b) The Surviving Corporation shall maintain in effect for six years
from the Effective Time, if available, the current directors' and officers'
liability insurance policies maintained by the Company (provided that Parent and
the Surviving Corporation may substitute therefor policies of at least the same
coverage containing terms and conditions which are not materially less
favorable) with respect to matters occurring prior to the Effective Time.
Notwithstanding the foregoing, in no event shall Parent or the Surviving
Corporation be required to expend pursuant to this Section 6.07(b) more than an
amount per year equal to 200% of current annual premiums paid by the Company for
such insurance (which the Company represents to be $476,525 for the 12 month
period ended October 1, 1999); provided further that, in the event of an
                               -------- -------
expiration, termination or cancellation of such current policies, Parent or the
Surviving Corporation shall be required to obtain as much coverage as is
possible under substantially similar policies for such 200% amount.

          (c) Prior to the Effective Time, the Company shall, to the fullest
extent permitted under applicable law and regardless of whether the Merger
becomes effective, indemnify and hold harmless, and, after the Effective Time,
the Surviving Corporation shall, to the fullest extent permitted under
applicable law, indemnify and hold harmless, each present and former director,
officer or employee of the Company and each Subsidiary (collectively, the
"Indemnified Parties") against all costs and expenses (including attorneys'
- --------------------
fees), judgments,
<PAGE>

                                       31

fines, losses, claims, damages, liabilities and settlement amounts paid in
connection with any claim, action, suit, proceeding or investigation (whether
arising before or after the Effective Time), whether civil, criminal,
administrative or investigative, arising out of or pertaining to any action or
omission in their capacity as an officer, director or employee whether occurring
before or after the Effective Time (including, without limitation, the
Transactions), for a period of six years after the date hereof. Without limiting
the generality of the foregoing, in the event of any such claim, action, suit,
proceeding or investigation, (i) the Company or the Surviving Corporation, as
the case may be, shall pay as incurred, each Indemnified Party's legal and other
expenses (including costs of investigation and preparation), including the fees
and expenses of counsel selected by the Indemnified Party, promptly after
statements therefor are received and (ii) the Company and the Surviving
Corporation shall cooperate in the defense of any such matter; provided,
                                                               --------
however, that none of the Company or the Surviving Corporation
- -------
shall be liable for any settlement effected without its written consent (which
consent shall not be unreasonably withheld); and provided further that, in the
                                                 -------- -------
event that any claim for indemnification is asserted or made within such six-
year period, all rights to indemnification in respect of such claim shall
continue until the disposition of such claim.  The parties intend, to the extent
not prohibited by applicable law, that the indemnification provided for in this
Section 6.07 shall apply without limitation to negligent acts or omissions of
any Indemnified Party.  Any determination to be made as to whether any
Indemnified Party has met any standard of conduct imposed by law shall be made
by legal counsel reasonably acceptable to such Indemnified Party and the
Surviving Corporation, retained at the Surviving Corporation's expense.  The
Company or the Surviving Corporation shall pay all expenses, including counsel
fees and expenses, that any Indemnified Party may incur in enforcing the
indemnity and other obligations provided for in this Section 6.07.

          (d) In the event the Company, the Surviving Corporation or Parent or
any of their respective successors or assigns (i) consolidates with or merges
into any other person and shall not be the continuing or surviving corporation
or entity of such consolidation or merger or (ii) transfers all or substantially
all of its properties and assets to any person, then and in each such case,
proper provision shall be made so that the successors and assigns of the
Company, the Surviving Corporation or Parent, as the case may be, shall assume
the obligations set forth in this Section 6.07.

          (e) This Section 6.07 is intended to benefit the Indemnified Parties
and their respective heirs, executors and personal representatives, may be
enforced by them and shall be binding on the successors and assigns of Parent,
the Company and the Surviving Corporation. This Section 6.07 shall not limit or
otherwise adversely affect any rights any Indemnified Party may have under any
agreement with the Company or any Subsidiary or the Company's or any
Subsidiary's Articles of Incorporation or By-Laws.

          SECTION 6.08.  Further Action; Reasonable Best Efforts.  (a)  Upon the
                         ---------------------------------------
terms and subject to the conditions hereof, each of the parties hereto shall,
and shall use their
<PAGE>

                                       32

reasonable best efforts to cause their respective Subsidiaries, as applicable,
to (i) make promptly all respective filings, and thereafter make any other
required submissions, under the HSR Act and under Council Regulation (EC) No.
4064/89, as amended, with respect to the Merger and the Transactions, (ii) use
its reasonable best efforts to take, or cause to be taken, all appropriate
action, and to do, or cause to be done, all things necessary, proper or
advisable under applicable laws and regulations to consummate and make effective
the Transactions, including, without limitation, using all reasonable efforts to
obtain all licenses, permits, consents, waivers, approvals, authorizations,
qualifications and orders of governmental authorities and parties to contracts
with the Company and the Subsidiaries as are necessary for the consummation of
the Transactions and to fulfill the conditions to the Offer and the Merger and
(iii) not take action (including effecting or agreeing to effect or announcing
an intention or proposal to effect any acquisition, business combination or
other transaction) which could reasonably be expected to impede, interfere with,
prevent, impair or delay the ability of the parties to consummate the Merger.
The parties shall consult and cooperate with each other in connection with the
making of all such filings or submissions, including providing copies of all
such documents to the non-filing or non-submitting party and its advisors prior
to filing or submitting. In case at any time after the Effective Time any
further action is necessary or desirable to carry out the purposes of this
Agreement, the proper officers and directors of each party to this Agreement
shall use their reasonable best efforts to take all such action.

          (b) Each of Parent and Purchaser shall use its best efforts to defend
through litigation on the merits any claim asserted in court by any party in
order to avoid the entry of, or to have vacated or terminated, any decree,
order, or judgment that would restrain or prevent the consummation of the Offer
by December 31, 1999.

          SECTION 6.09.  Public Announcements.  Parent and the Company shall
                         --------------------
consult with each other before issuing any press release or otherwise making any
public statements with respect to this Agreement or any Transaction and shall
not issue any such press release or make any such public statement without the
prior consent of the other parties, except as may be required by applicable law
or regulation or by obligations pursuant to any listing agreement with a
national securities exchange to which Parent or the Company is a party.

          SECTION 6.10.  Confidentiality Agreement.  The Company hereby waives
                         -------------------------
the provisions of the Confidentiality Agreement as and to the extent necessary
to permit the consummation of each Transaction.  Upon the acceptance for payment
of Shares pursuant to the Offer, the Confidentiality Agreement shall be deemed
to have terminated without further action by the parties thereto.
<PAGE>

                                       33

                                  ARTICLE VII

                            CONDITIONS TO THE MERGER
                            ------------------------

          SECTION 7.01.  Conditions to the Merger.  The respective obligations
                         ------------------------
of each party to effect the Merger shall be subject to the satisfaction at or
prior to the Effective Time of the following conditions:

          (a) Stockholder Approval.  This Agreement and the Transactions shall
              --------------------
     have been approved and adopted by the affirmative vote of the stockholders
     of the Company to the extent required by Delaware Law and the Restated
     Certificate of Incorporation of the Company;

          (b) HSR Act; EC.  Any waiting period (and any extension thereof)
              -----------
     applicable to the consummation of the Merger under the HSR Act shall have
     expired or been terminated and the Commission of the European Union shall
     have approved the Transactions under Regulation (EC) No. 4064/89, as
     amended, of the Council of the European Union;

          (c) Other Reviews/Approvals.  Any review or approval required by
              -----------------------
     governmental authorities in countries in which the Company or its
     Subsidiaries have operations material to the Company and its Subsidiaries,
     taken as a whole, shall have been completed or obtained;

          (d) No Order.  No United States federal or state or Republic of France
              --------
     governmental authority or other agency or commission or court of competent
     jurisdiction shall have enacted, issued, promulgated, enforced or entered
     any law, rule, regulation, executive order, decree, injunction or other
     order (whether temporary, preliminary or permanent) (a "Governmental
                                                             ------------
     Order") which is then in effect and has the effect of prohibiting
     consummation of the Merger; and

          (e) Offer.  Purchaser or its permitted assignee shall have purchased
              -----
     all Shares validly tendered and not withdrawn pursuant to the Offer.

                                 ARTICLE VIII

                       TERMINATION, AMENDMENT AND WAIVER
                       ---------------------------------

          SECTION 8.01.  Termination.  This Agreement may be terminated and the
                         -----------
Merger and the other Transactions may be abandoned at any time prior to the
Effective Time, notwithstanding any requisite approval and adoption of this
Agreement and the transactions contemplated hereby by the stockholders of the
Company:
<PAGE>

                                       34

          (a) By mutual written consent duly authorized by the Boards of
     Directors of Parent, Purchaser and the Company; or

          (b) By either Parent, Purchaser or the Company if (i) the Offer is not
     completed on or before December 31, 1999; provided, however, that the right
                                               --------  -------
     to terminate this Agreement under this clause (i) shall not be available to
     any party whose failure to fulfill any obligation under this Agreement has
     been the cause of, or resulted in, the failure to complete the Offer on or
     before such date; or (ii) any United States federal or state court of
     competent jurisdiction or court of the Republic of France of competent
     jurisdiction or other United States federal or state governmental authority
     or other governmental authority of the Republic of France shall have issued
     an order, decree, ruling or taken any other action restraining, enjoining
     or otherwise prohibiting the Merger and such order, decree, ruling or other
     action shall have become final and non-appealable; or

          (c) By Parent, prior to the acceptance of Shares pursuant to the
     Offer, if (i) due to an occurrence or circumstance that would result in a
     failure to satisfy any condition set forth in Annex A hereto, Purchaser
     shall have (A) terminated the Offer without having accepted any Shares for
     payment thereunder or (B) failed to pay for Shares pursuant to the Offer by
     December 31, 1999, unless such failure to accept Shares for payment or to
     pay for Shares shall have been caused by or resulted from the failure of
     Parent or Purchaser to perform any covenant or agreement of either of them
     contained in this Agreement or the breach by Parent or Purchaser of any
     representation or warranty of either of them contained in this Agreement;
     or (ii) prior to the purchase of Shares pursuant to the Offer, the Board or
     any committee thereof shall have withdrawn or modified in a manner adverse
     to Purchaser or Parent its approval or recommendation of the Offer, this
     Agreement, the Merger or any other Transaction in order to approve or
     recommend any other Acquisition Proposal; or

          (d) By the Company, upon approval of the Board, if Purchaser shall
     have (A) failed to commence the Offer within five Business Days following
     the date of this Agreement, (B) terminated the Offer without having
     accepted any Shares for payment thereunder or (C) failed to pay for Shares
     pursuant to the Offer by December 31, 1999, unless such failure to accept
     Shares for payment or to pay for Shares shall have been caused by or
     resulted from the failure of the conditions specified in paragraphs (c) or
     (d) of Annex A to be satisfied; or

          (e) By the Company, upon approval of the Board, if, prior to the
     acceptance of Shares by Purchaser pursuant to the Offer, the Board shall
     determine that it is necessary to do so in accordance with its fiduciary
     duties to the Company's stockholders under applicable law as advised by
     experienced, independent counsel (which counsel may be Shearman & Sterling)
     in order to accept a Superior Proposal; provided that the Company
                                             --------
<PAGE>

                                       35

     may not terminate this Agreement pursuant to this Section 8.01(e) unless
     and until (i) five Business Days have elapsed following delivery to Parent
     of written notice of such determination of the Company, and during such
     five Business Day period the Company has fully cooperated with Parent, with
     the intent of enabling both parties to agree to a modification of the terms
     and conditions of this Agreement so that the transactions contemplated
     hereby may be effected, (ii) at the end of such five Business Day period
     the Acquisition Proposal continues to constitute a Superior Proposal and
     the Board shall determine that it is necessary to terminate this Agreement
     and accept such Superior Proposal in order to comply with its fiduciary
     duties to the Company's stockholders under applicable law as advised by
     experienced, independent counsel (which counsel may be Shearman &
     Sterling), and (iii) (x) prior to such termination, Parent has received the
     amount required by Section 8.03(d) and (y) concurrently with such
     termination the Company enters into a definitive acquisition, merger or
     similar agreement to effect the Superior Proposal which agreement with
     respect to a Superior Proposal shall provide an opportunity for Parent (and
     any other person) to make an additional final bid for the Company and, if
     such bid would constitute a Superior Proposal, for the Company to accept
     such bid.

          SECTION 8.02.  Effect of Termination.  In the event of the termination
                         ---------------------
of this Agreement pursuant to Section 8.01, this Agreement shall have no further
effect, and there shall be no further liability on the part of any party hereto,
except (i) as set forth in Sections 6.04, 8.03 and 9.01 and (ii) nothing herein
shall relieve any party from liability for any wilful breach hereof.

          SECTION 8.03.  Fee.  (a)  In the event that (i) Parent terminates this
                         ---
Agreement pursuant to Section 8.01(c)(ii), (ii) at the time of such termination
a third party shall have publicly made an Acquisition Proposal (whether or not
such Acquisition Proposal shall have been subsequently withdrawn), and (iii)
such Acquisition Proposal is consummated within 12 months after the date of such
termination, then the Company shall pay Parent promptly (but in no event later
than two Business Days after the consummation of the Acquisition Proposal
referred to in clause (ii) above) a fee of $125,000,000 (the "Fee"), which
                                                              ---
amount shall be payable in immediately available funds.

          (b) In the event that (i) Parent terminates this agreement pursuant to
Section 8.01(c)(i) because of a failure to satisfy the condition specified in
paragraph (c) or (d) of Annex A, (ii) at the time of such termination a third
party shall have publicly made an Acquisition Proposal (whether or not such
Acquisition Proposal shall have been subsequently withdrawn), and (iii) such
Acquisition Proposal is consummated within 12 months after the date of such
termination, then the Company shall pay Parent promptly (but in no event later
than two Business Days after the consummation of the Acquisition Proposal
referred to in clause (ii) above) the Fee, which shall be paid in immediately
available funds.
<PAGE>

                                       36

          (c) Subject to the application of the provisions of paragraph (b)
above (in which case the provisions of this paragraph (c) shall not apply), in
the event that Parent terminates this Agreement pursuant to Section 8.01(c)(i)
because of a failure to satisfy the conditions specified in paragraphs (c) or
(d) of Annex A, then the Company shall pay to Parent promptly after being
invoiced by Parent therefor (but in no event later than two Business Days after
receiving such invoice) an amount equal to Parent's Expenses, which shall be
paid in immediately available funds.

          (d) In the event the Company terminates this Agreement pursuant to
Section 8.01(e), then, simultaneously with such termination by the Company, the
Company shall pay to Parent the Fee, which shall be paid in immediately
available funds.

          (e) In the event that the Company terminates this Agreement pursuant
to Section 8.01(d) and Parent or Purchaser shall have failed to perform or
comply with, in any material respect, any material agreement or covenant of
Parent or Purchaser under this Agreement, then Parent shall pay to the Company
promptly after being invoiced by the Company therefor (but in no event later
than two Business Days after receiving such invoice) an amount equal to the
Company's Expenses, which shall be paid in immediately available funds.

          (f) In the event that any party shall fail to pay the Fee or Expenses
when due, such party, without being relieved of any obligation to pay the Fee or
Expenses as the case may be in full, shall reimburse the other party for the
Expenses actually incurred or accrued by such other party in connection with the
collection under and enforcement of this Section 8.03, together with interest on
such unpaid Fee or Expenses, commencing on the date that the Fee or Expenses
became due, at a rate equal to the rate of interest publicly announced by
Citibank, N.A., from time to time, in the City of New York, as such bank's Base
Rate.

          (g) "Expenses" shall mean documented and reasonable out-of-pocket fees
and expenses incurred or paid by or on behalf of the party incurring such fees
and expenses in connection with the Offer, Merger or the consummation of the
Transactions, including, but not limited to, all filing fees, printing fees and
reasonable fees and expenses of law firms, commercial banks, investment banking
firms, accountants, experts and consultants to such party.

          SECTION 8.04.  Amendment.  Subject to Section 6.03, this Agreement may
                         ---------
be amended by the parties hereto by action taken by or on behalf of their
respective Boards of Directors at any time prior to the Effective Time;
provided, however, that, after the approval and adoption of this Agreement and
- --------  -------
the transactions contemplated hereby by the stockholders of the Company, no
amendment may be made which would reduce the amount or change the type of
consideration into which each Share shall be converted upon consummation of the
Merger.  This Agreement may not be amended except by an instrument in writing
signed by the parties hereto.
<PAGE>

                                       37

          SECTION 8.05.  Waiver.  At any time prior to the Effective Time, any
                         ------
party hereto may (i) extend the time for the performance of any obligation or
other act of any other party hereto, (ii) waive any inaccuracy in the
representations and warranties contained herein or in any document delivered
pursuant hereto and (iii) waive compliance with any agreement or condition
contained herein.  Any such extension or waiver shall be valid if set forth in
an instrument in writing signed by the party or parties to be bound thereby.

                                  ARTICLE IX

                               GENERAL PROVISIONS
                               ------------------

          SECTION 9.01.  Non-Survival of Representations, Warranties and
                         -----------------------------------------------
Agreements. The representations, warranties and agreements in this Agreement
- ----------
shall terminate at the Effective Time or upon the termination of this Agreement
pursuant to Section 8.01, as the case may be, except that the agreements set
forth in Article II and Section 6.07 shall survive the Effective Time
indefinitely; the agreement set forth in Section 6.06 shall survive the
Effective Time until the expiration of the applicable statute of limitations;
and those set forth in Sections 6.04(b) and 8.03 shall survive termination
indefinitely.

          SECTION 9.02.  Notices.  All notices, requests, claims, demands and
                         -------
other communications hereunder shall be in writing and shall be given (and shall
be deemed to have been duly given upon receipt) by delivery in person, by cable,
telecopy, telegram or telex or by registered or certified mail (postage prepaid,
return receipt requested) to the respective parties at the following addresses
(or at such other address for a party as shall be specified in a notice given in
accordance with this Section 9.02):

          if to Parent or Purchaser:

               Suez Lyonnaise des Eaux
               1, rue d'Astorg
               75008 Paris, France
               Attention: Patrice Herbet
               Telephone: 33-1-40-06-65-58
               Fax: 33-1-40-06-66-22

          with a copy to:

               White & Case LLP
               1155 Avenue of the Americas
               New York, New York  10036
               Attention:   Kevin Keogh
               Telephone:  (212) 819-8227
               Fax:  (212) 354-8113
<PAGE>

                                       38

          if to the Company:

               Nalco Chemical Company
               One Nalco Center
               Naperville, Illinois 60563
               Attention: General Counsel
               Telephone: (630) 305-2837
               Fax: (630) 305 -1890

          with a copy to:

               Shearman & Sterling
               599 Lexington Avenue
               New York, New York  10022
               Attention:  David W. Heleniak
               Telephone:  (212) 848-7049
               Fax:  (212) 848-7179

           SECTION 9.03. Certain Definitions.  For purposes of this Agreement,
                         -------------------
the term

          (a) "Affiliate" of a specified person means a person who directly or
               ---------
     indirectly through one or more intermediaries controls, is controlled by,
     or is under common control with, such specified person;

          (b) "Beneficial Owner" with respect to any Shares means a person who
               ----------------
     shall be deemed to be the beneficial owner of such Shares (i) which such
     person or any of its Affiliates or associates (as such term is defined in
     Rule 12b-2 promulgated under the Exchange Act) beneficially owns, directly
     or indirectly, (ii) which such person or any of its Affiliates or
     associates has, directly or indirectly, (A) the right to acquire (whether
     such right is exercisable immediately or subject only to the passage of
     time), pursuant to any agreement, arrangement or understanding or upon the
     exercise of consideration rights, exchange rights, warrants or options, or
     otherwise, or (B) the right to vote pursuant to any agreement, arrangement
     or understanding or (iii) which are beneficially owned, directly or
     indirectly, by any other persons with whom such person or any of its
     Affiliates or associates or person with whom such person or any of its
     Affiliates or associates has any agreement, arrangement or understanding
     for the purpose of acquiring, holding, voting or disposing of any Shares;

          (c) "Business Day" means any day on which the principal offices of the
               ------------
     SEC in Washington, D.C. are open to accept filings, or, in the case of
     determining a date when any payment is due, any day on which banks are not
     required or authorized to close in the City of New York;
<PAGE>

                                       39

          (d) "control" (including the terms "controlled by" and "under common
               -------                        -------------       ------------
     control with") means the possession, directly or indirectly or as trustee
     ------------
     or executor, of the power to direct or cause the direction of the
     management and policies of a person, whether through the ownership of
     voting securities, as trustee or executor, by contract or credit
     arrangement or otherwise;

          (e) "Environmental Laws" means any foreign or U.S. federal, state or
               ------------------
     local statute, regulation, rule, law or common law applicable to the
     Company or its operations relating to (A) releases or threatened releases
     of, or exposure to, Hazardous Substances or materials containing Hazardous
     Substances; (B) the manufacture, handling, transport, use, generation,
     treatment, storage or disposal of Hazardous Substances or materials
     containing Hazardous Substances; or (C) otherwise relating to pollution or
     protection of the environment or the protection of human health;

          (f) "Hazardous Substances" means (i) petroleum or any fraction
               --------------------
     thereof, asbestos or asbestos-containing material, polychlorinated
     biphenyls, urea formaldehyde foam insulation, radon gas, or (ii) any
     pollutant, contaminant, constituent, chemical, mixture, raw material,
     intermediate, product or by-product, industrial, solid, toxic, radioactive,
     infectious, disease-causing or hazardous substance, material, waste or
     agent as defined, prohibited, limited or regulated under any Environmental
     Laws;

          (g) "knowledge" or "known" means, as for the Company with respect to
               ---------      -----
     any matter in question, if Edward J. Mooney, Steven Newlin, W.S. Weeber,
     William Buchholz, William Parry, James Lambe, Suzzanne Gioimo, Anthony J.
     Sadowski, Steven Landsman and Sarah Garvey, after due inquiry, has actual
     knowledge of such matter;

          (h) "Material Adverse Effect" means any change, effect, condition,
               -----------------------
     event or circumstance that is materially adverse to the properties, assets,
     liabilities, operations, results of operations or condition (financial or
     otherwise) of the Company and the Subsidiaries, taken as a whole; provided,
                                                                       --------
     however, that "Material Adverse Effect" shall not include any change,
     -------
     effect, condition, event or circumstance arising out of or attributable to
     (i) any decrease in the market price of the shares of Common Stock (but not
     any change, effect, condition, event or circumstance underlying such
     decrease to the extent that it would otherwise constitute a Material
     Adverse Effect), (ii) changes, effects, conditions, events or circumstances
     that generally affect the industries in which the Company or the
     Subsidiaries operate (including legal and regulatory changes), (iii)
     general economic conditions or change, effects, conditions or circumstances
     affecting the securities markets generally or (iv) changes arising from the
     consummation of the Transactions or the announcement of the execution of
     this Agreement;

          (i) "Material Subsidiary" means a Subsidiary of the Company that is
               -------------------
     material to the financial condition or results of operation of the Company;
<PAGE>

                                       40

          (j) "person" means an individual, corporation, partnership, limited
               ------
     partnership, syndicate, person (including, without limitation, a "person"
     as defined in Section 13(d)(3) of the Exchange Act), trust, association or
     entity or government, political subdivision, agency or instrumentality of a
     government;

          (k) "SEC" means the U.S. Securities and Exchange Commission;
               ---

          (l)  "SEC Rules" means any rule, regulation or interpretation of the
                ---------
     SEC or the staff thereof; and

          (m) "Subsidiary" or "Subsidiaries" means an Affiliate of the Company
               ----------      ------------
     controlled by the Company, directly or indirectly, through one or more
     intermediaries.

          SECTION 9.04.  Severability.  If any term or other provision of this
                         ------------
Agreement is determined by a court of competent jurisdiction to be 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
full force and effect so long as the economic or legal substance of the
Transactions is not affected in any manner materially adverse to any party. 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 in a mutually acceptable manner in order that the
Transactions be consummated as originally contemplated to the fullest extent
possible.

          SECTION 9.05.  Entire Agreement; Assignment.  This Agreement
                         ----------------------------
constitutes the entire agreement among the parties with respect to the subject
matter hereof and supersedes, except as set forth in Sections 6.04(b) and 6.10,
all prior statements, agreements and undertakings, both written and oral, among
the parties, or any of them, with respect to the subject matter hereof.  This
Agreement shall not be assigned by operation of law or otherwise, except that
Parent and Purchaser may assign all or any of their rights and obligations
hereunder to any wholly owned subsidiary of Parent provided that no such
assignment shall relieve the assigning party of its obligations hereunder if
such assignee does not perform such obligations.

          SECTION 9.06.  Parties in Interest.  This Agreement shall be binding
                         -------------------
upon and inure solely to the benefit of each party hereto, and nothing in this
Agreement, express or implied, is intended to or shall confer upon any other
person any right, benefit or remedy of any nature whatsoever under or by reason
of this Agreement, other than Article II and Sections 6.06 and 6.07 (which are
intended to be for the benefit of each of the persons covered thereby and may be
enforced by such persons).

          SECTION 9.07.  Governing Law.  This Agreement shall be governed by,
                         -------------
and construed in accordance with, the laws of the State of New York applicable
to contracts executed in and to be performed in that State.  All actions and
proceedings arising out of or relating to this
<PAGE>

                                       41

Agreement shall be heard and determined in any federal or state court sitting in
the Borough of Manhattan, City of New York.

          SECTION 9.08.  Headings.  The descriptive headings contained in this
                         --------
Agreement are included for convenience of reference only and shall not affect in
any way the meaning or interpretation of this Agreement.

          SECTION 9.09.  Counterparts.  This Agreement may be executed in one or
                         ------------
more counterparts, and by the different parties hereto in separate counterparts,
each of which when executed shall be deemed to be an original but all of which
taken together shall constitute one and the same agreement.

          SECTION 9.10.  Waiver of Jury Trial.  EACH PARTY HERETO HEREBY
                         --------------------
IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR
COUNTERCLAIM (WHETHER BASED IN CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR
RELATING TO THIS AGREEMENT OR THE ACTIONS OF ANY PARTY IN THE NEGOTIATION,
ADMINISTRATION, PERFORMANCE AND ENFORCEMENT THEREOF.
<PAGE>

                                       42


          IN WITNESS WHEREOF, Parent, Purchaser and the Company have caused this
Agreement to be executed as of the date first written above by their respective
officers thereunto duly authorized.

                                    SUEZ LYONNAISE DES EAUX



                                    By   /s/ Philippe Brongniart
                                       ------------------------------------
                                       Name: Philippe Brongniart
                                       Title: Member of the Executive Board



                                    H2O ACQUISITION CO.



                                    By   /s/ Christian Maurin
                                       ------------------------------------
                                       Name: Christian Maurin
                                       Title: President



                                    NALCO CHEMICAL COMPANY



                                    By   /s/ E.J. Mooney
                                       ------------------------------------
                                       Name: E.J. Mooney
                                       Title: Chairman and CEO
<PAGE>

                                                                         ANNEX A
                                                                         -------

                            Conditions to the Offer
                            -----------------------

          Notwithstanding any other provision of the Offer, Purchaser shall not
be required to accept for payment or pay for any Shares tendered pursuant to the
Offer, and, on or after the initial scheduled expiration date of the Offer (as
contemplated by Section 1.01(a)), may amend the Offer and may postpone the
acceptance for payment of and payment for Shares tendered, if (i) the Minimum
Condition shall not have been satisfied, (ii) any applicable waiting period
under the HSR Act shall not have expired or been terminated prior to the
expiration of the Offer, or (iii) the Commission of the European Union shall not
have approved the Transactions under Regulation (EC) No. 4064/89, as amended, of
the Council of the European Union.  In addition, notwithstanding any other term
of the Offer, Purchaser shall not be required to accept for payment or pay for
any Shares tendered pursuant to the Offer, and, at any time on or after the date
of this Agreement and prior to the acceptance of Shares for payment, may
terminate or amend the Offer and may postpone the acceptance for payment of and
payment for Shares tendered if any of the following conditions shall exist:

          (a) there shall be instituted or pending any action or proceeding by
     any United States federal or state court or Republic of France court or
     United States or Republic of France governmental, administrative or
     regulatory authority or agency, in each case of competent jurisdiction over
     the Company or a Material Subsidiary (i) challenging or seeking to make
     illegal or otherwise directly or indirectly restrain, prohibit or make
     materially more costly the Offer or the Merger, (ii) seeking to prohibit or
     materially limit the ownership or operation by Parent of all or any
     material portion of the business or assets of the Company and its
     Subsidiaries taken as a whole or to compel Parent to dispose of or hold
     separately all or any material portion of the business or assets of Parent
     and its subsidiaries taken as a whole or the Company and its Subsidiaries
     taken as a whole or seeking to impose any material limitations on the
     ability of Parent or the Company to conduct or own any material portion of
     the business or assets of Parent and its subsidiaries taken as a whole or
     the Company and its Subsidiaries taken as a whole, in each case as a result
     of the Transactions, (iii) seeking to impose limitations on the ability of
     Parent or Purchaser to exercise effectively full rights of ownership of any
     Shares, including, without limitation, the right to vote any Shares
     acquired or owned by Parent or Purchaser on all matters properly presented
     to the Company's stockholders, including, without limitation, the approval
     and adoption of this Agreement and the Transactions, or (iv) seeking to
     require divestiture by Parent or Purchaser of any Shares;

          (b) there shall be any action taken, or any statute, rule, regulation,
     legislation, judgment, order or injunction, enacted, enforced, promulgated,
     amended or issued and applicable to (i) Parent, Purchaser, the Company or
     any Subsidiary of any of them or (ii) the Offer or the Merger, by any
     United States federal or state or Republic of France legislative body,
     court, government or governmental, administrative or regulatory
<PAGE>

                                      A-2

     authority or agency, other than the routine application of the waiting
     period provisions of the HSR Act to the Offer or to the Merger, which would
     reasonably be expected to directly or indirectly, result in any of the
     consequences referred to in clauses (i) through (iv) of paragraph (a)
     above;

          (c) any representation or warranty of the Company in this Agreement
     shall not be true and correct so as to have a Material Adverse Effect, in
     each case as if such representation or warranty was made as of such time on
     or after the date of this Agreement (except for representations and
     warranties made as of a specific date which shall be true and correct as of
     such date so as not to have a Material Adverse Effect); provided, however,
                                                             -----------------
     that for purposes of this paragraph (c), if any representation or warranty
     of the Company in this Agreement is qualified in any respect by materiality
     or the words "Material Adverse Effect", such materiality or Material
     Adverse Effect qualification shall be ignored for purposes of this
     paragraph (c);

          (d) the Company shall have failed to perform, or comply with, any
     agreement or covenant of the Company to be performed or complied with by it
     under this Agreement, which failure has a Material Adverse Effect;

          (e) there shall have occurred (i) any general suspension of trading
     in, or limitation on prices for, securities on the New York Stock Exchange,
     Inc. and such suspension shall continue for six consecutive Business Days
     (excluding any coordinated trading halt triggered solely as a result of a
     specified decrease in a market index), (ii) a declaration of a banking
     moratorium or any suspension of payments in respect of banks in the United
     States or France, and such moratorium or suspension shall continue for six
     consecutive Business Days, (iii) any material limitation (whether or not
     mandatory) by any United States Federal or French governmental authority or
     agency on the extension of credit by banks or other lending institutions
     and such limitation shall continue for six consecutive Business Days;

          (f) this Agreement shall have been terminated in accordance with its
     terms; or

          (g) Purchaser and the Company shall have agreed that Purchaser shall
     terminate the Offer or postpone the acceptance for payment of or payment
     for Shares thereunder;

     provided that, with respect to paragraphs (a), (b), (c)  and (d) above,
     -------- ----
     Purchaser shall give the Company advance written notice of any intention by
     Purchaser to assert the nonsatisfaction of any of the conditions set forth
     in such paragraphs (a), (b), (c) or (d), which notice shall describe in
     reasonable detail the basis for the belief that any such condition has not
     been satisfied; and, provided further that (i) in the event of any action,
                          -------- -------
     proceeding, judgment, order or injunction contemplated by such paragraphs
     (a) or (b), the Purchaser shall not terminate the Offer under such
     paragraphs (a) or (b), nor exercise any
<PAGE>

                                      A-3

     related rights to terminate this Agreement, unless and until such action,
     proceeding, judgment, order or injunction shall have become final and
     nonappealable and (ii) if any breach or failure to perform contemplated by
     any of such paragraphs (c) and (d) is capable of being cured through the
     exercise by the Company of its reasonable best efforts and for so long as
     the Company continues to use such reasonable best efforts to cure such
     breach or failure to perform, the Purchaser shall not terminate the Offer
     under such paragraphs (c) or (d) or exercise any related right to terminate
     this Agreement, in either case for a period not to exceed 10 Business Days.

          The foregoing conditions are for the benefit of Purchaser and Parent
and may be asserted by Purchaser or Parent regardless of the circumstances
giving rise to any such condition or, subject to the terms of this Agreement,
may be waived by Purchaser or Parent, in whole or in part, at any time and from
time to time in their discretion.  The failure by Parent or Purchaser at any
time to exercise any of the foregoing rights shall not be deemed a waiver of any
such right; the waiver of any such right with respect to particular facts and
other circumstances shall not be deemed a waiver with respect to any other facts
and circumstances; and each such right shall be deemed an ongoing right that may
be asserted at any time and from time to time.
<PAGE>

                                                                         ANNEX B
                                                                         -------

                           Employee Benefits Matters
                           -------------------------

          Parent and the Company agree to the following with respect to the
compensation and benefits programs of Parent, the Company and the Subsidiaries:

          1.   Continuation of Benefits. For a period of one year following the
               ------------------------
Effective Time, Parent, the Company and the Subsidiaries shall continue and
maintain the employee benefit plans and programs of the Company and the
Subsidiaries for active and retired employees and former directors of the
Company and the Subsidiaries as in effect immediately prior to the Effective
Time; provided that Parent, the Company and the Subsidiaries shall not be
obligated to continue the Supplemental Management Incentive Plan, the
Performance Share Plan, the Company Stock Option Plans, the 1984 Restricted
Stock Plan, the Employee Stock Ownership Plan, the Company Common Stock
investment option contained in the Profit Sharing, Investment and Pay Deferral
Plan, or any other plan or program providing for compensation, in the form of,
or based on the value of the stock of Parent, the Company or the Subsidiaries,
or to provide any other incentive plan or benefits in lieu thereof.
Notwithstanding the foregoing, during the aforesaid period of one year following
the Effective Time, the Parent, the Company and the Subsidiaries shall give due
consideration to providing a reasonable level of equity based compensation.
From and after the Effective Time, Parent shall honor, and shall cause the
Company and the Subsidiaries to honor, in accordance with their terms, all
contracts, arrangements, policies, plans and commitments of the Company and the
Subsidiaries in accordance with such terms that are applicable to any current or
former employees or directors of the Company or the Subsidiaries and that have
been disclosed or made available to Parent pursuant to the provisions of Section
3.10 of this Agreement.  Parent and the Company acknowledge and agree that the
transactions contemplated by this Agreement shall constitute, as of the
Effective Time, a "Change of Control" as such term is defined in the Company
Change of Control Arrangements.

          2.   Service Recognition.  To the extent that service is relevant for
               -------------------
purposes of eligibility, participation or vesting under any employee benefit
plan, program or arrangement established or maintained by Parent, the Company or
any of their respective subsidiaries, employees of the Company and the
Subsidiaries shall be credited with service accrued prior to the Effective Time
with the Company or any of the Subsidiaries, as the case may be.  Employees of
the Company and the Subsidiaries shall be credited with service accrued prior to
the Effective Time to the extent service is relevant for purposes of benefit
accrual (a) with respect to plans, programs or arrangements established or
maintained by Parent, the Company or the Subsidiaries covering predominantly
employees employed in the United States, and, (b) with respect to plans,
programs, or arrangements maintained by the Company or the Subsidiaries (and not
by the Parent or its Affiliates other than the Company and the Subsidiaries)
covering predominantly persons
<PAGE>

                                      B-2

employed outside the United States. Notwithstanding the foregoing, the crediting
of any service described in this Section 2 of Annex B shall not operate to
duplicate any benefit.

          3.   Management Incentive Plan.  With respect to the payment of
               -------------------------
bonuses under the Company's Management Incentive Plan (the "MIP") for the fiscal
                                                            ---
year ending December 31, 1999 (the "1999 Fiscal Year"), the Company shall pay
                                    ----------------
participants in the MIP whose employment is terminated by Parent, the Company or
any of the Subsidiaries without Cause (as defined in Section 4 of this Annex B)
on or after the Effective Time and prior to January 1, 2000 a bonus under the
MIP equal to the pro rata portion of the bonus such participant would have
earned under the MIP for the 1999 Fiscal Year had such participant remained
employed through the end of the 1999 Fiscal Year.  Any payment described in the
immediately preceding sentence shall be made following the end of the 1999
Fiscal Year, at the same time as such payment would have been made had such
person remained employed by the Company.  Notwithstanding the provisions of this
Section 3 of Annex B, any person covered by a Key Executive Agreement which
remains in effect on the date of such person's termination of employment
(without Cause) shall receive the payment provided under the Key Executive
Agreement with respect to any bonus under the MIP in lieu of the pro rata
payment provided for in this Section 3.  The MIP shall be administered by the
Company with respect to the 1999 Fiscal Year in accordance with past practice.

          4.   Restricted Stock Unit and Performance Awards.  (a) Prior to the
               --------------------------------------------
acceptance of the Shares by the Purchaser pursuant to the Offer, each restricted
stock unit award under the Company's 1984 Restricted Stock Plan or the Employee
Stock Compensation Plan and each performance award assigned in 1995 under the
Company's Performance Share Plan (including restricted stock awarded in the 1995
to 1998 performance cycle) (collectively the "Current Stock Awards") shall
become fully and immediately payable or distributable and the restrictions
thereon shall lapse.  At the Effective Time, each holder of a Current Stock
Award shall be paid in full satisfaction of such Current Stock Award a cash
payment in an amount in respect thereof equal to the product of (i) the Merger
Consideration and (ii) the number of shares of Common Stock subject to such
Current Stock Award, less any income or employment tax withholding required
under the Code or any provision of state or local law.

          (b) Each performance award assigned in the 1997 to 1999 performance
cycle or the 1998 to 2000 performance cycle under the Company's Performance
Share Plan (collectively the "Deferred Performance Awards") shall be awarded
assuming a performance level of 100% of the target award and shall vest and
become payable on the following date (referred to herein as the "Vesting Date"):
(i) on the third anniversary of the Effective Time, provided the executive to
whom such award was made has been continuously employed, including any leaves of
absence authorized by the Company, by the Company or an Affiliate of the Company
from the Effective Time until such date or (ii) upon the death or Disability or
Retirement of the executive, the termination of the executive's employment by
the Company and its Affiliates without Cause or the termination by the executive
of his or her employment with the
<PAGE>

                                      B-3

Company and its Affiliates for Good Reason, provided such death, Disability,
Retirement or termination occurs on or after the Effective Time and prior to the
third anniversary of the Effective Time. On the Vesting Date, each holder of a
Deferred Performance Award shall be paid in full satisfaction of such Deferred
Performance Award a cash payment in an amount in respect thereof equal to the
product of (x) the Merger Consideration and (y) the number of shares of Common
Stock subject to such Deferred Performance Award. For purposes of Sections 3 and
4(b) of Annex B, "Disability", "Cause" and "Good Reason" shall have the
following meanings:

             (i)   "Disability" shall mean the executive's physical or mental
        incapacity which (A) would entitle the executive to disability benefits
        under the Company's or Affiliate's long-term disability plan by which
        the executive is covered or (B) as a result of which, in the judgment of
        a physician appointed by the Company, the executive is unable to perform
        the duties of his or her position with the Company and its Affiliates
        for 180 days during any continuous period of 365 days.

             (ii)  "Cause" shall mean (A) the executive's conviction of, plea of
        nolo contendere to, or written admission of his commission of, a felony,
        (B) any act by the Executive involving moral turpitude, fraud or
        misrepresentation with respect to his duties for the Company or its
        Affiliates; or (C) gross negligence or willful misconduct on the part of
        the executive in the performance of his or her duties to the Company or
        its Affiliates.

             (iii) "Good Reason" means (A) any termination of employment of the
        executive with the Company and its Affiliates or any resignation from
        employment with the Company and its Affiliates by the executive
        following a reduction in his or her base salary in effect on the
        Effective Time or following the Company's material breach of any of its
        agreements set forth in this Annex B or (B) any other termination of
        employment of the executive with the Company and its Affiliates which is
        approved in writing by the Company.

             (iv)  "Retirement" means an executive's termination of employment
        on or after the date he or she attains age 62.

       (c) At the Effective Time, each restricted stock unit award under the SAP
letter agreements shall be converted to a right to receive cash equal to the
product of (i) the Merger Consideration and (ii) the number of shares of Common
Stock subject to such restricted stock unit award.  The foregoing amount of cash
shall be paid out pursuant to the terms of the SAP letter agreement, to the
extent that, and at the same time as, such restricted stock unit would
otherwise, in the absence of the transactions contemplated by this Agreement,
have been vested and paid out.
<PAGE>

                                      B-4

     (d) The provisions of this Section 4 shall not operate to duplicate any
amounts payable to the executive under his or her Key Executive Agreement.

          5.   Deferred Compensation Plans.  Prior to the acceptance of the
               ---------------------------
Shares by the Purchaser pursuant to the Offer, all stock units, share units or
stock equivalent units held under the Company's deferred compensation plan for
directors or held under the Agreement to Restore Benefits Reduced by ERISA-
Related Limits (the "Company Deferred Compensation Plans") (each a "Company
                     -----------------------------------            -------
Stock Unit") shall be converted into an obligation to pay cash with a value
- ----------
equal to the product of (i) the Merger Consideration and (ii) the number of
shares of Common Stock subject to such Company Stock Unit.  With respect to the
obligation to pay cash in respect of the conversion of Company Stock Units under
the Company Deferred Compensation Plans, the obligation shall be payable or
distributable in accordance with the terms of the plan or arrangement relating
to the Company Stock Unit.

          6.   Directors' Retirement Policy.  For purposes of calculating the
               ----------------------------
pension benefits payable under the Company's 1993 retirement policy for non-
employee directors (the "Directors' Retirement Policy"), each non-employee
                         ----------------------------
director who is serving as a member of the Board as of the Effective Date and
who has less than five years of service as a member of the Board, shall be
credited with five years of service; provided, however, that each non-employee
                                     --------  -------
director as of the Effective Date who has at least five years of service as a
member of the Board, but has less than ten years of service, shall be credited
with ten years of service.  In addition, the Parent, the Company and the
Subsidiaries shall either (i) continue and maintain the Directors' Retirement
Policy as in effect on the Effective Date until each non-employee director
entitled to receive a pension benefit calculated thereunder (whether active or
retired) has received his or her pension benefit, or (ii) purchase or cause to
be purchased an annuity contract for each such non-employee director that
provides for the payment of such pension benefit.

          7.   Amendments to Tax-Qualified Plans.  (a) Prior to the acceptance
               ---------------------------------
of the Shares by the Purchaser pursuant to the Offer:

             (i)   The Company shall amend or cause to be amended its Employee
        Stock Ownership Plan (the "ESOP") and the trust agreement establishing
        the trust under the ESOP to provide that the net proceeds in the
        Suspense Account (as defined in the ESOP) resulting from the disposition
        of the Shares held in such trust and repayment of the ESOP Loans (as
        defined in the ESOP) will be immediately allocated to Participants'
        Accounts (as defined in the ESOP) using the ratio of the balance of each
        such Participant's Account to the Accounts of all Participants.

             (ii)  The Company shall amend or cause to be amended its Profit
        Sharing, Investment and Pay Deferral Plan and the trust agreement
        establishing the trust under such plan to substantially provide that,
        subject to applicable law, (1) the trustee of such trust shall vote
        shares of Common Stock allocated to a participant's account under such
<PAGE>

                                      B-5

        plan in accordance with written instructions given by such participant;
        (2) any such shares held in such trust for which the trustee receives no
        such voting instructions shall be voted by the trustee in the same ratio
        as the shares held in the trust for which the trustee receives voting
        instructions; (3) in the event of a tender offer or exchange offer for
        the shares of Common Stock held in such trust, the trustee shall tender
        or exchange the shares of Common Stock held in such trust which are
        allocated to a plan participant's account in accordance with written
        instructions given by such participant; and (4) any such shares held in
        such trust for which the trustee receives no such tender or exchange
        instructions shall be tendered or exchanged by the trustee in the same
        ratio as the shares held in the trust for which the trustee receives
        such tender or exchange instructions.

             (iii) The Company shall amend its Retirement Income Plan for
        Eligible Employees to delete Article 20 thereof in its entirety.

             (iv)  The Company shall adopt such other amendments to the plans
        referenced in this Section 7, and any related agreements or instruments,
        or obtain any consents, as are necessary or appropriate to effectuate
        the transactions contemplated by this Agreement.

        (b) The Company and the Parent shall cooperate and take all reasonable
        steps to share in advance information to effect the transactions
        contemplated by this Annex B.

<PAGE>

Goldman, Sachs & Co., 85 Broad Street, New York, New York  10004
Tel:  212-902-1000

                                                                  Exhibit (c)(2)

PERSONAL AND CONFIDENTIAL
- -------------------------


April 13, 1999


Degremont S.A.
183, Avenue du 18 Juin 1940
92508 Rueif-Mafmaisoin
France

Attn:  Mr. Christian Morin
       President Directeur General


Dear Mr. Morin:

In connection with your consideration of a possible transaction with Nalco
Chemical Company (the "Company"), you have requested information concerning the
Company.  As a condition to your being furnished such information, you agree to
treat any information concerning the Company (whether prepared by the Company,
its advisors or otherwise) which is furnished to you by or on behalf of the
Company, its advisors or otherwise) which is furnished to you by or on behalf of
the Company (herein collectively referred to as the "Evaluation Material") in
accordance with the provisions of this letter and to take or abstain from taking
certain other actions herein set forth.  The term "Evaluation Material" dies not
include information which (i) is already in your possession, provided that such
information is not known by you to be subject to another confidentiality
agreement with or other obligation of secrecy to the Company or another party,
or (ii) becomes generally available to the public other than as a result of a
disclosure by you or your directors, officers, employees, agents or advisors, or
(iii) becomes available to you on a non-confidential basis from a source other
than the Company or its advisors, provided that such source is not known by you
to be bound by a confidentiality agreement with or other obligation of secrecy
to the Company or another party.

You hereby agree that the Evaluation Material will be used solely for the
purpose of evaluating a possible transaction between the Company and you, and
that such information will be kept confidential by you and your advisors;
provided, however, that (i) any of such information may be disclosed to your
directors, offices and employees and representatives of your advisors who need
to know such information for the purpose of evaluating any such possible
transaction between the Company and you (it being understood that such
directors, officers, employees and representatives shall be informed by you of
the confidential nature of such information and shall

                                       1
<PAGE>

Degremont S.A.
April 13, 1999
Page 2


be directed by you to treat such information confidentially), and (ii) any
disclosure of such information may be made to which the Company consents in
writing.

You hereby acknowledge that you are aware and that you will advise such
directors, officers, employees and representatives who are informed as to the
matters which are the subject of this letter, that the United States securities
laws prohibit any person who has received from an issuer material, non-public
information concerning the matters which are the subject of this letter from
purchasing or selling securities of such issuer or from communicating such
information to any other person under circumstances in which it is reasonably
foreseeable that such person is likely to purchase or sell such securities.

In addition, without the prior written consent of the Company, you will not, and
will direct such directors, officers, employees and representatives not to,
disclose to any person either the fact that discussions or negotiations are
taking place concerning a possible transaction between the Company and you or
any of the terms, conditions or other facts with respect to any such possible
transaction, including the status thereof.

You hereby acknowledge that the Evaluation Material is being furnished to you in
consideration of your agreement that you will not propose to the Company or any
other person any transaction between you and the Company and/or its security
holders or involving any of its securities or security holders unless the
Company shall have requested in writing that you make such a proposal, and that
you will not acquire, or assist, advise or encourage any other persons in
acquiring or attempting to acquire, directly or indirectly, control of the
Company (including by way of election of any directors of the Company) or any of
the Company's securities, businesses or assets for a period of three years from
the date of this letter unless the Company shall have consented in advance in
writing to such acquisition or attempted acquisition.  You also agree that the
Company shall be entitled to equitable relief, including injunction, in the
event of any reach of the provisions of this paragraph and that you shall not
oppose the granting of such relief.

Although the Company has endeavored to include in the Evaluation Material
information known to it which it believes to be relevant for the purpose of your
investigation, you understand that neither the Company nor any of its
representatives or advisors have made or make any representation or warranty as
to the accuracy or completeness of the Evaluation Material.  You agree that
neither the Company nor its representatives or advisors shall have any liability
to you or any of your representatives or advisors resulting from the use of the
Evaluation Material.

In the event that you do not proceed with the transaction which is the subject
of this letter within a reasonable time, you shall promptly deliver tot he
Company all written Evaluation Material and any other written material
containing or reflecting any information in the Evaluation Material (whether
prepared by the Company, its advisors or otherwise) and will not retain any
copies, extracts or other reproductions in whole or in part of such written
material.  All documents, memoranda, notes and reproductions in whole or in part
of such written material.  All documents, memoranda, notes and other writings
whatsoever prepared by you or your advisors abased on the

                                       2
<PAGE>

Degremont S.A.
April 13, 1999
Page 3


information in the Evaluation Material shall be destroyed, and such destruction
shall be certified in writing to the Company by an authorized officer
supervising such destruction.

You agree that unless and until a definitive agreement between the Company and
you with respect to any transaction referred to in the first paragraph of this
letter has been executed and delivered, neither the Company nor you will be
under any legal obligation of any kind whatsoever with respect to such a
transaction by virtue of this or any written or oral expression with respect to
such a transaction by any of its directors, officers, employees, agents or any
other representatives or its advisors or representatives thereof except, in the
case of this letter, for the matters specifically agreed to herein.  The
agreement set forth in this paragraph may be modified or waived only by a
separate writing by the Company and you expressly so modifying or waiving such
agreement.

This letter shall be governed by, and construed in accordance with, the laws of
the State of New York.

Very truly yours,

NALCO CHEMICAL COMPANY

By: /s/ Goldman, Sachs & Co.
   --------------------------------------
  Goldman, Sachs & Co.
  on behalf of NALCO CHEMICAL COMPANY

Confirmed and Agreed to:

DEGREMONT S.A.

By: /s/ Pascal Remy
   -------------------------------------

Date: 15/04/99
     -----------------------------------

                                       3

<PAGE>

                                                                  Exhibit (c)(3)


                        [FORM OF EMPLOYMENT AGREEMENT]


                             Nalco Chemical Company
                                One Nalco Center
                        Naperville, Illinois 60563-1198
                                 (630) 305-1000



[DATE]

[Executive]
Nalco Chemical Company
One Nalco Center
Naperville, Illinois 60563-1198

Dear [Executive]

     Upon completion of the proposed merger (the "Merger") between H2O
Acquisition Co. (the "Purchaser"), a whollyowned subsidiary of Degremont S.A.
(the "Parent"), and Nalco Chemical Company (the "Company"), Parent shall
cause the Company to offer you employment with the Company on the terms and
conditions described in the attached "Terms of Employment Contract between Nalco
Chemical Company and [Executive]," which are incorporated into this letter
agreement (the "Agreement") by reference.  By signing this Agreement you hereby
accept employment with the Company on such terms and conditions.  This offer of
employment is conditioned upon the completion of the Merger and shall become
effective at the Effective Time (as defined in the Agreement and Plan of Merger
by and among the Parent, Purchaser and the Company (the "Merger Agreement")) of
the Merger.

     You, as well as the Parent and Purchaser, agree to enter into a more
definitive employment agreement that reflects these terms and conditions
promptly after the date of this Agreement.
<PAGE>

     In the event of any inconsistency between the terms of this Agreement and
the terms of the Merger Agreement, the terms of this Agreement will control.

                                        Very truly yours,


Date:______________________________     DEGREMONT S.A.

                                        By:__________________________
                                           Name:
                                           Title:


Date:______________________________     H2O ACQUISITION CO.

                                        By:__________________________
                                           Name:
                                           Title:

Accepted and agreed to:

____________________________
[Executive]

Date: ________________


                                      -2-
<PAGE>

<TABLE>
<CAPTION>
1.  Settlement of Key Executive Agreements*
    ---------------------------------------
<S>                                       <C>
    .  3 Times Base Salary          >
                                    >
                                    >     Payout in  cash at time of change in control ("CIC")
    .  3 Times Regular Management   >
       Incentive Plan ("MIP")       >



    .  3 Times Supplemental MIP     >     Deferred for three years in cash with interest.
                                    >     To vest and be paid at end of three years if
                                    >     employed or in event of prior death,
                                    >     disability, termination by Company without
                                    >     "cause" or by executive for "good reason"
                                    >     or retirement on or after age 62
    .  97/98 Outstanding            >     assuming a performance level of 100%
       Performance Share Awards     >     of the target award



    .  Outstanding Restricted Stock >
       including 1995 Performance   >
       Share Plan                   >
                                    >     Payout in cash at time of CIC
    .  Stock Options                >
                                    >
    .  280G Tax Gross-up Payment    >


2.   Provisions
     ----------

     Duration                             .  Three years
                                          .  One-year evergreen after three years
                                          .  Six months' notice of non-renewal

     Position                             .  Chief Executive Officer for Mr. Mooney; Senior
                                             Executive for other executives
                                          .  Responsibilities and duties as assigned by Board
                                             for Mr. Mooney and by the Board and Chief Executive
                                             Officer for other executives

     Compensation                         .  Current salary with opportunity for increase
                                          .  Compensation opportunities comparable to those
                                             provided to similar senior executives
</TABLE>
- ---------------

*  Payments to be excluded from pension and benefit calculations.
<PAGE>

<TABLE>
<S>                                 <C>
                                    .  Participation in all incentive and benefit plans
                                       provided to similar senior executives

Retention Payment                   .  Two times sum of salary plus regular target MIP
                                       bonus (as of June 22, 1999) payable in cash if
                                       employed by Company three years from date of CIC;
                                       payment to be excluded from pension and benefit
                                       calculations and from 280G gross-up obligation

Termination Provisions*
 .  Death, Disability and            .  Accrued Amounts**
   Retirement                       .  Long term incentives in accordance with plan
                                       provisions

 .  By Company without "Cause" or    .  Accrued Amounts
   Resignation by Executive for     .  Long term incentives in accordance with plan
   "Good Reason"***                    provisions
                                    .  Two times (for Messrs. Buchholz, Lambe, Mooney,
                                       Newlin and Weeber) and 1.5 times (for Messrs. Brannon,
                                       Burns, Kahler and Roe) salary plus regular target MIP
                                       bonus; not to exceed age 65
                                       -  Payment to be offset by Retention Payment if such
                                          termination occurs within two years of receipt of
                                          Retention Payment
                                    .  Additional pension credit equal to three years less
                                       number of years worked from date of CIC
                                    .  Welfare benefits continuation for same period

 .  By Company for "Cause" or        .  Accrued salary
   Resignation without "Good        .  Unpaid earned amounts
   Reason"***


Restrictive Covenants               .  Non-competition and non-solicitation of customers
                                       and employees during employment and for two years
                                       thereafter
                                    .  Perpetual non-disclosure, non-disparagement and
                                       availability for litigation support

Taxes                               .  Full CIC gross-up for current merger (excluding
                                       Retention Payment); for future CIC, full CIC gross-up
                                       (excluding Retention Payment), but only in the event
                                       of termination without "Cause" or resignation for
                                       "Good Reason" following future CIC

Elective Deferral                   .  Flexible elective deferral plan with tax-sheltered
                                       investment alternatives
</TABLE>
- --------------------

*    Applicable both prior and subsequent to any future change in control;
     payments to be excluded for pension and benefit calculation purposes.

**   Salary and pro rata bonus at target for year of termination plus unpaid
     earned amounts.

***  "Good Reason" and "Cause" similar to definition in merger agreement.
<PAGE>

<TABLE>
<S>                                 <C>
Legal Fees and Expenses             .  Reimbursement of reasonable costs unless actions
                                       found to be in bad faith or frivolous

Settlement of Disputes              .  Arbitration; injunctive relief
</TABLE>


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