Document:

EXHIBIT 10.25

                  LIMITED LIABILITY COMPANY OPERATING AGREEMENT

                                       OF

                                    NALCO LLC

                            DATED AS OF MAY 17, 2004

     This LIMITED LIABILITY COMPANY OPERATING AGREEMENT (the "Agreement") dated
as of May 17, 2004 (the "Effective Date") concerning Nalco LLC (the "Company"),
a Delaware limited liability company, is entered into by and among the Sponsor
Members (as defined herein), the Investor Members (as defined herein), and the
Management Members (as defined herein).

                                    RECITALS

     WHEREAS, the Company was originally formed on May 3, 2004, as a limited
liability company pursuant to the Act by filing a Certificate of Formation of
the Company (as it may be amended or modified from time to time, the
"Certificate") with the office of the Secretary of State of the State of
Delaware.

     WHEREAS, Nalco Holdings LLC, a Delaware limited liability company and an
indirect subsidiary of the Company ("Nalco Holdings"), pursuant to a Stock
Purchase Agreement dated as of August 31, 2003 among Nalco Holdings, Leo Holding
Company and Nalco International S.A.S. acquired Ondeo Nalco Company ("Nalco")
and certain subsidiaries of Nalco International S.A.S. (together with Nalco, the
"Acquired Business").

     WHEREAS, Nalco Investment Holdings LLC, a Delaware limited liability
company and an indirect subsidiary of the Company ("NIH"), was formerly directly
owned by certain of the Members.

     WHEREAS, the Members (as defined herein) wish to provide for the
organization and governance of the Company.

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

                                   ARTICLE I

                                  ORGANIZATION

     Section 1.01. Certificate. The Certificate has been prepared, executed and
filed by an authorized person within the meaning of the Act, in the Office of
the Secretary of State of the State of Delaware. The rights and obligations of
the Members shall be determined pursuant to the Act and this Agreement. To the
extent that the rights or obligations of any Member are different by reason of
any provision of this Agreement than they would be in the absence of such
provision, this Agreement shall, to the extent permitted by the Act, control.

     Section 1.02. Name. In accordance with, and subject to the provision of
this Agreement, the name of the Company shall be "Nalco LLC" and the Company may
conduct business under that name or any other name hereafter approved by the
Board. Each Officer is considered an authorized person within the meaning of the
Act who may execute, deliver, and file any amendment and/or restatement of the
Certificate as necessary to change the name of the Company consistent with the
provisions of this Section 1.02.

     Section 1.03. Term. The term of the Company commenced as of the date of the
filing of the Certificate. The term of the Company shall continue until the
Company is dissolved

in accordance with the provisions of Article VIII hereof. The existence of the
Company as a separate legal entity shall continue until the cancellation of the
Certificate as provided in the Act.

     Section 1.04. Office and Agent. The principal place of business of the
Company shall be such place or places as the Board may determine from time to
time. The registered agent and office in the State of Delaware shall be The
Corporation Trust Company, Corporation Trust Center, 1209 Orange Street,
Wilmington, Delaware or as hereafter determined by the Board in accordance with
the Act.

     Section 1.05. Qualification in Other Jurisdictions. The Officers shall
cause the Company to be qualified or registered under foreign entity or assumed
or fictitious name statutes or similar laws in any jurisdiction in which the
Company owns property or transacts business to the extent such qualification or
registration is necessary or advisable in order to protect the limited liability
of the Members or to permit the Company lawfully to own property or transact
business. In connection with the foregoing, any Officer, acting alone, shall
execute, deliver and file any certificates (and any amendments and/or
restatements thereof) necessary for the Company to qualify to do business in a
jurisdiction in which the Company may wish to conduct business.

                                   ARTICLE II

                              CAPITAL CONTRIBUTIONS

     Section 2.01. Initial Capital Contributions. Each Member has made to the
Company a Capital Contribution in the amount listed on Schedule A. In exchange
for their respective Capital Contributions, the Members received the number and
classes of Units set forth opposite such Member's name on Schedule A. The
Company may in its discretion issue certificates to the Members representing the
Units held by each Member. The initial Capital Account of each Member described
above shall equal the amount of such Member's initial aggregate Capital
Contributions, as shown on Schedule A.

     Section 2.02. Additional Capital Contributions. No Members shall be
required or permitted to make any additional Capital Contributions without the
unanimous consent of the Board.

     Section 2.03. Additional Members. By approval of the Board in accordance
with Section 3.07(a), the Company is authorized to issue additional Membership
Interests, Units or other economic interests in the Company ("Additional
Interests") to any Person in such amounts, on such terms, and having such
characteristics as the Company Board, in accordance with Section 3.07(a), may
determine. Each Person who subscribes for any of the Additional Interests shall,
by approval of the Company Board, in accordance with Section 3.07(a), be
admitted as a Member of the Company at the time such Person (i) executes this
Agreement or a counterpart of this Agreement or (ii) is named as a Member in a
written agreement with the Company to such effect or in the permanent records of
the Company, effective as of the earlier such time. Unless provided otherwise by
the Board, the legal fees and expenses associated with any such admission shall
be borne by the Member.

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                                  ARTICLE III

                        GENERAL GOVERNANCE AND MANAGEMENT

     Section 3.01. Purposes and Powers. The parties hereto agree and acknowledge
that the Company has been organized for the purpose of managing the business and
affairs of the Acquired Business. Except as specifically provided otherwise in
this Agreement, the management and control of the business and affairs of the
Company shall to the maximum extent permitted under Applicable Law be vested
exclusively in a Board of Directors (the "Board") which shall possess all rights
and powers of managers as provided in the Act and otherwise by law. Except as
otherwise expressly provided for herein, the Members hereby consent to the
exercise by the Board of all such powers and rights conferred on them by the Act
or otherwise by law with respect to the management and control of the Company.
No Member and no Representative (as defined in Section 3.02), in its capacity as
such, shall have any power to act for, sign for, or do any act that would bind
the Company.

     Section 3.02. Establishment of Board of Directors. (a) The Board shall
initially include two (2) representatives appointed by BCP IV (the "BCP
Representatives"), two (2) representatives appointed by Apollo V (the "Apollo
Representatives") and two (2) representatives appointed by GSCP (the "GSCP
Representatives", and collectively with the BCP Representatives and the Apollo
Representatives, the "Representatives").

     (b) The initial Board shall consist of the following members:

         BCP Representatives:       Chinh E. Chu
                                    Paul H. O'Neill

         Apollo Representatives:    Leon D. Black
                                    Joshua J. Harris

         GSCP Representatives:      Richard A. Friedman
                                    Sanjeev K. Mehra

         Other Board Member:        William H. Joyce

     Section 3.03. Number of Directors. From and after the Effective Date, at
each annual or special meeting of holders of Units at, or the taking of action
by written consent of holders of Units with respect to which any Representatives
are to be elected, each Investor Group shall have the right (but not the
obligation) pursuant to this Agreement to nominate and cause to be elected to
the Board that number of Representatives which, when added to the number of
Representatives who are then Representatives of such Investor Group and who will
continue to serve as directors without regard to the outcome of the election at
such meeting or by such consent, is not more than (x) two, in the event that
such Investor Group beneficially owns an amount of outstanding Class A Units
which shall equal at least 33 1/3% (48.5% in the case of the GS Investor Group)
of such Investor Group's Initial Equity Stake (it being understood and agreed
that so long as (i) BCP IV (directly or indirectly) owns any Class A Units and
the BCP Investor Group shall be entitled to nominate one or more
Representatives, BCP IV shall have the right to nominate

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one such BCP Representative, (ii) Apollo V (directly or indirectly) owns any
Class A Units and the Apollo Investor Group shall be entitled to nominate one or
more Representatives, Apollo V shall have the right to nominate one such Apollo
Representative, (iii) GSCP (directly or indirectly) owns any Class A Units and
the GS Investor Group shall be entitled to nominate one or more Representatives,
GSCP shall have the right to nominate one such GSCP Representative) or (y) one,
in the event that such Investor Group collectively beneficially owns an amount
of outstanding Class A Units which shall equal at least 10% (14.5% in the case
of the GS Investor Group) of such Investor Group's Initial Equity Stake (it
being understood and agreed that, so long as (i) BCP IV (directly or indirectly)
owns any Class A Units and the BCP Investor Group shall be entitled to nominate
one or more Representatives, BCP IV shall have the right to nominate one such
BCP Representative, (ii) Apollo V (directly or indirectly) owns any Class A
Units and the Apollo Investor Group shall be entitled to nominate one or more
Representatives, Apollo V shall have the right to nominate one such Apollo
Representative, or (iii) the GS Investor Group shall be entitled to nominate one
or more Representatives and GSCP (directly or indirectly) owns any Class A
Units, GSCP shall have the right to nominate such GSCP Representative).
Notwithstanding anything to the contrary herein, for as long as an Investor
Group beneficially owns any amount of Class A Units, such Investor Group shall
have the right (but not the obligation) pursuant to this Agreement to have an
individual designated by such Investor Group (an "Observer") attend all meetings
of the Board; provided, however, that such Observer shall not have the right to
participate in any vote, consent or other action of the Board, nor shall such
Observer's vote, consent or other action be required for any vote, consent or
other action of the Board. Each Member agrees to take all action necessary to
promptly elect to the Board the Representatives or other Persons nominated
pursuant to this Section 3.03. In addition, the Investor Groups may, subject to
approval by the Board in accordance with the requirements of Section 3.07(a),
nominate such members of management and other outside directors to serve as
members of the Board, provided such Persons shall not be considered
Representatives for purposes of this Agreement, and such Persons may be removed,
in accordance with Section 3.07(a), at any time with or without cause. Any
increases in the number of Representatives shall be apportioned amongst the
Investor Groups such that for each Investor Group there is no change to the
ratio of the number of Representatives that such Investor Group is entitled to
nominate relative to the overall number of Representatives of all Investor
Groups.

     Section 3.04. Vacancies; Removal. (a) In the event that any Representative
shall cease to serve as a member of the Board for any reason other than the fact
that the applicable Investor Group no longer has a right to nominate such
Representative, as provided in Section 3.03, the vacancy resulting thereby shall
be filled by a Representative designated by the Investor Group that appointed or
nominated such Representative (it being understood and agreed that, in the case
of a vacancy in respect of a Representative appointed or nominated by (i) BCP
IV, so long as BCP IV holds any Class A Units, such vacancy shall be filled by a
Representative designated by BCP IV, (ii) Apollo V, so long as Apollo V holds
any Class A Units, such vacancy shall be filled by a Representative designated
by Apollo V, or (iii) GSCP, so long as GSCP holds any Class A Units, such
vacancy shall be filled by a Representative designated by GSCP), and the Members
shall take all action necessary to promptly elect, if necessary, such successor
or replacement Representative to the Board as soon as possible after the date of
such vacancy.

          (b) In the event that any Representative would not continue to be
entitled to be nominated by the Investor Group that nominated or appointed such
Representative

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pursuant to Section 3.03, such Representative shall immediately resign from the
Board (and the Investor Group that nominated such Representative shall use its
best efforts to cause such Representative to so resign) or be subject to removal
by a vote of the holders of a majority of the voting power of the Class A Units
then outstanding and entitled to vote on such matters. In addition, each
Investor Group shall at all times have the exclusive right to recommend the
removal, with or without cause, of any Representative nominated or appointed by
such Investor Group (it being understood and agreed that, in the case of a
Representative nominated or appointed by (i) BCP IV, so long as BCP IV holds any
Class A Units, such right shall be exercisable by BCP IV, (ii) Apollo V, so long
as Apollo V holds any Class A Units, such right shall be exercisable by Apollo
V, or (iii) GSCP, so long as GSCP holds any Class A Units, such right shall be
exercisable by GSCP), and such Representative shall immediately resign (and the
Investor Group that nominated such Representative shall use its best efforts to
cause such Representative to resign) or if such Representative fails to resign
as requested, he or she will be subject to removal by a vote of the holders of a
majority of the total voting power of the Class A Units then outstanding and
entitled to vote on such matters. Prior to the occurrence of a Qualified IPO (as
hereinafter defined), if any Representative shall fail to resign as required by
either of the first two sentences of this Section 3.04(b), any Investor Group
continuing to have the right to nominate a Representative hereunder shall have
the right to call or to cause the Company to call a special meeting of holders
of Units (or to cause the Members to act by written consent) for the purpose of
removing such Representative; following the occurrence of a Qualified IPO, such
matter shall be considered at the next meeting (or action by written consent) of
holders of Units otherwise held (or acted upon). Each Member agrees to take all
required actions (including voting and acting by written consent) in furtherance
of the provisions of this Section 3.04.

     Section 3.05. Chairman. A chairman may be appointed by the Representatives
from among themselves or any other member of the Board. The Chairman, if
appointed, will preside over meetings of the Board and, if a Representative,
shall otherwise have no greater authority than any other Representative and, if
not a Representative, shall otherwise have no greater authority than any other
member of the Board.

     Section 3.06. Voting. Each Representative, including any Chairman who is
also a Representative, shall have a single vote, provided that any
Representative may, subject to Applicable Law, give any other Representative a
proxy to represent such first Representative in any matters. Any vote, consent
or other action of the Board may be undertaken with the unanimous written
consent (in lieu of meeting) of the Representatives, in each case who have been
designated and who are then in office.

     Section 3.07. Approval Rights. (a) From and after the Effective Date, until
the date on which any Investor Group beneficially owns an amount of Class A
Units which shall equal less than 33 1/3% (48.5% in the case of the GS Investor
Group) of such Investor Group's Initial Equity Stake (such date, the "First
Investor Sell Down Date"), the effectiveness of any vote, consent or other
action of the Board shall, in addition to any other vote which may be required
hereunder, require approval of all of the Representatives of at least two of the
Investor Groups (or, if applicable, of two members, each representing a
different Investor Group, of the Executive Committee), and to the extent any
vote, consent or other action is taken by the holders of Units or of the
Investor Groups, such vote, consent or other action shall, in addition to any
other vote required, require the approval of at least two of the Investor
Groups. From and after

                                                                               5

the First Investor Sell Down Date, until the date on which any two of the
Investor Groups beneficially own an amount of Class A Units which shall equal
less than 33 1/3% (48.5% in the case of the GS Investor Group) of each such
Investor Group's Initial Equity Stake (the "Second Investor Sell Down Date"),
the effectiveness of any vote, consent or other action of the Board shall, in
addition to any other vote which may be required hereunder, require approval of
all of the Representatives of the Investor Groups which are still entitled to
nominate two Representatives pursuant to Section 3.03 (or, if applicable, of two
members, each representing a different Investor Group, of the Executive
Committee), and to the extent any vote, consent, or other action is taken by the
holders of Units or of the Investor Groups, such vote, consent, or other action
shall, in addition to any other vote which may be required hereunder, require
the approval of the Investor Groups which are still entitled to nominate two
Representatives pursuant to Section 3.03. From and after the Second Investor
Sell Down Date, the provisions of this Section 3.07(a) shall cease to apply and
the vote of the majority of the directors present at a meeting at which a quorum
is present shall be the act of the Board, unless otherwise provided. Any action
that requires the approval of an Investor Group shall only be effective if
approved by Members beneficially holding a majority of Class A Units of such
Investor Group.

     (b) From and after the Effective Date until the earlier of the Second
Investor Sell Down Date and the occurrence of a Qualified IPO, the Company will
not, and will cause NIH, Nalco Holdings and any Major Subsidiary not to take any
of the following actions without the prior approval of the Board (or the
Executive Committee) in accordance with Section 3.07(a) and any other further
approval specified herein:

          1.   paying of any dividend or distribution to holders of Units;

          2.   entering into any joint venture or similar transaction with any
               Person;

          3.   incurring, assuming or refinancing any third-party indebtedness
               by the Company or any Subsidiary in excess of $10 million or
               issuing any debt securities to a third-party or entering any
               agreements concerning any third-party debt financing, except in
               connection with the initial financing of the acquisition of the
               Acquired Business;

          4.   approving of the Company's annual budget or taking any action or
               authorizing or making any expenditures, including capital
               expenditures, in excess of $10 million, except as previously
               authorized in accordance with this Agreement;

          5.   settling or compromising any pending or threatened suit, action
               or claim in excess of $1 million;

          6.   entering into any agreement or arrangement that materially limits
               or otherwise restricts the Company or any of its Subsidiaries or
               any successor thereto, from engaging or competing in any material
               line of business or in any material geographic area;

          7.   electing, appointing or removing any officer of the Company, NIH,
               Nalco Holdings, or of any Major Subsidiary;

          8.   entering into any agreement or arrangement with any Member or any
               affiliate thereof;

          9.   making any election to change the classification of the Company,
               NIH, Nalco Holdings or any Major Subsidiary for Federal income
               tax purposes;

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     (c) From and after the Effective Date until the earlier of the Second
Investor Sell Down Date and the occurrence of a Qualified IPO, the following
actions shall require the approval of the Investor Groups in accordance with
Section 3.07(a) and any other further approval specified herein:

          1.   amending, altering or repealing, whether by merger,
               consolidation, combination, reclassification or otherwise, the
               Certificate;

          2.   creation, authorization or issuance of any class, series or
               shares of stock or any other equity interests or Units in the
               Company, NIH, Nalco Holdings or any Major Subsidiary or any
               right, warrant or option to acquire or security convertible into,
               any such equity interest or Units in the Company, NIH, Nalco
               Holdings or any Major Subsidiary or the redemption, repurchase,
               or other acquisition of any of the foregoing;

          3.   amending or altering the rights of any Units or of the holders
               thereof;

          4.   the Company, NIH, Nalco Holdings, or any Major Subsidiary
               entering into any merger, consolidation, recapitalization,
               liquidation, or sale of such entity or all or substantially all
               of the assets of the Company, NIH, Nalco Holdings or any Major
               Subsidiary or consummation of a similar transaction involving the
               Company, NIH, Nalco Holdings or any Major Subsidiary (other than
               a merger, consolidation or similar transaction between or among
               the Company and one or more direct or indirect wholly-owned
               Subsidiaries of the Company which transaction would not adversely
               impact the rights of any holder of Units) or entering into any
               agreement providing therefor;

          5.   voluntarily initiating any liquidation, dissolution or winding up
               of the Company, NIH, Nalco Holdings, or any Major Subsidiary or
               permitting the commencement of a proceeding for bankruptcy,
               insolvency, receivership or similar action with respect to the
               Company or any of its Subsidiaries;

          6.   the Company, NIH, Nalco Holdings, or any Major Subsidiary
               acquiring or disposing of (for either cash or non-cash
               consideration) in a single transaction or a series of related
               transactions, any business or assets (including investments in
               third parties) with an aggregate value in such transaction or
               series of related transactions in excess of $50 million
               (including in such calculation, all assumed debt, all cash
               payments, and the fair market value of all securities or other
               property issued as consideration) or entering into any agreement
               providing therefor;

          7.   the Company, NIH, Nalco Holdings, or any Major Subsidiary
               commencing or entering into, or agreeing or otherwise committing
               to enter into, any business or operations other than those
               businesses and operations of the same or similar nature to those
               which are being conducted by the Acquired Business as of the
               Effective Date;

          8.   changing the corporate or organizational structure of the Company
               or any of its Subsidiaries, except as contemplated by this
               Agreement in connection with a Qualified IPO.

     Section 3.08. Meetings of the Board.

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     (a) Meetings. The Board shall meet at least annually, at such time and at
such place as the Board may designate. Special meetings of the Board shall be
held at the request of any Representative upon at least two (2) days (if the
meeting is to be held in person) or one (1) day (if the meeting is to be held
telephonically) written notice to all of the Representatives and Observers, if
any, or upon such shorter notice as may be approved by all of the
Representatives. Any Representative or Observer may waive the requirement of
such notice as to itself, before, at or after the meeting

     (b) Conduct of Meetings. Any meeting of the Board may be held in person or
telephonically.

     (c) Quorum. A majority of the Representatives who have been designated
pursuant to the provisions of this Agreement and who are then in office shall be
necessary to constitute a quorum of the Board for purposes of conducting
business, provided however that notwithstanding the preceding, the Board shall
not have the power to authorize, facilitate or permit any actions other than in
accordance with the terms of this Agreement, including Section 3.07(a). The
affirmative vote of a majority of the Representatives in attendance at any
meeting at which a quorum is present, and the approval required by Section
3.07(a), if then operative, shall be required to authorize any action.

     Section 3.09. Payments to Representatives; Reimbursements. No director who
is an Officer or otherwise employed by the Company shall be entitled to
remuneration from the Company for services rendered in his or her capacity as a
director (other than for reimbursement of reasonable out-of-pocket expenses of
such director in accordance with Company policy). All Representatives will be
entitled to reimbursement of their reasonable out-of-pocket expenses incurred in
connection with their attendance at Board meetings and such director fees as may
be authorized by the Board, provided, however, that should the Board authorize
the payment of any director fees, each Representative shall receive the same fee
as each of the other Representatives.

     Section 3.10. Board Committees. (a) The parties agree that until the
earlier of (a) the First Investor Sell Down Date or (b) the completion of a
Qualified IPO, any committee of the Board shall include in its membership at
least one Representative from each Investor Group and until the earlier of the
(y) Second Investor Sell Down Date or (z) the completion of a Qualified IPO, any
committee of the Board shall include in its membership at least one
Representative from each Investor Group still entitled to nominate two directors
pursuant to Section 3.03; provided, however, that for as long as required by
Applicable Law, the Board shall establish an Audit Committee in accordance with
such Applicable Law and to the maximum extent possible giving effect to this
Section 3.10.

     (b) The Board may establish an executive committee (the "Executive
Committee") in accordance with Section 3.10(a), which shall have the authority
to exercise, subject to Applicable Law, all the powers of the Board in the
management of the business and affairs of the Company granted by this Agreement
and shall initially consist of four members. The Board may increase the size of
the Executive Committee, but in no event shall it have fewer than three members.
The initial members of the Executive Committee shall be Chinh Chu, Joshua
Harris, Sanjeev Mehra and William H. Joyce.

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     Section 3.11. Major Subsidiaries. The Company and the Members shall take
all action required to ensure that each of the Representatives are also members
of the Board of Directors (or similar governing body) of each Major Subsidiary.

     Section 3.12. Member Action. Except as otherwise provided herein, the
presence in person or by proxy of the holders of a majority of the outstanding
Units shall be necessary to constitute a quorum. Except as otherwise provided
herein, any vote, consent or other action of the Members shall be obtained and
any action shall be authorized if the affirmative vote of the holders of a
majority of the Units present at a meeting at which a quorum is present, and the
approval required by Section 3.07(a), if then operative, shall be obtained.

     Section 3.13. Officers. (a) Designation and Appointment. The Board may,
from time to time, employ and retain Persons as may be necessary or appropriate
for the conduct of the Company's business (subject to the supervision and
control of the Board), including employees, agents and other Persons (any of
whom may be a Member or Representative) who may be designated as Officers of the
Company, with titles including but not limited to "chief executive officer,"
"president," vice president," "treasurer," "secretary," "general counsel,"
"director" and "chief financial officer," as and to the extent authorized by the
Board. Any number of offices may be held by the same Person. In the Board's
discretion, the Board may choose not to fill any office for any period as it may
deem advisable. Officers need not be residents of the State of Delaware or
Members. Any Officers so designated shall have such authority and perform such
duties as the Board may, from time to time, delegate to them. The Board may
assign titles to particular Officers. Each Officer shall hold office until his
successor shall be duly designated and shall have qualified as an Officer or
until his death or until he shall resign or shall have been removed in the
manner hereinafter provided. The salaries or other compensation, if any, of the
Officers of the Company shall be fixed from time to time by the Board.

     (b) Resignation and Removal. Any Officer may resign as such at any time.
Such resignation shall be made in writing and shall take effect at the time
specified therein, or if no time be specified, at the time of its receipt by the
Board. The acceptance by the Board of a resignation of any Officer shall not be
necessary to make such resignation effective, unless otherwise specified in such
resignation. Any Officer may be removed as such, either with or without cause,
at any time by the Board. Designation of any Person as an Officer by the Board
shall not in and of itself vest in such Person any contractual or employment
rights with respect to the Company.

     (c) Duties of Officers Generally. The Officers, in the performance of their
duties as such, shall (i) owe to the Company and the Members duties of loyalty
and due care of the type owed by the officers of a corporation to such
corporation and its stockholders under the laws of the State of Delaware, (ii)
keep the Board reasonably apprised of material developments in the business of
the Company, and (iii) present to the Board, at least annually, a review of the
Company's performance, an operating budget for the Company, and a capital budget
for the Company.

     (d) Chief Executive Officer. Subject to the powers of the Board, the chief
executive officer of the Company shall be in general and active charge of the
entire business and affairs of the Company, and shall be its chief policy making
Officer.

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     (e) President. The president of the Company shall, subject to the powers of
the Board and the chief executive officer of the Company, have general and
active management of the business of the Company, and shall see that all orders
and resolutions of the Board are effectuated. The president of the Company shall
have such other powers and perform such other duties as may be prescribed by the
chief executive officer of the Company or by the Board.

     (f) Chief Financial Officer. The chief financial officer of the Company
shall keep and maintain, or cause to be kept and maintained, adequate and
correct books and records of accounts of the properties and business
transactions of the Company, including accounts of the Company's assets,
liabilities, receipts, disbursements, gains, losses, capital and Units. The
chief financial officer of the Company shall have custody of the funds and
securities of the Company, keep full and accurate accounts of receipts and
disbursements in books belonging to the Company, and deposit all moneys and
other valuable effects in the name and to the credit of the Company in such
depositories as may be designated by the Board. The chief financial officer of
the Company shall have such other powers and perform such other duties as may
from time to time be prescribed by the chief executive officer of the Company or
the Board.

     (g) Vice President(s). The vice president(s) of the Company shall perform
such duties and have such other powers as the chief executive officer of the
Company or the Board may from time to time prescribe. A vice president may be
designated as an Executive Vice President, a Senior Vice President, an Assistant
Vice President, or a vice president with a functional title.

     (h) Secretary. The secretary of the Company shall, if requested by the
Board, attend all meetings of the Board, record all the proceedings of the
meetings and perform similar duties for the committees of the Board when
required. The secretary of the Company shall keep all documents as may be
required under the Act. The secretary shall perform such other duties and have
such other authority as may be prescribed elsewhere in this Agreement or from
time to time by the chief executive officer of the Company or the Board. The
secretary of the Company shall have the general duties, powers and
responsibilities of a secretary of a Corporation. If the Board chooses to
appoint an assistant secretary or assistant secretaries, the assistant
secretaries, in the order of seniority, shall in the Company secretary's
absence, disability or inability to act, perform the duties and exercise the
powers of the secretary of the Company, and shall perform such other duties as
the chief executive officer of the Company or the Board may from time to time
prescribe.

     (i) Treasurer. The treasurer of the Company shall receive, keep, and
disburse all moneys belonging to or coming to the Company. The treasurer of the
Company shall prepare, or cause to be prepared, detailed reports and records of
all expenses, losses, gains, assets, and liabilities of the Company as directed
by the chief financial officer of the Company and shall perform such other
duties in connection with the administration of the financial affairs of the
Company as may from time to time be prescribed by the chief financial officer or
the chief executive officer of the Company or by the Board.

     Section 3.14. VCOC. In the event that the Company ceases to qualify as an
"operating company" (as defined in 29 C.F.R. ss. 2510.3-101(c)), then the
Company and each Member will cooperate in good faith to take all reasonable
action necessary to provide that the

                                                                              10

investment (or at least 51% of the investment valued at cost) of each Member
that qualifies as a "venture capital operating company" (as defined in 29 C.F.R.
ss. 2510.3-101(d)) (a "VCOC Member") shall continue to qualify as a "venture
capital investment" (as defined in 29 C.F.R. ss. 2510.3-101(d)).

                                   ARTICLE IV

                                    TRANSFERS

     Section 4.01. Transfer. Prior to the second anniversary of the date hereof,
no Member shall, directly or indirectly, sell, transfer, pledge or otherwise
dispose of any economic, voting or other rights in or to (collectively,
"Transfer") any Units except for: (A) Transfers to one or more Permitted
Transferees, (B) from and after a Qualified IPO, Transfers made in compliance
with the requirements of Rule 144 of the Securities Act; provided, that, with
respect to any Management Member, no Transfer may be made pursuant to this
clause (B) without the Company's prior written approval, (C) Transfers pursuant
to the Registration Rights Agreement, (D) pursuant to Article XI hereof or (E)
pursuant to Section 2.02 or 2.04 of the Management Members Agreement (each an
"Excepted Transfer"). No holder of Units shall grant any proxy or become party
to any voting trust or other agreement that is inconsistent with, conflicts with
or violates any provision of this Agreement. Notwithstanding anything to the
contrary contained herein, no Member shall Transfer any Units prior to a
Qualified IPO if such Transfer would cause (i) the Company to be taxed as a C
Corporation or (ii) the Company to be treated as a publicly-traded partnership
for purposes of Section 7704 of the Code.

     Section 4.02. Permitted Transfers. No Transfer of any Unit to a Permitted
Transferee shall be effective unless and until such Permitted Transferee agrees
to be bound by the terms and conditions of this Agreement, and any related
agreements previously approved by the Board or the Members in accordance with
this Agreement. Upon the effective Transfer of any Units to a Permitted
Transferee by a Sponsor Member, such Permitted Transferee shall be considered a
Sponsor Member and a member of the transferor's Investor Group for purposes of
this Agreement.

     Section 4.03. Void Transfers. Any Transfer or attempted Transfer of any
Units in violation of any provision of this Agreement or any other agreement
with the Company shall be null and void, and the Company shall not record such
Transfer on its books or, to the fullest extent permitted by law, treat any
purported Transferee of such Units as the owner thereof for any purpose.

     Section 4.04. Successors and Substitute Members. Upon the bankruptcy,
termination, liquidation or dissolution of a Member which is a partnership,
trust, corporation, limited liability company or other entity or the bankruptcy,
death or incapacity of a Member who is an individual, the estate or successor in
interest of such Member shall thereupon succeed only to the rights of such
Member to receive allocations and distributions hereunder (but not the other
rights hereunder) and may become a substitute Member only upon the approval of
the Board.

     Section 4.05. Legend. Each certificate (if certificated) evidencing Units
(as defined below) and each instrument issued in exchange for or upon the
Transfer of any Units shall

                                                                              11

be stamped or otherwise imprinted with a legend in substantially the following
form, or such similar legend as may be specified in any other agreement with the
Company:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT
          TO CERTAIN TRANSFER AND OTHER RESTRICTIONS SET FORTH IN THE
          LIMITED LIABILITY COMPANY OPERATING AGREEMENT, DATED AS OF
          MAY 17, 2004, AMONG NALCO LLC AND ITS MEMBERS AND ONE OR
          MORE OTHER AGREEMENTS AND, AMONG OTHER THINGS, MAY NOT BE
          OFFERED OR SOLD EXCEPT IN COMPLIANCE WITH SUCH TRANSFER
          RESTRICTIONS. COPIES OF SUCH AGREEMENTS ARE ON FILE WITH THE
          SECRETARY OF THE LIMITED LIABILITY COMPANY AND ARE AVAILABLE
          WITHOUT CHARGE UPON WRITTEN REQUEST THEREFOR. THE HOLDER OF
          THIS CERTIFICATE, BY ACCEPTANCE OF THIS CERTIFICATE, AGREES
          TO BE BOUND BY ALL OF THE PROVISIONS OF THE AFORESAID
          AGREEMENTS. "

     Section 4.06. Initial Public Offering. Immediately prior to the
consummation of a Qualified IPO authorized by the Board or required by the
Registration Rights Agreement, the Members and Board will take all necessary and
desirable actions in consummation of any such Qualified IPO, and, if approved by
the Board, effect a Solvent Reorganization of the Company into a corporation
and/or exchange of the Units into securities of the Company or its Subsidiaries
or distribution of securities of the Company or its Subsidiaries in respect of
Units (the "Reclassified Securities") the Board finds acceptable; provided, that
(i) the Reclassified Securities provide each Member with substantially similar,
economic interest, governance, priority and other rights and privileges as such
Member had prior to such recapitalization and/or exchange (prior to giving
effect to the effect of the Qualified IPO on the terms of this Agreement) and
are consistent with the rights and preferences attendant to such Units as set
forth in the Agreement or Applicable Law as in effect immediately prior to such
Qualified IPO and (ii) except as otherwise provided herein, the provisions of
this Agreement apply to the Reclassified Securities and the issuer thereof as
such provisions apply to the Units and the Company, mutatis mutandis.

                                   ARTICLE V

                               INFORMATION RIGHTS

     Section 5.01. Each of the Members shall be entitled to receive, and the
Company shall provide to any such Member by mail to the address specified in
Section 13.02, at the times specified below, the following reports:

     (a)  Annual Reports. within 120 days after the end of each Fiscal Year of
          the Company, a consolidated Balance Sheet as of the end of such Fiscal
          Year, a consolidated Statement of Income and a consolidated Statement
          of Cash Flows of the Company and its Subsidiaries for such year,
          setting forth in each case in comparative form the figures from the
          Company's previous Fiscal Year (if any), all prepared in accordance
          with generally

                                                                              12

          accepted accounting principles and practices and audited by nationally
          recognized independent certified public accountants; and

     (b)  Quarterly Reports. within forty-five (45) days after the end of each
          fiscal quarter of the Company (except the last quarter of the
          Company's Fiscal Year), quarterly unaudited financial statements,
          including an unaudited Balance Sheet, and an unaudited Statement of
          Income.

     The obligations of the Company to furnish financial information to the
Members pursuant to Sections 5.01 (a) and (b) shall terminate upon the earlier
to occur of (i) the completion of a Qualified IPO, or (ii) such time as the
Company otherwise becomes subject to the reporting requirements of the 1934 Act.

                                   ARTICLE VI

                                  DISTRIBUTIONS

     Section 6.01. In General. Any distributions of cash or other assets by the
Company to Members shall be made in accordance with this Article VI. Except to
the extent otherwise provided herein, any distributions required to be made pro
rata to holders of a class of Units shall be made based on their proportionate
ownership of the outstanding Units within the class. Available cash shall be
distributed, at such times and in such amounts as the Board determines in its
discretion. Notwithstanding any other provision hereof, the Company shall cause
its Subsidiaries to distribute or otherwise transfer to the Company, to the
fullest extent possible within the limits imposed by Applicable Law or
agreement, the cash or cash equivalents necessary for the Company to make the
distributions to be made hereunder.

     Section 6.02. Discretionary Distributions. (a) Subject to Sections 6.03,
7.02, 7.03 and 8.03, available cash shall be distributed, at such times and in
such amounts as the Board determines in its discretion, in the following order
and priority:

     1)   first, pro rata to the holders of Class A Units to the extent of the
          Class A Invested Capital;

     2)   second, pro rata to the holders of Vested and Unvested Units of each
          class (other than Class A Units) to the extent of the Other Invested
          Capital of such class;

     3)   third, pro rata to the holders of Class A Units, the holders of Vested
          Class B Units and the holders of Vested Class C Units until an amount
          equal to the Class A Preferential Return Value has been distributed to
          the holders of Class A Units (for the avoidance of doubt, such Class A
          Preferential Return Value to have been reduced by the amount
          distributed pursuant to Section 6.02(a)(1) and (2));

     4)   fourth, pro rata to the holders of Class A Units, the holders of
          Vested Class B Units, holders of Vested Class C Units and the holders
          of Vested Class D Units.

                                                                              13

     Section 6.03. Tax Distributions. The Company shall, subject to the
discretion of the Board, distribute to each Member an amount equal to the
excess, if any, of (A) the product of the applicable Assumed Tax Rate and the
Net Profit of the Company allocable to such Member under Sections 7.02 and 7.03
with respect to the applicable Fiscal Year, over (B) the amount of distributions
made to such Member under Section 6.02 with respect to such Fiscal Year. Any
distributions under this Section 6.03 shall be treated for all purposes of this
Agreement as having been distributed with respect to the Class A Units, Class B
Units, Class C Units or Class D Units, as the case may be.

     Section 6.04. Limitation on Distributions. Notwithstanding any provision in
this Agreement to the contrary, the Company, and the Board on behalf of the
Company, shall not make a distribution to any Member on account of its Units in
the Company if such distribution would violate the Act.

                                  ARTICLE VII

                        ALLOCATIONS AND CAPITAL ACCOUNTS

     Section 7.01. Capital Accounts. A Capital Account shall be established for
each Member on the books of the Company and shall be maintained as provided in
the definition of Capital Account.

     Section 7.02. Allocations of Net Profits and Net Loss. (a) For each Fiscal
Year or portion thereof, Net Profit and Net Loss shall be allocated among the
Members (after giving effect to the allocations contained in paragraphs (b) and
(c) below and Section 7.03) so as to reduce proportionately the differences
between their respective Partially Adjusted Capital Accounts (after giving
effect to the allocations contained in paragraphs (b), (c) and (d) below) and
Target Capital Accounts for such year. To the extent possible, each Member shall
be allocated a share of all Company items in proportion to such Member's
interest in such Company items.

     (b) If the Company has Net Profit for any Fiscal Year or has neither Net
Profit nor Net Loss for any Fiscal Year (in each case determined prior to giving
effect to this Section 7.02(b) but after giving effect to Section 7.03), each
Member whose Partially Adjusted Capital Account is greater than its Target
Capital Account shall be specially allocated items of Company expenses or loss
for such Fiscal Year equal to the difference between its Target Capital Account
and its Partially Adjusted Capital Account. If the Company has insufficient
items of expense or loss for such Fiscal Year to satisfy the previous sentence
with respect to all such Members, the available items of expense or loss shall
be divided among such Members in proportion to such differences.

     (c) If the Company has a Net Loss for any Fiscal Year (determined prior to
giving effect to this Section 7.02(c) but after giving effect to Section 7.03),
each Member whose Target Capital Account is greater than its Partially Adjusted
Capital Account for such Fiscal Year shall be specially allocated items of
Company income or gain for such Fiscal Year equal to the difference between its
Target Capital Account and its Partially Adjusted Capital Account. If the
Company has insufficient items of income or gain for such Fiscal Year to satisfy
the previous

                                                                              14

sentence with respect to all such Members, the available items of income or gain
shall be divided among such Members in proportion to such differences.

     Section 7.03. Miscellaneous and Regulatory Tax Allocations. Notwithstanding
anything to the contrary set forth in this Agreement, the following special
allocations, if applicable, shall be made in the following order:

     (a)  Company Minimum Gain Chargeback. Except as otherwise provided in
          Treasury Regulations Section 1.704-2(f), notwithstanding any other
          provision of this Article VII, if there is a net decrease in Company
          Minimum Gain during any Fiscal Year, each Member shall be specially
          allocated items of Company income and gain for such Fiscal Year (and,
          if necessary, subsequent Fiscal Years) in an amount equal to such
          Member's share of the net decrease in Company Minimum Gain, determined
          in accordance with Treasury Regulations Section 1.704-2(g).
          Allocations pursuant to the previous sentence shall be made in
          proportion to the respective amounts required to be allocated to each
          Member pursuant thereto. The items to be so allocated shall be
          determined in accordance with Treasury Regulations Sections
          1.704-2(f)(6) and 1.704-2(j)(2). This Section 7.03(a) is intended to
          comply with the minimum gain chargeback requirements set forth in
          Treasury Regulations Section 1.704-2(f) and shall be interpreted
          consistently therewith.

     (b)  Member Minimum Gain Chargeback. Except as otherwise provided in
          Treasury Regulations Section 1.704-2(i)(4), notwithstanding any other
          provision of this Article VII, if there is a net decrease in Member
          Minimum Gain attributable to a Member Nonrecourse Debt during any
          Fiscal Year, each Member who has a share of the Member Minimum Gain
          attributable to such Member Nonrecourse Debt, determined in accordance
          with Treasury Regulations Section 1.704-2(i)(5), shall be specially
          allocated items of Company income and gain for such Fiscal Year (and,
          if necessary, subsequent Fiscal Years) in an amount equal to the
          portion of such Member's share of the net decrease in Member Minimum
          Gain attributable to such Member Nonrecourse Debt, determined in
          accordance with Treasury Regulations Section 1.704-2(i)(4).
          Allocations pursuant to the previous sentence shall be made in
          proportion to the respective amounts required to be allocated to each
          Member pursuant thereto. The items to be so allocated shall be
          determined in accordance with Treasury Regulations Sections
          1.704-2(i)(4) and 1.704-2(j)(2). This Section 7.03(b) is intended to
          comply with Treasury Regulations Section 1.704-2(i)(4) and shall be
          interpreted consistently therewith.

     (c)  Qualified Income Offset. In the event any Member unexpectedly receives
          any adjustments, allocations or distributions described in
          subparagraphs (4), (5) or (6) of Treasury Regulations Section
          1.704-1(b)(2)(ii)(d), such Member shall be allocated items of Company
          income or gain in an amount and manner sufficient to eliminate such
          Member's Adjusted Capital Account Deficit as quickly as possible to
          the extent required by the Treasury Regulations; provided, that an
          allocation pursuant to this Section 7.03(c) shall be made only if and
          to the extent that such Member would have an Adjusted Capital Account
          Deficit after tentatively making all other allocations provided in
          this Article VII as if this Section 7.03(c) were not in this
          Agreement.

                                                                              15

     (d)  Adjustments Occasioned by Code Section 754 Election. To the extent an
          adjustment to the adjusted tax basis of any Company asset pursuant to
          Code Section 734(b) or Code Section 743(b) is required pursuant to an
          election under Code Section 754 to be taken into account in
          determining Capital Accounts as the result of a distribution to a
          Member in complete liquidation of its interest, the amount of such
          adjustment to Capital Accounts shall be treated as an item of gain (if
          the adjustment increases the basis of the asset) or loss (if the
          adjustment decreases such basis) and such gain or loss shall be
          specially allocated to the Members in accordance with their interests
          in the event Treasury Regulations Section 1.704-1(b)(2)(iv)(m)(2)
          applies, or to the Member to whom such distribution was made in the
          event Treasury Regulations Section 1.704-1(b)(2)(iv)(m)(4) applies.

     (e)  Treatment of Regulatory Allocations. The allocations set forth in this
          Section 7.03 (the "Regulatory Allocations") are intended to comply
          with and shall be interpreted consistently with certain requirements
          of Treasury Regulations Sections 1.704-1 and 1.704-2. Notwithstanding
          any other provisions of this Article VII (other than the Regulatory
          Allocations), the Regulatory Allocations shall be taken into account
          in allocating other Net Profits and Net Losses and items of income,
          gain, loss and deduction among Members so that, to the extent
          possible, the net amount of such allocations of other Net Profits and
          Net Losses and other items and the Regulatory Allocations to each
          Member shall be equal to the net amount that would have been allocated
          to such Member if the Regulatory Allocations had not occurred.

     Section 7.04. Loss Limitation. Net Loss allocated pursuant to Section 7.02
shall not exceed the maximum amount of Net Loss that can be allocated without
causing any Member to have an Excess Loss. For this purpose, "Excess Loss" means
any Net Loss the allocation of which to a Member would cause such Member to have
an Adjusted Capital Account Deficit (or increase the amount of such deficit) at
the end of any Fiscal Year. If some but not all Members would be allocated an
Excess Loss as a consequence of an allocation of Net Loss pursuant to Section
7.02, the foregoing limitation shall be applied on a Member by Member basis so
as to allocate the maximum permissible Net Loss to each Member under Treasury
Regulations Section 1.704-1(b)(2)(ii)(d). Prior to any allocation of Net Profit
under Section 7.02, after an Excess Loss has been allocated to one or more
Members, an equal amount of Net Profit shall be allocated to such Members in
proportion to and to the extent of the Excess Losses previously allocated to
them.

     Section 7.05. Allocations for Tax Purposes.

     (a) In accordance with Section 704(c) of the Code and the Treasury
Regulations thereunder, income, gain, loss, and deduction with respect to any
property contributed to the capital of the Company shall, solely for tax
purposes, be allocated among the Members so as to take account of any variation
between the adjusted basis of such property to the Company for Federal income
tax purposes and its initial Gross Asset Value using the traditional method
described in Treasury Regulations Section 1.704-3(b) (without curative or
remedial allocations).

     (b) In the event the Gross Asset Value of any Company asset is adjusted
pursuant to subparagraph (b) of the definition of Gross Asset Value, subsequent
allocations of income,

                                                                              16

gain, loss, and deduction with respect to such asset shall take account of any
variation between the adjusted basis of such asset for Federal income tax
purposes and its Gross Asset Value in the same manner as under Section 704(c) of
the Code and the Treasury Regulations thereunder.

     (c) Subject to the preceding paragraphs (a) and (b), for United States
Federal, state and local income tax purposes, each item of income, gains, losses
and deductions of the Company shall, for each taxable period, be allocated among
the Members in the same manner and in the same proportion that such items have
been allocated among the Members' respective Capital Accounts.

     Section 7.06. Distribution in Kind. If any property is distributed in kind
to the Members, it shall first be written up or down to its Fair Market Value as
of the date of such distribution, thus creating book gain or loss for the
Company, and the Fair Market Value of the property received by each Member as so
determined shall be debited against such Member's Capital Account at the time of
distribution.

                                  ARTICLE VIII

                           DISSOLUTION AND LIQUIDATION

     Section 8.01. Duration. The Company shall dissolve upon (i) the sale or
other disposition by the Company of all or substantially all of the assets,
properties or businesses the Company then owns, (ii) the dissolution of the
Company by action of the Board, or (iii) any other event that would cause the
dissolution of a limited liability company under the Act, unless the Company is
continued to the extent permitted by, and in accordance with, the Act (each of
the foregoing events, a "Dissolution Event").

     Section 8.02. Liquidation of Company. Upon dissolution of the Company, the
Board shall appoint a Person to serve as the "Liquidator" who shall act at the
direction of the Board, unless and until a successor Liquidator is appointed as
provided herein. The Liquidator shall agree not to resign at any time without 30
days' prior written notice. The Liquidator may be removed at any time, with or
without cause, by notice of removal and appointment of a successor Liquidator
approved by the Board. Within 30 days following the occurrence of any such
removal, a successor Liquidator may be elected by the Board. The successor
Liquidator shall succeed to all rights, powers and duties of the former
Liquidator. The right to appoint a successor or substitute Liquidator in the
manner provided herein shall be recurring and continuing for so long as the
functions and services of the Liquidator are authorized to continue under the
provisions hereof, and every reference herein to the Liquidator shall be deemed
to refer also to any such successor or substitute Liquidator appointed in the
manner herein provided. Except as expressly provided in this Article VIII, the
Liquidator appointed in the manner provided herein shall have and may exercise,
without further authorization or consent of any of the parties hereto, all of
the powers conferred upon the Board under the terms of this Agreement (but
subject to all of the applicable limitations, contractual and otherwise, upon
the exercise of such powers to the extent necessary or desirable in the good
faith judgment of the Liquidator to carry out the duties and functions of the
Liquidator hereunder for and during such period of time as shall be reasonably
required in the good faith judgment of the Liquidator to complete the winding up
and liquidation of the Company as provided for herein). The Liquidator shall
receive as compensation for

                                                                              17

its services (i) no additional compensation, if the Liquidator is an employee of
the Company or any of its Subsidiaries, or (ii) if the Liquidator is not such an
employee, a reasonable fee plus out-of-pocket costs and expenses or such other
compensation as the Board may otherwise approve.

     Section 8.03. Priority on Liquidation. (a) The Liquidator shall liquidate
the assets of the Company, and apply and distribute the proceeds of such
liquidation, in the following order of priority, unless otherwise required by
mandatory provisions of Applicable Law:

     (i) First, to the satisfaction (whether by payment or the making of
     reasonable provision for payment) of the Company's debts and obligations to
     its creditors, including sales commissions and other expenses incident to
     any sale of the assets of the Company and including the establishment of
     and additions to such reserves as the Liquidator may deem necessary or
     appropriate;

     (ii) Second, to the holders of Units, in accordance with their Capital
     Accounts as determined after taking into account all adjustments to Capital
     Accounts for the taxable year during which the liquidation occurs.

     (b) The reserves established pursuant to subparagraph (a) of this Section
8.03 shall be paid over by the Liquidator to a bank or other financial
institution, to be held in escrow for the purpose of paying any such contingent
or unforeseen liabilities or obligations and, at the expiration of such period
as the Liquidator deems advisable, such reserves shall be distributed to the
Members in the priorities set forth in Section 8.03(a)(ii). The allocations and
distributions provided for in this Agreement are intended to result in the
Capital Account of each holder of Units immediately prior to the distribution of
the Company's assets pursuant to Section 8.03(a) being equal to the amount that
would be distributable to such holder of Units pursuant to Section 6.02. The
Company is authorized to make appropriate adjustments to the allocations of
items of income, gain, loss and deduction as necessary to cause the Capital
Account of each holder of Units immediately prior to the distribution of Company
assets pursuant to Section 8.03(a) to equal the amount that would be
distributable to such holder of Units pursuant to Section 6.02.

     (c) Notwithstanding the provisions of Section 8.03(a) which require the
liquidation of the assets of the Company, but subject to the order of priorities
set forth in Section 8.03(a), if upon dissolution of the Company the Board
determines that an immediate sale of part or all of the Company's assets would
be impractical or could cause undue harm to the Members, then the Board may, in
its discretion, defer the liquidation of any assets except those necessary to
satisfy Company liabilities and reserves, and may, in its discretion, distribute
to the Members, in lieu of cash, as tenants in common and in accordance with the
provisions of Section 8.03(a)(ii), undivided interests in such Company assets as
the Liquidator deems reasonable and equitable and subject to any agreements
governing the operating of such properties at such time. For purposes of any
such distribution, the Board will determine the fair market value of any
property to be distributed.

     (d) A reasonable time will be allowed for the orderly winding up of the
business and affairs of the Company and the liquidation of its assets pursuant
to Section 8.03(a) in order to minimize any losses otherwise attendant upon such
winding up. Distributions upon liquidation

                                                                              18

of the Company (or any Member's interest in the Company) and related adjustments
will be made by the end of the Fiscal Year of the liquidation (or, if later,
within 90 days after the date of such liquidation) or as otherwise permitted by
Treasury Regulation Section 1.704-1(b)(2)(ii)(b).

     (e) The Company shall terminate when all of the assets of the Company have
been distributed in accordance with this Section 8.03 and the Certificate has
been canceled in the manner required by the Act.

                                   ARTICLE IX

                                BOOKS AND RECORDS

     Section 9.01. Books. The Company shall maintain complete and accurate books
of account of the Company's affairs at the Company's principal office, which
books shall be open to inspection by any Member (or its authorized
representative) to the extent required by the Act (unless provided otherwise in
this Agreement).

     Section 9.02. Tax Reports and Elections. (a) Not later than seventy-five
calendar days after the end of each Fiscal Year, the Board shall cause the
Company to furnish each Member an Internal Revenue Service Form K-1 and any
similar form required for the filing of state or local income tax returns for
such Member for such Fiscal Year. Upon the written request of any such Member
and at the expense of such Member, the Company will use reasonable efforts to
deliver or cause to be delivered any additional information necessary for the
preparation of any state, local and foreign income tax return that must be filed
by such Member.

     (b) The Board shall determine, subject to Section 3.07(a), whether to make
or revoke any available election pursuant to the Code. Each Member will, upon
request, supply the information necessary to give proper effect to any such
election. In connection with any Transfer of Units by a Management Member, such
Management Member shall provide to the Company such tax filings as the Company
reasonably requests (including Forms 4669).

     (c) To the extent applicable, the Company hereby designates BCP IV to act
as the "Tax Matters Partner" (as defined in Section 6231(a)(7) of the Code) in
accordance with Sections 6221 through 6233 of the Code. The Tax Matters Partner
is authorized and required to represent the Company (at the Company's expense)
in connection with all examinations of the Company's affairs by tax authorities,
including resulting administrative and judicial proceedings, and to expend
Company funds for professional services and costs associated therewith;
provided, that the Tax Matters Partner may be removed and replaced by, and shall
act in such capacity at the direction of, the Board. Each Member agrees to
cooperate with the Tax Matters Partner and to do or refrain from doing any or
all things reasonably requested by the Tax Matters Partner with respect to the
conduct of such proceedings. Subject to the foregoing proviso, the Tax Matters
Partner will have reasonable discretion to determine whether the Company (either
on its own behalf or on behalf of the Member) will contest or continue to
contest any tax deficiencies assessed or proposed to be assessed by any taxing
authority. Any deficiency for taxes imposed on any Member (including penalties,
additions to tax or interest imposed with respect to such taxes) will be paid by
such Member, and if paid by the Company, will be recoverable from such Member
(including by offset against distributions otherwise payable to such Member).
The Tax

                                                                              19

Matters Partner shall take reasonable action to cause each Investor Group to be
treated as a "notice partner" within the meaning of Section 6231(a)(8) of the
Code. Each such Investor Group shall have the right to participate in any
administrative proceeding and any discussions with the Internal Revenue Service.

     (d) Except as otherwise required (i) by Applicable Law or (ii) as a result
of an election by the Company to be classified as a corporation for Federal
income tax purposes, which election was approved by the Board in accordance with
Section 3.07(a), each of the Members and the Company shall take no action
inconsistent with, and shall make or cause to be made all applicable elections
with respect to (A) the treatment of the Company as a partnership for Federal
income tax purposes and (B) the treatment of the Company as not a publicly
traded partnership for Federal income tax purposes.

                                   ARTICLE X

            EXCULPATION AND INDEMNIFICATION; COMPETITIVE OPPORTUNITY

     Section 10.01. Exculpation and Indemnification. No Member, Representative,
Observer, member of the Board, Officer, or any direct or indirect officer,
director, stockholder or partner of a Member (each, an "Indemnitee"), shall be
liable, responsible or accountable in damages or otherwise to the Company, any
Member, or to any Member or Investor Group, for any act or failure to act by
such Indemnitee in connection with the conduct of the business of the Company,
or by any other such Indemnitee in performing or participating in the
performance of the obligations of the Company, so long as such Indemnitee acted
in the good faith belief that such action or failure to act was in the best
interests, or not opposed to the best interests, of the Company and/or its
Subsidiaries and such action or failure to act was not in violation of this
Agreement and did not constitute gross negligence or willful misconduct. Except
as otherwise required by the Act, no Person who is a Member, Representative, an
Officer, or any combination of the foregoing, shall be personally liable under
any judgment of a court, or in any other manner, for any debt, obligation, or
liability of the Company, whether that liability or obligation arises in
contract, tort, or otherwise, solely by reason of being a Member,
Representative, Observer, member of the Board, Officer or any combination of the
foregoing.

     (b) The Company shall indemnify and hold harmless each Indemnitee to the
fullest extent permitted by law against losses, damages, liabilities, costs or
expenses (including reasonable attorneys' fees and expenses and amounts paid in
settlement) incurred by any such Indemnitee in connection with any action, suit
or proceeding to which such Indemnitee may be made a party or otherwise involved
or with which it shall be threatened by reason of its being a Member,
Representative, Observer, member of the Board, Officer, or any direct or
indirect officer, director, stockholder or partner of a Member, or while acting
as (or on behalf of) a Member on behalf of the Company or in the Company's
interest. Such attorneys' fees and expenses shall be paid by the Company as they
are incurred upon receipt, in each case, of an undertaking by or on behalf of
the Indemnitee to repay such amounts if it is ultimately determined that such
Indemnitee is not entitled to indemnification with respect thereto.

                                                                              20

     (c) The right of an Indemnitee to indemnification hereunder shall not be
exclusive of any other right or remedy that a Member, Representative, Observer,
member of the Board or Officer may have pursuant to Applicable Law or this
Agreement.

     (d) An Indemnitee shall be fully protected in relying in good faith upon
the records of the Company and upon such information, opinions, reports or
statements presented to the Company by any Person as to matters the Indemnitee
reasonably believes are within such other Person's professional or expert
competence and who has been selected with reasonable care by or on behalf of the
Company, including information, opinions, reports or statements as to the value
and amount of the assets, liabilities, or any other facts pertinent to the
existence and amount of assets from which distributions to the Member might
properly be paid.

     (e) To the extent that, at law or in equity, an Indemnitee has duties
(including fiduciary duties) and liabilities relating thereto to the Company or
to any other Indemnitee, an Indemnitee acting under this Agreement shall not be
liable to the Company or to any other Indemnitee for its good faith reliance on
the provisions of this Agreement or any approval or authorization granted by the
Company or any other Indemnitee. The provisions of this Agreement, to the extent
that they restrict the duties and liabilities of an Indemnitee otherwise
existing at law or in equity, are agreed by the Members to replace such other
duties and liabilities of such Indemnitee.

     (f) The foregoing provisions of this Section 10.01 shall survive any
termination of this Agreement.

     Section 10.02. Insurance. The Company shall have the power to purchase and
maintain insurance on behalf of any Indemnitee or any Person who is or was an
agent of the Company against any liability asserted against such Person and
incurred by such Person in any such capacity, or arising out of such Person's
status as an agent, whether or not the Company would have the power to indemnify
such Person against such liability under the provisions of Section 10.01 or
under Applicable Law.

     Section 10.03. Competitive Opportunity. If any Representative acquires
knowledge of a potential transaction or matter which may be an investment or
business opportunity or prospective economic or competitive advantage in which
the Company could have an interest or expectancy (a "Competitive Opportunity")
or otherwise is then exploiting any Competitive Opportunity, the Company will
have no interest in, and no expectation that, such Competitive Opportunity be
offered to it, any such interest or expectation being hereby renounced so that
each Representative shall (i) have no duty to communicate or present such
Competitive Opportunity to the Company and (ii) have the right to hold any such
Competitive Opportunity for such Representative's (and its agents', partners' or
affiliates') own account and benefit; or to recommend, assign or otherwise
transfer or deal in such Competitive Opportunity to Persons other than the
Company or any affiliate of the Company. For the avoidance of doubt, this
Section 10.3 shall not operate to limit the duties or obligations of any of the
Management Members.

                                                                              21

                                   ARTICLE XI

                     DRAG-ALONG SALE; SALE OF THE BUSINESS.

     Section 11.01. Approval. At any time prior to the First Investor Sell Down
Date, any two Investor Groups may approve a Drag-Along Sale, and at any time
after the First Investor Sell Down Date and prior to the Second Investor Sell
Down Date, the Investor Groups that have the right to nominate two
Representatives may approve a Drag-Along Sale. A "Drag-Along Sale" shall mean
any merger of, consolidation of, or sale of Units (or any class of Units) of the
Company, through any transaction or group of related transactions, in which none
of the Sponsor Members approving the applicable transaction retain any Units.

     Section 11.02. Notice. Written notice of the Drag-Along Sale (the
"Drag-Along Sale Notice") shall be provided by the Company to all holders of
Units. Such Drag-Along Sale Notice shall disclose in reasonable detail the
number and class of Units to be subject to the Drag-Along Sale (the "Drag-Along
Securities"), the proposed price, the other proposed terms and conditions of the
proposed Drag-Along Sale (including copies of the definitive agreements relating
thereto) and the identity of the prospective purchaser.

     Section 11.03. Price. In the event that a Drag-Along Sale is proposed to be
made in which the acquiror (the "Purchaser") is a holder of Units of the Company
or an Affiliate of any such holder, then

          (i) if any Units have been purchased by the Purchaser within six
     months prior to the date of the Drag-Along Sale Notice, the aggregate price
     to be paid in respect of Units in connection with such Drag-Along Sale
     shall be equal to or greater than the highest price paid by such Purchaser
     or Affiliates for Units in the six months prior to the date of the
     Drag-Along Sale Notice, and

          (ii) the Company shall obtain a fairness opinion with regard to
     consideration to be received by holders of Units participating in the
     Drag-Along Sale from an independent investment banking firm, or other
     appraiser or valuation expert appointed by the Board.

     Section 11.04. Cooperation from the Holders of Units. With respect to any
Drag-Along Sale, each Member agrees that it shall use reasonable best efforts to
effect the Drag-Along Sale as expeditiously as practicable, including delivering
all documents necessary or reasonably requested in connection with such
Drag-Along Sale and entering into any instrument, undertaking or obligation
necessary or reasonably requested in connection with such Drag-Along Sale (as
specified in the Drag-Along Sale Notice). Subject to the terms and conditions of
this Article XI and without limiting the generality of the foregoing, the
Company and each party to this Agreement shall take or cause to be taken all
actions, and do, or cause to be done, on behalf and in respect of the Company
any and all actions that may be reasonably requested consistent with this
Article XI in connection with any Drag-Along Sale. In addition, each holder of
Drag-Along Securities, in the case of a Drag-Along Sale, shall (i) pay its pro
rata share (based on the aggregate proceeds) of the reasonable expenses (if any)
incurred by the Members in connection with such Drag-Along Sale (provided that
such expenses may be borne or reimbursed by the Company or

                                                                              22

borne by the Transferee and deducted from the consideration being paid by the
Purchaser, in either case to the extent permitted by law) and (ii) join on a pro
rata basis (based on the aggregate proceeds), severally and not jointly, in any
indemnification or other obligations that are specified in the Drag-Along Sale
Notice (other than any such obligations which relate specifically to a
particular holder such as indemnification with respect to representations and
warranties given by a holder regarding such holder's title to and ownership of
Units; provided that no holder shall be obligated under this clause in
connection with such Transfer to agree to indemnify or hold harmless the
Transferee or Transferees with respect to an amount in excess of the proceeds
paid in respect of such holder's Units in connection with such Transfer).

     Section 11.05. Consideration. In the event of a Drag-Along Sale, each
Member shall be required to Transfer such Units held by such holder as provided
in the Drag-Along Sale Notice. The form and value of the consideration offered
in respect of any security in a Drag-Along Sale shall be the same for all Units
subject to such Drag-Along Sale as set forth in the Drag-Along Sale Notice.

     Section 11.06. Other Units. Notwithstanding anything to the contrary
herein, the Company shall have the option on a Drag-Along Sale to purchase, and
each Member shall be required to sell any Class B Units, Class C Units and Class
D Units held by such member to the Company. In the event of any such sale, the
purchase price for any Vested Units will be the fair market value based upon the
price offered for Class A Units pursuant to the Drag-Along Sale and the purchase
price for any Unvested Units will be the lower of fair market value or the
amount paid for such Units. The Company may assign this repurchase right to a
Purchaser.

                                  ARTICLE XII

                                   DEFINITIONS

     Section 12.01. "Act" shall mean the Delaware Limited Liability Company Act,
Delaware Code, Title 6, Sections 18-101, et seq., as in effect from time to
time.

     Section 12.02. "Adjusted Capital Account Deficit" means, with respect to
each Member, the deficit balance, if any, in such Member's Capital Account as of
the end of the relevant Fiscal Year, after giving effect to the following
adjustments:

          (a) Credit to such Capital Account any amount which such Member is
     obligated to restore or is deemed obligated to restore pursuant to Treasury
     Regulations Section 1.704-2(g)(1) and (without duplication) 1.704-2(i)(5);
     and

          (b) Debit to such Capital Account the items described in Treasury
     Regulations Sections 1.704-1(b)(2)(ii)(d)(4), (5) and (6).

The foregoing definition of Adjusted Capital Account Deficit is intended to
comply with the provisions of Treasury Regulations Section 1.704-1(b)(2)(ii)(d)
and shall be interpreted consistently therewith.

                                                                              23

     Section 12.03. "Affiliate" shall have the meaning ascribed thereto in Rule
12b-2 promulgated under the 1934 Act, as in effect on the date hereof.

     Section 12.04. "Apollo V" shall mean Apollo Investment Fund V, L.P.

     Section 12.05. "Apollo Investor Group" shall mean APV Nalco LLC, AP Nalco
LP, Apollo V, Apollo/Nalco Acquisition LLC and their respective Permitted
Transferees.

     Section 12.06. "Applicable Law" means, with respect to any Person, any
statute, law, regulation, ordinance, rule, injunction, order, decree,
governmental approval, directive, requirement, or other governmental restriction
or any similar form of decision of, or determination by, or any interpretation
or administration of any of the foregoing by, any governmental authority,
applicable to such Person or its Subsidiaries or their respective assets.

     Section 12.07. "Assumed Tax Rate" means the highest effective marginal
statutory combined U.S. federal, state and local income tax rate prescribed for
an individual residing in New York City (taking into account (i) the
deductibility of state and local income taxes for U.S. federal income tax
purposes, assuming the limitation of Section 68(a)(2) of the Code applies and
taking into account any impact of Section 68(f) of the Code, and (ii) the
character (long-term or short-term capital gain, dividend income or other
ordinary income) of the applicable income).

     Section 12.08. "BCP IV" shall mean Blackstone Capital Partners IV L.P.

     Section 12.09. "BCP Investor Group" shall mean BCP Nalco I LLC, BCP Nalco
II LLC, BCP IV, Blackstone Family Investment Partnership IV-A L.P., Blackstone
Capital Partners IV-A L.P. and their respective Permitted Transferees.

     Section 12.10. "C Corporation" means a corporation subject to taxation
under Section 11 of the Code.

     Section 12.11. "Capital Account" means, for each Member, the Capital
Account established for each Member pursuant to Article VII as maintained for
each Member as follows:

          (a) To each Member's Capital Account there shall be credited (i) such
     Member's Capital Contributions, if any, when and as received and (ii) the
     Net Profit and other items of Company income and gain allocated to such
     Member pursuant to Section 7.02 or Section 7.03;

          (b) To each Member's Capital Account there shall be debited (i) the
     aggregate amount of cash distributed to such Member, (ii) the Net Loss and
     other items of Company loss and deduction allocated to such Member pursuant
     to Section 7.02 or Section 7.03, and (c) the Gross Asset Value of any
     Company assets (other than cash) distributed to such Member in kind (net of
     any liabilities secured by such distributed property that the Member is
     considered to assume or "take subject to" under Section 752 of the Code;

          (c) Capital Accounts shall be otherwise adjusted in accordance with
     Treasury Regulations Section 1.704-1(b); and

                                                                              24

          (d) If Units are Transferred in accordance with the terms of this
     Agreement, the Transferee shall succeed to the Capital Account of the
     Transferor to the extent it relates to the transferred Units.

The foregoing provisions and the other provisions of this Agreement relating to
the maintenance of Capital Accounts are intended to comply with Treasury
Regulations Section 1.704-1(b), and shall be interpreted and applied in a manner
consistent with such Treasury Regulations.

     Section 12.12. "Capital Contribution" means for each Member the total
amount of cash and the Gross Asset Value of property contributed to the Company
by such Member pursuant to Section 2.01 or otherwise, net of any liabilities
associated with such contributed property that the Company is considered to
assume or "take subject to" under Section 752 of the Code, which Capital
Contribution shall be reflected on Schedule A hereto as amended from time to
time in accordance with the terms of this Agreement.

     Section 12.13. "Class A Invested Capital" means, at any time, the aggregate
amount of Capital Contributions made in respect of all Class A Units.

     Section 12.14. "Class A Preferential Return Value" means, as of any time
the aggregate dollar amount that would be necessary to be distributed to the
holders of Class A Units so that the value of all distributions made by the
Company with respect to the Class A Units as of such time, equals the accreted
value of the Class A Invested Capital (determined as of such time by using a
rate of return of 30%, compounded annually from October 28, 2003).

     Section 12.15. "Class A Unit" means an interest in the Company designated
as a Class A Unit.

     Section 12.16. "Class B Unit" means an interest in the Company designated
as a Class B Unit.

     Section 12.17. "Class C Unit" means an interest in the Company designated
as a Class C Unit.

     Section 12.18. "Class D Unit" means an interest in the Company designated
as a Class D Unit.

     Section 12.19. "Code" means the Internal Revenue Code of 1986, as amended
from time to time.

     Section 12.20. "Company Minimum Gain" has the same meaning as "partnership
minimum gain" in Treasury Regulations Section 1.704-2(b)(2) and 1.704-2(d). A
Member's share of Company Minimum Gain shall be computed in accordance with the
provisions of Treasury Regulations Section 1.704-2(g).

     Section 12.21. "Depreciation" means, for each Fiscal Year, an amount equal
to the depreciation, amortization, or other cost recovery deduction allowable
with respect to an asset for such Fiscal Year, except that if the Gross Asset
Value of an asset differs from its adjusted basis for federal income tax
purposes at the beginning of such Fiscal Year, Depreciation shall be

                                                                              25

an amount which bears the same ratio to such beginning Gross Asset Value as the
federal income tax depreciation, amortization, or other cost recovery deduction
for such Fiscal Year bears to such beginning adjusted tax basis; provided, that
if the adjusted basis for federal income tax purposes of an asset at the
beginning of such Fiscal Year is zero and the Gross Asset Value of the asset is
positive, Depreciation shall be determined with reference to such beginning
Gross Asset Value using any permitted method selected by the Board.

     Section 12.22. "Fair Market Value" means, as of any date, the fair market
value on such date as determined by the Board.

     Section 12.23. "Family Group," with respect to any natural person, means
such natural person's spouse and descendants (whether natural or adopted) and
any trust solely for the benefit of such natural person and/or such natural
person's spouse and/or descendants.

     Section 12.24. "Fiscal Year" means (i) the taxable year of the Company,
which shall be the calendar year unless otherwise required (or, in the Board's
reasonable discretion, permitted) by Section 706(b) of the Code, and (ii) for
purposes of Article VII, the portion of any Fiscal Year for which the Company is
required to (or does) allocate gross income, Net Profit, Net Loss, or other
items pursuant to Article VII.

     Section 12.25. "Gross Asset Value" means, with respect to any Company
asset, the adjusted basis of such asset for Federal income tax purposes, except
as follows:

          (a) The initial Gross Asset Value of any Company asset contributed by
     a Member to the Company shall be the gross Fair Market Value of such
     Company asset as of the date of such contribution;

          (b) The Gross Asset Value of each Company asset shall be adjusted to
     equal its respective gross Fair Market Value, as of the following times:
     (i) the acquisition of an additional Unit in the Company by any new or
     existing Member in exchange for more than a de minimis Capital
     Contribution; (ii) the distribution by the Company to a Member of more than
     a de minimis amount of Company assets (other than cash) as consideration
     for all or part of its Units unless the Board reasonably determines that
     such adjustment is not necessary to reflect the relative economic interests
     of the Members in the Company; and (iii) the liquidation of the Company
     within the meaning of Treasury Regulations Section 1.704-1(b)(2)(ii)(g);

          (c) The Gross Asset Value of a Company asset distributed to any Member
     shall be the Fair Market Value of such Company asset as of the date of
     distribution thereof;

          (d) The Gross Asset Value of each Company asset shall be increased or
     decreased, as the case may be, to reflect any adjustments to the adjusted
     basis of such Company asset pursuant to Section 734(b) or Section 743(b) of
     the Code, but only to the extent that such adjustments are taken into
     account in determining Capital Account balances pursuant to Treasury
     Regulations Section 1.704-1(b)(2)(iv)(m); provided, that Gross Asset Values
     shall not be adjusted pursuant to this subparagraph (d) to the extent that
     an adjustment pursuant to subparagraph (b) above is made in conjunction
     with a

                                                                              26

     transaction that would otherwise result in an adjustment pursuant to this
     subparagraph (d);

          (e) The Board may cause the Gross Asset Value of the Company assets to
     be adjusted to the extent permitted by Treasury Regulations Section
     1.704-1(b)(2)(iv)(q) to reflect their Fair Market Value at such time; and

          (f) If the Gross Asset Value of a Company asset has been determined or
     adjusted pursuant to subparagraphs (a), (b), (d) or (e) above, such Gross
     Asset Value shall thereafter be adjusted to reflect the Depreciation taken
     into account with respect to such Company asset for purposes of computing
     Net Profits and Net Losses.

     Section 12.26. "GSCP" shall mean GS Capital Partners 2000, L.P.

     Section 12.27. "GS Investor Group" shall mean GS Nalco LLC, GSCP, GS
Capital Partners 2000 Offshore L.P., GS Capital Partners 2000 GmbH & Co.
Beteiligungs KG, GS Capital Partners 2000 Employee Fund, L.P., Goldman Sachs
Direct Investment Fund 2000, L.P. and their respective Permitted Transferees.

     Section 12.28. "Initial Equity Stake" shall mean, with respect to a Sponsor
Member, the Units owned by such Sponsor Member as of the Effective Date together
with any Units which shall have been issued directly or indirectly with respect
to or in exchange or substitution for or conversion of such Units by way of
dividend or distribution, recapitalization, merger, consolidation, exchange or
other reorganization, including securities of any other entity or entities
created through any Solvent Reorganization.

     Section 12.29. "Investor Group" shall mean any of the Apollo Investor
Group, the BCP Investor Group or the GS Investor Group.

     Section 12.30. "Investor Members" shall mean those Members identified as
Investor Members on Exhibit A.

     Section 12.31. "1934 Act" shall mean the Securities Exchange Act of 1934,
as amended, and the rules and regulations promulgated thereunder.

     Section 12.32. "Major Subsidiary" means any Subsidiary of the Company that
(1) contributed more than 35% of the consolidated revenues of the Company, (2)
contributed more than 35% of the consolidated income from operations, net of all
non-cash items, of the Company or (3) held more than 35% of the consolidated
assets of the Company for or at the end of the most recently completed Fiscal
Year, in each case as reflected on the audited consolidated financial statements
of the Company and its Subsidiaries as of the end of or for such Fiscal Year and
available at the time such determination is made.

     Section 12.33. "Management Members" shall mean those Members identified as
Management Members on Exhibit A.

     Section 12.34. "Management Members Agreement" shall mean those certain
agreements between the Company and the Management Members dated as of the
Effective Date.

                                                                              27

     Section 12.35. "Member" means each Person that (a) is an initial signatory
to this Agreement, including each Sponsor Member, each Investor Member and each
Management Member, or has been admitted to the Company as a Member of the
Company in accordance with the provisions of this Agreement, and (b) has not
ceased to be a Member of the Company in accordance with the provisions of this
Agreement or for any other reason. No Person that is not a Member shall be
deemed a "member" under the Act.

      Section 12.36. "Member Minimum Gain" means an amount, with respect to each
Member Nonrecourse Debt, equal to the Company Minimum Gain that would result if
such Member Nonrecourse Debt were treated as a Nonrecourse Liability, determined
in accordance with Treasury Regulations Section 1.704-2(i)(3).

     Section 12.37. "Member Nonrecourse Debt" has the same meaning as the term
"partner nonrecourse debt" in Treasury Regulations Section 1.704-2(b)(4).

     Section 12.38. "Member Nonrecourse Deductions" has the same meaning as the
term "partner nonrecourse deductions" in Treasury Regulations Section
1.704-2(i)(1) and 1.704-2(i)(2).

     Section 12.39. "Membership Interests" shall mean (i) a Member's entire
equity interests in the Company, including such Member's economic interest, the
right to vote on or participate in the Company's management, and the right to
receive information concerning the business and affairs of the Company, in each
case, to the extent expressly provided in this Agreement or required by the Act
and (ii) any equity interest in any other entity or entities created through any
Solvent Reorganization.

     Section 12.40. "Net Profit and Net Loss" means, for each Fiscal Year, an
amount equal to the Company's taxable income or loss for such Fiscal Year,
determined in accordance with Code Section 703(a) (including for this purpose,
all items of income, gain, loss or deduction required to be separately stated
pursuant to Code Section 703(a)(1)), with the following adjustments:

          (a) Any income of the Company that is exempt from Federal income tax
     and not otherwise taken into account in computing Net Profit or Net Loss
     pursuant to this definition shall be added to such taxable income or loss;

          (b) Any expenditures of the Company described in Section 705(a)(2)(B)
     of the Code or treated as Section 705(a)(2)(B) of the Code expenditures
     pursuant to Treasury Regulations Section 1.704-1(b)(2)(iv)(i) (other than
     expenses in respect of which an election is properly made under Section 709
     of the Code), and not otherwise taken into account in computing Net Profit
     or Net Loss pursuant to this definition shall be subtracted from such
     taxable income or loss;

          (c) In the event the Gross Asset Value of any Company asset is
     adjusted pursuant to subparagraph (b), (c) or (e) of the definition of
     Gross Asset Value, the amount of such adjustment shall be taken into
     account as gain (if the adjustment increases the Gross Asset Value of an

                                                                              28

     asset) or loss (if the adjustment decreases the Gross Asset Value of an
     asset) from the disposition of such Company asset for purposes of computing
     Net Profit or Net Loss;

          (d) Gain or loss resulting from any disposition of any Company asset
     with respect to which gain or loss is recognized for Federal income tax
     purposes shall be computed by reference to the Gross Asset Value of the
     Company asset disposed of, notwithstanding that the adjusted tax basis of
     such Company asset may differ from its Gross Asset Value;

          (e) In lieu of the depreciation, amortization, and other cost recovery
     deductions taken into account in computing such taxable income or loss,
     there shall be taken into account Depreciation for such Fiscal Year,
     computed in accordance with the definition of Depreciation;

          (f) To the extent an adjustment to the adjusted tax basis of any
     Company asset pursuant to Code Section 734(b) is required, pursuant to
     Treasury Regulation Section 1.704-1(b)(2)(iv)(m)(4), to be taken into
     account in determining Capital Accounts as a result of a distribution other
     than in liquidation of a Member's interest in the Company, the amount of
     such adjustment shall be treated as an item of gain (if the adjustment
     increases the basis of the asset) or loss (if the adjustment decreases such
     basis) from the disposition of such asset and shall be taken into account
     for purposes of computing Net Profit or Net Loss; and

          (g) Any items of income, gain, loss or deduction specially allocated
     under Section 7.03 shall be excluded.

     Section 12.41. "Nonrecourse Deductions" shall have the meaning set forth in
Treasury Regulations Section 1.704-2(b)(1).

     Section 12.42. "Nonrecourse Liability" shall have the meaning set forth in
Treasury Regulations Section 1.752-1(a)(2).

     Section 12.43. "Officer" means each Person who has been designated as, and
who has not ceased to be, an officer of the Company pursuant to Section 3.13
hereof, subject to the resolution of the Board appointing such Person as an
officer of the Company.

     Section 12.44. "Other Invested Capital" means, at any time, the aggregate
amount of Capital Contributions made in respect of all Units of a particular
class, other than Class A Units.

     Section 12.45. "Partially Adjusted Capital Account" means with respect to
any Member for any Fiscal Year, the Capital Account of such Member at the
beginning of such Fiscal Year, adjusted for any Capital Contributions and
distributions during such Fiscal Year and all special allocations pursuant to
Section 7.03 with respect to such Fiscal Year but before giving effect to any
allocations with respect to such Fiscal Year pursuant to Section 7.02.

     Section 12.46. "Permitted Transferee" shall mean (a) in the case of a
Sponsor Member, any other Person who is a member of the transferee's Investor
Group as of the

                                                                              29

Effective Date, (b) in the case of a natural person, any individual who received
a Member's Unit pursuant to applicable laws of descent and distribution or any
member of such Member's Family Group, (c) in the case of an entity, its
Affiliated entities.

     Section 12.47. "Person" means an individual, a partnership, a corporation,
a limited liability company, an association, a joint stock company, a trust, a
joint venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

     Section 12.48. "Qualified IPO" means a public offering and sale of equity
securities of the Company (or any other entity or entities created through any
Solvent Reorganization or designated by the Board), as the case may be, in any
transaction or series of related transactions, pursuant to an effective
registration statement (other than on Form S-4, S-8 or their equivalents) filed
under the United States Securities Act of 1933 which yields net proceeds to the
Company (or any other entity or entities created through any Solvent
Reorganization or designated by the Board) in excess of $150 million or which
results in least 15% of the total outstanding Units (or other securities) being
sold to the public in a primary offering.

     Section 12.49. "Registration Rights Agreement" means that certain
Registration Rights Agreement, dated as of the Effective Date, by and among the
Company and the Members, as it may be amended, supplemented or restated from
time to time.

     Section 12.50. "Solvent Reorganization" means any solvent reorganization of
the Company, including by merger, consolidation, recapitalization, Transfer or
sale of shares or assets, or contribution of assets and/or liabilities, or any
liquidation, exchange of securities, conversion of entity, migration of entity,
formation of new entity, or any other transaction or group of related
transactions (in each case other than to or with an unaffiliated third party),
in which:

          (i) all holders of the same class of equity securities of the Company
     are offered the same consideration in respect of such equity securities,

          (ii) the Members' pro rata indirect economic interests in the Company,
     relative to each other and all other holders of Interests, are preserved
     and

          (iii) the rights of the Members under this Agreement and the
     Registration Rights Agreement are preserved in all material respects.

     Section 12.51. "Sponsor Members" shall mean those Members who are members
of the BCP Investor Group, the Apollo Investor Group or the GS Investor Group.

     Section 12.52. "Subsidiary" means, with respect to any Person, any
corporation, limited liability company, partnership, association or other
business entity of which (i) if a corporation, a majority of the total voting
power of shares of stock entitled (without regard to the occurrence of any
contingency) to vote in the election of directors, managers or trustees thereof
is at the time owned or controlled, directly or indirectly, by that Person or
one or more of the other Subsidiaries of that Person or a combination thereof,
or (ii) if a limited liability company, partnership, association or other

                                                                              30

business entity, a majority of the total voting power of stock (or equivalent
ownership interest) of the limited liability company, partnership, association
or other business entity is at the time owned or controlled, directly or
indirectly, by any Person or one or more Subsidiaries of that Person or a
combination thereof. For purposes hereof, a Person or Persons shall be deemed to
have a majority ownership interest in a limited liability company, partnership,
association or other business entity if such Person or Persons shall be
allocated a majority of limited liability company, partnership, association or
other business entity gains or losses or shall be or control the managing
director or general partner of such limited liability company, partnership,
association or other business entity.

     Section 12.53. "Target Capital Account" means, with respect to any Member
as of any date, the amount (which may be either a positive or a negative
balance) equal to (a) the hypothetical distribution such Member would receive in
respect of such Member's Vested and Unvested Units if the Company distributed
(pursuant to Section 6.02 (as if such hypothetical distribution were the first
distribution of the Company) an amount equal to (i) the proceeds the Company
would receive upon a sale of all assets of the Company as of such date for cash
equal to the Gross Asset Value (taking into account any adjustment to Gross
Asset Value for such Fiscal Year) of such assets, plus (ii) the amount of all
cash and the Fair Market Value of any other assets that have been distributed by
the Company prior to such date, minus (iii) the amount necessary to satisfy all
Company liabilities in accordance with their terms (limited, in the case of
Nonrecourse Liabilities of the Company, to the Gross Asset Value of the assets
securing such liability), minus (b) the sum of (i) the amount of cash and the
Fair Market Value of any other assets distributed to such Member prior to such
date and (ii) such Member's share of Company Minimum Gain and Member Minimum
Gain, as determined pursuant to Treasury Regulations Sections 1.704-2(g) and
1.704-2(i) immediately prior to such sale.

     Section 12.54. "Treasury Regulations" means the final or temporary
regulations that have been issued by the U.S. Department of Treasury pursuant to
its authority under the Code, and any successor regulations.

     Section 12.55. "Unit" means a type of Membership Interest. Units may be
issued in different classes and in whole and fractional numbers. Except to the
extent otherwise provided herein, each Unit of a class represents the same
fractional interest in gross income, Net Profit, Net Loss and distributions as
each other Unit in such class.

     Section 12.56. "Unvested Units" shall mean, subject to Section 2.05 of the
Management Member's Agreement applicable to holders of Class B Units, Class C
Units and Class D Units, as of any date, the number of Class B, Class C or Class
D Units (determined separately for each class) equal to the product of (i) the
total number of Units of such class and (ii) the percentage equal to 100% less
the relevant Applicable Percentage (as defined in such Management Member's
Agreement).

     Section 12.57. "Vested Units" shall mean, (a) all Class A Units, and (b)
subject to Section 2.05 of the Management Member's Agreement applicable to
holders of Class B Units, Class C Units and Class D Units, as of any date, the
number of Class B, Class C or Class Units (determined separately for each class)
equal to the product of (i) the total number of Units and (ii) the relevant
Applicable Percentage (as defined in such Management Member's Agreement).

                                                                              31

                                  ARTICLE XIII

                                  MISCELLANEOUS

     Section 13.01. Assignment and Binding Effect. Neither the Company nor any
Member shall assign all or any part of this Agreement without the prior written
consent of the other. This Agreement shall be binding upon and inure to the
benefit of the successors and assigns of the parties pursuant to this paragraph.

     Section 13.02. Notices. Any notice, demand, request, waiver, or other
communication under this Agreement shall be personally served in writing, shall
be deemed to have been given on the date of service, and shall be addressed as
follows:

                    TO THE COMPANY:    Nalco LLC
                                       1601 West Diehl Road
                                       Naperville, Illinois 60563

                                       Attention: General Counsel
                                       Fax: (630) 305-2937

                                       Attention: Chinh Chu
                                       Fax: (212) 583-5722

                                       Attention: Joshua J. Harris
                                       Fax: (212) 515-3288

                                       Attention: Sanjeev Mehra
                                       Fax: (212) 357-5505

                  With a copy to:      Simpson Thacher & Bartlett LLP
                                       425 Lexington Avenue
                                       New York, NY  10017
                                       Attention: Wilson S. Neely
                                       Fax: (212) 455-2502

                   And a copy to:      Wachtell, Lipton, Rosen & Katz
                                       51 West 52nd Street
                                       New York, NY 10019
                                       Attention: Daniel A. Neff
                                       Fax: (212) 403-2000

             TO ANY MEMBER OF THE      Blackstone Capital Partners IV, L.P.
              BCP INVESTOR GROUP:      345 Park Avenue
                                       New York, NY 10154
                                       Attention: Chinh Chu
                                       Fax:  (212) 583-5722

                                                                              32

                  With a copy to:      Simpson Thacher & Bartlett LLP
                                       425 Lexington Avenue
                                       New York, NY  10017
                                       Attention: Wilson S. Neely
                                       Fax: (212) 455-2502

             TO ANY MEMBER OF THE      Apollo Investment Fund V, L.P.
           APOLLO INVESTOR GROUP:      1301 Avenue of the Americas
                                       New York, New York 10019
                                       Attention: Joshua J. Harris
                                       Fax: (212) 515-3288

                  With a copy to:      Wachtell, Lipton, Rosen & Katz
                                       51 West 52nd Street
                                       New York, NY 10019
                                       Attention: Daniel A. Neff
                                       Fax: (212) 403-2000

             TO ANY MEMBER OF THE      GS Capital Partners 2000, L.P.
               GS INVESTOR GROUP:      85 Broad Street
                                       New York, New York 10004
                                       Attention: Sanjeev Mehra
                                       Fax: (212) 357-5505

                  With a copy to:      Wachtell, Lipton, Rosen & Katz
                                       51 West 52nd Street
                                       New York, NY 10019
                                       Attention: Daniel A. Neff
                                       Fax: (212) 403-2000

              TO ANY OTHER MEMBER      At the address set forth on the attached
                                       signature page.

     Section 13.03. Governing Law. THIS AGREEMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH, AND GOVERNED BY, THE LAWS OF THE STATE OF DELAWARE WITHOUT
REGARD TO CONFLICTS OF LAWS PRINCIPLES WHICH WOULD RESULT IN THE APPLICATION OF
THE LAWS OF ANOTHER JURISDICTION.

     Section 13.04. Jurisdiction. The parties hereby irrevocably and
unconditionally consent to submit to the exclusive jurisdiction of the courts of
the State of Delaware for any actions, suits or proceedings arising out of or
relating to this Agreement and the transactions contemplated hereby (and agree
not to commence any action, suit or proceeding relating thereto except in such
courts, and further agree that service of any process, summons, notice or
document by U.S. registered mail to its address set forth above shall be
effective service of process for any action, suit or proceeding brought against
such party in any such court). The parties hereby irrevocably and
unconditionally waive any objection to the laying of venue of any action, suit
or proceeding arising out of this Agreement or the transactions contemplated
hereby in the

                                                                              33

courts of the State of Delaware, and hereby further irrevocably and
unconditionally waive and agree not to plead or claim in any such court that any
such action, suit or proceeding brought in any such court has been brought in an
inconvenient forum.

     Section 13.05. Entire Agreement. This Agreement, the Management Members
Agreement and the Registration Rights Agreement set forth the entire
understanding and agreement of the parties hereto and supersede any and all
other understandings, term sheets, negotiations or agreements between the
parties hereto relating to the subject matter of this Agreement and the
Registration Rights Agreement. In the event of any conflict between a provision
of this Agreement and a provision of the Management Members Agreement, the
relevant provision of this Agreement shall be deemed to control and shall
supersede the conflicting provision of the Management Members Agreement.

     Section 13.06. Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original, and all of which
together shall constitute a single agreement.

     Section 13.07. Severability. In the event that any one or more of the
provisions contained in this Agreement shall for any reason be held to be
invalid, illegal or unenforceable, the same shall not affect any other provision
of this Agreement, but this Agreement shall be construed in a manner which, as
nearly as possible, reflects the original intent of the parties.

     Section 13.08. Interpretation. Words used in the singular form in this
Agreement shall be deemed to import the plural, and vice versa, as the sense may
require. The table of contents and headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever the words "include," "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."

     Section 13.09. Amendment and Modification. From and after the Effective
Date, until the First Investor Sell Down Date, this Agreement may only be
modified or amended by the agreement of at least two of the Investor Groups.
From and after the First Investor Sell Down Date until the Second Investor Sell
Down Date, this Agreement may only be modified or amended by the agreement of
the Investor Groups which are each still entitled to designate two
Representatives pursuant to Section 3.07(a). From and after the Second Investor
Sell Down Date, this Agreement may be modified or amended by Members holding a
majority of all outstanding Units. Notwithstanding anything to the contrary in
this Section 13.09, any modification or amendment of this Agreement that
adversely affects any Investor Group disproportionately relative to the other
Investor Groups, or from and after the Second Investor Sell Down Date, which
adversely affects any Investor Group, shall require the agreement of the
affected Investor Group.

     Section 13.10. Waiver. Any party hereto may (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in any document delivered pursuant hereto, and (iii)
waive compliance with any of the agreements or conditions contained herein. Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in an instrument in writing signed by the party

                                                                              34

granting such waiver but such waiver or failure to insist upon strict compliance
with such representation or warranty, obligation, covenant, agreement or
condition shall not operate as a waiver of, or estoppel with respect to, any
subsequent or future failure.

     Section 13.11. Further Assurances. Subject to the terms and conditions of
this Agreement, each of the parties hereto will use its reasonable efforts to
take, or cause to be taken, all actions, 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 provisions of this Agreement.

     Section 13.12. Sections, Exhibits. References to a section are, unless
otherwise specified, to one of the sections of this Agreement and references to
an "Exhibit" or "Schedule" are, unless otherwise specified, to one of the
exhibits or schedules attached to this Agreement.

     Section 13.13. Specific Enforcement. The Members and the Company
acknowledge and agree that irreparable damage would occur in the event that any
of the provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached. It is accordingly agreed that the
parties shall be entitled to an injunction or injunctions to prevent breaches of
the provisions of this Agreement and to enforce specifically the terms and
provisions hereof, this being in addition to any other remedy to which they may
be entitled at law or in equity.

     Section 13.14. Successors. Permitted Transferees are entitled to all of the
rights and subject to all of the obligations of the transferor hereunder from
whom they received their Units regardless of whether the Agreement elsewhere so
expressly provides.

                                                                              35

                                   Schedule A

--------------------------------- -------------------- -------------------------
            Name                  Capital Contribution Class A Units Outstanding
--------------------------------- -------------------- -------------------------
Blackstone Capital Partners         195,616,401.92         19,561,640,192
IV L.P.
--------------------------------- -------------------- -------------------------
Blackstone Capital Partners           3,109,762.66            310,976,266
IV-A L.P.
--------------------------------- -------------------- -------------------------
Blackstone Family Investment          4,055,635.61            405,563,561
Partnership IV-A L.P.
--------------------------------- -------------------- -------------------------
Apollo Investment Fund V, L.P.       127,889,568.46         12,788,956,846
--------------------------------- -------------------- -------------------------
AP Nalco LP                          36,701,195.91           3,670,119,591
--------------------------------- -------------------- -------------------------
Apollo/Nalco Acquisition LLC         38,191,035.81           3,819,103,581
--------------------------------- -------------------- -------------------------
Goldman Sachs Direct Investment       5,438,013.38            543,801,338
Fund 2000, L.P.
--------------------------------- -------------------- -------------------------
GS Capital Partners 2000, L.P.       77,737,874.60           7,773,787,460
--------------------------------- -------------------- -------------------------
GS Capital Partners 2000             28,246,949.85           2,824,694,985
Offshore, L.P.
--------------------------------- -------------------- -------------------------
GS Capital Partners 2000 Gmbh &       3,249,267.30            324,926,730
Co. Beteiligungs Kg
--------------------------------- -------------------- -------------------------
GS Capital Partners 2000 Employee    24,699,585.50           2,469,958,550
Fund, L.P.
--------------------------------- -------------------- -------------------------
NH Acquisition LLC                     40,797.00               4,079,700
--------------------------------- -------------------- -------------------------
William H. Joyce                     11,200,000.00           1,120,000,000
--------------------------------- -------------------- -------------------------
TOTAL OUTSTANDING CLASS A UNITS                             55,617,608,800
--------------------------------- -------------------- -------------------------

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first written above.

                                       BLACKSTONE CAPITAL PARTNERS IV L.P.

                                       By: Blackstone Management Associates IV
                                           L.L.C., its General Partner

                                       By: /s/ Chinh Chu
                                           -------------------------------------
                                           Name: Chinh Chu
                                           Title: Member

                                       BLACKSTONE CAPITAL PARTNERS IV-A L.P.

                                       By: Blackstone Management Associates IV
                                           L.L.C., its General Partner

                                       By: /s/ Chinh Chu
                                           -------------------------------------
                                           Name: Chinh Chu
                                           Title: Member

                                       BLACKSTONE FAMILY INVESTMENT PARTNERSHIP
                                       IV-A L.P.

                                       By: Blackstone Management Associates IV
                                           L.L.C., its General Partner

                                       By: /s/ Chinh Chu
                                           -------------------------------------
                                           Name: Chinh Chu
                                           Title: Member

                        [Signature Page to LLC Agreement]

                                       APOLLO INVESTMENT FUND V, L.P.

                                       By: Apollo Advisors V, L.P. Its general
                                           partner

                                       By: Apollo Capital Management V, Inc. Its
                                           general partner

                                       By: /s/ Josh Harris
                                           -------------------------------------
                                           Name: Josh Harris
                                           Title: Senior Partner

                                       APOLLO/NALCO ACQUISITION LLC

                                       By: Apollo Management V, L.P., its
                                           Manager

                                       By: AIF V Management, Inc., its General
                                           Partner

                                       By: /s/ Josh Harris
                                           -------------------------------------
                                           Name: Josh Harris
                                           Title: Senior Partner

                                       AP  NALCO LP

                                       By: Apollo Advisors V, L.P., its General
                                           Partner

                                       By: Apollo Capital Management V, Inc.,
                                           its General Partner

                                       By: /s/ Josh Harris
                                           -------------------------------------
                                           Name: Josh Harris
                                           Title: Senior Partner

                        [Signature Page to LLC Agreement]

                                       GOLDMAN SACHS DIRECT INVESTMENT
                                       FUND 2000, L.P.

                                          By: GS Employee Funds 2000 GP, L.L.C.,
                                              its General Partner

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                                       GS CAPITAL PARTNERS 2000, L.P.

                                          By: GS Advisors 2000, L.L.C.,
                                              its General Partner

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                                       GS CAPITAL PARTNERS 2000 OFFSHORE, L.P.

                                          By: GS Advisors 2000, L.L.C.,
                                              its General Partner

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                                       GS CAPITAL PARTNERS 2000 GMBH & CO.
                                       BETEILIGUNGS KG

                                          By: Goldman Sachs Management GP GmbH,
                                              its General Partner

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                        [Signature Page to LLC Agreement]

                                       GS CAPITAL PARTNERS 2000 EMPLOYEE
                                       FUND, L.P.

                                          By: GS Employee Funds 2000 GP, L.L.C.,
                                              its General Partner

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                                       NH ACQUISITION LLC

                                          By: GS Advisors 2000, L.L.C.,
                                              its Manager

                                              By: /s/ John E. Bowman
                                                  ------------------------------
                                                  Name: John E. Bowman
                                                  Title: Vice President

                        [Signature Page to LLC Agreement]

                                       WILLIAM H. JOYCE

                                       /S/ William H. Joyce
                                       -----------------------------------------

                                       Address for Notices:

                                       12 Shepard Hill Road
                                       Newtown, Connecticut 06470

                        [Signature Page to LLC Agreement]EXHIBIT 10.30

                          MANAGEMENT MEMBERS AGREEMENT

                                   CONCERNING

                                    NALCO LLC

                           DATED AS OF JUNE 11, 2004.

     This MANAGEMENT MEMBERS AGREEMENT (the "Agreement") dated as of June 11,
2004 by and among Nalco LLC (the "Company"), a Delaware limited liability
company and the Persons who are or after the date hereof become signatories
hereto (the "Management Members").

                                    RECITALS

     WHEREAS, the Company is governed by that certain Second Amended and
Restated Limited Liability Company Operating Agreement (the "LLC Agreement")
dated as of May 17, 2004.

     WHEREAS, the Management Members will be providing services to the Company
or its Affiliates.

     WHEREAS, each Management Member will subscribe for and acquire from the
Company, and the Company will issue and sell to each Management Member, the
Company's Class A Units (the "Units"), in the amounts set forth on Schedule A to
the LLC Agreement, as the same may be amended from time to time;

     WHEREAS, it is a condition to the sale of the Units that the Management
Members enter into this Agreement;

     WHEREAS, the Management Members will enter into the Registration Rights
Agreement; and

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

                                   ARTICLE I

         Management Members' Representations, Warranties and Agreements

     Section 1.01. Units Unregistered. Each Management Member acknowledges and
represents that such Management Member has been advised by the Company that:

     (a)  the offer and sale of the Units have not been registered under the
          1933 Act;

     (b)  the Units must be held and the Management Member must continue to bear
          the economic risk of the investment in the Units unless the offer and
          sale of such Units are subsequently registered under the 1933 Act and
          all applicable state securities laws or an exemption from such
          registration is available and the Units may never be so registered;

     (c)  there is no established market for the Units and it is not anticipated
          that there will be any public market for the Units in the foreseeable
          future;

                                      -1-

     (d)  a restrictive legend in the form set forth below shall be placed on
          the certificates representing the Units:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE
          ORIGINALLY ISSUED ON ______________, HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
          "ACT"), AND MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF
          AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR AN
          EXEMPTION FROM REGISTRATION THEREUNDER. THE SECURITIES
          REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO CERTAIN
          TRANSFER AND OTHER RESTRICTIONS SET FORTH IN THE LIMITED
          LIABILITY COMPANY AGREEMENT, DATED AS OF MAY 17, 2004 AMONG
          NALCO LLC AND CERTAIN OF ITS MEMBERS, THE MANAGEMENT MEMBERS
          AGREEMENTS, DATED AS OF JUNE 11, 2004 AMONG NALCO LLC AND
          CERTAIN MANAGEMENT MEMBERS NAMED THEREIN, THE REGISTRATION
          RIGHTS AGREEMENT AMONG NALCO LLC AND CERTAIN OF ITS MEMBERS
          AND, AMONG OTHER THINGS, MAY NOT BE OFFERED OR SOLD EXCEPT
          IN COMPLIANCE WITH SUCH TRANSFER RESTRICTIONS. COPIES OF
          SUCH LIMITED LIABILITY COMPANY AGREEMENT, SUCH MANAGEMENT
          MEMBERS AGREEMENTS AND SUCH REGISTRATION RIGHTS AGREEMENT
          ARE ON FILE WITH THE SECRETARY OF THE LIMITED LIABILITY
          COMPANY AND ARE AVAILABLE WITHOUT CHARGE UPON WRITTEN
          REQUEST THEREFOR. THE HOLDER OF THIS CERTIFICATE, BY
          ACCEPTANCE OF THIS CERTIFICATE, AGREES TO BE BOUND BY ALL OF
          THE APPLICABLE PROVISIONS OF THE AFORESAID AGREEMENTS.";

     (e)  a restrictive legend in the form set forth below shall be placed on
          the certificates representing the Units held by Georgia residents:

          "THESE SECURITIES HAVE BEEN ISSUED OR SOLD IN RELIANCE ON
          PARAGRAPH 13 OF CODE SECTION 10-5-9 OF THE "GEORGIA
          SECURITIES ACT OF 1973," AND MAY NOT BE SOLD OR TRANSFERRED
          EXCEPT IN A TRANSACTION WHICH IS EXEMPT UNDER SUCH ACT OR
          PURSUANT TO AN EFFECTIVE REGISTRATION UNDER SUCH ACT."; and

                                 -2-

     (f)  a notation shall be made in the appropriate records of the Company
          indicating that the Units are subject to restrictions on transfer and,
          if the Company should at some time in the future engage the services
          of a securities transfer agent, appropriate stop-transfer instructions
          may be issued to such transfer agent with respect to the Units.

     Section 1.02. Additional Investment Representations. Each Management Member
represents and warrants that:

     (a)  the Management Member's financial situation is such that such
          Management Member can afford to bear the economic risk of holding the
          Units for an indefinite period of time, has adequate means for
          providing for the Management Member's current needs and personal
          contingencies, and can afford to suffer a complete loss of the
          Management Member's investment in the Units;

     (b)  the Management Member's knowledge and experience in financial and
          business matters are such that the Management Member is capable of
          evaluating the merits and risks of the investment in the Units;

     (c)  the Management Member understands that the Units are a speculative
          investment which involves a high degree of risk of loss of Management
          Member's investment therein, there are substantial restrictions on the
          transferability of the Units and, on the date on which such Management
          Member acquires such Units and for an indefinite period following such
          date, there will be no public market for the Units and, accordingly,
          it may not be possible for the Management Member to liquidate the
          Management Member's investment including in case of emergency, if at
          all;

     (d)  the terms of this Agreement provide that if the Management Member
          ceases to provide services to the Company and its Affiliates, the
          Company and its Affiliates have the right to repurchase the Units at a
          price which may be less than the Fair Market Value thereof;

     (e)  the Management Member understands and has taken cognizance of all the
          risk factors related to the purchase of the Units and, other than as
          set forth in this Agreement, no representations or warranties have
          been made to the Management Member or Management Member's
          representatives concerning the Units, the Company, the Subsidiaries or
          their respective prospects or other matters;

     (f)  the Management Member has been given the opportunity to examine all
          documents and to ask questions of, and to receive answers from, the
          Company and its representatives concerning the Company and its
          subsidiaries, the acquisition of Nalco Company and certain
          Subsidiaries of Nalco International S.A.S. by subsidiaries of the
          Company, the LLC Agreement, the Company's organizational documents and
          the terms and conditions of the purchase of the

                                       -3-

          Units and to obtain any additional information which the Management
          Member deems necessary; and

     (g)  all information which the Management Member has provided to the
          Company and the Company's representatives concerning the Management
          Member and the Management Member's financial position is complete and
          correct as of the date of this Agreement.

     Section 1.04. Contingent Bonus. The Company shall cause one of its
Subsidiaries to pay a bonus to Management Members in the circumstances set forth
in Exhibit A.

                                   ARTICLE II

                             Transfers; Acceleration

     Section 2.01. Transfer. (a) Until the occurrence of a Qualified IPO, except
as required by law, no Management Member may directly or indirectly, sell,
contract to sell, give, assign, hypothecate, pledge, encumber, grant a security
interest in, offer, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase, lend, or
otherwise transfer or dispose of any economic, voting or other rights in or to
(collectively, "Transfer") any Units except pursuant to (i) Article XI of the
LLC Agreement, (ii) Sections 2.02 or 2.04 hereof or (iii) a Transfer to a
Manager Permitted Transferee (each a "Permitted Transfer").

     (b) Following a Qualified IPO and the expiration of any underwriter or
Company "lock-up" period (as provided for in Section 4(a) of the Registration
Rights Agreement or otherwise) applicable to such Qualified IPO, each Management
Member may only Transfer its Units pursuant to (i) a Permitted Transfer, (ii) a
Transfer pursuant to Section 2.03, (iii) a Transfer in accordance with the
Registration Rights Agreement or (iv) a Transfer conducted in accordance with
the requirements of Rule 144 promulgated under the 1933 Act; provided, that no
Management Member shall make a Transfer pursuant to this clause (iv) without the
Company's prior, written approval.

     (c) No Transfer by any Management Member may be made pursuant to this
Article II unless (i) the transferee has agreed in writing to be bound by the
terms and conditions of this Agreement and the LLC Agreement (other than if the
Transfer is conducted in accordance with the Registration Rights Agreement or
the requirements of Rule 144 promulgated under the 1933 Act), (ii) the Transfer
complies in all respects with the applicable provisions of this Agreement, (iii)
the Transfer complies in all respects with applicable federal and state
securities laws, including the 1933 Act and (iv) the Transfer is made in
compliance with all applicable Company policies and restrictions (including any
trading "window periods" or other policies regulating insider trading);
provided, that the conditions to Transfer described in clause (i) above shall
not apply to a Transfer pursuant Article XI of the LLC Agreement or Sections
2.02, 2.03 or 2.04 hereof.

                                      -4-

     (d) No Transfer by any Management Member may be made pursuant to this
Article II (except pursuant to an effective registration statement under the
1933 Act) unless and until such Management Member has first delivered to the
Company an opinion of counsel (reasonably acceptable in form and substance to
the Company) that neither registration nor qualification under the 1933 Act and
applicable state securities laws is required in connection with such Transfer.

     Section 2.02. Call Option. (a) If a Management Member's Services to the
Company or any Subsidiary terminate for any of the reasons set forth in clauses
(i), (ii) or (iii) below (each such event a "Termination Event"), the Company
shall have the right but not the obligation to purchase, from time to time after
such termination of Services, any Units held by such Management Member for a
period of 60 days (subject to extension as provided below) immediately following
the later of (A) the date of the Termination Event and (B) the date that is six
(6) months and one day after the date on which such Management Member acquired
such Unit (the later of (A) and (B), the "First Purchase Date"), and such
Management Member shall be required to sell to the Company, any or all of such
Units then held by such Management Member, at a price per Unit equal to the
applicable purchase price determined pursuant to Section 2.02(c):

          (i) if such Management Member's Service with the Company and its
     Subsidiaries is terminated due to the Disability or death of the Management
     Member;

          (ii) if such Management Member's Service with the Company and its
     Subsidiaries is terminated by the Company and its Subsidiaries without
     Cause or by the Management Member for any reason;

          (iii) if such Management Member's Service with the Company and its
     Subsidiaries is terminated by the Company or any of its Subsidiaries for
     Cause.

                  (b) If on the 61st day following the date of the Termination
Event, the Company has not purchased all of a terminated Management Member's
       Units, and the Company has not opted to extend its 60 day election period
pursuant to Section 2.02(d), the Company shall on or before the 61st day provide
written notice to the Investor Groups of (i) its decision not to purchase some
or all of such Units and (ii) the number of such Management Member's Eligible
Units (defined below) which the Company did not purchase, and the Investor
Groups shall have the right to purchase and such Management Member shall be
required to sell to the Investor Group(s), any or all of the Units (the
"Eligible Units") then held by such Management Member at a price per Unit equal
to the applicable purchase price determined pursuant to Section 2.02(c). The
Investor Groups' rights to purchase such Eligible Units and each Management
Member's corresponding obligation to sell such Eligible Units shall terminate on
the 120th day following the date of the Termination Event. Upon receipt of the
written notice described above, each Investor Group desiring to purchase Units
shall within 45 days of receipt of the Company's notice provide written notice
to the Company, specifying that such Investor Group is willing to purchase
either (i) its pro rata share of the Eligible Units (based upon the number of
Units held by such Investor Group relative to the total number of Units held by
all of the Investor Groups),

                                      -5-

(ii) a number of Eligible Units less than such Investor Group's pro rata share,
or (iii) any and all Units available to be purchased; provided, that the
Investor Groups shall, as much as reasonably practicable, consult with each
other and coordinate the exercise of rights such that all Eligible Units are
elected to be purchased. Upon receipt of the Investor Groups' respective
notices, the Company will notify the Management Member of the Investor Group(s)'
elections and the Management Member will be obligated to sell (x) to the
Investor Groups making elections described in clauses (i) and (ii) of the
preceding sentence, the number of Eligible Units elected to be purchased by such
Investor Groups and (y) all remaining Eligible Units, if any, to the Investor
Groups making the election described in clause (iii) of the preceding sentence
to such Investor Group(s) on a pro rata basis (based upon the number of Units
held by such Investor Group relative to the total number of Units held by all of
the Investor Groups making such election), but in no event more that any such
Investor Groups elected to purchase.

     (c) In the event of a purchase by the Company pursuant to Section 2.02(a)
and/or the Investor Group(s) pursuant to Section 2.02(b) (each a "Units Buyer"),
the purchase price shall be:

          (i) in the case of a Termination Event specified in Section 2.02(a)(i)
     or 2.02(a)(ii) a price per Unit equal to the most recently determined Fair
     Market Value, and

          (ii) in the case of a Termination Event specified in Section
     2.02(a)(iii), a price per Unit equal to the lesser of (1) Fair Market Value
     and (2) Cost.

     (d) The Units Buyer may pay the purchase price for such Units (i) by
delivery of funds deposited into an account designated by the Management Member,
a bank cashier's check, a certified check or a company check of the Units Buyer
for the purchase price; (ii) if the Units Buyer is the Company and is prohibited
from paying cash by financing or liquidity constraints and is unable to pay the
purchase price as provided in clause (iii), by delaying the exercise of the
purchase right described under Section 2.02(a) until the earlier of (x) when the
financing restrictions lapse and (y) when the Company is able to pay the
purchase price as provided in clause (iii); or (iii) if the Units Buyer is the
Company and has the right to purchase such Units during the period following a
Qualified IPO (including in respect of a purchase that was delayed pursuant to
clause (ii)), by delivery of a number of shares of Issuer Common Stock
determined by dividing (A) the aggregate purchase price of the Units being sold
by such Management Member by (B) the Public Share FMV as of the close of trading
on the trading day immediately prior to the delivery thereof to the Management
Member. Notwithstanding anything to the contrary in this Agreement, the Units
Buyer may deduct and withhold from the amounts otherwise payable pursuant to
this Agreement such amounts as necessary to comply with the Internal Revenue
Code of 1986, as amended, or any other provision of applicable law, with respect
to the making of such payment.

     (e) Notwithstanding anything to the contrary elsewhere herein, the Company
shall not be obligated to purchase any Units at any time pursuant to this
Section 2.02, regardless of whether it has delivered a notice of its election to
purchase any such Units, (i) to the extent that (A) the purchase of such Units
(together with any other purchases of Units pursuant to

                                      -6-

Sections 2.02 or 2.03 hereof, or pursuant to similar provisions in any other
agreements with other investors of which the Company has at such time been given
or has given notice) or (B) in the event of an election to purchase such Units
with shares of Issuer Common Stock, the issuance of such shares by the IPO
Entity, the purchase of such shares by the Company or the distribution of such
shares to the Management Member would result (x) in a violation of any law,
statute, rule, regulation, policy, order, writ, injunction, decree or judgment
promulgated or entered by any governmental authority applicable to the Company
or any of its Subsidiaries or any of its or their assets (including any
unavailability of a registration statement or exemption from registration
necessary to allow delivery of shares of Issuer Common Stock to the Management
Member), (y) after giving effect thereto (including any dividends or other
distributions or loans from a Subsidiary of the Company to the Company in
connection therewith), in a Financing Default or (z) in the Company being
required to disgorge any profit to the IPO Entity pursuant to Section 16(b) of
the 1934 Act, (ii) if immediately prior to such purchase of Units, issuance of
Issuer Common Stock or purchase of shares of Issuer Common Stock, as the case
may be, there exists a Financing Default which prohibits such issuance or
purchase (including any dividends or other distributions or loans from a
Subsidiary of the Company to the Company in connection therewith), or (iii) if
the Company does not have funds available to effect such purchase of Units or
Issuer Common Stock. The Company shall within 30 days of learning of any such
fact so notify the Management Member that it is not obligated to purchase such
Units and has deferred its right to make such purchase until such violation,
potential liability under the 1933 Act or 1934 Act, Financing Default or
unavailability of funds would not result therefrom or has ceased. The Company
agrees to use commercially reasonable efforts to cure any such Financing Default
that is curable. To the extent that, pursuant to this Section 2.02(e), the
Company is not obligated to pay for a Management Member's Units in accordance
with one of the payment methods described in the first sentence of Section
2.02(d), the Company shall, except as otherwise permitted by this Section
2.02(e), be required to pay for such Units pursuant to an alternate method of
payment described in the first sentence of Section 2.02(d).

     (f) Notwithstanding anything to the contrary contained in this Section
2.02, any Units which the Company has elected to purchase from a Management
Member, but which in accordance with Section 2.02(e) are not purchased at the
applicable time provided in this Section 2.02, shall be purchased by the Company
on the tenth Business Day after such date or dates that it is no longer
permitted to defer purchasing such Units under Section 2.02(e), and the Company
shall give such Management Member five Business Days prior notice of any such
purchase.

     Section 2.03. Put Right. (a) Subject to the Call Right described in Section
2.02, following a Qualified IPO and for so long as no Termination Event pursuant
to Section 2.02(a)(iii) shall have occurred with respect to a Management Member,
such Management Member shall have the right, but not the obligation, to sell
(the "Put Right") beginning on the later of (x) the first date immediately
following the expiration of any Company or underwriter "lock-up" period
applicable to such Qualified IPO and (y) the date that is at least six (6)
months and one day after, the Sale Date ( the later of (x) and (y) shall be
referred to as the "First Put Date"), and the Company shall be required to
purchase from such Management Member, a number of such Management Member's Units
as determined by such Management Member, at a price per Unit equal to the Fair
Market Value as of the date the Management Member exercises

                                      -7-

such Put Right. For the avoidance of doubt, subject to the Call Right described
in Section 2.02, a Management Member shall remain entitled to the Put Right
following a Termination Event pursuant to Sections 2.02(a)(i) or (ii) with
respect to such Management Member.

     (b) Each Management Member who desires to sell any of his or her Units
following the applicable First Put Date shall send written notice to the Company
of his or her intention to sell such Units pursuant to this Section 2.03.
Subject to the exercise of any Call Right pursuant to Section 2.02, the closing
of the purchase shall take place at the principal office of the Company on a
date specified by the Company no later than 30 days after the giving of such
notice.

     (c) At the closing of a purchase pursuant to a Put Right, the Company will
pay to the Management Member the purchase price for such Units (determined in
accordance with Section 2.03(a)) by delivery of a number of shares of Issuer
Common Stock determined by dividing (A) the aggregate purchase price of the
Units being sold by such Management Member by (B) the Public Share FMV as of the
close of trading on the trading day immediately prior to the delivery thereof to
the Management Member.

     (d) Notwithstanding anything to the contrary elsewhere herein, the Company
shall not be obligated to purchase any Units at any time pursuant to this
Section 2.03 (i) to the extent that (A) the purchase of such Units (together
with any other purchases of Units pursuant to Sections 2.02 or 2.03 hereof, or
pursuant to similar provisions in any other agreements with other investors of
which the Company has at such time been given or has given notice) or (B) the
issuance of shares by the IPO Entity or the purchase of such shares by the
Company would result (x) in a violation of any law, statute, rule, regulation,
policy, order, writ, injunction, decree or judgment promulgated or entered by
any governmental authority applicable to the Company or any of its Subsidiaries
or any of its or their assets (including any unavailability of a registration
statement or exemption from registration necessary to allow delivery of shares
of Issuer Common Stock to the Management Member(s)), (y) after giving effect
thereto, in a Financing Default or (z) in the Company being required to disgorge
any profit to the IPO Entity pursuant to Section 16(b) of the 1934 Act or (ii)
if immediately prior to such purchase of Units, issuance of Issuer Common Stock
or purchase of shares of Issuer Common Stock, as the case may be, there exists a
Financing Default which prohibits any such issuance or purchase. The Company
agrees to use commercially reasonable efforts to cure any such Financing Default
that is curable. To the extent that the Company is not obligated to pay for any
Units as described in the first sentence of Section 2.03(c) pursuant to the
terms of this Section 2.03(d), the Company shall promptly notify any Management
Member that has delivered a notice of exercise of a Put Right that it is not
obligated to purchase such Units and has deferred its right to make such
purchase until such violation, potential liability under the 1933 Act or 1934
Act or Financing Default would not result therefrom or has ceased.

     (e) Notwithstanding anything to the contrary contained in this Section
2.03, any Units which a Management Member has elected to sell to the Company,
but which in accordance with Section 2.03(d) are not purchased at the applicable
time provided in this Section 2.03, shall be purchased by the Company on the
tenth Business Day after such date or dates that it is no

                                      -8-

longer permitted to defer purchasing such Units under Section 2.03(d), and the
Company shall give such Management Member five Business Days prior notice of any
such purchase.

     Section 2.04. Tag-Along Right. (a) If, at any time prior to a Qualified
IPO, one or more Sponsor Members propose to Transfer, in a single transaction or
a series of related transactions, a number of Units representing at least 30% of
the Sponsor Members' aggregate Initial Equity Stakes (as defined in the LLC
Agreement) to any Person (other than a Transfer to a Permitted Transferee (as
defined in the LLC Agreement) of any such Sponsor Member and other than a
Transfer in accordance with the Registration Rights Agreement and other than to
another Sponsor Member) (a "Tag-Along Purchaser"), then, unless such
transferring Sponsor Member(s) are entitled to give and do give a Drag-Along
Sale Notice (as defined in the LLC Agreement) and no other Sponsor Member(s) has
elected to purchase its pro rata share of such Units pursuant to Section 2.04(a)
of the Sponsor Agreement, the Company shall first provide written notice to each
of the Management Members, which notice (the "Tag-Along Notice") shall state:
(i) the maximum number of Units proposed to be Transferred (the "Tag-Along
Securities"); (ii) the purchase price per Unit (the "Tag-Along Price") for the
Tag-Along Securities and (iii) any other material terms and conditions of such
sale, including the proposed transfer date (which date will be within 60
business days after the termination of the Election Period (defined below),
subject to extension for any required regulatory approvals). Each of the
Management Members that has been provided with the Tag-Along Notice (each, a
"Tag-Along Manager") shall have the right to sell to such Tag-Along Purchaser,
upon the terms set forth in the Tag-Along Notice, up to the aggregate number of
Units which are held by such Tag-Along Manager multiplied by a fraction, the
numerator of which is the aggregate number of Units proposed to be sold by the
transferring Sponsor Member as reflected in the Tag-Along Notice and the
denominator of which is the total number of Units which are held by the
transferring Sponsor Member. If the number of Units elected to be sold by the
Tag-Along Managers and any other individuals identified from time to time on
Exhibit A to the LLC Agreement, the transferring Sponsor Member and any other
Sponsor Members electing to participate in such sale is greater than the number
of Tag-Along Securities specified in the Tag-Along Notice, the number of Units
being sold by each such seller shall be reduced such that the applicable seller
shall be entitled to (and obligated to) sell only their pro rata share of Units
(based on the aggregate number of Units held by such seller to the total number
of Units held by all of such electing sellers). The transferring Sponsor
Member(s), the Sponsor Members electing to participate in such sale and the
Tag-Along Manager(s) exercising their rights pursuant to this Section 2.04 shall
effect the sale of the Tag-Along Securities, and such Tag-Along Manager(s) shall
sell the number of Tag-Along Securities required to be sold by such Tag-Along
Manager(s) pursuant to this Section 2.04(a) within 60 business days after the
expiration of the Election Period, subject to extension for any required
regulatory approvals.

     (b) The tag-along rights provided by this Section 2.04 must be exercised by
any Tag-Along Manager wishing to sell its Units within 10 business days
following the date of delivery of the Tag-Along Notice (the "Election Period"),
by delivery of a written notice to the Company indicating such Tag-Along
Manager's wish to irrevocably exercise its rights and specifying the number of
Units (up to the maximum number of Units owned by such Tag-Along Manager
requested to be purchased by such Tag-Along Purchaser) it wishes to sell;
provided that

                                       -9-

any Tag-Along Manager may waive its rights under this Section 2.04 prior to the
expiration of such 10-business day period by giving written notice to the
Company, which will be distributed by the Company to the transferring Sponsor
Member(s). The failure of a Tag-Along Manager to respond within such 10-business
day period shall be deemed to be a waiver of such Tag-Along Manager's rights
under this Section 2.04.

     (c) In connection with any sale pursuant to this Section 2.04, each
Tag-Along Manager shall make to the Tag-Along Purchaser the same
representations, warranties, covenants, indemnities and agreements as the
transferring Sponsor Member(s) makes in connection with the proposed transfer
(except that in the case of representations, warranties, covenants, indemnities
and agreements pertaining specifically to the transferring Sponsor Member(s), a
Tag-Along Manager shall make the comparable representations, warranties,
covenants, indemnities and agreements); provided that all representations,
warranties and indemnities shall be made by the transferring Sponsor Member(s)
and such Tag-Along Manager severally and not jointly and that the liability of
the transferring Sponsor Member(s) and such Tag-Along Manager thereunder shall
be borne by each of them on a pro rata basis. The Tag-Along Managers shall
receive the same type and amount of consideration (and rights) per Unit as is
paid or delivered to the transferring Sponsor Member(s) in the sale pursuant to
Section 2.04(a).

     (d) No Transfer of any Unit pursuant to this Section 2.04 shall be
effective unless and until the applicable transferee agrees to be bound by all
of the terms and conditions of the LLC Agreement.

     Section 2.05. Fair Market Value. Either the Board or the compensation
committee of the Board shall undertake in good faith to determine the Fair
Market Value of the Units no less frequently than annually and on a quarterly
basis if necessary in connection with a Transfer of Units to the Company
pursuant to Section 2.02 or Section 2.03 of this Agreement. Such determination
shall be made in the sole discretion of the Board or the compensation committee
of the Board, as the case may be.

                                  ARTICLE III

                  Confidentiality; Intellectual Property Rights

     Section 3.01. (a) No Management Member shall at any time (whether during or
after such Management Member's service with the Company or its Subsidiaries) (i)
retain or use for the benefit, purposes or account of the Management Member or
any other Person; or (ii) disclose, divulge, reveal, communicate, share,
transfer or provide access to any Person outside the Company and its
Subsidiaries (other than its professional advisers who are bound by
confidentiality obligations), any non-public, proprietary or confidential
information (including trade secrets, know-how, research and development,
software, databases, inventions, processes, formulae, technology, designs and
other intellectual property, information concerning finances, investments,
profits, pricing, costs, products, services, vendors, customers, clients,
partners, investors, personnel, compensation, recruiting, training, advertising,
sales, marketing, promotions, government and regulatory activities and approval)
concerning the past, current or

                                      -10-

future business, activities and operations of the Company, its Subsidiaries or
Affiliates and/or any third party that has disclosed or provided any of same to
the Company on a confidential basis, including, without limitation, the
existence and terms of this Agreement ("Confidential Information") without the
prior authorization of the Company.

     (b) "Confidential Information" shall not include any information that is
(i) generally known to the industry or the public other than as a result of the
Management Member's breach of this covenant or any breach of other
confidentiality obligations by third parties; (ii) made legitimately available
to the Management Member by a third party without breach of any confidentiality
obligation; or (iii) required by law to be disclosed; provided that in
connection with sub-clause (iii), the Management Member shall give prompt
written notice to the Company of such requirement, disclose no more information
than is so required, and cooperate with any attempts by the Company to obtain a
protective order or similar treatment. This Section 3.01 shall not be construed
to preclude the Management Member from using his/her acquired knowledge,
experience and expertise gained during the term of Services in any subsequent
employment, provided that such use does not include the disclosure or other use
in any manner of Confidential Information.

     (c) Except as required by law or except in connection with any proposed
transfer in accordance with this Agreement or any transfer to a Management
Permitted Transferee, the Management Member will not disclose to anyone, other
than the Management Member's immediate family and legal or financial advisors,
the existence or contents of this Agreement.

     (d) Upon termination of the Management Member's Services with the Company
for any reason, the Management Member shall (i) cease and not thereafter
commence use of any Confidential Information or intellectual property (including
any patent, invention, copyright, trade secret, trademark, trade name, logo,
domain name or other source indicator) owned or used by the Company, its
Subsidiaries or Affiliates; (ii) immediately destroy, delete, or return to the
Company, at the Company's option, all originals and copies in any form or medium
(including memoranda, books, papers, plans, computer files, letters and other
data) in the Management Member's possession or control (including any of the
foregoing stored or located in the Management Member's office, home, laptop or
other computer, whether or not such computer is Company property) that contain
Confidential Information or otherwise relate to the business of the Company, its
Affiliates and Subsidiaries, except that the Management Member may retain only
those portions of any personal notes, notebooks and diaries that do not contain
any Confidential Information; and (iii) notify and fully cooperate with the
Company regarding the delivery or destruction of any other Confidential
Information of which the Management Member is or becomes aware.

     (e) Each Management Member who has participated or will participate in the
creation or development of any intellectual property in the course of such
individual's service to the Company or its Subsidiaries hereby (i) disclaims and
agrees to disclaim any rights with respect to such intellectual property, (ii)
agrees that the Company or a Subsidiary of the Company, as the case may be, is
or will be deemed to be the sole original owner/author of all

                                      -11-

such intellectual property and, (iii) if requested by the Company or a
Subsidiary of the Company, will execute an assignment or an agreement to assign
solely in favor of the Company or such Subsidiary or such predecessor in
interest, as applicable, all right, title and interest in all such intellectual
property.

                                   ARTICLE IV

                                   Definitions

     Section 4.01. "Act" shall mean the Delaware Limited Liability Company Act,
Delaware Code, Title 6, Sections 18-101, et seq., as in effect from time to
time.

     Section 4.02. "Affiliate" shall have the meaning ascribed thereto in Rule
12b-2 promulgated under the 1934 Act, as in effect on the date hereof.

     Section 4.03. "Applicable Law" means, with respect to any Person, any
statute, law, regulation, ordinance, rule, injunction, order, decree,
governmental approval, directive, requirement, or other governmental restriction
or any similar form of decision of, or determination by, or any interpretation
or administration of any of the foregoing by, any governmental authority,
applicable to such Person or its Subsidiaries or their respective assets.

     Section 4.04. "Board" shall mean the board of directors of the Company.

     Section 4.05. "Business Day" shall mean any day on which banks are required
to be open to conduct business in New York City.

     Section 4.06. "Cause", when used in connection with the termination of
Services of a Management Member, shall have the same meaning ascribed to such
term in any written agreement relating to Services or any severance agreement
then in effect between such Management Member and the Company or one of its
Subsidiaries or, if no such agreement containing a definition of "Cause" is then
in effect, shall mean a termination of Services of the Management Member by the
Company or any Subsidiary thereof due to (i) the commission by the Management
Member of an act of fraud or embezzlement, (ii) the indictment or conviction of
the Management Member for a felony or a crime involving moral turpitude or a
plea by the Management Member of guilty or nolo contendere involving such a
crime, (iii) the gross negligence, malfeasance or willful misconduct by the
Management Member in the performance of the Management Member's duties, (iv) the
violation by the Management Member of a written Company policy regarding
employment, including substance abuse, sexual harassment or discrimination, (v)
the willful failure of the Management Member to render services to the Company
or any of its Subsidiaries in accordance with the Management Member's Services
which failure amounts to a material neglect of the Management Member's duties to
the Company or any of its Subsidiaries (other than as a result of mental or
physical incapacity) (vi) the repeated failure of the Management Member to
comply with reasonable directives of the Board or the chief executive officer of
the Company consistent with the Management Member's duties or (vii) the material
breach by the Management Member of any of the provisions of any

                                      -12-

agreement between the Management Member, on the one hand, and the Company or a
Member or an Affiliate of the Company, on the other hand.

     Section 4.07. "Change of Control" shall mean the consummation of any
transaction (including any merger or consolidation) the result of which is that
any Person, other than a Sponsor Member or a Permitted Transferee of a Sponsor
Member, becomes the beneficial owner, directly or indirectly, of (i) more than
50% of the voting securities of the Company or its successor entity or (ii) all
or substantially all of the assets of the Company or its successor entity.

     Section 4.08. "Cost" shall mean, with respect to a Management Member's
Units, the price per unit paid by such Management Member (as proportionately
adjusted for all subsequent distributions of Units and other recapitalizations).

     Section 4.09. "Disability" shall mean the inability of a Management Member
to perform the essential functions of the Management Member's job, with or
without reasonable accommodation, by reason of a physical or mental infirmity,
for a continuous period of six months or for an aggregate of nine months in a
twenty-four month period. The period of six months shall be deemed continuous
unless such Management Member returns to work for at least 30 consecutive
business days during such period and performs during such period at the level
and competence that existed prior to the beginning of the six-month period.

     Section 4.10. "Fair Market Value" shall be the fair value of the Units
determined from time to time in good faith by the Board using its reasonable
business judgment. Following the initial public offering of equity securities of
the Company or the IPO Entity, Fair Market Value will be based on the public
trading price of such securities.

     Section 4.11. "Financing Default" shall mean an event which would
constitute (or with notice or lapse of time or both would constitute) an event
of default (which event of default has not been cured) under or would otherwise
violate or breach (i) any financing arrangement of the Company or any of its
Subsidiaries in effect as of the time of the aforementioned event, and any
extensions, renewals, refinancings or refundings thereof in whole or in part;
and (ii) any provision of the Company's or any of its Subsidiary's
constitutional documents.

     Section 4.12. "Investor Group" shall have the meaning set forth in the LLC
Agreement.

     Section 4.13. "IPO Entity" shall mean the issuer in a Qualified IPO.

     Section 4.14. "Issuer Common Stock" shall mean common stock of the same
class as that offered to the public by the IPO Entity in a Qualified IPO or any
securities into which such common stock is exchanged, converted or reclassified,
including pursuant to any merger, reorganization or reclassification.

     Section 4.15. "1933 Act" shall mean the Securities Act of 1933, as amended,
and the rules and regulations promulgated thereunder.

                                      -13-

     Section 4.16. "1934 Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder.

     Section 4.17. "Management Members" shall have the meaning set forth in the
introductory paragraph of this Agreement.

     Section 4.18. "Manager Permitted Transferee" shall mean, with respect to
any Management Member, (i) a transferee in a Transfer upon the death of such
Management Member to his/her executors, administrators, testamentary trustees,
legatees or beneficiaries (ii) subject to the LLC Agreement, only in connection
with a Transfer by such Management Member for estate planning purposes not made
within twelve months of any other such Transfer, a limited partnership, limited
liability company, trust or custodianship, the beneficiaries of which may
include only such Management Member, his/her spouse (or ex-spouse) or his/her
lineal descendants (including adopted), but only if, (x) in the case of clause
(i) and (ii), such Person becomes a party to, and is bound to the same extent as
the transferor by the terms of, this Agreement and (y) in the case of a Transfer
described in clause (ii), the Compensation Committee of the Board has given its
prior, written approval to such Transfer.

     Section 4.19. "Member" shall have the meaning set forth in the LLC
Agreement.

     Section 4.20. "Permitted Transferee" shall have the meaning set forth in
the LLC Agreement.

     Section 4.21. "Person" means an individual, a partnership, a corporation, a
limited liability company, an association, a joint stock company, a trust, a
joint venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

     Section 4.22. "Public Share FMV", per share of Issuer Common Stock, shall
mean the arithmetic mean of the high and low prices per share as reported on
such date on the composite tape of the principal national securities exchange on
which such shares are listed or admitted to trading, or, if no composite tape
exists for such national securities exchange on such date, then on the principal
national securities exchange on which such shares are listed or admitted to
trading, or, if the shares are not listed or admitted on a national securities
exchange, the arithmetic mean of the per share closing bid price and per share
closing asked price on such date as quoted on the National Association of
Securities Dealers Automated Quotation System (or such market in which such
prices are regularly quoted) (the "NASDAQ"), or, if no sale of shares shall have
been reported on such composite tape or such national securities exchange on
such date or quoted on the NASDAQ on such date, then the immediately preceding
date on which sales of the shares have been so reported or quoted shall be used
to calculate the Public Share FMV.

     Section 4.23. "Qualified IPO" shall have the meaning set forth in the
Registration Rights Agreement.

                                      -14-

     Section 4.24. "Registration Rights Agreement" shall mean that certain
Registration Rights Agreement, dated as of May 17, 2004, by and among the
Company and the Members, as it may be amended, supplemented or restated from
time to time.

     Section 4.25. "Sale Date" shall mean, with respect to any Unit, the date on
which such Unit was first purchased from the Company.

     Section 4.26. "Services" shall mean (i) a Management Member's employment if
the Management Member is an employee of the Company or any of its Affiliates,
(ii) a Management Member's services as a consultant, if the Management Member is
a consultant to the Company or any of its Affiliates and (iii) a Management
Member's services as a non-employee director, if the Management Member is a
non-employee member of the Board or the board of directors of an Affiliate;
provided however that unless otherwise determined by the Board or the
compensation committee of the Board, a change in a Management Member's status
from employee to non-employee (other than with respect to a director of the
Company or an Affiliate) shall constitute a termination of employment hereunder.

     Section 4.27. "Sponsor Members" shall have the meaning set forth in the LLC
Agreement

     Section 4.28. "Subsidiary" shall have the meaning set forth in the LLC
Agreement.

     Section 4.29. "Tag-Along Manager" shall have the meaning set forth in
Section 2.04(a).

     Section 4.30. "Tag-Along Notice" shall have the meaning set forth in
Section 2.04(a).

     Section 4.31. "Tag-Along Price" shall have the meaning set forth in Section
2.04(a).

     Section 4.32. "Tag-Along Purchaser" shall have the meaning set forth in
Section 2.04(a).

     Section 4.33. "Tag-Along Securities" shall have the meaning set forth in
Section 2.04(a).

     Section 4.34. "Termination Event" shall have the meaning set forth in
Section 2.02(a).

     Section 4.35. "Transfer" shall have the meaning set forth in Section
2.01(a).

     Section 4.36. "Units" shall have the meaning set forth in the recitals of
this Agreement.

                                      -15-

     Section 4.37. "Units Buyer" shall have the meaning set forth in Section
2.02(c).

                                   ARTICLE V
                                  MISCELLANEOUS

     Section 5.01. Assignment and Binding Effect. Neither the Company nor any
Management Member shall assign all or any part of this Agreement without the
prior written consent of the other and the consent of the Board. This Agreement
shall be binding upon and inure to the benefit of the successors and assigns of
the parties pursuant to this paragraph.

     Section 5.02. Conversion; Restructuring; Recapitalization; Reorganization.
(a) In connection with a Qualified IPO, pursuant to Section 4.06 of the LLC
Agreement, the Units may be converted at the discretion of the Board into
Reclassified Securities (as defined in the LLC Agreement) and it is contemplated
that the restrictions contained in this Agreement would in such case be
replicated in one or more management shareholders agreements governing the
Reclassified Securities to which the Management Members would become parties.

     (b) The Company may, at the discretion of the Board and in accordance with
applicable U.S. state and federal law (including the 1933 Act and the 1934 Act
and the rules promulgated thereunder), effect a reorganization,
reclassification, conversion, merger, recapitalization or restructuring (each, a
"Restructuring Event") pursuant to which the Members would become members or
shareholders of a new limited liability company or corporation and cease to be
Members of the Company or receive different securities of the Company. The
units, shares or other equity interests provided to each Management Member
pursuant to such Corporate Restructuring would provide each Management Member
with substantially similar economic and other rights and privileges as such
Management Member had as a Member of the Company prior to such Restructuring
Event and which are consistent with the rights and preferences attendant to the
Units held by the Management Members immediately prior to such Restructuring
Event. It is contemplated that the Management Members, the company formed by
such Restructuring Event and, in the discretion of the Sponsor Members, the
Sponsor Members, would enter a management members agreement or management
shareholders agreement, as the case may be, in conjunction with such
Restructuring Event, containing provisions substantially similar to the
provisions of this Agreement. The Management Members hereby agree to enter into
any such management members agreement or management shareholders agreement.

     Section 5.03. Third Party Beneficiaries. Each of the Sponsor Members shall
be considered a third party beneficiary of the representations, warranties and
agreements of the Management Members made in this Agreement, entitled to take
any action against any Management Member as if such Sponsor Member were the
Company hereunder.

     Section 5.04. Notices. Any notice, demand, request, waiver, or other
communication under this Agreement shall be in writing and shall be deemed to
have been given when personally delivered, one day after deposit with Federal
Express or similar overnight

                                      -16-

courier service or three days after being mailed by first class mail, return
receipt requested shall be deemed to have been given on the date mailed, and
shall be addressed as follows:

                          TO THE COMPANY:   Nalco LLC
                                            345 Park Avenue
                                            New York, NY 10154
                                            Attention: Chinh Chu
                                            Fax: (212) 583-5722

                                            Attention: Joshua J. Harris
                                            Fax: (212) 515-3288
                                            Attention: Sanjeev Mehra
                                            Fax: (212) 357-5505

                          With a copy to:   Simpson Thacher & Bartlett LLP
                                            425 Lexington Avenue
                                            New York, NY  10017
                                            Attention: Wilson S. Neely
                                            Fax: (212) 455-2502

                           And a copy to:   Wachtell, Lipton, Rosen & Katz
                                            51 West 52nd Street
                                            New York, NY 10019
                                            Attention: Daniel A. Neff
                                            Fax: (212) 403-2000

        TO ANY MANAGEMENT INVESTOR MEMBER   At the address set
                                            forth in the
                                            written records of
                                            the Company.

     Section 5.05. Governing Law. THIS AGREEMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH, AND GOVERNED BY, THE LAWS OF THE STATE OF DELAWARE WITHOUT
REGARD TO CONFLICTS OF LAWS PRINCIPLES WHICH WOULD RESULT IN THE APPLICATION OF
THE LAWS OF ANOTHER JURISDICTION.

     Section 5.06. Jurisdiction. The parties hereby irrevocably and
unconditionally consent to submit to the exclusive jurisdiction of the courts of
the State of Delaware for any actions, suits or proceedings arising out of or
relating to this agreement and the transactions contemplated hereby (and agree
not to commence any action, suit or proceeding relating thereto except in such
courts, and further agree that service of any process, summons, notice or
document by U.S. registered mail to its address set forth above shall be
effective service of process for any action, suit or proceeding brought against
such party in any such court). The parties hereby irrevocably and
unconditionally waive any objection to the laying of venue of any action, suit
or proceeding arising out of this Agreement or the transactions contemplated
hereby

                                      -17-

in the courts of the State of Delaware, and hereby further irrevocably and
unconditionally waive and agree not to plead or claim in any such court that any
such action, suit or proceeding brought in any such court has been brought in an
inconvenient forum.

     Section 5.07. Management Member's Services. Nothing contained in this
Agreement shall be deemed to obligate the Company or any Subsidiary to employ or
retain any Management Member in any capacity whatsoever or to prohibit or
restrict the Company (or any Subsidiary) from terminating the Services of the
Management Member at any time or for any reason whatsoever, with or without
Cause.

     Section 5.08. Entire Agreement. This Agreement, the LLC Agreement and the
Registration Rights Agreement set forth the entire understanding and agreement
of the parties hereto and supersede any and all other understandings, term
sheets, negotiations or agreements between the parties hereto relating to the
subject matter of this Agreement, the LLC Agreement and the Registration Rights
Agreement.

     Section 5.09. Counterparts. This Agreement may be executed in counterparts,
each of which shall be deemed an original, and all of which together shall
constitute a single agreement.

     Section 5.10. Severability. In the event that any one or more of the
provisions contained in this Agreement shall for any reason be held to be
invalid, illegal or unenforceable, the same shall not affect any other provision
of this Agreement, but this Agreement shall be construed in a manner which, as
nearly as possible, reflects the original intent of the parties.

     Section 5.11. Interpretation. Words used in the singular form in this
Agreement shall be deemed to import the plural, and vice versa, as the sense may
require. The table of contents and headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Whenever the words "include," "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."

     Section 5.12. Amendment. Any amendment to this Agreement shall only be
effective if evidenced by a written instrument signed by the Company; provided,
that any such amendment that is materially adverse to the economic interests of
a Management Member shall only be effective if such Management Member consents
thereto in writing.

     Section 5.13. Waiver. Any party hereto may (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in the representations and warranties contained
herein or in any document delivered pursuant hereto, and (iii) waive compliance
with any of the agreements or conditions contained herein. Any agreement on the
part of a party hereto to any such extension or waiver shall be valid only if
set forth in an instrument in writing signed by the party granting such waiver
but such waiver or failure to insist upon strict compliance with such
obligation, covenant, agreement

                                      -18-

or condition shall not operate as a waiver of, or estoppel with respect to, any
subsequent or future failure.

     Section 5.14. Further Assurances. Subject to the terms and conditions of
this Agreement, each of the parties hereto will use its reasonable efforts to
take, or cause to be taken, all actions, 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 provisions of this Agreement.

     Section 5.15. Sections, Exhibits, Schedules. References to a section are,
unless otherwise specified, to one of the sections of this Agreement and
references to an "Exhibit" or "Schedule" are, unless otherwise specified, to one
of the exhibits or schedules attached to this Agreement.

     Section 5.16. Specific Enforcement. The Management Members and the Company
acknowledge and agree that irreparable damage would occur in the event that any
of the provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached. It is accordingly agreed that the
parties shall be entitled to an injunction or injunctions to prevent breaches of
the provisions of this Agreement and to enforce specifically the terms and
provisions hereof, this being in addition to any other remedy to which they may
be entitled at law or in equity.

     Section 5.17. Successors. Manager Permitted Transferees are entitled to all
of the rights and subject to all of the obligations of the transferor hereunder
from whom they received their Interests regardless of whether the Agreement
elsewhere so expressly provides.

                                      -19-

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date set forth above.

NALCO LLC

By: /s/ Stephen N. Landsman
    ----------------------------------
    Name: Stephen N. Landsman

MANAGEMENT MEMBER

By: /s/ William H. Joyce
    ----------------------------------
    Name: William H. Joyce

                                      -20-

                                   Schedule A

                               Management Members

                                      -21-

                                                                       EXHIBIT A

                                CONTINGENT BONUS

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

Issuer:                                A Subsidiary of the Company

Bonus:                                 Bonus of up to the maximum amount
                                       specified in the Management Member's
                                       subscription agreement with the Company,
                                       subject to the contingencies set forth
                                       below

Contingency:                           Bonus will be paid to a Management Member
                                       following a Qualified IPO of a subsidiary
                                       of the Company (if a Qualified IPO occurs
                                       prior to June 1, 2005) if he or she is i)
                                       an employee of the Company or one of its
                                       subsidiaries on January 1, 2007 and ii)
                                       required to pay current income tax on
                                       compensation with respect to Class A
                                       Units prior to January 1, 2007 and not in
                                       connection with a sale of Class A Units,
                                       which bonus shall be equal to such
                                       current income tax, subject to the
                                       maximum set forth above

Eligibility:                           A Management Member will only be eligible
                                       for the bonus if for all tax reporting
                                       purposes the Management Member uses the
                                       Units valuation prepared by the Company's
                                       third party valuation firm in connection
                                       with the issuance of the Units

                                      -22-

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