Exhibit 3.21

                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION
                                       OF
                            TOTAL WASTE SYSTEMS, INC.


TO THE SECRETARY OF STATE OF THE STATE OF OKLAHOMA

      The undersigned, Oklahoma corporation, for the purpose of amending and
restating the Certificate of Incorporation filed on November 3, 1995, does
hereby certify:

1.    The name of the Corporation is Total Waste Systems, Inc.

2.    The address of the registered office in the State of Oklahoma is 4401
Sherburne Drive, Norman, Oklahoma  73072, and the registered agent is John B.
Todd.

3.    The name and mailing address of each incorporator is:

<Table>
<Caption>
                    Name                       Address
                    ----                       -------
                                    
      Stephen A. Zrenda, Jr.           1520 Bank One Tower
                                       100 North Broadway
                                       Oklahoma City, Oklahoma 73102
</Table>

4.    The purposes for which the Corporation is formed are as follows:

      A.    To engage in any lawful act or activity for which corporations
            may be organized under the general corporation law of Oklahoma as
            now existing or hereafter enacted;

      B.    To buy, sell, lease, assign, convey in trust, pledge, subdivide,
            exchange, improve, cultivate, develop, maintain, construct, mortgage
            or otherwise acquire, transfer or encumber, and generally deal in
            and with any real estate, improved or unimproved, as may be now or
            hereafter permitted by the Constitution and laws of the State of
            Oklahoma and wheresoever situated within or without the State of
            Oklahoma;

      C.    To engage in all aspects of natural energy exploration and
            development as principal, partner, joint venturer, limited partner,
            developer, operator, owner or otherwise, including without
            limitation the following:

            (1)   To operate to the full extent permitted by the laws of the
                  State of Oklahoma a drilling, service and supply company in
                  the State of Oklahoma or any place authorized;

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            (2)   To drill wells for the production of oil and gas for the
                  Corporation's own account and for others by contract, turnkey
                  or day work and conduct and perform oilfield services;

            (3)   To engage in the treatment, servicing and supervision of wells
                  for the production of water, oil, gas, casinghead gas,
                  uranium, sulphur, and other mineral or hydrocarbon substances;

            (4)   To engage in the consultation and evaluation of water, oil,
                  gas, casinghead gas, uranium, sulphur and other mineral or
                  hydrocarbon substances; to engage in the supervision of
                  drilling, completion and recompletion operations of wells for
                  the primary and secondary production of water, oil, gas,
                  casinghead gas, uranium, sulphur, and other mineral or
                  hydrocarbon substances;

            (5)   To manufacture, buy or sell acids, solvents, cleaning fluids,
                  explosives, and other chemicals and substances which are used
                  in the drilling, treatment and servicing of wells for the
                  production of water, oil, gas, casinghead gas, uranium,
                  sulphur, and other mineral or hydrocarbon substances;

            (6)   To manufacture, buy or sell equipment used for introducing
                  into wells any such acids, solvents, cleaning fluids,
                  explosives, and other chemicals for the treatment and
                  servicing of wells;

            (7)   To buy, sell or lease interests in land for the purpose of
                  exploring for and producing water, oil, gas, casinghead gas,
                  uranium, sulphur and other mineral or hydrocarbon substances;
                  to engage in operations for the exploration, drilling and
                  development of such land; to construct pipelines and engage in
                  any other activities necessary for the transportation and
                  marketing of water, oil, casinghead gas, uranium, sulphur and
                  other mineral or hydrocarbon substances; to engage in all
                  activities necessary for the sale and disposal of such
                  substances, including the establishment of wholesale and
                  retail outlets;

            (8)   To engage in the treatment and servicing, by chemical or
                  mechanical means, of boilers, pipelines, machines, wells,
                  gathering tanks, and other mechanical equipment or apparatus
                  used for the production of water, oil, gas, casinghead gas,
                  uranium, sulphur and other mineral or hydrocarbon substances;

            (9)   To manufacture, buy or sell equipment for use in the treatment
                  and servicing, by chemical or mechanical means, of boilers,
                  pipelines, wells, gathering tanks, and other mechanical
                  equipment or apparatus used for the production of water, oil,
                  gas, casinghead gas, uranium, sulphur and other mineral or
                  hydrocarbon substances; and

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            (10)  To engage in research, exploration, laboratory and development
                  work relating to any substance, compound, mixture, chemical,
                  explosive, acid or solvent, and any process, machine, or
                  equipment which is used or produced in the drilling of water,
                  oil, gas, casinghead gas, uranium, sulphur and other mineral
                  or hydrocarbon substances;

      D.    To buy, sell, own and exploit letters patent, licenses under letters
            patent, processes of manufacture, secret or otherwise, copyrights,
            trademarks, and tradenames and to grant licenses or sublicenses
            thereunder for any and all lawful considerations, and to hold, own,
            use and sell rights under such patents, licenses, copyrights,
            trademarks, and tradenames or processes, or products produced
            pursuant to the disclosure thereof;

      E.    To build, construct, equip, own, control, lease, or otherwise
            acquire, and operate all kinds and classes of real and personal
            property wheresoever situated within or without the State of
            Oklahoma;

      F.    To acquire by lease, gift or purchase, sell, assign, exchange,
            convey in trust and pledge all types of transportation equipment
            necessary for or incident to the transportation and delivery of
            products and merchandise offered for sale by the Corporation, and
            to apply for, receive and hold licenses and certificates of
            convenience and necessity for the operation of transportation
            facilities for the transportation of the products and merchandise
            of the Corporation, for its own benefit or for the account of its
            customers or principals;

      G.    To borrow money with or without evidencing the same with bonds,
            notes or other evidence of indebtedness, with or without securing
            the same, and with power to execute mortgages, or deeds of trust,
            and instruments to secure indebtedness, to loan money upon such
            security as the Corporation might desire, and to make all
            necessary contracts either to borrow or to loan money and to
            secure or take security for the same as the Corporation might
            desire;

      H.    To subscribe or cause to be subscribed, acquire, hold, encumber,
            sell or otherwise dispose of or deal in shares of the capital
            stock, bonds, debentures, notes or other securities or evidence
            of indebtedness of this Corporation and any other person,
            corporation, association, trust or other entity, whether domestic
            or foreign, whether now or hereafter organized and to exercise
            all the rights, powers and privileges of ownership, and to deal
            in stocks and securities either as an agent or broker or
            otherwise;

      I.    To promote or to aid in any manner, financially or otherwise, any
            person, corporation, association, trust or other entity of which
            any stocks, bonds or other evidence of indebtedness or securities
            are held directly or indirectly by the Corporation; and to
            guarantee the contracts, dividends, stocks, bonds, notes and
            other obligations of such other persons, corporations,
            associations, trusts or other entities and to do any other acts
            or things designed to protect, preserve, improve

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            or enhance the value of such stocks, bonds or other evidence of
            indebtedness or securities;

      J.    To buy, sell, lease, exchange, develop, mortgage or otherwise
            acquire, transfer or encumber any interests in minerals, and to
            manage, control and exploit mineral interests and collect the
            revenue arising therefrom;

      K.    To exercise any of the powers, hereinbefore or hereinafter set
            forth, in conjunction with others, in the capacity of principal,
            agent, partner, stockholder, or holder of any interest in shares of
            stock, joint venturer or as a member of a partnership, syndicate or
            pool, for the Corporation or others; and

      L.    To do all things necessary or convenient for the accomplishment of
            any of the foregoing purposes, and to have and exercise all powers
            conferred by the laws of Oklahoma upon corporations, as such laws
            are now in effect or may at any time hereafter be amended.

5.    The number of shares which the Corporation shall have authority to issue
is Thirty-Four Million (34,000,000) shares. The designation of each class, the
number of shares for each class, and the par value of the shares of each class
are as follows:

<Table>
<Caption>
       CLASS            NO. OF SHARES         PAR VALUE          TOTAL VALUE
       -----            -------------         ---------          -----------

                                                        
(a) Voting                 7,000,000            $0.001            $7,000.00
Common

(b) Non-Voting            27,000,000            $0.001           $27,000.00.
Common
</Table>

Shares of stock which the Corporation is authorized to issue may be issued
and treasury stock may be transferred for such consideration as the directors
of the Corporation (the "Directors") shall determine.  The preferences,
qualifications, limitations, restrictions and the special or relative rights
of the shares of stock of this Corporation are as follows:

      A.    All voting rights shall be vested exclusively in the holders of the
            issued and outstanding voting common shares, the right to increase
            or decrease the authorized shares of any class or classes, together
            with the right to vote on the sale of all or substantially all of
            the assets of the Corporation, together with all other voting
            rights, being specifically reserved to the holders of the issued and
            outstanding voting common shares.

      B.    The holders of the issued and outstanding non-voting common shares
            shall have and possess no voting rights whatsoever, except as may be
            otherwise provided by law. The non-voting common shares may be
            redeemed by the Corporation on resolution of the Directors, either
            in whole or in part at par value, as determined in the sole
            discretion of the Directors.

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6.    The Directors are hereby granted full authority to cause the
Corporation to issue one or more classes of stock or one or more series of
stock within any class thereof, any or all of which classes may be of stock
with par value or stock without par value and which classes or series may
have such voting powers, full or limited or no voting powers, and such
designations, preferences and relative, participating optional or other
special rights, and qualifications, limitations or restrictions thereof as
shall be stated and expressed in a resolution or resolutions of the Directors.

7.    The following provisions for the regulation of the internal affairs of
the Corporation are hereby adopted:

      A.    The Bylaws for the governing of the Corporation may be adopted,
            amended, altered, repealed or readopted by the Directors at any
            regular or special meeting of the Directors, but the powers of
            the Directors will at all times be subject to the right of the
            shareholders to adopt, amend or repeal the Bylaws at any annual
            or special meeting of shareholders, and the power of the
            Directors will not extend to any amendment of the Bylaws
            respecting the number, qualifications or term of office of the
            Directors.

      B.    A quorum of Directors necessary for conducting business shall
            never be less than a majority of the Directors holding office.

      C.    A vote of the shareholders of the Corporation as a constituent
            corporation surviving a merger shall be required to authorize a
            merger notwithstanding the fact that the merger meets the
            conditions of 18 Okla. Stat. Section 1081 F.

      D.    The number of authorized shares of any class or classes of stock
            may, by amendment to the Corporation's Certificate of
            Incorporation, be increased or decreased but not below the number
            of shares of such class or classes then outstanding, by the
            affirmative vote of the holders of a majority of the stock of the
            Corporation entitled to vote, irrespective of the provisions of
            18 Okla. Stat. Section 1077 B. 2.

      E.    On the request of any person who believes he is entitled to
            indemnification pursuant to the provisions of 18 Okla. Stat.
            Section 1031 A. or B., the Directors will by vote at a special
            meeting, immediately called for such purpose, determine whether
            such person has met the standards of conduct set forth in 18
            Okla. Stat. Section 1031 A. or B., whichever is applicable,
            subject to the provisions of 18 Okla. Stat. Section 1031 D.1. and
            2., and if so provide for such indemnification.

      F.    Whenever a compromise or arrangement is proposed between this
            Corporation and its creditors or any class of them and/or between
            this Corporation and its shareholders or any class of them, any
            court of equitable jurisdiction within the State of Oklahoma, on
            the application in a summary way of this Corporation or of any
            creditor or shareholder thereof or on the application of any
            receiver or receivers appointed for this Corporation under the
            provisions of Section 1106 of

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            the Oklahoma Business Corporation Act (the "Act") or on the
            application of trustees in dissolution or of any receiver or
            receivers appointed for this Corporation under the provisions of
            Section 1100 of the Act, may order a meeting of the creditors or
            class of creditors, and/or of the shareholders or class of
            shareholders of this Corporation, as the case may be, to be
            summoned in such manner as the court directs. If a majority in
            number representing three-fourths (3/4ths) in value of the
            creditors or class of creditors, and/or of the shareholders or
            class of shareholders of this Corporation, as the case may be,
            agree to any compromise or arrangement and to any reorganization
            of this Corporation as a consequence of such compromise or
            arrangement, the compromise or arrangement and the
            reorganization, if sanctioned by the court to which the
            application has been made, shall be binding on all the creditors
            or class of creditors, and/or on all the shareholders or class
            of shareholders, of this Corporation, as the case may be, and
            also on this Corporation.

      G.    Appraisal rights, as provided for in the Act, including 18 Okla.
            Stat. Section 1091, shall be available for the shares of any
            class or series of the Corporation's stock as a result of:

            (i)   any merger or consolidation in which the Corporation is a
                  constituent corporation; and

            (ii)  the sale of all or substantially all of the assets of the
                  Corporation.

8.    At a meeting of the Shareholders a resolution was duly adopted setting
forth the foregoing proposed amendments to the Certificate of Incorporation
of the Corporation, declaring the amendments to be advisable and calling a
meeting of the Board of Directors of the Corporation for consideration.
Thereafter, pursuant to the resolution of its Shareholders, a meeting of the
Board of Directors of the Corporation was duly held, at which meeting the
necessary resolution was duly adopted in favor of the amendments.

      IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
signed by its President and attested by its Assistant Secretary, this 24th
day of October, 2000.

                                      /s/  John B. Todd
                                     --------------------------------
                                     John B. Todd, President

ATTEST:



 /s/  Stacy Axtman
- --------------------------------------
Stacy Axtman, Assistant Secretary
        (SEAL)

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