WHEELABRATOR TECHNOLOGIES INC /DE/
8-K, 1996-12-16
COGENERATION SERVICES & SMALL POWER PRODUCERS
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<PAGE>
 
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

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


                                    FORM 8-K


                                 CURRENT REPORT


                       PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934



                                DECEMBER 2, 1996
                DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED)



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



                         WHEELABRATOR TECHNOLOGIES INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                                   DELAWARE
                 (STATE OR OTHER JURISDICTION OF INCORPORATION)


        0-14246                                        22-2678047
 (COMMISSION FILE NUMBER)                            (IRS EMPLOYER
                                                  IDENTIFICATION NO.)

              4 LIBERTY LANE WEST, HAMPTON, NEW HAMPSHIRE               03842
                (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)             (ZIP CODE)


                                (603) 929-3000
              (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)
================================================================================
<PAGE>
 
Item 2. Acquisition or Disposition of Assets.


     On December 2, 1996, the registrant completed the disposition to United
States Filter Corporation ("U.S. Filter") of its industrial water process,
manufacturing and custom-engineered systems businesses (the "Businesses") for
$369.6 million in cash. The purchase price was negotiated between the two
parties. The registrant and U.S. Filter entered into an amended purchase and
sale agreement, dated as of September 14, 1996 and an agreement and amendment,
dated as of December 2, 1996, both of which are attached hereto as Exhibits 2.1
and 2.2, respectively. In conjunction with the sale, the parties also entered
into a Business Development Agreement (see footnote (d) to the condensed
consolidated balance sheet contained in Item 7(b)(i) herein). The businesses
that were sold provide a broad range of water and wastewater engineering,
technology and systems, including Wheelabrator's HPD, CPC Engineering, Johnson
Screens, Wiesemann, Memtek, Westates Carbon, The Wheelabrator Corporation and
Custom Engineered Systems businesses located in the United States, as well as
Rossmark in The Netherlands, Darchet Engineering in Singapore, Sun Chi in Taiwan
and additional subsidiaries in Australia, England, France, Japan, Germany and
Spain.

Item 7.   Financial Statements, Pro Forma and Financial Information and
          Exhibits.

(a)  Not applicable

(b)  Pro Forma Financial Information

          The following pro forma financial information is filed with this
          report:

          (i)    Wheelabrator Technologies Inc. and Subsidiaries Condensed
          Consolidated Balance Sheet and associated notes as of September 30,
          1996 (Unaudited).

          (ii)   Wheelabrator Technologies Inc. and Subsidiaries Condensed
          Consolidated Statement of Income and associated notes for the nine
          months ended September 30, 1996 (Unaudited).

          (iii)  Wheelabrator Technologies Inc. and Subsidiaries Condensed
          Consolidated Statement of Income and associated notes for the year
          ended December 31, 1995 (Unaudited).

                                       2
<PAGE>

The unaudited pro forma condensed consolidated financial statements presented
herein are shown for illustrative purposes only and are not necessarily
indicative of the financial position or results of operations of the Company
that would have actually resulted had the transaction or share repurchases
occurred as of the date or for the periods presented, or that may result in the
future.

The unaudited Pro Forma Condensed Consolidated Balance Sheet of the Company as
of September 30, 1996, reflects the financial position of the Company after
giving effect to the sale of the Company's industrial water process and
manufacturing businesses, as discussed in Item 2, and assumes the disposition
took place on September 30, 1996. The unaudited Pro Forma Condensed Consolidated
Statements of Income for the year ended December 31, 1995, and the nine months
ended September 30, 1996, assume that the disposition occurred at the beginning
of the period presented, and are based on the operations of the Company for the
year ended December 31, 1995, and the nine months ended September 30, 1996. Such
pro forma statements also reflect use of the sale proceeds to effect ratable
share repurchases over the reporting periods.

The unaudited pro forma condensed consolidated financial statements should be
read in conjuction with the historical financial statements and related notes of
the Company for the year ended December 31, 1995, as filed on Form 10-K, and for
the nine months ended September 30, 1996, as filed on Form 10-Q.

                                       3
<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
                PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                              SEPTEMBER 30, 1996
                                (000s omitted)
                                  (unaudited)
<TABLE>
<CAPTION>
 
                                                        Disposed
                                          Historical   Businesses(a)   Adjustments     Pro Forma
                                          -----------  -------------  --------------  -----------
<S>                                       <C>          <C>            <C>             <C>
 
Current assets                            $  392,464     $ (171,404)    $ 300,000(b)  $  521,060
Property, plant and equipment, net         1,613,692        (55,752)            -      1,557,940
Investments in affiliates                    644,046         (1,021)            -        643,025
Other assets                                 543,256       (158,601)            -        384,655
                                          ----------     ----------     ---------     ----------
  Total assets                            $3,193,458     $ (386,778)    $ 300,000     $3,106,680
                                          ==========     ==========     =========     ==========
 
Current liabilities                       $  419,976     $ (113,409)    $  14,000(c)  $  320,567
Long-term debt                               751,441           (448)            -        750,993
Deferred income taxes                        426,108           (754)            -        425,354
Other liabilities                            319,877        (12,760)       28,675(d)     335,792
                                          ----------     ----------     ---------     ----------
   Total liabilities                       1,917,402       (127,371)       42,675      1,832,706
                                          ----------     ----------     ---------     ----------
 
Capital in excess of par value               875,488       (230,767)      230,767        875,488
Treasury stock                              (438,011)            -              -       (438,011)
Retained earnings                            846,012        (25,421)       25,421        846,012
Other stockholders' equity                    (7,433)        (3,219)        1,137         (9,515)
                                          ----------     ----------     ---------     ----------
   Total stockholders' equity              1,276,056       (259,407)      257,325      1,273,974
                                          ----------     ----------     ---------     ----------
   Total liabilities and stockholders'
      equity                              $3,193,458     $ (386,778)    $ 300,000     $3,106,680
                                          ==========     ==========     =========     ==========
 
</TABLE>
  See accompanying notes to unaudited pro forma condensed consolidated balance
  sheet.

                                       4

<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
            NOTES TO PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                           AS OF SEPTEMBER 30, 1996
                                  (unaudited)

 
 
a)   Represents the historical unaudited September 30, 1996, balances for the
     Businesses which are eliminated to reflect the sale to U.S. Filter.
 
b)   Cash proceeds resulting from the sale of the Businesses, net of the        
     estimated tax liability.
 
c)   Current liabilities and direct costs associated with the sale including $5 
     million pursuant to the Business Development Agreement (see below).
                                     
d)   Retained or estimated liabilities associated with the sale, including $20
     million pursuant to the Business Development Agreement. The Business
     Development Agreement was entered into in conjunction with the sale. In
     accordance with the agreement, Wheelabrator will pay U.S. Filter $5 million
     each year through 2001. In return, U.S. Filter will promote the use of
     municipal biosolids, energy plant services and waste-to-energy development
     opportunities of Wheelabrator at the facilities of U.S. Filter's customers
     and to U.S. Filter's customer base.
     
                                       5
<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
             PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                 FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1996
                     (000s omitted, except per share data)
                                  (unaudited)
<TABLE>
<CAPTION>
 
                                                                       Disposed
                                                       Historical     Businesses (a)   Adjustments   Pro Forma
                                                       ----------     --------------   -----------   ---------
<S>                                                   <C>             <C>             <C>                 <C>
 
Revenue                                                $1,064,602      $(329,527)     $    -         $735,075

Operating expenses                                        738,855       (257,967)          -          480,888
Selling and administrative expenses                        92,534        (51,695)          -           40,839
Interest expense                                           43,134           (493)          -           42,641
Equity in earnings of affiliates                          (20,861)           (32)          -          (20,893)
Other, net                                                 (5,452)         1,103      (6,188)(b)      (10,537)
                                                       ----------      ---------      ------         --------
  Income before income taxes                              216,392        (20,443)      6,188          202,137
Income tax provision                                       77,946         (8,177)      2,475           72,244
                                                       ----------      ---------      ------         --------
  Income from continuing operations                    $  138,446      $ (12,266)     $3,713         $129,893
                                                       ==========      =========      ======         ========
 
Weighted average common and
  common equivalent shares
  outstanding                                             171,500                                     164,311(b)
                                                       ==========                                    ========
 
Earnings per common and common
  equivalent shares from continuing
  operations                                           $     0.81                                    $   0.79
                                                       ==========                                    ========
 
</TABLE>



See accompanying notes to unaudited pro forma condensed consolidated statement
of income.

                                       6
<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
          NOTES TO PRO FORMA CONDENSED CONSOLIDATED INCOME STATEMENT
                 FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1996
                                  (unaudited)



a)   To reflect elimination of the sales and directly allocable expenses related
     to the Businesses.

b)   To reflect a ratable repurchase of stock over the pro forma period, with
     sale proceeds earning interest until used to buy back stock.

                                       7
<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
              PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1995
                     (000s omitted, except per share data)
                                  (unaudited)
<TABLE>
<CAPTION>
 
                                                     Disposed
                                       Historical   Businesses(a)    Adjustments    Pro Forma
                                       ----------   ------------     -----------    --------- 
<S>                                    <C>          <C>            <C>              <C>
 
Revenue                                $1,451,675      $(452,134)      $     -       $999,541

Operating expenses                      1,015,269       (357,250)            -        658,019
Selling and administrative expenses       130,976        (71,120)            -         59,856
Interest expense                           60,726           (700)            -         60,026
Equity in earnings of affiliates           (4,998)            19             -         (4,979)
Other, net                                (13,735)           786        (8,250)(b)    (21,199)
                                       ----------      ---------       -------       --------
  Income before income taxes              263,437        (23,869)        8,250        247,818
Income tax provision                      101,288         (9,548)        3,300         95,040
                                       ----------      ---------       -------       --------
  Income from continuing operations    $  162,149      $ (14,321)      $ 4,950       $152,778
                                       ==========      =========       =======       ========
 
Weighted average common and
 common equivalent shares
 outstanding                              185,000                                     174,967(b)
                                       ==========                                    ========
 
Earnings per common and common
 equivalent shares from continuing
 operations                            $     0.88                                    $   0.87
                                       ==========                                    ========
 
</TABLE>



See accompanying notes to unaudited pro forma condensed consolidated statement
of income.

                                       8
<PAGE>
 
                WHEELABRATOR TECHNOLOGIES INC. AND SUBSIDIARIES
           NOTES TO PRO FORMA CONDENSED CONSOLIDATED INCOME STATEMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1995
                                  (unaudited)



a)   To reflect elimination of the sales and directly allocable expenses related
     to the Businesses.

b)   To reflect a ratable repurchase of stock over the pro forma period, with
     sale proceeds earning interest until used to buy back stock.

                                       9
<PAGE>
 
(c)  Exhibits
      The exhibits filed as a part of this report are listed in the Exhibit
Index hereto.

                                      10
<PAGE>

                                 SIGNATURES

          Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                    WHEELABRATOR TECHNOLOGIES INC.

                                    By: /s/ John D. Sanford
                                        -------------------------------
                                        John D. Sanford
                                        Executive Vice President

Dated:  December 16, 1996

                                      11
<PAGE>
 
                        WHEELABRATOR TECHNOLOGIES INC.

                                 EXHIBIT INDEX


Number and Description of Exhibit*
- ----------------------------------
1.   None
2.1  Amended and Restated Purchase and Sale Agreement between the registrant and
     United States Filter Corporation, dated as of September 14, 1996
2.2  Agreement and Amendment between the registrant and United States Filter
     Corporation, dated as of December 2, 1996
4.   None
16.  None
17.  None
20.  None
23.  None
24.  None
27.  None



_________________________
 * Exhibits not listed are inapplicable



                                      12

<PAGE>
 
                                                                     EXHIBIT 2.1


                                                                  EXECUTION COPY



                             AMENDED AND RESTATED
                          PURCHASE AND SALE AGREEMENT


                                    between


                        WHEELABRATOR TECHNOLOGIES INC.
                                  ("SELLER")


                                      and


                       UNITED STATES FILTER CORPORATION
                                 ("PURCHASER")



                              September 14, 1996
<PAGE>

<TABLE>
<CAPTION>



                               TABLE OF CONTENTS

                                   ARTICLE I

                                  DEFINITIONS

                                                                 Page
                                                                 ----
    <S>   <C>                                                   <C> 
     1.1   Defined Terms.........................................  1

                                   ARTICLE II

                               PURCHASE AND SALE

     2.1   Purchase and Sale of Shares and Domestic Assets....... 10
     2.2   Payment at Closing.................................... 13
     2.3   Closing Balance Sheet................................. 14
     2.4   Procedures for Assets not Transferable................ 15

                                  ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF SELLER

     3.1   Authority of Seller................................... 16
     3.2   Shares and Subsidiaries............................... 17
     3.3   Real Property......................................... 18
     3.4   Leases................................................ 18
     3.5   Intellectual Property................................. 18
     3.6   Title to Assets....................................... 19
     3.7   No Adverse Change..................................... 19
     3.8   Tax Matters........................................... 20
     3.9   Litigation............................................ 20
     3.10  ERISA................................................. 20
     3.11  Material Contracts.................................... 22
     3.12  Brokers............................................... 23
     3.13  Environmental......................................... 23
     3.14  Qualification......................................... 25
     3.15  Compliance with Law; Regulatory Compliance............ 25
     3.16  Financial Statements.................................. 26
     3.17  Indebtedness; Parent Guarantees....................... 26
     3.18  Employment............................................ 27
     3.19  Labor Relations....................................... 27
     3.20  Inventory............................................. 27
     3.21  Receivables........................................... 27
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION> 

                                  ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF PURCHASER
    <S>                                                          <C>
     4.1   Authority of Purchaser................................ 28
     4.2   Brokers............................................... 29
     4.3   Securities............................................ 29
     4.4   Financing............................................. 29

                                   ARTICLE V

                              COVENANTS OF SELLER

     5.1   Corporate and Other Actions........................... 30
     5.2   Full Access........................................... 30
     5.3   Ordinary Course of Business........................... 30
     5.4   Payment of Taxes...................................... 31
     5.5   HSR Filings........................................... 32
     5.6   Litigation Support and Access After Closing........... 32
     5.7   No Solicitation....................................... 32
     5.8   Employee Solicitation................................. 33
     5.9   Failure to Close...................................... 33
     5.10  Filings............................................... 33
     5.11  Insurance............................................. 33

                                  ARTICLE VI

                            COVENANTS OF PURCHASER

     6.1   Corporate and Other Actions........................... 34
     6.2   Confidentiality....................................... 34
     6.3   Employees; Benefit Plans.............................. 34
     6.4   Full Access........................................... 35
     6.5   Insurance............................................. 35
     6.6   Use of Name........................................... 35
     6.7   HSR Filings........................................... 36
     6.8   Litigation Support and Access After Closing........... 36
     6.9   Parent Guarantees..................................... 36
     6.10  Knowledge............................................. 36

                                  ARTICLE VII

                      CONDITIONS PRECEDENT TO OBLIGATIONS
</TABLE>

                                     -ii-
<PAGE>
 
<TABLE>
<S>                                                            <C>
                                 OF PURCHASER

     7.1   Warranties True....................................... 36
     7.2   Compliance with Agreements and Covenants.............. 37
     7.3   HSR Act............................................... 37
     7.4   Injunctions........................................... 37
     7.5   Deliveries by Seller.................................. 37
     7.6   No Material Adverse Change............................ 37
     7.7   Materiality Standard.................................. 37

                                 ARTICLE VIII

                 CONDITIONS PRECEDENT TO OBLIGATIONS OF SELLER

     8.1   Warranties True....................................... 37
     8.2   Compliance with Agreements and Covenants.............. 38
     8.3   HSR Act............................................... 38
     8.4   Injunctions........................................... 38
     8.5   Deliveries by Purchaser............................... 38

                                  ARTICLE IX

                                    CLOSING

     9.1   Closing............................................... 38
     9.2   Seller's Deliveries................................... 38
     9.3   Purchaser's Deliveries................................ 39
     9.4   Termination........................................... 40

                                   ARTICLE X

                         SURVIVAL AND INDEMNIFICATION

     10.1  Survival.............................................. 41
     10.2  Indemnification by Seller............................. 41
     10.3  Limitations........................................... 42
     10.4  Indemnification by Purchaser.......................... 43
     10.5  Procedures............................................ 43
     10.6  Calculations.......................................... 43

                                  ARTICLE XI

                                     TAXES
</TABLE>

                                     -iii-
<PAGE>

<TABLE>
    <S>    <C>                                                    <C> 
     11.1   Filing Tax Returns; Payment of Taxes.................. 44
     11.2   Tax Benefits.......................................... 44
     11.3   Tax Cooperation....................................... 45
     11.4   Section 338(h)(1) Election............................ 45
     11.5   Tax Sharing Arrangements.............................. 46

                                  ARTICLE XII

                                 MISCELLANEOUS

     12.1   Expenses.............................................. 46
     12.2   Amendment............................................. 46
     12.3   Notices............................................... 46
     12.4   Waivers............................................... 47
     12.5   Counterparts.......................................... 47
     12.6   Headings.............................................. 47
     12.7   Applicable Law........................................ 47
     12.8   Assignment............................................ 47
     12.9   No Third Party Beneficiaries.......................... 48
     12.10  Arbitration........................................... 48
     12.11  Schedules............................................. 48
     12.12  Incorporation......................................... 48
     12.13  Knowledge Defined..................................... 48
     12.14  Public Announcements.................................. 49
     12.15  Complete Agreement.................................... 49
     12.16  Interpretation........................................ 49
     12.17  Further Assurances.................................... 49
</TABLE>

                                     -iv-

<PAGE>
 
Schedule 1.2                    -  Minority Subsidiaries
Schedule 1.3                    -  The Shares
Schedule 1.4                    -  Subsidiaries
Schedule 2.1(b)                 -  Certain Retained Matters
Schedule 2.1(c)(I)              -  Environmental Liabilities
Schedule 2.1(c)(II)             -  Retained Claims
Schedule 2.1(c)(III)            -  Certain Litigation
Schedule 2.1(d)                 -  Transferred Assets
Schedule 2.2                    -  Payment Allocation
Schedule 2.3                    -  Accounting Conventions
Schedule 3.1                    -  Authority of Seller
Schedule 3.2                    -  Ownership
Schedule 3.3                    -  Real Property
Schedule 3.4                    -  Leases
Schedule 3.5                    -  Intellectual Property
Schedule 3.6                    -  Title to Assets
Schedule 3.7                    -  No Adverse Change
Schedule 3.8                    -  Tax Matters
Schedule 3.9                    -  Litigation
Schedule 3.10                   -  ERISA
Schedule 3.11                   -  Material Contracts
Schedule 3.13                   -  Environmental
Schedule 3.15                   -  Compliance
Schedule 3.16                   -  Financial Statements
Schedule 3.17                   -  Indebtedness
Schedule 3.18                   -  Employment
Schedule 3.19                   -  Labor Relations
Schedule 5.3(I)                 -  Capital Expenditures
Schedule 6.3(e)                 -  Excluded Employees
Schedule 12.13(a)               -  Knowledge of Seller
Schedule 12.13(b)               -  Knowledge of Purchaser
                             
                             
Exhibit A                       -  Insurance Agreement
Exhibit B                       -  Stock Retention Agreement
Exhibit C                       -  Trade Name and Service Mark License Agreement
Exhibit D                       -  Business Development Agreement
Exhibit E                       -  Non-Competition Agreement

                                      -v-
<PAGE>
 
                             AMENDED AND RESTATED
                          PURCHASE AND SALE AGREEMENT
                          ---------------------------


     THIS AMENDED AND RESTATED PURCHASE AND SALE AGREEMENT is entered into as of
the 14th day of September, 1996, between Wheelabrator Technologies Inc., a
Delaware corporation ("SELLER"), and United States Filter Corporation, a
Delaware corporation ("PURCHASER").

     WHEREAS, subject to the terms and conditions set forth herein, Seller
desires to cause the sale, assignment and transfer to Purchaser, and Purchaser
desires to purchase, assume and take assignment and delivery of, (A) the stock
of certain of Seller's indirect subsidiaries and certain other entities, and (B)
substantially all of the assets and liabilities of the Johnson Screens,
Wheelabrator Corporation and Water Process divisions of Seller's wholly owned
subsidiary, Wheelabrator Water Technologies Inc. ("WWTI"). Certain capitalized
terms used herein shall have the meanings ascribed to such terms below.

     WHEREAS, on September 14, 1996, the parties entered into a Purchase and
Sale Agreement providing for the foregoing, which Agreement the parties now wish
to amend in certain respects and restate in its entirety, which Amended and
Restated Purchase and Sale Agreement shall be deemed to be entered into as of
the 14th day of September, 1996.

     NOW, THEREFORE, in consideration of the premises and the mutual promises
herein contained, it is hereby agreed as follows:

                                   ARTICLE I

                                  DEFINITIONS

     1.1 Defined Terms. The following terms shall have the following meanings:

          "ACCOUNTING CONVENTIONS" shall mean the agreements, assumptions and
     conventions used in connection with preparing the Financial Statements and
     to be used in connection with preparing the Closing Balance Sheet, as set
     forth on Schedule 2.3.

          "ACQUISITION PROPOSAL" shall have the meaning set forth in Section
     5.7.

          "AFFILIATE" means any Person controlling, controlled by, or under
     common control with, another Person; for purposes of this definition (and
     for such purposes only), "control" shall mean the ownership, directly or
     indirectly, of 50% or more of the outstanding equity securities or
     ownership interests of a Person.
<PAGE>
 
          "AGREEMENT" means this Agreement, including all Schedules and Exhibits
     hereto, as it may be amended from time to time in accordance with its
     terms.

          "ALLOCATION" shall have the meaning set forth in Section 11.4.

          "BALANCE SHEET" means the unaudited combined balance sheet of the
     Business as of August 31, 1996.

          "BASE TANGIBLE NET BOOK VALUE" means (a) $110,600,000, if the Closing
     occurs on or as of October 31, 1996; (b) $113,600,000, if the Closing
     occurs on or as of November 30, 1996; or (c) $116,600,000, if the Closing
     occurs on or as of December 31, 1996.

          "BENEFIT PLANS" means written and unwritten "employee benefit plans"
     within the meaning of Section 3(3) of ERISA, and any other written and
     unwritten profit sharing, pension, savings, deferred compensation, fringe
     benefits, insurance, medical, medical reimbursement, life, disability,
     accident, post-retirement health or welfare benefit, stock option, stock
     purchase, sick pay, vacation, employment, severance, termination or other
     plan, agreement, contract, policy, trust fund or arrangement, whether or
     not funded, in each case only to the extent maintained in the United States
     by or for the benefit of the Divisions. The term "Benefit Plans" does not
     include plans maintained or required by governmental authorities.

          "BUSINESS" shall mean, collectively, the following: (a) the businesses
     of the Subsidiaries (after the transfer contemplated at Section 2.1(d)
     below); (b) the business of the Johnson Screens division of WWTI; (c) the
     business of the Wheelabrator Corporation division of WWTI; and (d) the
     businesses of the Water Process division of WWTI, including the HPD, CPC
     Engineering, Wiesemann, McCormick and Memtek business lines. "Business"
     does not include the Excluded Businesses.

          "CLOSING" shall mean the closing of the purchase and sale transactions
     contemplated by this Agreement.

          "CLOSING BALANCE SHEET" shall have the meaning set forth in Section
     2.3.

          "CLOSING DATE" shall have the meaning set forth in Section 9.1.

          "CODE" means the Internal Revenue Code of 1986, as amended.

          "CONTROLLED GROUP MEMBER" shall have the meaning set forth in Section
     3.10.

          "DEFAULT" means, with respect to any contract, lease or agreement, a
     breach of any obligation thereunder that would give the counterparty
     thereto (a) the right to

                                      -2-
<PAGE>
 
     terminate such contract, lease or agreement, (b) the right to accelerate
     all payments due under such contract, lease or agreement or (c) a bona fide
     claim for damages in excess of $250,000. "Default" shall not include claims
     under warranties or process guarantees.

          "DIVISIONS" means the Johnson Screens, Wheelabrator Corporation, and
     Water Process (including the HPD, CPC Engineering, Wiesemann and Memtek
     business lines) divisions of WWTI.

          "DOL" shall have the meaning set forth in Section 5.10.

          "DOMESTIC ASSETS" shall have the meaning set forth in Section 2.1(b).

          "EMPLOYMENT AGREEMENTS" shall have the meaning set forth in Section
     3.18.

          "ENVIRONMENTAL ACTION" shall mean any civil, criminal or
     administrative action, suit, summons, citation, complaint, claim, demand,
     judgment, order, Lien, notice of violation, proceeding or hearing, or
     investigation based upon or related to (i) any Environmental Law or
     Environmental Condition, or (ii) the presence, manufacture, generation,
     processing, distribution, use, sale, receipt, storage, disposal, transport,
     treatment, handling, Release or threatened Release of any Hazardous
     Material.

          "ENVIRONMENTAL APPROVALS" shall mean collectively all Governmental
     Approvals required under Environmental Laws.

          "ENVIRONMENTAL CONDITION" shall mean the presence of a Hazardous
     Material (other than a naturally occurring substance) on, at or in a
     property (including, but not limited to, the presence in surface water,
     groundwater, soils or subsurface strata).

          "ENVIRONMENTAL LAWS" means all applicable Federal, state,  local or
     foreign Laws relating primarily to pollution or protection of the
     environment, as such Laws exist on the Closing Date, including, without
     limitation, Laws relating to Releases of pollutants, contaminants,
     chemicals, or industrial, toxic or hazardous substances or wastes
     (including, without limitation, Hazardous Materials) into the indoor or
     outdoor environment (including, without limitation, ambient air, surface
     water, ground water or land), or otherwise relating primarily to the
     manufacture, use, treatment, storage, transportation or disposal of
     Hazardous Materials.

          "ENVIRONMENTAL LIABILITIES" mean the liabilities set forth on Schedule
     2.1(c)(I).

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended.

          "EXCLUDED ASSETS" shall have the meaning set forth in Section 2.1(b).

                                      
                                      -3-
<PAGE>
 
          "EXCLUDED BUSINESSES" means (a) those assets, liabilities and
     operations of Wheelabrator Clean Air Systems Inc. and Wheelabrator Canada
     Inc. to be transferred pursuant to Section 2.1(d) below and retained by
     Seller, (b) all of the BioGro line of business of WWTI, (c) the EOS line of
     business of WWTI, (d) the contracts, operations, and businesses and other
     assets included within the Excluded Assets and (e) the privatization and
     industrial outsourcing development group of WWTI.

          "FINANCIAL STATEMENTS" shall have the meaning set forth in Section
     3.16.

          "GAAP" means United States generally accepted accounting principles,
     as in effect on the date of this Agreement.

          "GOVERNMENTAL APPROVALS" shall have the meaning set forth in Section
     3.15(b).

          "GOVERNMENTAL FILINGS" means any plans, filings, reports,
     notifications, or other submissions required to be made to any governmental
     authority.

          "HAZARDOUS MATERIAL" means any substance which is defined as a
     hazardous substance, hazardous material, hazardous chemical, hazardous
     waste, toxic substance, pollutant, solid waste, municipal waste, industrial
     waste or contaminant under any Environmental Law, or any substance which is
     regulated under any Environmental Law, and including, without limitation,
     petroleum and related materials.

          "HSR ACT" means the Hart-Scott-Rodino Antitrust Improvements Act of
     1976, as amended.

          "INDEBTEDNESS" shall have the meaning set forth in Section 3.17.

          "INSURANCE AGREEMENT" shall mean the Insurance Agreement set forth on
     Exhibit A hereto.

          "INTELLECTUAL PROPERTY" means all domestic and foreign patents and
     registered and unregistered trade names, fictitious names, logos and brand
     names, copyrights, trademarks (and associated goodwill), processes,
     software, know-how, trade secrets, service marks and patents, and other
     proprietary rights, and licenses and applications for any of the foregoing,
     used exclusively by the Divisions or Subsidiaries in the operation of the
     Business or owned by any Subsidiary.

          "IRS" shall have the meaning set forth at Section 3.10.

          "LAW" means any law, statute, regulation, ordinance, rule, order,
     decree, judgment, consent decree, settlement agreement or governmental
     requirement (including, without limitation, common laws) enacted,
     promulgated, entered into, agreed to or

                                      -4-
<PAGE>
 
     imposed by any court or other governmental authority or body; provided,
     that the term "Law" shall not include any Environmental Law.

          "LIABILITIES" means all liabilities (excluding all Retained
     Liabilities) of, or arising from the operation of, the Subsidiaries, the
     Divisions, the Business and the Domestic Assets, whether absolute or
     contingent, known or unknown, including, without limitation:

               (a) all the obligations under any agreements, contracts, leases,
          instruments, purchase orders, sales orders, warranties, guaranties and
          commitments (including, without limitation, outstanding bids and
          contracts in process) to which any of Seller, WWTI (with respect to
          the Business) or the Subsidiaries are a party or otherwise bound
          (including, without limitation, matters relating to both open and
          completed contracts);

               (b) current liabilities, including such liabilities (i) reflected
          on the Balance Sheet to the extent not paid on the Closing Date or
          (ii) incurred in the ordinary course of business (or otherwise, with
          the written consent of Purchaser) after the date of the Balance Sheet;

               (c) all claims arising from products sold or services provided on
          or prior to the Closing Date, including, without limitation, warranty
          claims, process guaranty claims, property damage claims, and personal
          injury claims;

               (d) any claims by employees of the Business, including, without
          limitation, worker's compensation claims, disability claims, severance
          claims, retirement claims, claims for termination pay, vacation pay,
          profit sharing, thirteenth month or other statutory or non-statutory
          bonus, or any claim for violation of applicable Law pertaining to
          employment (provided, that it is understood that the parties'
          allocations of liabilities set forth in Section 6.3 with respect to
          the matters set forth therein shall be controlling);

               (e) all Taxes that have been accrued and are not payable and that
          accrue after the Closing Date;

               (f) any other liability, absolute, contingent, known or unknown,
          related to the assets, liabilities, operations or products of the
          Subsidiaries, the Divisions, the Business and the Domestic Assets.

          "LIEN" means any lien, security interest, mortgage, deed of trust,
     pledge, conditional sale agreement, easement, lease or other charge or
     encumbrance.

                                      -5-
<PAGE>
 
          "LOSS" or "LOSSES" mean any and all damages, losses, actions,
     proceedings, causes of action, obligations, liabilities, claims,
     encumbrances, penalties, demands, assessments, judgments, Reserve Losses,
     costs and expenses including, without limitation, court costs and
     reasonable attorneys' and consultants' fees and costs of litigation but
     shall not include (a) any interest with respect thereto or (b) economic,
     consequential, punitive or incidental damages claimed, incurred or suffered
     by Purchaser or its Affiliates; provided, that the exclusion set forth in
     this clause (b) shall not apply with respect to economic, consequential,
     punitive or indirect damages required to be actually paid by Purchaser to
     any Person not affiliated with Purchaser.

          "MATERIAL" when used (a) to describe or modify a reference to the
     Business, the Subsidiaries and/or Divisions, and/or (b) to describe or
     modify the effect of any event or situation or state of affairs, means
     material to the assets, operations or financial condition of the Business
     taken as a whole unless otherwise specifically limited or defined, and
     whether or not initial capitalization is used.

          "MATERIAL ADVERSE CHANGE" means a Material adverse change in the
     assets, operations or financial condition of the Business taken as a whole,
     for or during the period indicated.

          "MATERIAL ADVERSE EFFECT" means a Material adverse effect on the
     assets, operations or financial condition of the Business taken as a whole.

          "MATERIAL CONTRACTS" means any (a) joint venture or partnership
     agreement pursuant to which WWTI (with respect to the Business) or any of
     the Subsidiaries (other than any Minority Subsidiary) hold an equity
     interest in any entity (but excluding any project-specific joint venture
     agreements not included elsewhere in this definition), (b) agreement
     pursuant to which WWTI (with respect to the Business) or any of the
     Subsidiaries (other than any Minority Subsidiary) have the right to use any
     Intellectual Property that is Material, (c) collective bargaining agreement
     (other than such arrangements imposed or mandated by applicable foreign
     Law) to which WWTI (with respect to the Business) or any of the
     Subsidiaries (other than any Minority Subsidiary) are a party, (d)
     contract, agreement, commitment or obligation relating to the Business and
     by which WWTI (with respect to the Business) or any of the Subsidiaries
     (other than any Minority Subsidiary) are bound for the purchase or sale of
     goods or services and which could reasonably be expected to provide for
     payments to or from WWTI (with respect to the Business) or any of the
     Subsidiaries over the life of such contract, agreement, commitment or
     obligation, in an amount of $1,000,000 (or foreign currency equivalent) or
     more (other than any such items (i) terminable by WWTI or the Subsidiary
     party thereto on 30 days or less notice without liability, penalties or
     additional cost, (ii) that are agreements providing for the acquisition of
     the stock or assets of another entity by Seller, WWTI (with respect to the
     Business) or any Subsidiary, which acquisition has closed, (iii) that are
     contracts, the provision of goods and services under which has been

                                      -6-
<PAGE>
 
     substantially completed and that does not have future billings in excess of
     $1,000,000, notwithstanding that retainage may be held under such
     contracts, that contractual warranty periods thereunder may not have
     expired or that such contracts may be considered "open" from an accounting
     or other non-operational standpoint, or (iv) that constitute a sales
     representative or distribution agreement under which there have not, during
     the most recent fiscal year, been payments made by WWTI or the Subsidiary
     party thereto in excess of $1,000,000), or (e) contract or agreement of
     WWTI (with respect to the Business) or the Subsidiaries which, if
     terminated or lost, could reasonably be expected to have a Material Adverse
     Effect.

          "MINORITY SUBSIDIARIES" shall mean the Subsidiaries noted as such on
     Schedule 1.2 hereto.

          "NON-COMPETITION AGREEMENT" means the Non-Competition Agreement in the
     form of Exhibit E.

          "NON-U.S. PENSION PLANS" shall have the meaning set forth in Section
     3.10.

          "PARENT GUARANTEES" means all guarantees, agreements, pledges,
     mortgages, letters of credit, bonds or other instruments of Seller and its
     Affiliates (other than the Subsidiaries and WWTI (with respect to the
     Business)) guaranteeing, securing or becoming otherwise obligated with
     respect to any actual or contingent liabilities of the Business, WWTI or
     any of the Subsidiaries.

          "PERMITTED EXCEPTIONS" shall have the meaning set forth in Section
     3.6(a).

          "PERSON" means any individual, corporation, partnership, association,
     limited liability company, trust, governmental or quasi-governmental
     authority or body or other entity or organization.

          "POST-CLOSING ADJUSTMENT" shall have the meaning set forth in Section
     2.3(b).  The Post-Closing Adjustment may be a positive or negative amount
     (i.e., resulting in a payment to either the Seller or Purchaser).

          "PURCHASE PRICE" shall have the meaning set forth in Section 2.2,
     subject to adjustment as set forth in Section 2.3.

          "PURCHASER" shall have the meaning specified in the preamble hereof.

          "PURCHASER INDEMNIFIED PARTY" shall have the meaning set forth in
     Section 10.2.

          "PURCHASER PLANS" shall have the meaning set forth in Section 6.3.

                                      -7-
<PAGE>
 
          "QUALIFIED PLAN" shall have the meaning set forth in Section 3.10.

          "REAL PROPERTY" shall have the meaning set forth in Section 3.3.

          "RELEASE" shall mean the spilling, leaking, pumping, pouring,
     emitting, discharging, injecting, escaping, leaching, dumping or disposal
     of any Hazardous Material into surface water, groundwater, soil, the land
     surface or subsurface, or ambient air.

          "RESERVE LOSSES" shall have the meaning set forth in Section 10.2(b).

          "RESERVED MATTERS" shall mean the following matters with respect to
     the Business, each as of the Closing Date: (a) accounts receivable, (b)
     amounts relating to the completion of the contracts in process of the
     Business, Divisions and Subsidiaries, (c) claims arising from products sold
     or services provided, including product or service warranty claims and
     process guaranty claims, (d) worker's compensation claims, disability
     claims, personal injury claims and severance claims, (e) inventory
     (including, without limitation, finished goods, supplies and raw materials)
     and (f) litigation; provided, however, that Reserved Matters shall not
     include matters known to Seller which should have been, but are not,
     included on Schedule 3.9 or 3.11.

          "RESERVES" means the aggregate amount of the reserves established on
     the Closing Balance Sheet specifically identified with, or available to be
     utilized for, the Reserved Matters as of the Closing Date, established in
     accordance with GAAP (as modified by the Accounting Conventions) and in
     accordance with the Accounting Conventions.

          "RESPONSE ACTION" shall mean any action taken in the investigation,
     removal, confinement, remediation or cleanup of a Release or any
     Environmental Condition. "Response" and "Response Actions" include, without
     limitation, any action which constitutes a "removal" action or "remedial"
     action as defined by (S) 101 of the Comprehensive Environmental Response,
     Compensation and Liability Act, 42 U.S.C. (S) 9601(23) and (24) and which
     is necessary and consistent with the National Contingency Plan promulgated
     thereunder.

          "RETAINED CLAIMS" shall have the meaning set forth in Section 2.1(c).

          "RETAINED LIABILITIES" shall have the meaning set forth in Section
     2.1(c).

          "SECTION 338(H)(10) ELECTIONS" shall have the meaning specified in
     Section 11.4.

          "SELLER" shall have the meaning specified in the preamble hereof.

          "SELLER INDEMNIFIED PARTY" shall have the meaning set forth in Section
     10.4.

                                      -8-
<PAGE>
 
          "SELLER TAX PERIOD" means the period (including all prior taxable
     years) ending on and including the Closing Date.

          "SELLER PLANS" shall have the meaning set forth in Section 3.10.

          "SHARES" means all the shares of capital stock and quotas of share
     capital set forth on Schedule 1.3.

          "STOCK RETENTION AGREEMENT" shall have the meaning set forth in
     Section 2.4(c).

          "SUBSIDIARY" or "SUBSIDIARIES" means the entities listed on Schedule
     1.4.

          "TANGIBLE NET BOOK VALUE" shall mean total assets (excluding goodwill)
     less total liabilities of the Business as of the date of the Closing
     Balance Sheet. The Tangible Net Book Value shall be calculated according to
     the Accounting Conventions and in a manner consistent with the calculation
     thereof on the Balance Sheet.

          "TAXES" mean all taxes, charges, fees, duties, levies or other
     assessments, including (without limitation) income, gross receipts, capital
     stock, net proceeds, ad valorem, turnover, real, personal and other
     property (tangible and intangible), sales, use, franchise, excise, value
     added, stamp, leasing, lease, user, transfer, fuel, excess profits,
     occupational, interest equalization, windfall profits, unitary, severance
     and employees' income withholding, unemployment and Social Security taxes,
     duties, assessments and charges (including the recapture of any tax items
     such as investment tax credits) which are imposed by the United States, or
     any state, local or foreign government or subdivision or agency thereof,
     including, without limitation, any interest, penalties or additions to tax
     related thereto imposed by any taxing authority (including any interest or
     penalties with respect to such Taxes), it being understood that any Taxes,
     penalties or interest attributable to the operations of any Subsidiary
     (including, without limitation, penalties or interest payable as a result
     of an audit of any tax return) shall be deemed to have accrued in the
     period to which such Taxes, penalties or interest are attributable.

          "TRADE NAME AND SERVICE MARK LICENSE AGREEMENT" shall have the meaning
     set forth at Section 6.6.

          "UK MICROFLOC CONTRACTS" means all agreements, contracts and
     arrangements entered into prior to the date hereof and relating to
     Microfloc projects to which JFS (UK) Limited, Tilghman-Wheelabrator Ltd. or
     any other Subsidiary is a named party.

          "WCAI" shall have the meaning set forth in Section 2.2(b).

          "WWTI" shall have the meaning set forth in the recital hereof.

                                      -9-
<PAGE>
 
                                  ARTICLE II

                               PURCHASE AND SALE

     2.1 Purchase and Sale of Shares and Domestic Assets. Subject to the terms
and conditions hereof, at the Closing:

     (a) Seller shall cause the sale, assignment and delivery to Purchaser, and
Purchaser shall purchase and take assignment and delivery of, the Shares.

     (b) Seller shall cause the sale, assignment and delivery to Purchaser, and
Purchaser shall purchase and take assignment and delivery of, the assets, real,
personal, tangible or intangible, used primarily by the Divisions in the
operation of the Business (collectively, the "DOMESTIC ASSETS"). The Domestic
Assets include, but are not limited to:

          (i)    all assets of the Divisions reflected on the Balance Sheet
     (except assets reflected thereon which have been disposed of or used in the
     ordinary course of business after the date of the Balance Sheet);

          (ii)   all assets acquired by the Divisions after the date of the
     Balance Sheet and reflected on the Closing Balance Sheet;

          (iii)  all accounts and notes receivable relating to the Business as
     operated by the Divisions or arising from the operation of the Divisions;

          (iv)   all inventory, stock in trade, work-in-process, and raw
     materials, including supplies inventory and unbilled costs on engineering
     contracts relating exclusively to the Business as operated by the Divisions
     or resulting from the operation of the Divisions;

          (v)    all sales order files, systems order files, purchase order
     files, manufacturing records, customer lists and business files and records
     in Seller's control to the extent relating to the Business;

          (vi)   all Intellectual Property owned by WWTI and relating
     exclusively to the Business, including, without limitation, all royalties,
     rights and interests in connection with any license of such Intellectual
     Property;

          (vii)  all rights and interest to or in all agreements, contracts,
     guarantees, letters of credit, sales contracts, leases, purchase orders,
     sales orders, purchase contracts, service contracts, outstanding bids and
     contracts in process, or sales representative or distributorship contracts,
     in each case relating exclusively to the Business and regardless of whether
     currently in process or completed, including, without limitation, Material
     Contracts and Leases;

                                     -10-
<PAGE>
 
          (viii)  all machinery and equipment used by the Divisions in the
     Business;

          (ix)    all rights of WWTI, to the extent relating exclusively to or
     arising out of the operation of the Business, with respect to any claims,
     demands, causes of action, judgments and pending litigation;

          (x)     the Real Property (and all improvements thereon) and Leases
     (as defined in Sections 3.3 and 3.4) of WWTI relating exclusively to the
     operation of the Divisions;

          (xi)    all right, title and interest in the Governmental Approvals of
     WWTI relating exclusively to the operation of the Divisions, to the extent
     transferable; and

          (xii)   all assets of the Divisions located on (i) the Real Property
     and (ii) the real property that is the subject of the Leases of WWTI
     relating exclusively to the operation of the Divisions, on the date hereof
     and on the Closing Date.

The Domestic Assets shall not include, and Purchaser shall not purchase and take
assignment and delivery of, the following (the "EXCLUDED ASSETS"):

          (1) all rights of WWTI (relating to the operation of the Business) for
     rebates or refunds related to Taxes;

          (2) all securities of any Person not constituting a Subsidiary;

          (3) the "triangle" mark (blue triangle) and all names, trade names and
     trademarks containing the name "Wheelabrator" (other than as provided in
     the Trade Name and Service Mark License Agreement), it being further
     understood that any marks owned by any Subsidiary with respect to the
     "triangle" mark (blue triangle) and all names, trade names and trademarks
     containing the name "Wheelabrator" will be retained by Seller and
     transferred to Seller by each Subsidiary prior to Closing;

          (4) all legal, accounting and tax records pertaining primarily to the
     Retained Liabilities and Excluded Assets;

          (5) all minute books, stock books and corporate records related
     primarily to the Affiliates of Seller operating the Divisions;

          (6) any intercompany balances due to or from Seller or any Affiliate
     of Seller, as in effect on the Closing Date;

          (7) the rights of WWTI and its Affiliates pursuant to the agreements
     listed on Schedule 2.1(b)(I), other than the rights to be assigned to
     Purchaser identified thereon;

                                     -11-
<PAGE>
 
          (8) the rights and interests described on Schedule 2.1(b)(II);

          (9) all assets of the Excluded Businesses, including, without
     limitation, all equity interests, revenue rights, contract business
     prospects, customer lists, other confidential information, privatization
     and industrial outsourcing development projects, and other assets of the
     municipal and industrial wastewater facilities management business of the
     EOS division and the privatization and outsourcing development groups of
     WWTI;

          (10) the capital stock of JFS (UK) Limited; and

          (11) the assets relating to the grate blocks of Wheelabrator
     Environmental Systems Inc. set forth on Schedule 2.1(b)(III).

     (c) Purchaser shall assume and agree to pay, perform or satisfy, in
accordance with their respective terms, all of the Liabilities.

     Notwithstanding clause (c) above, Purchaser shall not assume and shall not
be liable for the following liabilities of Seller, WWTI, the Subsidiaries or the
Divisions (collectively, the "RETAINED LIABILITIES"): (i) the Environmental
Liabilities, (ii) all liabilities under or with respect to the Seller Plans,
including but not limited to liabilities for post-retirement health benefits and
life insurance under such plans, (iii) all liabilities and obligations of, or
arising out of, the Excluded Businesses, including, without limitation, claims
against Wheelabrator Clean Air Systems Inc. and Wheelabrator Canada Inc.
relating to the operation, ownership or use of the assets transferred to a
subsidiary of Seller in accordance with Section 2.1(d) below, (iv) all claims or
obligations with respect to, or arising out of, the Excluded Assets, (v) all
intercompany payables due to Seller or any Affiliate of Seller, (vi) all
liabilities and obligations of WWTI or its Affiliates arising in connection with
the litigation set forth on Schedule 2.1(c)(III), (vii) all liabilities and
obligations of WWTI or its Affiliates arising in connection with the matters set
forth on Schedule 2.1(c)(II) (the "RETAINED CLAIMS"), and (viii) severance and
termination obligations retained by Seller under Section 6.3.

     (d) Prior to Closing, Wheelabrator Clean Air Systems Inc. shall transfer to
a subsidiary of Seller all of its assets which do not constitute part of its (i)
ARI LoCat sulfur recovery business, (ii) AMCEC solvent recovery business, (iii)
Altech Measurement Systems business, (iv) Huntington Energy Systems regenerative
thermal oxidation and the ARI EconAbator catalytic oxidation businesses, or (v)
Westates Carbon business. Such transferred assets are described on Schedule
2.1(d) and shall include all assets used in the Wheelabrator Air Pollution
Control business of Wheelabrator Clean Air Systems Inc. The transferee entity
shall assume all liabilities or obligations of, or claims against, Wheelabrator
Clean Air Systems Inc. relating to the operation, ownership or use of such
assets. Prior to Closing, Wheelabrator

                                     -12-
<PAGE>
 
Canada Inc. shall transfer to a subsidiary of Seller all capital stock owned in
Glegg Industries, Inc., all rights and obligations under that certain Strategic
Alliance Agreement and other agreements entered into in connection with the
acquisition of the capital stock investment in Glegg Industries Inc., and all of
the assets used in the Wheelabrator Air Pollution Control business. Such entity
shall assume all liabilities or obligations of, or claims against, Wheelabrator
Canada Inc. relating to the operation, ownership or use of such assets. Prior to
Closing, Seller shall cause the transfer or dividend of the shares of JFS (UK)
Limited to Seller or one of its subsidiaries or Affiliates. The instruments of
transfer and assumption necessary to effect the matters contemplated by this
Section 2.1(d) shall be substantially in the same form as the other instruments
of transfer between Seller and Purchaser pursuant to this Agreement.

     2.2 Payment at Closing. (a) Subject to the terms and conditions hereof, at
the Closing, Purchaser shall pay by wire transfer of same-day funds, the sum of
$369,600,000 (the "PURCHASE PRICE") to Seller, less any amount to be paid into
escrow pursuant to Section 2.2(b) below. The Purchase Price may be adjusted
following the Closing pursuant to Section 2.3. The Purchase Price shall be
allocated as set forth on Schedule 2.2 among the Shares, the Domestic Assets and
the non-competition covenant set forth in the Non-Competition Agreement, which
Schedule 2.2 shall be agreed to by the parties as soon as practical (but in no
event greater than 30 days) after the Closing Date and thereafter immediately
constitute a part of this Agreement as if attached hereto on the date hereof.
The parties shall adhere to Schedule 2.2 for purposes of any tax report or
filing made by any such party.

     (b) Seller shall retain the shares of common stock of Westates Carbon-
Arizona, Inc. ("WCAI") until (i) all necessary Environmental Approvals have been
received in connection with a change of control of WCAI and the transfer of its
"Part A" RCRA permit and (ii) the Seller has received the consents of the
Colorado River Indian Tribes ("CRIT") and the duly authorized representative of
the Secretary of the Interior to the assignment of the Lease between WCAI and
CRIT dated July 20, 1990 (if required), so as to enable the Seller to cause the
transfer of such shares to Purchaser. Upon receipt of such Environmental
Approvals and such consents, Seller shall promptly cause the transfer to
Purchaser of such shares upon payment of the amount withheld by Purchaser under
this Section 2.2(b) (with interest thereon as provided below). Such payment and
transfer shall occur within three (3) business days of Seller's delivery of
written notice to Purchaser that such Environmental Approvals and consents have
been obtained.

     Seller and Purchaser agree that $10,000,000 of the Purchase Price shall be
paid by Purchaser into escrow at Closing with an escrow agent mutually agreeable
to Seller and Purchaser on the Closing Date, to be held by such escrow agent
pursuant to an escrow agreement with mutually agreeable terms. Such amount shall
be paid to Seller, with interest thereon, upon the transfer of the shares of
WCAI to Purchaser. Promptly after the date of this Agreement (and in any event
within 15 days thereof), Purchaser (with the cooperation of Seller) shall make
all necessary filings to obtain such Environmental Approvals and both such
consents,

                                     -13-
<PAGE>
 
and shall use its best efforts to obtain such Environmental Approvals and
consents as promptly as practicable, including the posting of necessary
financial assurances in connection therewith.

     In the event that the required Environmental Approvals and consents are
obtained prior to Closing, the portion of the Purchase Price described above
shall not be retained by Purchaser and paid into escrow, and the shares of WCAI
shall not be retained by Seller. In the event that the shares of WCAI are
retained by Seller, the Tangible Net Book Value on the Closing Balance Sheet,
and the applicable Base Tangible Net Book Value shall not be adjusted,
notwithstanding the fact that such shares have not been transferred.

     2.3 Closing Balance Sheet. (a) Within thirty (30) days following the
Closing Date, Seller shall deliver to Purchaser a consolidated balance sheet for
the Business dated as of the Closing Date (the "CLOSING BALANCE SHEET"). The
Closing Balance Sheet shall be prepared by Seller at its own expense with the
assistance of the former personnel of the Divisions and personnel of the
Subsidiaries, each as may be reasonably requested by Seller. The parties agree
that the Closing Balance Sheet shall be prepared in accordance with GAAP (as
modified by the Accounting Conventions) and giving effect to the Accounting
Conventions. The Closing Balance Sheet shall not take into consideration any
events occurring after the Closing Date. Following the delivery of the Closing
Balance Sheet to Purchaser, Seller shall permit Purchaser's accountants access
to and review of all work papers and other pertinent information requested from
time to time and used in connection with the preparation of the Closing Balance
Sheet.

     (b) The Purchase Price shall be increased by the amount that the Tangible
Net Book Value as shown on the Closing Balance Sheet is greater, or shall be
reduced by the amount that the Tangible Net Book Value as shown on the Closing
Balance Sheet is less, than the Base Tangible Net Book Value. Such increase or
decrease, as finally determined, shall be referred to herein as the "POST-
CLOSING ADJUSTMENT." The Post-Closing Adjustment shall be remitted by wire
transfer of same-day funds, not later than the tenth (10th) day after the
Closing Balance Sheet becomes final and binding pursuant to Section 2.3(c)
below. The Purchase Price shall be deemed to be (i) decreased to the extent that
the Post-Closing Adjustment is due from Seller to Purchaser or (ii) increased to
the extent that the Post-Closing Adjustment is due from Purchaser to Seller.

     (c) If Purchaser notifies Seller in writing within thirty (30) days after
receipt of the Closing Balance Sheet that Purchaser believes that the Closing
Balance Sheet fails to present fairly in all material respects the financial
condition of the Business in accordance with GAAP (as modified by the Accounting
Conventions) and in accordance with the Accounting Conventions and that the
resolution of such dispute in the manner proposed by Purchaser would result in
an adjustment to the Tangible Net Book Value reflected on the Closing Balance
Sheet of at least $500,000, and such notice states with reasonable specificity
the basis for such disagreement and the amount of the adjustment to Tangible Net
Book Value that would result, Seller and Purchaser shall attempt in good faith
to resolve such dispute as soon as possible. If Purchaser fails to object as
required by this Section 2.3(c), the Closing Balance Sheet as

                                     -14-
<PAGE>
 
prepared by Seller, and the Net Tangible Book Value shown thereon, shall be
conclusive and binding on the parties. If the Purchaser so objects and the
parties are unable to resolve such dispute within thirty (30) days after
Seller's receipt of such notice, the dispute shall be submitted for
determination to a certified public accounting firm mutually acceptable to
Seller and Purchaser. (If the parties cannot agree on such an accounting firm,
the dispute shall be submitted for determination to the Chicago office of
Coopers & Lybrand.) Any portion of the Post-Closing Adjustment that is not in
dispute shall be paid within five (5) business days after the date Purchaser
presents its notice of objection, regardless of the pendency of such dispute.
Such public accounting firm shall review and decide the issues that are the
subject of such dispute as specified in such notice within thirty (30) days
after such submission. The decision of such accounting firm shall be set forth
in writing and delivered to Seller and Purchaser. The decision of such
accounting firm shall be final and binding on Seller and Purchaser, and the
Closing Balance Sheet and the Tangible Net Book Value reflected thereon shall
constitute the final and binding "Closing Balance Sheet" and "Tangible Net Book
Value" for purposes of determining the Post-Closing Adjustment (as defined
above); provided, that the Closing Balance Sheet and the Tangible Net Book Value
reflected thereon shall not be adjusted unless the decision of such public
accounting firm would result in an adjustment to the Tangible Net Book Value of
at least $500,000. The fees and costs of such public accounting firm shall be
borne by Purchaser and Seller in proportion to the amount by which the final
Post-Closing Adjustment reflects their respective positions before commencing
the dispute resolution process; provided, that, if no adjustment is permitted
due to the immediately preceding sentence, Purchaser shall bear all such fees
and costs. Any payment awarded by the expert accounting firm to either party
shall bear interest at the rate of 8% per annum, accruing from the date that
Purchaser delivers its notice of objection pursuant to this part (c) until the
date payment is made.

     2.4 Procedures for Assets not Transferable. (a) If any contract, agreement,
property or right (including, without limitation, any Governmental Approval)
included in the Domestic Assets is not assignable or transferable without the
consent of any third party, and such consent has not been obtained prior to the
Closing Date and the Closing occurs, this Agreement and the related instruments
of transfer shall not constitute an assignment or transfer thereof and Purchaser
shall not assume Seller's obligations with respect thereto. In such case, Seller
shall use commercially reasonable efforts to obtain such consent as soon as
possible after the Closing Date or otherwise obtain for Purchaser the practical
benefit of such contract, agreement, property or right and Purchaser shall
cooperate with Seller in that endeavor. If any order for the purchase of goods
or services included in the Domestic Assets is not assignable by Seller,
Purchaser agrees to purchase from Seller at the purchase order price all
property or services thereunder and Seller agrees to sell the same to Purchaser
at such price, on the terms set forth therein. If any sales order or service
order included in the Domestic Assets is not assignable by Seller, Purchaser
agrees to sell to Seller any products required to complete such sales order or
service order at the same price provided for therein and otherwise to complete
such contracts on behalf of Seller and Seller agrees to purchase the same from
Purchaser at such price. Purchaser shall provide all services necessary to
complete such contracts and orders, and Seller shall hold for Purchaser's
account and promptly remit to Purchaser all amounts payable with

                                     -15-
<PAGE>
 
respect to such contracts. Prior to and after the Closing, Purchaser and Seller
shall cooperate to obtain all necessary consents to the transfer of the Domestic
Assets.

     (b) If Purchaser and Seller are unable to obtain any required consents to
assign or subcontract any particular contract, or Seller and Purchaser agree
that no such consent will be obtained, and no other mutually satisfactory
arrangements are agreed to, then (i) such contract shall be deemed not to have
been transferred to Purchaser, and (ii) the Seller and Purchaser shall treat
such unassigned contract as if Seller and Purchaser had entered into a seconding
arrangement with respect to such unassigned contract as of the Closing Date. To
implement the retroactive treatment of any unassigned contract as a seconded
contract, Seller and Purchaser will enter into a seconding agreement in mutually
agreeable form at the appropriate time.

     (c) At Closing, Purchaser and Seller shall enter into a Stock Retention
Agreement in the form of Exhibit B hereto (the "STOCK RETENTION AGREEMENT") with
respect to the Subsidiaries listed on Schedule 1.3. Pursuant to the Stock
Retention Agreement, (i) Seller (either directly or through one of its wholly
owned subsidiaries) shall continue to hold legal title to any capital stock
included in the Shares for which a necessary consent to transfer has not been
obtained, (ii) Purchaser shall have all beneficial ownership of such capital
stock, and (iii) legal title to such capital stock shall transfer to Purchaser
upon such necessary consent having been granted. Prior to and after the Closing,
Purchaser and Seller shall cooperate to obtain all necessary consents to the
transfer of the Shares that are subject to the Stock Retention Agreement.


                                  ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF SELLER

     Seller represents and warrants to Purchaser as follows:

     3.1 Authority of Seller. Seller is a corporation duly organized, validly
existing and in good standing under the laws of Delaware. Seller has all
requisite corporate power and authority to carry out the transactions
contemplated herein. The execution and delivery of this Agreement by Seller has
been duly authorized by all necessary corporate action. This Agreement has been
duly and validly executed and delivered by Seller and constitutes the legal,
valid and binding obligation of Seller, enforceable against Seller in accordance
with its terms, except as may be limited by (a) applicable bankruptcy,
insolvency, moratorium, reorganization or similar Laws from time to time in
effect which affect creditors' rights generally, or (b) legal and equitable
limitations on the availability of specific remedies. The execution and delivery
of this Agreement by Seller does not, and the consummation of the transactions
contemplated hereby and performance of the obligations hereunder, assuming the
receipt of the consents, approvals and waivers listed on Schedule 3.1, will not:
(i) violate or conflict with any term, condition or provision of (A) the
charter, by-laws or analogous organizational documents of

                                     -16-
<PAGE>
 
Seller or any entity that will be making any sale, transfer or assignment
hereunder, or (B) any applicable Law or contract binding on Seller or Material
Contract, which violation could reasonably be expected to have a Material
Adverse Effect; or (ii) result in the creation of any Lien upon any of the
Shares or the Domestic Assets or any property of any of the Subsidiaries. Except
as set forth on Schedule 3.1, the failure of any Person claiming through Seller
to authorize or approve this Agreement or the transactions contemplated hereby
will not give any Person the right to enjoin, rescind or otherwise prevent or
impede the sale of each and every asset and share constituting the Domestic
Assets and the Shares.

     3.2 Shares and Subsidiaries. (a) All of the Shares are duly authorized,
validly issued, fully paid and nonassessable. Upon transfer of the Shares,
Purchaser will receive (a) directly or indirectly, all issued and outstanding
capital stock or share capital of the Subsidiaries listed on Schedule 1.4,
except the Minority Subsidiaries and except as disclosed on Schedule 3.2 and (b)
to Seller's knowledge, an ownership interest in the Minority Subsidiaries such
that Purchaser will own a percentage of the equity and voting power of each
Minority Subsidiary as set forth on Schedule 3.2 hereto (it being understood
that Seller would not have knowledge of the shares held by other shareholders of
the Minority Subsidiaries currently or as of any particular time). At Closing,
(i) Purchaser shall receive legal (except as contemplated by Section 2.4(c)) and
beneficial title to the Shares listed on Schedule 1.3, free and clear of all
Liens, except for Permitted Exceptions or as set forth on Schedule 3.2 and (ii)
all of the property owned by the Subsidiaries (other than the Minority
Subsidiaries) shall be free and clear of all Liens, except for Permitted
Exceptions or as set forth on Schedule 3.2.

     (b) Set forth on Schedule 3.2 is a complete list of each Subsidiary and
interest therein that Purchaser is acquiring by purchase of the Shares, and a
list of all entities in which such acquired Subsidiaries (other than Minority
Subsidiaries) own capital stock or share capital. All of the Shares listed on
Schedule 1.3, and all of the capital stock or share capital of the Subsidiaries
(other than the Minority Subsidiaries) are duly authorized and issued, fully
paid and nonassessable and held free of Liens, other than Permitted Exceptions
or as set forth on Schedule 3.2.

     (c) Except as set forth on Schedule 3.2 and except with respect to Minority
Subsidiaries, there are no outstanding options, rights, warrants, contracts or
commitments for the issuance or sale by any Subsidiary of, or any securities of
any Subsidiary convertible into or exchangeable for, any shares of capital stock
or other share capital of any Subsidiary.

     (d) Except as set forth on Schedule 3.2, each Subsidiary (other than any of
the Minority Subsidiaries) is a corporation or limited liability company duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization, with all requisite corporate power to own,
lease and operate its properties and to carry on its business as now being
conducted, except where the failure to be so qualified could not reasonably be
expected to have a Material Adverse Effect.

                                     -17-
<PAGE>
 
     (e)  Each of the Subsidiaries (other than the Minority Subsidiaries) is an
indirect, wholly owned subsidiary of Seller. The capital stock or share capital
of the Minority Subsidiaries included in the Shares and listed on Schedule 1.3
are held beneficially by a wholly owned subsidiary of Seller.

     3.3  Real Property. Set forth on Schedule 3.3 is a list of all real
property owned by WWTI (with respect to the Business) and included in the
Domestic Assets or owned by a Subsidiary (other than any Minority Subsidiary)
(the "REAL PROPERTY"). The Real Property is owned by the title holder thereof,
free and clear of all Liens, except Permitted Exceptions. Legal title to all
Real Property (other than Real Property owned by the Subsidiaries) shall be
conveyed to Purchaser at Closing, free and clear of all Liens, except Permitted
Exceptions. The use and operation of all Real Property conforms to all
restrictive covenants, zoning restrictions and restrictions and conditions
affecting title, except for such non-conformity that could not reasonably be
expected to materially interfere with the continued use of such Real Property in
the conduct of normal business operations.

     3.4  Leases. Set forth on Schedule 3.4 is a list of all real property
leases which are included in the Domestic Assets or to which any Subsidiary
(other than any Minority Subsidiary) is party as lessee and a list of all leases
of personal property which are included in the Domestic Assets or to which any
Subsidiary (other than any Minority Subsidiary) is a party as a lessee, in any
case having remaining rental value of at least $250,000 (the "LEASES"). All
rentals currently due under such Leases have been paid. Seller, WWTI and/or each
Subsidiary (as the case may be) has a valid leasehold interest in each Lease, in
each case free and clear of all Liens, except Permitted Exceptions. Seller has
made available to Purchaser a copy of each Lease (as amended). The Leases are
the valid and binding obligations of WWTI or the Subsidiaries (as the case may
be). Neither Seller, WWTI nor any of the Subsidiaries has received any notice of
Default by any Subsidiary thereunder which has not been remedied or waived and
which Default could reasonably be expected to have a Material Adverse Effect.
Neither Seller, WWTI nor any of the Subsidiaries nor any Affiliate thereof has
received any notice or has any knowledge of any pending or threatened
condemnation proceeding or assessment for public improvements affecting any Real
Property or any real property leased pursuant to a Lease or of any sale or other
disposition thereof in lieu of condemnation, which proceeding, assessment, sale
or other disposition could reasonably be expected to materially interfere with
the continued use of any Real Property or any real property subject to a
Material Lease in the conduct of normal business operations. Except as set forth
on Schedule 3.4, no approval or consent of any Person is needed in order for the
Leases (excluding Leases for sales offices) to continue in full force and effect
following consummation of the transactions contemplated by this Agreement.

     3.5  Intellectual Property. Set forth on Schedule 3.5 is a list of the
registered patents, copyrights and trademarks included in the Intellectual
Property (the "REGISTERED INTELLECTUAL PROPERTY"). Except as set forth on
Schedule 3.5, no adverse claim in any Registered Intellectual Property is
pending or, to Seller's knowledge, has been threatened, which claim could

                                     -18-
<PAGE>
 
reasonably be expected to have a Material Adverse Effect. Seller, WWTI or one or
more of the Subsidiaries, as the case may be, has title to all Registered
Intellectual Property, free and clear of all Liens other than Permitted
Exceptions, and all such title of WWTI in the Registered Intellectual Property
shall be conveyed to Purchaser at Closing. No Registered Intellectual Property
is the subject of any interference, oppositions, re-examinations, or
cancellation, except as set forth on Schedule 3.5. To the knowledge of Seller,
no Person is infringing upon, nor has any Person misappropriated any Registered
Intellectual Property, which infringement could reasonably be expected to have a
Material Adverse Effect. Seller has received no notice of infringement by any of
the Divisions or any of the Subsidiaries upon the intellectual property rights
of any other person, which notice of infringement could reasonably be expected
to have a Material Adverse Effect.

     3.6  Title to Assets. (a) Each of the Subsidiaries (other than any Minority
Subsidiary) has, and at the Closing will have, title to its property (including,
without limitation, real, personal and intangible and contract rights), free and
clear of all Liens, except: (i) Liens reflected in the Balance Sheet; (ii) Liens
that could not reasonably be expected to materially interfere with the continued
use of such properties in the conduct of normal business operations; (iii)
mortgages, Liens, pledges, charges or encumbrances listed on any Schedule
hereto; (iv) imperfections or irregularities of title, easements and covenants
running with the land that could not reasonably be expected to materially
interfere with the continued use of such properties in the conduct of normal
business operations; and (v) (A) contractor's, materialman's, supplier's,
worker's, carrier's, employee's, installment sale, title retention and similar
Liens arising by operation of applicable Law; (B) the rights of customers,
suppliers and subcontractors in the ordinary course of business under general
principles of commercial law; and (C) Liens for current Taxes not yet due,
provided that none of the foregoing, in the aggregate, could reasonably be
expected to materially interfere with the continued use of such properties in
the conduct of normal business operations. The Liens described at clauses (i)
through (v) above shall be collectively referred to as the "PERMITTED
EXCEPTIONS."

     (b) Subject to Sections 2.4(a) and (b), at Closing, Purchaser shall acquire
title to the Domestic Assets, free and clear of all Liens, other than Permitted
Exceptions. The Domestic Assets and property owned by the Subsidiaries (other
than any Minority Subsidiary) includes all property (including, without
limitation, real, personal, and intangible property and contract rights)
required for the operation of the Business in substantially the same manner as
it has been operated prior to Closing.

     3.7  No Adverse Change. Except as set forth on Schedule 3.7, since the date
of the Balance Sheet there has not occurred: (a) any Material Adverse Change;
(b) any loss of or damage to any of the properties of WWTI (with respect to the
Business) or any of the Subsidiaries (other than any Minority Subsidiary) that
could reasonably be expected to Materially interfere with the continued use of
such properties in the conduct of normal business operations; (c) any Lien
placed on any of the properties of the Subsidiaries (other than any Minority
Subsidiary), other than Permitted Exceptions; (d) any amendment to or change in
the charter,

                                     -19-
<PAGE>
 
by-laws or analogous organizational documents of any Subsidiary (other than any
Minority Subsidiary); (e) the execution by WWTI (with respect to the Business)
or any of the Subsidiaries (other than any Minority Subsidiary) of any Material
Contract, other than (i) in the ordinary course of business, (ii) with the
permission of Purchaser, or (iii) in connection with the transactions
contemplated hereby; or (f) any strike, picket or work stoppage by any employees
of the Subsidiaries (other than any Minority Subsidiary) or Divisions that has
Materially interfered, or could reasonably be expected to Materially interfere,
with the continued conduct of normal operations of the Business.

     3.8 Tax Matters. WWTI (with respect to the Business) has filed or has
caused to be filed all Federal, state, local and foreign tax returns and reports
required to have been filed relating to the Business. The Subsidiaries (other
than the Minority Subsidiaries) have filed or caused to be filed all tax returns
and reports required to have been filed relating to the Business, except for
failures to file returns and reports which could not reasonably be expected to
have a Material Adverse Effect. All amounts shown on such returns and reports
are accurate and Seller has or will have caused to be paid all Taxes shown as
due and payable on such returns and reports, except for the portion of such
Taxes being contested in good faith. Except as set forth on Schedule 3.8,
neither Seller, WWTI nor any of the Subsidiaries (other than any Minority
Subsidiary) nor any Affiliate of any of them has received notice of: (a) any
audit or examination of any tax return relating to the Business; or (b) any
material adjustment proposed by any governmental agency of any liability for
Taxes relating to the Business.

     3.9 Litigation. Except as set forth on Schedule 3.9, there is no demand,
suit, action, arbitration or legal, administrative or other proceeding, or claim
known to Seller, pending or, to Seller's knowledge, threatened against any of
the Subsidiaries (other than any Minority Subsidiary) and WWTI (with respect to
the Business) which could individually or collectively reasonably be expected to
have a Material Adverse Effect. Except as set forth on Schedule 3.9, none of the
Subsidiaries (other than any Minority Subsidiary) and WWTI (with respect to the
Business) are subject to any order, judgment, decree, stipulation or consent of
or with any court, governmental body, agency or instrumentality, domestic or
foreign, which could reasonably be expected to have a Material Adverse Effect.

     3.10 ERISA. (a) Schedule 3.10 contains a list of all Benefit Plans (i)
maintained or sponsored by Seller for employees of WWTI and its Divisions or
(ii) with respect to which Seller is obligated to contribute for employees of
WWTI and its Divisions, or (iii) that otherwise cover any of the current or
former employees of WWTI and its Divisions, or their beneficiaries ("SELLER
PLANS").

     (b) With respect to each Seller Plan, Seller has made available to
Purchaser a true and correct copy of (i) such Seller Plan (or in the case of an
unwritten Seller Plan, a written summary thereof); (ii) the most recent annual
report (Form 5500) filed with the Internal Revenue Service ("IRS"), (iii) each
trust agreement, if any, relating to such Seller Plan and (iv) the most recent
actuarial report or valuation relating to a Seller Plan subject to Title IV of
ERISA.

                                     -20-
<PAGE>
 
     (c)  Except as set forth on Schedule 3.10, each of the Seller Plans and all
related trusts, insurance contracts and funds have been created, maintained,
funded and administered in all respects in material compliance with all
applicable Laws and in material compliance with the Plan document, trust
agreement, insurance policy or other writing creating the same or applicable
thereto. No Seller Plan is or is proposed to be under audit or investigation,
and no completed audit of any Seller Plan has resulted in the imposition of any
tax, fine or penalty which has not been satisfied. To the knowledge of the
Seller, no prohibited transaction (within the meaning of Section 406 of ERISA
and Section 4975 of the Code) with respect to any Seller Plan exists or has
occurred which could impose any material liability on the Purchaser. To the
knowledge of the Seller, neither Seller nor any member of Seller's controlled
group of corporations (within the meaning of Sections 414(b), 414(c) and 414(m)
of the Code ("CONTROLLED GROUP MEMBER")) nor any administrator or fiduciary of
any Seller Plan, nor any agent of any of the foregoing, has engaged in any
transaction or acted or failed to act in a manner that will subject Seller, any
Subsidiary, or any Controlled Group Member to any material liability for a
breach of fiduciary duty or other duty under ERISA or any other applicable Law.
Except as set forth in Schedule 3.10, no post-retirement benefits are provided
under any Seller Plan that is a welfare benefit plan as described in ERISA
Section 3(1) except as required under Section 4980B of the Code.

     (d) Except as set forth in Schedule 3.10, no Seller Plan is a multiemployer
plan within the meaning of Section 3(37) or Section 4001(a)(30) of ERISA or a
defined benefit plan as defined in Section 3(35) of ERISA.

     (e) With respect to the Seller Plans, individually and in the aggregate, no
event has occurred, and to the knowledge of Seller, there exists no condition or
set of circumstances, that is reasonably likely to have a Material Adverse
Effect under ERISA, the Code, or any applicable law, in connection with the
Seller Plans.

     (f) With respect to the Seller Plans, individually and in the aggregate,
there are no funded benefit obligations for which contributions have not been
made or properly accrued and there are no unfunded benefit obligations which
have not been accounted for by reserves, or otherwise properly footnoted in
accordance with GAAP, in the Financial Statements.

     (g) Except as set forth on Schedule 3.10, WWTI and the Divisions have no
obligation to contribute to any Benefit Plan of the type described Title IV of
ERISA, including but not limited to, in Sections 4062, 4063 or 4064 of ERISA or
Section 413(c) of the Code (any of which shall be hereinafter called a "TITLE IV
PLAN"). Except as set forth on Schedule 3.10, Seller does not have any
liability, and after the Closing Date Seller will not have any liability (i)
under Code Section 412(n), with respect to any Benefit Plan sponsored or
maintained by a Controlled Group Member, and (ii) under Title IV of ERISA with
respect to any Benefit Plan sponsored or maintained by a Controlled Group
Member, including, but not limited to, any withdrawal liability under a
Multiemployer Plan, as defined below, incurred within the five-year period
ending on the date of execution of this Agreement and any liability for unfunded
benefits

                                     -21-
<PAGE>
 
under a defined benefit pension plan terminated or transferred out of any
corporation that may be aggregated with Seller under ERISA Section 4001(a)(14)
or ERISA Section 4001(b) (the "CONTROLLED GROUP") within the five-year period
ending on the date of execution of this Agreement.

     (h)  Schedule 3.10 discloses each Seller Plan that purports to be a
qualified plan under Section 401(a) of the Code and exempt from United States
federal income tax under Section 501(a) of the Code ("QUALIFIED PLAN"). With
respect to each Qualified Plan, a determination letter (or opinion or
notification letter, if applicable) has been received from the IRS that such
plan is qualified under Section 401(a) of the Code, as amended by the Tax Reform
Act of 1986 and all subsequent Code amendments, and the Treasury Regulations
thereunder, and exempt from federal income tax under Section 501(a) of the Code.
To the knowledge of the Seller, no fiduciary of any Qualified Plan, nor any
agent of the foregoing, has done or failed to do anything that would adversely
affect the qualified status of the Qualified Plan or the qualified status of any
related trust.

     (i)  Schedule 3.10 contains a list of all Material Non-U.S. Pension Plans
(as defined below) (i) maintained or sponsored by the Subsidiaries for their
non-U.S. employees or (ii) with respect to which the Subsidiaries are obligated
to contribute for their non-U.S. employees, or (iii) that otherwise cover any of
the current or former non-U.S. employees of the Subsidiaries and their
beneficiaries. For purposes of this Agreement, a "NON-U.S. PENSION PLAN" is a
written employee benefit plan that provides retirement or pension benefits to
the non-U.S. employees of any of the Subsidiaries, excluding any plans
maintained or required by applicable law or governmental authorities. The Seller
has heretofore delivered or made available to Purchaser copies or summaries of
all such plans.

     (j)  Except as set forth on Schedule 3.10, each of the Non-U.S. Pension
Plans and all related trusts, insurance contracts and funds have been created,
maintained, funded and administered in all respects in material compliance with
all applicable Laws and in material compliance with the governing document,
trust agreement, insurance policy or other writing creating the same or
applicable thereto.

     3.11  Material Contracts. Set forth on Schedule 3.11 is a list of all
Material Contracts. There have been made available to Purchaser copies of all
Material Contracts that are in writing (including all amendments thereto, if
any). The Material Contracts are the valid and binding obligation of Seller,
WWTI or the Subsidiaries (as the case may be). None of Seller, WWTI or the
Subsidiaries (as the case may be) is in Default thereunder, nor, to the
knowledge of Seller, is any other party to any such Material Contract in Default
thereunder except any such Default (i) as to which requisite waivers or consents
have been obtained, (ii) which is curable and is cured within the applicable
period for cure permitted under the contract, (iii) relating to the matters
disclosed on Schedule 3.9, or (iv) that could not reasonably be expected to have
a Material Adverse Effect.

                                     -22-
<PAGE>
 
     3.12  Brokers. No broker or investment banker acting on behalf of Seller or
its Affiliates or under the authority of any of them is or will be entitled to
any broker's or finder's fee or any other commission or similar fee directly or
indirectly from Purchaser in connection with any of the transactions
contemplated herein.

     3.13  Environmental.  Except as disclosed on Schedule 3.13 or Schedule
2.1(c)(I):

           (a) To Seller's knowledge, there have been, and there exist, no
     events, incidents, conditions, actions, agreements or circumstances which
     could reasonably be expected to give rise to any liability, loss or expense
     under any Environmental Law, or form the basis for any Environmental
     Action, with respect to Seller or WWTI (with respect to the Business) or
     the Subsidiaries, or any Real Property or property subject to the Leases,
     which liability, loss or expense or Environmental Action could reasonably
     be expected to have a Material Adverse Effect. None of Seller, WWTI, or any
     of the Subsidiaries (during the period affiliated with Seller and excluding
     Minority Subsidiaries) has received any written notice from any
     governmental authority or other person, and to the knowledge of Seller, no
     such notice has been issued to any other Person which indicates the
     occurrence or existence of events, incidents, conditions, actions,
     agreements or circumstances which could reasonably be expected to give rise
     to any liability, loss or expense under any Environmental Law or form the
     basis for any Environmental Action with respect to Seller or WWTI (with
     respect to the Business), the Divisions or Subsidiaries (other than any
     Minority Subsidiary) or the Real Property or property subject to the
     Leases, in each case which liability, loss or expense or Environmental
     Action could reasonably be expected to have a Material Adverse Effect.

          (b) No Hazardous Material is being or, to Seller's knowledge, has
     been, Released on or to any property or facility owned, leased, or operated
     by Seller or WWTI (with respect to the Business), the Subsidiaries (other
     than any Minority Subsidiary) or the Divisions in such manner that under
     any Environmental Law: (i) would impose liability for damages,
     investigation, or Response Actions that could reasonably be expected to
     have a Material Adverse Effect; (ii) would affect the value of the Domestic
     Assets, Divisions or Subsidiaries (other than any Minority Subsidiary) (or
     their respective businesses, property or assets) that could reasonably be
     expected to have a Material Adverse Effect; or (iii) would result in the
     imposition of a Lien (other than Permitted Exceptions) on the property or
     assets of the Divisions or Subsidiaries (other than any Minority
     Subsidiary). No notice of any restriction on present or future use is
     required to be placed at any Real Property or property subject to a Lease
     or in any deed to any Real Property, which restriction could reasonably be
     expected to materially interfere with the continued use of such Real
     Property or property subject to a Lease in the conduct of normal business
     operations.

          (c) No Hazardous Material has been Released at any other site by the
     Divisions or Subsidiaries (during the period affiliated with Seller and
     excluding Minority

                                     -23-
<PAGE>
 
     Subsidiaries) or by any contractor or agent acting on their behalf during
     the applicable period (including but not limited to any person transporting
     or distributing Hazardous Materials on behalf of the Divisions or
     Subsidiaries, other than any Minority Subsidiary) in such manner that under
     any Environmental Law would impose liability for damages, investigation, or
     Response Actions, which liability could reasonably be expected to have a
     Material Adverse Effect.

          (d)  To Seller's knowledge, any underground or aboveground storage
     tanks and associated piping currently on the Real Property are in sound
     condition and have been properly maintained, tested and monitored in
     compliance with applicable Environmental Laws in all material respects, and
     no spills or leaks have occurred from or in relation with such tanks and
     piping on the Real Property or property subject to a Lease, which spills or
     leaks could reasonably be expected to have a Material Adverse Effect. To
     Seller's knowledge, any tanks on the Real Property or property subject to a
     Lease which were previously removed from service while such property was
     controlled by a Division or Subsidiary (while affiliated with Seller and
     excluding Minority Subsidiaries) have been properly closed, in compliance
     with all applicable Environmental Laws. With respect to each such tank
     which has been removed from service or closed, except for instances which
     would not have a Material Adverse Effect, testing and observations confirm
     either that there were no spills, leaks or other contamination related to
     such tanks and associated piping, or that any such contamination has been
     removed.

          (e)  Seller, WWTI (with respect to the Business), and the Subsidiaries
     (other than any Minority Subsidiary) possess all Environmental Approvals
     required for the conduct of the Business and the operations on, and uses
     of, the Real Property and property subject to the Material Leases, in the
     manner in which the Business, operations and uses are currently being
     conducted, except where the failure to do so could not reasonably be
     expected to materially interfere with such Business, operations or use.
     Schedule 3.13 sets forth a list of all such Environmental Approvals,
     identifying the nature thereof. All such Environmental Approvals are in
     full force and effect, and each such Environmental Approval is final, any
     fixed period for appeal or review having elapsed. To the knowledge of
     Seller, WWTI and the Subsidiaries, no suit, action, proceeding or appeal is
     pending or threatened to revoke, suspend or materially and adversely modify
     (except the permitting process at WCAI) any such Environmental Approval.
     Neither Seller, WWTI, nor any Division or Subsidiary (other than a Minority
     Subsidiary) has received notice from a Governmental Authority that it is in
     material violation of any such Governmental Approval.

          (f)  Seller, WWTI (with respect to the Business), the Divisions and
     Subsidiaries (other than any Minority Subsidiary) have made all
     Governmental Filings required under all applicable Environmental Laws with
     respect to the conduct of the Business and the operations on, and use of,
     the Real Property and property subject to the Leases, in the manner in
     which the Business, operations and use are currently being

                                     -24-
<PAGE>
 
     conducted, expect for such filings, the absence of which could not
     reasonably be expected to materially interfere with such Business,
     operations or use.

     3.14  Qualification. Each of the Subsidiaries (other than any Minority
Subsidiary) is duly qualified to do business in each jurisdiction where the
conduct of its business or ownership of its properties requires such
qualification, except where the failure to qualify could not reasonably be
expected to have a Material Adverse Effect. None of Seller, WWTI, (with respect
to the Business) or the Subsidiaries (other than any Minority Subsidiary) is
subject to any contractual restriction that prohibits it from carrying on the
Business in the areas of the world where the Business has been conducted, except
for such restrictions that could not reasonably be expected to have a Material
Adverse Effect.

     3.15  Compliance with Law; Regulatory Compliance. (a) Except as set forth
in Schedule 3.15, none of WWTI or Seller (with respect to the Business), the
Divisions or the Subsidiaries (other than any Minority Subsidiary) is or has
within the past three years (or such shorter period of time that the Subsidiary
in question has been an Affiliate of Seller) been in violation of any applicable
Law (excluding Environmental Laws), ordinance or other requirement of any
governmental authority relating to it or its securities, property, operations or
business, which has resulted in a fine or penalty in excess of $10,000, nor does
Seller have notice of any such violation.

     (b)   Seller and WWTI (with respect to the Business), and the Divisions and
Subsidiaries possess (other than any Minority Subsidiary), or have made timely
application for, all governmental approvals with and under all Laws (excluding
Environmental Laws) required to carry on the Business as presently conducted
(the "GOVERNMENTAL APPROVALS"), except for such Governmental Approvals the
absence of which could not reasonably be expected to materially interfere with
the continued conduct of the Business in the normal course. Schedule 3.15 sets
forth a list of all Governmental Approvals (other than Environmental Approvals)
referred to in the foregoing sentence, identifying each such Governmental
Approval by number and indicating the holder, the issuer and the nature thereof.
All such Governmental Approvals referred to in the foregoing sentence are in
full force and effect. Neither Seller, WWTI (with respect to the Business) nor
any Division or Subsidiary (other than any Minority Subsidiary) is in violation
of any such Governmental Approval, which violation could reasonably be expected
to materially interfere with the continued conduct of the Business in the
ordinary course. Except as disclosed in Schedule 3.15, no proceeding is pending
or, to the knowledge of Seller, threatened to revoke, suspend or materially
modify any Governmental Approval (other than Environmental Approvals) or deny
any renewal thereof, except any such matter that could not reasonably be
expected to Materially interfere with the continued conduct of the Business in
the ordinary course.

     (c)  Except as disclosed in Schedule 3.15, Seller, WWTI, the Divisions and
the Subsidiaries (other than any Minority Subsidiary) have made all governmental
filings required to be made with any governmental authority with respect to the
operation of the Business, except

                                     -25-
<PAGE>
 
for filings under Environmental Laws and such filings the absence of which could
not reasonably be expected to Materially interfere with the continued conduct of
the Business in the ordinary course.

     3.16  Financial Statements. Schedule 3.16 is a true and complete copy of
the unaudited, combined Balance Sheet as of August 31, 1996 and the related
unaudited, combined statement of income, before tax, for the eight-month period
then ended for the Business (including the Minority Subsidiaries) (together, the
"FINANCIAL STATEMENTS"). Except as disclosed in Schedule 2.3 hereto, the
Financial Statements were prepared in accordance with GAAP applied on a
consistent basis throughout the period involved (except as may be indicated in
the Accounting Conventions) and in accordance with the Accounting Conventions
and fairly present the financial position of the Business as at such date and
the results of the operation of the Business for the period then ended.

     3.17  Indebtedness; Parent Guarantees. (a) Schedule 3.17 sets forth a list
of each instrument which evidences Indebtedness, and the aggregate principal
amount thereof outstanding as of the date hereof, and lists each such instrument
that contains a restriction, limitation or encumbrance, of any kind, on the
ability of any Subsidiary (other than any Minority Subsidiary) to pay dividends
on its respective capital stock. All of such instruments are the valid and
binding obligation of the Subsidiaries or Divisions (as the case may be). None
of Seller, WWTI, the Subsidiaries (other than any Minority Subsidiary) or
Divisions (as the case may be) is in Default thereunder nor, to the knowledge of
Seller, is any other party to any such instrument in Default thereunder, nor, to
the knowledge of Seller, does any condition exist that, with the giving of
notice or lapse of time or both, would constitute a Default thereunder, which
Default could reasonably be expected to have a Material Adverse Effect.
"INDEBTEDNESS" as used herein shall mean, with respect to Seller or WWTI (in
connection with the Business), the Subsidiaries (other than any Minority
Subsidiary) or Divisions (other than, in each case, amounts due to Seller or any
Affiliate of Seller or other amounts constituting intercompany accounts): (i)
all indebtedness as of August 31, 1996 for borrowed money, draws under letters
of credit or amounts due under bonds; (ii) all indebtedness for borrowed money
of any Person secured by any Lien upon any Domestic Asset or property or asset
of any Subsidiary or guaranteed by any Subsidiary (other than customary rights
of off-set or other rights with respect to funds or documents in possession of a
bank); and (iii) all amendments, renewals, extensions or refundings of any of
the foregoing. Schedule 3.17 sets forth a list of the Parent Guarantees.

     (b)  Except as described in Schedule 3.17, to the knowledge of Seller,
there are no claims for indemnity asserted by any officer, director or employee
of the Subsidiaries (other than any Minority Subsidiary) or Divisions which
remain unresolved.

     (c)  None of the Subsidiaries (other than any Minority Subsidiary) has
guaranteed or assumed any Indebtedness or liability of Seller or any Affiliate
of Seller.

                                     -26-
<PAGE>
 
     3.18  Employment. (a) Schedule 3.18 sets forth a list of all employment
agreements with any officer, director or employee of the Divisions or
Subsidiaries (other than any Minority Subsidiary) (a) entered into outside the
ordinary course of business in the case of non-United States Subsidiaries (as
evaluated by reference to the custom and practice of the jurisdiction of
incorporation of the Subsidiary at issue) or (b) providing for severance
payments exceeding $100,000 in excess of statutorily required amounts (the
"EMPLOYMENT AGREEMENTS"). Seller has previously furnished to Purchaser copies of
all Employment Agreements, together with all amendments thereto (if any). Since
the date of the Balance Sheet, none of Seller or WWTI (with respect to the
Business) or any Subsidiary (other than any Minority Subsidiary) or Division has
(i) effected any Material increase in salary, wage or other compensation of any
kind, whether current or deferred, to any officer, director or employee, other
than in the ordinary course of business in accordance with past practice, or as
required by applicable Law or any Employment Agreement, or (ii) made any
contribution to any trust or plan for the benefit of employees except as
required by the terms thereof as now in effect. Set forth at Schedule 3.18 is a
list of (or Seller will provide prior to Closing a list of) all officers and
directors of the Subsidiaries.

     3.19  Labor Relations. Except as set forth on Schedule 3.9 or Schedule
3.19, no employee of the Subsidiaries (other than any Minority Subsidiary) or
Divisions is represented by any union or other labor organization and no
collective bargaining agreements with respect to the Business are in effect. No
representation election, arbitration proceeding, grievance, labor strike,
slowdown or stoppage is pending or, to the knowledge of Seller, threatened
against, the Subsidiaries (other than any Minority Subsidiary) or Divisions,
which in any case could reasonably be expected to materially interfere with the
continued conduct of the Business in the ordinary course. No complaint with
respect to the Subsidiaries (other than any Minority Subsidiary) or Divisions is
pending or, to the knowledge of Seller, threatened before the National Labor
Relations Board, the Equal Employment Opportunity Commission or any similar
state or local or foreign agency, by or on behalf of any employee of the
Subsidiaries (other than any Minority Subsidiary) or Divisions, other than as
disclosed on any Schedule hereto, which complaint could reasonably be expected
to have a Material Adverse Effect.

     3.20  Inventory. All of the finished goods inventories of the Subsidiaries
(other than any Minority Subsidiary) or Divisions are, net of reserves on the
Balance Sheet, saleable in the ordinary course of the business within a
reasonable time.

     3.21  Receivables. All receivables of the Subsidiaries (other than any
Minority Subsidiary) and Divisions arose or will arise from transactions of such
Subsidiaries and Divisions in the ordinary course of business.

DISCLAIMERS:
- ----------- 

The representations and warranties set forth in this Article III shall not apply
with respect to any Minority Subsidiary or the Excluded Businesses. No
representation is made, and all representations, express, implied or otherwise,
are disclaimed, with respect to any Minority

                                     -27-
<PAGE>
 
Subsidiary including, without limitation, the operations, assets,
capitalization, stock or liabilities thereof. The foregoing disclaimer shall not
apply to the representations set forth in the last sentence of Section 3.2(a).

EXCEPT TO THE EXTENT OF THE EXPRESS REPRESENTATIONS AND WARRANTIES CONTAINED IN
THIS AGREEMENT, PURCHASER IS ACQUIRING THE SHARES AND THE DOMESTIC ASSETS SOLELY
IN RELIANCE ON ITS OWN INVESTIGATION. SELLER DISCLAIMS ALL EXPRESS WARRANTIES
NOT CONTAINED IN THIS AGREEMENT AND ALL IMPLIED WARRANTIES INCLUDING, WITHOUT
LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
WITH RESPECT TO MACHINERY, EQUIPMENT AND OTHER TANGIBLE ASSETS. PURCHASER IS
ACQUIRING ALL TANGIBLE ASSETS ON AN "AS-IS, WHERE-IS" BASIS. EXCEPT AS EXPRESSLY
SET FORTH IN SECTION 3.13 HEREOF, PURCHASER WAIVES ALL RIGHTS TO INDEMNIFICATION
OR CONTRIBUTION FOR ENVIRONMENTAL CONDITIONS AGAINST SELLER ON, AT, OR MIGRATING
FROM THE REAL PROPERTY OR PROPERTY SUBJECT TO THE LEASES, INCLUDING, WITHOUT
LIMITATION, ANY RIGHTS TO INDEMNIFICATION OR CONTRIBUTION PURSUANT TO THE
COMPREHENSIVE ENVIRONMENTAL RESPONSE COMPENSATION AND LIABILITY ACT AND ANY
SIMILAR STATE LAWS.

Seller disclaims any representations or warranties to Purchaser, except as
specifically set forth in this Agreement. In particular, Seller disclaims any
representation or warranty with respect to any information concerning the
Subsidiaries and Divisions, the Business or the Domestic Assets including,
without limitation, any financial projection or forecast relating to the
Business, the Domestic Assets or the Subsidiaries and Divisions. With respect to
any such projection or forecast delivered to Purchaser, Purchaser acknowledges
that (a) there are uncertainties inherent in such projections and forecasts and
(b) Purchaser is familiar with such uncertainties and takes full responsibility
for making its own evaluation of the adequacy and accuracy of all such
projections and forecasts. Purchaser shall have no claim against Seller, and
Seller shall have no liability to Purchaser, with respect to any such disclaimed
information, including, without limitation, any financial projection or forecast
relating to the Subsidiaries and Divisions, the Business or the Domestic Assets.


                                  ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF PURCHASER

     Purchaser represents and warrants to Seller as follows:

     4.1  Authority of Purchaser. Purchaser is a corporation duly organized,
validly existing and in good standing under the laws of Delaware, with all
requisite corporate power and authority to carry out its obligations under this
Agreement. The execution, delivery and

                                     -28-
<PAGE>
 
performance of this Agreement by Purchaser has been duly authorized by all
necessary corporate action. This Agreement has been duly and validly executed
and delivered by Purchaser and constitutes the legal, valid and binding
obligation of Purchaser, enforceable against Purchaser in accordance with its
terms, except as may be limited by: (a) applicable bankruptcy, insolvency,
moratorium, reorganization or similar laws from time to time in effect that
affect creditors' rights generally; or (b) legal and equitable limitations on
the availability of specific remedies. The execution and delivery of this
Agreement by Purchaser does not, and the consummation of the transactions
contemplated hereby and performance by Purchaser of its obligations hereunder
will not violate or conflict with any provision of: (A) the Certificate of
Incorporation or by-laws of Purchaser; or (B) any applicable Law or agreement
which violation could reasonably be expected to have a material adverse effect
on the financial condition of Purchaser. The failure of any Person claiming
through Purchaser and not a party hereto to authorize or approve this Agreement
or the transactions contemplated hereby will not give any Person the right to
enjoin, rescind or otherwise prevent or impede the purchase or the other
transactions contemplated hereby.

     4.2  Brokers. No broker or investment banker acting on behalf of Purchaser
is or will be entitled to any broker's or finder's fee or any other commission
or similar fee directly or indirectly from Seller or any of its Affiliates in
connection with any of the transactions contemplated hereby. Purchaser shall pay
all fees due to Donaldson, Lufkin & Jenrette Securities Corporation arising in
connection with this Agreement.

     4.3  Securities. Purchaser hereby acknowledges that the Shares being
purchased by Purchaser hereunder are not registered under the Securities Act of
1933 or registered or qualified for sale under any state or foreign securities
Law and cannot be resold without registration thereunder or exemption therefrom.
Purchaser is acquiring such Shares for its own account as principal, for
investment and not with a view toward the sale or distribution thereof.
Purchaser has sufficient knowledge and experience in financial and business
matters to enable it to evaluate the risks of investment in such Shares and has
the ability to bear the economic risks of such investment.

     4.4  Financing. At Closing, Purchaser shall have sufficient funds available
to effect the purchases and other obligations of Purchaser hereunder.


                                   ARTICLE V

                              COVENANTS OF SELLER

     Seller hereby covenants to and agrees with Purchaser as follows:

                                     -29-
<PAGE>
 
     5.1  Corporate and Other Actions. Prior to the Closing Date, Seller shall
use all commercially reasonable efforts to fulfill its obligations under this
Agreement and to consummate the transactions contemplated hereby.

     5.2  Full Access. Prior to the Closing Date, Seller shall cause the
Subsidiaries and Divisions to afford Purchaser and its counsel, accountants and
other authorized representatives, with reasonable prior notice, reasonable
access during normal business hours (when accompanied by an authorized
representative of the Subsidiaries and Divisions) to the respective premises,
properties, personnel, books and records of the Business. Purchaser shall
cooperate with Seller to minimize the disruption occasioned by such access.

     5.3  Ordinary Course of Business. Prior to the Closing Date, Seller shall
cause the Subsidiaries (other than the Minority Subsidiaries) and Divisions to
be operated in the usual and ordinary course of business in substantially the
same manner as heretofore conducted, to pay all debts and Taxes when due
(subject to good faith disputes over such debts or Taxes) and to pay or perform
all other obligations when due (subject to good faith disputes). Except as
otherwise consented to in writing by Purchaser, Seller shall use its
commercially reasonable efforts consistent with past practices and policies to
(a) preserve intact the assets and properties of the Business, (b) keep
available the services of the present officers and key employees of the
Business, and (c) preserve relationships with customers, suppliers,
distributors, licensors, licensees, and others having dealings with the
Business; it being understood that the matters referred to in clauses (a), (b)
and (c) above may be adversely affected by the announcement of the transactions
contemplated hereby. Seller shall promptly notify Purchaser of any occurrence
not in the ordinary course of business of the Business, which occurrence could
reasonably be expected to have a Material Adverse Effect. In particular, and not
by means of limitation, none of the Subsidiaries (excluding the Minority
Subsidiaries) shall, except as permitted by this Agreement or as required by
applicable Law, (i) issue any shares of, or any securities convertible into any
shares of, their respective capital stock or share capital, or any other
securities, accept any subscription for shares of their respective capital
stock, issue options, warrants or similar instruments granting the right to
purchase any shares of their respective capital stock, (ii) declare, pay or set
aside for payment, any dividend or other distribution on their respective
capital stock or share capital, (iii) directly or indirectly, redeem, purchase
or otherwise acquire any shares of their respective capital stock or share
capital, (iv) alter, amend or repeal any provision of its articles of
incorporation or bylaws or other organic documents, (v) change the number or
identity of its directors (other than as a result of the death, retirement or
resignation of a director), or (vi) form or acquire any subsidiaries not
existing as of the date of this Agreement. In addition, and not in limitation of
the foregoing, between the date hereof and the Closing Date, Seller shall cause
WWTI (with respect to the Business) and Subsidiaries (other than the Minority
Subsidiaries) to:

          (A)  preserve and maintain the corporate existence of Seller, WWTI and
     the Subsidiaries (other than the Minority Subsidiaries) and all rights,
     privileges and

                                     -30-
<PAGE>
 
franchises reasonably necessary or desirable in the normal conduct of the
Business, except to the extent contemplated by any transactions permitted by
this Agreement;

          (B) not (except in the ordinary course of business) purchase any
     assets or stock of any corporation, partnership, association or other
     business organization or entity or any division thereof for use in the
     Business or by the Subsidiaries (other than the Minority Subsidiaries), nor
     agree to do so;

          (C) not sell, lease, assign, transfer or otherwise dispose of any of
     the assets of the Business (including, without limitation, Intellectual
     Property), nor suffer to exist or create any Lien on any of the assets of
     the Business, except as permitted by this Agreement or in the ordinary
     course of business and except that assets which are obsolete may be
     disposed of;

          (D) not incur any Indebtedness in excess of $1,000,000, (other than
     intercompany Indebtedness with respect to the Divisions) or the issuance of
     or drawings under letters of credit or utilization of overdraft facilities,
     each in the ordinary course of Business;

          (E) not, except in the ordinary course of business, enter into, modify
     or terminate any Material Contracts or Leases or Employment Agreements, or
     agree to do so;

          (F) maintain the books, accounts and records of the Business in the
     usual, ordinary and regular manner and in material compliance with all
     applicable Laws;

          (G) use its commercially reasonable efforts to meet its obligations
     under all Material Contracts and Leases and not become in Default
     thereunder;

          (H) maintain the assets of the Business in good repair, order and
     condition, reasonable wear and tear excepted, and maintain insurance upon
     the Business and assets thereof at least comparable in amount and kind to
     that in effect on the date hereof;

          (I) not authorize or make any capital expenditure in connection with
     the Business in excess of $1,000,000 individually, except for the matters
     set forth on Schedule 5.3(I); and

          (J) use its commercially reasonable efforts not to violate any Law
     applicable to the Business, nor violate any order, injunction or decree
     applicable thereto.

     5.4  Payment of Taxes.  Prior to Closing, Seller shall pay or cause to be
paid on a timely basis, or provide an adequate reserve for, all Taxes that have
accrued with respect to the operations of the Subsidiaries (other than the
Minority Subsidiaries) for the Seller Tax Period.

                                      -31-
<PAGE>
 
     5.5  HSR FILINGS.  AS PROMPTLY AS PRACTICABLE, SELLER SHALL (IN COOPERATION
WITH pURCHASER) MAKE ALL FILINGS AND SUBMISSIONS UNDER THE HSR ACT AND ANY
FOREIGN COMPETITION, INVESTMENT, FOREIGN EXCHANGE, TAX OR OTHER FOREIGN LAWS.

     5.6  Litigation Support and Access After Closing. In the event and for so
long as Purchaser or any of its Affiliates is a party to any action, suit,
proceeding, hearing, investigation, complaint, claim or demand ("LITIGATION") in
connection with (i) any transaction contemplated under this Agreement or (ii)
any fact, situation, circumstance, status, condition, activity, practice, plan,
occurrence, event, incident, action, failure to act, or transaction on, prior to
or after the Closing Date, involving the Business, the Domestic Assets or the
Subsidiaries, Seller will cooperate with Purchaser and its counsel, make
available its personnel, and provide such testimony and access to its books and
records as shall be necessary in connection with the Litigation. Seller
acknowledges and agrees that, from and after the Closing, Purchaser will be
entitled to possession of all documents, books, records, agreements, and
financial data of any sort relating exclusively to the Business, other than the
Excluded Assets or Retained Liabilities. Furthermore, for a period of five (5)
years following the Closing Date, Seller shall preserve the books and records of
the Business (to the extent possession thereof is not taken by Purchaser) and
shall provide such access to such books and records as Purchaser shall
reasonably request.

     5.7  No Solicitation. (a) Subject to Section 5.7(b) below, from and after
the date hereof until the Closing Date, Seller shall not, directly or
indirectly, through any officer, director, key employee, representative,
Affiliate, or agent of Seller, the Divisions or any of the Subsidiaries, (i)
solicit, initiate, or encourage any inquiries or proposals that constitute, or
could reasonably be expected to lead to, a proposal or offer for a merger,
consolidation, business combination, sale of assets, sale of shares of capital
stock or similar transactions to the extent involving the Domestic Assets or the
Shares, other than the transactions with Purchaser contemplated by this
Agreement (any of the foregoing inquiries or proposals being referred to in this
Agreement as an "ACQUISITION PROPOSAL"), (ii) engage in negotiations or
discussions concerning, or provide any non-public information to any person or
entity reacting to, any Acquisition Proposal, or (iii) agree to approve or
recommend any Acquisition Proposal. Seller shall notify Purchaser immediately
upon receipt by Seller (or its advisors) of any Acquisition Proposal or any
request for non-public information in connection with a possible Acquisition
Proposal or for access to the properties, books or records of the Business by
any person or entity. Such notice shall be made orally and in writing and shall
indicate in reasonable detail the identity of the offeror and the terms and
conditions of such proposal, inquiry or contact.

     (b)  Nothing in this Agreement shall prohibit Seller from furnishing
information to, or entering into discussions or negotiations with, or completing
any transaction with any person or entity that makes an unsolicited written bona
fide proposal to acquire all or any of the Domestic Assets or any of the
Subsidiaries (whether pursuant to a merger, consolidation, share exchange,
business combination, tender or exchange offer or stock or asset purchase) and
in respect of which such person or entity has the necessary funds or written
commitments therefor if, and only

                                     -32-
<PAGE>
 
to the extent that, the Board of Directors of Seller, after consultation with
and based upon the written advice of counsel reasonably acceptable to Purchaser
and the written advice of an banking firm reasonably acceptable to Purchaser
that the Acquisition Proposal is more favorable to Seller from a financial point
of view then the transaction contemplated by this Agreement, determines in good
faith that such action is necessary for the Board of Directors of Seller to
comply with its fiduciary duties to stockholders under applicable Law.

     5.8   Employee Solicitation. Until the second anniversary of the Closing
Date, neither the Seller nor any subsidiary of Seller shall solicit any
management employee employed by any of the Divisions or any of the Subsidiaries,
at the time of the solicitation, to leave the employ of any of the Divisions or
any of its Subsidiaries; provided, that nothing contained herein shall prevent
or restrict the Seller or any of its subsidiaries from (i) soliciting or
employing any individual to be employed by Seller or one of its subsidiaries in
a business that is not competitive with the Business, (ii) employing any
individual who responds to a general solicitation for employment made by or on
behalf of the Seller or any of its subsidiaries, or (iii) employing any
individual who, after the Closing, initiates contact with the Seller or any of
its subsidiaries for purposes of seeking employment.

     5.9   Failure to Close. If (i) the transactions contemplated hereby are not
consummated by December 31, 1996, (ii) Purchaser terminates this Agreement
pursuant to Section 9.4(b), and (iii) Seller is in breach of its obligations
under Section 5.7, then Seller shall pay Purchaser the amount of $20,000,000 as
liquidated damages and not as a penalty. Seller shall pay such liquidated
damages to Purchaser within three (3) business days after its receipt of
Purchaser's notice of termination by wire transfer to an account designated by
Purchaser in its notice of termination. Interest on any delinquent portion of
such payment shall accrue at the rate of 10% per annum. Recovery of such
liquidated damages shall be the sole and exclusive remedy of Purchaser against
Seller if the events described in clauses (i), (ii) and (iii) above occur.
Purchaser shall be entitled to recover such liquidated damages regardless of the
amount of damages actually incurred, the parties agreeing that actual damages
would be difficult to determine and that the amount set forth herein is a fair
and equitable amount to compensate Purchaser.

     5.10  Filings.  Seller shall be solely responsible for (i) all late filing
penalties assessed by the IRS and the U.S. Department of Labor ("DOL")
respecting any 5500 form for any Benefit Plan and (ii) taxes or penalties levied
by the IRS or DOL respecting the lack of a written plan document containing any
Benefit Plan, including but not limited to Seller's severance pay plan.

     5.11  Insurance.  Seller will comply with its obligations under the
Insurance Agreement as if such obligations were set forth fully herein.

                                     -33-
<PAGE>
 
                                  ARTICLE VI

                            COVENANTS OF PURCHASER

     Purchaser hereby covenants to and agrees with Seller as follows:

     6.1   Corporate and Other Actions.  Prior to the Closing Date, Purchaser
shall use all commercially reasonable efforts to fulfill its obligations under
this Agreement and to consummate the transactions contemplated hereby.
Purchaser shall promptly file and prosecute applications for any licenses and
permits required for it to own the Domestic Assets or own the Shares.

     6.2   Confidentiality.  Purchaser affirms its obligations under the letter
agreement dated July 23, 1996 between WWTI and Purchaser.

     6.3   Employees; Benefit Plans.  (a)  For periods on and after the Closing
Date, Purchaser shall employ, or cause the Subsidiaries to continue to employ,
the employees of the Subsidiaries and Divisions, and to allow such employees to
participate in Purchaser's current employee benefit plans.  Notwithstanding the
foregoing, Purchaser shall not be required to so employ any of the employees
listed on Schedule 6.3(e)(I) but may offer employment to any such employee prior
to October 31, 1996 and, if such offer is accepted, such employee shall become
an employee of Purchaser on the Closing Date; and provided that without the
prior written consent of the Seller, Purchaser shall not employ, and shall not
solicit for employment, those employees of the Business listed on Schedule
6.3(e)(II) hereto.

     Effective as of the Closing Date, employees of the Subsidiaries and
Divisions shall cease to participate in all Seller Plans.  Employees of the
Subsidiaries and Divisions shall be given credit for their service with the
Seller and its Affiliates under the employee benefit plans, programs and
arrangements maintained by Purchaser (the "PURCHASER PLANS") for their service
with the Seller and its affiliates for purposes of any eligibility requirements
and waiting periods, and such employees shall be treated as having satisfied any
applicable pre-existing condition limitations, deductibles, copayments and out-
of-pocket limits under the Purchaser Plans to the extent that such items would
have been satisfied under the Benefit Plan in which the employee participated
immediately prior to the Closing Date that provided the same category or type of
benefit.

     (b)   As soon after the Closing hereunder as is reasonably possible, the
assets and liabilities under the Wheelabrator-Rust Savings and Retirement Plan
("SELLER'S 401(K) PLAN") allocable to the employees of Seller who will be
employed by Purchaser subsequent to the Closing hereunder ("TRANSFERRED
EMPLOYEES") shall be transferred directly from the Seller's 401(k) Plan and the
trust fund thereunder to the United States Filter Corporation 401(k) Plan
("PURCHASER'S 401(K) PLAN") and the trust fund thereunder in accordance with the
requirements of Section 401(a)(12) of the Code, and subject further to the 30-
day advance-notification-to-the-

                                      -34-
<PAGE>
 
IRS requirement under Section 6058(b)of the Code if required by the existence of
a suspense account under the Seller's 401(k) Plan or for any other reason.
After the date of such transfer of assets and liabilities under the Seller's
401(k) Plan and trust fund thereunder to the Purchaser's 401(k) Plan and trust
fund thereunder, all of the rights and options applicable to the Transferred
Employees' account balances under the Seller's 401(k) Plan shall be preserved as
to such account balances under the Purchaser's 401(k) Plan, and all subsequent
benefit accruals allocable to the Transferred Employees under the Purchaser's
401(k) Plan shall be based on the terms and provisions of the Purchaser's 401(k)
Plan.  Seller and Purchaser shall take all corporate actions and execute all
documents, including, but not limited to, Plan amendments and 5310-A filings, as
are necessary to effect the foregoing spin-off from the Seller's 401(k) Plan to
the Purchaser's 401(k) Plan.

     (c)   The parties acknowledge and agree that all provisions contained in
this Agreement with respect to Benefit Plans or employee compensation are
included for the sole benefit of the respective parties hereto and shall not
create any right in any other Person, including, without limitation, any
employees of the Divisions and Subsidiaries, any participant in any Benefit Plan
or any beneficiary thereof.

     (d)   The Purchaser agrees that it shall be responsible for all termination
and severance payments with respect to employees of the Divisions and
Subsidiaries (including the employees listed on Schedule 6.3(e)(I) who become
employees of Purchaser on the Closing Date, but excluding the employees listed
on Schedule 6.3(e)(II) and the employees listed on Schedule 6.3(e)(I) who do not
become employees of Purchaser on the Closing Date) arising on account of events
occurring after the Closing Date.

     6.4  Full Access.  From and after the Closing Date, Purchaser shall cause
the Subsidiaries and Divisions to afford Seller and its counsel, accountants and
other authorized representatives, with two days' prior notice, reasonable access
during normal business hours (when accompanied by an authorized representative
of the Subsidiaries and Divisions) to the respective premises, properties,
personnel, books and records of the Subsidiaries and Divisions and any other
assets or information that Seller reasonably deems necessary to prepare the
Closing Balance Sheet and any report or return required to be filed by Seller
including, without limitation, any tax return.  Personnel of the Subsidiaries
and Divisions shall assist Seller in the preparation of the Closing Balance
Sheet; however, Seller shall not be obligated to compensate such personnel,
Purchaser or Subsidiaries and Divisions for such assistance.

     6.5  Insurance.  Purchaser will comply with its obligations under the
Insurance Agreement as if such obligations were set forth fully herein.

     6.6  Use of Name.  Purchaser shall refrain, and shall cause its Affiliates
to refrain, from using the name "Wheelabrator" or any derivation thereof, except
in accordance with the provisions of the "TRADE NAME AND SERVICE MARK LICENSE
AGREEMENT" to be executed by the parties in the form of Exhibit D hereto.

                                     -35-
<PAGE>

     6.7   HSR Filings.  As promptly as practicable, Purchaser shall (in
cooperation with Seller) make all filings and submissions under the HSR Act and
any foreign competition, investment, foreign exchange, tax or other foreign
laws.

     6.8   Litigation Support and Access After Closing.  In the event and for so
long as Seller or any of its Affiliates is a party to any action, suit,
proceeding, hearing, investigation, complaint, claim or demand ("LITIGATION") in
connection with (i) any transaction contemplated under this Agreement or (ii)
any fact, situation, circumstance, status, condition, activity, practice, plan,
occurrence, event, incident, action, failure to act, or transaction on, prior to
or after the Closing Date, involving the Business, the Domestic Assets or the
Subsidiaries, Purchaser will cooperate with Seller and its counsel, make
available its personnel, and provide such testimony and access to its books and
records as shall be necessary in connection with the Litigation.  Purchaser
acknowledges and agrees that, from and after the Closing, Seller will be
entitled to possession of all documents, books, records, agreements, and
financial data of any sort relating exclusively to the Excluded Assets or
Retained Liabilities, to the extent that such items are in Purchaser's control.

     6.9  Parent Guarantees.  Purchaser will use its best efforts to obtain the
release of all Parent Guarantees as of the Closing Date, whether by substituting
its own credit or guarantee therefor, or otherwise.  In the event that any
Parent Guarantees nevertheless remain outstanding following the Closing Date,
Purchaser shall indemnify and hold harmless the Seller from any Losses or other
payments made or demanded to be made thereunder, and shall not take any action
that increases the amount of any Parent Guarantee.

     6.10  Knowledge.  Purchaser shall promptly inform Seller, by written
notice, of any breach of Seller's representations and warranties of which
Purchaser obtains knowledge.


                                  ARTICLE VII

                      CONDITIONS PRECEDENT TO OBLIGATIONS
                                  OF PURCHASER

     The obligation of Purchaser to purchase the Shares and Domestic Assets as
provided herein is, at the option of Purchaser, subject to satisfaction of each
of the following conditions precedent on or before the Closing Date:

     7.1   Warranties True.  The representations and warranties of Seller
contained herein shall be true and correct in all Material respects as of the
date of this Agreement and (except to the extent such representations and
warranties are made as of an earlier date, which representations and warranties
shall be true and correct in all Material respects at and as of such date) as of
the Closing Date as though made on and as of the Closing Date, in each case
giving effect to any updates of Schedules delivered by Seller to Purchaser
reflecting events occurring or arising

                                     -36-
<PAGE>
 
between the date of this Agreement and the Closing Date (which updates shall not
include any updates to Schedule 3.6, and shall not identify matters that are,
individually or in the aggregate, Materially adverse).

     7.2  Compliance with Agreements and Covenants.  Seller shall have performed
and complied with, in all Material respects, its obligations and agreements
hereunder.

     7.3  HSR Act.  All required notice and waiting periods under the HSR Act
shall have expired or otherwise been terminated.

     7.4  Injunctions.  No court or governmental authority shall have issued an
order which shall then be in effect restraining or prohibiting the completion of
the sale of any substantial part of the Domestic Assets and the Shares.

     7.5  Deliveries by Seller.  Seller shall be able to effect the deliveries
required pursuant to Section 9.2 below.

     7.6  No Material Adverse Change.  There shall not have occurred, between
the date of this Agreement and the Closing Date, any Material Adverse Change.
 
     7.7  Materiality Standard.  For purposes of Section 7.1 and Section 7.6
above (and only for such purposes), the parties agree that one or more
circumstances or events shall not be deemed to be "Material" if the aggregate
adverse economic effect of such circumstances or events does not exceed 10% of
the Purchase Price.  The parties agree that the 10% standard in this Section 7.7
shall not be an admission on the part of either of them that any other issues
involving an interpretation of the term "material" or any derivation thereof as
it appears other than in Section 7.1 or Section 7.6 hereof shall be addressed in
the context of such standard, and the parties expressly and forever covenant and
agree that they will not use this Section 7.7 in making any such interpretation.


                                 ARTICLE VIII

                 CONDITIONS PRECEDENT TO OBLIGATIONS OF SELLER

     The obligation of Seller to cause the sale of the Shares and the Domestic
Assets as provided herein is, at the option of Seller, subject to the
satisfaction of each of the following conditions precedent on or before the
Closing Date:

     8.1  Warranties True.  The representations and warranties of Purchaser
contained herein shall be true and correct in all Material respects as of the
date of this Agreement and (except to the extent such representations and
warranties are made as of an earlier date, which representations and warranties
shall be true and correct in all Material respects at and as of such

                                     -37-
<PAGE>
 
date) as of the Closing Date as though made on and as of the Closing Date, in
each case except for changes expressly contemplated by this Agreement.

     8.2  Compliance with Agreements and Covenants.  Purchaser shall have
performed and complied with, in all material respects, its obligations and
agreements hereunder.

     8.3  HSR Act.  All required notice and waiting periods under the HSR Act
shall have expired or been waived.

     8.4  Injunctions.  No court or governmental authority shall have issued an
order which shall then be in effect restraining or prohibiting the completion of
the sale of any substantial part of Domestic Assets and the Shares.

     8.5  Deliveries by Purchaser.  Purchaser shall be able to effect the
deliveries required pursuant to Section 9.3 below.


                                   ARTICLE IX

                                    CLOSING

     9.1  Closing.  The Closing shall take place at the offices of Mayer, Brown
& Platt, 190 South LaSalle Street, Chicago, Illinois 60603 at 10:00 A.M. on or
as of the last business day of a calendar month.  The Closing shall take place
within 10 days of the date on which all of the conditions precedent set forth in
Article VII and Article VIII have been satisfied or waived, or such other date
as is mutually agreeable to Seller and Purchaser (the "CLOSING DATE").

     9.2  Seller's Deliveries.  At the Closing, Seller shall deliver to
Purchaser:

          (a) a certificate, signed by an officer of Seller, certifying
     satisfaction of the condition at Section 7.1 above;

          (b) certificates evidencing the Shares, duly endorsed in blank or
     accompanied by duly executed stock powers or ordres de mouvement, notarial
     deeds and/or such other transfer documents as may be necessary to transfer
     to Purchaser the Shares;

          (c) resignations of the respective Boards of Directors and officers of
     each of the Subsidiaries (other than the Minority Subsidiaries) as shall be
     designated by Purchaser in writing not less than five (5) days prior to the
     Closing Date;

          (d) a duly executed copy of the Trade Name and Service Mark License
     Agreement;

                                     -38-
<PAGE>
 
          (e) a bill of sale, deeds and instrument of assignment and other
     instruments reasonably deemed necessary by Purchaser for the conveyance of
     the Domestic Assets;

          (f) an assignment of all transferable licenses or permits included in
     the Domestic Assets;

          (g) a duly executed copy of the Business Development Agreement in the
     form of Exhibit E hereto;

          (h) updates of Seller's Schedules to this Agreement reflecting events
     occurring or arising between the date of this Agreement and the Closing
     Date (which Schedules shall supplement the Schedules attached hereto but
     shall not include any updates of Schedule 3.6, and shall not identify
     matters that are, individually or in the aggregate, Materially adverse);

          (i) a duly executed copy of the Insurance Agreement;

          (j) a duly executed copy of the Stock Retention Agreement, if
     required;

          (k) a duly executed copy of the Non-Competition Agreement;

          (l) documentation reasonably acceptable to Purchaser, making available
     to Purchaser the right to use the JD Edwards software currently utilized by
     Seller in the conduct of the Business;

          (m) any other items required to be delivered by Seller under the terms
     and provisions of this Agreement; and

          (n) any releases obtained of the Parent Guarantees.

     9.3  Purchaser's Deliveries.  At the Closing, the Purchaser shall deliver
to Seller:

          (a) a certificate, signed by an officer of Purchaser, certifying
     satisfaction of the condition at Section 8.1 above;

          (b) confirmation of the wire transfer to Seller of same-day funds in
     the amount of the Purchase Price;

          (c) a duly executed copy of the Trade Name and Service Mark License
     Agreement;

          (d) a duly executed copy of the Business Development Agreement;

                                     -39-
<PAGE>
 
          (e) a duly executed copy of the Non-Competition Agreement;

          (f) a duly executed copy of the Insurance Agreement;

          (g) a duly executed copy of the Stock Retention Agreement, if
     required;

          (h) a certificate, signed by a duly authorized officer of Purchaser on
     behalf of Purchaser, certifying that Purchaser has no knowledge of any
     breach of, or inaccuracy in, any of the representations and warranties of
     Seller set forth in this Agreement, except as set forth in such certificate
     (it being understood that upon delivery of such certificate, the contents
     thereof shall be deemed to be a representation and warranty of Purchaser);

          (i) assumption agreement, relating to the assumption by Purchaser of
     the Liabilities;

          (j) notarial deeds and/or such other transfer documents as may be
     necessary to transfer to Purchaser the Shares of certain of the
     Subsidiaries;

          (k) a duly executed copy of the Non-Competition Agreement;

          (l) any other items required to be delivered by Purchaser under the
     terms and provisions of this Agreement; and

          (m) any releases obtained of the Parent Guarantees.

     9.4  Termination.  This Agreement shall terminate:

          (a) upon the mutual agreement of Seller and Purchaser;

          (b) upon written notice from Purchaser to Seller if each of the
     conditions precedent set forth in Article VII has not been satisfied on or
     before December 31, 1996; or

          (c) upon written notice from Seller to Purchaser if each of the
     conditions precedent set forth in Article VIII has not been satisfied on or
     before December 31, 1996.

No termination of this Agreement shall release Seller from any liability under
Section 5.9.  No party shall be relieved of liability for any breach of this
Agreement, unless such breach is otherwise excused by the express terms hereof.
Sections 5.6, 6.2, 12.1 and 12.14 shall survive the termination of this
Agreement.

                                     -40-
<PAGE>
 
                                   ARTICLE X

                         SURVIVAL AND INDEMNIFICATION

          10.1  Survival.  The representations and warranties of the parties
contained herein or in any certificate or writing delivered pursuant hereto
shall survive the Closing until the first anniversary of the Closing Date;
provided, that, the representations and warranties contained at the last
sentence of Section 3.2(a) and the first sentence of Section 3.6(b) shall
survive the Closing forever.  The covenants and agreements contained herein
shall survive the Closing for the period designated or, if no period is so
designated, forever.

          10.2  Indemnification by Seller.  (a)  Subject to the terms of Section
10.3, Seller agrees to indemnify, defend and hold harmless Purchaser, its
officers, directors, Affiliates, successors and assigns (the "PURCHASER
INDEMNIFIED PARTIES") against any and all Losses suffered by any Purchaser
Indemnified Party from and after the point at which such Losses in the aggregate
exceed $2,000,000 (at which point Seller shall indemnify Purchaser for all such
Losses, beginning from the first dollar of such Losses) and

          (i)   are caused by any breach of the representations, warranties,
     covenants (including, without limitation, Seller's failure to pay, perform
     and satisfy the Retained Liabilities) or agreements of Seller set forth in
     this Agreement, or

          (ii)  constitute Reserve Losses (as defined below), or

          (iii) result from a claim or cause of action brought by Betz Dearborn
     with respect to the matters identified on Schedule 2.1(b)(II);

provided, that, (A) no claim may be made, and no Losses shall be applied against
the foregoing deductible amount, with respect to any matter that individually
does not cause a Loss in excess of $50,000, exclusive of attorney's fees, court
costs and costs of litigation; (B) the foregoing $50,000 and $2,000,000
limitations will not apply to Seller's obligations with respect to the Insurance
Agreement (or any other agreement entered into in connection therewith),
Seller's payment obligation under Section 2.3(c) above, any breach of the
representations and warranties contained in the last sentence of Section 3.2(a),
the first sentence of Section 3.6(b), or Section 3.12 or any Losses incurred
with respect to the Retained Liabilities (other than the Retained Claims, as to
which such limitations shall apply); and (C) Purchaser's right of recovery for
Reserve Losses is subject to Section 10.2(b) below; and provided, further, that
Purchaser shall not be entitled to indemnification pursuant to Section
10.2(a)(i) above in respect of Reserved Matters, it being understood that the
parties' agreement with respect to indemnification for Reserved Matters is set
forth in Section 10.2(a)(ii).

     (b)  On or before the first anniversary of the Closing Date, Purchaser may
assert claims for aggregate Losses incurred in respect of Reserved Matters, to
the extent that such

                                     -41-
<PAGE>
 
aggregate Losses exceed the aggregate amount of the Reserves (the "RESERVE
LOSSES").  Purchaser shall assert any such claim by written notice to Seller,
which notice must be delivered on or before the first anniversary of the Closing
Date.  Purchaser's claim notice shall specify, in reasonable detail, (i) the
aggregate amount of Losses incurred in respect of Reserved Matters and (ii) the
reason that Purchaser asserts that the total Reserves were not established as of
the Closing Date on a basis consistent with the Balance Sheet and in accordance
with the Accounting Conventions.  Purchaser shall be entitled to indemnification
with respect to the claimed Losses (A) only if it prevails on its assertion that
the Reserves were not established on a basis consistent with the Balance Sheet
and in accordance with the Accounting Conventions, and (B) only to the extent
that such Losses would have been covered by the Reserves, had the Reserves been
so established.

     (c) In addition to the indemnification obligations set forth in Section
10.2(a) above, Seller agrees to indemnify, defend and hold harmless the
Purchaser Indemnified Parties against 50% of any and all Losses (which, for
purposes of this Section 10.2(c) only, shall include project costs net of
project billings after the Closing Date) suffered by any Purchaser Indemnified
Party, without application of the $50,000, $2,000,000, 10% or one-year
limitations set forth elsewhere in this Section 10.2, arising from or relating
to (i) a salt crystallization system being installed for FRIMA, B.V., and (ii)
the HPD Division's Sudwestdeutsche Saltwerk project; provided, that the
foregoing indemnity shall only be applicable to the extent that the aggregate
Losses suffered by the Purchaser Indemnified Parties with respect to items (i)
and (ii) above exceed the estimated costs-to-complete, net of remaining
billings, for such projects as reflected in the calculation of earned revenues
for such projects on the books of HPD as of August 31, 1996.

     10.3  Limitations.  The aggregate liability of Seller to the Purchaser
Indemnified Parties under Section 10.2 or otherwise under this Agreement, or of
Purchaser to the Seller Indemnified Parties under Section 10.4(a) (but only with
respect to a breach of the representations and warranties set forth in Sections
4.1, 4.2 or 4.3) shall not exceed ten percent (10%) of the Purchase Price, as
such Purchase Price is finally determined in accordance with the procedures set
forth in Section 2.3; provided, that, such limitation shall not apply with
respect to any obligation of Seller under the Insurance Agreement (or any other
agreement entered into in connection herewith), payment obligations of Seller
set forth at Section 2.3(c) above, any breach of Section 3.12, the indemnity set
forth in Section 10.2(c) above or any Losses incurred with respect to the
Retained Liabilities (other than the Retained Claims, as to which such
limitation shall apply) by Purchaser or any Losses incurred with respect to the
Liabilities or the Parent Guarantees by Seller.  No claim for indemnification
may be made hereunder unless written notice of such claim, in reasonable detail,
is given to Seller or Purchaser, as the case may be, on or prior to the
expiration of the survival period set forth in Section 10.1.  The
indemnification provided by Section 10.2 shall not apply in the case of any
breach of any representation or warranty of which Purchaser had knowledge prior
to the Closing.  The rights and remedies set forth in this Article X shall
constitute the sole and exclusive rights and remedies of Seller and any Seller
Indemnified Party against Purchaser and Purchaser and any

                                     -42-
<PAGE>
 
Purchaser Indemnified Party against Seller with respect to this Agreement, the
events giving rise to this Agreement and the transactions contemplated herein.

     10.4  Indemnification by Purchaser.  Purchaser agrees to indemnify, defend
and hold harmless Seller, its officers, directors, Affiliates, successors and
assigns (the "SELLER INDEMNIFIED PARTIES") against any and all Losses suffered
by any Seller Indemnified Party and which:

          (a) are caused by any breach of the representations, warranties,
     covenants or agreements of Purchaser set forth in this Agreement including,
     without limitation, Purchaser's failure to pay, perform and satisfy, and
     hold Seller and its Affiliates harmless from, the Liabilities;

          (b) arise under any of the Parent Guarantees; or

          (c) otherwise arise from the operation of the Business, the Divisions,
     the Subsidiaries or the Domestic Assets from and after the Closing Date.

     10.5  Procedures.  The indemnified party shall promptly notify the
indemnifying party in writing of all matters which may give rise to the right to
indemnification hereunder.  If the indemnifying party does not receive notice of
any matter known to the indemnified party and as to which the indemnified party
is entitled to indemnification hereunder in time to contest the determination of
any such liability, the indemnifying party shall not be obligated to indemnify
the indemnified party with respect thereto, to the extent that such delay is
actually prejudicial to the rights or obligations of the indemnifying party.
The indemnifying party shall have the right:  (a) with the consent of the
indemnified party, which shall not be unreasonably withheld or delayed, to
settle all indemnifiable matters related to claims by third parties which are
susceptible to being settled and (b) to defend through counsel of its own
choosing, at its own expense, any action which may be brought by a third party
in connection therewith.  The indemnified party shall have the right to have its
counsel participate fully in such defense at its own expense but shall have no
right to settle any indemnifiable matter without the written consent of the
indemnifying party.  The indemnified party and the indemnifying party shall keep
each other reasonably informed of the progress of any litigation or settlement
negotiations with third parties in connection with a matter indemnified against
hereunder.  The indemnifying party and the indemnified party shall permit each
other reasonable access to books and records and otherwise cooperate with all
reasonable requests of each other in connection with any indemnifiable matter
resulting from a claim by any third party.

     10.6  Calculations.  The amount of indemnity payable under Section 10.2 or
Section 10.4 above shall be reduced by proceeds received by the Purchaser
Indemnified Party or the Seller Indemnified Party, as the case may be, from
insurance policies or other indemnities covering the damage, loss, liability or
expense that is the subject of the claim for indemnity.  To the extent that
insurance proceeds are received in a year other than the year in which the
indemnity

                                     -43-
<PAGE>
 
is paid, the indemnified party shall make a payment to the indemnifying party in
the amount of such insurance proceeds in the year in which they are received.


                                   ARTICLE XI

                                     TAXES

     11.1  Filing Tax Returns; Payment of Taxes.  (a)  As soon as practicable
after the Closing Date, Seller will prepare and file all appropriate tax returns
for the operations of the Subsidiaries (other than the Minority Subsidiaries)
for all tax periods ending on or before the Closing Date, including, for those
jurisdictions and tax authorities that permit or require a short period tax
return, for the period ending on the Closing Date, and Seller will pay any tax
due thereon and will indemnify the Purchaser for any such taxes and for any
taxes imposed by reason of section 1502-6 of the Treasury regulations or similar
provisions under state, local or foreign Law.  In the case of a jurisdiction
that does not permit a short period tax return with respect to a subsidiary
incorporated in the United States, the Closing Date will be treated as the end
of the subsidiary's taxable year and the Seller will pay any taxes that would be
due for such hypothetical taxable year.  Any item that would affect the
determination of taxes for this hypothetical taxable year that cannot be
identified as being attributable to the time prior to the Closing Date, will be
allocated pro rata throughout the Subsidiary's entire taxable year.  Without
undue disruption to the operations of such Subsidiaries, Purchaser shall cause
the Subsidiaries to cooperate fully and promptly in connection with Seller's
preparation and filing of such returns.  The books and records of the
Subsidiaries will be maintained, and the Federal, state and other income tax
returns of Seller's consolidated group will be filed, so as to accurately
reflect the operations of the Subsidiaries through the end of the Closing Date.
Seller shall have no responsibility for filing any tax return for the operations
of the Subsidiaries for any period ending after the Closing Date.

     (b) Seller shall be entitled to any refunds of Taxes (including interest
received thereon) paid with respect to the operations of the Subsidiaries for
any period included in the Seller Tax Period, except for any such refunds
reflected on the Closing Balance Sheet.  Purchaser shall be entitled to all
other refunds of Taxes (including interest received thereon) with respect to the
operations of the Subsidiaries.  Refunds to which Seller is not entitled shall
be retained by the Subsidiaries, and shall not be paid to Seller, and if
received by Seller, shall be paid over to Purchaser within ten (10) business
days after receipt.  Purchaser shall cause the Subsidiaries to cooperate, at no
cost to Purchaser, with Seller in any petition for or proceeding relating to any
refund.

     11.2  Tax Benefits.  If, as the result of a final determination or other
action by any taxing authority, the tax liability of any Subsidiary for a period
after the Closing Date is increased because of the erroneous timing of an item
of income, deduction, or credit which, when corrected, produces a realized tax
benefit available to Seller or any of its Affiliates in a tax

                                     -44-
<PAGE>
 
period including or ending before the Closing Date, Seller shall pay to
Purchaser upon its receipt or application of all or any portion of such tax
benefit an amount equal to the amount of such tax benefit or portion thereof
(including any interest related thereto).  If, as the result of a final
determination or other action by any taxing authority, the tax liability of any
Subsidiary for a period prior to the Closing Date is increased because of the
erroneous timing of an item of income, deduction, or credit which, when
corrected, produces a tax benefit available to Purchaser or any of its
Affiliates in a tax period beginning after the Closing Date, Purchaser shall pay
to Seller upon its receipt or application of all or any portion of such tax
benefit an amount equal to the amount of such tax benefit or portion thereof
(including any interest related thereto).

     11.3  Tax Cooperation.  Purchaser and Seller will cooperate fully with each
other in connection with (a) the preparation and filing of any Federal, state,
local or foreign tax returns for the operations of the Subsidiaries within the
Seller Tax Period, and (b) any audit examination by any government taxing
authority of the returns referred to in clause (a).  Such cooperation shall
include, without limitation, the furnishing or making available of records,
books of account or other materials of the Subsidiaries necessary or helpful for
the defense against assertions of any taxing authority as to any tax returns
which include operations of the Subsidiaries within the Seller Tax Period.
However, nothing herein shall entitle Purchaser to interfere with Seller's right
to make any judgments or to take any actions it deems appropriate in connection
with the disposition of any audits.  Seller shall control, and have the sole
right to contest or settle, any audit or other tax matter attributable to the
Seller Tax Period.

     11.4  Section 338(h)(1) Election.  If the Purchaser requests, Seller will
join with the Purchaser in making timely elections under Section 338(h)(10) of
the Code (and any corresponding elections under state or local Tax law)
(collectively, the "SECTION 338(H)(10) ELECTIONS") with respect to the purchase
and sale of the Shares of Wheelabrator Water Technologies International Holdings
Inc.  Initial drafts of the materials required to make such joint elections will
be prepared by Seller.  Purchaser and Seller shall (i) take, and cooperate with
each other to take, all actions necessary and appropriate to effect and preserve
the timely Section 338(h)(10) Elections in accordance with Section 338 of the
Code and the Treasury Regulations thereunder and (ii) Purchaser and Seller shall
report the sale of such shares pursuant to this Agreement consistent with the
Section 338(h)(10) Elections and shall take no position contrary thereto or
inconsistent therewith in any Tax return, any discussion with or proceeding
before any governmental authority, or otherwise.  The allocation of the
"adjusted grossed-up basis" (within the meaning of Treas. Reg. (S) 1.338(b)-
1(c)) among the tangible and intangible assets (the "ALLOCATION") market values
of such assets as agreed upon by the Purchaser and the Seller.  The Allocation
shall be used by Seller and Purchaser for purposes of allocating the "deemed
selling price" and neither party shall file any Tax return or schedule that is
inconsistent with the Allocation.  Seller shall be responsible for and shall
indemnify and hold Purchaser harmless from any Taxes that arise from or as a
result of the Section 338(h)(10) Election.

                                     -45-
<PAGE>
 
     11.5  Tax Sharing Arrangements.  Any tax sharing arrangement between the
Seller or its Affiliates, on the one hand, and any of the Subsidiaries, on the
other hand, will be null and void immediately following the Closing.


                                  ARTICLE XII

                                 MISCELLANEOUS

     12.1  Expenses.  Except as provided below, each party hereto shall bear its
own expenses with respect to this transaction.  The parties shall jointly share
any sales, stamp, documentary, registration, recording, conveyancing, transfer
or similar taxes and notarial and filing fees applicable to the transfer of the
Domestic Assets and the Shares.  Purchaser shall bear the costs and expenses of
any title insurance.

     12.2  Amendment.  This Agreement may be amended, modified or supplemented
only in writing signed by each of the parties hereto.

     12.3  Notices.  Any written notice to be given hereunder shall be deemed
given:  (a) when received, if given in person or by courier; (b) on the date of
transmission, if sent by telex, telecopy or other wire transmission (receipt
confirmed); (c) three (3) days after being deposited in the U.S. mail, certified
or registered mail, postage prepaid; and (d) if sent by a nationally recognized
overnight delivery service, the day following the date given to such overnight
delivery service (specified for overnight delivery).  All notices shall be
addressed as follows:

     If to Seller, addressed as follows:

          Wheelabrator Water Technologies Inc.
          3003 Butterfield Road
          Oak Brook, IL  60521
          Attention:  General Counsel
          Telephone:  (630) 572-2422
          Facsimile:  (630) 572-1415

          with a copy to:

          Wheelabrator Technologies Inc.
          3003 Butterfield Road
          Oak Brook, IL  60521
          Attention:  General Counsel
          Telephone:  (630) 572-8840
          Facsimile:  (630) 218-1553
 

                                     -46-
<PAGE>
 
     If to Purchaser, addressed as follows:

          United States Filter Corporation                         40-004 Cook
          Street
          Palm Desert, California  92211
          Attention:  General Counsel
          Telephone:  (619) 340-0098
          Facsimile:  (619) 341-9368

          with a copy to:

          Kirkpatrick & Lockhart
          1500 Oliver Building
          Pittsburgh, Pennsylvania  15222
          Attention:  Janice C. Hartman, Esq.
          Telephone:  (412) 355-6444
          Facsimile:  (412) 355-6501

     12.4  Waivers.  The failure of a party to require performance of any
provision hereof shall not affect its right at a later time to enforce the same.
No waiver by a party of any term, covenant, representation or warranty contained
herein shall be effective unless in writing.  No such waiver in any one instance
shall be deemed a further or continuing waiver of any such term, covenant,
representation or warranty in any other instance.

     12.5  Counterparts.  This Agreement may be executed in counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

     12.6  Headings.  The headings preceding the text of Articles and Sections
of this Agreement and the Schedules and Exhibits thereto are for convenience
only and shall not be deemed part of this Agreement.

     12.7  Applicable Law.  This Agreement shall be governed by and construed
and enforced in accordance with the internal laws, and not the laws of
conflicts, of the State of Illinois.

     12.8  Assignment.  This Agreement shall be binding upon and inure to the
benefit of the parties and their respective successors and assigns; provided,
that no assignment of either party's rights or obligations may be made without
the written consent of the other party, which consent shall not be unreasonably
withheld or delayed.  Notwithstanding the foregoing, Purchaser may assign all
rights hereunder to any one or more wholly owned subsidiaries; provided that
Purchaser shall continue to be bound in all respects hereunder.

                                     -47-
<PAGE>
 
     12.9  No Third Party Beneficiaries.  This Agreement is solely for the
benefit of the parties hereto and no provision of this Agreement shall be deemed
to confer any remedy, claim or right upon any third party.

     12.10  Arbitration.  All disputes arising in connection with this Agreement
or any modification or extension hereof, or the breach or invalidity hereof
(OTHER THAN DISPUTES RELATING TO THE TERMINATION OF THIS AGREEMENT OR THE
FAILURE TO CLOSE) shall be settled by binding arbitration in Chicago under the
UNCITRAL arbitration rules in effect on the date hereof, such arbitration to be
conducted by a single arbitrator appointed by the parties or, failing agreement
within one month of the demand for arbitration, by the American Arbitration
Association (AAA) at the request of one of the parties.  The AAA shall
administer the arbitration under its "Procedure for Cases under the UNCITRAL
Arbitration Rules."

     In addition to the rules governing such arbitration, the parties shall have
at their disposal the pretrial discovery rights as are then available under
applicable law; provided that any dispute between the parties relating to
discovery shall be submitted to the arbitrator for resolution.

     The arbitrator may, for his convenience or that of the parties, take
evidence at places other than Chicago without changing the situs of the
proceedings.  The arbitrator shall dispose of any dispute in such manner as he,
in his discretion, shall determine, but in so doing he shall be required to
receive the submission of the parties with respect to said dispute.  The
arbitrator shall base his award with respect to the matter before him on the
contents of this Agreement and on the provisions of the applicable law as herein
provided.  The decision of the arbitrator shall be rendered in writing with all
reasonable expedition and shall be final and binding on the parties hereto.
Judgment upon the arbitration award rendered may be entered in any court having
jurisdiction, or application may be made to any such court for judicial
acceptance of the award and an order of enforcement of execution, as the case
may be.

     12.11  Schedules.  Purchaser agrees that any disclosure by Seller in any
Schedule attached hereto shall constitute a disclosure under each other Schedule
referred to herein, whether or not such disclosure is specifically referenced
within such other Schedule.  The parties also acknowledge that an effect of this
Amended and Restated Purchase and Sale Agreement is to amend and restate, in
their entirety, Schedules 2.1(d), 2.3, 3.2 and 3.16, in the form attached
hereto; all other Schedules shall be in the form delivered on September 14,
1996.

     12.12  Incorporation.  The respective Schedules and Exhibits attached
hereto and referred to herein are incorporated into and form a part of this
Agreement.

     12.13  Knowledge Defined.  For purposes of this Agreement, the term
"KNOWLEDGE OF SELLER" or variations thereof shall be limited to the actual
knowledge of those individuals listed on Schedule 12.13(a), and the term
"KNOWLEDGE OF PURCHASER" or variations thereof shall be limited to the actual
knowledge of those individuals listed on Schedule 12.13(b); and the

                                     -48-
<PAGE>
 
knowledge of each shall reflect due inquiry by such individuals in connection
with the statement qualified by such knowledge.

     12.14  Public Announcements.  Seller and Purchaser each agree that they and
their Affiliates will not issue any press release with respect to this Agreement
or the transactions contemplated hereby without the prior approval of other
party, which shall not be unreasonably withheld, except as may be required by
Law or by any stock exchanges having jurisdiction over Seller, Purchaser or
their Affiliates.

     12.15  Complete Agreement.  This Agreement constitutes the complete
agreement of the parties with respect to the subject matter hereof and
supersedes all prior discussions, negotiations and understandings.  The preamble
and recitals set forth at the beginning of this Agreement are incorporated in
and form a part of this Agreement.

     12.16  Interpretation.  When a reference is made in this Agreement to
Sections, such reference shall be to a Section of this Agreement unless
indicated.  Whenever the words "include," "includes" or "including" are used in
this Agreement they shall be deemed to be followed by the words "without
limitation," whether or not expressly stated.

     12.17  Further Assurances.  Each of the parties hereto agrees to use its
commercially reasonable efforts, both before and after the Closing, to take, or
cause to be taken, all action, and to do, or cause to be done, all things
necessary, proper or advisable under applicable Laws and existing agreements or
otherwise required to be taken or done by it to consummate the transactions
contemplated hereby and to more fully and effectively vest in Purchaser title to
the Domestic Assets and the Shares.

                                     -49-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first written above.


                              WHEELABRATOR TECHNOLOGIES INC.



                              By:
                                 -------------------------------
                              Name:  William Keightley
                              Title:  Authorized Representative


                              UNITED STATES FILTER CORPORATION



                              By:
                                 -------------------------------
                              Name:  Kevin L. Spence
                              Title:  Vice President and Chief
                                      Financial Officer

                                     -50-

<PAGE>

                                                                     Exhibit 2.2
 
                            AGREEMENT AND AMENDMENT
                            -----------------------


     This Agreement and Amendment ("AGREEMENT") is made this 2nd day of
December, 1996, between Wheelabrator Technologies Inc., a Delaware corporation
("SELLER"), and United States Filter Corporation, a Delaware corporation
("PURCHASER").

                                   RECITALS
                                   --------

     A. Seller and Purchaser are parties to that certain Amended and Restated
Purchase and Sale Agreement dated as of September 14, 1996 (the "SALE
AGREEMENT").

     B. Seller and Purchaser wish to enter into this Agreement to (1) provide
for additional agreements regarding certain matters relating to the Sale
Agreement and (2) amend the Sale Agreement in certain respects.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is acknowledged, the parties agree as follows:

     1. Incorporation. Any capitalized term not otherwise defined in this
Agreement shall have the meaning given such term in the Sale Agreement. The
preamble and recitals set forth above are incorporated into and form a part of
this Agreement.

     2. Alloy Castings; Darchet (Thailand). Prior to the Closing, Seller shall
cause the appropriate Subsidiaries to transfer or dividend to an entity
designated by Seller (a) ownership of beneficial title to all capital stock held
by such Subsidiaries in (i) Wheelabrator Alloy Castings Limited, a corporation
organized under the laws of India, and (ii) Darchet Industrial Water (Thailand)
Co. Ltd., a corporation organized under the laws of Thailand, (it being agreed
that legal title to all such capital stock described at Sections 2(a)(i) and
2(a)(ii) above shall thereafter be held by such Subsidiaries in trust for the
benefit of Seller and its Affiliates, until transfer of such legal title can be
effected), and (b) all rights of the plaintiffs in, under and to the following
actions: (i) Wheelabrator Water Technology (S) Pte. Ltd. vs. Darchet Industrial
Water (Thailand) Co., Ltd., Black Case No. Thor. Bor. 99/2539, and (ii) Darchet
Industrial Water Pte. Ltd. vs. Darchet Industrial Water (Thailand) Co., Ltd.,
Black Case No. 10519/2539 (items (b)(i) and (b)(ii) being referred to
collectively as the "DARCHET ACTIONS"). The term "Liabilities" shall not include
any liabilities of, or arising out of the ownership or operation of,
Wheelabrator Alloy Castings Limited or Darchet Industrial Water (Thailand) Co.,
Ltd., whether, absolute or contingent, known or unknown. All obligations and
liabilities of the plaintiffs under the Darchet Actions shall be deemed Retained
Claims for purposes of the Sale Agreement. The instruments of transfer,
assumption and trust necessary to effect the
<PAGE>
 
matters contemplated herein shall be substantially in the same form as the other
instruments of transfer and assumption between Seller and Purchaser pursuant to
the Sale Agreement. After the Closing, Purchaser and its Affiliates shall
cooperate with Seller and its Affiliates to effect transfer to an entity
designated by Seller, any right, title or interest to the capital stock of
Wheelabrator Alloy Castings Limited and Darchet Industrial Water (Thailand) Co.
Ltd. The foregoing transfers shall be made without any representations or
warranties of any nature whatsoever. Seller shall be responsible for any
governmental filing fees or governmental approval costs relating to such
transfer of legal title. At closing, the parties shall enter into an agreement
governing the parties respective post-closing rights and obligations with
respect to the capital stock in Wheelabrator Alloy Castings Limited and Darchet
Industrial Water (Thailand) Co. Ltd., which agreement shall be on the same terms
as the Stock Retention Agreement.

     3. Wheelabrator Canada. The capital stock of Wheelabrator Canada Inc., a
corporation organized under the laws of Ontario ("WCI"), shall be retained by an
Affiliate of Seller. Accordingly, the Sale Agreement is hereby amended as
follows:

     (a) The fourth and fifth sentences of Section 2.1(d) of the Sale Agreement
are deleted. The following is inserted into the Sale Agreement as the new second
paragraph of Section 2.1(d):

          "Prior to the Closing, Seller shall cause the following actions to be
     taken, in the order set forth below, with respect to Wheelabrator Canada
     Inc., a corporation organized under the laws of Ontario ("WCI"), and its
     wholly owned subsidiary, MPF Engineered Filtered Products Inc., a
     corporation organized under the laws of Ontario ("MPF"). (1) Wheelabrator
     Water Technologies International Holdings Inc., a Delaware corporation
     ("WWTH"), shall transfer or dividend to an entity designated by Seller (A)
     all of the capital stock in WCI owned by WWTH and (B) all right, title and
     interest in that certain unsecured promissory note dated May 3, 1996, of
     WCI in favor of WWTH in the principal amount of $15,000,000. (2) MPF shall
     dividend to WCI all of MPF's cash on hand (the "MPF DIVIDEND"). (3) WCI
     shall subscribe for shares in MPF in consideration of an amount payable in
     cash equal to the then current retained earnings of MPF less the amount of
     the MPF Dividend. (4) MPF shall issue to WCI shares of common stock, which
     shares shall be deemed to be fully paid and non-assessable upon issuance.
     (5) MPF shall issue a cash dividend to WCI in the amount of the
     consideration referred to at item (3) above. Upon completion of steps (1)
     through (5) above, prior to Closing, WCI shall, for consideration of the
     issuance of shares in a newly incorporated Canadian entity ("WCI II,
     INC."), transfer to WCI II, Inc., all of the MCS Assets and all of the
     issued and outstanding capital stock of MPF. The "MCS ASSETS" shall mean
     the assets used primarily in the operation of WCI's Material Cleaning
     Systems Division

                                      -2-
<PAGE>
 
     but excluding, specifically, all capital stock owned in Glegg Industries
     Inc., all rights and obligations under that certain Strategic Alliance
     Agreement and other agreements entered into in connection with the
     acquisition of the capital stock investment in Glegg Industries Inc., and
     all of the assets used in the Wheelabrator Air Pollution Control business.
     WCI II, Inc. shall assume all liabilities or obligations of, or claims
     against, WCI relating to the operation, ownership or use of the MCS Assets.
     The instruments of transfer and assumption necessary to effect the matters
     contemplated above shall be substantially in the same form as the other
     instruments of transfer between Seller and Purchaser pursuant to this
     Agreement.

     (b) The definition of "LIABILITIES" shall include all liabilities
(excluding all Retained Liabilities) of, or arising out of the ownership or
operation of, the MCS Assets, whether absolute or contingent, known or unknown,
including, without limitation, the liabilities, obligations and other matters
arising from the ownership, operation or use of the MCS Assets and described in
items (a) through (f) of the definition of "Liabilities" in Article I of the
Sale Agreement.

     (c) The definition of "SUBSIDIARY" and "SUBSIDIARIES" shall (i) exclude
WCI, and (ii) include WCI II, Inc.  WCI is hereby deleted from Schedule 1.4 to
the Sale Agreement.

     4.   The definition of "EXCLUDED ASSETS" include (i) the issued and
outstanding capital stock of WCI and that certain unsecured promissory note
dated May 3, 1996, of WCI in favor of WWTH in the principal amount of
$15,000,000, (ii) the assets of JFS (UK) Limited and the assets of any other
subsidiary or affiliate of Seller other than the Subsidiaries and WWTI and (iii)
the rights and obligations of JFS (UK) Limited under the UK Microfloc Contracts.

     5.  Welsh Water Claim.  Prior to closing, Seller shall cause the
appropriate Subsidiaries to transfer or dividend to an entity designated by
Seller all rights of the plaintiffs in, under and to the action Johnson
Filtration Systems Limited and Tilghman Wheelabrator Ltd. vs. Dwr. Cymru. Cys.
(a/k/a Welsh Water Co.), case no. 1996 ORB 799.  All obligations and liabilities
of the plaintiffs with respect to such action shall be deemed Retained Claims
for purposes of the Sale Agreement.  Purchaser agrees that any payment, award or
right granted plaintiffs in such action is the sole property of Seller and its
Affiliates.  After the Closing Purchaser shall cause the execution and delivery,
from time to time, of such documents as are reasonably requested by Seller to
evidence or perfect the assignment hereunder.

     5.   Closing Date.  The Closing shall occur on December 2, 1996.
Accordingly, the Sale Agreement is hereby amended in the following respects:

     (a) The definition of "Base Tangible Net Book Value" set forth in Article I
of the Sale Agreement is deleted in its entirety and replaced by the following:

          ""BASE TANGIBLE NET BOOK VALUE" means $113,600,000."

                                      -3-
<PAGE>
 
     (b)  Section 2.3 of the Sale Agreement is amended by:

          (i) deleting the first sentence thereof and replacing it with the
     following:

          "Within thirty (30) days following the Closing Date Seller shall
          deliver to Purchaser a consolidated balance sheet for the Business
          dated as of November 30, 1996 (the "Closing Balance Sheet")."

          (ii) deleting the fourth sentence thereof and replacing it with:

          "The Closing Balance Sheet shall not take into consideration any
          events occurring after November 30, 1996."

     (c)  Section 9.1 of the Sale Agreement is deleted in its entirety and
replaced by the following:

          "9.1  Closing.  The Closing shall take place at the offices of Mayer,
          Brown & Platt, 190 South LaSalle Street, Chicago, Illinois  60603 at
          10:00 a.m. on or as of December 2, 1996 (the "CLOSING DATE")."

     6.   Stock Transfers.  (a) At the Closing, the Shares shall be conveyed as
follows:

     (i)  the issued and outstanding capital stock of Johnson Filtration Systems
(France) S.A. shall be conveyed to USF France S.A.;

     (ii)  the issued and outstanding capital stock of Wheelabrator Technologies
(UK) Limited shall be conveyed to U.S. Filter/LaGrange, Inc.;

     (iii)  the issued and outstanding capital stock of Johnson Filtration
Systems (Ireland) Limited shall be conveyed to USF Euroholding S.A.;

     (iv)  the issued and outstanding capital stock of Johnson Filtration
Systems (Australia) Pty. Ltd. shall be conveyed to The Permutit Company Pty.
Ltd. (Australia);

     (v)  the issued and outstanding capital stock of Johnson Filtration Systems
(Japan) Ltd. shall be conveyed to USF Finance B.V. (Netherlands);

     (vi)  the issued and outstanding capital stock of Procesos y Systemas de
Separacion, S.A. shall be conveyed to USF Spain S.A.;

     (vii)  such issued and outstanding capital stock of Societe HPD S.A.
constituting, to Seller's knowledge, approximately 26.88% of such corporation's
issued and outstanding stock shall be conveyed to USF France S.A.;

     (viii)  the issued and outstanding capital stock of Wheelabrator Asia-
Pacific (Pte.) Ltd. shall be conveyed to U.S. Filter (Asia) Pte. Limited;

                                      -4-
<PAGE>
 
     (ix)  the issued and outstanding capital stock of Wheelabrator Water
Technologies International Holdings Inc. shall be conveyed to IP Holding
Company;

     (x)  the issued and outstanding capital stock of Wheelabrator Clean Air
Systems Inc. shall be conveyed to U.S. Filter Wastewater Group, Inc.;

     (xi)  such issued and outstanding capital stock of Johnson Filtration
Systems (India) Limited constituting, to Seller's knowledge, approximately 60%
of such corporation's issued and outstanding stock shall be subject to the Stock
Retention Agreement; and

     (xii)  such issued and outstanding capital stock of HPD/Evatherm A.G.
constituting, to Seller's knowledge, approximately 20% of such corporation's
issued and outstanding stock shall be conveyed to USF Euroholding, S.A.

     (b)  In addition to the conveyance set forth at Section 6(a) above, the
following conveyances shall be effected at the Closing:

     (i)  immediately after the completion of the conveyance described at
Section 6(a)(ii) above:

          (A)  the issued and outstanding capital stock of Wheelabrator Sisson
     Lehman S.A. shall be conveyed to Wheelabrator Technologies (UK) Limited,
     and

          (B)  the issued and outstanding quota of Wheelabrator-Berger
     (Maschinenfabriken) GmbH, with a nominal value of DM 2,999,200,
     constituting, to Seller's knowledge, 74% of such corporation's issued and
     outstanding capital stock, shall be conveyed to Wheelabrator Technologies
     (UK) Limited;

     (ii)  the issued and outstanding capital stock of WCI II, Inc. shall be
conveyed to U.S. Filter/LaGrange, Inc.;

     (iii)  immediately after the completion of the conveyance described at
Section 6(a)(ix) above, the issued and outstanding capital stock of RWB Beheer
B.V. shall be conveyed to USF Euroholding S.A.;

     (iv)  immediately after the completion of the conveyance described at
Section 6(a)(ix) above, the issued and outstanding capital stock of Wheelabrator
Water Technologies (s) Pte. Ltd. shall be conveyed to U.S. Filter (Asia) Pte.
Limited.

     (c)  At the Closing, Purchaser shall cause each entity receiving stock from
Seller or its Affiliates to execute and deliver to Seller an agreement to be
bound by the disclaimers set forth at the end of Article III of the Sale
Agreement and Purchaser's representations and warranties set forth at Section
4.3 of the Sale Agreement.  The delivery of such agreement shall be deemed to be
a closing delivery required by Section 9.3 of the Sale Agreement.

                                      -5-
<PAGE>
 
     7. Insurance Agreement. The Insurance Agreement in the form of Exhibit A to
this Agreement replaces and supersedes, in all respects, the form of such
agreement set forth on Exhibit A to the Sale Agreement. At the Closing, the
parties shall execute and deliver the Insurance Agreement in the form set forth
on Exhibit A to this Agreement.

     8. Closing Documents. At the closing, the parties shall execute and deliver
the following:

          (a)  the Transition Services Agreement in the form of Exhibit B
     hereto;

          (b)  the Escrow Agreement in the form of Exhibit C hereto (which shall
     be the escrow agreement required by Section 2.2(b) of the Sale Agreement).

     9. Construction. The Sale Agreement, as amended by this Agreement,
continues in full force and effect. If any provision of this Agreement is
inconsistent with the Sale Agreement, such provision of this Agreement shall
govern and control.

     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first written above.


                                       WHEELABRATOR TECHNOLOGIES INC.



                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------



                                       UNITED STATES FILTER CORPORATION


                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------
                                      -6-


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