Document:

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                                                                     EXHIBIT 4.4

                              WASTE SERVICES, INC.

                       CAPITAL ENVIRONMENTAL RESOURCE INC.

                        PREFERRED SUBSCRIPTION AGREEMENT

                                   MAY 6, 2003

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                                TABLE OF CONTENTS

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<Caption>
                                                                   PAGE
                                    ARTICLE I
                   Authorization and Sale of the Securities

<S>   <C>
1.1   Authorization of the Securities................................ii
1.2   Sale of the Initial Securities................................iii
1.3   Sale of the Subsequent Securities.............................iii
1.4   Valuation.......................................................v

                                   ARTICLE II
                             Closing Date; Delivery

2.1   Closing Date....................................................v
2.2   Subsequent Closing Dates........................................v
2.3   Delivery........................................................v

                                   ARTICLE III
  Representations and Warranties of the US Company and the Canadian Company

3.1   Organization and Standing......................................vi
3.2   Corporate Power...............................................vii
3.3   Subsidiaries..................................................vii
3.4   Capitalization...............................................viii
3.5   Authorization; Consents, etc...................................ix
3.6   Reports; Financial Statements..................................xi
3.7   Outstanding Debt...............................................xi
3.8   Absence of Liabilities.........................................xi
3.9   Absence of Certain Changes....................................xii
3.10  Taxes.........................................................xii
3.11  Employee Benefits; ERISA.....................................xiii
3.12  Contracts......................................................xv
3.13  Insurance.....................................................xvi
3.14  Affiliate Arrangements........................................xvi
3.15  Litigation....................................................xvi
3.16  Consents.....................................................xvii
3.17  Properties; Liens and Encumbrances...........................xvii
3.18  Leases.......................................................xvii
3.19  Environmental Matters.......................................xviii
3.20  Offering.......................................................xx
3.21  Compliance with Other Instruments and Laws.....................xx
3.22  Employees......................................................xx
3.23  Brokers.......................................................xxi
3.24  Shareholder Approval..........................................xxi
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                                TABLE OF CONTENTS

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                                                                   PAGE

<S>   <C>
3.25  Rights Agreement..............................................xxi

                                   ARTICLE IV
               Representations and Warranties of the Purchasers

4.1   Organization and Authority of the Purchasers.................xxii
4.2   Experience...................................................xxii
4.3   Investment...................................................xxii
4.4   Consents....................................................xxiii
4.5   No Conflicts................................................xxiii

                                    ARTICLE V
                              Conditions to Closing

5.1   Mutual Closing Conditions...................................xxiii
5.2   Conditions to Closing of the Purchasers......................xxiv
5.3   Conditions to Closing of the US Company......................xxvi

                                   ARTICLE VI
                                   Agreements

6.1   Conduct of Business by the Companies; Updated Disclosure;
      Subsequent Acquisitions.....................................xxvii
6.2   Use of Proceeds............................................xxviii
6.3   Availability of Common Shares..............................xxviii
6.4   Listing of Conversion Shares...............................xxviii
6.5   Reporting Requirements Under the Exchange Act................xxix
6.6   Exchange Act Filings.........................................xxix
6.7   Migration....................................................xxix
6.8   Omni Operations..............................................xxxi
6.9   Special Meeting..............................................xxxi
6.10  Efforts to Consummate Transaction; Agreement to Cooperate....xxxi
6.11  Access; Notification of Certain Matters.....................xxxii
6.12  Termination.................................................xxxii
6.13  Effect of Termination......................................xxxiii
6.14  Confidential Information...................................xxxiii
6.15  Tax Covenants...............................................xxxiv
6.16  Joint and Several Liability..................................xxxv
6.17  Certificate of Designations.................................xxxvi
6.18  Dividends...................................................xxxvi
</Table>

                                   ARTICLE VII
                                 Indemnification

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                                TABLE OF CONTENTS

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                                                                   PAGE

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7.1   Indemnification by the Company..............................xxxvi
7.2   Indemnification by the Purchasers..........................xxxvii
7.3   Limitations on Indemnification.............................xxxvii
7.4   Notice and Defense of Claims...............................xxxvii
7.5   Exclusive Remedies........................................xxxviii
7.6   Limitation of Liability.....................................xxxix
7.7   Treatment as a Purchase Price Adjustment....................xxxix

                                  ARTICLE VIII
                                  Miscellaneous

8.1   Governing Law; Submission to Jurisdiction; Venue............xxxix
8.2   Survival.......................................................xl
8.3   Successors and Assigns.........................................xl
8.4   Entire Agreement; Amendment....................................xl
8.5   Notices.......................................................xli
8.6   Delays or Omissions..........................................xlii
8.7   Expenses.....................................................xlii
8.8   Titles and Subtitles........................................xliii
8.9   Counterparts................................................xliii
</Table>

SCHEDULES AND EXHIBITS
Schedule of Purchasers

<Table>
<S>         <C>   <C>
Exhibit A   -     Form of Certificate of Designations
Exhibit B   -     Form of Warrant Agreement and Warrant
Exhibit C   -     Description of Migration
Exhibit D   -     Forms of Opinions
Exhibit E   -     Form of Registration Rights Agreement
Exhibit F   -     Amendments for Canadian Company preferred shares
Exhibit G   -     Amendments for Canadian Company warrant
Exhibit H   -     Form of Penny Warrant Agreement and Warrant
</Table>

                                      iii

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                        PREFERRED SUBSCRIPTION AGREEMENT

      PREFERRED SUBSCRIPTION AGREEMENT, dated as of May 6, 2003 (the
"AGREEMENT"), among Waste Services, Inc. (the "US COMPANY"), a corporation
incorporated under the laws of the State of Delaware, Capital Environmental
Resource Inc., a corporation amalgamated under the laws of the Province of
Ontario, Canada (the "CANADIAN COMPANY"; the US Company and the Canadian Company
are sometimes referred to herein individually as a "COMPANY" and together as the
"COMPANIES"), Kelso Investment Associates VI, L.P., a Delaware limited
partnership ("KIA") and KEP VI, LLC, a Delaware limited liability company ("KEP"
and together with KIA, the "PURCHASERS").

                              W I T N E S S E T H:

      WHEREAS, the US Company and the Canadian Company have entered into a
Purchase Agreement, dated as of January 14, 2003, by and among each of them, and
certain holders of membership interests in Omni Waste of Osceola County LLC
("OMNI") as the other parties thereto, as amended pursuant to an Amendment to
Purchase Agreement, dated as of April 1, 2003 and as further amended pursuant to
a Second Amendment to Purchase Agreement, dated as of May 1, 2003, and a
Purchase Agreement, dated as of January 15, 2003, by and among each of them and
Donald F. Moorehead, Jr., as amended pursuant to an Amendment to Purchase
Agreement, dated as of February 14, 2003 (such agreements, together, as amended,
the "OMNI AGREEMENTS"), which together provide for the acquisition of 100% of
the membership interests of Omni;

      WHEREAS, in part to finance the acquisition of Omni pursuant to the Omni
Agreements as well as other potential acquisitions by the US Company and the
Canadian Company, the US Company wishes to issue and sell to the Purchasers, and
the Purchasers wish to purchase from the US Company, upon the terms and subject
to the conditions set forth herein, (i) certain authorized but unissued shares
of preferred stock of the US Company with a liquidation preference of $1,000 per
share plus accrued and unpaid dividends (subject to Section 6.7, the "PREFERRED
SHARES"), the rights and preferences of which are set forth in the Certificate
of Designations of the US Company (the "CERTIFICATE OF DESIGNATIONS") in the
form attached as EXHIBIT A hereto and (ii) warrants (subject to Section 6.7, the
"SHARE WARRANTS") to purchase authorized but unissued shares of common stock,
par value $0.01 per share, of the US Company (subject to Section 6.7, the
"COMMON SHARES") pursuant to a Warrant Agreement in the form attached as EXHIBIT
B hereto;

      WHEREAS, the issuance and sale contemplated by the immediately preceding
recital will be structured so that the US Company will issue and sell to the
Purchasers, and the Purchasers will purchase from the US Company, (i) 55,000
Preferred Shares and Share Warrants to purchase 7,150,000 Common Shares at the
Closing (as defined in

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Section 2.1) and (ii) up to an additional 45,000 Preferred Shares and Share
Warrants to purchase up to an additional 5,850,000 Common Shares at the
Subsequent Closings (as defined in Section 2.2), in each case subject to the
terms and conditions hereof;

      WHEREAS, the Canadian Company has issued and sold 10,075,000 Series 1
Preferred Shares (the "SERIES 1 PREFERRED SHARES"), and Warrants to purchase
2,015,000 common shares in the capital of the Canadian Company (the "SERIES 1
WARRANTS"), pursuant to that certain Series 1 Preferred Subscription Agreement,
dated as of March 31, 2003 (the "SERIES 1 SUBSCRIPTION AGREEMENT"), by and among
the Canadian Company and the purchasers of such securities set forth therein;

      WHEREAS, the Series 1 Preferred Shares sold pursuant to the Series 1
Subscription Agreement are automatically convertible into 10,075,000 common
shares in the capital of the Canadian Company (the "CANADIAN COMMON SHARES")
upon the Canadian Company obtaining shareholder approval for the conversion of
such Series 1 Preferred Shares (the "SHAREHOLDER APPROVAL"), such approval to be
sought as soon as practicable following the Closing; and

      WHEREAS, as soon as reasonably practicable following the Closing, the
Companies also intend to consummate a corporate reorganization by means of a
plan of arrangement, a description of which is set forth in EXHIBIT C hereto
(the "MIGRATION"), pursuant to which the Canadian Company will become an
indirect subsidiary of the US Company.

      NOW, THEREFORE, in consideration of the premises and the mutual agreements
and covenants hereinafter set forth, the Purchasers, the US Company and the
Canadian Company hereby agree as follows:

                                   ARTICLE I
                   AUTHORIZATION AND SALE OF THE SECURITIES

      1.1 AUTHORIZATION OF THE SECURITIES.

      (a) The US Company has authorized the issue and sale of (i) 55,000
Preferred Shares (subject to Section 6.7, the "INITIAL SHARES") and (ii) Share
Warrants to purchase 7,150,000 Common Shares for an initial exercise price of
$3.00 per Common Share (subject to Section 6.7, the "INITIAL WARRANTS," and,
together with the Initial Shares, the "INITIAL SECURITIES") for issue and sale
at the Closing, subject to the terms and conditions hereof.

      (b) The US Company has authorized the issue and sale of (i) 45,000
Preferred Shares (subject to Section 6.7, the "SUBSEQUENT SHARES") and (ii)
Share Warrants to purchase 5,850,000 Common Shares for an exercise price of
$3.00 per Common Share (subject to Section 6.7, the "SUBSEQUENT WARRANTS," and,
together with

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the Subsequent Shares, the "SUBSEQUENT SECURITIES") for issue and
sale at the Subsequent Closings subject to the terms and conditions hereof.

      (c) Subject to Section 6.7, the Initial Warrants together with the
Subsequent Warrants and the Share Warrants are hereinafter referred to as the
"WARRANTS." Subject to Section 6.7, the Warrants together with the Initial
Shares and the Subsequent Shares are hereinafter referred to as the
"SECURITIES." Subject to Section 6.7, the Common Shares issuable upon exercise
of the Warrants are hereinafter referred to as the "CONVERSION SHARES."
Notwithstanding anything herein to the contrary, the number of Subsequent Shares
and Subsequent Warrants and the purchase price therefore will be subject to
appropriate adjustment in the event of stock splits, stock combinations,
reclassifications and such other events as are set forth in the Certificate of
Designations and the Warrant Agreement, as the case may be.

      1.2 SALE OF THE INITIAL SECURITIES. Subject to the terms and conditions
hereof, and in reliance upon the representations, warranties and agreements
contained herein, the US Company will issue and sell to each Purchaser, and each
Purchaser will purchase from the US Company at the Closing, the number of
Preferred Shares and Warrants at the purchase price, in each case, set forth
opposite such Purchaser's name on the Schedule of Purchasers attached hereto
(the "SCHEDULE OF PURCHASERS") under the heading "Initial Purchases."

      1.3 SALE OF THE SUBSEQUENT SECURITIES.

      (a) If the US Company (or the Canadian Company following any Exchange
Event (as defined in Section 6.7)) desires to issue and sell Subsequent
Securities to the Purchasers at any time prior to the third anniversary of the
Closing Date, the US Company (or the Canadian Company following any Exchange
Event) shall notify the Purchasers in writing at least 20 days prior to any
proposed Subsequent Closing relating thereto and such notice may be accompanied
by an updated Schedule of Exceptions (as defined in Section 3) as contemplated
by Section 6.1(b) (any such notice, a "SUBSEQUENT CLOSING NOTICE"). Any such
Subsequent Closing Notice shall include the number of Subsequent Shares and
Subsequent Warrants that the US Company (or the Canadian Company following any
Exchange Event) proposes to sell to the Purchasers at such Subsequent Closing
and the proposed date and time of such Subsequent Closing; PROVIDED, however,
that, except as provided in Section 1.3(c), any such Subsequent Closing shall be
for a minimum aggregate of 10,000 Preferred Shares and the number of Subsequent
Warrants to be sold at such Subsequent Closing will be determined in accordance
with Section 1.3(b). Subject to the terms and conditions hereof, and in reliance
upon the representations, warranties and agreements contained herein, the US
Company (or the Canadian Company following any Exchange Event) will issue and
sell to each Purchaser, and each Purchaser will purchase at each Subsequent
Closing, up to the number of Subsequent Shares and Subsequent Warrants set forth
opposite such

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Purchaser's name on the Schedule of Purchasers under the heading "Subsequent
Purchases" on a pro rata basis between the Purchasers. At any Subsequent
Closing, the Purchasers shall make payments equal to $1,000 multiplied by the
number of Subsequent Shares purchased and sold.

      (b) Subject to the terms and conditions hereof, at any Subsequent Closing,
each Purchaser will purchase, and the US Company (or the Canadian Company
following any Exchange Event) will issue and sell to each Purchaser, all or a
portion of the remaining 45,000 Subsequent Shares together with a number of
Warrants equal to (x) prior to any Special Migration Closing (as defined in
Section 1.3(c)), 5,850,000 multiplied by the quotient of (i) the number of
Subsequent Shares to be issued and sold at such Subsequent Closing divided by
(ii) 45,000, or (y) from and after any Special Migration Closing, 5,300,000
multiplied by the quotient of (i) the number of Subsequent Shares to be issued
and sold at such Subsequent Closing divided by (ii) 45,000 less the Migration
Closing Share Number (as defined in Section 1.3(c)).

      (c) In the event that the Company determines in its reasonable discretion
that, in order for the shareholders who exchange shares in the Canadian Company
for shares in the US Company pursuant to the Migration not to recognize gain on
such shares for U.S. federal income tax purposes it is necessary for the
Purchasers to purchase additional Preferred Shares in connection with such
Migration, then, prior to any Exchange Event, the Company may issue a Subsequent
Closing Notice requiring the Purchaser to purchase for cash the following
additional Preferred Shares and Warrants: (i) the number of Preferred Shares to
be determined by the Company, but not to exceed an amount that equals the
quotient of (x) the aggregate Liquidation Preference (as defined in the
Certificate of Designations and subject to Section 3 thereof) on the date of the
Migration divided by (y) 10,000 (as such number will be adjusted in the same
manner as the purchase price for the Subsequent Shares may be adjusted as
provided herein) (such number, the "MIGRATION CLOSING SHARE NUMBER") and (ii)
550,000 Warrants. This Subsequent Closing will occur on the date of the
consummation of the Migration (such Subsequent Closing, the "SPECIAL MIGRATION
CLOSING"), and the Purchasers hereby waive all of the conditions that would
otherwise apply to the purchase and sale at such Special Subsequent Closing of
the Securities referred to in this Section 1.3(c), other than the conditions set
forth in Section 5.1 and clause (b) of Section 5.2.7. Notwithstanding anything
to the contrary herein, in the event that the Migration occurs after the
Migration Outside Date, but prior to an Exchange Event, the Migration Closing
Share Number shall be increased by an amount of Preferred Shares equal to the
sum of 10 percent of the fair market value of (A) any Common Shares held by the
Purchasers at the time of the Special Migration Closing and (B) any Common
Shares the Purchasers would receive upon exercise of any Warrants held by the
Purchasers at the time of the Special Migration Closing pursuant to Section
6.7(c).

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      1.4 VALUATION. For relevant Tax and financial reporting purposes, the
amount paid by the Purchasers for any Preferred Shares and any Warrants issued
on the same date shall be allocated between such Preferred Shares and such
Warrants based on their respective fair market values. Such allocation shall
initially be determined by the Purchasers and communicated to the US Company
within 30 days of the date such Preferred Shares and Warrants are issued, and
the US Company shall have the right to review and comment on the allocation
proposed by the Purchasers. The Purchasers and the US Company shall negotiate in
good faith to agree upon final allocation within 30 days after the date that the
Purchasers provide the US Company with their proposed allocation, and if the
Purchasers and the US Company cannot so agree, then the valuation shall be
referred to a nationally-recognized valuation expert wholly agreeable to the
parties for final determination; PROVIDED, however, that the valuation expert
shall be required to use the allocation proposed by the Purchasers unless there
is no reasonable basis for using such proposed allocation for such Tax purposes
or under generally accepted accounting principles used in the United States. The
fees and expenses of such expert in respect of any allocation shall be borne by
the Companies, unless such expert determines that there is no reasonable basis
for the allocation proposed by the Purchasers, in which case such fees and
expenses shall be borne by the Purchasers. For relevant Tax and financial
reporting purposes, the parties shall use the final allocation as so determined.
Notwithstanding anything in this Section 1.4 to the contrary, with respect to
any Preferred Shares and any Warrants issued following any Exchange Event, all
references in this Section 1.4 to the US Company will be deemed to refer to the
Canadian Company.

                                   ARTICLE II
                             CLOSING DATE; DELIVERY

      2.1 CLOSING DATE. The purchase and sale of the Initial Securities
hereunder (the "CLOSING," and such date, the "CLOSING DATE") shall be held at
the offices of Shearman & Sterling, 599 Lexington Avenue, New York, NY 10022 at
10:00 A.M. local time on May 6, 2003, or on such other business day as may be
mutually agreed upon by the US Company and the Purchasers.

      2.2 SUBSEQUENT CLOSING DATES. Each purchase and sale of Securities
hereunder after the Closing (each, a "SUBSEQUENT CLOSING," and each such date, a
"SUBSEQUENT CLOSING DATE") shall be held at the offices of Shearman & Sterling,
599 Lexington Avenue, New York, NY, 10022, at 10:00 A.M. local time, on such
business day as set forth in the relevant Subsequent Closing Notice or as may be
mutually agreed upon by the US Company and the Purchasers; PROVIDED, however,
that no Subsequent Closing shall occur after the third anniversary of the
Closing Date.

      2.3 DELIVERY. At the Closing, the US Company will deliver to each of the
Purchasers certificates (in definitive form) in such denominations and
registered in each

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Purchaser's name, as set forth in the Schedule of Purchasers, representing the
number of Preferred Shares and the number of Warrants, respectively, to be
purchased at the Closing by each of the Purchasers from the US Company against
payment of the purchase price therefor by wire transfer or such other method or
payment as the parties may agree. At each Subsequent Closing, the US Company (or
the Canadian Company following any Exchange Event) will deliver to each of the
Purchasers a certificate or certificates (in definitive form) in such
denominations and registered in each Purchaser's name, as set forth in the
Schedule of Purchasers, representing the number of Preferred Shares and the
number of Warrants, respectively, to be purchased at each such Subsequent
Closing by each of the Purchasers from the US Company (or the Canadian Company
following any Exchange Event) against payment of the purchase price therefor by
wire transfer or such other method of payment as the parties may agree.

                                  ARTICLE III
                      REPRESENTATIONS AND WARRANTIES OF THE
                       US COMPANY AND THE CANADIAN COMPANY

      Except to the extent set forth in the Companies' schedule of exceptions
delivered to the Purchasers on the date hereof (such schedule, which may be
updated from time to time as provided in Section 6.1(b), the "SCHEDULE OF
EXCEPTIONS"), which Schedule of Exceptions contains, with respect to each matter
disclosed therein, a specific reference to the representation and warranty for
which such matter is disclosed (PROVIDED, that items that are disclosed in any
section of the Schedule of Exceptions in such a way as to make their relevance
to the information called for by another section of the Schedule of Exceptions
readily apparent shall be deemed disclosed in respect of such other section of
the Schedule of Exceptions), each of the US Company and the Canadian Company,
jointly and severally, hereby represents and warrants to the Purchasers as
follows:

      3.1 ORGANIZATION AND STANDING. The US Company is a corporation duly
incorporated and validly existing under the laws of the State of Delaware. The
Canadian Company is a corporation duly amalgamated and validly existing under
the laws of the Province of Ontario, Canada. Except as set forth in the Schedule
of Exceptions, each of the US Company and the Canadian Company is duly qualified
to do business as a foreign corporation and is in good standing in each
jurisdiction in which the failure to so qualify could individually or in the
aggregate reasonably be expected to have a material adverse effect on the
condition, financial or otherwise, operations, assets or business of the US
Company, the Canadian Company and their respective Subsidiaries (as defined in
Section 3.3), or materially adversely affect the ability of the US Company or
the Canadian Company to consummate the transactions contemplated hereby or in
the other Transaction Documents (as defined in Section 3.2) (a "MATERIAL ADVERSE
EFFECT"). Each of the US Company and the Canadian Company has furnished the
Purchasers or their advisors with complete and correct copies of its Articles of
Amalgamation, Certificate of

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Incorporation, Articles of Amendment and By-Laws, as applicable, and, in each
case, all amendments thereto prior to or as of the date of this Agreement.

      3.2 CORPORATE POWER. Each of the US Company and the Canadian Company has
all requisite corporate power and authority to own the properties owned by it
and to carry on its business as now conducted and as presently contemplated by
each such Company to be conducted upon consummation of the transactions
contemplated by the Omni Agreements and to enter into this Agreement, the
Certificate of Designations, the Warrants and the registration rights agreement,
as applicable, to be dated the Closing Date, among the Canadian Company, the US
Company and the Purchasers (the "REGISTRATION RIGHTS AGREEMENT," and together
with this Agreement, the Certificate of Designations and the Warrants (together
with the Warrant Agreements related thereto), and any document evidencing any
security issuable under Section 6.7, the "TRANSACTION DOCUMENTS"). The US
Company has all requisite corporate power and authority to issue and sell the
Securities and to issue the Conversion Shares. The Canadian Company has all
requisite corporate power and authority to issue the securities contemplated to
be issued and sold in connection with any Exchange Event. Each of the US Company
and the Canadian Company has all requisite corporate power and authority to
carry out and perform its respective obligations under the terms of the
Transaction Documents applicable to it.

      3.3 SUBSIDIARIES. Except as set forth in the Schedule of Exceptions,
neither the US Company nor the Canadian Company has any Subsidiaries or owns,
directly or indirectly, of record or beneficially, any capital stock or equity
interest or investment in any Person (as defined below), and the Schedule of
Exceptions sets forth the Canadian Company's or the US Company's, as applicable,
percentage ownership interest in each such entity. Each Subsidiary is a
corporation duly organized, validly existing and in good standing under the laws
of its jurisdiction of incorporation and is in good standing in each
jurisdiction in which the failure to so qualify could reasonably be expected to
have a Material Adverse Effect. Each Subsidiary has all requisite corporate
power and authority to own the properties owned by it and to carry on its
business as now conducted and as presently proposed to be conducted. Except as
set forth in the Schedule of Exceptions and except for the Purchasers' interest
in the US Company, all of the issued and outstanding equity securities of each
Subsidiary is owned beneficially and of record by the US Company, the Canadian
Company, one of their respective other Subsidiaries or any combination of the US
Company, the Canadian Company and/or one or more of their respective other
Subsidiaries, in each case free and clear of any mortgages, pledges, liens,
charges, restrictions, claims or encumbrances of any nature whatsoever
(collectively, "LIENS"); and there are no outstanding subscriptions, warrants,
options, convertible securities or other equity securities or interests or other
rights (contingent or otherwise) pursuant to which any such Subsidiary is or may
become obligated to issue any shares of its capital stock or other equity
securities or interests to any Person other than the US Company, the Canadian
Company or one of their respective other Subsidiaries. As used

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in this Section 3 (unless the context otherwise requires), the term "US COMPANY"
shall mean the US Company, each predecessor thereto and each of its Subsidiaries
and the term "CANADIAN COMPANY" shall mean the Canadian Company, each
predecessor thereto and each of its Subsidiaries. As used in this Agreement, the
term "SUBSIDIARY" shall mean (i) a corporation of which 50% or more of the
combined voting power of the outstanding voting capital stock is owned, directly
or indirectly, by the Companies, by one or more Subsidiaries, or by one or both
of the Companies and one or more Subsidiaries, (ii) a partnership of which the
Companies, one or more Subsidiaries, or the Companies and one or more
Subsidiaries, directly or indirectly, is the general partner and/or has the
power to direct the policies, management and affairs of such partnership or
(iii) any other Person in which the Companies, one or more Subsidiaries, or the
Companies and one or more Subsidiaries, directly or indirectly, has at least a
50% interest and/or power to direct the policies, management and affairs
thereof; PROVIDED, however, that for the purposes of this Agreement, the US
Company shall not be considered a Subsidiary of the Canadian Company. As used in
this Agreement, the term "PERSON" shall mean any individual, partnership,
limited partnership, limited liability company, unlimited liability company,
corporation, trust, unincorporated organization, government, governmental agency
or governmental subdivision or any similar entity.

      3.4 CAPITALIZATION.

      (a) The authorized share capital of the Canadian Company consists of an
unlimited number of (i) Canadian Common Shares and (ii) preferred shares, of
which an unlimited number have been authorized and designated as Series 1
Preferred Shares. On the date hereof (x) 37,244,995 Canadian Common Shares are
issued and outstanding, all of which are validly issued and fully paid,
nonassessable and free of preemptive rights, (y) 10,075,000 Series 1 Preferred
Shares are issued and outstanding, and (z) 3,783,066 Canadian Common Shares are
available for issuance pursuant to the exercise of outstanding options and
warrants to purchase Canadian Common Shares. As of the Closing Date, after
giving effect to the transactions contemplated in this Agreement occurring on
such date, (A) 10,075,000 Series 1 Preferred Shares shall be outstanding; (B)
the number of outstanding Canadian Common Shares shall equal the number of such
shares outstanding on the date hereof, plus any such Canadian Common Shares
issued pursuant to any arrangement disclosed on the Schedule of Exceptions; and
(C) 10,075,000 Canadian Common Shares shall be issuable to holders of the Series
1 Preferred Shares upon the automatic conversion thereof. The Series 1 Preferred
Shares shall automatically convert by their terms into an equal number of
Canadian Common Shares upon the Canadian Company obtaining the Shareholder
Approval. On the date hereof and as of the Closing Date, the Series 1 Warrants
are and shall be exercisable for 2,015,000Canadian Common Shares.

      (b) The authorized capital stock of the US Company consists of (i)
500,000,000 Common Shares and (ii) 5,000,000 shares of preferred stock, of which

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100,000 have been authorized and designated as Preferred Shares. On the date
hereof and as of the Closing Date one (1) Common Share is and shall be, issued
and outstanding and owned beneficially and of record by the Canadian Company,
and such share is and shall be validly issued and fully paid, nonassessable and
free of preemptive rights. As of the date hereof, no Preferred Shares are issued
and outstanding and the only Preferred Shares that shall be issued and
outstanding as of the Closing Date shall be those that will be issued to the
Purchasers hereunder on such date.

      (c) Except as set forth in the Schedule of Exceptions, as of the date
hereof and as of the Closing Date, there are and shall be no outstanding
options, warrants, subscriptions, calls, convertible securities, phantom equity,
equity appreciation or similar rights, or other rights, agreements, arrangements
or commitments (contingent or otherwise) (including, without limitation, any
right of conversion or exchange under any outstanding security, instrument or
other agreement or any preemptive right) obligating either the US Company or the
Canadian Company or any of their respective Subsidiaries to issue, deliver or
sell, or cause to be issued, delivered or sold, any shares of capital stock or
any securities, instruments or rights which permit the holder thereof, under any
circumstances, to vote for the election of members of the applicable Company's
or any of the applicable Subsidiaries' boards of directors, or any securities,
instruments or rights which are, directly or indirectly, convertible into or
exercisable or exchangeable for any of the shares, securities, instruments or
rights described above in this sentence. The Schedule of Exceptions sets forth
the exercise, conversion or exchange price, as applicable, for each of the
securities disclosed thereon pursuant to the immediately preceding sentence. All
outstanding shares of capital stock of the US Company and the Canadian Company
have been offered, issued, sold and delivered by the US Company and the Canadian
Company, as applicable, in material compliance with all applicable federal,
state and provincial securities laws. Except as set forth in the Schedule of
Exceptions, as of the date hereof and as of the Closing Date, there are and
shall be no outstanding contractual obligations of the US Company or the
Canadian Company or any of their respective Subsidiaries to repurchase, redeem
or otherwise acquire any shares or make any investment (in the form of a loan,
capital contribution or otherwise) in any other Person other than a Subsidiary
of the US Company or the Canadian Company, as applicable. Except as set forth in
the Schedule of Exceptions and as will be provided for in the Registration
Rights Agreement, neither the US Company nor the Canadian Company is under any
obligation to register under the Securities Act (as defined in Section 3.6) any
of its currently outstanding securities or any of its securities which may
hereafter be issued.

      3.5 AUTHORIZATION; CONSENTS, ETC.

      (a) Except as set forth on the Schedule of Exceptions, all corporate
action on the part of each of the US Company, the Canadian Company and their
respective directors and shareholders necessary for the due authorization,
execution, delivery and

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performance by such Company of this Agreement and the other Transaction
Documents, as applicable, and all other agreements contemplated hereby and
thereby and the consummation of the transactions contemplated herein and
therein, including without limitation the Migration and the Exchange Event, and
for the due authorization, issuance and delivery of the Securities and of the
Conversion Shares, as applicable (including, without limitation, any issuance of
Securities under Section 6.7), has been taken. The US Company has taken such
action as necessary to approve for purposes of Section 203 of the Delaware
General Corporation Law the transactions contemplated by this Agreement. The
rights, preferences, privileges and restrictions of (i) the Preferred Shares are
as set forth in the Certificate of Designations and (ii) the Warrants are as set
forth therein. The rights, preferences, privileges and restrictions of the
Series 1 Preferred Shares and the Series 1 Warrants are as set forth in the
board resolutions attached as Annex B to the Series 1 Subscription Agreement and
in the Series 1 Warrant, respectively. Each Transaction Document to which either
the US Company or the Canadian Company is subject is a legal, valid and binding
obligation of such Company, enforceable in accordance with its respective terms,
subject to applicable bankruptcy, insolvency, reorganization and moratorium laws
and other laws of general application affecting enforcement of creditors' rights
generally.

      (b) Neither (i) the execution, delivery and performance by each of the US
Company and the Canadian Company of each Transaction Document to which it is
subject, and compliance therewith (including, without limitation, in the event
of any Exchange Event, the issuance and sale of the Securities and the issuance
of the Conversion Shares, as applicable), nor (ii) the Migration, will result in
any violation of or be in conflict with, or result in a breach of, or constitute
a default under, or be an event which, with or without the giving of notice or
passage of time or both, will become a default under, or give to others any
right of termination, cancellation, modification, payment or acceleration of, or
accelerate the performance required by or maturity of, or result in the creation
of any lien or loss of any rights with respect to the assets of either Company
or any of their respective Subsidiaries pursuant to (x) any term or provision of
any applicable law, ordinance, rule or regulation to which the applicable
Company or any of its Subsidiaries is subject and which violation, breach or
default could reasonably be expected to have a Material Adverse Effect, (y) the
organizational documents of either Company or either Company's Subsidiaries or
(z) any term or provision of any Contract (as defined in Section 3.12) and, in
the case of this clause (z), which violation, breach or default could reasonably
be expected to have a Material Adverse Effect. No shareholder or other Person
has any preemptive right or right of first refusal which will be triggered by
reason of the issuance of the Securities. The Securities, when issued in
compliance with the provisions of this Agreement, will be validly issued, fully
paid and nonassessable and will be free and clear of any Liens. The Conversion
Shares have been duly authorized and validly reserved, are not subject to any
preemptive rights or rights of first refusal and, upon issuance in accordance
with the terms of this Agreement and the Warrants, will be validly issued, fully
paid and nonassessable.

                                       x

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      3.6 REPORTS; FINANCIAL STATEMENTS. Each of the US Company and the Canadian
Company, as applicable, has timely filed all forms, reports, statements and
schedules required to be filed with the Securities and Exchange Commission (the
"SEC") since January 1, 2001. Each of the US Company and the Canadian Company
has made available to the Purchasers true and complete copies of all reports,
registration statements and other filings, together with any amendments thereto,
filed by either such Company with the SEC since January 1, 2001 (the "COMPANY
SEC REPORTS"). As of the respective dates of their filing with the SEC or as of
the respective dates of any amendments thereto, the Company SEC Reports complied
in all material respects with the applicable requirements of the Securities Act
of 1933, as amended (the "SECURITIES ACT"), or the Securities Exchange Act of
1934, as amended (the "EXCHANGE ACT"), and the rules and regulations promulgated
thereunder, and did not contain any untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary in order to
make the statements therein, in the light of the circumstances under which they
were made, not misleading. Each of the consolidated financial statements
(including, without limitation, any related notes and schedules) contained (or
incorporated by reference) in the Company SEC Reports (the "FINANCIAL
STATEMENTS") (i) has been prepared in accordance with the published rules and
regulations of the SEC and US generally accepted accounting principles ("GAAP")
applied on a consistent basis with past practice (except as may be indicated in
the notes thereto) and (ii) fairly presents in all material respects the
consolidated financial position of the applicable Company and its Subsidiaries
as of the respective dates thereof and their consolidated results of operations,
stockholder equity and cash flows for the periods indicated, except that any
unaudited interim financial statements were subject to normal and recurring
year-end adjustments and may omit footnote disclosure as permitted by
regulations of the SEC.

      3.7 OUTSTANDING DEBT. None of the US Company, the Canadian Company or any
of their respective Subsidiaries has any outstanding indebtedness for borrowed
money or is a guarantor or otherwise contingently liable for any such
indebtedness, in each case except as reflected on any balance sheet that is part
of the financial statements delivered to the Purchasers prior to the date hereof
(the "2002 FINANCIAL STATEMENTS"), the Financial Statements or as listed on the
Schedule of Exceptions.

      3.8 ABSENCE OF LIABILITIES. None of the US Company, the Canadian Company
or any of their respective Subsidiaries have any liabilities of any kind
whatsoever, whether accrued, contingent, absolute, determined, determinable or
otherwise, other than (i) liabilities to the extent disclosed or provided for in
the Financial Statements, the 2002 Financial Statements or set forth in the
notes thereto or disclosed in the Company SEC Reports, or (ii) liabilities that
would not, individually or in the aggregate, reasonably be expected to have a
Material Adverse Effect. Except as set forth in the Schedule of Exceptions, the
Migration shall not give rise to or otherwise result in the US Company, the
Canadian Company or any of their respective Subsidiaries incurring any material
liabilities or obligations (whether absolute, accrued, contingent or otherwise)
which were

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not liabilities of the US Company, the Canadian Company or any of their
respective Subsidiaries immediately prior to the Migration.

      3.9 ABSENCE OF CERTAIN CHANGES. Since December 31, 2002, except to the
extent described in the Schedule of Exceptions or the Company SEC Reports, there
has not been any event or condition of any character which, individually or in
the aggregate, could reasonably be expected to have a Material Adverse Effect,
including, but not limited to: (x) any damage, destruction or loss of any of the
properties or assets of the US Company or the Canadian Company or any of their
respective Subsidiaries (whether or not covered by insurance) materially
adversely affecting the business or plans of the US Company or the Canadian
Company or any of their respective Subsidiaries; or (y) any declaration, setting
aside for payment or other distribution in respect of any of the capital stock
of the US Company or the Canadian Company, or any direct or indirect redemption,
purchase or other acquisition of any of such stock by the US Company or the
Canadian Company.

      3.10 TAXES. Each of the US Company, the Canadian Company and their
respective Subsidiaries has timely filed all material Tax returns required to be
filed by or with respect to such Person. Except as set forth in the Schedule of
Exceptions, all such Tax returns are true and correct in all material respects.
All Taxes shown to be due on such Tax returns have been paid. For U.S. federal
income Tax purposes, the Canadian Company does not reasonably believe that (i)
it is a "passive foreign investment company," or "foreign personal holding
company" or (ii) as of the date hereof, it is a "controlled foreign
corporation." The Purchasers have been granted access by each of the US Company
and the Canadian Company to complete copies of their (and each of its respective
Subsidiaries') Tax returns with respect to the past three (3) Taxable years and
copies of all material written correspondence with any Taxing authority. Except
as set forth in the Schedule of Exceptions, none of the US Company, the Canadian
Company or any of their respective Subsidiaries has received any written notice
from any Taxing authority of any pending examination or any proposed deficiency,
addition, assessment, demand for payment or adjustment relating to or affecting
Taxes of such Company or any of its Subsidiaries, and none of the US Company,
the Canadian Company or any of their respective Subsidiaries has any reason to
believe that any Taxing authority may assess (or threaten to assess) any
material Taxes for any past periods. Except as set forth in the Schedule of
Exceptions or contained in a Material Contract (as defined in Section 3.12),
none of the US Company, the Canadian Company or any of their respective
Subsidiaries is liable for a material amount of Tax under any Tax indemnity
agreement (or other similar agreement) or has any liability for a material
amount of Tax of any other Person (other than such Company and its
subsidiaries). Except as set forth in the Schedule of Exceptions, there are no
pending claims for a material amount of Tax under any Tax indemnity agreement
(or other similar agreement) to which the US Company or the Canadian Company or
any of their respective Subsidiaries is a party, and neither the US Company nor
the Canadian Company has any reason to believe that a claim for a material

                                      xii

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amount of Tax will be made under any such agreements. "TAX" means any and all
Canadian (or U.S.) federal, state, provincial or other local taxes, any other
non-Canadian, non-U.S. taxes and any interest, penalties, or additions to tax
related thereto. Except as set forth in the Schedule of Exceptions, each of the
Canadian Company and its Subsidiaries has withheld and collected all material
amounts required by applicable Tax law to be withheld or collected by it on
account of Taxes and has remitted all such amounts to the appropriate Taxing
authority within the time prescribed under the applicable law. Except as set
forth in the Schedule of Exceptions, for all material transactions between the
Canadian Company or any one of its Subsidiaries, on the one hand, and any Person
who is a non-resident of Canada (as such term is defined in the Income Tax Act
(Canada)) and with whom the Canadian Company or such Subsidiary was not dealing
at arm's length for purposes of the Income Tax Act (Canada), on the other hand,
the Canadian Company or such Subsidiary, as the case may be, has made or
obtained records or documents that satisfy the requirements of paragraphs
247(4)(a) to (c) of the Income Tax Act (Canada).

      3.11 EMPLOYEE BENEFITS; ERISA.

      (a) With respect to each employee benefit plan (as such term is defined in
Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended
("ERISA")) (an "EMPLOYEE BENEFIT PLAN") maintained by the US Company or an
"ERISA AFFILIATE" (as defined below), except as could not reasonably be expected
to have a Material Adverse Effect: (i) such plan has been administered and
operated in compliance with its terms and the applicable requirements of ERISA
and the Internal Revenue Code of 1986, as amended (the "CODE"); (ii) no event
has occurred and there exists no circumstance under which the US Company could
incur liability under ERISA, the Code, or otherwise (other than for
contributions or benefits paid or payable in the ordinary course of operation of
such plan); (iii) there are no actions, suits or claims pending or threatened
with respect to any Employee Benefit Plan or against the assets or a fiduciary
of any Employee Benefit Plan; (iv) no "prohibited transaction" (as defined in
Section 406 of ERISA or Section 4975 of the Code) which is not covered by an
applicable exemption has occurred; (v) no "reportable event" (as defined in
Section 4043 of ERISA) has occurred; (vi) all contributions and premiums due
have been paid on a timely basis; and (vii) all contributions made under any
Employee Benefit Plan intended to be tax deductible meet the requirements for
deductibility under the Code. As used herein, the term "ERISA Affiliate" refers
to any organization other than the Canadian Company that is (x) a member of a
"controlled group" of which the US Company is a member or (y) under "common
control" with the US Company within the meaning of Sections 414(b) and (c) of
the Code. Each Employee Benefit Plan maintained by the US Company or any ERISA
Affiliate is listed on the Schedule of Exceptions or in the Company SEC Reports.
Each Employee Benefit Plan maintained by the US Company or any ERISA Affiliate
that is intended to qualify under Section 401(a) of the Code has received a
favorable letter of determination from the U.S. Internal Revenue Service that it

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so qualifies and that its related trust is exempt from taxation under Section
501(a) of the Code except as could not reasonably be expected to have a Material
Adverse Effect. No event has occurred that will or could give rise to
disqualification or loss of tax-exempt status of any such Employee Benefit Plan
or trust under Section 401(a) or 501(a) of the Code. No US Company or ERISA
Affiliate benefit plan is a "defined benefit plan" within the meaning of Section
3(35) of ERISA, a "multiemployer plan" within the meaning of Section 3(37) of
ERISA, or a "multiple employer plan" within the meaning of Section 413 of the
Code. Except as set forth in the Schedule of Exceptions, neither the approval or
execution of this Agreement or any other Transaction Document nor the
consummation of the transactions contemplated by this Agreement or any such
other Transaction Document will (A) entitle any individual to severance pay or
(B) accelerate the time of payment or vesting of, or increase the amount of,
compensation due to any individual.

      (b) Except as set forth in the Schedule of Exceptions or the Company SEC
Reports, there are no written employee benefit, welfare, supplemental,
unemployment benefit, bonus, pension, profit sharing, deferred compensation,
stock compensation, stock purchase, stock option, stock appreciation, savings,
severance, termination, change of control, retirement, hospitalization
insurance, salary continuation, legal, health or other medical, dental, life,
disability or other insurance and other similar plans currently sponsored,
maintained or funded by the Canadian Company for the benefit of its current or
former employees and their dependants, other than plans established pursuant to
statute (such plans set out in the Schedule of Exceptions and the Company SEC
Reports other than the Registered Retirement Savings Plan administered by CUPE
Local 1338-01 (the "Group RRSP"),collectively the "CANADIAN EMPLOYEE PLANS").
Except as could not reasonably be expected to have a Material Adverse Effect:
(i) each Canadian Employee Plan has been established, registered (where
required) and administered in accordance with its terms and all applicable laws;
(ii) there are no actions, complaints, suits or claims (other than routine
claims for benefits) pending or, to the knowledge of the Canadian Company,
threatened with respect to any Canadian Employee Plan; (iii) all contributions
and premiums payable in accordance with the terms of the Canadian Employee Plans
have been paid on a timely basis in accordance with applicable law and the terms
of the Canadian Employee Plans; and (iv) to the knowledge of the Canadian
Company, no fact or circumstance exists that could adversely affect the
tax-preferred status of any Canadian Employee Plan which is registered where
required; (v) to the knowledge of the Canadian Company there is no audit or
investigation pending (other than routine qualification or registration
determination filings) with respect to any Canadian Employee Plan by any
governmental entity; (vi) except as required by applicable law, no promises or
commitments have been made to amend any Canadian Employee Plan, to provide
increased benefits thereunder other than benefit increases required under the
Canadian Employee Plans or by applicable collective bargaining agreements or to
establish any new Canadian Employee Plan and (vii) no employee of the Canadian
Company has any agreement as to length of notice or pay in lieu of notice or
severance payment required to

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terminate his/her employment, other than such as results by applicable law from
the employment of an employee without an agreement as to notice of termination
pay in lieu of notice or severance. No Canadian Employee Plan is a registered
pension plan which provides defined benefit pension benefits. The Canadian
Company has made the required contributions to the Group RRSP on a timely basis
and in accordance with applicable law, the applicable collective bargaining
agreements and the applicable terms of the Group RRSP.

      3.12 CONTRACTS. Except as set forth in the Schedule of Exceptions or the
exhibit list of the Company SEC Reports, none of the US Company, the Canadian
Company or any of their respective Subsidiaries has any currently existing
contract, obligation, license, agreement, plan, arrangement, commitment or the
like (written or oral) ("CONTRACT") of any material nature, including, without
limitation, the following: (i) material employment or consulting Contracts
(other than oral agreements for indefinite hire terminable upon statutory notice
or pay in lieu thereof) or any collective bargaining agreement; (ii) loan or
other Contracts, notes, indentures, or instruments relating to or evidencing
indebtedness for borrowed money, or mortgaging, pledging or granting or creating
a Lien on any of such Company's property or any agreement or instrument
evidencing any guaranty by such Company of payment or performance by any other
Person or entity in excess of $1 million; (iii) Contracts providing for the
acquisition of any material assets, disposition of the business, assets or
shares of such Company, Contracts of merger, amalgamation, arrangement or
consolidation to which such Company is a party or letters of intent with respect
to the foregoing, in each case to the extent the transaction contemplated
thereby involves aggregate consideration of more than $10 million; (iv) any
joint venture Contract or other Contract involving a sharing of profits or
expenses; (v) Contracts limiting the freedom of such Company to compete in any
line of business or in any geographic area or with any Person or entity; and
(vi) any Contract or series of Contracts with the same Person or related Persons
for the furnishing of goods or services, to the extent such Contract is (A) with
any of the top 10 (ten) municipal customers of the Companies (as measured by
aggregate revenue to the Companies in the immediately preceding 12 month
period), (B) is with any of the top 5 (five) landfill customers of the Companies
(as measured by aggregate payments by the Companies in the immediately preceding
12 month period) or (C) involves outstanding aggregate payments to or by either
Company or any of their respective Subsidiaries in excess of $1 million per
annum (any such Contract, together with any material performance or surety bond,
letter of credit or other Contract providing financial assurance or performance
(none of which, for the avoidance or doubt, are listed on the Schedule of
Exceptions) a "MATERIAL CONTRACT"). Each of the US Company and the Canadian
Company has complied with all the material provisions of each Material Contract
to which it is subject and is not in default thereunder or in breach of or in
receipt of any claim of default or breach thereof. Neither the US Company nor
the Canadian Company has any knowledge of any breach by the other parties to any
Material Contract. To the knowledge of the US Company and the Canadian Company,
the representations

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and warranties set forth in Section 2 of each of the Omni Agreements are true
and correct.

      3.13 INSURANCE. Each of the US Company, the Canadian Company and their
respective Subsidiaries maintain all insurance required by any Contract. All
material assets, properties and risks of each Company and its respective
Subsidiaries are covered by valid and currently effective insurance policies or
binders of insurance (including, without limitation, general liability
insurance, property insurance and workers' compensation insurance) issued in
favor of the applicable Company or Subsidiary, as the case may be, in such types
and amounts and covering such risks as are consistent with practices and
standards of companies engaged in businesses and operations similar to those of
the Companies and their respective Subsidiaries.

      3.14 AFFILIATE ARRANGEMENTS. Except as set forth in the Schedule of
Exceptions or the Company SEC Reports and other than employment agreements and
Employee Benefit Plans, no officer, director or Affiliate of either Company or
any of their respective spouses or children (or any entity controlled by any
such Person) has (i) any indebtedness of, or owing to, the Canadian Company or
the US Company or any of their respective Subsidiaries or (ii) any contractual
arrangements, whether written or oral, with the Canadian Company or the US
Company or any of their respective Subsidiaries. Except as disclosed in the
Company SEC Reports or the Schedule of Exceptions, none of the officers or
directors or Affiliates of either Company, or their respective spouses or
children (or any entity controlled by any such Person), owns directly or
indirectly, individually or collectively, a material interest in any entity
which is a competitor, client or supplier of (or has any existing contractual
relationship with) the US Company or the Canadian Company or any of their
respective Subsidiaries, provided that the foregoing disclosure requirement
shall not apply to ownership of not more than 5% of the outstanding stock of a
publicly-held company. "AFFILIATE" means a Person that directly, or indirectly
through one or more intermediaries, controls, or is controlled by, or is under
common control with, the Person specified.

      3.15 LITIGATION. Except as set forth in the Schedule of Exceptions or the
Company SEC Reports, there is no pending or, to the knowledge of the US Company
or the Canadian Company, as applicable, threatened, action, suit, proceeding or
claim, whether or not purportedly on behalf of such Company, to which such
Company is or may be named as a party or its business or assets are or may be
subject and in which an unfavorable outcome, ruling or finding individually or
in the aggregate could reasonably be expected to have a Material Adverse Effect.
There is no pending or, to the knowledge of the US Company or the Canadian
Company, as applicable, threatened claim or litigation, against or affecting
such Company contesting its right to conduct its business in the manner and the
locations in which such Company currently does business.

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      3.16 CONSENTS. Except as set forth in the Schedule of Exceptions, no
consent, approval, qualification, order or authorization of, or filing with, any
governmental authority is required in connection with either the US Company's or
the Canadian Company's valid execution, delivery or performance of the
applicable Transaction Documents, or the offer, issue or sale of the Securities
by the US Company (or the Canadian Company following any Exchange Event), the
exercise of the Warrants, the issuance of the Conversion Shares, the Exchange
Event or the consummation of any other transaction contemplated on the part of
the US Company or the Canadian Company hereby or thereby.

      3.17 PROPERTIES; LIENS AND ENCUMBRANCES. Except as set forth in the
Schedule of Exceptions or the Company SEC Reports, there is no material real
property owned by the US Company or the Canadian Company or any of their
respective Subsidiaries (the "REAL PROPERTY"). The US Company, the Canadian
Company or their respective Subsidiaries have good, valid and marketable title
to all the Real Property and all of their other material property and assets,
free and clear of all mortgages, pledges, liens, security interests, conditional
sale agreements, encumbrances or charges (collectively, "LIENS"), other than
Liens (i) for current Taxes, materialmen's or like liens for obligations not yet
due or payable or being contested; in good faith by appropriate proceedings and
for which an adequate reserve (if required by GAAP) has been made on the
Financial Statements; (ii) arising under the Credit Agreement; and (iii) as
could not reasonably be expected to materially interfere with the current use of
such property or materially detract from the value thereof (collectively,
"PERMITTED ENCUMBRANCES"). The assets, properties, contracts and rights of the
US Company and the Canadian Company together with their respective Subsidiaries,
include all of the assets, properties, contracts and rights that are necessary
or material to the conduct of their respective businesses in the manner as they
are currently conducted or that are reflected in the consolidated balance sheet
of the Canadian Company included in the Financial Statements (other than assets
reflected on such balance sheet that have been sold or disposed of in the
ordinary course of business consistent with past practice since the date
thereof). Except as set forth in the Schedule of Exceptions, Omni has all
requisite permits, authorizations and approvals from governmental authorities to
operate the Omni Landfill. Omni has entered into all material agreements
necessary or advisable to complete construction of the Omni Landfill.

      3.18 LEASES. Except as set forth in the Schedule of Exceptions or the
Company SEC Reports, there is no material real or personal property leased by
the US Company, the Canadian Company, or any of their respective Subsidiaries.
Except as set forth in the Schedule of Exceptions, the US Company, the Canadian
Company, or one of their respective Subsidiaries enjoys peaceful and undisturbed
possession under all such leases, all of such leases are valid and subsisting
and none of the US Company, the Canadian Company or any of their respective
Subsidiaries or, to the knowledge of the US Company or the Canadian Company, the
lessor thereunder is in default thereof.

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<Page>

      3.19 ENVIRONMENTAL MATTERS. Except as disclosed in the Schedule of
Exceptions or the Company SEC Reports:

      (a) Each of the US Company, the Canadian Company and their respective
Subsidiaries is, and for the past five (5) years has been, in material
compliance with all applicable Environmental Laws (as defined below) pertaining
to any of the properties and assets of the US Company, the Canadian Company or
any of their respective Subsidiaries (including, without limitation, the Real
Property and the properties currently or formerly owned, leased or used) and to
the use and ownership thereof, and to their businesses and operations.

      (b) Each of the US Company, the Canadian Company and their respective
Subsidiaries is in possession of, and in material compliance with, all material
permits, licenses, authorizations, approvals and consents required pursuant to
any applicable Environmental Law ("ENVIRONMENTAL PERMITS"), including, without
limitation, with respect to the operation of the Real Property. Each of the
Environmental Permits is in full force and effect, and no action is pending or,
to the knowledge of the US Company or the Canadian Company, threatened, to
revoke, suspend, modify or limit any Environmental Permits, where such
revocation, suspension, modification or limitation would reasonably be expected
to have a material impact.

      (c) None of the US Company, the Canadian Company or any of their
respective Subsidiaries has received written notice of any Environmental Claim
against the US Company, the Canadian Company or any of their respective
Subsidiaries or involving the Real Property where the environmental claim
remains unresolved and to the knowledge of the US Company, the Canadian Company
or any of their respective Subsidiaries, no such Environmental Claim is
threatened. There has not been a material Release of Materials of Environmental
Concern in quantities and concentrations that require reporting pursuant to
applicable Environmental Law or Remedial Action at any of the properties owned,
leased or operated by the US Company, the Canadian Company (including, without
limitation, the Real Property), their respective Subsidiaries or any predecessor
in interest, where such Release has not been remediated in accordance with the
requirements of applicable Environmental Law. None of the US Company, the
Canadian Company or any of their respective Subsidiaries is conducting any
Remedial Action (as defined below) relating to any Release or threatened Release
of Materials of Environmental Concern at any real property currently or formerly
owned, leased or used. To the knowledge of the US Company and the Canadian
Company, no material capital expenditure is required in the current or the
immediately following fiscal year, in respect of the business, the Real Property
or any of the US Company's or the Canadian Company's or their respective
Subsidiaries' assets pursuant to or to comply with any Environmental Law, where
such expenditure has not been included in an applicable budget. Each of the US
Company and the Canadian Company has provided to the

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Purchasers all material environmental site assessments prepared in the last
seven (7) years in its or its representative's possession, custody or control.

      (d) As used herein, the following terms have the following meanings.
"ENVIRONMENTAL CLAIMS" means any complaint, notice, directive, order, claim,
litigation, investigation, judicial or administrative proceeding, judgment,
letter or other communication from any governmental agency, office or other
authority, or any third party, involving violations of Environmental Laws or the
presence, threatened Release or Release of Materials of Environmental Concern
from any currently or formerly owned or operated assets or properties
(including, without limitation, the Real Property) of the US Company, the
Canadian Company or their respective Subsidiaries. "ENVIRONMENTAL LAW" means any
foreign, federal, state, provincial, territorial, or local law, statute,
regulation, rule, order, ordinance, decree, injunction, judgment, governmental
approval or any other requirement of law (including, without limitation, common
law) regulating or relating to the protection of human health or safety as such
relates to exposure to Materials of Environmental Concern, natural resources or
the environment, including, but not limited to, laws relating to pollution,
contamination or the use, generation, management, handling, collection,
transfer, transport, treatment, recycling, storage, incineration, Release or
threatened Release of Materials of Environmental Concern. "MATERIALS OF
ENVIRONMENTAL CONCERN" means any substance, material, product, waste, pollutant
or contaminant that: (i) is or contains asbestos, urea formaldehyde foam
insulation, polychlorinated biphenyls, petroleum, petroleum products or
petroleum-derived substances or wastes or radon gas, (ii) requires Remedial
Action under any Environmental Law, or is defined, listed or identified as
"hazardous waste," "hazardous" or "toxic," (iii) is regulated as toxic,
explosive, flammable, infectious, radioactive, carcinogenic or mutagenic or as a
pollutant or contaminant, under any Environmental Law. "RELEASE" means any
releasing, disposing, discharging, injecting, spilling, leaking, leaching,
pumping, dumping, emitting, escaping, emptying, seeping, dispersal or migration,
including, without limitation, the moving of any materials through, into or
upon, any land, soil, surface water, ground water or air, or otherwise entering
into the environment. "REMEDIAL ACTION" means all actions required under
applicable Environmental Laws to (x) clean up, remove, treat or in any other way
remediate any Materials of Environmental Concern, (y) prevent the Release of
Materials of Environmental Concern so that they do not migrate or endanger or
threaten to endanger public health or welfare or the environment; or (z) perform
studies, monitoring, testing and investigations related to any Materials of
Environmental Concern.

      (e) Other than with respect to the representations and warranties
contained in this Section 3.19 and to the extent applicable, Sections 3.8 and
3.9, no other representations and warranties included in this Agreement shall
apply to any environmental matter and no other representation or warranty,
express or implied, is being made with respect thereto.

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      3.20 OFFERING. Assuming the accuracy of the Purchasers' representations
and warranties in Section 4 hereof, the offer, issuance and sale of the
Securities as contemplated by this Agreement are exempt from the registration
requirements of the Securities Act, and from any registration, prospectus or
filing requirements of any applicable state, provincial, territorial or foreign
securities laws (except, following any Exchange Event, the filing of a Form
45-501 with the Ontario Securities Commission), provided that at the time of any
Exchange Event, the holders remain resident in the United States and are
"accredited investors" within the meaning of Ontario Securities Commission Rule
45-501; none of the US Company, the Canadian Company or anyone acting on their
behalf will take any action hereafter that would cause the loss of such
exemption.

      3.21 COMPLIANCE WITH OTHER INSTRUMENTS AND LAWS. None of the US Company,
the Canadian Company or any of their respective Subsidiaries is in violation of
(i) any term of its organizational documents or By-Laws, in each case, as in
effect on the date hereof, (ii) any term of any judgment, decree or order to
which such Company is subject or (iii) any statute, rule or regulation to which
it is subject, except for violations under the foregoing clause (ii) or this
clause (iii) which, individually or in the aggregate, could not reasonably be
expected to have a Material Adverse Effect. Without limiting the generality of
the foregoing, no filing under the HSR Act is required in connection with the
Omni Acquisition. Each of the US Company and the Canadian Company has all
franchises, permits, licenses and other rights and privileges from governmental
authorities necessary to permit it to own its property and to conduct its
business as it is presently conducted, except where the failure to have any such
franchises, permits, licenses or other rights or privileges would not have,
individually or in the aggregate, a Material Adverse Effect.

      3.22 EMPLOYEES. Except as set forth in the Schedule of Exceptions or the
Company SEC Reports, neither the Canadian Company nor the US Company nor any of
their Subsidiaries has any collective bargaining agreement covering any of its
employees and, except for any such collective agreement, no trade union, council
of trade unions, employee bargaining agency or affiliated bargaining agent holds
bargaining rights with respect to any of the employees of the Canadian Company,
the US Company or any of their respective Subsidiaries, or, to the knowledge of
the Canadian Company or the US Company, has applied or threatened to apply to be
certified as the bargaining agent of any such employees. No material grievances
or arbitration proceedings are pending under any such collective bargaining
agreement. To the knowledge of the Companies, no trade union has applied to have
the Canadian Company, the US Company or any of their Subsidiaries declared a
related employer pursuant to the LABOUR RELATIONS ACT (Ontario) or any similar
legislation in any jurisdiction in which the Canadian Company, the US Company or
any of their Subsidiaries carries on business. To the knowledge of the Canadian
Company or the US Company, no audit of the Canadian Company, the US Company or
any of their Subsidiaries is currently being performed pursuant to any

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applicable workplace safety and insurance/workers' compensation legislation,
including, without limitation, applicable Occupational Health and Safety
legislation. Except as set forth in the Schedule of Exceptions or the Company
SEC Reports, the Company is not bound to or bound by any Contract in respect of
any employees requiring payment of compensation upon termination of employment,
other than oral or written agreements for indefinite hire terminable upon common
law and/or statutory notice or pay in lieu thereof.

      3.23 BROKERS. Except for Lehman Brothers Inc., the fees of which have been
disclosed to the Purchaser, none of the US Company, the Canadian Company or any
of their respective Subsidiaries has any Contract with any broker, finder or
similar agent with respect to the transactions contemplated by this Agreement or
the other Transaction Documents.

      3.24 SHAREHOLDER APPROVAL. The vote of shareholders of the Canadian
Company (i) required for the Shareholder Approval is the affirmative vote of the
majority of votes cast at a meeting of holders of Canadian Common Shares and
(ii) required for the Migration is the percentage of securities specified by the
Ontario Court of Justice. The Canadian Company will request the Ontario Court of
Justice to specify a percentage of two-thirds of the votes cast by those persons
entitled to vote of the meeting.

      3.25 RIGHTS AGREEMENT. The Canadian Company and its Board of Directors,
has irrevocably taken all actions necessary to (i) render the Rights Agreement
of the Canadian Company, dated as of September 2, 1999, as amended (the "RIGHTS
AGREEMENT"), inapplicable to the transactions contemplated by this Agreement
(including, without limitation, any issuance of Securities under Section 6.7)
and the other Transaction Documents and (ii) ensure that (x) none of the
Purchasers or the Purchasers as a group are an Acquiring Person (as defined in
the Rights Agreement) pursuant to the Rights Agreement as a result of the
execution of this Agreement or the other Transaction Documents or the
consummation of the transactions contemplated hereby and thereby and (y) a
Distribution Date, a Triggering Event or a Share Acquisition Date (as such terms
are defined in the Rights Agreement) does not occur by reason of the approval,
execution or delivery of this Agreement or the other Transaction Documents, the
announcement thereof or the consummation of the transactions contemplated hereby
or thereby (including, without limitation, any issuance of Securities under
Section 6.7). The US Company has not and will not adopt a rights agreement
unless it contains exceptions relating to the US Company that are substantially
identical to those applicable to the Canadian Company that are contemplated by
this Section 3.25.

                                   ARTICLE IV
               REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS

      Each of the Purchasers, severally, not jointly, represents and warrants to
the US Company and the Canadian Company as follows:

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      4.1 ORGANIZATION AND AUTHORITY OF THE PURCHASERS. Each Purchaser is duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization and has all necessary power and authority to
enter into this Agreement and the other Transaction Documents to which it is a
party, to carry out its obligations hereunder and thereunder and to consummate
the transactions contemplated by this Agreement. The execution and delivery by
each Purchaser of the Transaction Documents to which it is a party, the
performance by each Purchaser of its obligations hereunder and thereunder and
the consummation by each Purchaser of the transactions contemplated by this
Agreement have been duly authorized by all requisite action on the part of each
Purchaser. This Agreement has been, and upon their execution and delivery the
other Transaction Documents to which it is a party shall be, duly executed and
delivered by each Purchaser and (assuming due authorization, execution and
delivery by the Companies) this Agreement and the other Transaction Documents to
which it is a party shall constitute legal, valid and binding obligations of
each Purchaser, enforceable against such Purchaser in accordance with its terms,
subject to applicable bankruptcy, insolvency, reorganization and moratorium laws
and other laws of general application affecting enforcement of creditors' rights
generally.

      4.2 EXPERIENCE. Such Purchaser is experienced in evaluating and investing
in emerging companies such as the Company. Such Purchaser is and will be at the
time of the Closing and any Subsequent Closing an "accredited investor" within
the meaning of Rule 501 of the Securities Act and within the meaning of the
Ontario Securities Commission Rule 45-501 and is able to fend for itself in the
transactions contemplated by this Agreement, has such knowledge and experience
in financial and business matters as to be capable of evaluating the merits and
risks of its investment, has no need for liquidity in its investment and has the
ability to bear the economic risks of its investment.

      4.3 INVESTMENT. Such Purchaser is acquiring the Securities to be purchased
by it for investment for its own account and not with the view to, or for resale
in connection with, any public distribution thereof; PROVIDED, however, that the
disposition of such Purchaser's property shall at all times be within its
control. Such Purchaser understands that the Securities and the Conversion
Shares have not been registered under the Securities Act or under any state
securities laws by reason of a specified exemption from the registration
provisions of the Securities Act and such state securities laws which depends
upon, among other things, the bona fide nature of such Purchaser's investment
intent as expressed herein. Such Purchaser acknowledges that the Securities to
be purchased by it must be held indefinitely unless they are subsequently
registered under the Securities Act or an exemption from such registration is
available. Such Purchaser further understands that any Securities issued by the
Canadian Company will be issued under an exemption from the prospectus filing
and registration requirements of the Securities Act (Ontario) and the resale or
other disposition of all or any of the Securities will be restricted under the
Securities Act (Ontario).

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<Page>

      4.4 CONSENTS. Except for any filings, notices, approvals, or consents that
may be required under the legislation referred to in Section 5.1.1, no consent,
approval, qualification, order or authorization of, or filing with, any
governmental authority is required to be obtained by the Purchasers in
connection with such Purchaser's valid execution, delivery or performance of
this Agreement or the other Transaction Documents or the consummation of any
other transaction contemplated by this Agreement or the other Transaction
Documents.

      4.5 NO CONFLICTS. The execution, delivery and performance by such
Purchaser of each Transaction Document to which it is a party and compliance
therewith will not result in any violation of or be in conflict with, or result
in a breach of, or constitute a default under, or be an event which, with or
without the giving of notice or passage of time or both, will become a default
under, or give to others any right of termination, cancellation, modification,
payment or acceleration of, or accelerate the performance required by or
maturity of, or result in the creation of any lien or loss of any rights with
respect to the assets of such Purchaser pursuant to (i) any term or provision of
any applicable law, ordinance, rule or regulation to which such Purchaser is
subject and which violation, breach or default could reasonably be expected to
adversely affect the ability of such Purchaser to carry out its obligations
under, and to consummate the transactions contemplated by, this Agreement (a
"PURCHASER ADVERSE EFFECT"), (ii) the organizational documents of such Purchaser
or (iii) any term or provision of any Contract and which violation, breach or
default could reasonably be expected to have a Purchaser Adverse Effect.

                                   ARTICLE V
                              CONDITIONS TO CLOSING

      5.1 MUTUAL CLOSING CONDITIONS. Each Purchaser's obligation to purchase and
pay for its Securities at the Closing and at each Subsequent Closing, and the US
Company's (or the Canadian Company's following any Exchange Event) obligation to
issue the Securities to the Purchasers and perform its other obligations
hereunder at the Closing and at each Subsequent Closing, shall be subject to the
fulfillment to such party's satisfaction (or waiver in writing by the Company
and such Purchaser on or before the applicable Closing Date or Subsequent
Closing Date, as the case may be) of the following conditions:

      5.1.1 WAITING PERIODS. All applicable waiting periods, if any, under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
ACT"), the Competition Act (Canada) and the Investment Canada Act shall have
expired or been terminated.

      5.1.2 NO ORDER. No preliminary or permanent injunction or other order or
decree by any court or administrative or regulatory body which prevents the

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consummation of the transactions contemplated hereby at the Closing or the
applicable Subsequent Closing, as the case may be, shall have been issued and
remain in effect (the US Company, the Canadian Company and the Purchasers
agreeing to use their reasonable best efforts to have any such injunction, order
or decree lifted).

      5.1.3 CONSENTS. All governmental waivers, consents, certificates, orders
and approvals required, or reasonably requested by the Purchasers, if any, under
the Competition Act (Canada) and the Investment Canada Act for the consummation
of the transactions contemplated hereby at the Closing or the applicable
Subsequent Closing or in connection with the ownership of the Conversion Shares,
as the case may be, shall have been obtained and be in effect. All other
authorizations, approvals or permits, if any, that are required in connection
with the lawful issuance, sale and effectiveness of the Securities pursuant to
this Agreement, the exercise of the Warrants for Conversion Shares, the issuance
of the Conversion Shares, any Exchange Event or any of the other transactions
contemplated in any Transaction Document shall have been duly obtained and shall
be in full force and effect on and as of the Closing Date and/or the relevant
Subsequent Closing Date, as applicable.

      5.1.4 NO CONFLICTING LAWS. No statute, rule or regulation shall have been
enacted by any state, provincial, territorial or federal government or
governmental agency which would prevent the consummation of the transactions at
the Closing or the applicable Subsequent Closing contemplated hereby.

      5.2 CONDITIONS TO CLOSING OF THE PURCHASERS. Each Purchaser's obligation
to purchase the Securities to be purchased by it at the Closing and at each
Subsequent Closing is subject to the fulfillment to its satisfaction on or prior
to the date of the Closing or such Subsequent Closing, as the case may be, (or
waived in writing by such Purchaser in its sole discretion on or before the
applicable Closing Date or Subsequent Closing Date, as the case may be) of each
of the following conditions:

      5.2.1 REPRESENTATIONS AND WARRANTIES CORRECT. The representations and
warranties made by the US Company and the Canadian Company herein and pursuant
hereto shall have been true and correct in all respects when made and shall be
true and correct in all respects as of the Closing Date with the same force and
effect as if made as of the Closing Date; except for such failure to be true and
correct as would not, individually or in the aggregate, have a Material Adverse
Effect (but disregarding for such purposes limitations on such representations
and warranties based on "materiality" or "Material Adverse Effect") and except
to the extent such representations and warranties are expressly made as of an
earlier date, in which case, such representations and warranties shall be true
and correct as of that date.

      5.2.2 PERFORMANCE. All covenants, agreements and conditions contained in
this Agreement to be performed or complied with by the US Company and the
Canadian

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Company on or prior to the Closing or any given Subsequent Closing, as
the case may be, shall have been performed or complied with in all material
respects and at such time the US Company and the Canadian Company shall not be
in default in the performance of or compliance with any of the provisions of
this Agreement, the terms of the Preferred Shares or any of the other
Transaction Documents.

      5.2.3 COMPLIANCE CERTIFICATE. Each of the US Company and the Canadian
Company shall have delivered to the Purchasers a certificate of the Chief
Executive Officer of each such Company (or such other officer as may be
acceptable to the Purchasers), dated the Closing Date or the relevant Subsequent
Closing Date, as applicable, certifying to the fulfillment of the conditions
specified in Sections 5.2.1, 5.2.2, and 5.2.7(a) of this Agreement.

      5.2.4 OPINION OF COMPANY'S COUNSEL. Such Purchaser shall have received
from each of (i) Shearman & Sterling and (ii) Blake, Cassels & Graydon LLP, an
opinion addressed to the Purchasers, dated the Closing Date or such Subsequent
Closing Date, covering on a collective basis the matters set forth in EXHIBIT D
hereto, in form and substance satisfactory to the Purchasers.

      5.2.5 PROCEEDINGS AND DOCUMENTS. All corporate and other proceedings in
connection with the transactions contemplated by this Agreement and the other
Transaction Documents and all documents and instruments incident to such
transactions shall be reasonably satisfactory in substance and form to such
Purchaser and its counsel.

      5.2.6 ADDITIONAL CONDITIONS APPLICABLE TO THE CLOSING. On or prior to the
Closing Date:

      (a) the closings under the Omni Agreements shall have occurred without
waiver of any material closing condition set forth therein and in accordance
with applicable law, and the Purchasers shall have received the most recent
regularly prepared balance sheet and income statement of Omni;

      (b) the Canadian Company shall have entered into an amendment (the "CREDIT
AGREEMENT AMENDMENT") of that certain Credit Agreement, dated as of June 27,
2002 (such agreement, as amended from time to time, and as the same may be
amended, restated, supplemented, refinanced or replaced or otherwise modified by
another Bank Credit Facility (as defined in the Certificate of Designations),
the "CREDIT AGREEMENT"), between the Canadian Company and Bank of America, N.A.
(Canada Branch), as Administrative Agent, Canadian Imperial Bank of Commerce, as
Managing Agent, and various Lenders (as defined therein), in form and substance
satisfactory to the Purchasers, which Credit Agreement Amendment shall become
effective upon the Closing and the Purchasers shall have received a true and
complete copy of the Credit Agreement Amendment;

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      (c) the US Company and the Canadian Company shall have executed and
delivered the Registration Rights Agreement substantially in the form set forth
in EXHIBIT E hereto;

      (d) George E. Matelich and Michael B. Lazar, as representatives of the
holders of the Preferred Shares, shall have been elected to the Board of
Directors of the US Company effective upon the Closing and they (or their
successors designated by the Purchasers) shall remain on the board in accordance
with the terms of the Preferred Shares;

      (e) the Companies shall have entered into a financial advisory agreement
with Kelso & Company, and, pursuant to such agreement, shall have paid
$1,650,000 to Kelso & Company by wire transfer of immediately available funds;
and

      (f) the Companies shall have discussed the transactions contemplated
hereby with NASDAQ and NASDAQ shall not have objected to the terms of the
transaction in light of applicable NASDAQ rules applicable to listed companies
and shall have provided such confirmation to the Purchasers.

      5.2.7 ADDITIONAL CONDITIONS APPLICABLE TO THE SUBSEQUENT CLOSINGS. On or
prior to any given Subsequent Closing Date:

      (a) the Canadian Company, the US Company and their Subsidiaries shall not
have suffered any Material Adverse Effect after the Closing Date;

      (b) in the case of any Subsequent Closing, the US Company shall have paid
to Kelso & Company by wire transfer of immediately available funds an amount
equal to 3.0% multiplied by the product of (x) the number of Preferred Shares to
be purchased and sold at such Subsequent Closing and (y) $1,000; and

      (c) Purchasers shall have approved in writing in their sole discretion the
proposed use of proceeds from the sale of Securities at such Subsequent Closing
(including, to the extent such proceeds will be used to finance a Subsequent
Acquisition (as defined in Section 6.1(c)), the terms and conditions of such
Subsequent Acquisition and the documentation relating thereto).

      5.3 CONDITIONS TO CLOSING OF THE US COMPANY. The US Company's obligation
to sell the Securities to be purchased by each Purchaser at the Closing is
subject to the fulfillment to the US Company's satisfaction on or prior to the
Closing and each Subsequent Closing, as the case may be, (or waived in writing
by the US Company in its sole discretion on or before the Closing Date or
applicable Subsequent Closing Date, as the case may be) of the following
conditions:

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      5.3.1 REPRESENTATIONS AND WARRANTIES CORRECT. In the case of the Closing
Date, the representations and warranties made by such Purchaser shall have been
true and correct in all respects when made and shall be true and correct in all
respects as of the Closing Date with the same force and effect as if made as of
the Closing Date, except for such failure to be true and correct as would not,
individually or in the aggregate, have a Purchaser Adverse Effect (but
disregarding for such purposes limitations on such representations and
warranties based on "materiality" or "Purchaser Adverse Effect") and except to
the extent such representations and warranties are expressly made as of an
earlier date, in which case, such representations and warranties shall be true
and correct as of that date.

      5.3.2 PERFORMANCE. All covenants, agreements and conditions contained in
this Agreement to be performed or complied with by such Purchaser on or prior to
the Closing Date and each Subsequent Closing Date, as the case may be, shall
have been performed or complied with in all respects and at such time such
Purchaser shall not be in default in the performance of or compliance with any
of the provisions of this Agreement.

                                   ARTICLE VI
                                   AGREEMENTS

      6.1 CONDUCT OF BUSINESS BY THE COMPANIES; UPDATED DISCLOSURE; SUBSEQUENT
ACQUISITIONS.

      (a) Each of the US Company and the Canadian Company covenants and agrees
that, prior to the Closing Date or earlier termination of this Agreement as
provided herein (except as expressly contemplated by this Agreement, the other
Transaction Documents, the Omni Agreements and the Migration), each of the US
Company and the Canadian Company shall, and shall cause their respective
Subsidiaries to, act and carry on their respective businesses in the ordinary
course of business consistent with past practice and use its and their
respective reasonable best efforts to preserve intact their current material
business organizations, keep available the services of their current officers
and employees (except for terminations of employees in the ordinary course of
business) and preserve their material relationships with others having business
dealings with them.

      (b) For purposes of any Subsequent Closing, any party may, no later than
10 days prior to a Subsequent Closing Date, supplement or amend the Schedule of
Exceptions with respect to any matter arising after the date of the Closing (or
last Subsequent Closing) preceding such Subsequent Closing which does not arise
from or in connection with any breach of this Agreement or any other Transaction
Document and which, if existing or occurring at the date hereof, would have been
required to be set forth or described in such Schedule of Exceptions. Purchasers
shall have the right to review

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<Page>

and comment on and/or reject any such supplemental or amended disclosure that
either Purchaser reasonably believes is inadequate, whether because such update
is open-ended, ambiguous, incomplete, inaccurate or unresponsive to the
representations and warranties. Any matter disclosed and accepted in accordance
with the immediately preceding sentence shall not, to the extent so disclosed,
form the basis for any claim for indemnification pursuant to Section 7 hereof if
the applicable Subsequent Closing occurs. The Purchasers will have a
corresponding right to update their respective Schedule of Exceptions.

      (c) If either Company identifies a business that it wishes to acquire and
wishes to finance such acquisition, in whole or in part, with proceeds from a
sale of Subsequent Securities hereunder (any such proposed acquisition, a
"SUBSEQUENT ACQUISITION"), such Company will promptly notify the Purchasers in
writing and permit the Purchasers, to the extent they so request, (i) to conduct
a due diligence investigation regarding such Subsequent Acquisition to the
extent that either Company conducts such due diligence investigation and is
permitted to allow the Purchasers access thereto and (ii) to have access to such
information relating to the Companies and their Subsidiaries that the Purchasers
consider relevant to their evaluation of the Subsequent Acquisition in light of
the condition and affairs of the Companies and their Subsidiaries at such time.

      6.2 USE OF PROCEEDS. The US Company will use the proceeds from the sale of
the Securities to fund the acquisitions pursuant to the Omni Agreements, to pay
fees and expenses associated with the offering and sale of the Securities and
for other general corporate purposes. The US Company (or after an Exchange
Event, the Canadian Company) will use the proceeds from the sale of the
Subsequent Securities in the manner agreed to by such Company and the Purchasers
as contemplated by clause (c) of Section 5.2.7. For the avoidance of doubt, the
proceeds from the sale of Subsequent Securities in the Special Migration Closing
shall not be subject to clause (c) of Section 5.2.7.

      6.3 AVAILABILITY OF COMMON SHARES. Each Company will reserve 19,000,000
Common Shares for issuance upon exercise of the Warrants (including any warrants
issuable in connection with any Exchange Event and any warrants issuable as
provided in Section 6.7(c)). Neither Company will issue or agree to issue any
Common Shares or options, rights or warrants to purchase Common Shares or
securities convertible into or exchangeable for Common Shares or take any other
action if, after giving effect thereto, the number of Common Shares remaining
unissued and duly reserved for issuance upon exercise of the Warrants shall be
insufficient to permit exercise of all of the Warrants (including in connection
with any Exchange Event and any warrants issuable as provided in Section
6.7(c)).

      6.4 LISTING OF CONVERSION SHARES. Prior to the Migration, the US Company
shall file with the Nasdaq Small Cap Market a listing application relating to
its Common Shares that shall include the Conversion Shares of the US Company.
Immediately upon

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any Exchange Event, the Canadian Company shall file with the Nasdaq Small Cap
Market a supplemental listing application relating to the conversion shares of
the Canadian Company that would be issuable upon exercise of warrants in the
Canadian Company issued in connection with an Exchange Event. The Company shall
use its reasonable best efforts to cause any such Conversion Shares referred to
in the prior two sentences to be listed on the Nasdaq Small Cap Market as soon
as practicable after the date of filing, subject only to official notice of
issuance, evidence of which shall be delivered by the Company to each of the
Purchasers promptly following receipt thereof.

      6.5 REPORTING REQUIREMENTS UNDER THE EXCHANGE ACT. Each of the US Company
and the Canadian Company, as applicable, shall timely file such information,
documents and reports as it may be required to file under Section 13 or 15 of
the Exchange Act. Each of the US Company and the Canadian Company acknowledges
and agrees that the purposes of the requirements contained in this Section 6.5
are to enable the Purchasers to comply with the current public information
requirement contained in paragraph (c) of Rule 144, if applicable, should any
such Purchaser ever wish to dispose of any of the Conversion Shares without
registration under the Securities Act in reliance upon Rule 144 (or any other
similar exemptive provision).

      6.6 EXCHANGE ACT FILINGS. Each of the US Company and the Canadian Company,
as applicable, shall deliver to each Purchaser, as soon as practicable after the
filing thereof, all filings made under the Exchange Act and amendments thereto
filed by the US Company and the Canadian Company, as applicable, with the SEC.

      6.7 MIGRATION.

      (a) Each of the US Company and the Canadian Company shall take the actions
described in EXHIBIT C hereto and shall use their reasonable best efforts to
take all actions necessary or advisable and permitted by applicable law to
complete the Migration on or before March 31, 2004 (the "MIGRATION OUTSIDE
DATE") in compliance with all applicable laws and regulations. Each of the US
Company and the Canadian Company shall update the Purchasers regularly on the
terms and conditions of and progress made towards consummating such Migration.

      (b) Notwithstanding anything herein to the contrary, if the Migration does
not occur on or prior to the Migration Outside Date, the Purchasers shall have
the right to require the Canadian Company at any time following the expiration
of the Consultation Period (as defined below) upon request by the Purchasers, to
(x) exchange the Preferred Shares for preferred shares in the capital of the
Canadian Company having the revised terms set forth on EXHIBIT F hereto and (y)
exchange the Warrants (including any Warrants issued pursuant to Section 6.7(c))
for warrants to purchase common shares in the capital of the Canadian Company
having the revised terms set forth on EXHIBIT G hereto (with appropriate
adjustments for the Warrants issued under Section 6.7(c)), and in

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each case having economic and other rights and preferences with respect to the
Canadian Company and its Subsidiaries that are substantially identical to those
applicable to the US Company and its Subsidiaries immediately prior to such
exchange (any such exchange, an "EXCHANGE EVENT"). If the Migration does not
occur by the second anniversary of the Closing Date, the US Company will have
the right to require that the Purchasers participate in an Exchange Event.
Following any such Exchange Event, all references to any of the Securities or
the Conversion Shares herein shall be deemed to refer to the new securities or
conversion shares, respectively, of the Canadian Company issued in connection
with the Exchange Event or thereafter. "CONSULTATION PERIOD" means a 60 day
period following the Migration Outside Date, during which period the Companies
and the Purchasers shall discuss in good faith whether there are structuring
alternatives to an Exchange Event that would preserve for the Purchasers the
economic and other rights associated with direct ownership of Securities and
Conversion Shares issued by the Canadian Company that could be achieved without
an exchange of Securities and Conversion Shares issued by the US Company,
subject to the right of the Purchasers in their sole discretion to reject any
such alternatives.

      (c) If the Migration does not occur on or prior to the Migration Outside
Date, the US Company will issue to the Purchasers, on such date and for each
calendar month period following such date until the Migration is consummated, an
additional 250,000 Share Warrants (allocated based upon the same percentage
reflected on the Schedule of Purchasers), in the form set forth as EXHIBIT H
subject to an aggregate cap of the lower of (i) 6,000,000 additional Share
Warrants issued under this Section 6.7(c) and (ii) any applicable limitation
under the NASDAQ rules regarding the issuance of capital stock upon exercise of
such Warrants without stockholder approval, provided that the foregoing
obligation to issue additional Warrants will not apply to the extent the failure
of the Migration to occur on or prior to the Migration Outside Date results
solely from the failure of the Special Migration Closing to occur due to an
unsatisfied condition under Section 5.1 which has not been waived by Purchasers
and which, if waived by Purchasers, would permit the Special Migration Closing
to occur, and provided further that the failure of the Special Migration Closing
to occur did not result in whole or in part from a breach of the Companies'
obligations under this Agreement (the failure of the Migration to occur under
such circumstances, other than as set forth in the immediately proceeding
proviso, an "EXCUSING EVENT").

      (d) Except as provided in the Transaction Documents or as part of the
Migration, the US Company will not issue, sell or grant equity securities or
engage in stock splits, stock combinations, reclassifications or similar events
prior to the earlier of the Migration or an Exchange Event, it being the intent
of the parties that upon the consummation of the Migration or an Exchange Event,
the ownership interest of the Purchasers represented by the common stock
issuable upon exercise of the Warrants in the US Company (in the event of a
Migration) or in the Canadian Company (in the event of an Exchange Event) would
be the same as if the Warrants issued prior to such event

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had been issued by the Canadian Company and Section 6 of the Warrant Agreement
relating to the Warrants will be interpreted to give effect to this intention.

      (e) During the Consultation Period, the Company will obtain any corporate
or other approvals or consents necessary to implement an Exchange Event, if
required by Purchasers, as of the end of such Consultation Period.

      6.8 OMNI OPERATIONS. Each of the US Company and the Canadian Company shall
use its reasonable best efforts to cause Omni to complete construction of the
landfill in Osceola County, Florida acquired pursuant to the Omni Agreements
(the "OMNI LANDFILL"), to obtain all required permits and other authorizations
from governmental authorities and to commence fully its landfill operations, in
each case as soon as practicable.

      6.9 SPECIAL MEETING. The Canadian Company shall use its reasonable best
efforts to take all actions necessary or advisable and permitted by applicable
law and such Company's articles and By-Laws to obtain the Shareholder Approval
on or before August 31, 2003, including, without limitation, (i) holding a
special meeting as promptly as practicable for the purpose of voting upon the
approval of the relevant issuances of Canadian Common Shares (it being
understood that it is currently the Company's intention to seek approval of the
Migration at such meeting) and also to seek approval of the issuance of
Preferred Shares upon an Exchange Event (to the extent a new class of Preferred
Stock will be issued under the circumstances described in Exhibit G hereto),
(ii) recommending that the securityholders of the Company vote to approve such
issuances, and (iii) securing the requisite vote of securityholders for such
issuances and in connection therewith shall solicit proxies and provide proxy
statements to the shareholders of the Company in accordance with applicable
corporate and securities laws.

      6.10 EFFORTS TO CONSUMMATE TRANSACTION; AGREEMENT TO COOPERATE.

      (a) Subject to the terms and conditions herein provided, each of the
parties hereto shall use its reasonable best efforts to take, or cause to be
taken, all action and to do, or cause to be done, and to assist and cooperate
with the other parties in doing, all things necessary, proper or advisable
consistent with applicable laws and regulations to consummate and make effective
the transactions contemplated by this Agreement; PROVIDED, however, that nothing
in this Section 6.10 shall require any Purchaser or either Company to agree to
any waiver or modification of this Agreement or any of the Transaction Documents
(including, without limitation, any waiver or modification of any of the closing
conditions set forth in Section 5) or any Purchaser to make an investment in
either Company that is greater than the amount set forth opposite the Schedule
of Purchasers.

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      (b) Without limiting the generality of the foregoing, and notwithstanding
anything in this Agreement to the contrary, each Company shall use its
reasonable best efforts to take or cause to be taken all reasonable action and
to do, or cause to be done, and to assist and cooperate with the other parties
hereto in doing, all things necessary, proper or advisable to obtain all
governmental waivers, consents, authorizations, orders and approvals, all
consents, amendments to or waivers from other parties under the terms of all
Material Contracts and all other material permits, concessions, franchises or
licenses applicable to such Company or its Subsidiaries required or advisable as
a result of the transactions contemplated by this Agreement, the other
Transaction Documents, the Omni Agreements, the Migration and the Exchange
Event. The Canadian Company shall enter into the Credit Agreement Amendment (as
defined in Section 5.2.6 and such Credit Agreement Amendment, to the extent not
already permitted by the Credit Agreement, shall permit the transactions
contemplated hereby, by the other Transaction Documents and the Omni Agreements
(other than the Migration).

      6.11 ACCESS; NOTIFICATION OF CERTAIN MATTERS.

      (a) Upon reasonable notice, each of the US Company and the Canadian
Company shall afford the Purchasers and their representatives reasonable access
during normal business hours to the offices, properties, books, records and
personnel of the US Company, the Canadian Company and their respective
Subsidiaries and such additional information concerning the business and
properties of the US Company, the Canadian Company and their respective
Subsidiaries as the Purchasers and their representatives may reasonably request,
PROVIDED, however, that the Purchasers and their representatives shall under no
circumstances conduct any type of sampling or analysis of any environmental
media or building material, or conduct any other Phase II-type investigation,
without the written consent of the Companies, such consent to be withheld in the
Companies' sole and absolute discretion. Each of the US Company and the Canadian
Company shall instruct its and its respective Subsidiaries' employees, counsel
and financial advisors to cooperate with the Purchasers in their investigation
of the business of the US Company, the Canadian Company and their respective
Subsidiaries.

      (b) Between the date hereof and the Closing or the earlier termination of
this Agreement as provided herein, the Companies shall promptly (and in any
event within two (2) business days after obtaining knowledge thereof) notify the
Purchasers of any action or event which individually or in the aggregate could
reasonably be expected to have a Material Adverse Effect.

      6.12 TERMINATION. This Agreement may be terminated and the other
transactions contemplated by this Agreement may be abandoned at any time prior
to the Closing Date pursuant to a written notice of such termination, as
follows:

      (a) by mutual written consent of the US Company and the Purchasers;

                                     xxxii

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      (b) by either the US Company or the Purchasers if the Closing shall not
have occurred on or before May 30, 2003; PROVIDED, however, that the right to
terminate this Agreement under this Section 6.12(b) shall not be available to
any party whose breach has caused the failure of the Closing to occur on or
before such date;

      (c) by either the US Company or the Purchasers if there shall be any
restraining order, injunction or other order issued by any court of competent
jurisdiction or other legal restraint or prohibition preventing the Closing or
any of the other transactions contemplated hereby or by the other Transaction
Documents which is final and nonappealable;

      (d) by the Purchasers, upon a breach of any representation, warranty,
covenant or agreement on the part of the US Company or the Canadian Company set
forth in this Agreement, or if any representation or warranty of the US Company
or the Canadian Company shall have become untrue, such that the conditions set
forth in Section 5.2 would not be satisfied ("TERMINATING COMPANY BREACH");
PROVIDED, however, that if such Terminating Company Breach is curable by the US
Company or the Canadian Company through the exercise of its reasonable best
efforts and for as long as the US Company or the Canadian Company continues to
exercise such efforts, but not beyond the date specified in paragraph (b) above,
the Purchasers may not terminate this Agreement under this Section 6.12(d); or

      (e) by the US Company, upon a breach of any representation, warranty,
covenant or agreement on the part of either Purchaser set forth in this
Agreement, or if any representation or warranty of either Purchaser shall have
become untrue, such that the conditions set forth in Section 5.3 would not be
satisfied ("TERMINATING PURCHASER BREACH").

      6.13 EFFECT OF TERMINATION. In the event of termination of this Agreement
pursuant to Section 6.12, this Agreement shall forthwith become void, there
shall be no liability under this Agreement on the part of the Purchasers, the US
Company or the Canadian Company, and all rights and obligations of each party
hereto shall cease, other than the obligations set forth in Section 6.14 hereof;
PROVIDED, however, that nothing herein shall relieve any party from liability
for any willful or intentional breach of this Agreement.

      6.14 CONFIDENTIAL INFORMATION. The US Company, the Canadian Company and
each Purchaser for themselves, their respective directors, officers, employees,
affiliates, agents and representatives covenant with each other that they each
will use all non-public information provided by or relating to the other parties
acquired by them pursuant to the provisions of this Agreement or in the course
of negotiations with, or examinations of, the other parties (the "CONFIDENTIAL
INFORMATION") only in connection with the transactions contemplated hereby and
not in any way detrimental to the other parties and

                                     xxxiii

<Page>

shall cause the Confidential Information obtained by them pursuant to this
Agreement and such negotiations and examinations to be treated as confidential,
except as may otherwise be required by law or the rules or regulations of Nasdaq
or as may be necessary or appropriate in connection with the enforcement of this
Agreement or any instrument or document referred to herein or contemplated
hereby, and provided that to the extent that any such party or any affiliate
thereof may become legally compelled to disclose any Confidential Information,
such party shall give notice to and consult with the party providing such
information prior to disclosing such information. Notwithstanding the foregoing
no recipient of Confidential Information (each, a "RECIPIENT") shall be required
to maintain the confidentiality of Confidential Information that (i) is or
becomes generally available to the public other than as a result of disclosure
by the Recipient or any party to whom the Recipient has disclosed such
information; (ii) is obtained by the Recipient, on a non-confidential basis,
from a third party that the Recipient does not know to be prohibited from
disclosing such information or (iii) is already known by the Recipient at the
time such information is received by the Recipient. In the event of termination
of this Agreement, upon written notice, each Recipient will cause to be
destroyed or delivered to the party providing such information all documents,
work papers and other material containing Confidential Information obtained by
it from such party, whether so obtained before or after the execution of this
Agreement. Notwithstanding the foregoing, Confidential Information shall be
deemed not to include the tax structure and tax treatment of the transactions
contemplated by this Agreement (including the Migration), and each party may
disclose the tax structure and tax treatment of such transactions, and may
provide any materials in its possession relating to such tax structure and tax
treatment (including tax opinions), to any Person without limitation.

      6.15 TAX COVENANTS. (a) Except as required by a change in law or
administrative or judicial interpretation thereof, KIA, KEP, the U.S. Company
and the Canadian Company shall report (including by virtue of withholding) the
U.S. federal income tax consequences associated with the Preferred Shares and
the Warrants in accordance with this Section 6.15. For U.S. federal income tax
purposes: (i) the Preferred Shares shall be treated as "common stock" (and not
as "preferred stock") for purposes of Section 305 of the Code and, as such, the
Preferred Shares shall be treated as not subject to the "redemption premium"
rules under Section 305 of the Code and (ii) any accrued and unpaid dividends
that increase the "Liquidation Preference" (as defined in the Certificates of
Designation) of any Preferred Share shall not be treated as distributions under
Section 305 of the Code until such dividends are actually declared by the Board
of Directors and paid by the Company.

      (b) In the event that the Exchange Event occurs, (i) the US Company and
the Canadian Company shall use reasonable best efforts to structure such
exchange as a reorganization under Section 368(a)(1)(B) of the Code in which the
Purchasers do not recognize for U.S. federal income tax purposes any gain
inherent in the exchanged Preferred Shares or Warrants and shall treat such
exchange accordingly and (ii) the

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Canadian Company shall reasonably cooperate with the Purchasers in structuring
any redemption of the Preferred Shares of the Canadian Company following such
Exchange Event in a manner that reduces or eliminates any Canadian withholding
taxes. The Companies shall be deemed to have satisfied the requirements of
clause (i) of this Section 6.15(b) if (x) the Purchasers expressly approve in
writing the terms for structuring the Exchange Event as a reorganization under
Section 368(a)(1)(B) in which the Purchasers do not recognize for U.S. federal
income tax purposes any gain inherent in the exchanged Preferred Shares or
Warrants and (y) the Companies comply with (and such Exchange Event is
consummated in accordance with) such terms.

      (c) The Companies shall pay all documentary, registration or stamp Taxes
imposed by law in connection with the issuance, sale and delivery of the
Securities hereunder and shall comply with all laws imposing such Taxes.

      (d) The Purchasers shall provide the US Company and the Canadian Company
with all forms or certificates reasonably required or requested (in writing) for
Tax reporting purposes.

      (e) Neither the US Company nor the Canadian Company shall exercise its
right to redeem any Preferred Shares held by any Purchaser unless (i) such
Company redeems 100% of the Preferred Shares owned by the Purchasers, (ii) such
Company redeems a number of such Preferred Shares such that such redemption is
treated as "substantially disproportionate" (within the meaning of Section
302(b)(2) of the Code) with respect to such Purchaser or (iii) the Purchasers
determine in their reasonable discretion that such redemption will give rise to
exchange treatment under Section 302(b) of the Code. In addition, if either the
US Company or the Canadian Company redeems 100% of the Preferred Shares owned by
the Purchasers and the Purchasers intend to retain any Warrants following such
redemption, each of the Companies shall cooperate with the Purchasers in
structuring such redemption so that such redemption is treated as an exchange
under Section 302(b) of the Code. For the avoidance of doubt, the parties
acknowledge and agree that, assuming the requirements of this Section 6.15(e)
are satisfied, the US Company or the Canadian Company, as the case may be, shall
be entitled to redeem any Preferred Shares held by any Purchaser without regard
to any Canadian tax consequences resulting from such redemption. The Companies
shall be deemed to have satisfied the requirements of this Section 6.15(e) with
respect to any redemption if (x) the Purchasers expressly approve in writing the
terms for such redemption as giving rise to exchange treatment under Section
302(b) of the Code and (y) the Companies comply with (and such redemption is
consummated in accordance with) such terms.

      6.16 JOINT AND SEVERAL LIABILITY. The US Company and the Canadian Company
shall be jointly and severally liable for any agreement or covenant hereunder
(including, without limitation, the agreement to indemnify the Purchaser
Indemnitees under Article

                                      xxxv

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VII hereof) of a Company, the US Company or the Canadian Company and each such
agreement and covenant shall apply to and shall be deemed to have been agreed
to, on a joint and several basis, by each of the US Company and the Canadian
Company with respect to itself and with respect to the other.

      6.17 CERTIFICATE OF DESIGNATIONS; WARRANTS. From the Closing until any
Exchange Event, the Canadian Company agrees that it shall not, and shall not
permit any of its Subsidiaries to, take any of the actions specified in Section
5(b) of the Certificate of Designations and shall comply with Section 5(e) of
the Certificate of Designations (assuming for this purpose that references in
the Certificate of Designations to the "Corporation" also refer to the Canadian
Company, MUTATIS MUTANDI) without receipt of the approval contemplated thereby.
Similarly, during such period the Canadian Company will comply with Sections 7
and 9 of the Warrant Agreement relating to the Warrants. The US Company agrees
that it will comply with its obligations under the Certificate of Designations
as if such terms were set forth in full in this Agreement.

      6.18 DIVIDENDS. The Canadian Company and the US Company agree not to
declare or pay any dividend on the Preferred Shares without the written consent
of (i) the Purchasers and (ii) for so long as the Credit Agreement is in effect,
the Administrative Agent (as defined in the Credit Agreement), it being agreed
that solely for purposes of this Section 6.18, the term Credit Agreement shall
include any successor credit agreement entered into to refinance the Credit
Agreement. Notwithstanding Section 7.11, the foregoing sentence may not be
amended without the consent of the Administrative Agent.

                                   ARTICLE VII
                                 INDEMNIFICATION

      7.1 INDEMNIFICATION BY THE COMPANY. The US Company and the Canadian
Company shall indemnify, defend and hold harmless each Purchaser and its direct
or indirect shareholders, partners, members, directors, managers, officers,
employees, agents, representatives and affiliates, without duplication (such
Purchaser and the foregoing related parties, collectively, the "PURCHASER
INDEMNITEES") from and against all damages, losses, liabilities, claims,
actions, suits, proceedings, judgments, Taxes, penalties, fines, costs and
expenses (including, without limitation, reasonable attorneys' fees and
expenses), whether or not resulting from a third party claim (all of the
foregoing hereinafter collectively referred to as a "LOSS") incurred by any of
the Purchaser Indemnitees arising out of or as a result of: (i) any
misrepresentation or breach of warranty made by the US Company or the Canadian
Company herein or in any document or certificate delivered pursuant hereto, it
being understood that all representations and warranties will be deemed restated
as of each Subsequent Closing (incorporating any update to the Schedule of
Exceptions that has been delivered and accepted in accordance with Section
6.1(b)) with respect to the Securities sold at such Subsequent Closing; and
(ii) any breach or nonfulfillment of any agreement or covenant made by the
US Company

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or the Canadian Company herein or in any document or certificate delivered
pursuant hereto.

      7.2 INDEMNIFICATION BY THE PURCHASERS. Each Purchaser, on a several and
not joint basis, shall indemnify, defend and hold harmless the US Company and
the Canadian Company and its direct or indirect shareholders, directors,
officers, employees, agents, representatives and affiliates, without duplication
(the "COMPANY INDEMNITEES") from and against all Losses incurred by any of the
Company Indemnitees arising out of or as a result of: (i) any misrepresentation
or breach of warranty made by such Purchaser herein or in any document or
certificate delivered pursuant hereto; and (ii) any breach or nonfulfillment of
any agreement or covenant made by such Purchaser herein or in any document or
certificate delivered pursuant hereto.

      7.3 LIMITATIONS ON INDEMNIFICATION. No right to indemnification may be
asserted under clause (i) of Section 7.1 or clause (i) of Section 7.2 (x) in
respect of the representations and warranties set forth in Sections 3.6, 3.8,
3.10, 3.15, 3.19, 3.24 and 3.25, after the expiration of 12 months following the
Closing Date or a Subsequent Closing Date, as the case may be, except any such
rights to indemnification arising out of or in connection with any claim as to
which notice has been given on or prior to the expiration of 12 months following
the Closing Date or such Subsequent Closing Date, as the case may be, or (y) in
respect of any other representations and warranties set forth in this Agreement,
after the Closing Date or such Subsequent Closing Date, as the case may be.
Notwithstanding anything herein to the contrary, a right to indemnification for
breach of the representations and warranties set forth in Sections 3.1, 3.2,
3.4, 3.5, 3.23, 4.1, 4.2, 4.3, 4.4 and 4.5 may be asserted under this Article
VII indefinitely. Notwithstanding anything to the contrary herein, nothing in
this Agreement shall limit in any way any party's remedies in respect of fraud
or intentional misrepresentation or omission or an intentional breach of this
Agreement.

      7.4 NOTICE AND DEFENSE OF CLAIMS. The following provisions shall only
apply in the event of a third-party claim.

      (a) If any action or proceeding be commenced, or if any claim, demand or
assessment be asserted, in respect of which any party (an "INDEMNITEE") proposes
to hold any other party (the "INDEMNITOR") liable under the indemnity provisions
of this Article VII (a "CLAIM"), such Indemnitee shall notify the Indemnitor in
writing of such Claim in a timely manner and, in any event, within any
applicable time period specified in Section 7.3; PROVIDED, however, that, so
long as such notice is given within the applicable time period specified in
Section 7.3, an Indemnitee's failure to give timely notice to an Indemnitor
shall not constitute a defense (in whole or in part) to any claim for
indemnification by such Indemnitee unless, and only to the extent that, such
failure results in material prejudice to the Indemnitor. Such Indemnitor shall
be entitled, at its sole cost and expense, to contest or defend the same with
counsel of its own choosing,

                                     xxxvii

<Page>

reasonably acceptable to such Indemnitee, and such Indemnitee shall not admit
any liability with respect thereto or settle, compromise, pay or discharge the
same without the prior written consent of the Indemnitor, not to be unreasonably
withheld, and such Indemnitee (and its successors and assigns) shall cooperate
with the Indemnitor in the contest or defense thereof (and the Indemnitor shall
reimburse such Indemnitee for such Indemnitee's reasonable actual out-of-pocket
expenses incurred in connection with such cooperation) and such Indemnitee shall
enter into any settlement with respect thereto recommended by the Indemnitor so
long as (i) the amount of such settlement is paid by the Indemnitor, (ii) no
obligation to perform or refrain from performing any act or to admit to any
fault shall be imposed upon such Indemnitee by reason thereof and (iii) such
settlement otherwise is reasonable under the applicable circumstances.

      (b) If (i) the Indemnitee shall have given the Indemnitor at least 30 days
prior written notice that, in the event the Indemnitor fails to assume the
defense of any Claims as provided in Section 7.4(a), such Indemnitee intends to
assume the defense of such Claim and (ii) the Indemnitor fails to assume the
defense of such Claim as provided in Section 7.4(a) by the end of such thirty
(30) day period or such later reasonable time (which shall be such period of
time as will not result in material prejudice to the rights of such Indemnitee),
then such Indemnitee shall have the right to prosecute and conduct its own
defense by counsel of its choice (including appropriate local counsel), and in
connection therewith shall have full right to conduct the defense thereof and to
enter into any compromise or settlement thereof with the consent of the
Indemnitor (which shall not unreasonably be withheld, conditioned or delayed).
Such defense shall be at the reasonable cost and expense of the Indemnitor and
the Indemnitor shall reimburse such Indemnitee promptly and periodically for the
reasonable costs of defending against such Claim. Notwithstanding Section 7.4(a)
and the foregoing sentence, any Indemnitee shall be entitled to conduct its own
defense at the reasonable cost and expense of the Indemnitor if not doing so
would materially prejudice such Indemnitee by virtue of a conflict between the
interests of such Indemnitee and the Indemnitor, and provided further that in
any event such Indemnitee may participate in such defense at its own expense.

      7.5 EXCLUSIVE REMEDIES. Following the Closing, the indemnification
provisions of Sections 7.1 and 7.2, subject to Section 7.3, shall be the sole
and exclusive remedies for the Purchasers and the Companies, as applicable, for
any breach by the other party of the representations and warranties in this
Agreement and for any failure by the other party to perform and comply with any
covenants and agreements contained in this Agreement which by their terms are
required to be performed on or before the Closing. No breach of any
representation, warranty, covenant or agreement contained herein shall give rise
to any right on the part of the Purchasers, on the one hand, or the Companies,
on the other hand, after the consummation of the purchase and sale of the
Initial Securities contemplated by this Agreement, to rescind this Agreement or
any of the transactions contemplated by the other Transaction Documents.

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<Page>

      7.6 LIMITATION OF LIABILITY. Neither the Purchasers nor the Companies
shall have any liability under any provision of this Agreement or the other
Transaction Documents for any punitive, special or incidental damages.

      7.7 TREATMENT AS A PURCHASE PRICE ADJUSTMENT. Any indemnification payment
made pursuant to this Agreement and any Warrants issued pursuant to Section
6.7(c) shall be treated as an adjustment of the purchase price paid under this
Agreement.

      7.8 COMPUTATION OF CERTAIN LOSSES IN RESPECT OF TAXES. In the event that
any income or gain is recognized by any Purchaser Indemnitee in respect of the
investment in either Company by a Purchaser and such income or gain arises out
of or results from the breach or nonfulfillment of any agreement or covenant
made by the US Company or the Canadian Company in Section 6.15, the Loss of such
Purchaser Indemnitee for purposes of Section 7.1 shall be computed (i) based on
the highest marginal Tax rate generally applicable to such Purchaser Indemnitee
in respect of such type of income or gain (E.G., the applicable rate for a U.S.
individual in respect of long-term capital gain is generally 20% and the
applicable rate for a U.S. tax-exempt organization in respect of dividend income
is generally 0%), (ii) assuming that the only items of income, gain, loss and
deduction of such Purchaser Indemnitee are those arising from the investment in
either Company by such Purchaser and (iii) based on other reasonable assumptions
in light of the circumstances in which the indemnity arises such that the amount
of the Loss is computed without examining the actual Tax returns of the
Purchaser Indemnitee or the items thereon, PROVIDED, however, that the Loss
shall be computed without regard to any future reduction in Tax that such
Purchaser Indemnitee may realize as a result of any step-up in Tax basis
associated with the income or gain giving rise to such Loss.

                                  ARTICLE VIII
                                  MISCELLANEOUS

      8.1 GOVERNING LAW; SUBMISSION TO JURISDICTION; VENUE.

      (a) This Agreement shall be governed in all respects by the laws of the
State of New York, without giving effect to its principles or rules of conflicts
of laws, to the extent that such principles or laws would require the
application of the law of another jurisdiction.

      (b) Any legal action or proceeding with respect to this Agreement shall be
brought in the courts of the State of New York or of the United States for the
Southern District of New York, in each case physically located in the borough of
Manhattan, and, by execution and delivery of this Agreement, each party hereto
hereby irrevocably accepts for itself and in respect of its property, generally
and unconditionally, the

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exclusive jurisdiction of the aforesaid courts. Each party hereto hereby further
irrevocably waives any claim that any such courts lack personal jurisdiction
over it, and agrees not to plead or claim, in any legal action proceeding with
respect to this Agreement in any of the aforementioned courts, that such courts
lack personal jurisdiction over it. Each of the US Company and the Canadian
Company further irrevocably agrees that service of all writs, process and
summonses in any proceeding or any suit, action, proceeding to enforce or
execute any judgment brought against it in the State of New York may be made
upon CT Corporation System, presently located at 111 Eighth Avenue, New York,
New York 10011, U.S.A., which is hereby appointed agent of the US Company and
the Canadian Company for service of process in the State of New York with
respect to disputes arising under this Agreement.

      (c) Each party hereto hereby irrevocably waives any objection that it
may now or hereafter have to the laying of venue of any of the aforesaid actions
or proceedings arising out of or in connection with this Agreement brought in
the courts referred to in clause (b) above and hereby further irrevocably, to
the extent permitted by applicable law, waives its rights to plead or claim and
agrees not to plead or claim in any such court that any such action or
proceeding brought in any such court has been brought in an inconvenient forum.

      8.2 SURVIVAL. The representations, warranties, covenants and agreements
made herein shall survive any investigation made by the Purchasers and the
Closing and each Subsequent Closing to the extent provided in Section 7.3.

      8.3 SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided herein,
the provisions hereof shall inure to the benefit of, and be binding upon, the
successors of the parties hereto; PROVIDED, however, that the US Company and the
Canadian Company may not assign any of their rights hereunder. Prior to the
Closing, each Purchaser may assign any rights hereunder to any Affiliate of such
Purchaser. After the Closing, each Purchaser may assign any rights hereunder to
any transferee or assignee of such Purchaser's Securities; PROVIDED, however,
that no such assignment of rights shall relieve the Purchasers of any liability
hereunder.

      8.4 ENTIRE AGREEMENT; AMENDMENT. This Agreement (including, without
limitation, the Schedule of Exceptions and Exhibits hereto) and the other
documents delivered pursuant hereto constitute the full and entire understanding
and agreement among the parties with regard to the subjects hereof. No written
(except as explicitly stated therein) or oral statements made by or on behalf of
the Companies, other than in this Agreement, shall constitute representations or
warranties within the meaning of this Agreement. Neither this Agreement nor any
term hereof may be amended, waived, discharged or terminated, except by a
written instrument signed by the US Company and the Purchasers.

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<Page>

      8.5 NOTICES. All notices, requests, demands, letters, waivers and other
communications required or permitted to be given under this Agreement shall be
in writing and shall be deemed to have been duly given if (a) delivered
personally, (b) mailed, certified or registered mail with postage prepaid, (c)
sent by next-day or overnight mail or delivery or (d) sent by fax, as follows:

            If to the US Company or to the Canadian Company, to it at:

            Capital Environmental Resource Inc.
            1005 Skyview Drive
            Burlington, Ontario L7P 5B1
            Attention:  Thomas E. Durkin, III
            Facsimile:  (905) 319-9050

            with a copy (which shall not constitute notice) to:

            Shearman & Sterling
            599 Lexington Avenue
            New York, NY  10022
            Attention:  Stephen M. Besen, Esq.
            Facsimile:  (212) 848-7179

            with a copy (which shall not constitute notice) to:

            Blake, Cassels & Graydon LLP
            Suite 2800, Box 25
            Commerce Court West
            199 Bay Street
            Toronto, Ontario M5L 1A9
            Attention:  Alan Bell
            Facsimile:  (416) 863-2653

            If to the Purchasers, to them at:

            Kelso Investment Associates VI, L.P.
            KEP VI, LLC
            c/o Kelso & Company
            24th Floor
            320 Park Avenue
            New York, New York  10022
            Attention:  James J. Connors, II, Esq.
            Facsimile:  (212) 751-3939

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<Page>

            with a copy (which shall not constitute notice) to:

            Debevoise & Plimpton
            919 Third Avenue
            New York, NY 10022
            Attention:  Kevin M. Schmidt, Esq.
            Facsimile:  212-909-6836

      With notice thereof to the US Company, each Purchaser may change its
address or fax number for purposes of this Section 7.12.

      8.6 DELAYS OR OMISSIONS. No delay or omission to exercise any right, power
or remedy accruing to any holder of any Securities, upon any breach or default
of the US Company or the Canadian Company under this Agreement, shall impair any
such right, power or remedy of such holder nor shall it be construed to be a
waiver of any such breach or default, or an acquiescence therein, or of any
similar breach or default thereafter occurring; nor shall any waiver of any
single breach or default be deemed a waiver of any other breach or default
theretofore or thereafter occurring. Any waiver, permit, consent or approval of
any kind or character on the part of any holder of any Securities of any breach
or default under this Agreement, or any waiver on the part of any holder of any
Securities of any provisions or conditions of this Agreement must be made in
writing and shall be effective only to the extent specifically set forth in such
writing. All remedies, either under this Agreement or by law or otherwise
afforded to any holder shall be cumulative and not alternative.

      (a) RIGHTS; SEPARABILITY. In case any provision of this Agreement shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

      8.7 EXPENSES. The US Company and the Canadian Company shall bear their own
expenses and legal fees incurred on its behalf with respect to this Agreement
and the transactions contemplated hereby. Notwithstanding the foregoing, (i) the
US Company and/or the Canadian Company will pay at the Closing, at each
Subsequent Closing and from time to time upon demand by the Purchasers all
reasonable out-of-pocket fees, costs and expenses of the Purchasers (including,
without limitation, reasonable out-of-pocket fees and expenses of counsel to the
Purchasers) with respect to any purchase or sale of the Securities and (ii) the
US Company and/or the Canadian Company will pay any and all fees, costs or
expenses associated with any filing or notice required to be made under
applicable law in connection with any Securities, hereunder (including, without
limitation, under the HSR Act); PROVIDED, however, that the US Company and/or
the Canadian Company will only pay the fees, costs or expenses associated with
any filing or notice required to be made under the HSR Act, 1 (one) time and 1
(one) time in connection with any Change of Control (as defined in the
Certificate of Designations).

                                      xlii

<Page>

8.8 TITLES AND SUBTITLES. The titles of the paragraphs and subparagraphs of this
Agreement are for convenience of reference only and are not to be considered in
construing this Agreement.

8.9 COUNTERPARTS. This Agreement may be executed in any number of counterparts,
each of which shall be an original, but all of which together shall constitute
one and the same instrument.

                                     xliii

<Page>

      IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the
date first above written.

                                 WASTE SERVICES, INC.

                                 By: /s/ Thomas E. Durkin
                                    ------------------------------------
                                     Name:  Thomas E. Durkin III
                                     Title: Secretary

                                 CAPITAL ENVIRONMENTAL
                                 RESOURCE INC.

                                 By: /s/ Thomas E. Durkin
                                    ------------------------------------
                                     Name:  Thomas E. Durkin III
                                     Title: Secretary

                                 KELSO INVESTMENT ASSOCIATES VI, L.P.

                                 By:  Kelso GP VI, LLC
                                      Its General Partner

                                 By: /s/ George E. Matelich
                                    --------------------------------------
                                      Managing Member

                                   KEP VI, LLC

                                 By: /s/ George E. Matelich
                                    --------------------------------------
                                      Managing Member

                                      xliv<Page>

                                                                     EXHIBIT 4.5

                          REGISTRATION RIGHTS AGREEMENT

            This REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT") is made as of
May 6, 2003 among Waste Services, Inc., a Delaware corporation (the "COMPANY"),
Capital Environmental Resource Inc., a corporation amalgamated under the laws of
Province of Ontario ("CERI"), and the parties identified as Investors on
Schedule A hereto (each individually an "INVESTOR" and collectively the
"INVESTORS").

            WHEREAS, the Company, CERI and the Investors have entered into a
Preferred Subscription Agreement, dated as of May 6, 2003 (the "SUBSCRIPTION
AGREEMENT"), pursuant to which the Company is issuing and selling and, after the
date hereof, may issue and sell to the Investors (i) up to 100,000 of the
Company's preferred shares (the "INVESTOR SHARES") and (ii) warrants to purchase
Common Shares (as such term and other capitalized terms used herein without
definition are defined in Section 1), including those warrants issuable under
Section 6.7(c) of the Subscription Agreement ("WARRANTS");

            WHEREAS, the Company and CERI intend to consummate the Migration (as
such term is defined in the Subscription Agreement), pursuant to which CERI will
become an indirect subsidiary of the Company;

            WHEREAS, pursuant to the Subscription Agreement, in the event the
Migration does not occur on or prior to the Migration Outside Date (as such term
is defined in the Subscription Agreement), the Investors shall have the right,
subject to the terms of the Subscription Agreement, to require CERI (i) to
exchange the Investor Shares for preferred shares in the capital of CERI having
terms described in the Subscription Agreement and (ii) to exchange the Warrants
for warrants to purchase common shares in the capital of CERI having terms
described in the Subscription Agreement (any such exchange of Investor Shares
and Warrants, an "EXCHANGE EVENT"); and

            WHEREAS, the execution and delivery of this Agreement is a condition
to the closing of the Subscription Agreement.

            NOW, THEREFORE, in consideration of the mutual promises and
agreements set forth herein, the receipt and adequacy of which are hereby
acknowledged, the parties hereto agree as follows:

            1. DEFINITIONS. For purposes of this Agreement:

                  (a) "COMMON SHARES" means, subject to SECTION 12, shares of
the Company's common stock, par value $.01 per share.

                  (b) "EXCHANGE ACT" means the Securities Exchange Act of 1934,
as amended, and the rules and regulations of the SEC promulgated thereunder.

<Page>

                  (c) "HOLDER" means any Person owning or having the right to
acquire Registrable Securities, or any assignee thereof in accordance with
SECTION 11 hereof.

                  (d) "INITIATING HOLDERS" means the Holder(s) initiating a
registration request under SECTION 2(a) hereof.

                  (e) "INVESTOR REQUEST" means a request from a Holder or
Holders that in the aggregate beneficially own at least twenty-five percent
(25%) of the Registrable Securities outstanding as of the date of such request
that the Company file a registration statement under the Securities Act with
respect to the Registrable Securities; PROVIDED, HOWEVER that such request shall
be for not less than 2,000,000 Common Shares or if the remaining amount of
Registrable Securities owned by the Holders is less than 2,000,000 Common
Shares, such remaining amount.

                  (f) "MAJORITY IN INTEREST OF THE INITIATING HOLDERS" means
Initiating Holders holding a majority of the Registrable Securities held by all
Initiating Holders.

                  (g) "PERSON" means any individual, partnership, limited
liability company, unlimited liability company, joint venture, joint stock
company, unincorporated organization, corporation, association, trust or any
other entity or organization.

                  (h) "PRIOR AGREEMENTS" means (i) the Registration Rights
Agreement, dated as of September 7, 2001, by and between CERI and the investors
named therein; and (ii) the Registration Rights Agreement, dated as of February
6, 2002, by and between CERI and the investors named therein.

                  (i) "REGISTER," "REGISTERED," and "REGISTRATION" refer to a
registration effected by preparing and filing a registration statement or
similar document in compliance with the Securities Act, and the declaration or
ordering of effectiveness of such registration statement or document.

                  (j) "REGISTRABLE SECURITIES" means (1) any Common Shares
issuable upon exercise of the Warrants and (2) any Common Shares issued to an
Investor (or any assignee thereof in accordance with SECTION 11) as (or issuable
upon conversion or exercise of any warrant, right or other security which is
issued as) a dividend or other distribution with respect to, or in exchange for
or in replacement of, such Common Shares; PROVIDED, HOWEVER, that any
Registrable Securities sold by an Investor in a transaction in which such
Investor's rights under this Agreement are not assigned pursuant to SECTION 11
below shall cease to be Registrable Securities from and after the time of such
sale. In addition, any Common Shares shall cease to be Registrable Securities
from and after such time as they are sold to the public in a registered public
offering or pursuant to Rule 144 under the Securities Act.

                  (k) "SEC" means the United States Securities and Exchange
Commission.

                  (l) "SECURITIES ACT" means the Securities Act of 1933, as
amended, and the rules and regulations of the SEC promulgated thereunder.

                  (m) "VIOLATION" means any of the following statements,
omissions or violations: (i) any untrue statement or alleged untrue statement of
a material fact contained in a

                                       2

<Page>

registration statement filed pursuant to this Agreement, including any
preliminary prospectus or final prospectus contained therein or any amendments
or supplements thereto or any documents filed under state securities or "blue
sky" laws in connection therewith, or (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein, in light of the circumstances under which such
statements were made, not misleading.

            2. REQUEST FOR REGISTRATION.

                  (a) If the Company shall receive a written Investor Request
after the earlier to occur of (i) the Migration or (ii) an Exchange Event, then
the Company shall, within ten (10) days of the receipt thereof, give written
notice of such request to all Holders and, subject to the limitations of SECTION
2(c) below, file (as expeditiously as practicable, and in any event within sixty
(60) days after the receipt of such request) and use its reasonable best efforts
to have declared effective a registration statement under the Securities Act
(which may include a "shelf" registration statement for use in connection with a
delayed or continuous offering under Rule 415 promulgated under the Securities
Act, PROVIDED that the right to require a shelf registration shall only apply to
the extent the Company is eligible to use a Form S-3 or in the event of an
Exchange Event, a Form F-3) with respect to all Registrable Securities which the
Holders request to be registered by the giving of notice to the Company within
thirty (30) days after the mailing of the Company's notice referred to above,
each such notice to be given in accordance with SECTION 19 below.

                  (b) If the Initiating Holders intend to distribute the
Registrable Securities covered by their request by means of an underwriting,
they shall so advise the Company as a part of their request made pursuant to
this SECTION 2 and the Company shall include such information in the written
notice referred to in SECTION 2(a). The Company shall select the managing
underwriter to administer the offering, subject to the prior consent of the
Initiating Holders not to be unreasonably withheld or delayed. In the event of
an underwritten offering pursuant to this SECTION 2, the right of any Holder to
include such Holder's Registrable Securities in such registration shall be
conditioned upon such Holder's participation in such underwriting and the
inclusion of such Holder's Registrable Securities in the underwriting (unless
otherwise mutually agreed by a majority in interest of the Initiating Holders
and such Holder) to the extent provided herein. All Holders proposing to
distribute their securities through such underwriting shall (together with the
Company as provided in SECTION 4(g)) enter into an underwriting agreement in
customary form with the underwriter or underwriters so selected for such
underwriting by a majority in interest of the Initiating Holders; PROVIDED,
HOWEVER, that no Holder shall be required to make any representations,
warranties or indemnities except as they relate to such Holder's ownership of
shares and authority to enter into the underwriting agreement and to such
Holder's intended method of distribution, and the liability of such Holder
(whether by indemnification, contribution or otherwise) shall be limited to an
amount equal to the net proceeds from the offering received by such Holder.
Notwithstanding any other provision of this SECTION 2, if the underwriter
advises the Initiating Holders that marketing factors require a limitation of
the number of shares to be underwritten, then the Initiating Holders shall so
advise the Company and the Company shall so advise all Holders of Registrable
Securities which would otherwise be underwritten pursuant hereto, and the number
of shares that may be included in the underwriting shall be allocated as
follows: (i) first, among the Holders of Registrable Securities that have

                                       3

<Page>

elected to participate in such underwritten offering, in proportion (as nearly
as practicable) to the amount of Registrable Securities requested by such
Holders to be included in such offering in accordance with SECTION 2(a) until
such Holders have included in the underwriting all Registrable Securities
requested by such Holders to be included, (ii) second, among any other holders
of Common Shares who have exercised any piggyback registration rights with
respect to such registration under a Prior Agreement that is superior to the
piggyback registration rights set forth in this Agreement, and (iii) thereafter
among any other holders of Common Shares who have exercised their piggyback
registration rights, if permitted hereunder, with respect to such registration.

                  (c) The Company shall be obligated to effect only four (4)
registrations pursuant to an Investor Request under this SECTION 2; PROVIDED,
HOWEVER, that the Company shall not be obligated to effect more than one (1)
registration pursuant to this SECTION 2 in any six (6) month period; and
PROVIDED, FURTHER, that the Company shall not be obligated to effect more than
one (1) registration pursuant to this SECTION 2 in any twelve (12) month period
in the case of "shelf" registrations made pursuant to an Investor Request. An
initial request for a shelf registration statement and all subsequent requests
that the Company sell Registrable Securities from such shelf registration shall
count as one Investor Request. The Company shall be obligated to cause any
registration required to be effected pursuant to this SECTION 2(c) to become and
remain effective throughout the proposed plan of distribution or for a period of
six (6) months, whichever is shorter. The Company shall not be required to pay
for any expenses of any registration proceeding begun pursuant to this SECTION 2
if the registration request is subsequently withdrawn at the request of a
majority in interest of the Initiating Holders (in which case all Initiating
Holders shall bear such expenses pro rata based upon the number of Registrable
Securities that were requested to be registered in the withdrawn registration by
the Initiating Holders); PROVIDED, HOWEVER, that if at the time of such
withdrawal, (i) the Initiating Holders have learned of a material adverse change
in the condition, business, or prospects of the Company different from that
known to the Initiating Holders at the time of their request and the Initiating
Holders have withdrawn the request with reasonable promptness following
disclosure by the Company of such material adverse change, (ii) the registration
statement relating to any such request is not declared effective within ninety
(90) days of the date such registration statement is first filed with the SEC
due to any action or inaction of the Company, (iii) if, within the earlier of
one hundred eighty (180) days after the registration relating to any such
request has become effective and the period of proposed plan of distribution,
such registration is interfered with by any stop order, injunction or other
order or requirement of the SEC or other governmental agency or court for any
reason and the Company fails to have such stop order, injunction or other order
or requirement removed, withdrawn or resolved to the Initiating Holders'
reasonable satisfaction within thirty (30) days, (iv) the conditions to closing
specified in the underwriting agreement or purchase agreement entered into in
connection with the registration relating to any such request are not satisfied
(other than as a result of a default or breach thereunder by any Initiating
Holder), (v) if more than 40% of the Registrable Securities requested by the
Initiating Holders to be included in the registration are not so included
pursuant to the cut-back provisions in Section 2(b) or (vi) if the Company
elects to defer registration under Section 2(d), then the Company shall pay all
such expenses and the Initiating Holders shall not be required to pay any of
such expenses, and the Initiating Holders shall retain their rights pursuant to
this SECTION 2 and such withdrawn request shall not count as an Investor
Request.

                                       4

<Page>

                  (d) Notwithstanding the foregoing, if the Company shall
furnish to the Initiating Holders a certificate signed by the President or Chief
Executive Officer of the Company stating that the Company has pending or in
process a material transaction (other than the filing of a registration
statement) the disclosure of which would, in the good faith judgment of the
Board of Directors of the Company, be detrimental to the Company, and that it is
therefore essential to defer the filing of such registration statement, the
Company shall have the right to defer such filing (but not the preparation) for
up to sixty (60) days after receipt of the request of the Initiating Holders;
PROVIDED, HOWEVER, that (i) the Company shall use its best efforts to complete
the transaction and file the registration statement as soon as possible, (ii)
the Company may not utilize this right for more than an aggregate of one hundred
twenty (120) days in any twelve (12) month period and (iii) after deferring the
filing of a registration statement under this Section 2(d), the Company must
wait sixty (60) days from the expiration of the aforementioned deferral period
before it may again utilize such deferral right; PROVIDED, FURTHER, that if at
the time of any Investor Request for a registration pursuant to this SECTION 2,
the Company has fixed plans (following a resolution of the Board of Directors of
the Company so authorizing) to file within sixty (60) days after such request a
registration statement covering the sale by the Company of any of its securities
in a public offering under the Securities Act, no registration shall be required
to be initiated pursuant to this SECTION 2 until one hundred twenty (120) days
after the effective date of such Company registration unless the Company is no
longer proceeding diligently to effect such registration, provided that the
Company shall provide the Holders with the right to participate in such public
offering pursuant to, and subject to, SECTION 3.

                  (e) The Company agrees not to effect any public sale or
distribution of its equity securities or securities convertible into or
exchangeable or exercisable for any of such securities within seven (7) days
prior to and ninety (90) days (or such longer period, not to exceed one hundred
eighty (180) days, which may be required by the managing underwriter, or such
shorter period as the managing underwriter may agree) after the effective date
of any registration statement filed pursuant to this SECTION 2 for an
underwritten public offering (the "TRIGGER DATE") (except (i) as part of such
registration, (ii) as permitted by any related underwriting agreement for such
registration, (iii) pursuant to an employee equity compensation plan or (iv)
pursuant to a registration on Form S-4 or S-8 or any successor form); PROVIDED
that, with respect to any shelf registration statement on Form S-3, the Trigger
Date shall be the pricing of any offering made under such registration
statement.

                  (f) Upon the request of a majority of the Initiating Holders
for the termination of a registration, the Company shall terminate such
registration and such registration shall not be considered one of the four (4)
registrations required under SECTION 2(c); PROVIDED that the Initiating Holders
shall pay the expenses of such registration in accordance with SECTION 2(c)
unless excused from doing so under the proviso set forth in SECTION 2(c).

            3. COMPANY REGISTRATION. If (but without any obligation to do so)
the Company proposes to register (including for this purpose a registration
effected by the Company for stockholders other than Holders of Registrable
Securities) any of its Common Shares under the Securities Act in connection with
the public offering of such Common Shares for cash (including, but not limited
to, a shelf registration statement on Form S-3, or in the event of an Exchange
Event, on Form F-3, but other than a registration on Form S-8 (or similar or
successor form) relating to the sale of securities to participants in a Company
stock plan or to other

                                       5

<Page>

compensatory arrangements to the extent includable on Form S-8 (or similar or
successor form), or a registration on Form S-4 (or similar or successor form),
or in the event of an Exchange Event, on Form F-4 (or similar or successor
form)), the Company shall, at such time and in any event at least twenty (20)
days prior to the first filing of the registration statement, promptly give each
Holder written notice of such registration. Upon the written request of any
Holder given within twenty (20) days after mailing of such notice by the Company
in accordance with SECTION 19, the Company shall use its best efforts to cause
to be registered under the Securities Act all of the Registrable Securities that
each such Holder has requested to be registered (unless such shares are
subsequently withdrawn from the registration by a Holder), subject to the
provisions of SECTION 8. The Company shall have no obligation under this SECTION
3 to make any offering of its securities, or to complete an offering of its
securities that it proposes to make. Notwithstanding any other provision of this
SECTION 3, if the underwriter, if any, advises the Company that marketing
factors require a limitation of the number of shares to be underwritten, then
the Company shall so advise the Holders of Registrable Securities which would
otherwise be underwritten pursuant hereto, and the number of shares that may be
included in the underwriting shall be allocated as follows: (i) first, to the
Company (including for this purpose a registration effected by the Company for
stockholders other than Holders of Registrable Securities as referenced in the
first sentence of this SECTION 3), (ii) second, among any other holders of
Common Shares who have exercised any piggyback registration rights with respect
to such registration that are superior to the piggyback registration rights set
forth in this Agreement pursuant to the Prior Agreements, and (iii) thereafter
among Holders of Registrable Securities who have exercised their piggyback
registration rights with respect to such registration.

            4. OBLIGATIONS OF THE COMPANY. Whenever required under this
Agreement to effect the registration of any Registrable Securities, the Company
shall, as expeditiously as reasonably possible:

                  (a) Prepare and file with the SEC a registration statement
with respect to such Registrable Securities, make all required filings with the
NASD and use its best efforts to cause such registration statement to become
effective promptly, and, upon the request of the Holders of a majority of the
Registrable Securities being registered thereunder, keep such registration
statement effective for up to six (6) months or until the Holders have completed
the distribution referred to in such registration statement, whichever occurs
first (but in any event for at least any period required under the Securities
Act); PROVIDED that before filing such registration statement or any amendments
thereto, the Company will furnish to the Holders copies of all such registration
statements or amendments thereto proposed to be filed.

                  (b) Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement.

                  (c) Furnish copies of all documents proposed to be filed with
the SEC in connection with such registration to (i) one counsel selected by the
Initiating Holders in the case of a registration pursuant to SECTION 2 or
SECTION 3 where there are Initiating Holders or (ii) in the case of a
registration pursuant to SECTION 3 where there are no Initiating Holders, one
counsel selected by a majority in interest of the Holders selling Registrable
Securities, and give such

                                       6

<Page>

counsel to the Holders of such Registrable Securities so to be registered the
opportunity to participate in the preparation of any registration statement,
amendment, post-effective amendment, supplement to such registration statement
or the prospectus used in connection therewith and access to the financial and
other records, pertinent corporate documents and properties of the Company and
its subsidiaries and opportunities to discuss the business of the Company with
its officers and the independent public accountants who have issued audit
reports on its financial statements in each case as shall be reasonably
requested by such counsel in connection with such registration statement, and
all documents proposed to be filed with the SEC in connection with such
registration shall be subject to the review of such counsel, and the Company
shall not file any registration statement or any amendment or post-effective
amendment or supplement to such registration statement or the prospectus used in
connection therewith to which such counsel shall have reasonably objected on the
grounds that such registration statement, amendment, supplement or prospectus
does not comply (explaining why) in all material respects with the requirements
of the Securities Act or of the rules or regulations thereunder.

                  (d) Furnish to the Holders selling Registrable Securities,
without charge, such number of copies of such registration statement and of each
amendment and supplement thereto (including all exhibits and documents filed
therewith), such number of copies of the prospectus contained in such
registration statement (including each preliminary prospectus and any summary
prospectus) and any other prospectus filed under Rule 424 under the Securities
Act, in conformity with the requirements of the Securities Act, and such other
documents as any of the Holders may reasonably request in order to facilitate
the disposition of Registrable Securities owned by them.

                  (e) Use its best efforts to register and qualify the
securities covered by such registration statement under such other securities or
"blue sky" laws of such states or jurisdictions as shall be reasonably requested
by the Holders, provided that the Company shall not be required in connection
therewith or as a condition thereto (i) to qualify to do business in any state
or jurisdiction where it would not otherwise be required to qualify but for the
requirements of this SECTION 4(e), or (ii) to file a general consent to service
of process in any such state or jurisdiction.

                  (f) Use its best efforts to cause all Registrable Securities
covered by such registration statement to be registered with or approved by such
other governmental agencies, authorities or self-regulatory bodies as may be
necessary by virtue of the business and operations of the Company to enable the
seller or sellers thereof to consummate the disposition of such Registrable
Securities in accordance with the intended method or methods of disposition
thereof.

                  (g) In the event of any underwritten public offering, enter
into and perform its obligations under an underwriting agreement, in usual and
customary form, with the managing underwriter of such offering, and take such
actions as the Holders of Registrable Securities covered by such registration
statement reasonably request in order to expedite or facilitate the disposition
of such Registrable Securities, including, without limitation, preparing for,
and participating in, such number of "road shows" and all such other customary
selling efforts as the underwriters reasonably request in order to expedite or
facilitate such disposition.

                                       7

<Page>

                  (h) Notify each Holder of Registrable Securities covered by
such registration statement at any time when a prospectus relating thereto is
required to be delivered under the Securities Act of the happening of any event
as a result of which the prospectus included in such registration statement, as
then in effect, includes an untrue statement of a material fact or omits to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which such statements
were made, not misleading and, as promptly as is practicable, prepare and
furnish to such Holder a reasonable number of copies of a supplement to or an
amendment of such prospectus as may be necessary so that, as thereafter
delivered to the purchasers of such securities, such prospectus shall not
include an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading in light of the circumstances then existing.

                  (i) Notify each Holder of Registrable Securities covered by
such registration statement and such Holder's underwriters, if any, and confirm
such advice in writing: (i) of any pre-effective amendment and when the
registration statement has become effective, (ii) when any post-effective
amendment to the registration statement becomes effective and (iii) of any
request by the SEC for any amendment or supplement to the registration statement
or prospectus or for additional information.

                  (j) Notify each Holder of Registrable Securities if at any
time the SEC should institute or threaten to institute any proceedings for the
purpose of issuing, or should issue, a stop order suspending the effectiveness
of the registration statement. Upon the occurrence of any of the events
mentioned in the preceding sentence, the Company will use its reasonable best
efforts to prevent the issuance of any such stop order or to obtain the
withdrawal thereof at the earliest possible moment. The Company will advise each
Holder of Registrable Securities promptly of any order or communication of any
public or regulatory board or body addressed to the Company suspending or
threatening to suspend the qualification of any Registrable Securities for sale
in any jurisdiction.

                  (k) In the case of an offering that is an underwritten public
offering or offering by any person who controls the Company within the meaning
of the Securities Act, cause to be delivered an opinion of the counsel
representing the Company for the purposes of such registration, dated the
effective date of such registration statement and in form and substance as is
customarily given to underwriters in an underwritten public offering, to be
addressed and delivered to the Holders of Registrable Securities covered by such
registration statement and the underwriters (if any) (and, if such registration
includes an underwritten public offering, the date of the closing under the
underwriting agreement).

                  (l) In the case of an offering that is an underwritten public
offering or offering by any person who controls the Company within the meaning
of the Securities Act, cause to be delivered a "comfort" letter, dated the
effective date of such registration statement and in form and substance as is
customarily given by independent certified public accountants to the
underwriters in an underwritten public offering (unless the registration is
pursuant to SECTION 3 and such a letter is not otherwise being furnished to the
Company) to be addressed and delivered to the Holders of Registrable Securities
covered by such registration statement and the

                                       8

<Page>

underwriters and cause a reaffirmation of such letter to be addressed and
delivered to them on the date that such Registrable Securities are delivered to
the underwriters for sale.

                  (m) As soon as practicable after the effective date of such
registration statement, have "made generally available to its security holders"
(within the meaning of Rule 158 under the Securities Act) an earnings statement
covering a period of at least twelve (12) months beginning after the effective
date of such registration statement and otherwise complying with Section 11(a)
of the Securities Act.

                  (n) List the Registrable Securities which are registered
pursuant to SECTION 2 or SECTION 3 on each national securities exchange or
automated quotation system upon which the shares to be registered are traded.

                  (o) Make reasonably available for inspection by any Holder,
any underwriter participating in any disposition pursuant to such registration
statement and any attorney, accountant or other agent retained by any such
Holder or underwriter, all financial and other records, pertinent corporate
documents and properties of the Company, and cause the officers, directors,
employees and independent accountants of the Company to supply all information
reasonably requested by any such Holder, underwriter, attorney, accountant or
agent in connection with such registration statement, in each case only to the
extent necessary to permit the holders to conduct a reasonable investigation
within the meaning of the Securities Act (taking into account any other
information regarding the Company that any such Holder may already have in its
possession). To minimize disruption and expense to the Company during the course
of the registration process, the holders and any transferee(s) of the Holders
shall, to the extent practicable, coordinate investigation and due diligence
efforts hereunder and will enter into confidentiality agreements with the
Company in form and substance reasonably satisfactory to the Company and the
Holders of the Registrable Securities prior to the disclosure of any
confidential or proprietary information of the Company.

                  (p) Use its best efforts to take all other steps necessary to
effect the registration of the Registrable Securities contemplated hereby.

            5. AMENDMENTS, SUPPLEMENTS TO PROSPECTUS. Immediately upon receipt
of a notice referred to in SECTION 4(h) hereof, each Holder agrees to (i) cease
making sales of securities pursuant to any then effective registration statement
or any prospectus contained therein until it has received from the Company an
amendment or supplement to the registration statement or prospectus and (ii) if
so directed by the Company, to promptly deliver to the Company (at the Company's
expense) any copies, other than permanent file copies, of the registration
statement or such prospectus then in its possession. In the event that the
Company shall give any such notice, the period mentioned in SECTION 2(c) and
SECTION 4(a) shall be extended by the number of days during the period from and
including the date of the giving of such notice to and including the date when
each Holder of any Registrable Securities covered by such registration statement
shall have received the copies of the supplemented or amended prospectus
contemplated by SECTION 4(h).

            6. FURNISH INFORMATION. It shall be a condition precedent to the
obligations of the Company to take any action pursuant to this Agreement with
respect to the Registrable Securities

                                       9

<Page>

of any selling Holder that such Holder shall promptly furnish to the Company
such information regarding itself, the Registrable Securities held by it, and
the intended method of disposition of such securities as shall be required to
effect the registration of such Holder's Registrable Securities.

            7. EXPENSES OF REGISTRATION. All expenses, other than underwriting
discounts and commissions incurred in connection with registrations, filings or
qualifications pursuant to SECTIONS 2 AND 3, including (without limitation) all
registration, filing and qualification fees, NASD fees, fees and expenses of
complying with securities or blue sky laws, fees and expenses associated with
listing securities on an exchange or NASDAQ, word processing, duplicating and
printing fees, messenger and delivery expenses, transfer agents', trustees',
depositories', registrars' and fiscal agents' fees, fees and expenses of counsel
and accountants for the Company, including the expenses of any special audits or
"cold comfort" letters, reasonable fees and disbursements of one firm of counsel
for all of the selling Holders under this Agreement (it being agreed that in the
case of a registration under Section 3 where there are no Initiating Holders,
counsel will be selected by any holder of securities exercising demand
registration rights in connection with such registration, if applicable, or by a
majority in interest of the holders including securities in such offering) shall
be borne by the Company, even if such registrations, filings or qualifications
do not become effective, subject to SECTION 2(c).

            8. UNDERWRITING REQUIREMENTS. In connection with any underwritten
offering initiated by the Company or any stockholder other than a Holder of
Registrable Securities, the Company shall not be required under SECTION 3 to
include any Holder's securities in such underwriting unless such Holder accepts
the terms of the underwriting as agreed upon between the Company or such
stockholder and the underwriters selected by the Company or such stockholder;
PROVIDED, HOWEVER, that no Holder participating in such underwriting shall be
required to make any representations, warranties or indemnities except as they
relate to such Holder's ownership of Registrable Securities and authority to
enter into the underwriting agreement and to such Holder's intended method of
distribution, and the liability of such Holder (whether by indemnification,
contribution or otherwise) shall be limited to an amount equal to the net
proceeds from the offering received by such Holder. If a Holder complies with
the requirements set forth in this SECTION 8, then such Holder shall have the
right to be included in any underwritten offering by the Company, whether
initiated by the Company or any stockholder, subject to the terms of SECTION 3
and to the limitations set forth below in this SECTION 8.

            9. INDEMNIFICATION. In the event any Registrable Securities are
included in a registration statement under this Agreement:

                  (a) The Company will indemnify and hold harmless each Holder,
its heirs, personal representatives and assigns, each of such Holder's officers,
directors, partners, employees and affiliates, any underwriter (as defined in
the Securities Act) for such Holder and each Person, if any, who controls such
Holder or underwriter within the meaning of the Securities Act or the Exchange
Act against any losses, claims, damages or liabilities (or actions or
proceedings in respect thereof), jointly or severally, directly or
indirectly, to which they may become subject under the Securities Act, the
Exchange Act or other federal, state, Canadian federal, provincial or
territorial securities law, insofar as such losses, claims, damages or

                                       10

<Page>

liabilities (or actions or proceedings in respect thereof) arise out
of or are based upon a Violation; and the Company will pay to each such
indemnified party, as incurred, any legal or other expenses reasonably incurred
by it in connection with such registration or investigating, preparing, pursuing
or defending any such loss, claim, damage, liability, action or proceeding;
PROVIDED, HOWEVER, that the indemnity agreement contained in this SECTION 9(a)
shall not apply to amounts paid in settlement of any such loss, claim, damage,
liability, action or proceeding if such settlement is effected without the
consent of the Company (which consent shall not be unreasonably withheld or
delayed), nor shall the Company be liable in any such case to a particular
indemnified party for any such loss, claim, damage, liability, action or
proceeding to the extent that it arises out of or is based upon a Violation
which occurs in reliance upon and in conformity with written information
furnished expressly for use in connection with such registration by such
indemnified party. The indemnity agreement contained in this SECTION 9(a) with
respect to the Registrable Securities of any indemnified party shall survive the
transfer of Registrable Securities by such indemnified party.

                  (b) Each selling Holder will indemnify and hold harmless the
Company, each of its directors, each of its officers and employees, each Person,
if any, who controls the Company within the meaning of the Securities Act, any
underwriter, any other Holder (and any affiliate thereof) selling securities in
such registration statement and any controlling Person of any such underwriter
or other Holder, against any losses, claims, damages or liabilities (or actions
or proceedings in respect thereof), jointly or severally, directly or
indirectly, to which any of the foregoing Persons may become subject, under the
Securities Act, the Exchange Act or other federal, state, Canadian federal,
provincial or territorial securities law, insofar as such losses, claims,
damages or liabilities (or actions or proceedings in respect thereof) arise out
of or are based upon any Violation, in each case to the extent (and only to the
extent) that such Violation occurs in reliance upon and in conformity with
written information furnished by such Holder expressly for use in connection
with such registration (it being understood that such information shall only
consist of the information relating to such holder under Section 2(b)); and each
such Holder will pay, as incurred, any legal or other expenses reasonably
incurred by any Person expressly indemnified pursuant to this SECTION 9(b) in
connection with investigating, preparing, pursuing or defending any such loss,
claim, damage, liability, action or proceeding; PROVIDED, HOWEVER, that the
indemnity agreement contained in this SECTION 9(b) shall not apply to amounts
paid in settlement of any such loss, claim, damage, liability, action or
proceeding if such settlement is effected without the consent of the Holder
(which consent shall not be unreasonably withheld or delayed); PROVIDED,
FURTHER, that in no event shall the liability of any Holder under this SECTION
9(b) or otherwise in connection with such registration exceed the net proceeds
from the registration received by such Holder.

                  (c) Promptly after receipt by an indemnified party under this
SECTION 9 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this SECTION 9, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; PROVIDED, HOWEVER, that an indemnified party shall
have the right to retain its own counsel (but no more than one separate counsel,
plus any required local counsel, with respect to all indemnified parties) with
the

                                       11

<Page>

fees and expenses to be paid by the indemnifying party, if in the reasonable
opinion of counsel to an indemnified party, representation of such indemnified
party by the counsel retained by the indemnifying party would be inappropriate
due to actual or potential conflicts of interests between, or different defenses
available to, such indemnified party and any other party represented by such
counsel in such proceeding. The failure to deliver written notice to the
indemnifying party within a reasonable time of the commencement of any such
action shall not relieve such indemnifying party of any liability to the
indemnified party under this SECTION 9 except if, and only to the extent that,
the indemnifying party is actually prejudiced thereby.

                  (d) The obligations of the Company and Holders under this
SECTION 9 shall survive the completion of any offering of Registrable Securities
in a registration statement under this Agreement.

                  (e) Any indemnity agreements contained herein shall be in
addition to any other rights to indemnification or contribution which any
indemnified party may have pursuant to law or contract and shall remain
operative and in full force and effect regardless of any investigation made or
omitted by or on behalf of any indemnified party.

                  (f) If for any reason the foregoing indemnity is unavailable,
then the indemnifying party shall contribute to the amount paid or payable by
the indemnified party as a result of such losses, claims, damages, liabilities,
actions, proceedings or expenses (i) in such proportion as is appropriate to
reflect the relative benefits received by the indemnifying party on the one hand
and the indemnified party on the other or (ii) if the allocation provided by
clause (i) above is not permitted by applicable law or provides a lesser sum to
the indemnified party than the amount hereinafter calculated, then, in lieu of
indemnifying such indemnified party, the indemnifying party shall contribute to
the amount paid or payable by the indemnified party as a result of such losses,
claims, damages, liabilities, actions, proceedings or expenses in such
proportion as is appropriate to reflect not only the relative benefits received
by the indemnifying party on the one hand and the indemnified party on the other
but also the relative fault of the indemnifying party and the indemnified party
as well as any other relevant equitable considerations in connection with the
offering of Registrable Securities. The relative fault shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged omission to state a material fact
relates to information supplied by or on behalf of the indemnifying party or the
indemnified party and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such untrue statement or
omission. No Person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any Person who was not guilty of such fraudulent misrepresentation.
Notwithstanding anything to the contrary in this SECTION 9, no Holder shall be
required, pursuant to this SECTION 9 or otherwise in connection with the
offering of Registrable Securities, to contribute any amount in excess of (a)
the net proceeds received by such indemnifying party from the sale of its
Registrable Securities in the offering to which the losses, claims, damages,
liabilities, actions, proceedings or expenses of the indemnified party relate
minus (b) any amounts previously paid by such indemnifying party pursuant to
this SECTION 9 in respect of such claim. No party shall be liable for
contribution under this SECTION 9(f) except to the extent and under such
circumstances as such party would have been liable for indemnification under
this SECTION 9 if such indemnification were enforceable under applicable law.

                                       12

<Page>

            10. REPORTS UNDER THE EXCHANGE ACT. With a view to making available
to the Holders the benefits of Rule 144 under the Securities Act and any other
rule or regulation of the SEC that may at any time permit a Holder to sell
securities of the Company to the public without registration, the Company agrees
to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144 under the Securities Act;

                  (b) remain registered under the Exchange Act and file with the
SEC in a timely manner all reports and other documents required of the Company
under the Securities Act and the Exchange Act; and

                  (c) furnish to any Holder, so long as the Holder owns any
Registrable Securities, forthwith upon request (i) a written statement by the
Company that it has complied with the reporting requirements of Rule 144 under
the Securities Act, (ii) a copy of the most recent annual or quarterly report of
the Company and such other reports and documents so filed by the Company, and
(iii) such other information as may be reasonably requested in availing any
Holder of any rule or regulation of the SEC which permits the selling of any
such securities without registration.

            11. ASSIGNMENT OF REGISTRATION RIGHTS. The rights to cause the
Company to register Registrable Securities pursuant to this Agreement may be
assigned in whole or in part to any Person acquiring Registrable Securities from
a Holder in compliance with the applicable provisions of any relevant agreement
between such Holder and the Company, PROVIDED that such transferee or assignee
delivers to the Company a written instrument by which such transferee or
assignee agrees to be bound by the obligations imposed on Holders under this
Agreement to the same extent as if such transferee or assignee were a party
hereto.

            12. ASSIGNMENT TO CERI. If an Exchange Event occurs, then the rights
and obligations of the Company under this Agreement will be automatically
assigned to and assumed by CERI, with no further action required on the part of
the Company or CERI. Upon the assignment of the Company's rights to CERI
pursuant to this SECTION 12, CERI shall become the "Company" for purposes of
this Agreement and the defined term "Common Shares" as used herein shall be
deemed to refer to common shares in the capital of CERI, and all other terms of
this Agreement shall remain in full force and effect.

            13. AMENDMENT; WAIVER. Any provision of this Agreement may be
amended only with the written consent of the Company and Holders holding a
majority of the Registrable Securities. The observance of any provision of this
Agreement may be waived (either generally or in a particular instance and either
retroactively or prospectively) only with the written consent of Holders holding
a majority of the Registrable Securities. Any amendment or waiver effected in
accordance with this SECTION 13 shall be binding upon each Holder of Registrable
Securities at the time outstanding, each future Holder of all such securities,
and the Company.

            14. CHANGES IN REGISTRABLE SECURITIES. If, and as often as, there
are any changes in the Registrable Securities by way of stock split, stock
dividend, combination or reclassification, or through merger, consolidation,
reorganization or recapitalization, or by any other means,

                                       13

<Page>

appropriate adjustment shall be made in the provisions of this Agreement, as may
be required, so that the rights and privileges granted hereby shall continue
with respect to the Registrable Securities as so changed. Without limiting the
generality of the foregoing, the Company will require any successor by merger or
consolidation or reorganization to assume and agree to be bound by the terms of
this Agreement, as a condition to any such merger or consolidation.

            15. OTHER AGREEMENTS; PRIORITY. The piggyback registration rights
granted hereunder pursuant to SECTION 3 shall, to the extent referred to
therein, be subordinate in right to the piggyback registration rights set forth
in the Prior Agreements. The rights granted to the Holders hereunder shall not
be subordinate to any registration rights granted by the Company or CERI (past
or future) except as provided in the immediately preceding sentence.

            16. ENTIRE AGREEMENT. This Agreement constitutes the full and entire
understanding and agreement among the parties with regard to the subject matter
hereof. Nothing in this Agreement, express or implied, is intended to confer
upon any Person, other than the parties hereto and their respective successors
and assigns, any rights, remedies, obligations, or liabilities under or by
reason of this Agreement, except as expressly provided herein.

            17. GOVERNING LAW. This Agreement and the rights and obligations of
the parties hereunder and the Persons subject hereto shall be governed by, and
construed and interpreted in accordance with, the law of the State of New York,
without giving effect to the choice of law principles thereof.

            18. SUCCESSORS AND ASSIGNS. The provisions hereof shall inure to the
benefit of, and be binding upon, the successors, permitted assigns (as provided
in SECTION 11), required assigns (as provided in SECTION 12), heirs, executors
and administrators of the parties hereto.

            19. NOTICES. Unless otherwise provided, any notice required or
permitted under this Agreement shall be given in writing and shall be deemed
effectively given upon receipt by the party to be notified (including by
telecopier, receipt confirmed) or three (3) days after being sent by registered
or certified mail, postage prepaid and addressed to the party to be notified (a)
if to a party other than the Company, at such party's address set forth at the
end of this Agreement or at such other address as such party shall have
furnished to the Company in writing, or (b) if to the Company, at its address
set forth at the end of this Agreement, or at such other address as the Company
shall have furnished to the parties in writing.

            20. SEVERABILITY. Any invalidity, illegality or limitation on the
enforceability of this Agreement or any part hereof, by any party whether
arising by reason of the law of the respective party's domicile or otherwise,
shall in no way affect or impair the validity, legality or enforceability of
this Agreement with respect to other parties. If any provision of this Agreement
shall be judicially determined to be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby.

            21. TITLES AND SUB-TITLES. The titles and sub-titles of the Sections
of this Agreement are for convenience of reference only and are not to be
considered in construing this Agreement.

                                       14

<Page>

            22. DELAYS OR OMISSIONS; REMEDIES CUMULATIVE. It is agreed that no
delay or omission to exercise any right, power or remedy accruing to the
parties, upon any breach or default of another party under this Agreement, shall
impair any such right, power or remedy, nor shall it be construed to be a waiver
of any such breach or default, or any acquiescence therein, or of any similar
breach or default thereafter occurring; nor shall any waiver of any single
breach or default be deemed a waiver of any other breach or default theretofore
or thereafter occurring. It is further agreed that any waiver, permit, consent
or approval of any kind or character by a party of any breach or default under
this Agreement, or any waiver by a party of any provisions or conditions of this
Agreement must be in writing and shall be effective only to the extent
specifically set forth in writing and that all remedies, either under this
Agreement, or by law or otherwise afforded to a party, shall be cumulative and
not alternative.

            23. COUNTERPARTS. This Agreement may be executed in any number of
counterparts (including by facsimile), each of which shall be deemed an
original, but all of which together shall constitute one instrument.

            24. TERM. This Agreement shall be effective as of the date hereof
and shall continue in effect thereafter until the earlier of (a) its termination
by the consent of the parties hereto or their respective successors in interest
and (b) the date on which no Registrable Securities remain outstanding, subject
to the continued effectiveness of the rights and obligations under Section 9.

                                       15

<Page>

      IN WITNESS WHEREOF, the undersigned have executed this Registration Rights
Agreement as of the date first above written.

                             WASTE SERVICES, INC.

                             By:  /s/ Thomas E. Durkin
                                 ---------------------------------------------
                                 Name:  Thomas E. Durkin III
                                 Title: Secretary

                             c/o Capital Environmental Resource Inc.
                             1005 Skyview Drive
                             Burlington, Ontario L7P 5B1
                             Attention: Thomas E. Durkin, III
                             Facsimile: (905) 319-9050

                             CAPITAL ENVIRONMENTAL RESOURCE INC.

                             By:  /s/ Thomas E. Durkin
                                 ---------------------------------------------
                                 Name:  Thomas E. Durkin III
                                 Title: Secretary

                             1005 Skyview Drive
                             Burlington, Ontario L7P 5B1
                             Attention: Thomas E. Durkin, III
                             Facsimile: (905) 319-9050

                             INVESTORS:

                             KELSO INVESTMENT ASSOCIATES VI, L.P.

                             By:  Kelso GP VI, LLC,
                                  its general partner

                             By:  /s/ George E. Matelich
                                 ---------------------------------------------
                                 Managing Member

                             c/o Kelso & Company
                             320 Park Avenue, 24th Floor
                             New York, NY  10022
                             Facsimile:  (212) 223-2379
                             Attention:  James J. Connors, II, Esq.

<Page>

                             KEP VI, LLC

                             By: /s/ George E. Matelich
                                --------------------------------------
                                 Managing Member

                             c/o Kelso & Company
                             320 Park Avenue, 24th Floor
                             New York, NY  10022
                             Facsimile:  (212) 223-2379
                             Attention:  James J. Connors, II, Esq.

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