UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549
                                  SCHEDULE l3D
                    Under the Securities Exchange Act of 1934


                               CLEAN HARBORS, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    184496107
--------------------------------------------------------------------------------
                                 (CUSIP Number)
                                                     with a copy to:
     Stephen Feinberg                                Robert G. Minion, Esq.
     450 Park Avenue                                 Lowenstein Sandler PC
     28th Floor                                      65 Livingston Avenue
     New York, New York  10022                       Roseland, New Jersey  07068
     (212) 421-2600                                  (973) 597-2424
--------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                               September 10, 2002
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of Sections 240.13d-1(e),  240.13d-1(f) or 240.13d-1(g),  check
the following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule,  including all exhibits. See Section 240.13d-7 for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





Cusip No.    184496107
--------------------------------------------------------------------------------
  1)   Names of Reporting Persons.  I.R.S. Identification Nos. of  above persons
       (entities only):

                                Stephen Feinberg
--------------------------------------------------------------------------------
  2)   Check the Appropriate Box if a Member of a Group (See Instructions):
             (a)                    Not
             (b)                 Applicable
--------------------------------------------------------------------------------
  3)   SEC Use Only
--------------------------------------------------------------------------------
  4)   Source of Funds (See Instructions):  WC
--------------------------------------------------------------------------------
  5)   Check if  Disclosure of  Legal Proceedings is  Required Pursuant to Items
       2(d) or 2(e):         Not Applicable
--------------------------------------------------------------------------------
  6)   Citizenship or Place of Organization:    United States
--------------------------------------------------------------------------------
        Number of                        7) Sole Voting Power:            *
                                            ------------------------------------
        Shares Beneficially              8) Shared Voting Power:          *
                                            ------------------------------------
        Owned by
        Each Reporting                   9) Sole Dispositive Power:       *
                                            ------------------------------------
        Person With                     10) Shared Dispositive Power:     *
                                            ------------------------------------
--------------------------------------------------------------------------------
  11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
                   1,595,238*
--------------------------------------------------------------------------------
  12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares  (See
       Instructions):      Not Applicable
--------------------------------------------------------------------------------
  13)  Percent of Class Represented by Amount in Row (11):     11.6%*
--------------------------------------------------------------------------------
  14)  Type of Reporting Person (See Instructions):       IA, IN
--------------------------------------------------------------------------------

*  Cerberus CH LLC, a Delaware limited liability company ("Cerberus CH"), is the
holder of 16,750 shares of Series C Convertible Preferred Stock, par value $0.01
per share (the  "Preferred  Shares"),  of Clean Harbors,  Inc., a  Massachusetts
corporation  (the  "Company").  Subject to certain  restrictions,  the Preferred
Shares  are  convertible  at any time on or after the date of  issuance  of such
shares into shares of common stock, par value $0.01 per share (the "Shares"), of
the Company.  The conversion  price of the Preferred Shares is $10.50 per share,
subject to certain conversion price adjustments. Stephen Feinberg possesses sole
power to vote and direct the  disposition of all securities held by Cerberus CH.
Thus,  as of September 10, 2002,  for the  purposes of Reg.  Section  240.13d-3,
Stephen Feinberg is deemed to beneficially own 1,595,238 Shares, or 11.6% of the
Shares deemed issued and outstanding as of that date.




Item 1.    Security and Issuer.
           -------------------

           The class of equity securities  to which this Schedule 13D relates is
the common stock,  par value $0.01 per share (the  "Shares"),  of Clean Harbors,
Inc., a  Massachusetts  corporation  (the  "Company").  The principal  executive
offices  of the  Company  are  located  at 1501  Washington  Street,  Braintree,
Massachusetts  02184.


Item 2.    Identity and Background.
           -----------------------

           The person filing this statement is Stephen Feinberg,  whose business
address is 450 Park Avenue,  28th Floor,  New York, New York 10022. Mr. Feinberg
serves as the  managing  member of  Cerberus  Associates,  L.L.C.,  which is the
general  partner of Cerberus  Partners,  L.P.,  which is the managing  member of
Cerberus CH LLC, a Delaware limited liability company ("Cerberus CH").  Cerberus
CH is engaged in the investment in personal property of all kinds, including but
not limited to capital stock, depository receipts,  investment companies, mutual
funds,  subscriptions,  warrants,  bonds, notes,  debentures,  options and other
securities of whatever kind and nature.  Mr.  Feinberg also provides  investment
management and other services for various other third parties.

           Mr. Feinberg  has never been  convicted  in any  criminal  proceeding
(excluding traffic violations or similar misdemeanors),  nor has he been a party
to any civil proceeding  commenced before a judicial or  administrative  body of
competent  jurisdiction  as a  result  of which  he was or is now  subject  to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws. Mr. Feinberg is a citizen of the United
States.


Item 3.    Source and Amount of Funds or Other Consideration.
           -------------------------------------------------

           Pursuant to a Securities Purchase Agreement, dated as of September 6,
2002, by and among the Company,  Cerberus CH and certain  other parties  thereto
(the "Purchase  Agreement"), on September 10, 2002, Cerberus CH purchased 16,750
shares of Series C Convertible  Preferred  Stock, par value $0.01 per share (the
"Preferred  Shares"),  of the Company,  at a purchase price of $1,000 per share.
Subject to certain  restrictions,  the Preferred  Shares are  convertible at any
time on or after the date of issuance thereof into Shares.  The conversion price
of the Preferred Shares is $10.50 per share, subject to certain conversion price
adjustments. All funds used to purchase or acquire the securities of the Company
by Cerberus CH came directly from the assets of Cerberus CH.


Item 4.    Purpose of Transaction.
           ----------------------

           The  acquisition  of  the  securities  referred  to  herein   is  for
investment  purposes.  Mr.  Feinberg has no present  plans or  intentions  which
relate to or would result in any of the transactions required to be described in
Item 4 of Schedule 13D.




Item 5.    Interest in Securities of the Issuer.
           ------------------------------------

           Based upon information provided by the Company, there were 12,164,312
Shares issued and  outstanding  as of August 31, 2002. As of September 10, 2002,
Cerberus  CH is the  holder of  16,750  Preferred  Shares.  Subject  to  certain
restrictions,  the Preferred  Shares are convertible at any time on or after the
date of  issuance  of such  shares  into  Shares.  The  conversion  price of the
Preferred  Shares is $10.50 per  share,  subject  to  certain  conversion  price
adjustments.  Stephen  Feinberg  possesses  sole  power to vote and  direct  the
disposition of all  securities  held by Cerberus CH.  Thus,  as of September 10,
2002, for the purposes of Reg. Section 240.13d-3,  Stephen Feinberg is deemed to
beneficially  own  1,595,238  Shares,  or 11.6% of the Shares  deemed issued and
outstanding as of that date.

           During  the  sixty  days  prior  to   September 10,  2002,  the  only
transaction  in Shares,  or  securities  convertible  into,  exercisable  for or
exchangeable for Shares,  by Mr. Feinberg or any person or entity  controlled by
him or any person or entity for which he possesses voting or investment  control
over the  securities  thereof,  was the  September 10, 2002  purchase  of 16,750
Preferred  Shares  pursuant to the  Purchase  Agreement  at a purchase  price of
$1,000 per Preferred Share, as described in this Schedule 13D.


Item 6.    Contracts, Arrangements, Understandings or Relationships With Respect
           to Securities of the Issuer.
           ---------------------------------------------------------------------

           In connection with the purchase of the Preferred  Shares, in addition
to the  Purchase  Agreement  which is attached as Exhibit 1 hereto,  Cerberus CH
entered  into (i) an  Investors  Rights  Agreement,  dated  September  6,  2002,
pursuant to which,  among other  things,  the  Company,  Cerberus CH and certain
other  parties  agreed to the terms  pursuant  to which  (a) the  Company  shall
register the shares of the Company  issuable  upon  conversion  of the Preferred
Shares for resale by the filing of a registration  statement with the Securities
and Exchange  Commission  pursuant to the Securities Act of 1933, as amended, as
well as  perform  various  other  obligations  and  agreements  related  to such
registration  and (b) Cerberus CH and certain other parties were granted co-sale
rights with respect to certain  sales of Shares by one or more  shareholders  of
the Company,  as more  particularly  set forth and  described  in the  Investors
Rights Agreement  attached as Exhibit 2 hereto,  (ii) a Voting Agreement,  dated
September 6, 2002, pursuant to which, among other things,  certain  shareholders
of the Company (a) agreed to vote in favor of certain  matters brought to a vote
of the shareholders of the Company with respect to the transactions contemplated
by the Purchase  Agreement,  (b) granted a proxy to certain  persons  (including
persons  affiliated  with and/or  employed by Cerberus CH or its  affiliates) to
vote their Shares with respect to certain matters  involving the Company and (c)
agreed to refrain from transferring  their Shares unless certain  conditions are
satisfied,  as more particularly set forth and described in the Voting Agreement
attached as Exhibit 3 hereto and (iii) a Letter  Agreement,  dated  September 6,
2002, pursuant to which, among other things, Cerberus Capital Management,  L.P.,
on behalf of Cerberus CH, agreed with Oak Hill  Advisors,  Inc. that Cerberus CH
and Oak Hill  Advisors,  Inc.  will  preserve  certain  specified  rights of the
holders  of  the  Preferred  Shares  with  respect  to  the  Company,   as  more
particularly set forth and described in the Letter Agreement attached as Exhibit
4 hereto.





           In addition,  pursuant to the Purchase  Agreement,  the  Company  has
agreed,  among other things, to (i) use its best efforts to solicit proxies from
the shareholders of the Company to vote in favor of the approval of the issuance
of Shares in  connection  with the  transactions  contemplated  by the  Purchase
Agreement  greater  in the  aggregate  than  19.99%  of  the  number  of  Shares
outstanding  prior to the consummation of the  transactions  contemplated by the
Purchase  Agreement  and (ii)  cause the board of  directors  of the  Company to
recommend to the stockholders that they approve such proposal.

           The descriptions of the transactions and agreements set forth in this
Schedule  13D are  qualified  in their  entirety by  reference  to the  complete
agreements  governing such matters,  each of which are attached to this Schedule
13D as exhibits pursuant to Item 7 hereof.

           Except as otherwise  described  herein,  no contracts,  arrangements,
understandings or similar  relationships exist with respect to the securities of
the Company between Stephen Feinberg and any person or entity.


Item 7.    Material to be Filed as Exhibits.
           --------------------------------

           1.   Securities Purchase Agreement, dated as of September 6, 2002, by
and among the Company, Cerberus CH and certain other parties identified therein.

           2.   Investors Rights Agreement,  dated as of  September 6, 2002,  by
and among the Company, Cerberus CH and certain other parties identified therein.

           3.  Voting Agreement, dated as of September 6, 2002, by and among the
Company, Cerberus CH and certain other parties identified therein.

           4.   Letter  Agreement,  dated  September 6,  2002,  by  and  between
Cerberus  Capital  Management, L.P.,  on  behalf of  Cerberus CH,  and  Oak Hill
Advisors, Inc.






                                    Signature

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


                                         September 12, 2002


                                         /s/ Stephen Feinberg
                                         ---------------------------------------
                                         Stephen Feinberg, in  his capacity
                                         as the managing member of Cerberus
                                         Associates,  L.L.C.,  the  general
                                         partner of Cerberus Partners, L.P.,
                                         the managing member of Cerberus CH LLC.



      Attention: Intentional misstatements or omissions of fact constitute
                Federal criminal violations (See 18 U.S.C. 1001).





                                                                  Execution Copy



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





                          SECURITIES PURCHASE AGREEMENT




                                      among




                               CLEAN HARBORS, INC.




                                       and




                     THE BUYERS LISTED ON SCHEDULE A HERETO




                                September 6, 2002





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






                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

1.  PURCHASE AND SALE OF PREFERRED SHARES.....................................2

2.  BUYER'S REPRESENTATIONS AND WARRANTIES....................................2

3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.............................4

4.  COVENANTS................................................................29

5.  TRANSFER AGENT INSTRUCTIONS..............................................31

6.  CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL...........................32

7.  CONDITIONS TO EACH BUYER'S OBLIGATION TO PURCHASE........................33

8.  INDEMNIFICATION..........................................................36

9.  MISCELLANEOUS............................................................37










                                    EXHIBITS

Exhibit A      -    Form of Certificate
Exhibit B      -    Form of Investors Rights Agreement
Exhibit C      -    Form of Voting Agreement
Exhibit D           Irrevocable Transfer Agent Instructions
Exhibit E           Sale Order
Exhibit F      -    Form of Company Counsel Opinion






                                      INDEX

                                                                            Page

19.99% Rule....................................................................5
1933 Act.......................................................................1
1934 Act.......................................................................8
Agreement......................................................................1
Articles of Organization.......................................................6
Bankruptcy Code...............................................................28
Business Day...................................................................2
Business Intellectual Property................................................19
Business Trade Secrets........................................................19
Buyers.........................................................................1
By-laws........................................................................6
CAA...........................................................................23
Capital Stock..................................................................6
CERCLA........................................................................23
Certificate....................................................................1
Closing........................................................................2
Closing Date...................................................................2
Code..........................................................................14
Common Stock...................................................................1
Company........................................................................1
Company Financial Statements...................................................8
Congress......................................................................34
Congress Loan Documents.......................................................34
Congress Loans................................................................34
Copyrights....................................................................19
CSD Acquisition................................................................1
CSD Acquisition Assets........................................................28
CSD Acquisition Documents.....................................................28
CSD Balance Sheets.............................................................8
CSD Business...................................................................5
CWA...........................................................................23
DTC...........................................................................31
Employee Plans................................................................14
Environmental Claims..........................................................23
Environmental Laws............................................................23
Environmental Liabilities.....................................................23
Environmental Lien............................................................23
Environmental Permits.........................................................24
EPCRA.........................................................................23
ERISA.........................................................................14
ERISA Affiliate...............................................................14
FIFRA.........................................................................23



Financing Agreement............................................................1
Foreign Pension Plan..........................................................16
FRBP..........................................................................33
GAAP...........................................................................8
Governmental Authority........................................................24
Handle........................................................................24
Hazardous Materials...........................................................24
Indebtedness..................................................................12
Indemnified Liabilities.......................................................36
Indemnitees...................................................................36
Initial Lenders................................................................1
Intellectual Property.........................................................19
Intellectual Property Contracts...............................................19
Investment Company Status.....................................................29
Investors Rights Agreement.....................................................1
Irrevocable Transfer Agent Instructions.......................................31
Legal Requirements............................................................14
Licensed Intellectual Property................................................20
Liens..........................................................................6
Material Adverse Effect........................................................4
McKim..........................................................................1
OSHA..........................................................................23
Patents.......................................................................19
PBGC..........................................................................15
Permits.......................................................................25
Policies......................................................................25
Preferred Shares...............................................................2
Preferred Stock................................................................1
Preferred Stock Certificates...................................................2
Principal Market..............................................................31
Purchase Price.................................................................2
RCRA..........................................................................23
Registered....................................................................20
Regulation D...................................................................3
Release.......................................................................24
Remedial Action...............................................................24
Required Policies.............................................................25
Resolutions...................................................................35
Rule 144.......................................................................3
Sale Order....................................................................33
SEC............................................................................3
SEC Documents..................................................................8
Securities.....................................................................5
Series B Preferred Stock.......................................................6
Shareholder's Rights Plan.....................................................27
Stockholder Approval..........................................................31
Subsidiaries...................................................................4



Suit..........................................................................17
Technology Systems............................................................20
Title IV Plan.................................................................15
TOSCA.........................................................................23
Trade Secrets.................................................................19
Trademarks....................................................................19
Transaction Documents..........................................................5
Voting Agreement...............................................................1
Voting Shareholders............................................................1






                          SECURITIES PURCHASE AGREEMENT


          SECURITIES PURCHASE AGREEMENT (the "Agreement"), dated as of September
6, 2002, by and among Clean Harbors,  Inc., a  Massachusetts  corporation,  with
headquarters located at 1501 Washington Street, Braintree,  Massachusetts  02184
(the  "Company")  and the  Buyers  listed on the  signature  pages  hereto  (the
"Buyers").

          WHEREAS,  the Company  proposes to purchase  substantially  all of the
assets  of  the  Chemical  Services  Division  of  Safety-Kleen  Corp.  and  its
subsidiaries, each as a debtor-in-possession (collectively,  "CSD"), pursuant to
Sections 363/365 of the United States Bankruptcy Code (the "CSD Acquisition");

          WHEREAS,  simultaneously  herewith,  the  Company  and  certain of its
Subsidiaries,   as  borrowers,   certain  of  the  Company's  Subsidiaries,   as
guarantors,  the lenders from time to time  parties  thereto,  as lenders,  (the
"Initial  Lenders") and Ableco Finance,  LLC, as agent for the Initial  Lenders,
have  entered  into a Financing  Agreement,  dated as of the date  hereof  (such
agreement as in effect on the date hereof, the "Financing Agreement"),  pursuant
to which the Initial Lenders have agreed to make senior and senior  subordinated
loans  and  other  extensions  of  credit  to the  Company  to  finance  the CSD
Acquisition, to refinance certain indebtedness and for other proper purposes;

          WHEREAS,  the  Buyers,  each  of whom  is an  affiliate  of one of the
Initial Lenders, desire to purchase from the Company, and the Company desires to
sell and issue to the Buyers shares of Series C Convertible Preferred Stock, par
value  $0.01 per  share,  of the  Company  (the  "Preferred  Stock"),  which are
convertible into shares (the "Conversion Shares") of the Company's Common Stock,
par  value  $0.01  per  share  (the  "Common  Stock"),   and  have  the  rights,
restrictions, privileges and preferences set forth in the Certificate of Vote of
Directors Establishing a Series of a Class of Stock, (the "Certificate"),  which
shall contain the vote and the  description  of Series C  Convertible  Preferred
Stock in the form attached hereto as Exhibit A;

          WHEREAS,  contemporaneously  with the  execution  and delivery of this
Agreement,  the  Company,  the Buyers and Alan S. McKim and the  Trustees of the
Alan S. McKim Children's Trust, who are significant  shareholders of the Company
(collectively,  "McKim") are executing and delivering to each other an Investors
Rights  Agreement  substantially  in the form attached  hereto as Exhibit B (the
"Investors Rights Agreement"),  pursuant to which the Company has agreed,  among
other things,  to provide to the Buyers  certain  registration  rights under the
Securities  Act of  1933,  as  amended  (the  "1933  Act")  and  the  rules  and
regulations  promulgated  thereunder and applicable  state  securities  laws and
McKim has,  among other  things,  agreed to grant the Buyers  certain  rights to
tag-along to sales of Common Stock by McKim;

          WHEREAS,  contemporaneously  with the  execution  and delivery of this
Agreement,  the Company and certain  shareholders  of the Company  (the  "Voting
Shareholders")  are  executing and  delivering to the Buyers a Voting  Agreement
substantially in the form attached hereto as Exhibit C (the "Voting Agreement"),

                                     - 1 -



pursuant to which the Voting  Shareholders  have agreed,  among other things, to
vote in favor of any matter brought to a vote of the shareholders of the Company
regarding  the  transactions  contemplated  hereby  and  the  other  Transaction
Documents (as defined herein); and

          WHEREAS,  the location of defined terms in this Agreement is set forth
on the Index of Terms attached hereto.

          NOW,  THEREFORE,  in consideration  of the foregoing  premises and the
covenants and agreements contained herein, the parties agree as follows:

          1.  PURCHASE AND SALE OF PREFERRED SHARES.

               a.  Purchase of  Preferred  Shares.  Subject to the  satisfaction
(or  waiver)  of the  conditions  set  forth in  Sections  6 and 7 below  and in
reliance on the  representations,  warranties,  covenants  and other  agreements
herein, the Company shall issue and sell to each Buyer, and each Buyer severally
agrees  to  purchase  from the  Company,  the  respective  number  of  shares of
Preferred Stock (the "Preferred Shares") set forth opposite such Buyer's name on
Schedule  A (the  "Closing")  at a purchase  price of $1,000  per  share,  or an
aggregate  purchase price for all Preferred  Shares of $25,000,000 the "Purchase
Price").

               b.  The Closing.  The date and time  of the Closing (the "Closing
Date") shall be 10:00 a.m.,  New York City time,  on  September 10, 2002,  or if
earlier,  on the first  Business  Day  after  which all  conditions  to  closing
identified in Sections 6 and 7 hereof have been satisfied or waived by the party
entitled to grant such  waiver (or such later date as is  mutually  agreed to by
the Company and the Buyers).  The Closing shall occur on the Closing Date at the
offices of Schulte Roth & Zabel LLP, 919 Third Avenue, New York, New York 10022.
For all purposes of this Agreement,  the term "Business Day" means any day other
than Saturday,  Sunday or other day on which commercial banks in The City of New
York are authorized or required by law to remain closed.

                c.  Payment and Delivery. Subject to the terms and conditions of
this Agreement, on the Closing Date,

                    (i)  each  Buyer  shall pay  its  respective  share  of  the
Purchase  Price set forth on Schedule A to the Company for the Preferred  Shares
to be issued and sold to such Buyer by wire  transfer of  immediately  available
funds in accordance with the Company's written wire instructions; and

                    (ii)   the  Company  shall   deliver  to  each  Buyer  stock
certificates (in the  denominations as such Buyer shall request) (the "Preferred
Stock  Certificates"),  representing  such number of the Preferred  Shares which
such Buyer is then purchasing  hereunder,  in each case, duly executed on behalf
of the Company and registered in the name of such Buyer or its nominee(s).

          2.  BUYER'S REPRESENTATIONS AND WARRANTIES.

          Each Buyer represents and warrants with respect to only itself that:

                                     - 2 -



               a.  Organization and Qualification.  Such Buyer is an entity duly
authorized  and  validly   existing  under  the  laws  of  its  jurisdiction  of
organization  and has the requisite  power to carry on its business as it is now
being conducted and currently proposed to be conducted.

               b.  Authorization; Enforcement; Validity.  This Agreement and the
Investors Rights Agreement have been duly and validly  authorized,  executed and
delivered on behalf of such Buyer and are legal,  valid and binding  obligations
of such Buyer,  enforceable  against such Buyer in accordance  with their terms,
subject as to enforceability  to general  principles of equity and to applicable
bankruptcy,  insolvency,  reorganization,   moratorium,  liquidation  and  other
similar laws relating to, or affecting generally,  the enforcement of applicable
creditors' rights and remedies.

               c. Investment Purpose. Such Buyer is acquiring the Securities for
its own (or an Affiliate's)  account and not with a view towards,  or for resale
in connection with, the public sale or distribution thereof,  except pursuant to
sales  registered or exempted  under the 1933 Act;  provided,  however,  that by
making the representations  herein, such Buyer does not agree to hold any of the
Securities  for any minimum or other  specific  term and  reserves  the right to
dispose of the Securities at any time.

               d.   Accredited Investor Status.   Such Buyer  is an  "accredited
investor" as that term is defined in Rule 501(a)(3) of Regulation D ("Regulation
D") as promulgated by the United States Securities and Exchange  Commission (the
"SEC") under the 1933 Act.

               e.  Reliance on Exemptions.   Such  Buyer  understands  that  the
Securities  are being offered and sold to it in reliance on specific  exemptions
from the  registration  requirements  of the  United  States  federal  and state
securities  laws and that the Company is relying upon the truth and accuracy of,
and such Buyer's compliance with, the representations,  warranties,  agreements,
acknowledgments  and  understandings  of such Buyer set forth herein in order to
determine the  availability of such exemptions and the eligibility of such Buyer
to acquire the Securities.

               f.  Transfer or Resale.   Such Buyer understands  that  except as
provided in the Investors Rights Agreement, the Securities have not been and are
not being  registered  under the 1933 Act or any state  securities laws, and may
not be offered for sale, sold,  assigned or transferred  unless (i) subsequently
registered thereunder,  (ii) such Securities to be sold, assigned or transferred
may be  sold,  assigned  or  transferred  pursuant  to an  exemption  from  such
registration,   or  (iii)  such  Buyer  provides  the  Company  with  reasonable
assurance,  upon  request  by the  Company,  that such  Securities  can be sold,
assigned or transferred  pursuant to Rule 144 promulgated under the 1933 Act (or
a successor rule thereto) ("Rule 144").

               g.  Legends.  Such Buyer understands that, until such time as the
sale of the Securities have been  registered  under the 1933 Act as contemplated
by the Investors  Rights  Agreement,  the stock  certificates  representing  the
Securities,  except as set  forth  below,  shall  bear a  restrictive  legend in
substantially  the  following  form  (and a  stop-transfer  order  may be placed
against transfer of such stock certificates):

                                     - 3 -



                    THE SECURITIES REPRESENTED BY  THIS CERTIFICATE
                    HAVE NOT BEEN  REGISTERED UNDER  THE SECURITIES
                    ACT OF 1933, AS AMENDED,  OR  APPLICABLE  STATE
                    SECURITIES  LAWS.   THE  SECURITIES  MAY NOT BE
                    OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED
                    (I)  EXCEPT   PURSUANT   TO  (A)  AN  EFFECTIVE
                    REGISTRATION STATEMENT FOR THE SECURITIES UNDER
                    THE SECURITIES  ACT OF  1933,  AS  AMENDED,  OR
                    APPLICABLE   STATE   SECURITIES   LAWS   OR (B)
                    PURSUANT TO RULE 144  UNDER SAID ACT OR (C) ANY
                    OTHER EXEMPTION FROM  REGISTRATION   UNDER  THE
                    1933  ACT   RELATING  TO  THE   DISPOSITION  OF
                    SECURITIES.

The legend  set forth  above  shall be removed  and the  Company  shall  issue a
certificate without such legend to the holder of the Securities upon which it is
stamped,  if, (i) such  Securities are registered for resale under the 1933 Act,
(ii) in connection  with a sale  transaction,  such holder  provides the Company
with an opinion of counsel,  in a form reasonably  acceptable to the Company, to
the effect that a public sale,  assignment or transfer of the  Securities may be
made without  registration under the 1933 Act, or (iii) such holder provides the
Company with  reasonable  assurances that the Securities can be sold pursuant to
Rule 144 without any restriction as to the number of securities acquired as of a
particular date that can then be immediately sold.

          3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

          The Company  represents  and  warrants to each of the Buyers (it being
understood  and  agreed  that,  unless  the  context  otherwise  requires,  such
representations  and  warranties  are made  assuming the  completion  of the CSD
Acquisition in accordance  with the CSD  Acquisition  Documents and after giving
full effect thereto), that:

               a.   Organization  and  Qualification.    The  Company  and   its
"Subsidiaries"  (which for purposes of this Agreement  means any entity in which
the Company,  directly or  indirectly,  owns 50% or more of the capital stock or
other  equity,  economic or similar  interests or owns capital stock or holds an
equity,  economic or similar  interest which  ownership  entitles the Company to
elect 50% or more of the board of  directors or similar  governing  body of such
entity,  and assuming the CSD  Acquisition has been completed) are entities duly
organized  and  validly  existing  in  good  standing  under  the  laws  of  the
jurisdiction in which they are incorporated, and have the requisite corporate or
other  power and  authorization  to own their  properties  and to carry on their
business as now being conducted and currently proposed to be conducted.  Each of
the Company and its  Subsidiaries is duly qualified as a foreign  corporation to
do business and is in good standing in every jurisdiction in which its ownership
of  property  or  the  nature  of  the  business  conducted  by  it  makes  such
qualification  necessary,  except  to  the  extent  that  the  failure  to be so
qualified or be in good standing would not have a Material  Adverse  Effect.  As
used in this Agreement,  "Material  Adverse  Effect" means any material  adverse
effect on the business,  properties,  assets, operations, results of operations,
prospects or financial condition of the Company and its Subsidiaries, taken as a

                                     - 4 -



whole, on the business,  assets (tangible and intangible),  accounts receivable,
rights, contracts, agreements,  instruments,  equipment, inventory, intellectual
property,   claims,   property   (real   or   otherwise),   licenses,   Permits,
authorizations,  approvals,  bank  accounts,  lockbox  arrangements,  banks  and
records and  goodwill  and  liabilities  of the  Chemical  Services  Division of
Safety-Kleen Services, Inc. acquired or assumed (by agreement,  operation of law
or otherwise) by the Company pursuant to the CSD Acquisition Documents (the "CSD
Business"),  or on the transactions contemplated hereby or by the agreements and
instruments  to be entered into in connection  herewith,  or on the authority or
ability  of the  Company  to  perform  its  obligations  under  the  Transaction
Documents (as defined below) or the  Certificate.  A true,  complete and correct
list of the Company's Subsidiaries is set forth on Schedule 3(a).

               b.  Authorization; Enforcement; Validity.   The Company  has  the
requisite   corporate  power  and  authority  to  enter  into  and  perform  its
obligations  under this Agreement,  the Investors Rights  Agreement,  the Voting
Agreement, the Irrevocable Transfer Agent Instructions (as defined in Section 5)
and  each  of the  other  agreements  entered  into  by the  parties  hereto  in
connection with the transactions  contemplated by this Agreement,  including the
Financing  Agreement,  the  Congress  Loan  Documents  and the  CSD  Acquisition
Documents (the "Transaction  Documents"),  and to issue the Preferred Shares and
the  Conversion  Shares  issuable upon  conversion  of the  Preferred  Shares in
accordance  with the terms of the  Certificate  (the  Preferred  Shares  and the
Conversion  Shares  collectively  referred to as the "Securities") in accordance
with the terms hereof and thereof. The execution and delivery of the Transaction
Documents by the Company and the execution and filing of the  Certificate by the
Company and the consummation by it of the transactions  contemplated  hereby and
thereby,  including,  without  limitation,  the  issuance  and  reservation  for
issuance  of the  Preferred  Shares  and the  Conversion  Shares  issuable  upon
conversion thereof have been duly authorized by the Company's Board of Directors
and no further consent or authorization is required by the Company, its Board of
Directors or its stockholders  (except to the extent that  stockholder  approval
may be required  pursuant to the rules of the NASD for the  issuance of a number
of  Conversion  Shares  greater in the  aggregate  than  19.99% of the number of
shares of Common Stock  outstanding  immediately  prior to the Closing Date (the
"19.99% Rule")). The Transaction Documents have been duly executed and delivered
by the  Company.  The  Transaction  Documents  constitute  the legal,  valid and
binding  obligations  of  the  Company,   enforceable  against  the  Company  in
accordance  with their terms,  except as such  enforceability  may be limited by
general   principles   of   equity   or   applicable   bankruptcy,   insolvency,
reorganization,   moratorium,  liquidation  or  similar  laws  relating  to,  or
affecting  generally,  the  enforcement of creditors'  rights and remedies.  The
Certificate  will be filed on or prior to the Closing Date with the Secretary of
State of the Commonwealth of Massachusetts  and will be in full force and effect
on or prior to the Closing Date,  enforceable  against the Company in accordance
with its terms and shall not have been  amended  unless in  compliance  with its
terms.

               c.  Capitalization.  The authorized capital stock  of the Company
consists of (i)  20,000,000  shares of Common  Stock,  of which as of August 31,
2002  12,164,312  shares  are  issued  and  outstanding,  no shares  are held in
treasury,  2,087,625 shares are reserved for issuance  pursuant to the Company's
stock  option and  purchase  plans,  and no shares are  issuable or reserved for
issuance  pursuant to  securities  (other than the  Preferred  Shares and shares
reserved for issuance  pursuant to the Company's stock option and purchase plans
and  340,480  shares of Common  Stock  reserved  for  issuance  pursuant  to the

                                     - 5 -



conversion  of the Series B  Convertible  Preferred  Stock,  par value $0.01 per
share, of the Company (the "Series B Preferred  Stock")) and 1,237,808 shares of
Common  Stock  reserved for  issuance  pursuant to the  exercise of  outstanding
warrants  to  purchase  Common  Stock)   exercisable  or  exchangeable  for,  or
convertible  into, shares of Common Stock and (ii) 2,000,000 shares of preferred
stock,  894,585 shares of which are designated  Series A Preferred  Stock of the
Company, none of which are issued and outstanding and 156,416 shares of which of
which are designated as Series B Convertible  Preferred Stock,  112,000 of which
are issued and outstanding.  All of such  outstanding  shares have been, or upon
issuance will be, validly issued and are fully paid and nonassessable. Except as
disclosed in Schedule  3(c),  (A) no Capital  Stock of the Company or any of its
Subsidiaries  are  subject  to  preemptive  rights or any other  similar  rights
(arising  under  Massachusetts  law,  the  Company's  Articles  of  Organization
(defined  below) or By-laws  (defined  below) or any  agreement or instrument to
which the Company or any of its  Subsidiaries is a party or by which the Company
or any of its Subsidiaries is bound) or any pledges,  claims, liens,  mortgages,
charges,  encumbrances and security  interests of any kind or nature  whatsoever
(collectively,  "Liens" ) granted or created  by the  Company;  (B) there are no
outstanding  debt  securities  issued by the Company or any of its  Subsidiaries
which are convertible or exercisable  into or exchangeable  for Capital Stock of
the Company or any of its  Subsidiaries;  (C) there are no outstanding  options,
warrants,  scrip,  rights to subscribe to, calls or commitments of any character
whatsoever relating to, or securities or rights convertible into or exchangeable
for, any Capital Stock of the Company or any of its Subsidiaries,  or contracts,
commitments,  understandings  or arrangements by which the Company or any of its
Subsidiaries  is or may become bound to issue  additional  Capital  Stock of the
Company  or any of its  Subsidiaries  or  options,  warrants,  scrip,  rights to
subscribe to, calls or commitments of any character  whatsoever  relating to, or
securities or rights  convertible  into or exercisable or exchangeable  for, any
Capital  Stock of the  Company  or any of its  Subsidiaries;  (D)  there  are no
agreements or arrangements under which the Company or any of its Subsidiaries is
obligated to register the sale of any of their  Capital Stock under the 1933 Act
(other than the Investors Rights Agreement); (E) there is no outstanding Capital
Stock or instrument of the Company or any of its Subsidiaries  which contain any
redemption  or  similar  provisions,  and there are no  contracts,  commitments,
understandings  or arrangements by which the Company or any of its  Subsidiaries
is or may become bound to redeem any Capital  Stock or any debt  security of the
Company or any of its Subsidiaries (other than in the Certificate); (F) there is
no  outstanding  Capital  Stock  or  instrument  of  the  Company  or any of its
Subsidiaries  containing  anti-dilution  or  similar  provisions  that  will  be
triggered by the issuance of the Securities as described in this Agreement;  and
(G) the Company does not have any stock  appreciation  rights or "phantom stock"
plans or agreements or any similar plan or agreement.  The Company has furnished
to each Buyer (or its representatives)  true, complete and correct copies of the
Company's  Articles  of  Organization,  as amended  and as in effect on the date
hereof (the "Articles of Organization"),  and the Company's By-laws,  as amended
and as in  effect  on the date  hereof  (the  "By-laws"),  and the  terms of all
securities convertible into or exercisable or exchangeable for Capital Stock and
the  material  rights of the  holders  thereof  in respect  thereto,  including,
without limitation, stock options granted under any benefit plan or stock option
plan of the Company.  For purposes of this  Agreement,  the term "Capital Stock"
means (A) with respect to any Person that is a corporation,  any and all shares,
interests,  participations or other equivalents  (however designated and whether
or not voting) of  corporate  stock,  and (B) with respect to any Person that is
not a corporation, any and all partnership, membership or other equity interests
of such Person.

                                     - 6 -



               d.   Issuance of  Securities.   The  Preferred  Shares  are  duly
authorized and, upon issuance in accordance with the terms hereof,  shall be (i)
validly issued,  fully paid and  non-assessable,  (ii) free from all taxes,  and
Liens with respect to the issuance  thereof and (iii) entitled to the rights and
preferences  set forth in the  Certificate.  As of the  Closing  Date,  at least
2,380,953  shares  of  Common  Stock  (subject  to  adjustment  pursuant  to the
Company's  covenant  set  forth in  Section  4(e)  below)  will  have  been duly
authorized and reserved for issuance of the Conversion  Shares.  Upon conversion
or issuance in accordance with the  Certificate,  as applicable,  the Conversion
Shares will be validly issued,  fully paid and  nonassessable  and free from all
taxes,  liens and charges  with respect to the issue  thereof,  with the holders
being entitled to all rights accorded to a holder of Common Stock. Based in part
on the  representations  made by the Buyers in Section 2 hereof, the issuance by
the Company of the Securities is exempt from registration under the 1933 Act.

               e.  No Conflicts.  The execution, delivery and performance of the
Transaction  Documents by the  Company,  the  performance  by the Company of its
obligations  under the  Certificate,  the  consummation  by the  Company  of the
transactions contemplated hereby and thereby (including, without limitation, the
reservation  for  issuance  and  issuance  of the  Conversion  Shares)  and  the
performance by the Company and its Subsidiaries of their respective  obligations
under the CSD Acquisition  Documents and the consummation by the Company and its
Subsidiaries of the transactions  contemplated by the CSD Acquisition  Documents
do not and will not (i) result in a violation of the Articles of Organization or
the By-laws; (ii) conflict with, or constitute a default (or an event which with
notice or lapse of time or both would become a default) under, or give to others
any rights of  termination,  amendment,  acceleration  or  cancellation  of, any
material  agreement,   indenture,  lease  or  instrument,   permit,  concession,
franchise or license to which the Company or any of its Subsidiaries is a party;
(iii) result in a violation of any law,  rule,  regulation,  order,  judgment or
decree  (including  federal and state  securities  laws and  regulations and the
rules and regulations of the Principal Market (as defined below))  applicable to
the Company or any of its  Subsidiaries or by which any property or asset of the
Company or any of its Subsidiaries is bound or affected. Neither the Company nor
its Subsidiaries is in violation,  in any material  respect,  of any term of its
Articles  of  Organization  or its  By-laws or their  organizational  charter or
by-laws or other  constituent  documents,  respectively.  Except as disclosed in
Schedule 3(e) and as specifically contemplated by this Agreement and as required
under the 1933 Act or under any applicable state securities laws, the Company is
not  required  to obtain  any  consent,  authorization  or order of, or make any
filing or registration with, any court or Governmental Authority in order for it
to execute,  deliver or perform any of its obligations  under or contemplated by
the Transaction  Documents,  to perform its obligations under the Certificate in
accordance with the terms hereof or thereof,  to complete the CSD Acquisition or
to perform its obligations under any of the CSD Acquisition Documents. Except as
disclosed in Schedule 3(e), all consents,  authorizations,  orders,  filings and
registrations  which the Company is required to obtain pursuant to the preceding
sentence  have been  obtained or effected  on or prior to the date  hereof.  The
Company and its  Subsidiaries  are unaware of any facts or  circumstances  which
might give rise to any of the foregoing.  The Company is not in violation of the
listing  requirements of the Principal Market and has no actual knowledge of any
facts which would reasonably lead to delisting or suspension of the Common Stock
by the Principal Market in the foreseeable future.

                                     - 7 -



               f.  SEC Documents; Financial Statements.

                    (i)  Except as set  forth on Schedule 3(f), since January 1,
2001, the Company has filed all reports,  schedules, forms, statements and other
documents  required  to be filed by it with the SEC  pursuant  to the  reporting
requirements of the Securities Exchange Act of 1934, as amended (the "1934 Act")
(all of the foregoing  filed prior to the date hereof and all exhibits  included
therein  and  financial   statements   and   schedules   thereto  and  documents
incorporated  by reference  therein  being  hereinafter  referred to as the "SEC
Documents"). As of the date of filing of such SEC Documents, such SEC Documents,
as it may have been subsequently amended by filings made by the Company with the
SEC  prior  to the date  hereof,  complied  in all  material  respects  with the
requirements  of the  1934  Act  and  the  rules  and  regulations  of  the  SEC
promulgated  thereunder  applicable  to the  SEC  Documents.  None  of  the  SEC
Documents,  as of the date filed and as they may have been subsequently  amended
by filings made by the Company with the SEC prior to the date hereof,  contained
any  untrue  statement  of a material  fact or omitted 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.  As of their  respective  dates,  the  financial  statements  of the
Company  included  in the SEC  Documents  complied  as to  form in all  material
respects with  applicable  accounting  requirements  and the published rules and
regulations of the SEC with respect thereto. Such financial statements have been
prepared  in  accordance   with  generally   accepted   accounting   principles,
consistently  applied,  during  the  periods  involved  (except  (i)  as  may be
otherwise  indicated in such financial  statements or the notes thereto, or (ii)
in the case of  unaudited  interim  statements,  to the extent  they may exclude
footnotes or may be condensed or summary  statements)  and fairly present in all
material  respects the  consolidated  financial  position of the Company and its
Subsidiaries  as of the dates thereof and the results of its operations and cash
flows for the periods then ended (subject,  in the case of unaudited statements,
to  normal  year-end  audit  adjustments).  None of the  Company  nor any of its
Subsidiaries have any material liabilities or obligations of any nature (whether
known  or  unknown,  and  whether  absolute,   accrued,   contingent,   matured,
liquidated,  unasserted or  otherwise) of a kind required by generally  accepted
accounting  principles ("GAAP") to be set forth on a financial statement that is
not  fully  and  adequately  reflected  or  reserved  against  in the  financial
statements contained in the Company's most recent Annual Report on Form 10-K and
Quarterly  Report  on Form  10-Q  filed  with the SEC,  other  than  liabilities
expressly  assumed in connection  with the CSD  Acquisition  and liabilities and
obligations  incurred  since June 30,  2002 in the  ordinary  course of business
consistent with past practice that are not material in amount.

                    (ii)  The  Company  has  delivered  to  each  Buyer  (or its
representatives) true, complete and correct copies of the audited balance sheets
of the CSD Business as of the fiscal years of the CSD Business  ended August 31,
1999,  2000 and 2001,  together with a report  thereon from Arthur  Andersen LLP
(collectively, the "CSD Balance Sheets"). The Company has also delivered to each
Buyer  (or  its  representatives)  true,  complete  and  correct  copies  of the
unaudited  consolidated  balance sheet of the Company and its Subsidiaries as of
June 30, 2002 and the related consolidated statements of operations,  cash flows
and  stockholders'  equity for the six month  period  then  ended (the  "Company
Financial  Statements  ".  The CSD  Balance  Sheets  and the  Company  Financial
Statements  fairly present the consolidated  financial  condition of the Company
and its  Subsidiaries or the CSD, as the case may be, as at the respective dates
thereof  and the  consolidated  results of  operations  of the  Company  and its
Subsidiaries  for the fiscal  periods  ended on such  respective  dates,  all in
accordance with GAAP. To the best of the Company's knowledge,  after due inquiry

                                     - 8 -



of the management of the CSD  responsible for the preparation of the CSD Balance
Sheets,  the CSD Balance  Sheets fairly  present in accordance  with GAAP in all
material respects each item of working capital, line item by line item as of the
dates indicated thereon.

                    (iii) The Company has heretofore furnished to each Buyer (A)
projected  quarterly  balance sheets and statements of operations and cash flows
of the Company and its Subsidiaries (after giving effect to the CSD Acquisition)
for the period from October 1, 2002 through  December 31, 2004 and (B) projected
annual balance sheets and statements of operations and cash flows of the Company
and its  Subsidiaries  for the fiscal years ending in 2002  through  2007.  Such
projections are believed by the Company to be reasonable,  have been prepared on
a  reasonable  basis  and in good  faith  by the  Company  in  light  of (w) the
historical  financial  performance of the Company,  (x) to the best knowledge of
management of the Company,  after reasonable  inquiry,  the projected  financial
performance of CSD, (y) current and reasonably  foreseeable  business conditions
and (z) believed by the Company to be  reasonable  at the time made and upon the
best  information then reasonably  available to the Company.  The Company is not
aware of any  facts or  information  that  would  lead it to  believe  that such
projections are incorrect or misleading in any material respect.

               g.  Full Disclosure.  No  other  information  provided  by or  on
behalf of the Company to the Buyers which is not included in the SEC  Documents,
including, without limitation, information referred to in Section 2(f), contains
any untrue  statement  of a material  fact or omits to state any  material  fact
necessary  in  order  to  make  the  statements  therein,  in the  light  of the
circumstances under which they are or were made, not misleading.  The Company is
not  required  to file and will not be  required  to file any  agreement,  note,
lease, mortgage,  deed or other instrument entered into prior to the date hereof
and to which the Company or any Subsidiary is a party or by which the Company or
any Subsidiary is bound which has not been previously filed as an exhibit to its
reports filed with the SEC under the 1934 Act.

               h.  Absence of Certain Changes.  Since June 30, 2002, neither the
Company nor any of its Subsidiaries has:

                    (i)   suffered  any Material  Adverse Effect  or  any event,
change occurrence or development,  reasonably likely to cause or have a Material
Adverse Effect;

                    (ii)   conducted its  business and operations  other than in
the ordinary course of business and consistent with past practices;

                    (iii)  except for the  dividend of $1.00  per share  paid in
cash on July 15,  2002,  to the  holders of the  Company's  112,000  outstanding
shares of Series B Convertible Preferred Stock,  declared, set aside or paid any
dividend on, or other distribution  (whether in cash, stock or property,  or any
combination  thereof)  in  respect  of,  any  of  the  Company's  or  any of its
Subsidiary's  Capital  Stock,  or purchased,  redeemed or otherwise  acquired or
agreed to  purchase,  redeem or  otherwise  acquire,  any  Capital  Stock of the
Company or its Subsidiaries or any options, warrants, calls or rights to acquire
any such Capital Stock, other than dividends from any wholly-owned Subsidiary of
the  Corporation to the  Corporation or another  wholly-owned  Subsidiary of the
Corporation;

                                     - 9 -



                    (iv)  undergone  a  material  change in  accounting  method,
principles  or  practices,  except as may be required by a concurrent  change in
GAAP or disclosed in the footnotes to any of the financial  statements  included
in the SEC Documents;

                    (v)  except as  required by this Agreement,  authorized  for
issuance,  sold,  delivered,  granted or issued any  options,  warrants,  calls,
subscriptions  or other rights for, or  otherwise  agreed or committed to issue,
sell,  deliver or grant any shares of any class of Capital  Stock of the Company
or any of its Subsidiaries or any securities convertible into or exchangeable or
exercisable  for  shares of any class of  Capital  Stock of the  Company  or its
Subsidiaries;

                    (vi)   except  in   the  ordinary  course  of  business  and
consistent  with past  practice  and  except in  connection  with the  Financing
Agreement,   the  Congress  Loan  Documents  and  in  connection  with  the  CSD
Acquisition,  as  described  in Schedule  3(h)(vi),  (A) created or incurred any
indebtedness for borrowed money, (B) assumed, guaranteed,  endorsed or otherwise
as an accommodation  become responsible for the obligations of any other Person,
(C) made any loans or advances to any other Person, or (D) mortgaged, pledged or
subjected  to any  Lien,  any asset  having a book or market  value in excess of
$100,000;

                    (vii)  granted any increase  in the  base  compensation  of,
or made any other material change in employment terms for, any of its directors,
officers  and  employees,  except for  increases  or changes  based upon changed
responsibilities  or duties and increases or changes made in the ordinary course
of business consistent with past practice;

                    (viii)  adopted, modified  or terminated any bonus,  profit-
sharing,  incentive,  severance or other plan or contract for the benefit of any
of its  directors,  officers  and  employees  other  than  changes  which do not
materially increase the aggregate cost of such plan or contract;

                    (ix)  except for the  provision of services  or sales in the
ordinary  course of business and consistent  with past practice,  sold,  leased,
licensed,  transferred  or  otherwise  disposed of any of its assets or property
having a book or market value in excess of $100,000;

                    (x)   entered into any  new line of business, or incurred or
committed  to incur any capital  expenditures,  obligations  or  liabilities  in
connection therewith in excess of $1,000,000 in the aggregate;

                    (xi)  other than the CSD Acquisition,  acquired or agreed to
acquire by merging or  consolidating  with, or agreed to acquire by purchasing a
substantial  portion of the assets of, or in any other  manner,  any business of
any other Person for aggregate consideration valued at more than $500,000;

                    (xii)  made any  cancellation or  waiver  of (A)  any  right
material to the operation of the business of the Company or its Subsidiaries, or
(B) any debts or claims against any affiliate of the Company;

                                     - 10 -



                    (xiii)  made any disposition of, or failed to keep in effect
any material right in, to or for the use of any material  Intellectual  Property
of the Company or its Subsidiaries;

                    (xiv)  suffered any damage,  destruction or loss, whether or
not  covered  by  insurance,  that  has had or is  reasonably  likely  to have a
Material Adverse Effect;

                    (xv)  entered into any agreement, arrangement or transaction
with any shareholder, employee, officer or director of the Company or any of its
Subsidiaries  (other  than  customary  agreements  for  services  as  employees,
officers and  directors  that have been filed as exhibits to an SEC Document) or
any Person controlling, controlled by or under common control with the Company;

                    (xvi)  except in  connection  with  the  CSD Acquisition  as
described in subsections  (x) through (xii) of Section  6.01(r) of the Financing
Agreement,  incurred or project to incur any  closure,  clean-up or  remediation
costs with  respect to any current or formerly  owned or leased  property of the
Company or any of its Subsidiaries in excess of $1,000,000 in the aggregate; or

                    (xvii)   agreed to do any  of  the  things described  in the
preceding clauses (i) through (xvi).

              The Company has not taken any steps, and does not currently expect
to take any steps,  to seek  protection  pursuant to any bankruptcy law nor does
the Company or any of its  Subsidiaries  have any knowledge or reason to believe
that its creditors intend to initiate involuntary  bankruptcy proceedings or any
actual knowledge of any fact which would reasonably lead a creditor to do so.

               i.  Material Contracts.

                    (i)  Neither the  Company nor  any of its  Subsidiaries is a
party to or bound by, and neither they nor their  properties are subject to, any
contracts, agreements or arrangements required to be disclosed in a Form 10-K or
10-Q under the  Exchange  Act which is not filed as an exhibit to one or more of
the SEC Documents filed and publicly available.

                    (ii)  Schedule 3(i)  sets forth  as of the  date  hereof (A)
a  list  of  all  written  and  oral  contracts,   agreements,   instruments  or
arrangements  to which the Company or any of its  Subsidiaries  is a party or by
which the Company or such Subsidiary or any of their respective  assets is bound
which would be required to be filed as exhibits to the  Company's  Annual Report
on Form 10-K for the year ending  December 31, 2001 or any  subsequent  Exchange
Act filing by the Company,  including,  without limitation,  all such contracts,
agreement,  instrument and arrangements  relating to the CSD Business that would
have been  required to be filed by the Company as an exhibit to an SEC  Document
had the CSD Acquisition  occurred prior to the date of this  Agreement;  and (B)
the  following   written  and  oral  arrangements  (all  such  written  or  oral
agreements,  arrangements  or  commitments  as are  required  to be set forth on
Schedule  3(i) or  filed  as  exhibits  to any SEC  Document,  collectively  the
"Material Contracts"):

                                     - 11 -



                    (A)  each partnership, joint venture or similar agreement of
the Company or any of its  Subsidiaries  with another Person that is material to
the operation of the business of the Company or any of its  Subsidiaries  or the
CSD Business;

                    (B)  each  contract or agreement  under which the Company or
any of its Subsidiaries  have created,  incurred,  assumed or guaranteed (or may
create,  incur,  assume or  guarantee)  Indebtedness  of more than  $100,000  in
principal  amount or under  which the  Company or any of its  Subsidiaries  have
imposed  (or may  impose)  a Lien on any of  their  respective  assets,  whether
tangible  or   intangible   securing   Indebtedness   in  excess  of   $100,000.
"Indebtedness" shall have the meaning ascribed to such term in the Certificate;

                    (C)  each contract or agreement  to which the Company or any
of its Subsidiaries is a party which involves an obligation or commitment to pay
or be paid an amount in excess of $1,000,000 per year;

                    (D) each contract or agreement which involves or contributes
to the Company or any of its Subsidiaries  aggregate annual  remuneration  which
exceeds  2% of the  Company's  and its  Subsidiaries'  consolidated  annual  net
revenues  for the twelve  months ended  December 31, 2000,  December 31, 2001 or
December 31, 2002 (projected),  in each case both before and after giving effect
to the CSD Acquisition;

                    (E)  each contract  or  agreement  relating to employment or
consulting which provides for annual compensation in excess of $100,000 and each
severance,  termination,  confidentiality,  non-competition  or  indemnification
agreement or arrangement with any of the directors, officers, consultants or key
employees of the Company or any of its Subsidiaries;

                    (F)  each contract or  agreement to which the Company or any
of its Subsidiaries or affiliates is a party limiting,  in any material respect,
the right of the  Company  or any of its  Subsidiaries  (x) to engage  in, or to
compete with any Person in, any business,  including  each contract or agreement
containing exclusivity provisions restricting the geographical area in which, or
the method by which,  any business may be conducted by the Company or any of its
Subsidiaries or affiliates or (y) to solicit any customer or client;

                    (G)  all contracts or agreements  between the Company or any
of its Subsidiaries and any  shareholder,  employee,  officer or director of the
Company or any Subsidiary,  and any Person  controlling,  controlled by or under
common control with the Company;

                    (H)   each   contract,  agreement  and  franchise  with  any
municipality,  county or city for waste collection, disposal, recycling or other
services  which  provides for aggregate  payments in excess of $1,000,000 and is
for a term of one year or longer (whether or not subject to early termination);

                    (I) all other contracts or agreements which are  material to
the Company  and its  Subsidiaries  taken as a whole or the CSD  Business or the
conduct of their  respective  businesses,  other than those made in the ordinary
course of business or those  which are  terminable  by the Company or any of its

                                     - 12 -



Subsidiaries  upon no greater than 60 days prior  notice and without  penalty or
other adverse consequence;

                    (J)  all  contracts  or  agreements  pursuant  to  which the
Company  or any of its  Subsidiaries  is  required  to make  payment of any cure
amount under  contract or agreement  being assigned by the CSD to the Company or
any of its Subsidiaries; and

                    (K) all other contracts or agreements obligating the Company
or any of its Subsidiaries to indemnify or guarantee the  indemnification of any
other Person.

                     (iii)  All the Material Contracts are valid, subsisting, in
full force and effect,  binding upon the Company or one of its  Subsidiaries  in
accordance with their terms,  and to the knowledge of the Company,  binding upon
the other parties  thereto in accordance  with their terms.  The Company and its
Subsidiaries  have paid in full or accrued  all  amounts now due from them under
the  Material  Contracts  (including  all cure  amounts due under  contracts  or
agreements  referred to in Section 3(i)(ii)(J) above) and have satisfied in full
or provided  for all of their  liabilities  and  obligations  under the Material
Contracts which are presently  required to be satisfied or provided for, and are
not (with or without notice or lapse of time or both) in default in any material
respect under any of the Material  Contracts nor to the knowledge of the Company
is any other  party to any such  Material  Contract  (with or without  notice or
lapse of time or both) in default in any material respect thereunder.  No notice
of termination or  cancellation  or intent to terminate or cancel has been given
by the Company or any Subsidiary to any other party to any Material Contract and
none of the Company nor any  Subsidiary  has received  notice of  termination or
cancellation of a Material  Contract or the intention to terminate or cancel any
Material Contract from any other party thereto, and, to the Company's knowledge,
no basis  exists  for any  such  termination  or  cancellation  of any  Material
Contract.

               j.   Absence of Litigation. There is no action, suit, proceeding,
inquiry  or  investigation  before  or by any court or  Governmental  Authority,
self-regulatory organization or body pending or, to the knowledge of the Company
or any of its Subsidiaries, threatened against or affecting the Company, the CSD
Acquisition, the CSD Business or any of the Company's Subsidiaries or any of the
Company's  or  the  Company's  Subsidiaries'  officers  or  directors  in  their
capacities as such,  except as expressly set forth in Schedule 3(j), which seeks
injunctive or declaratory  relief  against or affecting the Company,  any of its
Subsidiaries or any of their respective assets or properties or, with respect to
the Company and its  Subsidiaries,  that if adversely  determined,  could have a
Material Adverse Effect. To the knowledge of the Company,  none of the directors
or  officers  of the  Company  have  been a  party  to  any  securities  related
litigation during the past five years.

               k.  Acknowledgment Regarding Buyer's Purchase of Securities.  The
Company  acknowledges and agrees that each of the Buyers is acting solely in the
capacity of an arm's length purchaser with respect to the Transaction  Documents
and the Certificate and the transactions  contemplated  hereby and thereby.  The
Company  further  acknowledges  that each  Buyer is not  acting  as a  financial
advisor or fiduciary of the Company (or in any similar capacity) with respect to
the Transaction Documents and the Certificate and the transactions  contemplated
hereby and  thereby  and any  advice  given by any of the Buyers or any of their
respective   representatives  or  agents  in  connection  with  the  Transaction
Documents  and  the  Certificate  and the transactions  contemplated  hereby and

                                     - 13 -



thereby is merely  incidental to such Buyer's  purchase of the  Securities.  The
Company  further  represents to each Buyer that the Company's  decision to enter
into  the  Transaction  Documents  has  been  based  solely  on the  independent
evaluation by the Company and its representatives.

               l.  Compliance with Law.  Except  as set forth on  Schedule 3(l),
none of the Company, any of its Subsidiaries or, to the Company's knowledge, the
CSD  Business  (i) has  violated or  conducted  its  business or  operations  in
violation of, and has not used or occupied its  properties or assets in material
violation of, any statute,  law, ordinance,  rule,  regulation,  permit,  order,
writ, judgment,  injunction,  decree or award issued,  enacted or promulgated by
any Governmental Authority or any arbitrator ("Legal Requirements"), (ii) to the
Company's  knowledge,  has been alleged to be in material violation of any Legal
Requirement,  and (iii) has  received  any  notice of any  violation  or alleged
material  violation of, or any citation for material  non-compliance  with,  any
Legal Requirements.

               m.  No General Solicitation. Neither the Company, nor  any of its
affiliates,  nor any person  acting on its or their  behalf,  has engaged in any
form of general  solicitation  or general  advertising  (within  the  meaning of
Regulation  D under  the 1933 Act) in  connection  with the offer or sale of the
Securities.

               n.   No Integrated Offering.  Neither the Company, nor any of its
affiliates,  nor any  person  acting on its or their  behalf  has,  directly  or
indirectly,  made any offers or sales of any security or solicited any offers to
buy any security,  under  circumstances  that would require  registration of the
issuance  by the  Company of any of the  Securities  under the 1933 Act or cause
this offering of the  Securities to be  integrated  with prior  offerings by the
Company for purposes of the 1933 Act or,  except as set forth on Schedule  3(n),
any applicable stockholder approval provisions,  including,  without limitation,
under the rules and regulations of the Principal Market, nor will the Company or
any of its Subsidiaries take any action or steps that would require registration
of the issuance by the Company of any of the  Securities  under the 1933 Act or,
except as set forth on Schedule 3(n), cause the offering of the Securities to be
integrated with other offerings.

               o.   Employee Benefit Plans;  Labor  Matters.  (i)  Schedule 3(o)
lists all "employee  benefit  plans," as defined in Section 3(3) of the Employee
Retirement Income Security Act of 1974, as amended  ("ERISA"),  and all material
bonus,  stock option,  stock  purchase,  stock  appreciation  right,  incentive,
deferred  compensation,  supplemental  retirement,  severance  and other similar
material fringe or employee benefit plans,  programs,  policies or arrangements,
any material employment,  consulting or executive  compensation  agreements that
are currently  maintained or have been  maintained  within the last six years by
the Company or any trade or business  under common  control with the Company (an
"ERISA  Affiliate"),  within the meaning of Section 414 of the Internal  Revenue
Code of 1986, as amended (the  "Code"),  or under which the Company or any ERISA
Affiliate  has, or within the last six years had, any liability or obligation to
contribute,  for the benefit of or relating to any employee,  former employee or
retiree of the Company or any ERISA  Affiliate  (collectively,  for  purposes of
this Section 3(o), referred to as the "Employee Plans").

                                     - 14 -



                    (ii)  With respect to  any Employee Plan,  where applicable,
(A) such Employee Plan has been maintained in accordance  with ERISA,  the Code,
the terms of such Employee Plan and other applicable Legal  Requirements;  (B) a
favorable  determination  letter  has been  obtained  from  the IRS,  and a copy
thereof delivered to each Buyer, for any such Employee Plan that is an "employee
pension  benefit  plan" within the meaning of Section 3(2) of ERISA and which is
intended to be qualified  within the meaning of Section  401(a) of the Code, and
since such  determination  letter,  no event has occurred that would  disqualify
such Plan; (C) there has been no non-exempt "prohibited  transaction" (including
without limitation as a result of any of the transactions  contemplated  hereby)
within  the  meaning of  Section  4975(c)  of the Code or  Section  406 of ERISA
involving the assets of any Employee  Plan; and (iv) neither the Company nor any
ERISA Affiliate is or was during the preceding six years obligated to contribute
to any  multiemployer  plan and neither the Company nor any ERISA  Affiliate has
assumed any  obligation  of any  predecessor  of the Company with respect to any
multiemployer plan.

                    (iii)  There are no pending actions which have been asserted
in writing or instituted  (other than in respect of benefits due in the ordinary
course which,  in the  aggregate are not material)  against the assets of any of
the  Employee  Plans or  against  the  Company  or any  ERISA  Affiliate  or any
fiduciary of the Employee Plans with respect to the Employee Plans.

                    (iv)  Except as required  by Section 4980B of  the Code,  no
Employee  Plan or other  arrangement  provides  medical or death  benefits  with
respect to current or former  employees  of the  Company or any ERISA  Affiliate
beyond their  retirement or other  termination of employment.  Any  continuation
coverage  provided under any welfare  benefits plans complies with Section 4980B
of the Code and is at the expense of the participant or beneficiary.

                    (v)  No Employee Plan  has incurred an  "accumulated funding
deficiency" and there has not been any unpaid required installments,  within the
meaning  of  Section  412 of the  Code,  nor has there  been  issued a waiver or
variance of the minimum  funding  standards  imposed by the Code with respect to
any Employee Plan that is subject to Title IV of ERISA (a "Title IV Plan"),  nor
has any Lien  been  created  under  Section  302(f)  of ERISA or  security  been
required  under Section 307 of ERISA,  nor are any excise taxes due or hereafter
to become due under Section 4971 or 4972 of the Code with respect to the funding
of any such plan for any plan year or other  fiscal  period  ending on or before
the Closing Date. With respect to each Title IV Plan, there has not occurred any
reportable  event  within  the  meaning  of  Section  4043(b)  of  ERISA  or the
regulations  thereunder.  The Pension Benefit Guaranty  Corporation ("PBGC") has
not  instituted  or, to the  knowledge  of the  Company or any ERISA  Affiliate,
threatened a proceeding to terminate any Title IV Plan. All PBGC premiums due on
or before the Closing  Date with  respect to any Title IV Plan have been paid in
full,  including  late  fees,  interest  and  penalties,  if and  to the  extent
applicable.  True,  correct and  complete  copies of the most  recent  actuarial
report which accurately reflects the funded status and contribution requirements
for  each   Title  IV  Plan  have  been   delivered   to  each   Buyer  (or  its
representatives).  There has been no  material  adverse  change  in the  assets,
liabilities  or  financial  position of each Title IV Plan since the date of the
most recent actuarial  report.  Neither the Company nor any ERISA Affiliate has,
at any time within the five year period preceding the Closing Date, entered into

                                     - 15 -



any transaction  the principal  purpose of which was to evade liability to which
the Company or such ERISA Affiliate would otherwise be subject under Title IV of
ERISA.  The principal  purpose of the Company in entering into the  transactions
contemplated  by this  Agreement is not to evade  liability to which the Company
would otherwise be subject under Title IV of ERISA.

                    (vi) No Employee Plan or agreement, program, policy or other
arrangement  by its  terms or in  effect  would or could  possibly  require  any
payment or transfer of money,  property or other  consideration on account of or
in connection with the  transactions  contemplated by this Agreement,  including
but not limited to any employee  (current,  former or retired) of the Company or
any  ERISA  Affiliate  (whether  or not any  such  payment  would  constitute  a
"parachute  payment" or "excess parachute payment" within the meaning of Section
280G of the Code).

                    (vii)  Neither the  Company  nor  any  ERISA  Affiliate  has
incurred any  obligations  in connection  with the  termination of or withdrawal
from any Foreign Pension Plan (as defined below), or has any unfunded  liability
with respect to benefits under any such Foreign Pension Plan.  "Foreign  Pension
Plan"  means any plan,  fund or other  similar  program  maintained  outside the
United States of America primarily for the benefit of employees residing outside
of the United States of America, or that has been maintained within the last six
years by the  Company or any ERISA  Affiliate  or under which the Company or any
ERISA  Affiliate has had any  liability or  obligation to contribute  within the
past six years,  which plan, fund or other similar program  provides  retirement
income for such employees, results in a deferral of income for such employees in
contemplation  of retirement or provides  payments to be made to such  employees
upon  termination of  employment,  and which plan is not subject to ERISA or the
Code.

                    (viii)  Any terminated Employee Plan  has been terminated in
accordance with applicable law, all benefits under any such terminated  Employee
Plan have been fully paid to the  participants  and  beneficiaries in accordance
with the terms of such  Employee  Plan,  and  neither  the Company nor any ERISA
affiliate has any continuing  liability or other obligation with respect to such
Employee Plan.

                    (ix)  Neither  the  Company  nor  its  ERISA Affiliates  has
incurred any material  liability or obligation  under the Worker  Adjustment and
Retraining  Notification Act or similar state Legal Requirements,  which remains
unpaid or unsatisfied

                    (x) Except as listed in  Schedule 3(o), neither  the Company
nor any  ERISA  Affiliate  is a party to any  employment,  labor  or  collective
bargaining agreement. No labor organization or group of employees of the Company
or  any  ERISA   Affiliate  has  made  a  pending  demand  for   recognition  or
certification   to  the  Company  or  any  ERISA  Affiliate  and  there  are  no
representation   or   certification   proceedings   or   petitions   seeking   a
representation proceeding presently pending or threatened to be brought or filed
with the National Labor Relations Board or any other labor relations tribunal or
authority  relating to the Company or any ERISA  Affiliate.  Except as listed in
Schedule 3(o), there are no organizing  activities  involving the Company or any
ERISA affiliate pending with any labor organization or group of employees of the
Company.

                                     - 16 -



                    (xi)  There are no unfair labor practice charges, grievances
or complaints pending or, to the knowledge of the Company or any ERISA Affiliate
threatened  in writing by or on behalf of any  employee or group of employees of
the Company or any ERISA Affiliate.  There is no labor strike, work stoppage, or
lockout pending or affecting the Company or any ERISA Affiliate.

                    (xii)  There are no  complaints, charges,  or claims against
the Company or any ERISA Affiliate  pending,  or to the knowledge of the Company
or any ERISA Affiliate,  threatened in writing to be brought or filed,  with any
authority  or  arbitrator  based on,  arising  out of, in  connection  with,  or
otherwise  relating  to the  employment  or  termination  of  employment  or any
individual by the Company.  The Company and each ERISA  Affiliate is in material
compliance  with all  Legal  Requirements  governing  the  employment  of labor,
including,  but not  limited  to,  all  such  laws  relating  to  wages,  hours,
collective bargaining, discrimination, civil rights, safety and health, workers'
compensation  and the  collection  and  payment  of  withholding  and/or  Social
Security taxes and similar taxes.

               p.   Intellectual Property.  Except  as  otherwise  set  forth on
Schedule 3(p):

                    (i)  Schedule 3(p) sets forth a true,  correct and  complete
list  and  summary   description   of  all  (A)  Registered  or  material  Owned
Intellectual Property (each identified as a Patent,  Trademark,  Trade Secret or
Copyright,  as the  case may  be),  (B)  material  Technology  Systems,  and (C)
material Intellectual Property Contracts.

                    (ii) All Business Intellectual Property is valid, subsisting
and enforceable. No Owned Intellectual Property has been abandoned,  canceled or
adjudicated  invalid  (excepting any expirations in the ordinary course),  or is
subject to any  outstanding  order,  judgment or decree  restricting  its use or
adversely  affecting or  reflecting  the Company's or the  Subsidiaries'  rights
thereto. To the Company's knowledge,  no Licensed Intellectual Property has been
abandoned,  canceled or adjudicated  invalid  (excepting any  expirations in the
ordinary  course),  or is subject to any outstanding  order,  judgment or decree
restricting  its use or adversely  affecting or reflecting  the Company's or the
Subsidiaries' rights thereto. The Owned Intellectual Property has been used with
all  patent,  trademark,   copyright,   confidential,   proprietary,  and  other
Intellectual  Property  notices  and  legends  prescribed  by law  or  otherwise
permitted.

                    (iii)   No  suit,  action,  reissue,  reexamination,  public
protest, interference, arbitration, mediation, opposition, cancellation or other
proceeding  (collectively,  "Suit") is pending  concerning any claim or position
that the Company or the  Subsidiaries  have violated any  Intellectual  Property
rights.  No claim has been  threatened  or  asserted  against the Company or its
Subsidiaries  or any of their  indemnitees  for  violation  of any  Intellectual
Property rights. The Company and the Subsidiaries are not violating and have not
violated any Intellectual Property rights.

                    (iv) No Suit is pending concerning any Intellectual Property
Contract,  including any Suit concerning a claim or position that the Company or
the  Subsidiaries  or another  Person has  breached  any  Intellectual  Property
Contract or that any Intellectual Property Contract is invalid or unenforceable.

                                     - 17 -



No such claim has been threatened or asserted.  The Company and the Subsidiaries
are in material  compliance  with,  and have  conducted  their business so as to
comply, in all material  respects,  with all terms of all Intellectual  Property
Contracts. There exists no event, condition or occurrence which, with the giving
of notice or lapse of time,  or both,  would  constitute  a  material  breach or
default  by  the  Company  or the  Subsidiaries  or  another  Person  under  any
Intellectual  Property Contract.  Each Person who is a party to any Intellectual
Property Contract had and has all rights, power and authority necessary to enter
into,  be bound by and fully perform such  Intellectual  Property  Contract.  No
party to any  Intellectual  Property  Contract  has  given  the  Company  or the
Subsidiaries  notice of its intention to cancel,  terminate or fail to renew any
Intellectual Property Contract.

                    (v)  No Suit  is pending  concerning  the Owned Intellectual
Property,  including  any Suit  concerning  a claim or  position  that the Owned
Intellectual   Property  has  been   violated  or  is  invalid,   unenforceable,
unpatentable,  unregisterable, cancelable, not owned or not owned exclusively by
the Company or the Subsidiaries.  No such claim has been threatened or asserted.
To the Company's knowledge, no valid basis for any such Suits or claims exists.

                    (vi)   To  the  Company's  knowledge,  no  Suit  is  pending
concerning the Licensed Intellectual  Property,  including any Suit concerning a
claim or position that the Licensed  Intellectual  Property has been violated or
is invalid, unenforceable,  unpatentable,  unregisterable, cancelable, not owned
or not owned exclusively by the licensor of such Intellectual  Property. No Suit
is pending  concerning the right of the Company or the  Subsidiaries  to use the
Licensed  Intellectual  Property,  including  any  Suit  concerning  a claim  or
position  that such right has been  violated or is invalid,  unenforceable,  not
owned or not  owned  exclusively  by the  Company  or the  Subsidiaries.  To the
Company's  knowledge,  no such claims have been  threatened  or asserted  and no
valid basis for any such Suits or claims exists.

                    (vii)   To  the Company's knowledge,  no Person is violating
any Business Intellectual Property.

                    (viii)  The Company  and the Subsidiaries  own or  otherwise
hold valid rights to use all  Intellectual  Property used or  contemplated to be
used in the respective businesses of the Company and the Subsidiaries.  All such
rights are free of all Liens and are fully  assignable  by the  Company  and the
Subsidiaries  to any  Person,  without  payment,  consent of any Person or other
condition or restriction.  The Business  Intellectual  Property  constitutes all
Intellectual  Property  necessary to operate the  respective  businesses  of the
Company and the Subsidiaries as currently conducted or contemplated.

                    (ix)  The Company and the Subsidiaries  have timely made all
filings and payments with the appropriate foreign and domestic agencies required
to maintain in subsistence all Registered Owned  Intellectual  Property.  No due
dates  for  filings  or  payments  concerning  the Owned  Intellectual  Property
(including  without  limitation  office  action  responses,  affidavits  of use,
affidavits  of  continuing  use,  renewals,  requests  for  extension  of  time,
maintenance fees, application fees and foreign convention priority filings) fall
due within ninety (90) days of the Closing  Date,  whether or not such due dates
are  extendable.  The Company and the  Subsidiaries  are in compliance  with all
applicable  rules and  regulations  of such  agencies  with  respect to Business
Intellectual  Property.  All  documentation  necessary to confirm and effect the

                                     - 18 -



Company's and the Subsidiaries'  ownership of Owned  Intellectual  Property,  if
acquired from other  Persons,  has been recorded in the United States Patent and
Trademark Office, the United States Copyright Office and other official offices.

                    (x)   The  Company  and  the  Subsidiaries  have  taken  all
reasonable  measures to protect the  secrecy,  confidentiality  and value of all
Trade Secrets used in their businesses (collectively,  "Business Trade Secrets")
(including   without  limitation   entering  into  appropriate   confidentiality
agreements  with all  officers,  directors,  employees,  and other  Persons with
access to the Business Trade Secrets). To the Company's knowledge,  the Business
Trade  Secrets  have not been  disclosed  to any Persons  other than Company and
Subsidiaries employees or Company and Subsidiaries contractors who had a need to
know and use such Business Trade Secrets in the ordinary course of employment or
contract performance and who executed appropriate confidentiality agreements.

                    (xi)  The Technology Systems  are adequate  in all  material
respects for their intended use and for the operation of such  businesses as are
currently  operated  and as are  currently  contemplated  to be  operated by the
Companies and the Subsidiaries. The Intellectual Property Contracts set forth on
Schedule 3(p) provide the Company and Subsidiaries  with all necessary rights in
connection with the use of the Technology Systems.

                    (xii)  As used in this Agreement, the  following terms shall
have the following meanings:

                         (A)   "Business Intellectual Property"  shall mean  the
Owned Intellectual Property and the Licensed Intellectual Property.

                         (B)   "Intellectual Property"  shall  mean all  foreign
and domestic (i) trademarks,  service marks, brand names,  certification  marks,
collective marks, d/b/a's,  Internet domain names, logos, symbols,  trade dress,
assumed names,  fictitious names,  trade names, and other indicia of origin, all
applications  and  registrations  for all of the  foregoing,  and  all  goodwill
associated  therewith and symbolized  thereby,  including without limitation all
extensions,  modifications  and renewals of same  (collectively,  "Trademarks");
(ii)  inventions,  discoveries  and ideas,  whether  patentable  or not, and all
patents, registrations,  and applications therefor, including without limitation
divisions,  continuations,  continuations-in-part and renewal applications,  and
including without limitation  renewals,  extensions and reissues  (collectively,
"Patents");  (iii) confidential and proprietary  information,  trade secrets and
know-how,  including  without  limitation  processes,   schematics,   databases,
formulae,   drawings,   prototypes,   models,   designs   and   customer   lists
(collectively,  "Trade  Secrets");  (iv)  published  and  unpublished  works  of
authorship,  whether copyrightable or not (including without limitation computer
software),  copyrights  therein and thereto,  and registrations and applications
therefor,  and all renewals,  extensions,  restorations  and reversions  thereof
(collectively,  "Copyrights");  and  (v)  all  other  intellectual  property  or
proprietary  rights and claims or causes of action  arising out of or related to
any infringement,  misappropriation  or other violation of any of the foregoing,
including  without  limitation  rights to recover  for past,  present and future
violations thereof.

                         (C)   "Intellectual  Property  Contracts"  shall   mean
all agreements concerning the Business Intellectual Property,  including without
limitation  agreements  granting the Company and the Subsidiaries  rights to use

                                     - 19 -



the Licensed  Intellectual  Property,  agreements  granting  rights to use Owned
Intellectual  Property,   confidentiality   agreements,   Trademark  coexistence
agreements, Trademark consent agreements and nonassertion agreements.

                         (D)   "Licensed  Intellectual  Property"   shall   mean
Intellectual  Property  that the Company and the  Subsidiaries  are  licensed or
otherwise  permitted by other Persons to use,  including without  limitation all
Intellectual Property related to any Technology Systems owned by third parties.

                         (E)     "Owned  Intellectual  Property"   shall    mean
Intellectual Property owned by the Company and the Subsidiaries.

                         (F) "Registered" shall mean issued, registered, renewed
or the subject of a pending application.

                         (G)  "Technology Systems"  means  the  electronic  data
processing, information, recordkeeping,  communications,  telecommunications and
computer  systems  (including  all computer  programs and  software,  databases,
firmware,  hardware  and  related  documentation)  which are used by the Company
and/or the Subsidiaries in their respective businesses.

               q.  Properties.  (i) The Company and its  Subsidiaries  have good
and marketable title to, valid leasehold interests in, or valid licenses to use,
all  property  and assets of the Company  and its  Subsidiaries  (including  the
property  and  assets  of the  CSD),  free and  clear of all  Liens,  except  as
described on Schedule 3(q) or such as do not materially affect the value of such
property and do not interfere  with the use made and proposed to be made of such
property by the Company and any of its  Subsidiaries.  All such  properties  and
assets are in good working order and condition, ordinary wear and tear excepted.
Schedule 3(q) sets forth a complete and accurate list of the location,  by state
and  street  address,  of all real  property  owned,  licensed  or leased by the
Company and its  Subsidiaries  and identifies  the interest  (fee,  leasehold or
license) of the Company or Subsidiary  therein.  The Company or its Subsidiaries
has valid leasehold  interests in the leases described on Schedule 3(q) to which
it is a party.  True,  complete and correct  copies of each such lease have been
delivered  to each of the Buyers (or its  representatives).  Schedule  3(q) sets
forth with respect to each such lease, the commencement date,  termination date,
renewal  options (if any) and annual  base  rents.  Each such lease is valid and
enforceable in accordance with its terms in all material respects and is in full
force and effect.  To the best  knowledge of the Company,  no other party to any
such lease is in default of its obligations thereunder,  and none of the Company
or any of its  Subsidiaries  (or any other  party to any such  lease) has at any
time delivered or received any notice of default which remains uncured under any
such  lease and no event has  occurred  which,  with the giving of notice or the
passage of time or both, would constitute a default under any such lease.

                    (ii) All Permits material to the Company or its Subsidiaries
required to have been issued to the Company or its Subsidiaries  with respect to
the real  property  owned,  licensed  or  leased  by the  Company  or any of its
Subsidiaries to enable such property to be lawfully occupied and used for all of
the  purposes for which it is currently  occupied and used  (separate  and apart

                                     - 20 -



from any other properties),  have been lawfully issued and are in full force and
effect  and  all  such  real  property   complies  with  all  applicable   Legal
Requirements and Policies covering such properties in all material respects.

                    (iii) Neither the Company  nor any of its  Subsidiaries have
received  any notice,  nor has any  knowledge,  of any  pending,  threatened  or
contemplated condemnation proceeding affecting any real property owned, licensed
or leased by the Company or any Subsidiary.

                    (iv)  No portion  of any  real property owned,  licensed  or
leased by the Company or any of its Subsidiaries has suffered any damage by fire
or other casualty loss which has not  heretofore  been  completely  repaired and
restored to its condition  existing  prior to such  casualty.  No portion of any
improvements  (other than paving,  parking and landscaped areas)  constructed on
any of the real property owned,  licensed or leased by the Company or any of its
Subsidiaries  is located in a special  flood  hazard area as  designated  by any
Governmental Authority.

               r.  Environmental Laws.  Except  as set forth  on  Schedule 3(r),

                    (i)   The  Company's  and   its  Subsidiaries'   businesses,
Facilities (as defined in the Financing Agreement),  operations,  properties and
assets are in material compliance with Environmental Laws.

                    (ii)  The Company and its Subsidiaries have obtained and are
in material  compliance  with all material  Environmental  Permits  necessary to
operate,  use or occupy all of the Company's and its  Subsidiaries'  businesses,
facilities,  operations, properties and assets, except for Environmental Permits
relating to the SK Facilities (as defined in the Financing  Agreement) which are
not yet effective but for which requisite applications have been filed.

                    (iii) Except as provided in Section 6.01(r) of the Financing
Agreement,  the  Company  and its  Subsidiaries  have  obtained  and are in full
compliance with all financial assurance  requirements under RCRA and any similar
Environmental  Law, as specifically  set forth but not limited to 40 C.F.R.  264
and 265,  necessary  to  operate,  use or occupy  all of the  Company's  and its
Subsidiaries' businesses, facilities, operations, properties and assets.

                    (iv)  The  Company  and  its  Subsidiaries  are  in material
compliance with all applicable  writs,  orders,  consent decrees,  judgments and
injunctions by any Governmental  Authority,  decrees,  informational requests or
demands issued pursuant to, or arising under, any Environmental Laws.

                    (v) The Company's and its Subsidiaries' will not be required
to spend more than  $1,000,000  in the  aggregate for any Facility or $5,000,000
for all  Facilities  to  comply  with any  Environmental  Laws  that  have  been
promulgated and enacted by a Governmental  Authority,  but will not be effective
until after the date of this Agreement or the Closing Date, except to the extent
those  expenditures  are  already  specifically  included  within the  aggregate
amounts  described  in clause (x) or (xi) below or in the  capital  expenditures
described in Section 7.02(g) of the Financing Agreement.

                                     - 21 -



                    (vi) Except for Releases for which the related Environmental
Liabilities are specifically  included within the aggregate amounts described in
clauses  (ix)  through  (xi)  below,  there  has been no  Release  at any of the
facilities,  assets  or  properties  owned  or  operated  by  the  Company,  its
Subsidiaries  or,  to the  knowledge  of the  Company  and its  Subsidiaries,  a
predecessor in interest.

                    (vii)  Except for Environmental Claims specifically included
within  the  aggregate  amounts  described  in clauses  (ix)  through  (xi),  no
Environmental  Claims  have been  asserted  against  any  treatment,  storage or
disposal facility that received or Handled Hazardous  Materials generated by the
Company,  its Subsidiaries or any predecessor in interest which could reasonably
be expected to result in any  Environmental  Liabilities in excess of $1,000,000
for any Facility or $5,000,000 in the aggregate for all Facilities.

                    (viii) Except for Environmental Claims specifically included
within the aggregate  amounts  described in clauses (ix) through (xi) below,  no
Environmental  Claims have been asserted  against the Company,  its Subsidiaries
or, to the knowledge of the Company and its  Subsidiaries,  any  predecessor  in
interest nor does the Company or its  Subsidiaries  have  knowledge or notice of
any  threatened  or  pending  Environmental  Claims  against  the  Company,  its
Subsidiaries or any  predecessor in interest which could  reasonably be expected
to result in any Environmental  Liabilities in excess of $1,000,000 individually
or $5,000,000 in the aggregate.

                    (ix) The  Company and its  Subsidiaries  will not assume any
Environmental  Liabilities  related to the acquisition of CSD that are more than
ten percent above $265,000,000, calculated in accordance with GAAP.

                    (x) Excluding any Environmental  Liabilities  related to the
CSD Acquisition  assumed by the Company and its Subsidiaries,  the Company's and
its  Subsidiaries  will not spend more than ten percent  above  $29,250,000  for
closure,  post closure and post closure care of the CH Facilities (as defined in
the  Financing  Agreement),  as those  terms  are  used in RCRA and any  similar
Environmental  Law, as specifically  set forth but not limited to 40 C.F.R.  264
and 265.

                    (xi) Excluding any Environmental  Liabilities of CSD assumed
by the Company and its  Subsidiaries,  to the knowledge of the Company's and its
Subsidiaries,  there are no Remedial  Actions that will cost, in the  aggregate,
more than $1,000,000 per calendar year for the foreseeable future.

                    (xii)  All  representations,  including  without  limitation
applications, warranty statements and accompanying materials provided in support
of such representations,  provided by the Company and its Subsidiaries to obtain
any Policies, are truthful and complete in all respects, and the Company and its
Subsidiaries  have done nothing to prejudice  it's rights to obtain the benefits
of it's Policies by failing to comply with any of the provisions,  conditions or
requirements of its Polices.

                    (xiii) there are no  Environmental  Liens  associated or, to
the best knowledge of the Company,  threatened to be associated  with any of the

                                     - 22 -



CSD Acquisition Assets or the Company's or any of its Subsidiaries'  businesses,
Facilities, operations, properties and assets.

                    (xiv) except for work,  repairs,  contributions  and Capital
Expenditures (as defined in the Financing  Agreement)  specifically  included in
the  aggregate  amounts set forth in clauses  (ix) through (xi) above or Section
7.02(g) of the Financing Agreement, to the best knowledge of the Company, (A) no
work, repairs, construction or Capital Expenditures are required to be made as a
condition of continued  compliance of the  Facilities or the Company's or any of
its  Subsidiaries'  business  with  any  Environmental  Laws,  or  any  license,
Environmental  Permit or  approval  issued  pursuant  thereto or (B) no license,
Environmental Permit or approval referred to above is about to be reviewed, made
subject to limitations or conditions, revoked, withdrawn or terminated.

                    (xv) As used in this  Agreement,  the following  terms shall
have the following meanings:

                         (A)  "Environmental Claims"  refers  to  any complaint,
summons, citation, notice, directive,  order, claim, litigation,  investigation,
notice of violation, judicial or administrative proceeding,  judgment, letter or
other  communication  from  any  Governmental  Authority,  or  any  third  party
involving  violations of Environmental  Laws, Handling of Hazardous Materials or
Releases of Hazardous Materials from (i) any assets, properties or businesses of
the Company or any  predecessor in interest;  (ii) from adjoining  properties or
businesses;  or  (iii)  from or onto any  facilities  which  received  Hazardous
Materials  generated  or  Handled  by  the  Company,  its  Subsidiaries  or  any
predecessor in interest.

                        (B)   "Environmental Laws"  includes  the  Comprehensive
Environmental  Response,  Compensation  and Liability Act ("CERCLA"),  42 U.S.C.
9601 et seq., as amended;  the Resource  Conservation and Recovery Act ("RCRA"),
42 U.S.C. 6901 et seq., as amended; the Clean Air Act ("CAA"), 42 U.S.C. 7401 et
seq.,  as  amended;  the Clean Water Act  ("CWA"),  33 U.S.C.  1251 et seq.,  as
amended; the Occupational Safety and Health Act ("OSHA"), 29 U.S.C. 655 et seq.,
as amended;  Toxic Substances Control Act ("TOSCA"),  15 U.S.C. 2601 et seq., as
amended;  Hazardous  Materials  Transportation  Act, 49 U.S.C.  5101 et seq., as
amended; the Federal Insecticide,  Fungicide,  and Rodenticide Act ("FIFRA"),  7
U.S.C.  136-136y et seq.,  as amended;  the  Emergency  Planning  and  Community
Right-to-Know  Act of 1986 (Title III of SARA or "EPCRA");  42 U.S.C.  11001, et
seq., as amended,  and any other  foreign,  federal,  state,  local or municipal
laws, statutes,  regulations,  guidance documents,  rules or ordinances imposing
liability  or  establishing  standards  of conduct  for  Handling  of  Hazardous
Materials and the protection of the health, safety and the environment.

                        (C)  "Environmental Lien" means any Lien in favor of any
Governmental Authority for Environmental Liabilities.

                        (D)  "Environmental  Liabilities"  means  any   monetary
obligations, losses, liabilities (including strict liability), damages, punitive
damages,  consequential  damages,  treble damages, costs and expenses (including
all  reasonable  out-of-pocket  fees,  disbursements  and  expenses  of counsel,
out-of-pocket   expert  and  consulting   fees  and   out-of-pocket   costs  for
environmental site assessments, remedial investigation and feasibility studies),

                                     - 23 -



fines,   penalties,   sanctions  and  interest  incurred  as  a  result  of  any
Environmental  Claim filed by any  Governmental  Authority,  Person or any third
party  which  relate  to  the  CSD  Acquisition  Assets  or  any  violations  of
Environmental Laws, Handling of Hazardous Materials,  Remedial Actions, Releases
or  threatened  Releases of  Hazardous  Materials  from or onto (i) any property
presently or formerly owned by the  Corporation or any of its  Subsidiaries or a
predecessor in interest,  or (ii) any facility that received Hazardous Materials
that were  generated or Handled by the Company or any of its  Subsidiaries  or a
predecessor in interest.

                        (E) "Environmental Permits" means any permits, licenses,
certificates, exemptions, authorizations, registrations or approvals required by
any Governmental Authority or under Environmental Laws.

                        (F)   "Governmental Authority"   means  any   nation  or
government, any foreign, federal, state, city, town, municipality, county, local
or  other  political   subdivision   thereof  or  thereto  and  any  department,
commission,    board,    bureau,    instrumentality,    agency,    organization,
self-regulatory  authority or other entity  exercising  executive,  legislative,
judicial,  taxing,  regulatory  or  administrative  powers  or  functions  of or
pertaining to government.

                        (G)   "Handle"   means   any   manner   of   generating,
accumulating,  storing,  treating,  disposing  of,  transporting,  transferring,
labeling, handling,  manufacturing or using, as any of such terms may further be
defined in any Environmental Law, of any Hazardous Materials.

                        (H) "Hazardous Materials"- shall include, without regard
to amount and/or  concentration (i) any element,  compound,  or chemical that is
defined,  listed or otherwise  classified  as a  contaminant,  pollutant,  toxic
pollutant,  toxic or  hazardous  substances,  extremely  hazardous  substance or
chemical under Environmental Laws; (ii) any wastes regulated, defined, listed or
otherwise  classified  by  Environmental  Laws,  including  but not  limited  to
hazardous  waste,   agricultural   wastes,   biological  waste,  medical  waste,
biohazardous or infectious waste, special waste,  recyclable materials,  sludge,
used oils,  construction and demolition debris and solid waste; (iii) petroleum,
petroleum-based or petroleum-derived  products; (iv) polychlorinated  biphenyls;
(v) any substance exhibiting a hazardous waste characteristic  including but not
limited to  corrosivity,  ignitibility,  toxicity or  reactivity  as well as any
radioactive  or  explosive  materials;  and  (vi)  any raw  materials,  building
components,  including  but not  limited to  asbestos-containing  materials  and
manufactured products containing Hazardous Materials.

                        (I)   "Release"  means  any spilling,  leaking, pumping,
emitting,  emptying,  discharging,  injecting,  escaping,  leaching,  migrating,
dumping,  or disposing of Hazardous  Materials  (including  the  abandonment  or
discarding  of  barrels,  containers  or  other  closed  receptacles  containing
Hazardous Materials) into the environment.

                        (J)  "Remedial Action"  means  all actions  taken to (i)
clean up, remove, remediate, contain, treat, monitor, assess, evaluate or in any
other way address Hazardous Materials in the indoor or outdoor environment; (ii)
prevent or minimize a Release or  threatened  Release of Hazardous  Materials so
they do not migrate or endanger or threaten to endanger public health or welfare
or the indoor or outdoor  environment;  (iii) perform  pre-remedial  studies and

                                     - 24 -



investigations and post-remedial operation and maintenance  activities;  or (iv)
any other actions authorized by 42 U.S.C. 9601.

               s.  Insurance.  Schedule 3(s) contains a list of all Policies and
sets forth,  with respect to each such Policy, a description of the insured loss
coverage,  the expiration date and time of coverage,  the dollar  limitations of
coverage,  and a general description of each deductible feature. For purposes of
this Section 3(s), the term "Policies" means all insurance  policies,  bonds and
guarantees  (including,  without limitation,  all performance and warranty bonds
required under outstanding  contracts or purchase orders and otherwise  required
pursuant to all Legal  Requirements) and self insurance  arrangements that cover
or  purport  to cover  risks  or  losses  to or  associated  with the  business,
operations,  premises,  properties,  assets,  employees,  agents  and  directors
(including,  without  limitation,  those  arising with respect to  environmental
matters)  to which the  Company or any of its  Subsidiaries  (including  the CSD
Business) is a party, a named insured or a beneficiary  thereof. The Company and
its Subsidiaries  maintain  Policies (the "Required  Policies") with financially
sound and reputable  insurance  companies  against  risks of liability,  product
liability,  environmental  liability,  casualty and fire, theft and other losses
and  liabilities as required by any Legal  Requirements  and as are  customarily
obtained  to cover  comparable  businesses  and  assets  in  amounts,  scope and
coverage  which are  consistent  with  industry  practice  and  adequate for the
Company and its Subsidiaries (including the CSD Business). The Required Policies
are  in  full  force  and  effect,  and  neither  the  Company  nor  any  of its
Subsidiaries  is in material  default under any of them.  Except as set forth on
Schedule 3(s),  neither the Company nor any of its Subsidiaries has received any
notice of cancellation or intent to cancel or increase the premiums with respect
to any of the Policies,  nor, to the Company's knowledge, is there any basis for
such action.  None of the Company,  any of its Subsidiaries or, to the Company's
knowledge,  the CSD Business, has incurred any material loss, damage, expense or
liability  covered by any Required  Policy for which it has not asserted a claim
under such Required  Policy.  Except as set forth on Schedule 3(s),  none of the
Company,  any of its  Subsidiaries  or,  to the  Company's  knowledge,  the  CSD
Business,  has been refused any bonds,  financial  assurance  or insurance  with
respect to their  respective  assets or  properties,  nor has its coverage  been
limited  below  usual and  customary  limits by any bonding  company,  financial
guarantor or insurance  provider or with which it has carried  insurance  during
the  last  three  years,  except  where  such  Person  has been  able to  obtain
substitute  bonds,  guarantees or insurance,  as applicable,  providing  similar
coverage at comparable costs, premiums and deductibles.

               t.  Regulatory Permits.  Each of the Company and its Subsidiaries
has,  and  is  in  compliance  with,  all  permits,  licenses,   authorizations,
approvals,  entitlements and accreditations  (collectively,  "Permits") required
for the Company and its Subsidiaries  lawfully to own, lease, manage or operate,
or to acquire, each business currently owned, leased, managed or operated, or to
be acquired,  by such Person,  except for certain Environmental Permits relating
to the  SK  Facilities  (as  defined  in  the  Financing  Agreement)  for  which
applications  have been filed on or prior the  Effective  Date but which are not
yet effective as described in Section 6.01(r) of the Financing Agreement. Except
as set forth in Section 6.01(r) of the Financing Agreement,  no condition exists
or event has occurred  which, in itself or with the giving of notice or lapse of
time or both, would result in the suspension, revocation, impairment, forfeiture
or non-renewal of any such permit, license, authorization, approval, entitlement
or  accreditation,  and there is no claim that any  thereof is not in full force
and effect.  Schedule  3(t)  contains a true,  complete  and correct list of all

                                     - 25 -



material  Permits of the Company  and its  Subsidiaries  indicating  thereon the
expiration date of each such Permit. To the Company's  knowledge,  each material
Permit of the Company and its Subsidiaries that is scheduled to expire within 24
months of the Closing Date will be  renewable  by the Company or the  applicable
Subsidiary  without  undue  cost or expense  to the  Company  or the  applicable
Subsidiary.

               u.  Internal Accounting Controls. Except as set forth on Schedule
3(u),  the  Company and each of its  Subsidiaries  maintain a system of internal
accounting  controls  sufficient  to  provide  reasonable   assurance  that  (i)
transactions  are executed in accordance with  management's  general or specific
authorizations,   (ii)   transactions   are  recorded  as  necessary  to  permit
preparation  of financial  statements  in  conformity  with  generally  accepted
accounting  principles  and to maintain  asset  accountability,  (iii) access to
assets is permitted  only in accordance  with  management's  general or specific
authorization and (iv) the recorded  accountability  for assets is compared with
the existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

               v.    Unconditional  Obligation.  The  Company  understands   and
acknowledges  that the number of Conversion  Shares  issuable upon conversion of
the Preferred Shares will increase in certain circumstances. The Company further
acknowledges  that  its  obligation  to  issue  shares  upon  conversion  of the
Preferred  Shares in accordance  with this Agreement and Certificate is, in each
case,  absolute and unconditional  (except to the extent set forth in Section 11
of the  Certificate)  regardless  of the dilutive  effect that such issuance may
have on the ownership interests of other stockholders of the Company.

               w.  No Materially Adverse Contracts, Etc. Neither the Company nor
any of its  Subsidiaries  is subject to any  charter,  corporate  or other legal
restriction,  or any judgment,  decree,  order,  rule or regulation which in the
judgment of the  Company's  officers  has or is expected in the future to have a
Material  Adverse Effect.  Neither the Company nor any of its  Subsidiaries is a
party to any  contract  or  agreement  which in the  judgment  of the  Company's
officers has or is expected to have a Material Adverse Effect.

               x.  Customers and Suppliers. There exists no actual or threatened
termination, cancellation or limitation of, or modification to or change in, the
business relationship between (i) any of the Company or any of its Subsidiaries,
on the one hand, and any customer or any group thereof, on the other hand, whose
agreements with any of the Company or any of its  Subsidiaries  are individually
or in the aggregate material to the business or operations of the Company and/or
any of its Subsidiaries,  or (ii) any of the Company or any of its Subsidiaries,
on the one hand, and any material supplier thereof, on the other hand; and there
exists no  present  state of facts or  circumstances  that could give rise to or
result in any such termination, cancellation, limitation, modification or change
(including without limitation, the transactions contemplated hereby, pursuant to
the Financing  Agreement,  the Congress Loan or the CSD  Acquisition).  Schedule
3(x)  lists the top fifty  customers  that are  common  to the  Company  and its
Subsidiaries  (before  giving effect to the CSD  Acquisition)  showing the total
revenues received during the most recently  completed fiscal year by the Company
and its Subsidiaries  (before giving effect to the CSD Acquisition),  on the one
hand,  and CSD,  on the other  hand.  The  Company  is not aware of any facts or
circumstances  that might give rise to a material  reduction or loss of business

                                     - 26 -



for  the  Company  and  its  Subsidiaries   (after  giving  effect  to  the  CSD
Acquisition)  from any customers  listed on Schedule 3(x) as a result of the CSD
Acquisition or otherwise.

               y.  Tax Status.  The Company and each of its Subsidiaries (i) has
made or filed all federal,  foreign,  state,  local and municipal income and all
other tax returns,  reports and  declarations  required by any  jurisdiction  to
which it is subject  (unless and only to the extent that the Company and each of
its Subsidiaries has set aside on its books provisions  reasonably  adequate for
the  payment of all unpaid and  unreported  taxes),  (ii) has paid all taxes and
other governmental assessments and charges that are material in amount, shown or
determined to be due on such  returns,  reports and  declarations,  except those
being  contested  in good faith and for which the Company  has made  appropriate
reserves  for on its  books,  and (iii)  has set  aside on its books  provisions
reasonably  adequate for the payment of all taxes for periods  subsequent to the
periods to which such returns,  reports or  declarations  (referred to in clause
(i) above) apply. There are no unpaid taxes in any material amount claimed to be
due by the taxing  authority of any  jurisdiction,  and the Company  knows of no
basis for any such claim.

               z.  Transactions With Affiliates. Except as set forth on Schedule
3(z), and other than the grant of stock options described on Schedule 3(c), none
of the  officers,  directors,  stockholders  or  employees of the Company or any
Subsidiary,  any Person controlling,  controlled by or under common control with
the Company,  is presently a party to any transaction with the Company or any of
its  Subsidiaries,  including  any  contract,  agreement  or  other  arrangement
providing for the furnishing of services to or by,  providing for rental of real
or personal property to or from, or otherwise  requiring payments to or from any
such  officer,  director or employee or, to the  knowledge  of the Company,  any
corporation,  partnership,  trust or other  entity  in which  any such  officer,
director,  or employee has a  substantial  interest or is an officer,  director,
trustee or partner.

               aa.  Application of Takeover Protections.  The  Company  and  its
board of directors have taken all necessary  action,  if any, in order to render
inapplicable any control share acquisition,  business  combination,  poison pill
(including  any  distribution  under a  rights  agreement),  including,  without
limitation,  pursuant to any  shareholder  rights plan or similar  agreement  or
instrument  or other  similar  anti-takeover  provision  under the  Articles  of
Organization  or the laws of the  state of its  incorporation  which is or could
become applicable to the Buyers as a result of the transactions  contemplated by
this Agreement,  including,  without  limitation,  the Company's issuance of the
Securities and the Buyers' ownership of the Securities.

               bb.   Shareholder's Rights Plan.   The Company  has not adopted a
shareholder  rights plan or similar  arrangement  relating to  accumulations  of
beneficial ownership of Common Stock or a change in control of the Company.

               cc.  CSD Acquisition Documents.  (i) (A)  The  Company  and  each
Subsidiary  (before giving effect to the CSD Acquisition),  and to the Company's
knowledge,  each other  party to the  Acquisition  Agreement  governing  the CSD
Acquisition,  each bill of sale,  each  assignment  agreement,  each  assumption
agreement and all other  agreements,  instruments and documents  entered into or
delivered in connection with the CSD Acquisition (including,  without limitation
the final executed versions of each agreement  attached as an exhibit to the CSD
acquisition  agreement,  each  as  amended,  modified  and  supplement  to  date

                                     - 27 -



(collectively, the "CSD Acquisition Documents"), is not in default on any of its
obligations under such CSD Acquisition  Document,  (B) all  representations  and
warranties  made by the  Company  in the CSD  Acquisition  Documents  and in the
certificates  delivered  in  connection  therewith  are true and  correct in all
material  respects  as of the date  hereof  and,  to the best  knowledge  of the
Company,  all material  representations  and warranties  made in the Acquisition
Documents by or on behalf of the sellers thereunder,  or any other party thereto
other than the Company,  are true and correct in all material respects as of the
date hereof, (C) all written information with respect to the Company and the CSD
Acquisition,  and, to the best knowledge of the Company, the business and all of
the property and assets  (tangible and intangible)  sold,  assigned or otherwise
transferred to, or assumed or otherwise  acquired by, the Company and certain of
its  Subsidiaries  pursuant to the Acquisition  Documents (the "CSD  Acquisition
Assets"),  furnished  to the Buyers by the Company or on behalf of the  Company,
were,  at the time the same  were so  furnished,  complete  and  correct  in all
material  respects,  or have been  subsequently  supplemented  by other  written
information,  to the extent  necessary  to give each  Buyer a true and  accurate
knowledge of the subject matter of each of them in relation to the Company,  its
Subsidiaries,  the CSD  Acquisition,  the CSD Business  and the CSD  Acquisition
Assets  acquired  in  connection  with  the  CSD  Acquisition,  in all  material
respects,  (D) no representation,  warranty or statement made by the Company or,
to its best  knowledge,  the sellers or any other party  thereto  other than the
Company,  at the time  they were made in any CSD  Acquisition  Document,  or any
agreement, certificate,  statement or document required to be delivered pursuant
to any CSD Acquisition  Document  contains any untrue statement of material fact
or omits to state a  material  fact  necessary  in order to make the  statements
contained  in such CSD  Acquisition  Documents  not  misleading  in light of the
circumstances  in which  they  were  made,  and (E) in  connection  with the CSD
Acquisition,  the Company and certain of its  Subsidiaries are acquiring the CSD
Acquisition  Assets  and,  on  the  date  hereof,  after  giving  effect  to the
transactions  contemplated by this Agreement and the Financing Agreement, by the
CSD Acquisition  Documents,  and the Sale Order (as defined  herein),  will have
good title to such CSD Acquisition Assets free and clear of all Liens other than
the Liens created by the Financing  Agreement and the agreements and instruments
entered  into in  connection  therewith  and other than Liens  permitted by such
documents.

                    (ii)  The Company (or its representatives) has delivered  to
each  Buyer a  complete  and  correct  copy of the  CSD  Acquisition  Documents,
including all schedules and exhibits  thereto and the Sale Order as currently in
effect,  (B) each CSD Acquisition  Document sets forth the entire  agreement and
understanding of the parties thereto relating to the subject matter thereof, and
there are no other agreements, arrangements or understandings,  written or oral,
relating  to the  matters  covered  thereby,  (C)  none of the  CSD  Acquisition
Documents nor the Sale Order has been amended or otherwise  modified without the
prior written consent of the Buyers, (D) the execution, delivery and performance
of the CSD  Acquisition  Documents  have been duly  authorized  by all necessary
action on the part of each such person or entity,  (E) the CSD  Acquisition  has
been effected in accordance  with the terms of the Sale Order,  the  Acquisition
Documents and all  applicable law  (including,  without  limitation,  the United
States Bankruptcy Code (11 U.S.C. ss. 101, et seq.) (the "Bankruptcy  Code"), as
amended, and any successor statute),  (F) at the time of consummation of the CSD
Acquisition,  there does not exist any judgment, order or injunction prohibiting
or imposing any material  adverse  condition  upon the  consummation  of the CSD
Acquisition, (G) at the time of consummation thereof, all consents and approvals
of, and filings and registrations with, and all other actions in respect of, all

                                     - 28 -



Legal  Requirements  required in order to consummate the CSD  Acquisition  shall
have been obtained, given, filed or taken and shall be in full force and effect,
(viii) all actions taken by the Company and its  Subsidiaries  pursuant to or in
furtherance of the CSD Acquisition have been taken in compliance in all material
respects with respective Acquisition Documents, the Bankruptcy Code and the Sale
Order,  (ix) the  Company  and its  Subsidiaries  did not  incur or  assume  any
liabilities or obligations pursuant to or in connection with the CSD Acquisition
other than those  liabilities and  obligations set forth on Schedule  3(cc)(ii),
and (x) each Acquisition  Document is the legal, valid and binding obligation of
the parties  thereto,  enforceable  against such parties in accordance  with its
terms.

               dd.  Investment Company Status.  The  Company is  not,  and  upon
consummation  of the sale of the  Securities  and after giving effect to the CSD
Acquisition,  will not be, an "investment  company," a company  controlled by an
"investment  company" or an "affiliated  person" of, or "promoter" or "principal
underwriter"  for,  an  "investment  company"  as such terms are  defined in the
Investment Company Act of 1940, as amended.

               ee. Foreign Corrupt Practices. Neither the Company nor any of its
Subsidiaries,  nor any director, officer, agent, employee or other person acting
on behalf of the  Company or any  Subsidiary  has,  in the course of his actions
for, or on behalf of, the Company or any Subsidiary used any corporate funds for
any  unlawful  contribution,  gift,  entertainment  or other  unlawful  expenses
relating to political activity;  made any direct or indirect unlawful payment to
any foreign or domestic  government  official or employee from corporate  funds;
violated  or is in  violation  of any  provision  of the  U.S.  Foreign  Corrupt
Practices Act of 1977; or made any bribe,  rebate,  payoff,  influence  payment,
kickback  or other  unlawful  payment  to any  foreign  or  domestic  government
official or employee.

               ff.   Solvency.  The Company individually  and together  with its
Subsidiaries on a consolidated basis (both before and after giving effect to the
CSD Acquisition,  the transactions contemplated by this Agreement, the Financing
Agreement and the Congress Loan  Documents) is solvent (i.e.,  its assets have a
fair  market  value  in  excess  of the  amount  required  to pay  its  probable
liabilities  on its  existing  debts as they become  absolute  and  matured) and
currently  the  Company  has no  information  that would  lead it to  reasonably
conclude that the Company would not have,  nor does it intend to take any action
that would  impair,  its ability to pay its debts from time to time  incurred in
connection therewith as such debts mature.

               gg.   Broker's or Finder's  Commissions.  Except  as set forth on
Schedule  3(gg), no broker's or finder's fee or commission will be payable by or
on behalf of the Company or any of its Subsidiaries with respect to the issuance
and sale of the Securities.

          4.   COVENANTS.

               a.  Reasonable Best Efforts.  Each party shall use its reasonable
best efforts to timely  satisfy each of the  conditions to be satisfied by it as
provided in Sections 6 and 7 of this Agreement.

               b.   Use of Proceeds.  The Company will use the proceeds from the
sale of the Preferred Shares as described with particularity on Schedule 4(b).

                                     - 29 -



               c.    Financial Information.

                    (i) So long as any of the Securities remain outstanding, the
Company will provide the following information to each Buyer:

                    (A)  as soon as practicable  and in any event within 45 days
after the end of each quarterly period (other than the last quarterly period) in
each fiscal year,  consolidated  statements of operations,  stockholders' equity
and cash flows of the  Company  and its  Subsidiaries  for the  period  from the
beginning of the current fiscal year to the end of such quarterly period,  and a
consolidated  balance sheet of the Company and its Subsidiaries as at the end of
such quarterly  period,  setting forth in each case in comparative  form figures
for the corresponding  period in the preceding fiscal year, and certified by the
Chief  Financial  Officer of the  Company,  subject to  changes  resulting  from
year-end adjustments;

                    (B)  as soon as practicable  and in any event within 90 days
after  the end of each  fiscal  year,  consolidated  statements  of  operations,
stockholders' equity and cash flows of the Company and its Subsidiaries for such
year, and the consolidated  balance sheet of the Company and its Subsidiaries as
at the  end of such  year,  setting  forth  in each  case  in  comparative  form
corresponding consolidated figures from the preceding annual audit and certified
to the Company by independent public accountants of recognized national standing
selected by the Company;

                    (C)  promptly after their becoming available, copies of  all
registration statements and reports which the Company or any of its Subsidiaries
shall have filed with the SEC or any national  securities  exchange or quotation
system;

                    (D)  promptly after  the mailing  thereof to  the holders of
Common Stock of the Company,  copies of all  financial  statements,  reports and
proxy statements so mailed;

                    (E)  promptly after their  becoming available, copies of all
reports and  compliance  certificates  filed in  connection  with the  Financing
Agreements and the Congress Facility; and

                    (F)  true, complete  and correct  copies of  all  documents,
reports,  financial  data and other  information  that each Buyer may reasonably
request.

                    (ii) The Company shall permit the authorized representatives
designated  by each  Buyer to visit and  inspect  any of the  properties  of the
Company or any of its  Subsidiaries,  including  their books of account,  and to
discuss their affairs,  finances and accounts with their  officers,  all at such
times as each Buyer may reasonably request.

                    (iii)  Each Buyer shall have  the right to consult  with and
advise the  management  of the Company  and its  subsidiaries,  upon  reasonable
notice at  reasonable  times from time to time,  on all matters  relating to the
operation of the Company and its Subsidiaries.

                    d.  Reservation of Shares. The Company shall take all action
necessary  to at all times have  authorized,  and  reserved  for the  purpose of

                                     - 30 -



issuance of shares of Common  Stock  needed to provide  for the  issuance of the
Conversion  Shares issuable upon conversion of all outstanding  Preferred Shares
(without  regard to any limitations on conversions) in accordance with the terms
of the Certificate.

                e.  Listing.  The Company shall  promptly secure  the listing of
all of the Registrable Securities (as defined in the Investors Rights Agreement)
upon each national  securities  exchange and automated quotation system, if any,
upon which shares of Common Stock are then listed (subject to official notice of
issuance) and shall maintain,  so long as any other shares of Common Stock shall
be so listed,  such  listing  of all  Registrable  Securities  from time to time
issuable under the terms of the Transaction  Documents and the  Certificate.  So
long as any  Securities are  outstanding,  the Company shall maintain the Common
Stock's authorization for quotation on the Nasdaq National Market or for listing
on the New York Stock Exchange (as applicable,  the "Principal Market"). So long
as any  Preferred  Shares  are  outstanding  and other than in  connection  with
Organic  Changes  (as  defined  in the  Certificate)  that  have  been  properly
authorized  by  the  holders  of  Preferred   Shares  in  accordance   with  the
Certificate,  neither  the Company  nor any of its  Subsidiaries  shall take any
action  which  would be  reasonably  expected  to  result  in the  delisting  or
suspension of the Common Stock from the Principal Market.  The Company shall pay
all fees and expenses in connection with  satisfying its obligations  under this
Section 4(f).

                f.  Proxy Statement.  The Company shall provide each stockholder
entitled  to vote at the next  meeting of  stockholders  of the  Company,  which
meeting  shall  occur on or before  April 30,  2003 and the record date for such
meeting shall be  established  by the Company's  Board of Directors on or before
March 15, 2003; a proxy statement,  together with a form of proxies,  which have
been previously approved by the Buyers and a counsel of their choice, soliciting
each  such  stockholder's  affirmative  vote at  such  stockholder  meeting  for
approval  for the  issuance  of a number of  Conversion  Shares  greater  in the
aggregate  than  19.99% of the  number of  shares  of Common  Stock  outstanding
immediately  prior to the Closing Date pursuant to applicable  law, the rules of
the NASD and any other  rules and  regulations  of the  Principal  Market  (such
affirmative  approval being referred to herein as the  "Stockholder  Approval"),
and the Company  shall use its best efforts to solicit  proxies to vote in favor
of such issuance and to cause the Board of Directors of the Company to recommend
to the stockholders that they approve such proposal.

                g.   Compliance with Law. The Company shall, and shall cause its
Subsidiaries,  to comply in all  material  respects  with all  applicable  Legal
Requirements (including, without limitation, all Environmental Laws).

          5.  TRANSFER AGENT INSTRUCTIONS.

          The  Company  shall issue  irrevocable  instructions  to its  transfer
agent, and any subsequent transfer agent, to issue certificates or credit shares
to the  applicable  balance  accounts at the Depository  Trust Company  ("DTC"),
registered  in the name of each  Buyer  or its  respective  nominee(s),  for the
Conversion  Shares in such amounts as specified  from time to time by each Buyer
to the  Company  upon  conversion  of the  Preferred  Shares  (the  "Irrevocable
Transfer Agent Instructions"),  a form of which is attached as Exhibit D hereto.

                                     - 31 -



Prior to  registration  of the  Conversion  Shares  under the 1933 Act, all such
certificates shall bear the restrictive legend specified in Section 2(g) of this
Agreement.  The Company warrants that no instruction  other than the Irrevocable
Transfer  Agent  Instructions  referred to in this  Section 5 and stop  transfer
instructions  to  give  effect  to  Section  2(f)  hereof  (in  the  case of the
Conversion Shares, prior to registration of the Conversion Shares under the 1933
Act) will be given by the Company to its transfer  agent and that the Securities
shall  otherwise be freely  transferable on the books and records of the Company
as and to the  extent  provided  in  this  Agreement,  the  Certificate  and the
Investors Rights  Agreement.  If a Buyer provides the Company with an opinion of
counsel,  in a form reasonably  acceptable to the Company,  to the effect that a
public  sale,   assignment  or  transfer  of  Securities  may  be  made  without
registration  under  the  1933  Act or  the  Buyer  provides  the  Company  with
reasonable  assurances  that the  Securities  can be sold  pursuant  to Rule 144
without  any  restriction  as to  the  number  of  securities  acquired  as of a
particular date that can then be immediately  sold, the Company shall permit the
transfer,  and, in the case of the  Conversion  Shares,  promptly  instruct  its
transfer  agent to issue one or more  certificates,  or credit  shares to one or
more  balance  accounts  at DTC,  in such  name  and in  such  denominations  as
specified  by such  Buyer  and  without  any  restrictive  legend.  The  Company
acknowledges  that  a  breach  by it of its  obligations  hereunder  will  cause
irreparable  harm to the  Buyers by  vitiating  the  intent  and  purpose of the
transaction contemplated hereby. Accordingly,  the Company acknowledges that the
remedy  at law for a breach  of its  obligations  under  this  Section 5 will be
inadequate  and  agrees,  in the event of a breach or  threatened  breach by the
Company of the  provisions of this Section 5, that the Buyers shall be entitled,
in addition  to all other  available  remedies,  to an order  and/or  injunction
restraining any breach and requiring  immediate  issuance and transfer,  without
the necessity of showing  economic  loss and without any bond or other  security
being required.

          6.    CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL.

          The  obligation of the Company to issue and sell the Preferred  Shares
to each Buyer at the  Closing is subject to the  satisfaction,  at or before the
Closing  Date,  of  each  of  the  following  conditions,  provided  that  these
conditions  are for the Company's  sole benefit and may be waived by the Company
at any time in its sole  discretion  by providing  each Buyer with prior written
notice thereof:

               a.   Such  Buyer shall  have  executed  each of  the  Transaction
Documents to which it is a party and delivered the same to the Company.

               b.  Such Buyer shall have  delivered to the  Company the Purchase
Price for the Preferred  Shares being  purchased by such Buyer at the Closing by
wire transfer of immediately  available funds pursuant to the wire  instructions
provided by the Company at least two (2) Business Days prior to the Closing.

               c. The representations and warranties of such Buyer shall be true
and  correct  in all  material  respects  as of the date when made and as of the
Closing  Date as  though  made at that  time  (except  for  representations  and
warranties  that  speak as of a  specific  date),  and  such  Buyer  shall  have
performed,  satisfied and complied in all material  respects with the covenants,
agreements and conditions required by the Transaction Documents to be performed,
satisfied or complied with by such Buyer at or prior to the Closing Date.

                                     - 32 -



          7.  CONDITIONS TO EACH BUYER'S OBLIGATION TO PURCHASE.

          The  obligation  of each Buyer  hereunder  to purchase  the  Preferred
Shares  from the Company at the  Closing is subject to the  satisfaction,  at or
before the Closing  Date,  of each of the  following  conditions,  provided that
these  conditions  are for each  Buyer's  sole benefit and may be waived by such
Buyer at any time in its sole  discretion  by  providing  the Company with prior
written notice thereof:

               a.  (i)  The Company shall have  executed each of the Transaction
Documents and copies of the  agreements  and  documents  evidencing or otherwise
relating to the Financing Agreement (all certified as true, complete and correct
by the Chief Executive  Officer or Chief  Financial  Officer of the Company) and
delivered  the same to such Buyer,  (ii) McKim shall have executed and delivered
to the Buyers the Investors  Rights Agreement and (iii) each party to the Voting
Agreement shall have executed and delivered to the Buyers the Voting Agreement.

               b.  The Certificate shall have been filed with and made effective
by the  Secretary  of State of the  Commonwealth  of  Massachusetts,  and a copy
thereof  stamped  as filed by the  Secretary  of  State of the  Commonwealth  of
Massachusetts shall have been delivered to such Buyer.

               c.  The order of the United States Bankruptcy Court approving the
CSD  Acquisition  (the "Sale  Order")  shall be in the form  attached  hereto as
Exhibit  E and  (i)  shall  continue  to be in full  force  and  effect  without
modification,  amendment  or  supplement,  (ii) no appeal  shall have been filed
within  the time  period  specified  by Rule  8002(a)  of the  Federal  Rules of
Bankruptcy  Procedure  ("FRBP"),  (iii) in the  event a timely  appeal  has been
filed,  the  effectiveness  of the Sale  Order  shall  not have  been  stayed in
accordance  with  Rule  8005 of the FRBP and (iv) in the  event  such  order was
stayed  pending  appeal,  such stay shall have been  terminated  by a subsequent
court order.

               d.  The  Company  shall  have  consummated  the  CSD  Acquisition
pursuant  to  the  Acquisition  Documents  (without  any  further  amendment  or
modification  thereto that has not been approved in writing by the Buyers).  All
conditions  precedent  to the  obligations  of all  parties  to the  Acquisition
Documents to the  consummation of the CSD Acquisition  shall have been satisfied
(or, with the prior  written  consent of the Buyers,  waived) in the  reasonable
judgment of such Buyer.

               e.  The  Company and  its Subsidiaries  shall have  obtained  all
required licenses,  waivers, consents and approvals,  governmental and otherwise
in connection with the  transactions  contemplated  by the Financing  Agreement,
this  Agreement and the operation of the Company's  business  (including the CSD
Acquisition),  and such licenses, waivers and consents and approvals shall be in
full force and effect.

               f. Such Buyer shall have determined, in its sole discretion, that
no event or development shall have occurred since June 30, 2002 which could have
a  Material   Adverse  Effect  and  that  no  material   disruption  or  adverse
developments in the financial  markets  generally or affecting the securities of

                                     - 33 -



companies in the Company's industry which makes it inadvisable for such Buyer to
proceed with the purchase of the Preferred Shares has occurred.

               g.  There  shall exist  no  claim, action,  suit,  investigation,
litigation  or  proceeding,  pending  or  threatened  in any court or before any
arbitrator or Governmental  Authority which relates to the CSD Acquisition,  the
Sale Order, the Acquisition Documents, this Agreement or the Financing Agreement
or which, in the opinion of such Buyer, has any reasonable  likelihood of having
a Material Adverse Effect.

               h.  The Company  and its  Subsidiaries shall  have  received  the
proceeds of the advance under the  $100,000,000  revolving credit facility ( the
"Congress Loans") to be provided by Congress Financial Corporation  ("Congress")
and there  shall be not less than $25  million  in excess  borrowings  available
under the Congress Loan Documents as of the Closing Date, after giving effect to
the CSD Acquisition,  the transactions  contemplated hereby, under the Financing
Agreement  and the Congress Loan  Documents,  and such Buyer shall have received
copies of the loan agreement, promissory note and other agreements,  instrument,
certificates  and documents  securing,  evidencing or otherwise  relating to the
Congress  Loans (the  "Congress  Loan  Documents"),  which  shall be in form and
substance  satisfactory  to such  Buyer and  which  shall be true,  correct  and
complete,  as certified by the Chief  Executive  Officer or the Chief  Financial
Officer of the Company.

               i.  The Common Stock  (x) shall  be designated  for  quotation or
listed on the Principal  Market and (y) shall not have been suspended by the SEC
or  the  Principal  Market  from  trading  on the  Principal  Market  nor  shall
suspension by the SEC or the Principal Market have been threatened either (A) in
writing by the SEC or the  Principal  Market or (B) by falling below the minimum
listing maintenance requirements of the Principal Market.

               j. The representations and warranties of the Company (both before
and after  giving  effect to the CSD  Acquisition)  shall be true,  complete and
correct in all material  respects  (except for  representations  and  warranties
qualified  by   materiality   or  Material   Adverse   Effect  or  such  similar
qualification,  which shall not be further  qualified)  as of the date when made
and  as  of  the  Closing   Date  as  though  made  at  that  time  (except  for
representations and warranties that speak as of a specific date) and the Company
shall have performed, satisfied and complied with the covenants,  agreements and
conditions required by the Transaction  Documents to be performed,  satisfied or
complied with by the Company at or prior to the Closing  Date.  Such Buyer shall
have  received a  certificate,  executed by the Chief  Executive  Officer or the
Chief  Financial  Officer of the Company,  dated as of the Closing  Date, to the
foregoing effect and as to such other matters as may be reasonably  requested by
such Buyer,  including,  without  limitation,  an update as of the Closing  Date
regarding the representation contained in Section 3(c) above.

               k.    Such Buyer shall have received the opinion of Davis, Malm &
D'Agostine,  P.C.,  dated as of the Closing Date,  in form,  scope and substance
satisfactory  to such Buyer and in  substantially  the form  attached  hereto as
Exhibit F.

                                     - 34 -



               l.  The Company shall  have executed and delivered  to such Buyer
the Preferred  Stock  Certificates  (in such  denominations  as such Buyer shall
request) for the Preferred Shares being purchased by such Buyer at the Closing.

               m.  The Board of Directors  of  the  Company  shall have  adopted
resolutions  consistent  with  Section  3(b)  above  and  in a  form  reasonably
acceptable to such Buyer (the "Resolutions").

               n.  As of the Closing Date,  the Company shall  have reserved out
of its authorized and unissued Common Stock, solely for the purpose of effecting
the  conversion of the Preferred  Shares,  at least  2,380,953  shares of Common
Stock.

               o. The  Irrevocable Transfer  Agent Instructions,  in the form of
Exhibit D  attached  hereto,  shall  have been  delivered  to such  Buyer,  duly
executed by the Company and  acknowledged  in writing by the Company's  transfer
agent.

               p.  The Company shall have delivered  to such Buyer a certificate
evidencing  the  incorporation  and  good  standing  of  the  Company  and  each
Subsidiary in such entity's state of incorporation or organization issued by the
Secretary of State of such state of  incorporation  or organization as of a date
within five days of the Closing Date.

               q.  The Company  shall have  delivered to such  Buyer a certified
copy of the  Articles  of  Organization  as  certified  (or,  in the case of the
Certificate,  stamped as filed) by the Secretary of State of the Commonwealth of
Massachusetts as of a date within five (5) days of the Closing Date.

               r.  The Company shall have  delivered to such Buyer a secretary's
certificate, dated as of the Closing Date, certifying as to (A) the Resolutions,
(B) the Articles of Organization  and (C) the By-laws,  each as in effect at the
Closing.

               s.  The Company shall have  made all filings under all applicable
federal and state  securities  laws  necessary to consummate the issuance of the
Securities pursuant to this Agreement in compliance with such laws.

               t.  The Company shall have delivered to such Buyer a letter  from
the Company's  transfer  agent  certifying  the number of shares of Common Stock
outstanding as of a date within five days of the Closing Date.

               u.  Such Buyer shall be satisfied,  in its sole discretion,  with
the  terms,  amount  and scope of all  Policies  in effect  with  respect to the
Company and its  Subsidiaries  (both before and after  giving  effect to the CSD
Acquisition).

               v.  Such Buyer shall be satisfied,  in its sole  discretion, with
all ERISA, environmental,  tax and labor matters relating to the Company and its
Subsidiaries (both before and after giving effect to the CSD Acquisition).

                                     - 35 -



               w.  Such Buyer shall  be satisfied,  in its sole discretion, with
the terms, conditions and indemnities of each contract,  agreement or instrument
being  assumed  or  guaranteed  by  the  Company  in  connection  with  the  CSD
Acquisition.

                 x. After giving effect to the payment of the purchase price for
the CSD  Acquisition  and all  expenses of the Company and its  Subsidiaries  in
connection  therewith,  the Financing  Agreement and the Congress  Loans,  there
shall be not less than $25,000,000 of unrestricted  borrowing availability under
the Congress Loan Documents,  as certified to such Buyer in writing by the Chief
Executive Officer or Chief Financial Officer of the Company.

               y.   Such  Buyer  shall  have  received  such  other  agreements,
instruments,  certificates and other documents as it may determine are customary
for the transactions  contemplated by the Transaction Documents, in each case in
form and substance satisfactory to such Buyer.

          8.  INDEMNIFICATION.

          In  consideration  of  each  Buyer's  execution  and  delivery  of the
Transaction Documents and acquiring the Securities thereunder and in addition to
all of the Company's other obligations  under the Transaction  Documents and the
Certificate, the Company shall defend, protect, indemnify and hold harmless each
Buyer and each other holder of Preferred  Shares and all of their  stockholders,
officers,  directors,  managers,  members,  employees  and  direct  or  indirect
investors  and any of the  foregoing  persons'  agents or other  representatives
(including,   without   limitation,   those  retained  in  connection  with  the
transactions contemplated by this Agreement)  (collectively,  the "Indemnitees")
from and against any and all actions,  causes of action, suits, claims,  losses,
costs,  penalties,  fees,  liabilities  and damages,  and expenses in connection
therewith  (irrespective of whether any such Indemnitee is a party to the action
for  which  indemnification  hereunder  is  sought),  and  including  reasonable
attorneys' fees and disbursements (the "Indemnified  Liabilities"),  incurred by
any  Indemnitee  as a result  of,  or  arising  out of, or  relating  to (a) any
misrepresentation  or  breach  of any  representation  or  warranty  made by the
Company in the Transaction Documents,  the Certificate or any other certificate,
instrument  or document  contemplated  hereby or thereby,  (b) any breach of any
covenant,  agreement or obligation of the Company  contained in the  Transaction
Documents,  the  Certificate  or any other  certificate,  instrument or document
contemplated  hereby or thereby,  (c) any cause of action, suit or claim brought
or made against  such  Indemnitee  (other than a cause of action,  suit or claim
which  is (x)  brought  or made  by the  Company  and  (y) is not a  shareholder
derivative  suit)  and  arising  out of or  resulting  from  (i) the  execution,
delivery,   performance  or  enforcement  of  the  Transaction  Documents,   the
Certificate or any other certificate, instrument or document contemplated hereby
or thereby, (ii) any transaction financed or to be financed in whole or in part,
directly or  indirectly,  with the proceeds of the issuance of the Securities or
(iii) the status of such Buyer or holder of  Securities  as an  investor  in the
Company.  To the extent  that the  foregoing  undertaking  by the Company may be
unenforceable for any reason, the Company shall make the maximum contribution to
the payment and  satisfaction  of each of the Indemnified  Liabilities  which is
permissible  under  applicable  law.  Except as otherwise set forth herein,  the
mechanics and procedures with respect to the rights and  obligations  under this
Section  8 shall be the same as those set  forth in  Section 5 of the  Investors
Rights Agreement,  including,  without limitation, those procedures with respect

                                     - 36 -



to the  settlement of claims and the  Company's  rights to assume the defense of
claims.

          9.  MISCELLANEOUS.

               a.   Governing  Law;  Jurisdiction;  Jury  Trial.  All  questions
concerning the construction,  validity,  enforcement and  interpretation of this
Agreement  shall be  governed  by the  internal  laws of the  State of New York,
without  giving effect to any choice of law or conflict of law provision or rule
(whether  of the State of New York or any other  jurisdiction)  that would cause
the  application  of the laws of any  jurisdiction  other  than the State of New
York. Each party hereby irrevocably submits to the non-exclusive jurisdiction of
the  state and  federal  courts  sitting  in The City of New  York,  Borough  of
Manhattan,  for the  adjudication  of any  dispute  hereunder  or in  connection
herewith or with any transaction  contemplated  hereby or discussed herein,  and
hereby  irrevocably  waives,  and  agrees  not to assert in any suit,  action or
proceeding,  any claim that it is not personally  subject to the jurisdiction of
any  such  court,  that  such  suit,  action  or  proceeding  is  brought  in an
inconvenient  forum or that the  venue of such  suit,  action or  proceeding  is
improper.  Each party hereby  irrevocably waives personal service of process and
consents  to process  being  served in any such suit,  action or  proceeding  by
mailing a copy thereof to such party at the address for such notices to it under
this Agreement and agrees that such service shall constitute good and sufficient
service of process and notice thereof.  Nothing contained herein shall be deemed
to limit in any way any right to serve  process in any manner  permitted by law.
EACH PARTY HEREBY  IRREVOCABLY  WAIVES ANY RIGHT IT MAY HAVE,  AND AGREES NOT TO
REQUEST,  A JURY  TRIAL FOR THE  ADJUDICATION  OF ANY  DISPUTE  HEREUNDER  OR IN
CONNECTION  HEREWITH  OR  ARISING  OUT OF  THIS  AGREEMENT  OR  ANY  TRANSACTION
CONTEMPLATED HEREBY.

               b.   Counterparts.  This Agreement may be executed in two or more
identical  counterparts,  all of  which  shall  be  considered  one and the same
agreement and shall become effective when  counterparts have been signed by each
party and  delivered to the other  party;  provided  that a facsimile  signature
shall be  considered  due  execution  and shall be  binding  upon the  signatory
thereto with the same force and effect as if the signature were an original, not
a facsimile signature.

               c.   Headings. The headings of this Agreement are for convenience
of reference and shall not form part of, or affect the  interpretation  of, this
Agreement.

               d.  Severability.  If any  provision of  this Agreement  shall be
invalid   or   unenforceable   in   any   jurisdiction,   such   invalidity   or
unenforceability  shall  not  affect  the  validity  or  enforceability  of  the
remainder  of  this   Agreement  in  that   jurisdiction   or  the  validity  or
enforceability of any provision of this Agreement in any other jurisdiction.

               e.  Entire Agreement; Amendments.  This Agreement  supersedes all
other prior oral or written  agreements  between each Buyer, the Company,  their
affiliates  and  persons  acting on their  behalf  with  respect to the  matters
discussed  herein,  and this  Agreement and the  instruments  referenced  herein
contain  the entire  understanding  of the parties  with  respect to the matters

                                     - 37 -



covered  herein and therein  and,  except as  specifically  set forth  herein or
therein,  neither the Company nor any Buyer makes any representation,  warranty,
covenant or  undertaking  with  respect to such  matters.  No  provision of this
Agreement may be amended or waived other than by an instrument in writing signed
by the Company and the  holders of at least a majority of the  Preferred  Shares
then  outstanding.  No such  amendment  shall be effective to the extent that it
applies  to  less  than  all  of  the  holders  of  the  Preferred  Shares  then
outstanding. No consideration shall be offered or paid to any person to amend or
consent to a waiver or  modification  of any provision of any of the Transaction
Documents or the Certificate  unless the same  consideration  also is offered to
all of the parties to the Transaction  Documents or holders of Preferred Shares,
as the case may be.

               f.   Notices.   Any  notices,   consents,   waivers   or    other
communications  required  or  permitted  to be  given  under  the  terms of this
Agreement must be in writing and will be deemed to have been delivered: (i) upon
receipt,  when delivered  personally;  (ii) upon receipt, when sent by facsimile
(provided   confirmation  of  transmission  is  mechanically  or  electronically
generated and kept on file by the sending party);  or (iii) one (1) Business Day
after deposit with a nationally  recognized  overnight delivery service, in each
case  properly  addressed to the party to receive the same.  The  addresses  and
facsimile numbers for such communications shall be:

               If to the Company:

                    Clean Harbors, Inc.
                    1501 Washington Street
                    Braintree, MA  02185
                    Attention: Chief Financial Officer
                    Telephone:  781-849-1800, Ext. 4450
                    Facsimile:   781-848-1632

               With a copy to:

                    Davis, Malm & D'Agostine, P.C.
                    One Boston Place
                    Boston, Massachusetts  02108
                    Attention:  C. Michael Malm, Esq.
                    Telephone:  617-365-2500
                    Facsimile:   617-525-6215


               If to the Transfer Agent:

                    American Stock Transfer & Trust Company
                    6201 15th Avenue
                    Brooklyn, NY  11219
                    Attention: Fran Noftel or Donna Ansbro
                    Telephone:  718-921-8200
                    Facsimile:   718-921-8337


                                     - 38 -



          If to a Buyer, to it at the address and facsimile  number set forth on
the Schedule of Buyers, with copies to such Buyer's representatives as set forth
on the Schedule of Buyers,  or at such other  address  and/or  facsimile  number
and/or  to the  attention  of such  other  person  as the  recipient  party  has
specified  by written  notice  given to each other  party five days prior to the
effectiveness of such change.  Written  confirmation of receipt (A) given by the
recipient  of  such  notice,  consent,   waiver  or  other  communication,   (B)
mechanically  or  electronically  generated  by the sender's  facsimile  machine
containing the time, date,  recipient facsimile number and an image of the first
page of such transmission or (C) provided by a nationally  recognized  overnight
delivery service shall be rebuttable  evidence of personal  service,  receipt by
facsimile or receipt from a nationally  recognized overnight delivery service in
accordance with clause (i), (ii) or (iii) above, respectively.

               g.  Successors and Assigns.  This Agreement shall be binding upon
and inure to the  benefit of the  parties and their  respective  successors  and
assigns, including any purchasers of the Preferred Shares. The Company shall not
assign this Agreement or any rights or obligations  hereunder  without the prior
written  consent of the holders of at least a majority of the  Preferred  Shares
then outstanding,  including by merger or consolidation. A Buyer may assign some
or all of its rights  hereunder  without the consent of the  Company;  provided,
however, that the transferee has agreed in writing to be bound by the applicable
provisions of this Agreement.

               h.  No Third Party Beneficiaries.  This Agreement is intended for
the benefit of the parties hereto and their respective  permitted successors and
assigns, and is not for the benefit of, nor may any provision hereof be enforced
by, any other person.

               i.  Survival.  The representations and  warranties of the Company
and the Buyers  contained in Sections 2 and 3, the  agreements and covenants set
forth in Sections 4, 5 and 9, and the  indemnification  provisions  set forth in
Section 8, shall survive the Closing.  Each Buyer shall be responsible  only for
its own representations, warranties, agreements and covenants hereunder.

               j.  Publicity. The Company and each Buyer shall have the right to
approve before  issuance any press releases or any other public  statements with
respect to the transactions  contemplated hereby;  provided,  however,  that the
Company shall be entitled,  without the prior approval of any Buyer, to make any
press release or other public disclosure with respect to such transactions as is
required  by  applicable  law and  regulations  (although  each  Buyer  shall be
consulted  by the  Company in  connection  with any such press  release or other
public disclosure prior to its release and shall be provided with a copy thereof
and in no event may the Company  disclose  publicly the identity of any Buyer or
their nominees or affiliates without the prior consent of such Buyer).

               k.  Further Assurances. Each party shall do and perform, or cause
to be done and  performed,  all such further acts and things,  and shall execute
and deliver all such other agreements, certificates,  instruments and documents,
as the other party may  reasonably  request in order to carry out the intent and
accomplish  the  purposes  of  this  Agreement  and  the   consummation  of  the
transactions contemplated hereby.

                                     - 39 -



               l. Placement Agent. Except as disclosed in writing to the Buyers,
the Company  acknowledges  that it has not engaged any Person as placement agent
or broker in connection with the sale of the Preferred Shares. The Company shall
be responsible for the payment of any placement agent's fees, financial advisory
fees, or brokers' commissions (other than for persons engaged by or on behalf of
any Buyer) relating to or arising out of the transactions  contemplated  hereby.
The Company shall pay, and hold each Buyer harmless against, any liability, loss
or expense  (including,  without  limitation,  attorney's fees and out-of-pocket
expenses) arising in connection with any such claim.

               m.   No Strict Construction.  The language used in this Agreement
will be deemed to be the language  chosen by the parties to express their mutual
intent, and no rules of strict construction will be applied against any party.

               n.  Remedies.  Each Buyer and each holder of the Securities shall
have all rights and  remedies  set forth in the  Transaction  Documents  and the
Certificate  and all rights and remedies which such holders have been granted at
any time under any other  agreement or contract and all of the rights which such
holders have under any law. Any person  having any rights under any provision of
this Agreement  shall be entitled to enforce such rights  specifically  (without
posting a bond or other security), to recover damages by reason of any breach of
any provision of this Agreement and to exercise all other rights granted by law.

               o.  Payment Set Aside.  To the  extent that  the Company  makes a
payment or payments to any Buyer  hereunder or pursuant to the Investors  Rights
Agreement,  the  Certificate  or the Buyers  enforce or  exercise  their  rights
hereunder  or  thereunder,  and such payment or payments or the proceeds of such
enforcement  or  exercise  or any part  thereof  are  subsequently  invalidated,
declared to be fraudulent or preferential,  set aside, recovered from, disgorged
by or are required to be refunded,  repaid or otherwise restored to the Company,
a  trustee,  receiver  or any other  person  under any law  (including,  without
limitation,  any bankruptcy  law, state or federal law,  common law or equitable
cause of action),  then to the extent of any such  restoration the obligation or
part thereof originally  intended to be satisfied shall be revived and continued
in  full  force  and  effect  as if  such  payment  had  not  been  made or such
enforcement or setoff had not occurred.

                            [signature page follows]


                                     - 40 -



          IN WITNESS  WHEREOF,  the  Buyers and the  Company  have  caused  this
Securities  Purchase  Agreement to be duly executed as of the date first written
above.


COMPANY:

CLEAN HARBORS, INC.


 By:  ______________________________
      Name:
      Title:








                                              BUYERS:

                                              CERBERUS CH LLC


                                              By: Cerberus Partners, L.P.
                                                  its Managing Member

                                              By: Cerberus Associates, L.L.C.
                                                  its General Partner

                                              By:_______________________________
                                                  Name:
                                                  Title:







                                         OAK HILL SECURITIES FUND, L.P.


                                         By: Oak Hill Securities GenPar, L.P.
                                             its General Partner

                                         By: Oak Hill Securities MGP, Inc.
                                             its General Partner

                                         By:______________________________
                                             Name:
                                             Title:


                                         OAK HILL SECURITIES FUND II, L.P.


                                         By: Oak Hill Securities GenPar II, L.P.
                                             its General Partner

                                         By: Oak Hill Securities MGP II, Inc.
                                             its General Partner

                                         By:______________________________
                                             Name:
                                             Title:


                                         LERNER ENTERPRISES, L.P.


                                         By: Oak Hill Asset Management, Inc.
                                             As advisor and attorney-in-fact to
                                             Lerner Enterprises

                                         By:______________________________
                                             Name:
                                             Title:








                                        P&PK FAMILY LTD. PARTNERSHIP


                                        By: Oak Hill Asset Management, Inc.
                                            As advisor and attorney-in-fact to
                                            P&PK Family Ltd. Partnership

                                        By:_______________________________
                                            Name:
                                            Title:


                                        CARDINAL INVESTMENT PARTNERS I, L.P.


                                        By: Oak Hill Advisors, L.P.
                                            As advisor and attorney-in-fact to
                                            Cardinal Investment Partners I, L.P.

                                        By: Oak Hill Advisors MGP, Inc.
                                            its General Partner

                                        By:_______________________________
                                            Name:
                                            Title:




                                   SCHEDULE A




                                               Number of         Amount of
      Investor Address                        Preferred         Commitment of            Investor's Representatives' Address
    and Facsimile Number                        Shares         Preferred Shares             and Facsimile Number

-----------------------------                -------------     ----------------          ------------------------------------
                                                                                 
Cerberus CH LLC                                 16,750              $16,750,000     Schulte Roth & Zabel LLP
450 Park Avenue, 28th Floor                                                         919 Third Avenue
New York, NY 10022                                                                  New York, NY  10022
Telephone:  (212) 891-2100                                                          Attn:  Stuart Freedman, Esq.
Facsimile:  (212) 891-1540                                                          Telephone:  (212) 756-2000
Attention:  Kevin Genda and Daniel Wolf                                             Facsimile:  (212) 593-5955

Oak Hill Securities Fund, L.P.                                                      Paul, Weiss, Rifkind, Wharton &
65 East 55th Street                                                                 Garrison
New York, New York 10022                         3,465              $3,465,000      1285 Avenue of the Americas
Telephone: (212) 326-1552                                                           New York, NY 10019
Facsimile:  (212) 838-8411                                                          Telephone: (212) 373-3000
Attention:  William H. Bohnsack, Jr.                                                Facsimile:  (212) 757-3990
                                                                                    Attention:  Eric Goodison

Oak Hill Securities Fund II, L.P.                                                   Paul, Weiss, Rifkind, Wharton &
65 East 55th Street                                                                 Garrison
New York, New York 10022                         3,465              $3,465,000      1285 Avenue of the Americas
Telephone: (212) 326-1552                                                           New York, NY 10019
Facsimile:  (212) 838-8411                                                          Telephone: (212) 373-3000
Attention:  William H. Bohnsack, Jr.                                                Facsimile:  (212) 757-3990
                                                                                    Attention:  Eric Goodison

Lerner Enterprises, L.P.                                                            Paul, Weiss, Rifkind, Wharton &
65 East 65th Street                                                                 Garrison
New York, New York 10022                          730                $730,000       1285 Avenue of the Americas
Telephone: (212) 326-1552                                                           New York, NY 10019
Facsimile:  (212) 838-8411                                                          Telephone: (212) 373-3000
Attention:  William H. Bohnsack, Jr.                                                Facsimile:  (212) 757-3990
                                                                                    Attention:  Eric Goodison

P&PK Family Ltd. Partnership                                                        Paul, Weiss, Rifkind, Wharton &
65 East 55th Street                                                                 Garrison
New York, New York 10021                          165                $165,000       1285 Avenue of the Americas
Telephone: (212) 326-1552                                                           New York, NY 10019
Facsimile:  (212) 838-8411                                                          Telephone: (212) 373-3000
Attention:  William H. Bohnsack, Jr.                                                Facsimile:  (212) 757-3990
                                                                                    Attention:  Eric Goodison

Cardinal Investment Partners I, L.P.                                                Paul, Weiss, Rifkind, Wharton & Garrison
65 East 55th Street                               425                $425,000       1285 Avenue of the Americas
New York, New York 10021                                                            New York, NY 10019
Telephone: (212) 326-1552                                                           Telephone: (212) 373-3000
Facsimile:  (212) 838-8411                                                          Facsimile:  (212) 757-3990
Attention:  William H. Bohnsack, Jr.                                                Attention:  Eric Goodison








                                                                  Execution Copy

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











                               CLEAN HARBORS, INC.






                           INVESTORS RIGHTS AGREEMENT








                          Dated as of September 6, 2002








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







                        TABLE OF CONTENTS                                   Page
                        -----------------                                   ----

1.  Definitions................................................................1

2.  REGISTRATION UNDER THE SECURITIES ACT......................................6

    2.1.     Demand Registration...............................................6
    2.2.     Incidental Registration...........................................9
    2.3.     S-3 Registration; Shelf Registration.............................11
    2.4.     Underwritten Offerings...........................................12
    2.5.     Expenses.........................................................12
    2.6.     Conversions; Exercises...........................................12
    2.7.     Registration Eligibility.........................................13

3.  HOLDBACK ARRANGEMENTS.....................................................13

    3.1.     Restrictions on Sale by Holders of Registrable Securities........13
    3.2.     Restrictions on Sale by the Company and Others...................14

4.  REGISTRATION PROCEDURES...................................................14

    4.1.     Obligations of the Company.......................................14
    4.2.     Seller Information...............................................18
    4.3.     Notice to Discontinue............................................19

5.  INDEMNIFICATION; CONTRIBUTION.............................................19

    5.1.     Indemnification by the Company...................................19
    5.2.     Indemnification by Holders.......................................20
    5.3.     Conduct of Indemnification Proceedings...........................20
    5.4.     Contribution.....................................................21
    5.5.     Indemnification Payments.........................................21
    5.6.     Other Indemnification............................................21

6.  General Provisions Regarding Registrations................................22

    6.1.     Adjustments Affecting Registrable Securities.....................22
    6.2.     Registration Rights to Others....................................22
    6.3.     Availability of Information; Rule 144; Rule 144A;
                Other Exemptions..............................................22

7.  PROVISIONS APPLICABLE TO SECURITYHOLDERS..................................22

    7.1.     General Restriction..............................................22
    7.2.     Right of Co-Sale.................................................22
    7.3.     Permitted Transfers..............................................23




8.  General.................................................................. 24

    8.1.     Amendments and Waivers...........................................24
    8.2.     Notices..........................................................24
    8.3.     Successors and Assigns...........................................25
    8.4.     Counterparts.....................................................26
    8.5.     Descriptive Headings, Etc........................................26
    8.6.     Severability.....................................................26
    8.7.     CHOICE OF LAW AND VENUE; JURY TRIAL WAIVER.......................26
    8.8.     Remedies; Specific Performance...................................27
    8.9.     Entire Agreement.................................................27
    8.10.    Further Assurances...............................................27
    8.11.    Construction.....................................................27
    8.12.    No Inconsistent Agreement........................................27
    8.13.    Costs and Attorneys' Fees........................................27

































                                      -ii-





                           INVESTORS RIGHTS AGREEMENT

          This INVESTORS RIGHTS AGREEMENT (this "Agreement") is made and entered
into as of September 6, 2002, by and among Clean Harbors,  Inc., a Massachusetts
corporation  (the "Company") the investors  identified as Initial Holders on the
signature pages hereto (the "Initial  Holders"),  Alan S. McKim and the Trustees
of Alan S. McKim's  Children's  Trust (the  "Trust,"  and together  with Alan S.
McKim, "McKim").

                              W I T N E S S E T H :
                              - - - - - - - - - -

          WHEREAS,  simultaneously  herewith,  the  Company  and  certain of its
subsidiaries,   as  borrowers,   certain  of  the  Company's  subsidiaries,   as
guarantors,  the financial  institutions  from time to time parties thereto,  as
lenders,  (the  "Initial  Lenders")  and Ableco  Finance,  LLC, as agent for the
Initial Lenders,  have entered into a Financing Agreement,  dated as of the date
hereof (the "Financing  Agreement"),  pursuant to which the Initial Lenders have
agreed to make  senior and senior  subordinated  loans and other  extensions  of
credit to the Company.

          WHEREAS, simultaneously herewith, the Company and the Initial Holders,
each of whom is an Affiliate of one of the Initial Lenders,  have entered into a
Preferred Stock Purchase Agreement (the "Purchase Agreement"), pursuant to which
the Company has issued and sold to the Initial  Holders and the Initial  Holders
have  purchased,  25,000  shares of Series C  Convertible  Redeemable  Preferred
Stock,  par value  $0.01 per share,  of the  Company  (the  "Series C  Preferred
Stock").

          WHEREAS,  in order to induce  the  Initial  Lenders  to enter into the
Financing  Agreement  and the  Initial  Holders  to enter  into  the  Securities
Purchase Agreement, (i) the Company is granting the Initial Holders registration
rights  and  certain  other  rights  and  (ii)  McKim,  who  will  benefit  as a
significant  shareholder  of the Company by the Initial  Lenders making loans to
the Company under the Financing Agreement and the Company's issuance and sale of
the  Series  C  Preferred  Stock  to the  Initial  Holders  under  the  Purchase
Agreement,  is granting  the Initial  Holders the right to  tag-along to certain
sales of Company securities by McKim, all subject to the terms and conditions of
this Agreement.

          NOW,  THEREFORE,  in  consideration  of the premises and of the mutual
covenants  and  agreements  contained  herein  and for other  good and  valuable
consideration the receipt and sufficiency of which is hereby  acknowledged,  and
intending to be legally bound hereby, the parties hereto agree as follows:

          1.  Definitions.  As used in this Agreement, the following terms shall
have the following meanings:

          "Affiliate"  shall  mean (i) with  respect  to any  Person,  any other
Person  directly or indirectly  controlling  or controlled by or under direct or
indirect  common  control  with  such  Person,  and  (ii)  with  respect  to any
individual, shall also mean the spouse, sibling, child, step-child,  grandchild,
niece, nephew or parent of such Person, or the spouse thereof.

          "Agents" shall have the meaning set forth in Section 5.1.



          "Agreement" shall have the meaning set forth in the preamble.

          "Common  Stock" shall mean shares of common stock,  par value $.01 per
share, of the Company.

          "Company" shall have the meaning set forth in the preamble.

          "Conversion  Shares"  shall mean the  shares of Common  Stock or other
securities issued or issuable upon conversion of the Series C Preferred Stock.

          "Convey" has the meaning set forth in Section 7.1.

          "Demand  Registration"  shall  mean  a  registration  required  to  be
effected by the Company pursuant to Section 2.1.

          "Demand Registration Statement" shall mean a registration statement of
the Company  which covers the  Registrable  Securities  requested to be included
therein  pursuant  to the  provisions  of  Section  2.1 and all  amendments  and
supplements to such registration statement, including post-effective amendments,
in each case including the Prospectus  contained  therein,  all exhibits thereto
and all material  incorporated  by reference  (or deemed to be  incorporated  by
reference) therein.

          "Encumbrance" shall mean any lien, claim,  charge,  security interest,
mortgage, pledge, easement, conditional sale or other title retention agreement,
defect in title, covenant or other restriction of any kind.

          "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
amended  from time to time,  and the rules and  regulations  thereunder,  or any
successor statute.

          "Financing  Agreement"  shall have the  meaning set forth in the first
recital.

          "Governmental  Entity"  shall mean any  domestic  (federal and state),
foreign  or  supranational  court,  commission,  governmental  body,  regulatory
agency, authority or tribunal.

          "Holders"  shall mean the Initial  Holders for so long as they are the
registered  owner  of any  Registrable  Securities  and  such  of  their  heirs,
successors  and  permitted  assigns  (including  any  permitted  transferees  of
Registrable   Securities)  who  acquire  or  are  otherwise  the  transferee  of
Registrable Securities,  directly or indirectly, from any Initial Holder (or any
subsequent Holder), for so long as such heirs,  successors and permitted assigns
are the registered  owner of any  Registrable  Securities.  For purposes of this
Agreement,  a Person will be deemed to be a Holder whenever such Person holds an
option  to  purchase,   or  a  security   convertible  into  or  exercisable  or
exchangeable  for,  Registrable  Securities,   whether  or  not  such  purchase,
conversion, exercise or exchange has actually been effected and disregarding any
legal  restrictions  upon the  exercise of such rights.  Registrable  Securities
issuable upon exercise of an option or upon conversion,  exchange or exercise of
another security shall be deemed outstanding for the purposes of this Agreement.

                                       2



          "Holder's  Counsel" shall mean one firm of counsel (per  registration)
to the Holders of Registrable  Securities  participating  in such  registration,
which counsel shall be selected (i) in the case of a Demand Registration, by the
Initiating  Holders holding a majority of the  Registrable  Securities for which
registration  was requested in the Request,  and (ii) in all other cases, by the
Majority Holders of the Registration.

          "Incidental  Registration"  shall mean a  registration  required to be
effected by the Company pursuant to Section 2.2.

          "Incidental   Registration   Statement"   shall  mean  a  registration
statement of the Company,  which covers the Registrable  Securities requested to
be included therein pursuant to the provisions of Section 2.2 and all amendments
and  supplements  to  such  registration  statement,   including  post-effective
amendments,  in each  case  including  the  Prospectus  contained  therein,  all
exhibits  thereto and all material  incorporated  by reference  (or deemed to be
incorporated by reference) therein.

          "Initial Holders" shall have the meaning set forth in the preamble.

          "Initial  Lenders"  shall  have the  meaning  set  forth in the  first
recital.

          "Initiating   Holders"  shall  mean,  with  respect  to  a  particular
registration, the Holders who initiated the Request for such registration.

          "Inspector"  or  "Inspectors"  has the  meaning  set forth in  Section
4.1(g).

          "Majority  Holders"  shall  mean one or more  Holders  of  Registrable
Securities  who  would  hold a  majority  of  the  Registrable  Securities  then
outstanding.

          "Majority Holders of the  Registration"  shall mean, with respect to a
particular registration, one or more Holders of Registrable Securities who would
hold  a  majority  of  the  Registrable   Securities  to  be  included  in  such
registration.

          "McKim" has the meaning set forth in the preamble.

          "NASD" shall mean the National Association of Securities Dealers, Inc.

          "Nasdaq  National  Market" shall have the meaning set forth in Section
4.1(k).

          "No-Action Letter" shall have the meaning set forth in Section 2.7

          "Permitted  Family  Transferee"  has the  meaning set forth in Section
7.3.

          "Person" shall mean any individual,  firm,  partnership,  corporation,
trust,  joint  venture,  association,  joint stock  company,  limited  liability
company,  unincorporated  organization  or any  other  entity  or  organization,
including a government  or agency or political  subdivision  thereof,  and shall
include any successor (by merger or otherwise) of such entity.

          "Pro Rata Share" has the meaning set forth in Section 7.2(a).

                                       3



          "Prospectus"  shall mean the  prospectus  included  in a  Registration
Statement  (including,  without limitation,  any preliminary  prospectus and any
prospectus  that includes any information  previously  omitted from a prospectus
filed as part of an effective  registration statement in reliance upon Rule 430A
promulgated  under the  Securities  Act) and any such  Prospectus  as amended or
supplemented  by  any  prospectus  supplement,  and  all  other  amendments  and
supplements to such Prospectus, including post-effective amendments, and in each
case  including  all  material  incorporated  by  reference  (or  deemed  to  be
incorporated by reference) therein.

          "Purchase Agreement" has the meaning set forth in the second recital.

          "Purchaser" has the meaning set forth in Section 7.2(a).

          "Purchase Offer" has the meaning set forth in Section 7.2(a).

          "Records" shall have the meaning set forth in Section 4.1(g).

          "Registrable  Securities"  shall mean (i) any Conversion  Shares,  and
(ii) any other  securities  of the  Company (or any  successor  or assign of the
Company,  whether by merger,  consolidation,  sale of assets or otherwise) which
may be  issued  with  respect  to,  in  exchange  for,  or in  substitution  of,
Conversion  Shares by reason of any  dividend  or stock  split,  combination  of
shares,    merger,    consolidation,     recapitalization,     reclassification,
reorganization,  sale of assets or  similar  transaction.  As to any  particular
Registrable Securities, such securities shall cease to be Registrable Securities
when (A) a registration  statement  with respect to the sale of such  securities
shall have been declared  effective under the Securities Act and such securities
shall have been disposed of in accordance with such registration statement,  (B)
such securities are sold pursuant to Rule 144 (or any similar provisions then in
force)  under the  Securities  Act,  (C) such  securities  have  been  otherwise
transferred  and a new  certificate  or other evidence of ownership for them not
bearing the legend restricting further transfer shall have been delivered by the
Company  and  subsequent   public   distribution   of  them  shall  not  require
registration  under the Securities Act, or (D) such securities shall have ceased
to be outstanding.

          "Registration  Expenses"  shall  mean  any and all  reasonable  out of
pocket expenses  incident to performance of or compliance with this Agreement by
the Company and its  subsidiaries,  including,  without  limitation (i) all SEC,
stock exchange,  NASD and other registration,  listing and filing fees, (ii) all
fees and expenses  incurred in connection with compliance with state  securities
or blue sky laws and compliance with the rules of any stock exchange  (including
fees and  disbursements  of counsel in connection  with such  compliance and the
preparation  of a blue sky memorandum and legal  investment  survey),  (iii) all
printers'  fees and  costs  incurred  in  printing,  distributing,  mailing  and
delivering  any  Registration  Statement,  any Prospectus and any other document
relating to the performance of or compliance with this Agreement,  (iv) the fees
and disbursements of counsel for the Company,  (v) the fees and disbursements of
Holders'  Counsel,  (vi) the fees and  disbursements  of all independent  public
accountants  (including the expenses of any audit and/or "cold comfort" letters)
and the fees and expenses of other Persons,  including experts,  retained by the
Company,  (vii) the  expenses  incurred  in  connection  with  making  road show
presentations  and holding  meetings with potential  investors to facilitate the
distribution   and  sale  of  Registrable   Securities,   (viii)  any  fees  and
disbursements  of  underwriters  customarily  paid  by  issuers  or  sellers  of

                                       4



securities,  (ix)  premiums  and other costs of policies  of  insurance  against
liabilities  arising out of the public  offering of the  Registrable  Securities
being registered,  and (x) all internal  expenses of the Company  (including all
salaries and expenses of officers and employees  performing  legal or accounting
duties);  provided,  however,  Registration Expenses shall not include discounts
and commissions  payable to underwriters,  selling  brokers,  dealer managers or
other similar  Persons  engaged in the  distribution  of any of the  Registrable
Securities;  provided, further, that in any case where Registration Expenses are
not to be borne by the  Company,  such  expenses  shall not include  salaries of
Company  personnel or general overhead  expenses of the Company,  auditing fees,
premiums  or  other  expenses  relating  to  liability   insurance  required  by
underwriters  of the Company or other expenses for the  preparation of financial
statements or other data normally prepared by the Company in the ordinary course
of its  business or which the  Company  would have  incurred  in any event;  and
provided,  further,  that in the  event  the  Company  shall  not  register  any
securities with respect to which it had given written notice of its intention to
register to Holders,  notwithstanding anything to the contrary in the foregoing,
all of the costs  incurred by the Holders in connection  with such  registration
shall be deemed to be Registration Expenses.

          "Registration  Statement" shall mean any registration statement of the
Company  which  covers  any  Registrable   Securities  and  all  amendments  and
supplements  to  any  such  Registration  Statement,   including  post-effective
amendments,  in each  case  including  the  Prospectus  contained  therein,  all
exhibits  thereto and all material  incorporated  by reference  (or deemed to be
incorporated by reference) therein.

          "Request" shall have the meaning set forth in Section 2.1(a).

          "SEC"  shall  mean the  Securities  and  Exchange  Commission,  or any
successor agency having jurisdiction to enforce the Securities Act.

          "Securities  Act" shall mean the  Securities  Act of 1933,  as amended
from time to time, and the rules and  regulations  thereunder,  or any successor
statute.

          "Series C  Preferred  Stock"  shall have the  meaning set forth in the
second recital.

          "Shelf  Registration"  shall  have the  meaning  set forth in  Section
2.1(a).

          "Stockholders" shall mean, collectively, the holders of Common Stock.

          "Subordinated  Note  Holders"  shall  have the  meaning  set  forth in
Section 2.1(b).

          "Subordinated  Note Holder  Registration  Rights Agreement" shall have
the meaning set forth in Section 2.1(b).

          "Subordinated  Note Holder Warrant  Shares" shall have the meaning set
forth in Section 2.1(b).

          "Underwriters"  shall mean the  underwriters,  if any, of the offering
being registered under the Securities Act.

                                       5



          "Underwritten Offering" shall mean a sale of securities of the Company
to an Underwriter or Underwriters for reoffering to the public.

          "Withdrawn  Demand  Registration"  shall have the meaning set forth in
Section 2.1(a).

          "Withdrawn  Request"  shall  have the  meaning  set  forth in  Section
2.1(a).

          2.   REGISTRATION UNDER THE SECURITIES ACT.

               2.1.  Demand Registration.

                    (a)   Right  to  Demand  Registration.  Subject  to  Section
2.1(c) and  Section 2.7  hereof,  at any time or from time to time,  any Initial
Holder (or an assignee to whom such Initial  Holder has  expressly  delegated or
assigned  all or any portion of its rights under this  sentence)  shall have the
right to  request  in  writing  that the  Company  register  all or part of such
Holders'  Registrable  Securities (a "Request") (which Request shall specify the
amount of Registrable  Securities intended to be disposed of by such Holders and
the  intended  method of  disposition  thereof)  by filing with the SEC a Demand
Registration  Statement.  As promptly as practicable,  but no later than 15 days
after  receipt of a Request,  the  Company  shall  give  written  notice of such
requested registration to all other Holders of Registrable  Securities.  Subject
to Section 2.1(b),  the Company shall include in a Demand  Registration  (A) the
Registrable  Securities intended to be disposed of by the Initiating Holders and
(B) the  Registrable  Securities  intended to be disposed of by any other Holder
which shall have made a written  request (which request shall specify the amount
of  Registrable   Securities  to  be  registered  and  the  intended  method  of
disposition  thereof) to the Company for inclusion  thereof in such registration
within 20 days after the receipt of such written  notice from the  Company.  The
Company shall, as expeditiously as reasonably  practicable  following a Request,
use its best  efforts  to cause to be filed  with the SEC a Demand  Registration
Statement  providing  for  the  registration  under  the  Securities  Act of the
Registrable  Securities  which the Company has been so  requested to register by
all such  Holders,  to the extent  necessary to permit the  disposition  of such
Registrable  Securities to be registered in accordance with the intended methods
of disposition thereof specified in such Request or further requests (including,
without limitation,  by means of a shelf registration pursuant to Rule 415 under
the Securities Act (a "Shelf  Registration")  if so requested and if the Company
is then  eligible to use such a  registration).  The Company  shall use its best
efforts to have such Demand Registration Statement declared effective by the SEC
as soon as practicable thereafter and to keep such Demand Registration Statement
continuously effective for the period specified in Section 4.1(b).

                         (i)  A Request  may be withdrawn prior to the filing of
          the  Demand  Registration  Statement  by the  Majority  Holders of the
          Registration  (a  "Withdrawn   Request")  and  a  Demand  Registration
          Statement may be withdrawn prior to the  effectiveness  thereof by the
          Majority   Holders   of  the   Registration   (a   "Withdrawn   Demand
          Registration"),  and such  withdrawals  shall be  treated  as a Demand
          Registration  which shall have been effected  pursuant to this Section
          2.1,  unless the Holders of  Registrable  Securities to be included in
          such Registration  Statement  reimburse the Company for its reasonable
          out-of-pocket  Registration  Expenses  relating to the preparation and
          filing of such Demand  Registration  Statement (to the extent actually

                                       6



          incurred),  in which  case such  withdrawal  shall not be treated as a
          Demand  Registration  effected pursuant to this Section 2.1 (and shall
          not be counted toward the number of Demand  Registrations);  provided,
          however,  that  if  a  Withdrawn  Request  or  Withdrawn  Registration
          Statement  is made (A)  because  of a material  adverse  change in the
          business,  financial  condition or  prospects  of the Company,  or (B)
          because the sole or lead managing  Underwriter advises that the amount
          of  Registrable  Securities  to be sold in such  offering  be  reduced
          pursuant  to  Section  2.1(b)  by  more  than  15% of the  Registrable
          Securities to be included in such  Registration  Statement,  then such
          withdrawal  shall not be  treated  as a Demand  Registration  effected
          pursuant  to this  Section  2.1 (and shall not be  counted  toward the
          number  of  Demand  Registrations)  and  the  Company  shall  pay  all
          Registration Expenses in connection  therewith.  Any Holder requesting
          inclusion  in a Demand  Registration  may,  at any  time  prior to the
          effective  date of the  Demand  Registration  Statement  (and  for any
          reason)  revoke  such  request  by  delivering  written  notice to the
          Company revoking such requested inclusion.

                         (ii)   The registration rights  granted pursuant to the
          provisions   of  this   Section  2.1  shall  be  in  addition  to  the
          registration  rights  granted  pursuant  to the  other  provisions  of
          Section 2 hereof.

                    (b)  Priority   in   Demand   Registrations.   If  a  Demand
Registration  involves an Underwritten  Offering,  and the sole or lead managing
Underwriter,  as the case may be, of such Underwritten Offering shall advise the
Company in writing (with a copy to each Holder  requesting  registration)  on or
before the date five days  prior to the date then  scheduled  for such  offering
that,  in its  opinion,  the amount of  Registrable  Securities  requested to be
included in such  Demand  Registration  exceeds the number  which can be sold in
such offering  within a price range  acceptable  to the Majority  Holders of the
Registration  (such  writing  to  state  the  basis  of  such  opinion  and  the
approximate  number of  Registrable  Securities  which may be  included  in such
offering),  and the  Request is not  thereafter  withdrawn,  the  Company  shall
include in such  Demand  Registration,  to the  extent of the  number  which the
Company is so advised  may be  included in such  offering,  (i) the  Registrable
Securities  requested to be included in the Demand  Registration  by the Holders
and (ii) the Common Stock issuable upon exercise of warrants (the  "Subordinated
Note  Holder  Warrant  Shares")  issued to the holders of the  Company's  Senior
Subordinated  Notes due 2008 (the  "Subordinated  Note  Holders")  to the extent
requested  to  be  registered  by  the  Subordinated  Note  Holders   exercising
"piggyback"   registration   rights  pursuant  to  the  terms  of  that  certain
Registration   Rights  Agreement,   dated  as  of  April  30,  2001,  among  the
Subordinated  Note  Holders and the Company as in effect on the date hereof (the
"Subordinated  Note  Holder  Registration  Rights  Agreement"),   in  each  case
allocated  pro rata in proportion to the number of  Registrable  Securities  and
Subordinated  Note Holder  Warrant  Shares to be registered by the  Subordinated
Note  Holders  requested to be included in such Demand  Registration  by each of
them.  In the event the  Company  shall not, by virtue of this  Section  2.1(b),
include in any Demand  Registration  all of the  Registrable  Securities  of any
Holder  requested to be included in such Demand  Registration,  such Holder may,
upon  written  notice to the  Company  given  within  five days of the date such
Holder  first  is  notified  of  such  matter,  further  reduce  the  amount  of
Registrable  Securities it desires to have included in such Demand Registration,
whereupon  only the  Registrable  Securities,  if any,  that it  desires to have

                                       7



included  will be so included and the Holders not so reducing  shall be entitled
to a corresponding pro rata increase in the amount of Registrable  Securities to
be included in such Demand Registration.

                    (c) Limitations on Registrations.  The rights of  Holders of
Registrable  Securities  to request  Demand  Registrations  pursuant  to Section
2.1(a) are subject to the following  limitations:  in no event shall the Company
be required to effect a Demand Registration unless the aggregate offering price,
net of underwriting discounts and commissions, is at least $5,000,000; provided,
however,  that the Company  shall be  required  to effect a Demand  Registration
regardless  of the  aggregate  offering  price in the  event  that the  Majority
Holders are disposing of all of the  Registrable  Securities  held by them;  and
(iii) in no event  shall the  Company be  required  to effect  more than (A) two
Demand  Registrations for the benefit of Cerberus CH LLC, an Initial Holder, and
its  successors and assigns and (B) one Demand  Registration  for the benefit of
all of the Initial Holders that are Affiliates of Oak Hill Advisors,  Inc. ("Oak
Hill") or accounts or funds that Oak Hill or its  Affiliates  control or advise,
and their successor and assigns;  provided,  however,  that such number shall be
increased to the extent the Company (x) does not include in what would otherwise
be the final  registration for which the Company is required to pay Registration
Expenses the number of Registrable  Securities requested to be registered by the
Holders  by reason of  Section  2.1(b) or (y)  terminates  a Shelf  Registration
pursuant  to  Section  2.3  prior to the time  that all  Registrable  Securities
covered by such Shelf Registration have been sold; and provided,  further,  that
the Registration Expenses in connection with each additional Demand Registration
shall be allocated pro rata among all Persons on whose behalf  securities of the
Company  are  included  in such  registration,  on the  basis of the  respective
amounts of the securities then being registered on their behalf.

                    (d) Underwriting; Selection of Underwriters. Notwithstanding
anything to the contrary  contained in Section 2.1(a), if the Initiating Holders
holding a majority of the  Registrable  Securities  for which  registration  was
requested in the Request so elect, the offering of such  Registrable  Securities
pursuant to such Demand  Registration  shall be in the form of a firm commitment
Underwritten  Offering and such Initiating  Holders may require that all Persons
(including  other  Holders)   participating  in  such  registration  sell  their
Registrable  Securities  to the  Underwriters  at the same price and on the same
terms of  underwriting  applicable  to the  Initiating  Holders.  If any  Demand
Registration   involves  an   Underwritten   Offering,   the  sole  or  managing
Underwriters  and any additional  investment  bankers and managers to be used in
connection  with such  registration  shall be selected by the Company subject to
the approval of the Majority Holders of the Registration.

                    (e)  Effective Registration Statement; Suspension.  A Demand
Registration  Statement  shall not be deemed to have become  effective  (and the
related registration will not be deemed to have been effected) (i) unless it has
been declared  effective by the SEC and remains effective in compliance with the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
Registrable  Securities  covered by such Demand  Registration  Statement for the
time period specified in Section 4.1(b), (ii) if the offering of any Registrable
Securities pursuant to such Demand Registration  Statement is interfered with by
any stop order, injunction or other order or requirement of the SEC or any other
governmental  agency  or  court,  or (iii)  if,  in the case of an  Underwritten
Offering,  the conditions to closing  specified in an underwriting  agreement to
which the Company is a party are not satisfied (other than by the sole reason of
any breach or failure by the  Holders  of  Registrable  Securities)  and are not
otherwise waived.

                                       8



                    (f)  Registration Statement Form.  Registrations under this
Section 2.1 shall be on Form S-3 (or a  successor  form  thereto  adopted by the
SEC)  or,  if such  Form  is not  then  available,  on  such  other  appropriate
registration  form of the SEC as shall be  selected  by the  Initiating  Holders
holding a majority of the Registrable  Securities for which the registration was
requested  in the  Request  and  which  shall  be  available  for  the  sale  of
Registrable  Securities  in  accordance  with the intended  method or methods of
disposition  specified in the requests for  registration.  The Company agrees to
include in any such  Registration  Statement all  information  which any selling
Holder, upon advice of counsel, shall reasonably request.

                    (g) Other Registrations.  During the period (i) beginning on
the date of a Request and (ii) ending on the date that is 90 days after the date
that a Demand  Registration  Statement  filed  pursuant to such Request has been
declared  effective by the SEC or, if the Holders shall withdraw such Request or
such Demand  Registration  Statement,  on the date of such Withdrawn  Request or
such  Withdrawn  Registration  Statement,  the  Company  shall not,  without the
consent  of the  Majority  Holders  of  the  Registration,  file a  registration
statement pertaining to any other securities of the Company except to the extent
(if any) that such filing may then be required and not subject to deferral under
the Subordinated Note Holder Registration Rights Agreement.

               2.2.   Incidental Registration.

                    (a)  Right to  Include Registrable  Securities.  (i)  If the
Company  at any  time or  from  time to time  proposes  to  register  any of its
securities under the Securities Act (other than in a registration on Form S-4 or
S-8 or any  successor  form to such forms and other than pursuant to Section 2.1
or 2.3) whether or not pursuant to registration  rights granted to other holders
of its securities  and whether or not for sale for its own account,  the Company
shall  deliver  prompt  written  notice (which notice shall be given at least 45
days  prior  to  such  proposed  registration)  to all  Holders  of  Registrable
Securities  of its  intention  to undertake  such  registration,  describing  in
reasonable  detail the proposed  registration  and  distribution  (including the
anticipated  range of the  proposed  offering  price,  the class  and  number of
securities  proposed to be registered and the distribution  arrangements) and of
such Holders' right to participate in such  registration  under this Section 2.2
as hereinafter provided.  Subject to the other provisions of this Section 2.2(a)
and Section  2.2(b),  upon the written request of any Holder made within 30 days
after the receipt of such written notice (which request shall specify the amount
of  Registrable   Securities  to  be  registered  and  the  intended  method  of
disposition  thereof),  the  Company  shall  effect the  registration  under the
Securities  Act of all  Registrable  Securities  requested  by  Holders to be so
registered (an "Incidental Registration"),  to the extent required to permit the
disposition  (in accordance  with the intended  methods thereof as aforesaid) of
the Registrable Securities so to be registered, by inclusion of such Registrable
Securities in the  Registration  Statement which covers the securities which the
Company  proposes to register  and shall cause such  Registration  Statement  to
become and remain  effective  with  respect to such  Registrable  Securities  in
accordance  with the  registration  procedures  set  forth in  Section  4. If an
Incidental  Registration  involves an Underwritten  Offering,  immediately  upon
notification  to the  Company  from the  Underwriter  of the price at which such
securities  are to be sold,  the  Company  shall so  advise  each  participating
Holder. The Holders requesting  inclusion in an Incidental  Registration may, at

                                       9



any time prior to the effective  date of the Incidental  Registration  Statement
(and for any reason),  revoke such request by delivering  written  notice to the
Company revoking such requested inclusion.

                         (ii)  If at any time after giving written notice of its
          intention to register any  securities  and prior to the effective date
          of the Incidental Registration Statement filed in connection with such
          registration,  the  Company  shall  determine  for any  reason  not to
          register or to delay registration of such securities, the Company may,
          at its election,  give written  notice of such  determination  to each
          Holder of Registrable Securities and, thereupon,  (A) in the case of a
          determination  not to register,  the Company  shall be relieved of its
          obligation to register any  Registrable  Securities in connection with
          such registration (but not from its obligation to pay the Registration
          Expenses  incurred  in  connection   therewith),   without  prejudice,
          however,  to the rights of Holders  to cause such  registration  to be
          effected as a registration  under Section 2.1 and (B) in the case of a
          determination  to  delay  such  registration,  the  Company  shall  be
          permitted to delay the registration of such Registrable Securities for
          the same  period as the delay in  registering  such other  securities;
          provided,  however,  that if such delay  shall extend beyond  120 days
          from the date the  Company  received a request to include  Registrable
          Securities  in such  Incidental  Registration,  then the Company shall
          again give all  Holders the  opportunity  to  participate  therein and
          shall follow the  notification  procedures  set forth in the preceding
          paragraph.  There is no  limitation  on the number of such  Incidental
          Registrations  pursuant  to this  Section  2.2  which the  Company  is
          obligated to effect.

                         (iii)   The registration rights granted pursuant to the
          provisions   of  this   Section  2.2  shall  be  in  addition  to  the
          registration  rights  granted  pursuant  to the  other  provisions  of
          Section 2 hereof.

                    (b)  Priority  in Incidental Registration.  If an Incidental
Registration involves an Underwritten Offering (on a firm commitment basis), and
the  sole  or the  lead  managing  Underwriter,  as the  case  may  be,  of such
Underwritten  Offering  shall advise the Company in writing (with a copy to each
Holder  requesting  registration)  on or before  the date five days prior to the
date then  scheduled  for such  offering  that,  in its  opinion,  the amount of
securities (including  Registrable  Securities) requested to be included in such
registration  exceeds  the  amount  which can be sold in such  offering  without
materially  interfering  with the successful  marketing of the securities  being
offered  (such  writing to state the basis of such  opinion and the  approximate
number of such  securities  which may be included in such offering  without such
effect),  the Company shall include in such  registration,  to the extent of the
number which the Company is so advised may be included in such offering  without
such effect,  (i) in the case of a  registration  initiated by the Company,  (A)
first,  the securities that the Company proposes to register for its own account
(but  solely  to the  extent  that the  proceeds  thereof  shall  not be used to
purchase  shares of  common  stock of the  Company  or other  securities  of the
Company),  (B) second,  the Registrable  Securities  requested to be included in
such registration by the Holders and the Subordinated Note Holder Warrant Shares
requested to be registered in such registration by the Subordinated Note Holders
pursuant  to  the  Subordinated  Note  Holder   Registration  Rights  Agreement,
allocated  pro rata in proportion to the number of  Registrable  Securities  and
Subordinated  Note  Holder  Warrant  Shares  requested  to be  included  in such
registration by each of them, and (C) third,  other securities of the Company to
be registered on behalf of any other Person,  (ii) in the case of a registration
initiated by a Person other than the Company or the  Subordinated  Note Holders,
(A)  first,  the  Registrable  Securities  requested  to  be  included  in  such
registration  by the  Holders,  the  Subordinated  Note  Holder  Warrant  Shares
requested to be included in such  registration by the Subordinated  Note Holders
pursuant to the Subordinated Note Holder  Registration  Rights Agreement and any
Persons  initiating such  registration,  allocated pro rata in proportion to the
number of securities  requested to be included in such  registration  by each of
them, (B) second,  the securities that the Company  proposes to register for its
own account,  and (C) third,  the  securities of the Company to be registered on

                                       10



behalf of any other Person and (iii) in the case of a registration  initiated by
the  Subordinated  Note  Holders  pursuant  to  the  Subordinated  Note  Holders
Registration  Rights Agreement,  (A) first, the Subordinated Note Holder Warrant
Shares requested to be included in such  registration by the  Subordinated  Note
Holders pursuant to the Subordinated Note Holder  Registration Rights Agreement,
(B)  second,  the  Registrable  Securities  requested  to be  included  in  such
registration  by the Holders,  allocated pro rata in proportion to the number of
securities  requested to be included in such  registration  by each of them, (C)
third, the securities that the Company proposes to register for its own account,
and (D) fourth,  the securities of the Company to be registered on behalf of any
other  Person;  provided,  however,  that in the event the Company  will not, by
virtue of this  Section  2.2(b),  include  in any such  registration  all of the
Registrable   Securities  of  any  Holder  requested  to  be  included  in  such
registration,  such Holder may, upon written  notice to the Company given within
three days of the time such Holder first is notified of such matter,  reduce the
amount  of   Registrable   Securities  it  desires  to  have  included  in  such
registration,  whereupon only the Registrable Securities,  if any, it desires to
have  included  will be so included  and the  Holders  not so reducing  shall be
entitled  to a  corresponding  pro rata  increase  in the amount of  Registrable
Securities to be included in such registration.

                   (c) Selection of Underwriters. If any Incidental Registration
involves an Underwritten Offering,  the sole or managing  Underwriter(s) and any
additional  investment  bankers and managers to be used in connection  with such
registration  shall be subject to the  approval of the  Majority  Holders of the
Registration (such approval not to be unreasonably withheld).

               2.3.   S-3 Registration; Shelf Registration.

                    (a)  Shelf Registration.  If  a  request  made  pursuant  to
Section 2.1 is for a Shelf  Registration,  subject to Section  2.7,  the Company
shall use its best efforts to keep the Shelf Registration continuously effective
through  the date on which all of the  Registrable  Securities  covered  by such
Shelf  Registration may be sold pursuant to Rule 144(k) under the Securities Act
(or any successor  provision having similar  effect);  provided,  however,  that
prior to the  termination  of such Shelf  Registration,  the Company shall first
furnish to each Holder of  Registrable  Securities  participating  in such Shelf
Registration (i) an opinion, in form and substance  satisfactory to the Majority
Holders of the  Registration,  of counsel  for the Company  satisfactory  to the
Majority  Holders of the Registration  stating that such Registrable  Securities
are freely  saleable  pursuant to Rule 144(k) under the  Securities  Act (or any
successor provision having similar effect) or (ii) a "No-Action Letter" from the
staff of the SEC stating that the SEC would not recommend  enforcement action if
the Registrable  Securities  included in such Shelf  Registration were sold in a
public sale other than pursuant to an effective registration statement.

                                       11



               2.4.   Underwritten Offerings.

                    (a)  Demand Underwritten Offerings. If requested by the sole
or lead managing Underwriter for any Underwritten  Offering effected pursuant to
a Demand  Registration,  the Company  shall enter into a customary  underwriting
agreement  with  the  Underwriters  for  such  offering,  such  agreement  to be
reasonably  satisfactory in substance and form to the Company and each Holder of
Registrable  Securities  participating  in such  offering  and to  contain  such
representations  and  warranties  by the  Company  and such  other  terms as are
generally prevailing in agreements of that type, including,  without limitation,
indemnification  and  contribution  to the effect and to the extent  provided in
Section 5.

                    (b)  Holders of  Registrable  Securities to  be  Parties  to
Underwriting Agreement.  The Holders of Registrable Securities to be distributed
by Underwriters in an Underwritten  Offering  contemplated by Section 2 shall be
parties to the underwriting  agreement between the Company and such Underwriters
and may, at such Holders' option, require that any or all of the representations
and warranties  by, and the other  agreements on the part of, the Company to and
for the benefit of such  Underwriters  shall also be made to and for the benefit
of such Holders of Registrable  Securities and that any or all of the conditions
precedent  to the  obligations  of such  Underwriters  under  such  underwriting
agreement  be  conditions  precedent  to the  obligations  of  such  Holders  of
Registrable  Securities;  provided,  however,  that  the  Company  shall  not be
required  to make any  representations  or  warranties  with  respect to written
information  specifically  provided  by a selling  Holder for  inclusion  in the
Registration  Statement. No Holder shall be required to make any representations
or  warranties  to,  or  agreements  with,  the  Company  or (in the  case of an
Incidental Registration) the Underwriters other than representations, warranties
or agreements  regarding such Holder, such Holder's  Registrable  Securities and
such Holder's intended method of disposition.

                    (c)  Participation in Underwritten Registration.
Notwithstanding  anything  herein to the contrary,  no Person may participate in
any  underwritten  registration  hereunder unless such Person (i) agrees to sell
its  securities on the same terms and  conditions  provided in any  underwritten
arrangements  approved  by  the  Persons  entitled  hereunder  to  approve  such
arrangement  and (ii)  accurately  completes and executes in a timely manner all
questionnaires,   powers   of   attorney,   indemnities,   custody   agreements,
underwriting  agreements and other documents reasonably required under the terms
of such underwriting arrangements.

               2.5.  Expenses.  The Company  shall pay all Registration Expenses
in connection  with any Demand  Registration,  Incidental  Registration or Shelf
Registration whether or not such registration shall become effective and whether
or not all Registrable  Securities  originally  requested to be included in such
registration  are  withdrawn  or  otherwise  ultimately  not  included  in  such
registration,  except as otherwise  provided with respect to a Withdrawn Request
and a Withdrawn Demand Registration in Section 2.1(a).

               2.6.  Conversions; Exercises.  Notwithstanding  anything  to  the
contrary herein, in order for any Registrable  Securities that are issuable upon
the  exercise of  conversion  rights,  options or warrants to be included in any
registration  pursuant  to Section 2 hereof,  the  exercise  of such  conversion
rights,  options or warrants must be effected no later than immediately prior to

                                       12



the closing of any sales under the Registration Statement pursuant to which such
Registrable Securities are to be sold.

               2.7.   Registration Eligibility.  The  Company  and  each Initial
Holder  acknowledge  that the Company is operating on the date hereof pursuant a
No-Action  Letter  from the SEC in the form  attached  hereto as  Exhibit A (the
"No-Action Letter"),  which may limit the Company's ability to have Registration
Statements  covering  Registrable  Securities  declared effective by the SEC. In
light of the  foregoing,  the Company and the Initial  Holders agree that if the
Company,  solely  by  virtue  of the  limitations  expressly  set  forth  in the
No-Action  Letter,  is  unable  to  have  any  Registration  Statement  covering
Registrable  Securities  declared effective by the SEC, the Company shall not be
in breach of its obligation to register Registrable  Securities pursuant to this
Agreement if, and only, if during the  effectiveness of this Agreement  (whether
or not a Request is pending) the Company is using its best efforts to remedy the
condition  giving rise to such  limitations  expressed in the No-Action  Letter,
which "best efforts"  shall include,  but not be limited to, (a) as described in
the Company's  request for the No-Action  Letter,  procuring and filing with the
SEC as part of a  report  on Form  8-K  filed by the  Company  (with  amendments
thereto)  not later than 45 days after the date of this  Agreement  the  audited
balance sheets of the Chemical  Services  Division of  Safety-Kleen  Corp.  (the
"CSD") as of the  completion  of the CSD's  fiscal  years ended August 31, 2001,
2000, and 1999, (b) seeking further  effective  waivers or no-action  relief (to
the extent, if any, then required) from the SEC no later than the earlier of (i)
the date  thirty  (30) days  after a  Request  is made to  register  Registrable
Securities  and (ii) 90 days after the date of the next  fiscal  year end of the
Company (and, to the extent such relief is not granted,  seeking such waivers or
no-action relief on a no less frequent basis than annually  following each prior
request  until such  relief is  granted),  to the effect  that the  Company  may
register  the  Registrable  Securities  with the SEC without  compliance  by the
Company with the requirement to file historical audited financial statements for
the CSD,  (c) taking  such  other  actions as are  reasonably  requested  by the
Holders or that would  otherwise  reasonably be expected to allow the Company to
register Registrable Securities without complying with SEC rules and regulations
concerning the filing of historical audited financial statements for the CSD.

          3. HOLDBACK ARRANGEMENTS.

               3.1.  Restrictions on Sale by  Holders of Registrable Securities.
Each Holder of Registrable Securities agrees, by acquisition of such Registrable
Securities,  if  timely  requested  in  writing  by the  sole or  lead  managing
Underwriter,  not to make any short  sale of,  loan,  grant any  option  for the
purchase of or effect any public sale or  distribution,  of any of the Company's
equity  securities  (or  any  security   convertible  into  or  exchangeable  or
exercisable for any of the Company's equity  securities)  during the time period
reasonably  requested by the sole or lead managing  Underwriter not to exceed 90
days, beginning on the effective date of the applicable  registration  statement
(except as part of such  underwritten  registration or pursuant to registrations
on Forms S-4 or S-8 or any  successor  form to such  forms),  unless the sole or
lead  Managing  Underwriter  in such  Underwritten  Offering  otherwise  agrees;
provided,  however,  that to the  extent the  Company or the sole lead  Managing
Underwriter  releases any Person from the foregoing  restrictions in whole or in
part it shall,  on the same day,  notify the Initial  Holder of such release and
such parties shall automatically be released to the same extent.

                                       13



                    3.2.  Restrictions on  Sale by the Company  and Others.  The
Company and McKim agree that if timely  requested in writing by the sole or lead
managing Underwriter in an Underwritten Offering of any Registrable  Securities,
not to make any short sale of,  loan,  grant any option for the  purchase  of or
effect any public sale or distribution of any of the Company's equity securities
(or any security  convertible into or exchangeable or exercisable for any of the
Company's equity securities) during the nine business days (as such term is used
in Rule 10b-6  under the  Exchange  Act)  prior to,  and during the time  period
reasonably  requested by the sole or lead managing  Underwriter not to exceed 90
days, beginning on the effective date of the applicable  registration  statement
(except as part of such  underwritten  registration or pursuant to registrations
on Forms S-4 or S-8 or any  successor  form to such  forms),  unless the sole or
lead Managing  Underwriter in such Underwritten  Offering  otherwise agrees. The
Company will use its  reasonable  best efforts to cause each director or officer
of the Company and each  holder of 5% or more of the equity  securities  (or any
security  convertible  into or exchangeable or exercisable for any of its equity
securities) of the Company purchased from the Company at any time after the date
of this  Agreement  (other than in a registered  public  offering or in a public
sale) to so agree.

          4.   REGISTRATION PROCEDURES.

               4.1. Obligations of the Company. Whenever the Company is required
to effect the  registration of Registrable  Securities  under the Securities Act
pursuant to Section 2 of this Agreement,  the Company shall, as expeditiously as
possible:

                    (a)  prepare  and file  with the  SEC (promptly, and  in any
event  within  60 days  after  receipt  of a  request  to  register  Registrable
Securities) the requisite  Registration  Statement to effect such  registration,
which  Registration  Statement shall comply as to form in all material  respects
with  the  requirements  of  the  applicable  form  and  include  all  financial
statements required by the SEC to be filed therewith,  and the Company shall use
its best efforts,  consistent with its obligations  under Section 2.7 hereof and
applicable law, to cause such Registration  Statement to become effective within
120  days  after  receipt  of a  request  to  register  Registrable  Securities;
provided,  that the Company may discontinue  any  registration of its securities
that are not Registrable  Securities,  and, under the circumstances specified in
Section 2.2, its securities  that are  Registrable  Securities.  Before filing a
Registration  Statement or Prospectus or any amendments or supplements  thereto,
or comparable  statements under securities or blue sky laws of any jurisdiction,
the Company  shall (i) provide  Holders'  Counsel  and any other  Inspector  (as
defined  below) with an adequate and  appropriate  opportunity to participate in
the  preparation of such  Registration  Statement and each  Prospectus  included
therein (and each amendment or supplement thereto or comparable statement) to be
filed with the SEC, which  documents  shall be subject to the review and comment
of  Holders'  Counsel,  and (ii) not file  any such  Registration  Statement  or
Prospectus (or amendment or supplement thereto or comparable statement) with the
SEC to which Holder's  Counsel,  any selling Holder or any other Inspector shall
have reasonably  objected on the grounds that such filing does not comply in all
material respects with the requirements of the Securities Act or of the rules or
regulations thereunder;

                    (b)  prepare and  file with  the  SEC  such  amendments  and
supplements to such Registration Statement and the Prospectus used in connection

                                       14



therewith as may be necessary (i) to keep such Registration Statement effective,
and (ii) to comply with the provisions of the Securities Act with respect to the
disposition  of  all  Registrable   Securities   covered  by  such  Registration
Statement,  in each case until such time as all of such  Registrable  Securities
have been disposed of in accordance with the intended  methods of disposition by
the seller(s) thereof set forth in such Registration Statement;

                    (c)  furnish, without charge, to each selling Holder of such
Registrable  Securities and each Underwriter,  if any, of the securities covered
by such  Registration  Statement,  such  number of  copies of such  Registration
Statement,  each  amendment and  supplement  thereto (in each case including all
exhibits), and the Prospectus included in such Registration Statement (including
each  preliminary  Prospectus)  in  conformity  with  the  requirements  of  the
Securities Act, and other documents,  as such selling Holder and Underwriter may
reasonably  request in order to facilitate the public sale or other  disposition
of the Registrable  Securities  owned by such selling Holder (the Company hereby
consenting  to  the  use  in  accordance   with  applicable  law  of  each  such
Registration  Statement (or amendment or post-effective  amendment  thereto) and
each such Prospectus (or preliminary  prospectus or supplement  thereto) by each
such selling Holder of Registrable  Securities and the Underwriters,  if any, in
connection with the offering and sale of the Registrable  Securities  covered by
such Registration Statement or Prospectus);

                    (d)  prior to any public offering of Registrable Securities,
use its best efforts to register or qualify all Registrable Securities and other
securities covered by such Registration Statement under such other securities or
blue  sky  laws of such  jurisdictions  as any  selling  Holder  of  Registrable
Securities  covered by such Registration  Statement or the sole or lead managing
Underwriter,  if any, may  reasonably  request to enable such selling  Holder to
consummate the disposition in such  jurisdictions of the Registrable  Securities
owned by such selling Holder and to continue such  registration or qualification
in effect in each such jurisdiction for as long as such  Registration  Statement
remains in effect (including through new filings or amendments or renewals), and
do any and all other acts and things  which may be  necessary  or  advisable  to
enable  any  such  selling  Holder  to  consummate   the   disposition  in  such
jurisdictions of the Registrable Securities owned by such selling Holder;

                    (e)  use its  best efforts to  obtain  all other  approvals,
consents,  exemptions  or  authorizations  from such  governmental  agencies  or
authorities  as  may  be  necessary  to  enable  the  selling  Holders  of  such
Registrable  Securities  to  consummate  the  disposition  of  such  Registrable
Securities;

                    (f)  notify Holders'  Counsel, each  Holder  of  Registrable
Securities covered by such Registration  Statement and the sole or lead managing
Underwriter,  if any: (i) when the  Registration  Statement,  any  pre-effective
amendment,  the  Prospectus  or any  prospectus  supplement  related  thereto or
post-effective  amendment to the Registration Statement has been filed and, with
respect to the Registration Statement or any post-effective  amendment, when the
same  has  become  effective,  (ii)  of  any  request  by the  SEC or any  state
securities  or  blue  sky  authority  for   amendments  or  supplements  to  the
Registration  Statement  or the  Prospectus  related  thereto or for  additional
information,  (iii) of the issuance by the SEC of any stop order  suspending the
effectiveness of the  Registration  Statement or the initiation or threat of any
proceedings  for  that  purpose,  (iv)  of the  receipt  by the  Company  of any

                                       15



notification  with  respect  to  the  suspension  of  the  qualification  of any
Registrable  Securities  for sale under the  securities  or blue sky laws of any
jurisdiction  or the initiation of any  proceeding for such purpose,  (v) of the
existence of any fact of which the Company becomes aware or the happening of any
event  which  results in (A) the  Registration  Statement  containing  an untrue
statement of a material fact or omitting to state a material fact required to be
stated therein or necessary to make any statements therein not misleading or (B)
the  Prospectus  included in such  Registration  Statement  containing an untrue
statement of a material fact or omitting to state a material fact required to be
stated therein or necessary to make any statements  therein, in the light of the
circumstances  under which they were made, not  misleading,  (vi) if at any time
the  representations and warranties  contained in any underwriting  agreement in
respect of such offering cease to be true and correct in all material  respects,
and  (vii)  of the  Company's  reasonable  determination  that a  post-effective
amendment to a Registration  Statement would be appropriate or that there exists
circumstances  not yet  disclosed to the public  which make further  sales under
such   Registration   Statement   inadvisable   pending  such   disclosure   and
post-effective amendment; and, if the notification relates to an event described
in any of the clauses (ii) through  (vii) of this  Section  4.1(f),  the Company
shall  promptly  prepare  a  supplement  or  post-effective  amendment  to  such
Registration  Statement  or  related  Prospectus  or any  document  incorporated
therein  by  reference  or file any  other  required  document  so that (1) such
Registration Statement shall not contain any 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 and (2) as thereafter  delivered to
the  purchasers  of the  Registrable  Securities  being  sold  thereunder,  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 in the light of the circumstances  under which they were made
not misleading (and shall furnish to each such Holder and each  Underwriter,  if
any,  a  reasonable  number of  copies of such  Prospectus  so  supplemented  or
amended);  and if the notification relates to an event described in clause (iii)
of this Section 4.1(f), the Company shall take all reasonable action required to
prevent the entry of such stop order or to remove it if entered;

                    (g)  make available for  inspection by any selling Holder of
Registrable Securities,  any sole or lead managing Underwriter  participating in
any disposition  pursuant to such Registration  Statement,  Holders' Counsel and
any  attorney,  accountant  or other  agent  retained  by any such seller or any
Underwriter  (each, an "Inspector" and,  collectively,  the  "Inspectors"),  all
financial and other records, pertinent corporate documents and properties of the
Company  and any  subsidiaries  thereof  as may be in  existence  at  such  time
(collectively,  the  "Records")  as shall be  necessary,  in the opinion of such
Holders' and such Underwriters'  respective  counsel, to enable them to exercise
their due  diligence  responsibility  and to conduct a reasonable  investigation
within the  meaning  of the  Securities  Act,  and cause the  Company's  and any
subsidiaries'  officers,  directors and employees,  and the  independent  public
accountants of the Company,  to supply all information  reasonably  requested by
any such Inspectors in connection with such Registration Statement;

                    (h) obtain an opinion from the Company's counsel and a "cold
comfort"  letter from the  Company's  independent  public  accountants  who have
certified  the  Company's  financial  statements  included  or  incorporated  by
reference in such Registration  Statement, in each case dated the effective date
of  such  Registration   Statement  (and  if  such   registration   involves  an
Underwritten  Offering,  dated the date of the  closing  under the  underwriting

                                       16



agreement),  in  customary  form and covering  such  matters as are  customarily
covered by such opinions and "cold comfort" letters delivered to underwriters in
underwritten  public  offerings,  which  opinion and letter shall be  reasonably
satisfactory  to the  sole  or lead  managing  Underwriter,  if any,  and to the
Majority Holders of the Registration,  and furnish to each Holder  participating
in the  offering  and to each  Underwriter,  if any, a copy of such  opinion and
letter addressed to such Holder (in the case of the opinion) and Underwriter (in
the case of the opinion and the "cold comfort" letter);

                    (i)  provide a CUSIP number for  all Registrable  Securities
and provide and cause to be  maintained a transfer  agent and  registrar for all
such Registrable  Securities  covered by such  Registration  Statement not later
than the effectiveness of such Registration Statement;

                    (j)  otherwise  use  its  best  efforts to comply  with  all
applicable rules and regulations of the SEC and any other governmental agency or
authority  having  jurisdiction  over the  offering,  and make  available to its
security  holders,  as soon as reasonably  practicable but no later than 90 days
after the end of any 12-month  period,  an earnings  statement (i) commencing at
the end of any month in which Registrable Securities are sold to Underwriters in
an Underwritten Offering and (ii) commencing with the first day of the Company's
calendar month next  succeeding  each sale of Registrable  Securities  after the
effective date of a Registration  Statement,  which  statement  shall cover such
12-month periods, in a manner which satisfies the provisions of Section 11(a) of
the Securities Act and Rule 158 thereunder;

                    (k)  if  so  requested  by  the  Majority  Holders  of   the
Registration,  use its best efforts to cause all such Registrable  Securities to
be (i) duly included for quotation on the Nasdaq Stock Market's  National Market
(the "Nasdaq National  Market") or listed on the principal  national  securities
exchange  on  which  the  Company's  similar  securities  are  then  listed,  if
applicable, or (ii) if securities of the Company are not at the time included on
the Nasdaq National Market or listed on any national  securities exchange (or if
the listing of Registrable  Securities is not permitted  under the rules of each
national securities exchange on which the Company's securities are then listed),
on the National Nasdaq Market or a national  securities  exchange  designated by
the Majority Holders of the Registration;

                    (l)  enter into and perform customary agreements (including,
if  applicable,  an  underwriting  agreement  in  customary  form)  and  provide
officers' certificates and other customary closing documents;

                    (m)  cooperate  with  each  selling  Holder  of  Registrable
Securities  and  each  Underwriter  participating  in the  disposition  of  such
Registrable  Securities  and their  respective  counsel in  connection  with any
filings  required  to be made with the NASD and make  reasonably  available  its
employees  and  personnel and  otherwise  provide  reasonable  assistance to the
Underwriters  (taking into account the needs of the Company's businesses and the
requirements  of  the  marketing   process)  in  the  marketing  of  Registrable
Securities in any Underwritten Offering;

                    (n)  cooperate  with  the  selling  Holders  of  Registrable
Securities and the sole or lead managing Underwriter,  if any, to facilitate the

                                       17



timely  preparation  and delivery of  certificates  not bearing any  restrictive
legends  representing  the  Registrable  Securities  to be sold,  and cause such
Registrable Securities to be issued in such denominations and registered in such
names  in  accordance  with  the  underwriting  agreement  prior  to any sale of
Registrable  Securities to the Underwriters or, if not an Underwritten Offering,
in  accordance  with the  instructions  of the  selling  Holders of  Registrable
Securities  at least  three  business  days  prior  to any  sale of  Registrable
Securities;

                    (o)  keep each  selling  Holder  of  Registrable  Securities
advised in writing as to the initiation and progress of any  registration  under
Section 2 hereunder;

                    (p)  furnish to  each Holder participating  in the  offering
and the sole or lead managing Underwriter,  if any, without charge, at least one
manually-signed  copy  of the  Registration  Statement  and  any  post-effective
amendments thereto,  including financial statements and schedules, all documents
incorporated therein by reference and all exhibits (including those deemed to be
incorporated by reference);

                    (q)  if requested by the sole or  lead managing Underwriter,
if any, or any selling Holder of Registrable Securities, promptly incorporate in
a prospectus supplement or post-effective  amendment such information concerning
such Holder of Registrable  Securities,  the Underwriters or the intended method
of distribution  as the sole or lead managing  Underwriter or the selling Holder
of Registrable  Securities  reasonably requests to be included therein and as is
appropriate  in the  reasonable  judgment  of the  Company,  including,  without
limitation,  information with respect to the number of shares of the Registrable
Securities  being  sold to the  Underwriters,  the  purchase  price  being  paid
therefor  by such  Underwriters  and  with  respect  to any  other  terms of the
Underwritten Offering of the Registrable Securities to be sold in such offering;
make all  required  filings  of such  Prospectus  supplement  or  post-effective
amendment  as  soon  as  notified  of the  matters  to be  incorporated  in such
Prospectus  supplement  or  post-effective  amendment;  and  supplement  or make
amendments  to any  Registration  Statement  if  requested  by the  sole or lead
managing Underwriter of such Registrable Securities; and

                    (r)  use its best  efforts to take all other steps necessary
to expedite or facilitate the  registration  and  disposition of the Registrable
Securities contemplated hereby.

               4.2.  Seller Information.  The Company  may  require each selling
Holder of Registrable  Securities as to which any registration is being effected
to  furnish  to the  Company  such  information  regarding  such  seller and the
disposition of such  securities as the Company may from time to time  reasonably
request in writing; provided,  however, that such information shall be used only
in  connection  with  such  Registration.   If  any  Registration  Statement  or
comparable  statement  under  "blue  sky" laws  refers to any  Holder by name or
otherwise as the Holder of any securities of the Company, then such Holder shall
have the right to require (i) the  insertion  therein of  language,  in form and
substance  satisfactory  to such Holder and the Company,  to the effect that the
holding  by  such  Holder  of  such  securities  is  not  to be  construed  as a
recommendation  by  such  Holder  of the  investment  quality  of the  Company's
securities covered thereby and that such holding does not imply that such Holder
will assist in meeting any future financial requirements of the Company and (ii)

                                       18



in the event that such  reference  to such Holder by name or otherwise is not in
the judgment of the Company,  as advised by counsel,  required by the Securities
Act or any similar  federal  statute or any state "blue sky" or  securities  law
then in force, the deletion of the reference to such Holder.

               4.3.   Notice  to  Discontinue.    Each  Holder  of   Registrable
Securities  agrees by acquisition of such Registrable  Securities that, (a) upon
receipt of any notice from the Company of the happening of any event of the kind
described in Section 4.1(f)(ii) through 4.1(f)(vii), such Holder shall forthwith
discontinue  disposition of Registrable  Securities pursuant to the Registration
Statement  covering such  Registrable  Securities until such Holder's receipt of
the copies of the  supplemented  or amended  prospectus  contemplated by Section
4.1(f) and, (b) if so directed by the Company,  such Holder shall deliver to the
Company (at the Company's expense) all copies, other than permanent file copies,
then in such Holder's  possession,  of the Prospectus  covering such Registrable
Securities  which is  current  at the time of  receipt  of such  notice.  If the
Company  shall give any such notice,  the Company shall extend the period during
which such Registration Statement shall be maintained effective pursuant to this
Agreement  (including,  without  limitation,  the period  referred to in Section
4.1(b)) by the number of days during the period from and  including  the date of
the giving of such notice  pursuant to Section  4.1(f) to and including the date
when the Holder shall have  received the copies of the  supplemented  or amended
prospectus contemplated by and meeting the requirements of Section 4.1(f).

          5.  INDEMNIFICATION; CONTRIBUTION.

               5.1.   Indemnification  by  the Company.  The Company  agrees  to
indemnify and hold harmless, to the fullest extent permitted by law, each Holder
of  Registrable  Securities,  its  officers,   directors,   partners,   members,
shareholders,    employees,   Affiliates,   advisers,   attorneys   and   agents
(collectively,  "Agents") and each Person who controls  such Holder  (within the
meaning of the Securities Act) and its Agents with respect to each  registration
which has been effected pursuant to this Agreement,  against any and all losses,
claims,  damages  or  liabilities,  joint or  several,  actions  or  proceedings
(whether commenced or threatened) in respect thereof,  and expenses (as incurred
or suffered and including,  but not limited to, any and all expenses incurred in
investigating,  preparing or defending  any  litigation or  proceeding,  whether
commenced  or  threatened,  and the  reasonable  fees,  disbursements  and other
charges of legal counsel) in respect thereof (collectively,  "Claims"),  insofar
as such  Claims  arise out of or are based  upon any  untrue or  alleged  untrue
statement  of a  material  fact  contained  in  any  Registration  Statement  or
Prospectus  (including  any  preliminary,  final or summary  prospectus  and any
amendment  or  supplement  thereto)  related  to any  such  registration  or any
omission  or alleged  omission  to state a material  fact  required to be stated
therein or  necessary  to make the  statements  therein not  misleading,  or any
violation  by the  Company  of the  Securities  Act or any  rule  or  regulation
thereunder applicable to the Company and relating to action or inaction required
of the Company in connection with any such registration, or any qualification or
compliance  incident thereto;  provided,  however,  that the Company will not be
liable in any such case to the extent that any such  Claims  arise out of or are
based upon any untrue  statement or alleged untrue  statement of a material fact
or omission or alleged  omission of a material fact so made in reliance upon and
in  conformity  with  written  information  furnished to the Company by a Holder
expressly for use therein.  The Company shall also indemnify any Underwriters of
the Registrable  Securities,  their Agents and each Person who controls any such

                                       19



Underwriter  (within  the meaning of the  Securities  Act) to the same extent as
provided above with respect to the indemnification of the Holders of Registrable
Securities.  Such indemnity shall remain in full force and effect  regardless of
any  investigation  made by or on behalf of any  Person who may be  entitled  to
indemnification  pursuant to this  Section 5 and shall  survive the  transfer of
securities by such Holder or Underwriter.

               5.2.  Indemnification by Holders.  Each  Holder,  if  Registrable
Securities  held by it are included in the securities as to which a registration
is being  effected,  agrees to,  severally  and not jointly,  indemnify and hold
harmless, to the fullest extent permitted by law, the Company, its directors and
officers,  each other Person who  participates as an Underwriter in the offering
or sale of such  securities  and its Agents and each  Person  who  controls  the
Company  (within  the  meaning  of either  Section 15 of the  Securities  Act of
Section 20 of the  Exchange  Act)  against any and all  Claims,  insofar as such
Claims arise out of or are based upon any untrue or alleged untrue  statement of
a material fact contained in any Registration Statement or Prospectus (including
any  preliminary,  final or summary  prospectus  and any amendment or supplement
thereto)  related to such  registration,  or any omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements  therein not misleading,  to the extent,  but only to the extent,
that such untrue  statement or alleged  untrue  statement or omission or alleged
omission was made in reliance  upon and in conformity  with written  information
furnished  to the  Company  by a Holder  expressly  for use  therein;  provided,
however,  that the  aggregate  amount which any such Holder shall be required to
pay pursuant to this Section 5.2 shall in no event be greater than the amount of
the net  proceeds  received  by such  Holder  upon the  sale of the  Registrable
Securities  pursuant to the  Registration  Statement  giving rise to such Claims
less all amounts previously paid by such Holder with respect to any such Claims.
Such  indemnity  shall  remain  in  full  force  and  effect  regardless  of any
investigation  made  by or on  behalf  of any  Person  who  may be  entitled  to
indemnification  pursuant to this  Section 5 and shall  survive the  transfer of
securities by such Holder or Underwriter.

               5.3.  Conduct  of  Indemnification  Proceedings.  Promptly  after
receipt by an indemnified  party of notice of any Claim or the  commencement  of
any  action  or  proceeding  involving  a  Claim  under  this  Section  5,  such
indemnified party shall, if a claim in respect thereof is to be made against the
indemnifying  party pursuant to Section 5, (a) notify the indemnifying  party in
writing of the Claim or the commencement of such action or proceeding; provided,
that the  failure of any  indemnified  party to provide  such  notice  shall not
relieve the indemnifying  party of its obligations  under this Section 5, except
to the extent the  indemnifying  party is  materially  and  actually  prejudiced
thereby and shall not relieve the indemnifying party from any liability which it
may have to any  indemnified  party otherwise than under this Section 5, and (b)
permit such indemnifying  party to assume the defense of such claim with counsel
reasonably  satisfactory to the indemnified party;  provided,  however, that any
indemnified  party  shall  have the  right to  employ  separate  counsel  and to
participate  in the  defense of such  claim,  but the fees and  expenses of such
counsel  shall  be at the  expense  of such  indemnified  party  unless  (i) the
indemnifying party has agreed in writing to pay such fees and expenses, (ii) the
indemnifying  party  shall have  failed to assume the  defense of such claim and
employ counsel reasonably  satisfactory to such indemnified party within 20 days
after receiving  notice from such indemnified  party that the indemnified  party
believes it has failed to do so, or (C) in the  reasonable  judgment of any such
indemnified  party,  based upon advice of counsel,  a conflict of interest shall
exist between such indemnified party and the indemnifying  party with respect to

                                       20



such claims; it being  understood,  however,  that the indemnifying  party shall
not,  in  connection  with any one such  action or  separate  but  substantially
similar or  related  actions in the same  jurisdiction  arising  out of the same
general  allegations or  circumstances,  be liable for the  reasonable  fees and
expenses of more than one  separate  firm of  attorneys  (in addition to no more
than one firm of local counsel) at any time for all such indemnified parties. No
indemnifying  party  shall be liable  for any  settlement  of any such  claim or
action  effected  without  its  written  consent,  which  consent  shall  not be
unreasonably  withheld.  No indemnifying party shall, without the consent of the
indemnified party, which consent shall not be unreasonable withheld,  consent to
entry of any  judgment  or enter into any  settlement  of any claim or action in
respect of which indemnification or contribution may be sought hereunder, unless
such settlement,  (x) includes an unconditional release of the indemnified party
from all liability  arising out of such action or claim,  (y) does not include a
statement as to or an admission of fault, culpability or a failure to act, by or
on behalf of any indemnified  party,  and (z) does not provide for any action on
the part of any party  other than the  payment of money  damages  which is to be
paid in full by the indemnifying party.

               5.4. Contribution. If the indemnification provided for in Section
5.1 or 5.2 from the  indemnifying  party for any reason is unavailable to (other
than by reason of  exceptions  provided  therein),  or is  insufficient  to hold
harmless  an  indemnified  party  hereunder  in respect  of any Claim,  then the
indemnifying  party,  in lieu of  indemnifying  such  indemnified  party,  shall
contribute to the amount paid or payable by such  indemnified  party as a result
of such Claim in such proportion as is appropriate to reflect the relative fault
of the  indemnifying  party, on the one hand, and the indemnified  party, on the
other hand, in connection with the actions which resulted in such Claim, as well
as any other  relevant  equitable  considerations.  The  relative  fault of such
indemnifying  party and  indemnified  party shall be determined by reference to,
among other  things,  whether any action in  question,  including  any untrue or
alleged untrue  statement of a material fact or omission or alleged  omission to
state a material fact, has been made by, or relates to information  supplied by,
such indemnifying  party or indemnified party, and the parties' relative intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
action.  If,  however,  the foregoing  allocation is not permitted by applicable
law, then each indemnifying party shall contribute to the amount paid or payable
by such  indemnified  party in such  proportion as is appropriate to reflect not
only such  relative  faults but also the relative  benefits of the  indemnifying
party  and  the  indemnified  party  as  well as any  other  relevant  equitable
considerations.

               5.5.    Indemnification  Payments.    The   indemnification   and
contribution  required by this  Section 5 shall be made by periodic  payments of
the amount thereof  during the course of any  investigation  or defense,  as and
when bills are received or any expense, loss, damage or liability is incurred.

               5.6.  Other Indemnification.   Indemnification  similar  to  that
specified in the preceding Sections 5.1 and 5.2 (with appropriate modifications)
shall be given by the Company and each selling Holder of Registrable  Securities
with respect to any required  registration or other  qualification of securities
under any  Federal or state law or  regulation  of any  governmental  authority,
other than the Securities Act. The 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.

                                       21



          6. General Provisions Regarding Registrations.

               6.1.  Adjustments Affecting Registrable Securities.  The  Company
agrees  that it  shall  not  effect  or  permit  to  occur  any  combination  or
subdivision of shares which would adversely  affect the ability of the Holder of
any  Registrable  Securities  to  include  such  Registrable  Securities  in any
registration  contemplated  by  this  Agreement  or the  marketability  of  such
Registrable Securities in any such registration.

               6.2.  Registration Rights to Others.  The Company  represents and
warrants that, except as set forth in the Subordinated Note Holder  Registration
Rights  Agreement,  as in effect as of the date  hereof,  a true,  complete  and
correct copy of which has been delivered to each of the Initial  Holders,  it is
not currently a party to any agreement with respect to its  securities  granting
registration  rights to  Persons.  If the  Company  shall at any time  hereafter
provide to any holder of any  securities  of the Company  rights with respect to
the  registration of such  securities  under the Securities Act, (i) such rights
shall not be in conflict with or adversely  affect any of the rights provided in
this  Agreement  to the Holders and (ii) if such rights are provided on terms or
conditions more favorable to such holder than the terms and conditions  provided
in this  Agreement,  the  Company  shall  provide (by way of  amendment  to this
Agreement or otherwise) such more favorable terms or conditions to the Holders.

               6.3.  Availability of  Information;  Rule 144;  Rule 144A;  Other
Exemptions. The Company covenants that it shall timely file any reports required
to be filed by it under the Securities Act or the Exchange Act  (including,  but
not limited  to, the reports  under  Sections 13 and 15(d) of the  Exchange  Act
referred to in subparagraph  (c) of Rule 144 under the Securities Act), and that
it shall take such further  action as any Holder of  Registrable  Securities may
reasonably request,  all to the extent required from time to time to enable such
Holder to sell Registrable  Securities without registration under the Securities
Act within the  limitation of the  exemptions  provided by (i) Rule 144 and Rule
144A under the  Securities  Act, as such rules may be amended from time to time,
or (ii) any other rule or  regulation  now existing or hereafter  adopted by the
SEC. Upon the request of any Holder of Registrable Securities, the Company shall
deliver to such Holder a written  statement as to whether it has  complied  with
such requirements.

          7.   PROVISIONS APPLICABLE TO SECURITYHOLDERS.

               7.1.  General Restriction. McKim may not, directly or indirectly,
sell, assign, transfer, pledge, bequeath, hypothecate, mortgage, grant any proxy
with  respect  to,  or in  any  other  way  encumber  or  otherwise  dispose  of
("Convey"), any shares of Common Stock except pursuant to the provisions of this
Article 7.

               7.2.  Right of Co-Sale.  (a) If McKim desires to Convey shares of
Common Stock to any Person (the  "Purchaser"),  each Holder shall have the right
to require, as a condition to such Conveyance,  that the Purchaser purchase from
such Holder at the same price and on the same terms and  conditions  as involved
in such sale or disposition by McKim (the "Purchase Offer") the number of shares
of Common Stock owned by such Holder equal to the aggregate  number of shares of

                                       22



Common Stock proposed to be purchased by the Purchaser from McKim  multiplied by
a fraction,  the numerator of which is the number of shares of Common Stock held
of record by such Holder and the denominator of which is the aggregate number of
shares of Common  Stock held of record by McKim and the  Holders.  The amount of
shares of Common  Stock that each Holder is entitled to sell under this  Section
7.2 shall be referred to as its "Pro Rata  Share".  McKim shall  deliver to each
Holder  not more  than 60 days and not less than 30 days  prior to the  proposed
Conveyance to the Purchaser a copy of the Purchase Offer,  if in writing,  and a
description of all other  material  terms and conditions of the Purchase  Offer.
Within 25 days after receipt of the Purchase  Offer,  a Holder shall give notice
to McKim of its  intent to sell all or a portion of its Pro Rata  Share.  In the
event that a Holder shall elect to participate in any such sale or  disposition,
such Holder shall  communicate in writing such election to participate to McKim,
which  communication shall be delivered to McKim pursuant to Section 8.2 hereof,
and the  number  of  shares  of  Common  Stock  to be  Conveyed  by McKim to the
Purchaser shall be reduced accordingly.

                    (b)  McKim and  each  participating  Holder  may, up to  and
including 90 days after but not until at least 60 days after McKim's delivery of
the  notice of the  Purchase  Offer to the  Holders,  Convey any or all of their
shares  of  Common  Stock to the  Purchaser,  in  quantities  and on  terms  and
conditions no more favorable in any material  respect to those  specified in the
Purchase Offer or otherwise disclosed to the Holders,  and the Holders shall not
have the right to require  that the  Purchaser  purchase  any of their shares of
Common Stock as to which they did not exercise their co-sale  rights  hereunder.
If such sale is not  consummated  by the  expiration of such 90 day period,  the
restrictions provided for herein shall again become effective, and no Conveyance
of such shares of Common Stock may be made  thereafter  by McKim  without  again
complying with the requirements of this Section 7.2.

                    (c)  The closing  of any sale of  the shares of Common Stock
by the Holders  and/or  McKim  pursuant to this Section 7.2 shall be held at the
Company's  principal  office at 10:00 a.m.,  local  time,  no later than 30 days
after  the dates of  expiration  of the right to sell  referred  to in  Sections
7.2(a) and 7.2(b) hereof,  or at such other time and place as the parties to the
transaction  may agree.  At such  closing,  each  Holder  (if it has  elected to
participate  in accordance  with this Section 7.2) and/or McKim shall Convey all
the shares of Common Stock  purchased by the Purchaser  pursuant to this Section
7.2 free and clear of any Encumbrances  (other than restrictions  imposed by the
organizational  documents of the Company,  including  without  limitation,  this
Agreement,  and pursuant to applicable  federal and state securities  laws), and
each such  Holder  and/or  McKim shall so  represent  and  warrant,  and further
represent and warrant that it is the record and beneficial  owner of such shares
of Common Stock.  The Purchaser  shall deliver at such closing,  in cash by wire
transfer  of  immediately  available  funds,  payment in full to the each of the
Holders and/or McKim for its  respective  portion of such shares of Common Stock
sold.

                    (d)  The election  by a Holder  not to  exercise its  rights
under this Section 7.2 in any one  instance  shall not affect the rights of that
Holder as to any  subsequent  proposed  Conveyance by McKim.  Any  Conveyance by
McKim of any of its shares of Common Stock  without first giving the Holders the
rights described in this Section 7.2 shall be void and of no force or effect.

               7.3.  Permitted Transfers.  Subject to the final  proviso of this
paragraph,  the  provisions  of  Section  7.1  or 7.2  shall  not  apply  to the

                                       23



Conveyance of Common Stock by McKim (a) in a public  offering  registered  under
the Securities Act; provided; that the Holders shall have had the opportunity to
participate  in such offering,  without  limitation on the number of Registrable
Securities  covered thereby,  in accordance with Section 2 hereof, (b) in a sale
pursuant to Rule 144 of the  Securities  Act, (c) pursuant to a bona fide pledge
of the Common Stock to a nationally recognized financial institution as security
for a bona  fide  financing  arrangement  by  McKim  and  (d) to any one or more
persons  or  entities  each of which is a  "Permitted  Holder"  as such  term is
defined in the  Certificate  of Designation in respect of the Series C Preferred
Stock (collectively  "Permitted Family  Transferees");  provided,  however, that
such  Permitted  Family  Transferee(s)  shall take such  shares of Common  Stock
subject to and be fully  bound by this  Agreement  with the same effect as if it
were a party hereto and shall execute and deliver to the Company and each Holder
an instrument of accession and such  additional  documentation  as the Company's
Board of Directors and the Holders may reasonably require to bind such Permitted
Family  Transferee in the same manner that McKim is bound under this  Agreement,
and  references  herein to McKim shall be deemed to include  any such  Permitted
Family Transferee(s).

          8. General.

               8.1.  Amendments and Waivers.  The provisions of  this Agreement,
including  the  provisions  of  this  sentence,  may not be  amended,  modified,
supplemented  or  terminated,  and waivers or consents  to  departures  from the
provisions  hereof may not be given,  without the written consent of the Company
and the Majority Holders and if adverse to McKim, McKim; provided, however, that
no such  amendment,  modification,  supplement,  waiver or consent to  departure
shall reduce the aforesaid  percentage  of  Registrable  Securities  without the
written  consent of all of the Holders of Registrable  Securities;  and provided
further,  that  nothing  herein  shall  prohibit  any  amendment,  modification,
supplement,  termination,  waiver or consent to departure the effect of which is
limited only to those Holders who have agreed to such  amendment,  modification,
supplement, termination, waiver or consent to departure.

               8.2.  Notices.  All notices and other communications provided for
or permitted  hereunder  shall be made in writing by hand delivery,  telecopier,
any  courier  guaranteeing  overnight  delivery  or first  class  registered  or
certified mail,  return receipt  requested,  postage  prepaid,  addressed to the
applicable  party at the address  set forth  below or such other  address as may
hereafter  be  designated  in  writing  by such  party to the other  parties  in
accordance with the provisions of this Section:

                  If to the Company:        Clean Harbors, Inc.
                                            1501 Washington Street
                                            Braintree, MA  02185
                                            Attn:  Chief Financial Officer
                                            Fax No. (781) 848-1632

                  with copies to:           Davis, Malm & D'Agostine, P.C.
                                            One Boston Place
                                            Boston, MA 02108
                                            Attn: C. Michael Malm
                                            Fax No. (617) 523-6215

                                       24



                  If to McKim:              Alan S. McKim
                                            c/o Clean Harbors, Inc.
                                            1501 Washington Street
                                            Braintree, MA  02185
                                            Fax No. (781) 848-1632

                  with copies to:           Davis, Malm & D'Agostine, P.C.
                                            One Boston Place
                                            Boston, MA 02108
                                            Attn: C. Michael Malm
                                            Fax No. (617) 523-6215


          If to a Holder, to its address and facsimile set forth on the Schedule
of Holders attached hereto, with copies to such Holder's  representatives as set
forth on the  Schedule of Holders,  or to such other  address  and/or  facsimile
number and/or to the  attention of such other person as the recipient  party has
specified by written notice given to each other party five (5) days prior to the
effectiveness  of  such  change.  All  such  notices  and  communications   (and
deliveries)  shall be deemed to have been duly given:  at the time  delivered by
hand, if personally delivered;  when receipt is acknowledged,  if telecopied; on
the next business day, if timely delivered to a courier  guaranteeing  overnight
delivery;  and five days after being  deposited in the mail, if sent first class
or certified mail, return receipt requested, postage prepaid.

               8.3.  Successors and Assigns.  This Agreement shall  inure to the
benefit of and be binding upon the parties  hereto and their  respective  heirs,
successors and permitted assigns (including any permitted transferee of Series C
Preferred Stock Registrable Securities). Any Holder may assign to any transferee
of its  Series  C  Preferred  Stock  or  Registrable  Securities  (other  than a
transferee  that acquires  such  Registrable  Securities in a registered  public
offering  or  pursuant  to a sale under Rule 144 of the  Securities  Act (or any
successor  rule)),  its rights and obligations  under this Agreement;  provided,
however,  if any  transferee  shall take and hold  Series C  Preferred  Stock or
Registrable Securities, such transferee shall promptly notify the Company and by
taking  and  holding  such   Registrable   Securities  such   transferee   shall
automatically be entitled to receive the benefits of and be conclusively  deemed
to have agreed to be bound by and to perform all of the terms and  provisions of
this  Agreement as if it were a party hereto (and shall,  for all  purposes,  be
deemed a Holder under this Agreement). If the Company shall so request any heir,
successor or permitted assign  (including any permitted  transferee)  wishing to
avail itself of the benefits of this Agreement shall agree in writing to acquire
and hold the  Registrable  Securities  subject to all of the terms  hereof.  For
purposes  of this  Agreement,  "successor"  for any entity  other than a natural
person  shall  mean a  successor  to such  entity as a result  of such  entity's
merger,  consolidation,  sale of  substantially  all of its  assets,  or similar
transaction.  Except as provided above or otherwise permitted by this Agreement,
neither this Agreement nor any right,  remedy,  obligation or liability  arising
hereunder or by reason hereof shall be assignable by any Holder, McKim or by the
Company without the consent of the other parties hereto.

                                       25



               8.4.  Counterparts. This Agreement may be executed in two or more
counterparts,  each of which, when so executed and delivered, shall be deemed to
be an original, but all of which counterparts,  taken together, shall constitute
one and the same instrument.

               8.5.  Descriptive Headings, Etc.  The headings in  this Agreement
are for  convenience of reference  only and shall not limit or otherwise  affect
the meaning of terms  contained  herein.  Unless the  context of this  Agreement
otherwise  requires:  (a) words of any gender  shall be deemed to  include  each
other  gender;  (b) words using the singular or plural number shall also include
the plural or singular number,  respectively;  (c) the words "hereof",  "herein"
and  "hereunder"  and words of similar import when used in this Agreement  shall
refer to this Agreement as a whole and not to any  particular  provision of this
Agreement,  and  Section  and  paragraph  references  are  to the  Sections  and
paragraphs  of  this  Agreement  unless  otherwise   specified;   (d)  the  word
"including"  and words of similar import when used in this Agreement  shall mean
"including,  without  limitation," unless otherwise  specified;  (e) "or" is not
exclusive; and (f) provisions apply to successive events and transactions.

               8.6.  Severability.  In the  event that  any  one or  more of the
provisions,  paragraphs,  words, clauses, phrases or sentences contained herein,
or the application  thereof in any  circumstances,  is held invalid,  illegal or
unenforceable  in any  respect  for  any  reason,  the  validity,  legality  and
enforceability  of any  such  provision,  paragraph,  word,  clause,  phrase  or
sentence  in  every  other  respect  and  of  the  other  remaining  provisions,
paragraphs,  words, clauses, phrases or sentences hereof shall not be in any way
impaired,  it being  intended  that all  rights,  powers and  privileges  of the
parties hereto shall be enforceable to the fullest extent permitted by law.

               8.7.  CHOICE OF LAW AND VENUE; JURY TRIAL WAIVER. THE VALIDITY OF
THIS AGREEMENT,  THE CONSTRUCTION,  INTERPRETATION,  AND ENFORCEMENT HEREOF, AND
THE RIGHTS OF THE PARTIES HERETO WITH RESPECT TO ALL MATTERS  ARISING  HEREUNDER
OR RELATED  HERETO SHALL BE  DETERMINED  UNDER,  GOVERNED  BY, AND  CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

          THE  PARTIES  AGREE  THAT  ALL  ACTIONS  OR  PROCEEDINGS   ARISING  IN
CONNECTION  WITH THIS  AGREEMENT  SHALL BE TRIED AND LITIGATED ONLY IN THE STATE
AND FEDERAL  COURTS  LOCATED IN THE COUNTY OF NEW YORK,  STATE OF NEW YORK.  THE
COMPANY,  MCKIM AND THE INITIAL  HOLDERS WAIVE,  TO THE EXTENT  PERMITTED  UNDER
APPLICABLE  LAW,  ANY RIGHT  EACH MAY HAVE TO ASSERT THE  DOCTRINE  OF FORUM NON
CONVENIENS  OR TO OBJECT TO VENUE TO THE  EXTENT  ANY  PROCEEDING  IS BROUGHT IN
ACCORDANCE WITH THIS SECTION 8.7.

               THE  COMPANY,  MCKIM AND  THE INITIAL  HOLDERS HEREBY WAIVE THEIR
RESPECTIVE  RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR
ARISING OUT OF THIS AGREEMENT OR ANY OF THE  TRANSACTIONS  CONTEMPLATED  HEREIN,
INCLUDING  CONTRACT CLAIMS,  TORT CLAIMS,  BREACH OF DUTY CLAIMS,  AND ALL OTHER
COMMON LAW OR  STATUTORY  CLAIMS.  EACH OF THE  COMPANY,  MCKIM AND THE  INITIAL

                                       26



HOLDERS  REPRESENT  THAT EACH HAS REVIEWED  THIS WAIVER AND EACH  KNOWINGLY  AND
VOLUNTARILY  WAIVES  ITS JURY TRIAL  RIGHTS  FOLLOWING  CONSULTATION  WITH LEGAL
COUNSEL. IN THE EVENT OF LITIGATION,  A COPY OF THIS AGREEMENT MAY BE FILED AS A
WRITTEN CONSENT TO A TRIAL BY THE COURT.

               8.8.   Remedies;  Specific  Performance.   The   parties   hereto
acknowledge  that money  damages  would not be an adequate  remedy at law if any
party fails to perform in any material respect any of its obligations hereunder,
and accordingly  agree that each party, in addition to any other remedy to which
it may be  entitled  at law or in equity,  shall be  entitled  to seek to compel
specific performance of the obligations of any other party under this Agreement,
without the posting of any bond, in accordance  with the terms and conditions of
this Agreement in any court  specified in Section 8.7 hereof,  and if any action
should be brought in equity to enforce any of the provisions of this  Agreement,
none of the parties  hereto  shall  raise the defense  that there is an adequate
remedy at law.  Except as  otherwise  provided  by law, a delay or omission by a
party hereto in  exercising  any right or remedy  accruing  upon any such breach
shall not impair the right or remedy or  constitute a waiver of or  acquiescence
in any such  breach.  No remedy  shall be  exclusive  of any other  remedy.  All
available remedies shall be cumulative.

               8.9. Entire Agreement. This Agreement and the Financing Agreement
and the Purchase Agreement  (collectively,  the "Other Agreements") are intended
by the parties as a final  expression  of their  agreement  and intended to be a
complete and  exclusive  statement of the  agreement  and  understanding  of the
parties hereto in respect of the subject matter contained  herein.  There are no
restrictions,  promises, representations,  warranties, covenants or undertakings
relating  to such  subject  matter,  other than those set forth or  referred  to
herein or in the  Other  Agreements.  This  Agreement  and the Other  Agreements
supersede all prior  agreements and  understandings  between the Company and the
other parties to this Agreement with respect to such subject matter.

               8.10.  Further Assurances. Each party hereto shall do and perform
or cause to be done and  performed  all such  further  acts and things and shall
execute and deliver all such other  agreements,  certificates,  instruments  and
documents as any other party hereto reasonably may request in order to carry out
the intent and accomplish the purposes of this Agreement and the consummation of
the transactions contemplated hereby.

               8.11.  Construction.  Each of the Company, McKim and  the Initial
Holders  acknowledge  that it has had the  benefit  of legal  counsel of its own
choice and has been afforded an  opportunity  to review this  Agreement with its
legal counsel and that this Agreement  shall be construed as if jointly  drafted
by the Company, McKim and the Initial Holders.

               8.12.   No Inconsistent Agreement.  Neither the Company nor McKim
will   hereafter   enter  into  any  agreement   which  is   inconsistent   with
the rights granted to the Holders in this Agreement.

               8.13.  Costs and Attorneys' Fees.  In  the event that any action,
suit or  other  proceeding  is  instituted  concerning  or  arising  out of this

                                       27



Agreement,  the Company, McKim and the Initial Holders agree that the prevailing
party shall recover from the non-prevailing party all of such prevailing party's
costs and  reasonable  attorneys'  fees  incurred in each and every such action,
suit or other proceeding, including any and all appeals or petitions therefrom.


     [Remainder of this page intentionally left blank.  Signature page follows.]





































                                       28




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


                                                THE COMPANY

                                                CLEAN HARBORS, INC.


                                                By:_____________________________
                                                    Name:
                                                    Title






                                                INITIAL HOLDERS

                                                CERBERUS CH LLC

                                                By:  Cerberus Partners, L.P.
                                                its Managing Member

                                                By:  Cerberus Associates, L.L.C.
                                                its General Partner

                                                By:_____________________________
                                                    Name:
                                                    Title:






                                        OAK HILL SECURITIES FUND, L.P.

                                        By:  Oak Hill Securities GenPar, L.P.
                                        its General Partner

                                        By:  Oak Hill Securities MGP, Inc.
                                        its General Partner

                                        By:_____________________________________
                                            Name:
                                            Title:


                                        OAK HILL SECURITIES FUND II, L.P.

                                        By:  Oak Hill Securities GenPar II, L.P.
                                        its General Partner

                                        By:  Oak Hill Securities MGP II, Inc.
                                        its General Partner

                                        By:_____________________________________
                                            Name:
                                            Title:


                                        LERNER ENTERPRISES, L.P.

                                        By:  Oak Hill Asset Management, Inc.
                                        As advisor and attorney-in-fact to
                                        Lerner Enterprises

                                        By:_____________________________________
                                            Name:
                                            Title:







                                         P&PK FAMILY LTD. PARTNERSHIP

                                         By:  Oak Hill Asset Management, Inc.
                                         As advisor and attorney-in-fact to
                                         P&PK Family Ltd. Partnership

                                         By:____________________________________
                                             Name:
                                             Title:


                                         CARDINAL INVESTMENT PARTNERS I, L.P.

                                         By:  As advisor and attorney-in-fact to
                                         Cardinal Investment Partners I, L.P.

                                         By:  Oak Hill Advisors MGP, Inc.
                                         its General Partner

                                         By:____________________________________
                                             Name:
                                             Title:






                                               MCKIM


                                                By:_____________________________
                                                    Name: Alan S. McKim

                                                Alan S. McKim's Children's Trust


                                                By:_____________________________
                                                    C. Michael Malm, Trustee

                                                By:_____________________________
                                                    Carol R. Cohen, Trustee





                               SCHEDULE OF HOLDERS

     Holder Address                          Investor's Representatives' Address
   and Facsimile Number                              and Facsimile Number

-----------------------------------------     ----------------------------------
     Cerberus CH LLC                               Schulte Roth & Zabel LLP
     450 Park Avenue, 28th Floor                   919 Third Avenue
     New York, NY 10022                            New York, NY  10022
     Telephone:  (212) 891-2100                    Attn:  Stuart Freedman, Esq.
     Facsimile:  (212) 891-1540                    Telephone:  (212) 756-2000
     Attention:  Daniel Wolf and Kevin Genda       Facsimile:  (212) 593-5955
     Oak Hill Securities Fund, L.P.                Paul, Weiss, Rifkind, Wharton
     65 East 55th Street                             & Garrison
     New York, New York 10022                      1285 Avenue of the Americas
     Telephone: (212) 326-1552                     New York, NY 10019
     Facsimile:  (212) 838-8411                    Telephone: (212) 373-3000
     Attention:  William H. Bohnsack, Jr.          Facsimile:  (212) 757-3990
                                                   Attention:  Eric Goodison

     Oak Hill Securities Fund II, L.P.             Paul, Weiss, Rifkind, Wharton
     65 East 55th Street                             & Garrison
     New York, New York 10022                      1285 Avenue of the Americas
     Telephone: (212) 326-1552                     New York, NY 10019
     Facsimile:  (212) 838-8411                    Telephone: (212) 373-3000
     Attention:  William H. Bohnsack, Jr.          Facsimile:  (212) 757-3990
                                                   Attention:  Eric Goodison

     Lerner Enterprises, L.P.                      Paul, Weiss, Rifkind, Wharton
     65 East 65th Street                             & Garrison
     New York, New York 10022                      1285 Avenue of the Americas
     Telephone: (212) 326-1552                     New York, NY 10019
     Facsimile:  (212) 838-8411                    Telephone: (212) 373-3000
     Attention:  William H. Bohnsack, Jr.          Facsimile:  (212) 757-3990
                                                   Attention:  Eric Goodison

     P&PK Family Ltd. Partnership                  Paul, Weiss, Rifkind, Wharton
     65 East 55th Street                             & Garrison
     New York, New York 10021                      1285 Avenue of the Americas
     Telephone: (212) 326-1552                     New York, NY 10019
     Facsimile:  (212) 838-8411                    Telephone: (212) 373-3000
     Attention:  William H. Bohnsack, Jr.          Facsimile:  (212) 757-3990


     Cardinal Investment Partners I, L.P.          Paul, Weiss, Rifkind, Wharton
     65 East 55th Street                             & Garrison
     New York, New York 10021                      1285 Avenue of the Americas
     Telephone: (212) 326-1552                     New York, NY 10019
     Facsimile:  (212) 838-8411                    Telephone: (212) 373-3000
     Attention:  William H. Bohnsack, Jr.          Facsimile:  (212) 757-3990
                                                   Attention:  Eric Goodison






                                    EXHIBIT A

                             [SEC NO-ACTION LETTER]






                                                                  Execution Copy


                                VOTING AGREEMENT

          VOTING AGREEMENT, dated as of September 6, 2002 (this "Agreement"), by
the  stockholders  of Clean  Harbors,  Inc., a  Massachusetts  corporation  (the
"Company") listed on the signature pages hereto under the heading "Stockholders"
(each, a "Stockholder" and collectively,  the  "Stockholders"),  the Company and
the  investors   listed  on  the  signature   pages  hereto  under  the  heading
"Investors") (each, an "Investor" and collectively, the "Investors").

          WHEREAS,  the  Investors  and  the  Company  have  entered  into a (i)
Securities  Purchase  Agreement,  dated as of the date hereof  (the  "Securities
Purchase  Agreement"),  pursuant to which,  among other things,  the Company has
agreed to issue  and sell to the  Investors  and the  Investors  have  agreed to
purchase, 25,000 shares of Series C Convertible Preferred Stock, par value $0.01
per share,  of the Company  (collectively,  the "Preferred  Shares") and (ii) an
Investors Rights  Agreement,  dated as of the date hereof (the "Investors Rights
Agreement"),  pursuant to which the Company has agreed,  among other things,  to
provide to the Investors certain registration rights under the Securities Act of
1933,  as amended  (the "1933  Act") and the rules and  regulations  promulgated
thereunder and applicable state securities laws and one of the Stockholders has,
among other things, agreed to grant the Investors certain rights to tag-along to
sales of  Company  Common  Stock (as  defined  below) by such  Stockholder  (the
transactions contemplated by the Securities Purchase Agreement and the Investors
Rights Agreement collectively referred to herein as the "Transaction");

          WHEREAS,  as of the date hereof,  the  Stockholders  own  collectively
4,391,762  shares of common  stock,  par value  $0.01 per share,  of the Company
("Company Common Stock"), which represent in the aggregate  approximately 36% of
the  total  issued  and  outstanding   Common  Stock  on  a  primary  basis  and
approximately  32% of  the  total  issued  and  outstanding  Common  Stock  on a
fully-diluted basis; and

          WHEREAS,  as a condition to the  willingness of the Investors to enter
into the Transaction,  the Investors have required that the Stockholders  agree,
and in order to induce  the  Investors  to enter  into the  Securities  Purchase
Agreement,  the  Stockholders  have agreed,  to enter into this  Agreement  with
respect  to all the  shares  of  Company  Common  Stock  now owned and which may
hereafter  be  acquired  by  the  Stockholders  (the  "Shares")  and  any  other
securities,  if any, which the  Stockholders are entitled to vote at any meeting
of stockholders of the Company (the "Other Securities").

          NOW,  THEREFORE,  in  consideration  of the  foregoing  and the mutual
covenants and  agreements  contained  herein,  and intending to be legally bound
hereby, the parties hereto hereby agree as follows:


                                    ARTICLE I

                            PROXY OF THE STOCKHOLDERS

          SECTION 1.01. Voting Agreement. Each Stockholder hereby agrees that at
any meeting of the  stockholders  of the  Company,  however  called,  and in any
action by consent of the Company, each of the Stockholders shall vote the Shares
and  the  Other  Securities:  (a)  in  favor  of  any  matters  relating  to the



Transaction,  the Securities  Purchase  Agreement (as amended from time to time)
and the Investors  Rights Agreement (as amended from time to time) or any of the
transactions  contemplated  by such  agreements  and the  Certificate of Vote of
Directors  Establishing a Series of a Class of Stock in respect of the Preferred
Shares (the  "Certificate"),  including,  without limitation the issuance to the
Investors of a number of shares of Company Common Stock issuable upon conversion
of the Preferred  Shares  greater in the aggregate  than 19.99% of the number of
shares of Company Common Stock outstanding immediately prior to the Closing Date
(as defined in the Securities  Purchase  Agreement)  pursuant to applicable law,
the  rules of the NASD and any  other  rules and  regulations  of the  Principal
Market (as defined in the Securities  Purchase  Agreement);  and (b) against any
proposal  or any other  corporate  action or  agreement  that would  result in a
breach of any covenant,  representation  or warranty or any other  obligation or
agreement of the Company under the Securities Purchase Agreement,  the Investors
Rights Agreement, the Certificate or which could result in any of the conditions
to the  Company's  obligations  under the  Securities  Purchase  Agreement,  the
Investors  Rights  Agreement  or  the  Certificate  not  being  fulfilled.  Each
Stockholder acknowledges receipt and review of a copy of the Securities Purchase
Agreement, the Investors Rights Agreement and the Certificate.

          SECTION 1.02.  Irrevocable  Proxy. Each Stockholder hereby irrevocably
appoints  each of Kevin  Genda,  Daniel  Wolf and  William  Bohnsack,  until the
termination  of this  Agreement,  as his or its attorney  and proxy  pursuant to
Massachusetts law and all applicable  provisions of the General  Corporation Law
of the State of  Massachusetts,  with full  power of  substitution,  to vote and
otherwise act (by written  consent or otherwise)  with respect to the Shares and
the Other Securities,  which such Stockholder is entitled to vote at any meeting
of stockholders of the Company  (whether annual or special and whether or not an
adjourned  or  postponed  meeting)  or  consent  in lieu of any such  meeting or
otherwise,  on the matters and in the manner  specified  in Section 1.01 hereof.
THIS PROXY AND POWER OF ATTORNEY IS  IRREVOCABLE  AND COUPLED  WITH AN INTEREST.
The  Stockholders  hereby  revoke all other  proxies and powers of attorney with
respect to the Shares and the Other  Securities  which they may have  heretofore
appointed  or granted,  and no  subsequent  proxy or power of attorney  shall be
given or  written  consent  executed  (and if given or  executed,  shall  not be
effective) by the Stockholders  with respect to the matters specified in Section
1.01 hereof.  All  authority  herein  conferred or agreed to be conferred  shall
survive the death or incapacity  of any  Stockholder  and any  obligation of any
Stockholder  under  this  Agreement  shall be binding  upon the heirs,  personal
representatives and successors or assigns of such Stockholder.

                                   ARTICLE II

               REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDERS

          Each  Stockholder  hereby  represents and warrants,  severally but not
jointly, to the Investors as follows:

          SECTION 2.01.  Authority Relative to This Agreement.  Each Stockholder
has all necessary power and authority to execute and deliver this Agreement,  to
perform his or its  obligations  hereunder  and to consummate  the  transactions
contemplated hereby. This Agreement has been duly executed and delivered by such
Stockholder  and  constitutes  a legal,  valid and  binding  obligation  of such
Stockholder, enforceable against such Stockholder in accordance with its terms.

                                       2



          SECTION  2.02.  No Conflict.  (a) The  execution  and delivery of this
Agreement by such  Stockholder do not, and the  performance of this Agreement by
such Stockholder  shall not, (i) conflict with or violate any federal,  state or
local law,  statute,  ordinance,  rule,  regulation,  order,  judgment or decree
applicable to such  Stockholder  or by which the Shares or the Other  Securities
owned by such  Stockholder are bound or affected or (ii) result in any breach of
or  constitute  a default (or an event that with notice or lapse of time or both
would  become a default)  under,  or give to others  any rights of  termination,
amendment,  acceleration or cancellation of, or result in the creation of a lien
or  encumbrance  on any of the  Shares  or the  Other  Securities  owned by such
Stockholder  pursuant  to,  any  note,  bond,  mortgage,  indenture,   contract,
agreement,  lease, license,  permit, franchise or other instrument or obligation
to which such  Stockholder is a party or by which such Stockholder or the Shares
or Other Securities owned by such Stockholder are bound or affected.

          (b) The execution and delivery of this  Agreement by such  Stockholder
do not, and the  performance  of this Agreement by such  Stockholder  shall not,
require any  consent,  approval,  authorization  or permit of, or filing with or
notification to, any governmental entity.

          SECTION  2.03.  Title  to the  Shares.  As of the  date  hereof,  each
Stockholder  is the  beneficial  owner of the number of shares of Company Common
Stock set forth opposite such  Stockholder's  name on Appendix A hereto entitled
to vote, without  restriction,  on all matters brought before holders of Company
Common Stock,  which Shares  represent on the date hereof the  percentage of the
outstanding Company Common Stock set forth on such Appendix. Such Shares are all
the securities of the Company owned,  either of record or beneficially,  by such
Stockholder.  Such  Shares are owned free and clear of all  security  interests,
liens,  claims,  pledges,   options,   rights  of  first  refusal,   agreements,
limitations on such Stockholder's voting rights,  charges and other encumbrances
of any nature whatsoever.  Except as provided in this Agreement,  no Stockholder
has  appointed  or  granted  any  proxy,  which  appointment  or  grant is still
effective,  with  respect  to the  Shares  or  Other  Securities  owned  by such
Stockholder.

                                   ARTICLE III

                                    COVENANTS

          SECTION  3.01.  No  Disposition   or   Encumbrance  of  Shares.   Each
Stockholder  hereby  covenants and agrees that,  except as  contemplated by this
Agreement, such Stockholder shall not offer or agree to sell, transfer,  tender,
assign,  hypothecate or otherwise dispose of, grant a proxy or power of attorney
with  respect  to, or create or  permit to exist any  security  interest,  lien,
claim,  pledge,  option,  right of first refusal,  agreement,  limitation on any
Stockholder's  voting  rights,   charge  or  other  encumbrance  of  any  nature
whatsoever  with  respect  to  the  Shares  or  Other  Securities,  directly  or
indirectly,  initiate,  solicit or encourage  any person to take  actions  which
could  reasonably be expected to lead to the occurrence of any of the foregoing;
provided, that such Stockholder may assign, sell or transfer any Shares or Other
Securities  provided that any such recipient of such Shares or Other  Securities
has  delivered  to the Company and each  Investor a written  agreement in a form
reasonably  satisfactory  to the Investors that such recipient shall be bound by
and the Shares and/or Other  Securities so  transferred,  assigned or sold shall
remain subject to this Agreement.

          SECTION 3.02.  Company  Cooperation.  The Company hereby covenants and
agrees  that it will not  recognize  any  sale,  transfer,  tender,  assignment,

                                       3



hypothecation  or other  disposal of,  grant of proxy or power of attorney  with
respect to, or the creation or  permission  to exist of any  security  interest,
lien, claim,  pledge,  option,  right of first refusal,  agreement on any of the
Shares or Other  Securities  subject to this Agreement  unless the provisions of
Section 3.01 have been complied with. The Company agrees to use its best efforts
to ensure that at any time in which Stockholder Approval is required pursuant to
Section 4(f) of the  Securities  Purchase  Agreement,  it will cause  holders of
Company  Common  Stock  or  Other  Securities  representing  the  percentage  of
outstanding Company Common Stock required to vote in favor of the Transaction in
order for the Company to comply with its  obligations  under Section 4(f) of the
Securities  Purchase  Agreement  to  become  party to and bound by the terms and
conditions of this  Agreement  and the shares of Company  Common Stock and Other
Securites held by such holders to be subject to the terms and conditions of this
Agreement.

                                   ARTICLE IV

                                  MISCELLANEOUS

          SECTION 4.01.  Further  Assurances.  Each Stockholder will execute and
deliver all such further  documents  and  instruments  and take all such further
action as may be necessary in order to consummate the transactions  contemplated
hereby.

          SECTION  4.02.  Specific  Performance.  The parties  hereto agree that
irreparable  damage would occur in the event any provision of this Agreement was
not performed in accordance with the terms hereof and that any Investor (without
being joined by any other Investor) shall be entitled to specific performance of
the terms  hereof,  in  addition  to any other  remedy at law or in equity.  Any
Investor  shall be  entitled  to its  reasonable  attorneys'  fees in any action
brought to enforce this Agreement in which it is the prevailing party.

          SECTION 4.03. Entire Agreement.  This Agreement constitutes the entire
agreement  between the Investors,  the  Stockholders and the Company (other than
the  Securities  Purchase  Agreement and the Investors  Rights  Agreement)  with
respect to the subject  matter hereof and  supersedes  all prior  agreements and
understandings, both written and oral, among the Investors, the Stockholders and
the Company with respect to the subject matter hereof.

          SECTION 4.04.  Amendment.  This Agreement may not be amended except by
an instrument in writing signed by the parties hereto.

          SECTION  4.05.  Severability.  If any term or other  provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law,
or public policy,  all other  conditions and provisions of this Agreement  shall
nevertheless  remain in full force and effect so long as the  economic  or legal
substance of this Agreement is not affected in any manner materially  adverse to
any party. Upon such  determination that any term or other provision is invalid,
illegal or incapable of being  enforced,  the parties hereto shall  negotiate in
good faith to modify this  Agreement so as to effect the original  intent of the
parties as closely as possible in a mutually acceptable manner in order that the
terms of this Agreement remain as originally  contemplated to the fullest extent
possible.

          SECTION 4.06.  Governing Law. This Agreement shall be governed by, and
construed in accordance  with,  the laws of the  Commonwealth  of  Massachusetts
applicable  to contracts  executed in and to be performed in that  Commonwealth.
All actions and  proceedings  arising out of or relating to this Agreement shall

                                       4



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














































                                       5





          IN WITNESS WHEREOF, each Stockholder and the Company has duly executed
this Agreement.


                                         THE COMPANY:

                                         CLEAN HARBORS, INC.


                                         By:______________________________
                                             Name:
                                             Title:
Dated:  September 6, 2002









                                              STOCKHOLDERS:


Dated:  September 6, 2002                     __________________________________
                                              Name: Alan S. McKim


                                              Alan S. McKim Children's Trust


Dated:  September 6, 2002                     By:_______________________________
                                                  C. Michael Malm, Trustee

Dated:  September 6, 2002                     By:_______________________________
                                                  Carol R. Cohen, Trustee


Dated:  September 6, 2002                     __________________________________
                                              Name:  Stephen H. Moynihan



Agreed and Accepted
as of: September __, 2002:







INVESTORS:

CERBERUS CH LLC

By:  Cerberus Partners, L.P.
     its Managing Member

By:  Cerberus Associates, L.L.C.
     its General Partner

By:_____________________________
    Name:
    Title:







OAK HILL SECURITIES FUND, L.P.

By:  Oak Hill Securities GenPar, L.P.
     its General Partner

By:  Oak Hill Securities MGP, Inc.
     its General Partner

By:_________________________________
    Name:
    Title:


OAK HILL SECURITIES FUND II, L.P.

By:  Oak Hill Securities GenPar II, L.P.
     its General Partner

By:  Oak Hill Securities MGP II, Inc.
     its General Partner

By:___________________________________
    Name:
    Title:


LERNER ENTERPRISES, L.P.

By:  Oak Hill Asset Management, Inc.
     As advisor and attorney-in-fact to
     Lerner Enterprises

By:____________________________________
    Name:
    Title:







P&PK FAMILY LTD. PARTNERSHIP

By:  Oak Hill Asset Management, Inc.
     As advisor and attorney-in-fact to
     P&PK Family Ltd. Partnership

By:___________________________________
    Name:
    Title:


CARDINAL INVESTMENT PARTNERS I, L.P.

By:  As advisor and attorney-in-fact to
     Cardinal Investment Partners I, L.P.

By:  Oak Hill Advisors MGP, Inc.
     its General Partner

By:___________________________________
    Name:
    Title:







                                   APPENDIX A




                                                          Percentage of Common
Stockholder                             Shares          Stock Deemed Outstanding
-----------                             ------          ------------------------


Alan S. McKim                          4,231,762                 31.6%


C. Michael Malm and Carol R.              60,000                  0.4%
Cohen, Trustees of the Alan S.
McKim Children's Trust


Stephen H. Moynihan                      100,000                  0.8%











                                                                SRZ DRAFT 9/6/02


                        CERBERUS CAPITAL MANAGEMENT, L.P.
                           450 Park Avenue, 28th Floor
                               New York, NY 10022

                                September 6, 2002

Oak Hill Advisors, Inc.
65 East 55th Street
New York, New York 10022
Attention:  William Bohnsack

         Re:  Clean Harbors, Inc.

Gentlemen:

          We  refer  to  (i)  the  Securities  Purchase  Agreement  dated  as of
September 6, 2002 (as amended,  supplemented or otherwise  modified from time to
time,  the  "Securities  Purchase  Agreement"),  among Clean  Harbors,  Inc.,  a
Massachusetts corporation ("Clean Harbors"), Cerberus CH LLC, a Delaware limited
liability  company  ("Cerberus  CH") and certain of your  affiliates,  funds and
accounts over which you have control (collectively,  the "Oak Hill Purchasers"),
pursuant to which Cerberus CH and the Oak Hill  Purchasers are purchasing in the
aggregate  25,000 shares of Series C  Convertible  Preferred  Stock,  par value,
$0.01 per share,  of Clean Harbors (the "Preferred  Stock"),  (ii) the Investors
Rights  Agreement  dated as of September 6, 2002 (as  amended,  supplemented  or
otherwise modified from time to time, the "Investors Rights  Agreement"),  among
Clean Harbors, Cerberus CH, the Oak Hill Purchasers, Alan S. McKim ("McKim") and
the Alan S. McKim  Children's  Trust (the "Trust"),  (iii) the Voting  Agreement
dated as of September 6, 2002 (as amended,  supplemented  or otherwise  modified
from time to time, the "Voting  Agreement"),  among Clean Harbors,  Cerberus CH,
the Oak Hill  Purchasers,  Stephen  Moynihan,  McKim  and the Trust and (iv) the
Clean Harbors Certificate of Vote of Directors  Establishing a Series of a Class
of Stock dated as of September 6, 2002 (as  amended,  supplemented  or otherwise
modified from time to time, the  "Certificate," and together with the Securities
Purchase  Agreement,  the Investors Rights  Agreement and the Voting  Agreement,
collectively   the  "Transaction   Documents").   This  letter  sets  forth  our
understanding  with  respect  to certain  matters  concerning  ownership  of the
Preferred Shares.

          We agree, on behalf of Cerberus CH and any of our affiliates,  and any
funds and accounts  controlled  or advised by us or our  affiliates  that in the
future own shares of Preferred  Stock  (collectively,  "Cerberus"),  that for so
long as the Oak Hill Purchasers,  together with any of your affiliates and funds
and accounts which you or your  affiliates  control or advise that in the future
own shares of Preferred Stock (collectively "Oak Hill") own in the aggregate not
less than 25% of all outstanding  shares of Preferred  Stock,  that we will not,
and will not permit any Cerberus  entity to,  consent to any action  relating to
the  amendment of provisions or the waiver of rights of the holders of Preferred
Stock or the  obligations  of Clean Harbors under (i) Section  10(b),  (e), (i),
(k),  (l),  (m),  (n) and (o) (to the extent (o)  relates to the  aforementioned
subsections  (b), (e), (i), (k), (l), (m) and (n)) and Section 9(b) (so long as,
in the case of Section 9(b),  Oak Hill owns the  percentage  of the  outstanding
shares of Preferred Stock specified in such section) of the Certificate and (ii)
Section 7 of the Investors' Rights Agreement,  without the prior written consent
of Oak Hill, which consent shall not be unreasonably withheld.

          You  agree on  behalf  of Oak Hill  that for so long as  Cerberus  CH,
together with any of our affiliates,  funds and accounts that we control that in
the future own Preferred  Stock  (collectively  "Cerberus") own in the aggregate
not less than 25% of the outstanding  shares of Preferred  Stock,  that Oak Hill
will not,  and will not  permit any Oak Hill  entity  to,  consent to any action



relating to the  amendment of  provisions or the waiver of rights of the holders
of Preferred  Stock or the obligations of Clean Harbors under (i) Section 10(b),
(e),  (i),  (k),  (l),  (m),  (n)  and (o) (to the  extent  (o)  relates  to the
aforementioned  subsections  (b),  (e),  (i),  (k),  (l),  (m)  and  (n)) of the
Certificate and (ii) Section 7 of the Investors' Rights  Agreement,  without the
prior  written  consent of Cerberus,  which  consent  shall not be  unreasonably
withheld.

          Nothing  herein  shall or shall be deemed to  constitute  an agreement
between,  or impose any obligation on, Cerberus and Oak Hill with respect to our
respective  rights to vote on any  matter  subject  to a vote of all  holders of
securities of Clean Harbors as  contemplated  by Section 9(a) of the Certificate
or otherwise.

          The parties  hereto agree that  irreparable  damage would occur in the
event any  provision  of this letter was not  performed in  accordance  with the
terms  hereof and that each party shall be entitled to specific  performance  of
the terms  hereof,  in  addition to any other  remedy at law or in equity.  Each
party  shall also be entitled to its  reasonable  attorneys'  fees in any action
brought to enforce this letter in which it is the prevailing party.

          This  letter  constitutes  the entire  agreement  between  the parties
hereto (other than the Transaction Documents) with respect to the subject matter
hereof and supersedes all prior agreements and understandings,  both written and
oral, among the parties with respect to the subject matter hereof.

          This  letter may not be  amended  except by an  instrument  in writing
signed by the parties hereto.

          If any term or other  provision of this letter is invalid,  illegal or
incapable  of being  enforced  by any rule of law, or public  policy,  all other
conditions and provisions of this letter shall nevertheless remain in full force
and effect so long as the  economic  or legal  substance  of this  letter is not
affected in any manner materially  adverse to any party. Upon such determination
that any term or other  provision  is  invalid,  illegal or  incapable  of being
enforced, the parties hereto shall negotiate in good faith to modify this letter
so as to effect the  original  intent of the parties as closely as possible in a
mutually  acceptable  manner in order  that the terms of this  letter  remain as
originally contemplated to the fullest extent possible.

          This letter shall be governed by, and  construed in  accordance  with,
the laws of the State of New York applicable to contracts  executed in and to be
performed in that State. All actions and proceedings  arising out of or relating
to this letter  shall be heard and  determined  in any New York state or federal
court situated in the City of New York, Borough of Manhattan.

          This letter  shall not confer any rights or  remedies  upon any person
other than the parties  hereto and their  respective  successors and assigns who
shall be bound by the terms and conditions of this letter.





          Assuming  that this  letter  accurately  reflects  your  understanding
regarding  the matters  discussed  herein,  we would  appreciate it if you would
evidence  this by  signing  a copy of this  letter  in the  space  below  and by
returning a copy of it to me.

                                           Sincerely yours,

                                           CERBERUS CAPITAL MANAGEMENT, L.P.


                                           By:________________________________
                                             Name:
                                             Title:






CONSENTED AND AGREED TO
this 6th day of September, 2002

OAK HILL ADVISORS, INC.



By:___________________________
     Name:
     Title: