SCHEDULE 14A INFORMATION

                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )

    Filed by the Registrant /X/
    Filed by a party other than the Registrant / /

    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only
           (as permitted by Rule 14a-6(e)(2))
    / /  Definitive Proxy Statement
    /X/  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section 240.14a-11(c)
           or Section 240.14a-12

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                (Name of Registrant as Specified In Its Charter)

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    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

/X/  No fee required

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11.

    (1) Title of each class of securities to which transaction applies:

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    (2) Aggregate number of securities to which transaction applies:

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    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

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/ / Fee paid previously with preliminary materials.

/ / Check box if any part of the fee is offset as provided by Exchange Act
    Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
    paid previously. Identify the previous filing by registration statement
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                                CLEAN HARBORS, INC.

             THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned hereby appoints Alan S. McKim, Stephen H. Moynihan and 
C. Michael Malm, and each of them acting solely, with full power of 
substitution, as the true and lawful attorney-in-fact and proxy for the 
undersigned to vote all shares of Common Stock of Clean Harbors, Inc. (the 
"Company") which the undersigned is entitled to vote at the Annual Meeting of 
Stockholders to be held at 9:00 a.m., local time, on Friday, June 18, 1999, 
at U.S. Trust, 40 Court Street, Boston, Massachusetts, or any adjournment 
thereof, hereby revoking any proxies heretofore given. Each such proxy is 
hereby directed to vote upon the matters set forth on the reverse side hereof 
and, in his own discretion, upon such other matters as may properly come 
before the meeting.

                         (TO BE SIGNED ON REVERSE SIDE)




         PLEASE MARK YOUR
A   /X/  VOTES AS IN THIS
         EXAMPLE



                

                   FOR    WITHHELD

1. Election of     / /      / /       Nominee: Alan S. McKim      THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER
   Directors:                                  John F. Kaslow     DIRECTED HEREON, IF NO DIRECTION IS MADE, THIS PROXY WILL BE 
                                                                  VOTED "FOR" PROPOSAL 1.

For, except vote withheld from the following nominee:


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SIGNATURE:                                                 DATE: 
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Note: Please sign exactly as name appears hereon. Joint owners should each 
      sign. When signing as attorney, executor, administrator, trustee or 
      guardian, please give full name as such.