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  <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br>
  SECURITIES AND EXCHANGE COMMISSION</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
  D.C. 20549</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant to Section&nbsp;13 or 15(d)&nbsp;of
  the Securities Exchange Act of 1934</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event
  reported): <b>April&nbsp;23, 2008</b></font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">CLEAN HARBORS, INC.</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant as specified in its
  charter)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="center">
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Massachusetts</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">0-16379</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-2997780</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other
    jurisdiction<br>
    of incorporation)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission<br>
    File Number)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer<br>
    Identification No.)</font></p>
    </td>
   </tr>
   <tr>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="66%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:66.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">42
    Longwater Drive, Norwell,<br>
    Massachusetts</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;"><br>
    02061-9149</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="66%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:66.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal
    executive offices)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Zip Code)</font></p>
    </td>
   </tr>
  </table>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s telephone number, including area
  code <b>(781) 792-5000</b></font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Not
  Applicable</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Former name or former address, if changed
  since last report.)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check
  the appropriate box below if the Form&nbsp;8-K filing is intended to
  simultaneously satisfy the filing obligation of the registrant under any of the
  following provisions:</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Written
  communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR
  230.425)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Soliciting
  material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR
  240.14a-12)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">
  Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the
  Exchange Act (17 CFR 240.14d-2(b))</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">
  Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the
  Exchange Act (17 CFR 240.13e-4(c))</font></p>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\eudelhofen\08-12519-1\task2891092\12519-1-ba.htm',USER='eudelho',CD='Apr 24 16:01 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div style="font-family:Times New Roman;">
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;1.01</font></u><font size="2" style="font-size:10.0pt;">.&nbsp;&nbsp;<u> Entry into a Material
  Definitive Agreement</u>.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On April&nbsp;23,
  2008, Clean Harbors,&nbsp;Inc. (the &#147;Company&#148;) entered into an Underwriting
  Agreement with Goldman, Sachs&nbsp;&amp; Co., as representative of the several
  underwriters named in Schedule 1 thereto (collectively, the &#147;Underwriters&#148;)<i>,</i> pursuant to which the Company agreed to
  sell, and the Underwriters agreed to purchase, subject to and upon terms and
  conditions set forth therein, 2,500,000 shares (the &#147;Firm Securities&#148;) of the
  Company&#146;s common stock, par value $.01 (&#147;Stock&#148;). The initial offering price to
  the public is $63.75 per share. The issuance and sale of the Firm Shares is
  expected to close on April&nbsp;29, 2008.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant
  to the Underwriting Agreement, the Underwriters also have a 30-day option to
  purchase up to an additional 375,000 shares (the &#147;Optional Securities&#148;) of
  Stock. The Underwriting Agreement defines the 2,500,000 Firm Shares and the up
  to 375,000 Optional Shares collectively as the &#147;Securities.&#148;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
  Underwriting Agreement includes customary representations, warranties and
  covenants by the Company. It also provides for customary indemnification by
  each of the Company and the Underwriters against certain liabilities arising
  out of or in connection with the sale of the Securities and customary
  contribution provisions in respect of those liabilities.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Certain
  of the Underwriters and their related entities have, from time to time,
  performed, and may in the future perform, various financial advisory and
  investment banking services for the Company, for which they have received or
  will receive customary fees and expense reimbursements.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:24.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;letter-spacing:.1pt;">The Securities are registered under the Federal Securities
  Act of 1933, as amended, under the Registration Statement o</font><font size="2" style="font-size:10.0pt;">n Form&nbsp;S-3ASR (Registration No.&nbsp;333-150296)
  (the &#147;Registration Statement&#148;), which relates to the public offering from time
  to time of various securities of the Company. The Registration Statement includes
  a base prospectus dated April&nbsp;17, 2008. In connection with the public
  offering of the Securities, the Company filed with the Securities and Exchange
  Commission (the &#147;SEC&#148;) under the Registration Statement a preliminary
  prospectus supplement dated April&nbsp;17, 2008 and a definitive prospectus
  supplement dated April&nbsp;23, 2008. Such definitive prospectus supplement
  (including the base prospectus) is referred to as the &#147;Prospectus.&#148; In
  accordance with the terms of the Registration Statement and the Prospectus, this
  Report on Form&nbsp;8-K, together with the exhibits filed herewith, is being
  incorporated by reference into the Registration Statement and the Prospectus.</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\eudelhofen\08-12519-1\task2891092\12519-1-ba.htm',USER='eudelho',CD='Apr 24 16:01 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div style="font-family:Times New Roman;">
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;9.01</font></u><font size="2" style="font-size:10.0pt;">.</font><font size="2" style="font-size:10.0pt;">&nbsp;&nbsp;</font><u><font size="2" style="font-size:10.0pt;">Financial Statements and Exhibits</font></u><font size="2" style="font-size:10.0pt;">. </font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Exhibits</font></u><font size="2" style="font-size:10.0pt;">. The following exhibits are being
    filed herewith:</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1.1) Underwriting
    Agreement, dated April&nbsp;23, 2008, between Clean Harbors,&nbsp;Inc. and
    Goldman Sachs&nbsp;&amp; Co., as representative of the several Underwriters
    named in Schedule 1 thereto.</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(5.1) Opinion of
    Davis, Malm&nbsp;&amp; D&#146;Agostine, P.C.</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="82%" valign="top" style="padding:0in 0in 0in 0in;width:82.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="88%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:88.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(23)<b>  </b>Consent of Davis, Malm&nbsp;&amp; D&#146;Agostine, P.C.
    (contained in Exhibit&nbsp;5.1 hereto). </font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='3',FILE='C:\JMS\eudelhofen\08-12519-1\task2891092\12519-1-ba.htm',USER='eudelho',CD='Apr 24 16:01 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></b></p>
  
  <p align="center" style="font-weight:bold;margin:0in 0in .0001pt;page-break-after:auto;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities and
  Exchange Act of 1934, the registrant has duly caused this report to be signed
  on its behalf by the undersigned hereunto duly authorized.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Clean
    Harbors,&nbsp;Inc.</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Registrant)</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">April&nbsp;24,
    2008</font></p>
    </td>
    <td width="33%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:33.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ James M.
    Rutledge</font></p>
    </td>
    <td width="27%" valign="top" style="padding:0in 0in 0in 0in;width:27.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive Vice
    President and</font></p>
    </td>
   </tr>
   <tr>
    <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.34%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="60%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:60.66%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Financial
    Officer</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='4',FILE='C:\JMS\eudelhofen\08-12519-1\task2891092\12519-1-ba.htm',USER='eudelho',CD='Apr 24 16:01 2008' -->
  
  
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "a08-12519_18k.htm", "description": "8-K", "secsgml_size_bytes": 32008}]
metadata_filer: {"company-data": {"conformed-name": "CLEAN HARBORS INC", "cik": "0000822818", "assigned-sic": "4955", "irs-number": "042997780", "state-of-incorporation": "MA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-16379", "film-number": "08775249"}, "business-address": {"street1": "42 LONGWATER DRIVE", "street2": "P.O. BOX 9149", "city": "NORWELL", "state": "MA", "zip": "02061-9149", "phone": "781-792-5000"}, "mail-address": {"street1": "42 LONGWATER DRIVE", "city": "NORWELL", "state": "MA", "zip": "02061-9149"}}
text: UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  Washington,
  D.C. 20549
  FORM 8-K
  CURRENT REPORT
  Pursuant to Section 13 or 15(d) of
  the Securities Exchange Act of 1934
  Date of Report (Date of earliest event
  reported):
  April 23, 2008
  CLEAN HARBORS, INC.
  (Exact name of registrant as specified in its
  charter)
  Massachusetts
  0-16379
  04-2997780
  (State or other
    jurisdiction
  of incorporation)
  (Commission
  File Number)
  (IRS Employer
  Identification No.)
  42
    Longwater Drive, Norwell,
  Massachusetts
  02061-9149
  (Address of principal
    executive offices)
  (Zip Code)
  Registrant's telephone number, including area
  code
  (781) 792-5000
  Not
  Applicable
  (Former name or former address, if changed
  since last report.)
  Check
  the appropriate box below if the Form 8-K filing is intended to
  simultaneously satisfy the filing obligation of the registrant under any of the
  following provisions:
  o
  Written
  communications pursuant to Rule 425 under the Securities Act (17 CFR
  230.425)
  o
  Soliciting
  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
  240.14a-12)
  o
  Pre-commencement communications pursuant to Rule 14d-2(b) under the
  Exchange Act (17 CFR 240.14d-2(b))
  o
  Pre-commencement communications pursuant to Rule 13e-4(c) under the
  Exchange Act (17 CFR 240.13e-4(c))
  Item 1.01
  .
  Entry into a Material
  Definitive Agreement
  .
  On April 23,
  2008, Clean Harbors, Inc. (the "Company") entered into an Underwriting
  Agreement with Goldman, Sachs & Co., as representative of the several
  underwriters named in Schedule 1 thereto (collectively, the "Underwriters")
  ,
  pursuant to which the Company agreed to
  sell, and the Underwriters agreed to purchase, subject to and upon terms and
  conditions set forth therein, 2,500,000 shares (the "Firm Securities") of the
  Company's common stock, par value $.01 ("Stock"). The initial offering price to
  the public is $63.75 per share. The issuance and sale of the Firm Shares is
  expected to close on April 29, 2008.
  Pursuant
  to the Underwriting Agreement, the Underwriters also have a 30-day option to
  purchase up to an additional 375,000 shares (the "Optional Securities") of
  Stock. The Underwriting Agreement defines the 2,500,000 Firm Shares and the up
  to 375,000 Optional Shares collectively as the "Securities."
  The
  Underwriting Agreement includes customary representations, warranties and
  covenants by the Company. It also provides for customary indemnification by
  each of the Company and the Underwriters against certain liabilities arising
  out of or in connection with the sale of the Securities and customary
  contribution provisions in respect of those liabilities.
  Certain
  of the Underwriters and their related entities have, from time to time,
  performed, and may in the future perform, various financial advisory and
  investment banking services for the Company, for which they have received or
  will receive customary fees and expense reimbursements.
  The Securities are registered under the Federal Securities
  Act of 1933, as amended, under the Registration Statement o
  n Form S-3ASR (Registration No. 333-150296)
  (the "Registration Statement"), which relates to the public offering from time
  to time of various securities of the Company. The Registration Statement includes
  a base prospectus dated April 17, 2008. In connection with the public
  offering of the Securities, the Company filed with the Securities and Exchange
  Commission (the "SEC") under the Registration Statement a preliminary
  prospectus supplement dated April 17, 2008 and a definitive prospectus
  supplement dated April 23, 2008. Such definitive prospectus supplement
  (including the base prospectus) is referred to as the "Prospectus." In
  accordance with the terms of the Registration Statement and the Prospectus, this
  Report on Form 8-K, together with the exhibits filed herewith, is being
  incorporated by reference into the Registration Statement and the Prospectus.
  2
  Item 9.01
  .
  Financial Statements and Exhibits
  .
  (a)
  Not applicable.
  (b)
  Not applicable.
  (c)
  Not applicable.
  (d)
  Exhibits
  . The following exhibits are being
    filed herewith:
  (1.1) Underwriting
    Agreement, dated April 23, 2008, between Clean Harbors, Inc. and
    Goldman Sachs & Co., as representative of the several Underwriters
    named in Schedule 1 thereto.
  (5.1) Opinion of
    Davis, Malm & D'Agostine, P.C.
  (23)
  Consent of Davis, Malm & D'Agostine, P.C.
    (contained in Exhibit 5.1 hereto).
  3
  SIGNATURES
  Pursuant to the requirements of the Securities and
  Exchange Act of 1934, the registrant has duly caused this report to be signed
  on its behalf by the undersigned hereunto duly authorized.
  Clean
    Harbors, Inc.
  (Registrant)
  April 24,
    2008
  /s/ James M.
    Rutledge
  Executive Vice
    President and
  Chief Financial
    Officer
  4