As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 4/25/03  Clean Harbors Inc.                ARS        12/31/02    1:2K                                     SEC #7                   
 4/10/03‡ Clean Harbors Inc.                10-K       12/31/02    5:2.3M                                   Donnelley Fin’l S… 07/FA 
  4/1/03  Clean Harbors Inc.                NT 10-K    12/31/02    1:35K                                    Donnelley Fin’l S… 07/FA 
 2/14/03  Devillars John P                  5          Director²   1:15K  Clean Harbors Inc.                R R Donnelley … Filer/FA 
 2/14/03  Paschetag Carl Jr.                5          Officer²    1:15K  Clean Harbors Inc.                R R Donnelley … Filer/FA 
 1/30/03  Koenecke Roger A                  5          Officer²    1:17K  Clean Harbors Inc.                R R Donnelley … Filer/FA 
12/31/02  Cookson Eugene A Jr.              4          Officer²    1:23K  Clean Harbors Inc.                R R Donnelley … Filer/FA 

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‡	A non-Insider-Ownership Filing that was accepted after the SEC “closed” at 5:30:00pm ET.  The legal “Filed As Of” date may be the next, or another, day.
¹	Filing/Form Types:  -K
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	5	Annual Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 5 { The Filer is an Insider² of the Issuer }.
	10-K	Annual Report — Form 10-K.
	ARS	Annual Report to Security Holders.
	NT 10-K	Notice of a Late Filing of a Form 10-K Annual Report — Form 12b-25.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.