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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL SCHEDULE 13G

Under the Securities Exchange Act of 1934

Clean Harbors Inc
--------------------------------------------------------------------------------
(Name of Issuer)

Common Stock
--------------------------------------------------------------------------------
(Title of Class of Securities)

184496107
--------------------------------------------------------------------------------
(CUSIP Number)

December 31, 2001
--------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ X ]   Rule 13d-1(b)

[   ]   Rule 13d-1(c)

[   ]   Rule 13d-1(d)

*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 the
disclosures provided in a prior cover page.

The information required in 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).

PAGE 1 OF 7 PAGES

-----------------------------------------                                        --------------------------------------
CUSIP No.   184496107                                      13G                   Page  2  of  7  Pages
-----------------------------------------                                        --------------------------------------

---------- -----------------------------------------------------------------------------------------------------------------
1      NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only).

John Hancock Financial Services, Inc.
I.R.S. No. 04-3483032

---------- -----------------------------------------------------------------------------------------------------------------
2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
(b)  |_|
N/A

---------- -----------------------------------------------------------------------------------------------------------------
3      SEC USE ONLY

---------- -----------------------------------------------------------------------------------------------------------------
4      CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

---------- -----------------------------------------------------------------------------------------------------------------
5     SOLE VOTING POWER
Number of
Shares                 -0-

-------- -------------------------------------------------------------------------------------------
Beneficially        6     SHARED VOTING POWER
Owned by
Each                  -0-

-------- -------------------------------------------------------------------------------------------
Reporting          7     SOLE DISPOSITIVE POWER
Person
With                  -0-

-------- -------------------------------------------------------------------------------------------
8     SHARED DISPOSITIVE POWER

-0-

---------- -----------------------------------------------------------------------------------------------------------------
9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

None, except through its direct, wholly-owned subsidiary, John Hancock Life Insurance Company.

---------- -----------------------------------------------------------------------------------------------------------------
10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

N/A

---------- -----------------------------------------------------------------------------------------------------------------
11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

See line 9, above.

---------- -----------------------------------------------------------------------------------------------------------------
12      TYPE OF REPORTING PERSON*

HC

---------- -----------------------------------------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
PAGE 2 OF 7 PAGES

-----------------------------------------                                        --------------------------------------
CUSIP No.   184496107                                      13G                   Page  3  of  7  Pages
-----------------------------------------                                        --------------------------------------

---------- -----------------------------------------------------------------------------------------------------------------
1      NAME OF REPORTING PERSON
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only).

John Hancock Life Insurance Company
I.R.S. No. 04-1414660

---------- -----------------------------------------------------------------------------------------------------------------
2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
(b)  |_|
N/A

---------- -----------------------------------------------------------------------------------------------------------------
3      SEC USE ONLY

---------- -----------------------------------------------------------------------------------------------------------------
4      CITIZENSHIP OR PLACE OF ORGANIZATION

Commonwealth of Massachusetts

---------- -----------------------------------------------------------------------------------------------------------------
5     SOLE VOTING POWER
Number of
Shares                 954,812

-------- -------------------------------------------------------------------------------------------
Beneficially        6     SHARED VOTING POWER
Owned by
Each                  -0-

-------- -------------------------------------------------------------------------------------------
Reporting          7     SOLE DISPOSITIVE POWER
Person
With                  954,812

-------- -------------------------------------------------------------------------------------------
8     SHARED DISPOSITIVE POWER

-0-

---------- -----------------------------------------------------------------------------------------------------------------
9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

954,812

---------- -----------------------------------------------------------------------------------------------------------------
10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

N/A

---------- -----------------------------------------------------------------------------------------------------------------
11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

7.7%

---------- -----------------------------------------------------------------------------------------------------------------
12      TYPE OF REPORTING PERSON*

IC, IA

---------- -----------------------------------------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
PAGE 3 OF 7 PAGES

The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative other than an
executive officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

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

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

Item 1(a)    Name of Issuer:
--------------
Clean Harbors Inc

Item 1(b)    Address of Issuer's Principal Executive Offices:
-----------------------------------------------
1501 Washington Street
Braintree, MA 02184

Item 2(a)    Name of Person Filing:
---------------------
This filing is made on behalf of John Hancock Financial
Services, Inc. ("JHFS"), and JHFS's direct, wholly-owned
subsidiary, John Hancock Life Insurance Company
("JHLICO").

Item 2(b)    Address of the Principal Offices:
--------------------------------
The principal business offices of JHFS and JHLICO is
located at John Hancock Place, P.O. Box 111, Boston, MA
02117.

Item 2(c)    Citizenship:
-----------
JHLICO is organized and exists under the laws of the
Commonwealth of Massachusetts. JHFS is organized and
exists under the laws of the State of Delaware.

Item 2(d)    Title of Class of Securities:
----------------------------
Common Stock

Item 2(e)    CUSIP Number:
------------
184496107

Item 3       If the Statement is being filed pursuant to Rule
------------------------------------------------
13d-1(b), or 13d-2(b), check whether the person filing is a:
-----------------------------------------------------------

JHFS          (g) (X) Parent Holding Company, in accordance with
ss.240.13d-1(b)(ii)(G).

JHLICO:       (c) (X) Insurance Company as defined inss.3(a)(19) of the Act.

(e) (X) Investment Adviser registered under ss.203 of the
Investment Advisers Act of 1940.

PAGE 4 OF 7 PAGES

Item 4       Ownership:
---------

(a)    Amount Beneficially Owned: JHLICO has direct beneficial 
ownership of 954,812 Warrants for Common Stock, exercisable 
immediately.

(b)    Percent of Class:  7.7%
----------------

(c)    (i)    sole power to vote or to direct the vote:
JHLICO has sole power to vote or to direct
the vote of the 954,812 shares as discussed
in Item 4(a) above.

(ii)   shared power to vote or to direct the vote:  -0-

(iii)  sole power to dispose or  to direct the disposition of:
JHLICO has sole power to dispose or to
direct the disposition of the 954,812 shares
as discussed in Item 4(a) above.

(iv)   shared power to dispose or to direct the disposition of:  -0-

Item 5       Ownership of Five Percent or Less of a Class:
--------------------------------------------
Not applicable

Item 6       Ownership of More than Five Percent on Behalf of Another Person:
---------------------------------------------------------------
Not applicable.

Item 7       Identification and Classification of the Subsidiary which Acquired 
------------------------------------------------------------------
the Security Being Reported on  by the Parent Holding Company:
-------------------------------------------------------------
Not applicable.

Item 8       Identification and Classification of Members of the Group:
---------------------------------------------------------
Not applicable.

Item 9       Notice of Dissolution of a Group:
--------------------------------
Not applicable.

Item 10      Certification:
-------------
By signing below the undersigned certifies that, to the
best of its knowledge and belief, the securities referred
to above were acquired in the ordinary course of business
and were not acquired for the purpose of and do not have
the effect of changing or influencing the control of the
issuer of such securities and were not acquired in
connection with or as a participant in any transaction
having such purpose or effect.

PAGE 5 OF 7 PAGES

SIGNATURE

After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

John Hancock Financial Services, Inc.

By:      /s/Barry J. Rubenstein
----------------------
Name:    Barry J. Rubenstein
Dated: May 1, 2002                                            Title:   Vice President, Counsel & Secretary

John Hancock Life Insurance Company

By:      /s/Barry E. Welch
-----------------
Name:    Barry E. Welch
Dated: May 1, 2002                                            Title:   Senior Managing Director

PAGE 6 OF 7 PAGES

EXHIBIT A
JOINT FILING AGREEMENT
----------------------

John Hancock Financial Services, Inc. and John Hancock Life Insurance
Company agree that the Initial Schedule 13G, to which this Agreement is
attached, relating to the Common Stock of Clean Harbors Inc is filed on behalf
of each of them.

John Hancock Financial Services, Inc.

By:      /s/Barry J. Rubenstein
----------------------
Name:    Barry J. Rubenstein
Dated: May 1, 2002                                            Title:   Vice President, Counsel & Secretary

John Hancock Life Insurance Company

By:      /s/Barry E. Welch
-----------------
Name:    Barry E. Welch
Dated: May 1, 2002                                            Title:   Senior Managing Director

PAGE 7 OF 7 PAGES