CALGON CARBON CORPORATION
SC 13G/A, 1999-01-28
INDUSTRIAL INORGANIC CHEMICALS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                          




                                  SCHEDULE 13G







                    Under the Securities Exchange Act of 1934
                               (Amendment No. 4)*


                            Calgon Carbon Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    129603106
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 1998
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

          [ 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 9 PAGES

<PAGE>

<TABLE>
<CAPTION>


                <S>                                        <C>                                    <C>  
- -----------------------------------------                                        --------------------------------------
CUSIP No.   129603106                                      13G                   Page  2  of  9  Pages

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           John Hancock Mutual 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                 -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 indirect, wholly-owned subsidiary, NM Capital Management, Inc.

- ---------- -------------------------------------------------------------------------------------------------------------
   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*

           IC, IA, HC

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 2 OF 9 PAGES


<PAGE>




- -----------------------------------------                                        --------------------------------------
CUSIP No.   129603106                                      13G                   Page  3  of  9  Pages

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           John Hancock Subsidiaries, Inc.
           I.R.S. No. 04-2687223

- ---------- -------------------------------------------------------------------------------------------------------------
    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 indirect, wholly-owned subsidiary, NM Capital Management, Inc.

- ---------- -------------------------------------------------------------------------------------------------------------
   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 3 OF 9 PAGES


<PAGE>





- -----------------------------------------                                        --------------------------------------
CUSIP No.   129603106                                      13G                   Page  4  of  9  Pages

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           The Berkeley Financial Group
           I.R.S. No. 04-3145626

- ---------- -------------------------------------------------------------------------------------------------------------
    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, NM Capital Management, Inc.

- ---------- -------------------------------------------------------------------------------------------------------------
   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 4 OF 9 PAGES


<PAGE>




- -----------------------------------------                                        --------------------------------------
CUSIP No.   129603106                                      13G                   Page  5  of  9  Pages

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           NM Capital Management, Inc.
           I.R.S. No. 85-0268885

- ---------- -------------------------------------------------------------------------------------------------------------
    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

           New Mexico

- ---------- -------------------------------------------------------------------------------------------------------------
                       5     SOLE VOTING POWER
    Number of
      Shares                 169,600

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

                    -------- -------------------------------------------------------------------------------------------
    Reporting          7     SOLE DISPOSITIVE POWER
      Person
       With                  586,778

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

                             -0-

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

           586,778

- ---------- -------------------------------------------------------------------------------------------------------------
   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

           1.5%

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

           IA

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 5 OF 9 PAGES
</TABLE>


<PAGE>



         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:
                      Calgon Carbon Corporation

         Item 1(b)    Address of Issuer's Principal Executive Offices:
                      P.O. Box 717
                      400 Calgon Drive
                      Pittsburgh, PA   15230

         Item 2(a)    Name of Person Filing:
                      This filing is made on behalf of John Hancock  Mutual Life
                      Insurance   Company    ("JHMLICO"),    JHMLICO's   direct,
                      wholly-owned subsidiary,  John Hancock Subsidiaries,  Inc.
                      ("JHSI"),  JHSI's  direct,  wholly-owned  subsidiary,  The
                      Berkeley  Financial  Group  ("TBFG")  and  TBFG's  direct,
                      wholly-owned  subsidiary,  NM  Capital  Management,   Inc.
                      ("NM").

         Item 2(b)    Address of the Principal Offices:
                      The  principal  business  offices of JHMLICO  and JHSI are
                      located at John Hancock Place,  P.O. Box 111,  Boston,  MA
                      02117.  The principal  business offices of TBFG is located
                      at 101 Huntington Avenue, Boston, Massachusetts 02199. The
                      principal  business office of NM is 6501 Americas Parkway,
                      Suite 950, Albuquerque, NM 87110-5372.

         Item 2(c)    Citizenship:
                      JHMLICO  was  organized  and exists  under the laws of the
                      Commonwealth   of   Massachusetts.   JHSI  and  TBFG  were
                      organized  and  exist  under  the  laws  of the  State  of
                      Delaware.  NM was  organized  and exists under the laws of
                      the State of New Mexico.

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

         Item 2(e)    CUSIP Number:
                      129603106

         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:

                      JHMLICO:      (c) (X) Insurance Company as defined in
                                            ss.3(a)(19) of the Act.

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

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




                                PAGE 6 OF 9 PAGES

<PAGE>




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

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

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

         Item 4       Ownership:

                      (a)    Amount  Beneficially  Owned: NM  beneficially  owns
                             586,778 shares of Common Stock in various  advisory
                             accounts.     Through    their    parent-subsidiary
                             relationship to NM and JHA, JHMLICO,  JHSI and TBFG
                             have indirect,  beneficial  ownership of these same
                             shares.

                      (b)    Percent of Class:
                             NM:   1.5%

                      (c)    (i)    sole power to vote or to direct the vote:
                                    NM:     169,600

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

                             (iii)  sole power to dispose or to direct the 
                                    disposition of:
                                    NM:     586,778

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

         Item 5       Ownership of Five Percent or Less of a Class:
                      Reporting persons own five percent or less of Common 
                      Stock.

         Item 6       Ownership of More than Five Percent on Behalf of Another
                      Person:    See Item 4(a).

         Item 7       Identification  and  Classification  of the  Subsidiary
                      which  Acquired  the  Security  Being  Reported  on by the
                      Parent Holding Company:
                      See Items 2(a), 3 and 4.

         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 7 OF 9 PAGES


<PAGE>


                                    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 Mutual Life Insurance Company

                                   By:      /s/Gregory P. Winn
                                            ------------------------------------
                                   Name:    Gregory P. Winn
Dated: January 22, 1999            Title:   Vice President & Treasurer

                                   John Hancock Subsidiaries, Inc.

                                   By:      /s/Gregory P. Winn
                                            ------------------------------------
                                   Name:    Gregory P. Winn
Dated: January 22, 1999            Title:   Treasurer


                                   The Berkeley Financial Group

                                   By:      /s/Susan S. Newton
                                            ------------------------------------
                                   Name:    Susan S. Newton
Dated: January 22, 1999            Title:   Vice President


                                   NM Capital Management, Inc.

                                   By:      /s/Susan S. Newton
                                            ------------------------------------
                                   Name:    Susan S. Newton
Dated: January 22, 1999            Title:   Assistant Secretary






                                PAGE 8 OF 9 PAGES


<PAGE>



EXHIBIT A
                             JOINT FILING AGREEMENT

         John Hancock Mutual Life Insurance Company, John Hancock Subsidiaries,
Inc., The Berkeley Financial Group and NM Capital Management, Inc. agree that
the Terminating Schedule 13G,(Amendment No. 4) to which this Agreement is
attached, relating to the Common Stock of Calgon Carbon Corporation is filed on
behalf of each of them.


                                  John Hancock Mutual Life Insurance Company

                                  By:      /s/Gregory P. Winn
                                           -------------------------------------
                                  Name:    Gregory P. Winn
Dated: January 22, 1999           Title:   Vice President & Treasurer

                                  John Hancock Subsidiaries, Inc.

                                  By:      /s/Gregory P. Winn
                                           -------------------------------------
                                  Name:    Gregory P. Winn
Dated: January 22, 1999           Title:   Treasurer


                                  The Berkeley Financial Group

                                  By:      /s/Susan S. Newton
                                           -------------------------------------
                                  Name:    Susan S. Newton
Dated: January 22, 1999           Title:   Vice President

                                  NM Capital Management, Inc.

                                  By:      /s/Susan S. Newton
                                           -------------------------------------
                                  Name:    Susan S. Newton
Dated: January 22, 1999           Title:   Assistant Secretary









                                PAGE 9 OF 9 PAGES





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