UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under The Securities Exchange Act of 1934

(Amendment No. 15)*

CALGON CARBON CORPORATION

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class or Securities.)

129603 10 6

                                (CUSIP Number)                                

February 28, 2006

(Date of Event Which Requires Filing of this Statement)

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

¨ 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).

1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only).
	Thomas A. McConomy
2.	Check the Appropriate Box if a Member of a Group (See Instructions)
	(a)
	(b)
3.	SEC Use Only
4.	Citizenship or Place of Organization

Number of Shares Beneficially by Owned by Each Reporting Person With:	5.    Sole Voting Power
	3,747,340
	6.    Shared Voting Power
	7.    Sole Dispositive Power
	3,747,340
	8.    Shared Dispositive Power

9.	Aggregate Amount Beneficially Owned by Each Reporting Person
	3,747,340
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9)
	9.4%
12.	Type of Reporting Person (See Instructions)

Item 1	(a).	Name of Issuer
		Calgon Carbon Corporation (the “Company”)
Item 1	(b).	Address of Issuer’s Principal Executive Offices
		P.O. Box 717 Pittsburgh, PA 15230-0717
Item 2	(a).	Name of Person Filing
		Thomas A. McConomy
Item 2	(b).	Address of Principal Business Office, or if None, Residence
		The principal business address of the undersigned is:
		413 Woodland Road Sewickley, PA 15143
Item 2	(c).	Citizenship
		United States of America
Item 2	(d).	Title of Class of Securities
		Common Stock $.01 par value (the “Common Stock”)
Item 2	(e).	CUSIP No.
		129603 10 6
Item 3.	Statement Filed Pursuant to Rule 13d-1(b) or Rule 13d-2(b)
	None of the categories is applicable to the undersigned.

Item 4.	Ownership
	a)	Amount Beneficially Owned.
		As calculated under Rule 13d-3, as of December 31, 2005, Thomas A. McConomy beneficially owned 3,747,340 shares of Common Stock, of which 67,975 shares are those which he has a right to acquire pursuant to options granted under the Company’s 1993 Non-Employee Directors’ Stock Option Plan, as amended.
	b)	Percent of Class
		As calculated under Rule 13d-3, as of December 31, 2005, Mr. McConomy beneficially owned 9.4% of the shares of Common Stock.
	c)	On December 31, 2005, Mr. McConomy had the sole power to vote and dispose or direct the disposition of the 3,747,340 shares of Common Stock then owned by him.
Item 5.	Ownership of Five Percent or Less of a Class
	Inapplicable
Item 6.	Ownership of More Than Five Percent on Behalf of Another Person
	None
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company
	Inapplicable
Item 8.	Identification and Classification of Members of the Group
	Inapplicable
Item 9.	Notifice of Dissolution of Group
	Inapplicable
Item 10.	Certification
	Inapplicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

March 2, 2006

Date

/s/ Thomas A. McConomy

Signature

Thomas A. McConomy

Name/Title