Exhibit 3.11

CERTIFICATE OF FORMATION

OF

GPC SUB GP LLC

The undersigned, an authorized natural person, forthe purpose of forming a limited liability company, under the provisions and subject to the requirements of the State of Delaware (particularly Chapter 18, Title 6 of the Delaware Code and the acts amendatory thereof and supplemental thereto,and known, identified, and referred to as the “Delaware Limited Liability Company Act”), hereby certifies that:

FIRST:  The name of the limited liability company (hereinafter called the “limited liability company”) is:

GPC Sub GP LLC

SECOND:  The address of the registered office and the name and the address of the registered agent of the limited liability company required to be maintained by Section 18-104 of the Delaware Limited Liability Company Act are Corporation Service Company, 1013 Centre Road, New Castle County, Wilmington, Delaware 19805.

Executed on January 5, 1998

/s/ Sharon L. Dougherty

Sharon L. Dougherty, Authorized Person

CERTIFICATE OF AMENDMENT

OF

GPC Sub GP LLC

1.             The name of the limited liability company is GPCSub GP LLC.

2.             The Certificate of Formation of the limited liability company is hereby amended as follows:

(set forth amendment(s))

Resolved, that the registered office in the state of Delaware be and it hereby is changed to Corporation Trust Center,1209 Orange Street, in the City of Wilmington, County of New Castle, and the authorization of the present register agent of this corporation be and the same is hereby withdrawn, and THECORPORATION TRUST COMPANY, shall be and is hereby constituted and appointed the registered agent of this company at the address of its registered office.

3.             This Certificate of Amendment shall be effective on when filed.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Amendment of GPC Sub GP LLC this 17^thday of January, 2000.

/s/ Jay W. Hereford

Jay W. Hereford, Asst. Treasurer