Exhibit 2.15

CERTIFICATE OF CHANGE OF LOCATION OF REGISTERED OFFICE

AND OF REGISTERED AGENT

XRG, INC.

It is hereby certified that:

1. The name of the corporation (hereinafter called the “Corporation”) is XRG, Inc.

2. The registered office of the Corporation within the State of Delaware is hereby changed to 9 East Loockerman Street, City of Dover 19901, County of Kent.

3. The registered agent of the Corporation within the State of Delaware is hereby changed to National Registered Agents, Inc., the business office of which is identical with the registered office of the corporation as hereby changed.

4. The Corporation has authorized the changes hereinbefore set forth by resolution of its Board of Directors.

Signed on November 19, 2002.

By: /s/ Kevin Brennan                   

Kevin Brennan

Title: President

STATE OF DELAWARE

SECRETARY OF STATE

DIVISION OF CORPORATIONS

FILED 09:00 AM 11/27/2002

020735479 - 3318552