EXHIBIT 3.193

STATE OF DELAWARE

SECRETARY OF STATE

DIVISION OF CORPORATIONS

FILED 09:00 AM 03/19/2001

010135356 - 3370540

CERTIFICATE OF FORMATION

OF

RADNOR GP-555 LA, L.L.C.

A LIMITED LIABILITY COMPANY

          FIRST:          The name of the limited liability company is: RADNOR GP-555 LA, L.L.C.

          SECOND:     The address of the registered office of the limited liability company in the State of Delaware is 2711 Centerville Road, Suite 400, in the City of Wilmington, County of New Castle, 19808, and its registered agent for service of process at such address is CORPORATION SERVICE COMPANY.

          IN WITNESS WHEREOF, the undersigned, being the individual forming the limited liability company, has executed, signed and acknowledged this Certificate of Formation this 19th day of March, 2001.

/s/ Frank J. Ferro

Name: Frank J. Ferro

Title: Authorized Person