AECOM International S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 3.55

Delaware	Page 1
The First State

I, HARRIET SMITH WINDSOR, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF FORMATION OF “URS NUCLEAR LLC”, FILED IN THIS OFFICE ON THE TENTH DAY OF DECEMBER, A.D. 2008, AT 1:56 O’CLOCK P.M.

	4631872	8100			Harriet Smith Windsor, Secretary of State
	081181851			AUTHENTICATION: 7022330
You may verify this certificate online at corp.delaware.gov/authver.shtml					DATE: 12-12-08

State of Delaware

Secretary of State

Division of Corporations

Delivered 02:13 PM 12/10/2008

FILED 01:56 PM 12/10/2008

SRV 081181851 – 4631872 FILE

STATEof DELAWARE

LIMITED LIABILITY COMPANY

CERTIFICATEof FORMATION

First: The name of the limited liability company isURS Nuclear LLC

Second: The address of its registered office in the State of Delaware is2711 Centerville Road, Suite 400 in the City ofWilmington. Zip code19808. The name of its Registered agent at such address isCorporation Service Company

Third:(Use this paragraph only if the company is to have a specific effective date of dissolution: “The latest date on which the limited liability company is to dissolve is                                              .”)

Fourth:(Insert any other matters the members determine to include herein.)

In Witness Whereof,the undersigned have executed this Certificate of Formation this12th day ofDecember,2008.

By:
	Authorized Person (s)
Name:	R.J. Hill