EXHIBIT 4.1

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|   | Company:             |                                                         |
|--------|----------------------|--------------------------------------------------------------|
|   | URS      Corporation |                                                         |
|   |                 |                                                         |   |
|   | By:                  | /s/ H.      Thomas Hicks                                |   |
|   |                 | Title:       Chief Financial Officer and Vice President |   |
|   |                 |                                                         |   |

|        | Lenders:                                                                    |                                              |
|--------|-----------------------------------------------------------------------------|---------------------------------------------------|
|   | Wells      Fargo Bank, National Association, individually and as      Agent |                                              |
|   |                                                                        |                                              |   |
|   | By:                                                                         | /s/ Robert      O'Sullivan                   |   |
|   |                                                                        | Title:      Vice President / Relationship Manager |   |
|   |                                                                        |                                              |   |

----

|   | Abu      Dhabi International Bank, Inc., as Lender |                         |
|--------|----------------------------------------------------|------------------------------|
|   |                                               |                         |   |
|   | By:                                                | /s/ David      J. Young |   |
|   |                                               | Title:      Vice President   |   |
|   |                                               |                         |   |

|   | By:    | /s/ Pamela      Sigda     |   |
|--------|--------|--------------------------------|--------|
|   |   | Title:      Sr. Vice President |   |

|        | Allied      Irish Banks Debt Management Ltd., as    Lender |                                                                                |
|--------|------------------------------------------------------------|-------------------------------------------------------------------------------------|
|   |                                                       |                                                                                |   |
|   | By:                                                        | /s/ Jean      Pierre Knight                                                    |   |
|   |                                                       | Title:      Vice President, Investment Advisor to AIB Debt Management,      Limited |   |
|   |                                                       |                                                                                |   |

|   | By:    | /s/ Larissa      Megerdichian                                                                 |   |
|--------|--------|----------------------------------------------------------------------------------------------------|--------|
|   |   | Title: Assistant      Vice President, Investment Advisor to AIB Debt Management,      Limited |   |

|        | Allied      Irish Banks p.l.c., as Lender |                             |
|--------|-------------------------------------------|----------------------------------|
|   |                                      |                             |   |
|   | By:                                       | /s/ Jean      Pierre Knight |   |
|   |                                      | Title:      Vice President       |   |
|   |                                      |                             |   |

|   | By:    | /s/ Larissa      Megerdichian        |   |
|--------|--------|-------------------------------------------|--------|
|   |   | Title: Assistant      Vice President |

|        | Australia      and New Zealand Banking Group Limited, as a      Lender |                        |
|--------|------------------------------------------------------------------------|-----------------------------|
|   |                                                                   |                        |   |
|   | By:                                                                    | /s/ Robert      Grillo |   |
|   |                                                                   | Title:      Director        |   |
|   |                                                                   |                        |   |

|        | Bank      of America, N.A., as Lender |                                   |
|--------|---------------------------------------|----------------------------------------|
|   |                                  |                                   |   |
|   | By:                                   | /s/ signature      indecipherable |   |
|   |                                  | Title:      Vice President             |   |
|   |                                  |                                   |   |

|        | Barclays      Bank PLC, as Lender |                                   |
|--------|-----------------------------------|----------------------------------------|
|   |                              |                                   |   |
|   | By:                               | /s/ signature      indecipherable |   |
|   |                              | Title:      Director                   |   |
|   |                              |                                   |   |

----

|   | Bayerische      Landesbank, New York Branch, as a Lender |                              |
|--------|----------------------------------------------------------|-----------------------------------|
|   |                                                     |                              |   |
|   | By:                                                      | /s/ Nikolai      von Mongden |   |
|   |                                                     | Title:      Senior Vice President |   |
|   |                                                     |                              |   |

|   | By:    | /s/ Michael      Hintz     |   |
|--------|--------|---------------------------------|--------|
|   |   | Title: Vice      President |   |

|        | Magnetite      v CLO, Limited                      |                             |
|--------|----------------------------------------------------|----------------------------------|
|   | Longhorn      CDO III Ltd.                         |                             |
|   | BlackRock      Senior Income Series V Limited      |                             |
|   | BlackRock      Senior Income Series                |                             |
|   | BlackRock      Senior Income Series II             |                             |
|   | BlackRock      Senior Income Series IV, as Lenders |                             |
|   |                                               |                             |   |
|   | By:                                                | /s/ AnnMarie      Smith     |   |
|   |                                               | Title:      Authorized Signatory |   |
|   |                                               |                             |   |

|        | Blue      Shield of California                               |                       |
|--------|--------------------------------------------------------------|----------------------------|
|   | Franklin      CLO V, Limited                                 |                       |
|   | Franklin      Floating Rate Daily Access Fund                |                       |
|   | Franklin      Templeton Series II Fund Floating Rate II Fund |                       |
|   | Franklin      Templeton Limited Duration Income Trust        |                       |
|   | Franklin      Floating Rate Master Series, as Lenders        |                       |
|   |                                                         |                       |   |
|   | By:                                                          | /s/ Tyler      Chan   |   |
|   |                                                         | Title:      Vice President |   |
|   |                                                         |                       |   |

|        | BMO      Capital Markets Financing Inc., as      Lender |                       |
|--------|---------------------------------------------------------|----------------------------|
|   |                                                    |                       |   |
|   | By:                                                     | /s/ Scott      Morris |   |
|   |                                                    | Title:      Vice President |   |
|   |                                                    |                       |

----

|   | BNP      Paribas, as Lender |                          |
|--------|-----------------------------|-------------------------------|
|   |                        |                          |   |
|   | By:                         | /s/ Jamie      Dillon    |   |
|   |                        | Title:      Managing Director |   |
|   |                        |                          |   |

|   | By:    | /s/ Joseph      Mack       |   |
|--------|--------|---------------------------------|--------|
|   |   | Title: Vice      President |   |

|        | Capital      One Leverage Finance Corporation, as      Lender |                       |
|--------|---------------------------------------------------------------|----------------------------|
|   |                                                          |                       |   |
|   | By:                                                           | /s/ Paul      Dellova |   |
|   |                                                          | Title:      SVP            |   |
|   |                                                          |                       |   |

|        | Citibank,      NA, as Lender |                       |
|--------|------------------------------|----------------------------|
|   |                         |                       |   |
|   | By:                          | /s/ Scott      Kates  |   |
|   |                         | Title:      Vice President |   |
|   |                         |                       |   |

|        | Commerzbank      AG, as Lender |                               |
|--------|--------------------------------|------------------------------------|
|   |                           |                               |   |
|   | By:                            | /s/ Edward      Forsberg, Jr. |   |
|   |                           | Title:      Senior Vice President  |   |
|   |                           |                               |   |

|   | By:    | /s/ Matias      Cruces     |   |
|--------|--------|---------------------------------|--------|
|   |   | Title: Vice      President |

|        | East      West Bank, as Lender |                              |
|--------|--------------------------------|-----------------------------------|
|   |                           |                              |   |
|   | By:                            | /s/ Nancy      A. Moore      |   |
|   |                           | Title:      Senior Vice President |   |
|   |                           |                              |   |

|        | Fifth      Third Bank, as Lender |                                   |
|--------|----------------------------------|----------------------------------------|
|   |                             |                                   |   |
|   | By:                              | /s/ signature      indecipherable |   |
|   |                             | Title:      Vice President             |   |
|   |                             |                                   |   |

----

|   | First      Bank, as Lender |                             |
|--------|----------------------------|----------------------------------|
|   |                       |                             |   |
|   | By:                        | /s/ Nanci      Brusati Dias |   |
|   |                       | Title:      Vice President       |   |
|   |                       |                             |   |

|        | Fortis      Capital Corp., as Lender |                                  |
|--------|--------------------------------------|---------------------------------------|
|   |                                 |                                  |   |
|   | By:                                  | /s/ John      W. Deehan          |   |
|   |                                 | Title:      Director & Group Head |   |
|   |                                 |                                  |   |

|   | By:    | /s/ John      Spillane     |   |
|--------|--------|---------------------------------|--------|
|   |   | Title: Vice      President |   |

|        | General      Electric Capital Corporation, as      Lender |                                  |
|--------|-----------------------------------------------------------|---------------------------------------|
|   |                                                      |                                  |   |
|   | By:                                                       | /s/ James      R. Persico        |   |
|   |                                                      | Title:      Duly Authorized Signatory |   |
|   |                                                      |                                  |   |

|        | Greyrock      CDO, LTD.                                      |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |                                                         |                             |   |

|        | HSBC      Bank USA, N.A., as Lender |                                  |
|--------|-------------------------------------|---------------------------------------|
|   |                                |                                  |   |
|   | By:                                 | /s/ David      Hants             |   |
|   |                                | Title:      SVP, Commercial Executive |   |
|   |                                |                                  |   |

|        | Landmark      III CDO Limited                                |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |                                                         |                             |   |

----

|        | Landmark      III CDO Limited                                |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

|        | Landmark      V CDO Limited                                  |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

|        | Landmark      VI CDO Limited                                 |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

|        | Landmark      VII CDO Limited                                |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

|        | Landmark      VIII CDO Limited                               |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

|        | Landmark      IX CDO Limited                                 |                             |
|--------|--------------------------------------------------------------|----------------------------------|
|   | By      Aladdin Capital Management LLC as Manager, as Lender |                             |
|   |                                                         |                             |   |
|   | By:                                                          | /s/ Christine      M. Barto |   |
|   |                                                         | Title:      Authorized Signatory |   |
|   |

----

|        | LCM      I Limited Partnership                                             |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |

|        | LCM      II Limited Partnership                                            |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |

|        | LCM      III Ltd.                                                          |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |

|        | LCM      IV Ltd.                                                           |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |

|        | LCM V      Ltd.                                                       |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |

----

|        | LCM      VI Limited Partnership                                            |                          |
|--------|----------------------------------------------------------------------------|-------------------------------|
|   | By      Lyon Capital Management LLC, As Collateral Manager, as      Lender |                          |
|   |                                                                       |                          |   |
|   | By:                                                                        | /s/ Sophie      A. Venon |   |
|   |                                                                       | Title:      Portfolio Manager |   |
|   |
|   | MB      Financial Bank, N.A., as Lender |                                   |
|--------|-----------------------------------------|----------------------------------------|
|   |                                    |                                   |   |
|   | By:                                     | /s/ signature      indecipherable |   |
|   |                                    | Title:      Vice President             |   |
|   |                                    |                                   |   |

|        | M&T      Bank, as Lender |                           |
|--------|------------------------------|--------------------------------|
|   |                         |                           |   |
|   | By:                          | /s/ Sue      Ann O'Malley |   |
|   |                         | Title:      Vice President     |   |
|   |                         |                           |   |

|        | Mega      International Commercial Bank Co.,      Ltd. |                               |
|--------|--------------------------------------------------------|------------------------------------|
|   | New      York Branch, as Lender                        |                               |
|   |                                                   |                               |   |
|   | By:                                                    | /s/ Priscilla      H.T. Hsing |   |
|   |                                                   | Title:      VP & DGM           |   |
|   |                                                   |                               |   |

|        | Mizuho      Corporate Bank, Ltd., as    Lender |                                   |
|--------|------------------------------------------------|----------------------------------------|
|   |                                           |                                   |   |
|   | By:                                            | /s/ signature      indecipherable |   |
|   |                                           | Title:      Authorized Signatory       |   |
|   |                                           |                                   |   |

|        | Morgan      Stanley Bank, N.A., asLender |                             |
|--------|------------------------------------------|----------------------------------|
|   |                                     |                             |   |
|   | By:                                      | /s/ Ryan      Vetsch        |   |
|   |                                     | Title:      Authorized Signatory |   |
|   |                                     |                             |   |

|        | Morgan      Stanley Senior Funding, Inc., as      Lender |                             |
|--------|----------------------------------------------------------|----------------------------------|
|   |                                                     |                             |   |
|   | By:                                                      | /s/ Ryan      Vetsch        |   |
|   |                                                     | Title:      Authorized Signatory |   |
|   |                                                     |                             |   |

----

|        | National      City Bank, as Lender |                              |
|--------|------------------------------------|-----------------------------------|
|   |                               |                              |   |
|   | By:                                | /s/ Karen      P. Dawies     |   |
|   |                               | Title:      Senior Vice President |   |
|   |
|   | Raymond      James Bank, FSB, as a Lender |                                                 |
|--------|-------------------------------------------|------------------------------------------------------|
|   |                                      |                                                 |   |
|   | By:                                       | /s/ Joseph      A. Ciccolini                    |   |
|   |                                      | Title:      Vice President - Senior Corporate Banker |   |
|   |                                      |                                                 |   |

|        | Scotiabanc      Inc., as Lender |                          |
|--------|---------------------------------|-------------------------------|
|   |                            |                          |   |
|   | By:                             | /s/ J.F.      Todd       |   |
|   |                            | Title:      Managing Director |   |
|   |                            |                          |   |

|        | Sumitomo      Mitsui Banking Corporation, as      Lender |                          |
|--------|----------------------------------------------------------|-------------------------------|
|   |                                                     |                          |   |
|   | By:                                                      | /s/ William      M. Ginn |   |
|   |                                                     | Title:      Executive Officer |   |
|   |                                                     |                          |   |

|        | SunTrust      Bank, as Lender |                       |
|--------|-------------------------------|----------------------------|
|   |                          |                       |   |
|   | By:                           | /s/ Shawn      Wilson |   |
|   |                          | Title:      Vice President |   |
|   |                          |                       |   |

|        | The      Bank of Nova Scotia, as      Lender |                    |
|--------|----------------------------------------------|-------------------------|
|   |                                         |                    |   |
|   | By:                                          | /s/ Teresa      Wu |   |
|   |                                         | Title:      Director    |   |
|   |                                         |                    |   |

|        | The      Royal Bank of Scotland plc, as      Lender |                          |
|--------|-----------------------------------------------------|-------------------------------|
|   |                                                |                          |   |
|   | By:                                                 | /s/ Donald      Sutton   |   |
|   |                                                | Title:      Managing Director |   |
|   |                                                |                          |   |

----

|        | UBS      AG, Stamford Branch, as a    Lender |                           |
|--------|----------------------------------------------|--------------------------------|
|   |                                         |                           |   |
|   | By:                                          | /s/ Marie      Haddad     |   |
|   |                                         | Title:      Associate Director |   |
|   |                                         |                           |   |

|   | By:    | /s/ Irja      R. Otsa          |   |
|--------|--------|-------------------------------------|--------|
|   |   | Title: Associate      Director |   |

|        | UBS      Loan Finance, LLC, as a    Lender |                           |
|--------|--------------------------------------------|--------------------------------|
|   |                                       |                           |   |
|   | By:                                        | /s/ Marie      Haddad     |   |
|   |                                       | Title:      Associate Director |   |
|   |                                       |                           |   |

|   | By:    | /s/ Irja      R. Otsa          |   |
|--------|--------|-------------------------------------|--------|
|   |   | Title: Associate      Director |   |

|        | Union      Bank, N.A. |                                 |
|--------|-----------------------|--------------------------------------|
|   |                  |                                 |   |
|   | By:                   | /s/ Charles      Thor           |   |
|   |                  | Title:      Assistant Vice President |   |
|   |                  |                                 |   |

|        | U.S.      Bank National Association, as      Lender |                                          |
|--------|-----------------------------------------------------|-----------------------------------------------|
|   |                                                |                                          |   |
|   | By:                                                 | /s/ C.S.      - signature indecipherable |   |
|   |                                                | Title:      Vice President                    |   |
|   |                                                |                                          |   |

|        | Westpac      Banking Corporation, as      Lender |                                                                 |
|--------|--------------------------------------------------|----------------------------------------------------------------------|
|   |                                             |                                                                 |   |
|   | By:                                              | /s/ Henrik      Jensen                                          |   |
|   |                                             | Title:      Director, Corporate & Institutional Banking Americas |   |
|   |

----

|        | Guarantors:                                |                          |
|--------|--------------------------------------------|-------------------------------|
|   | Aman Environmental      Construction, Inc. |                          |
|   |                                       |                          |   |
|   | By:                                        | /s/ H.      Thomas Hicks |   |
|   |                                       | Title:      Director          |   |
|   |                                       |                          |   |

|        | Washington      Holdings, Inc. |                          |
|--------|--------------------------------|-------------------------------|
|   |                           |                          |   |
|   | By:                            | /s/ H.      Thomas Hicks |   |
|   |                           | Title:      Director          |   |
|   |                           |                          |   |

|        | Cleveland      Wrecking Company |                         |
|--------|---------------------------------|------------------------------|
|   |                            |                         |   |
|   | By:                             | /s/ Rita      Armstrong |   |
|   |                            | Title:      Director         |   |
|   |                            |                         |   |

|        | EG&G      Defense Materials, Inc. |                          |
|--------|---------------------------------------|-------------------------------|
|   |                                  |                          |   |
|   | By:                                   | /s/ William      F. Neeb |   |
|   |                                  | Title:      Director          |   |
|   |                                  |                          |   |

|        | EG&G      Technical Services, Inc. |                          |
|--------|----------------------------------------|-------------------------------|
|   |                                   |                          |   |
|   | By:                                    | /s/ H.      Thomas Hicks |   |
|   |                                   | Title:      Director          |   |
|   |                                   |                          |   |

|        | E.C.      Driver & Associates, Inc. |                          |
|--------|-----------------------------------------|-------------------------------|
|   |                                    |                          |   |
|   | By:                                     | /s/ H.      Thomas Hicks |   |
|   |                                    | Title:      Director          |   |
|   |                                    |                          |   |

----

|   | Lear      Siegler Logistics International, Inc. |                          |
|--------|-------------------------------------------------|-------------------------------|
|   |                                            |                          |   |
|   | By:                                             | /s/ H.      Thomas Hicks |   |
|   |                                            | Title:      Director          |   |
|   |                                            |                          |   |

|        | Lear      Siegler Services, Inc. |                          |
|--------|----------------------------------|-------------------------------|
|   |                             |                          |   |
|   | By:                              | /s/ H.      Thomas Hicks |   |
|   |                             | Title:      Director          |   |
|   |                             |                          |   |

|        | Washington      California, Inc. |                           |
|--------|----------------------------------|--------------------------------|
|   |                             |                           |   |
|   | By:                              | /s/ Randolph      J. Hill |   |
|   |                             | Title:      Director           |   |
|   |                             |                           |   |

|        | Rust      Constuctors Puerto Rico, Inc. |                           |
|--------|-----------------------------------------|--------------------------------|
|   |                                    |                           |   |
|   | By:                                     | /s/ Randolph      J. Hill |   |
|   |                                    | Title:      Director           |   |
|   |                                    |                           |   |

|        | Rust      Constructors, Inc. |                           |
|--------|------------------------------|--------------------------------|
|   |                         |                           |   |
|   | By:                          | /s/ Randolph      J. Hill |   |
|   |                         | Title:      Director           |   |
|   |                         |                           |   |

|        | Signet      Testing Laboratories, Inc. |                         |
|--------|----------------------------------------|------------------------------|
|   |                                   |                         |   |
|   | By:                                    | /s/ Rita      Armstrong |   |
|   |                                   | Title:      Director         |   |
|   |                                   |                         |   |

----

|   | URS      Caribe, L.L.P. |                                  |
|--------|-------------------------|---------------------------------------|
|   |                    |                                  |   |
|   | By:                     | /s/ Francis      J. Geran        |   |
|   |                    | Title:      Representative of Partner |   |
|   |                    |                                  |   |

|        | URS      Construction Services, Inc. |                          |
|--------|--------------------------------------|-------------------------------|
|   |                                 |                          |   |
|   | By:                                  | /s/ H.      Thomas Hicks |   |
|   |                                 | Title:      Director          |   |
|   |                                 |                          |   |

|        | URS      Corporation |                                                   |
|--------|----------------------|--------------------------------------------------------|
|   |                 |                                                   |   |
|   | By:                  | /s/ H.      Thomas Hicks                          |   |
|   |                 | Title:      Vice President and Chief Financial Officer |   |
|   |                 |                                                   |   |

|        | URS      Corporation AES |                               |
|--------|--------------------------|------------------------------------|
|   |                     |                               |   |
|   | By:                      | /s/ William      A. Stevenson |   |
|   |                     | Title:      Director               |   |
|   |                     |                               |   |

|        | URS      Corporation - New York |                           |
|--------|---------------------------------|--------------------------------|
|   |                            |                           |   |
|   | By:                             | /s/ Francis      J. Geran |   |
|   |                            | Title:      Director           |   |
|   |                            |                           |   |

|        | URS      Corporation - North Carolina |                          |
|--------|---------------------------------------|-------------------------------|
|   |                                  |                          |   |
|   | By:                                   | /s/ H.      Thomas Hicks |   |
|   |                                  | Title:      Director          |   |
|   |                                  |                          |   |

----

|   | URS      Corporation- Ohio |                          |
|--------|----------------------------|-------------------------------|
|   |                       |                          |   |
|   | By:                        | /s/ H.      Thomas Hicks |   |
|   |                       | Title:      Director          |   |
|   |                       |                          |   |

|        | URS      Corporation GreatLakes |                          |
|--------|---------------------------------|-------------------------------|
|   |                            |                          |   |
|   | By:                             | /s/ H.      Thomas Hicks |   |
|   |                            | Title:      Director          |   |
|   |                            |                          |   |

|        | URS      Corporation Southern |                          |
|--------|-------------------------------|-------------------------------|
|   |                          |                          |   |
|   | By:                           | /s/ H.      Thomas Hicks |   |
|   |                          | Title:      Director          |   |
|   |                          |                          |   |

|        | URS      District Services,P.C. |                             |
|--------|---------------------------------|----------------------------------|
|   |                            |                             |   |
|   | By:                             | /s/ James      R. Linthicum |   |
|   |                            | Title:      Director             |   |
|   |                            |                             |   |

|        | URS      Greiner Woodward-Clyde Consultants,      Inc. |                           |
|--------|--------------------------------------------------------|--------------------------------|
|   |                                                   |                           |   |
|   | By:                                                    | /s/ Thomas      W. Bishop |   |
|   |                                                   | Title:      Director           |   |
|   |                                                   |                           |   |

|        | URS      Group, Inc. |                          |
|--------|----------------------|-------------------------------|
|   |                 |                          |   |
|   | By:                  | /s/ H.      Thomas Hicks |   |
|   |                 | Title:      Director          |   |
|   |                 |                          |   |

----

|   | URS      Holdings, Inc. |                          |
|--------|-------------------------|-------------------------------|
|   |                    |                          |   |
|   | By:                     | /s/ H.      Thomas Hicks |   |
|   |                    | Title:      Director          |   |
|   |                    |                          |   |

|        | URS      International,    Inc. |                                                   |
|--------|---------------------------------|--------------------------------------------------------|
|   |                            |                                                   |   |
|   | By:                             | /s/ H.      Thomas Hicks                          |   |
|   |                            | Title:      Vice President and Chief Financial Officer |   |
|   |                            |                                                   |   |

|        | URS      Operating Services,      Inc. |                        |
|--------|----------------------------------------|-----------------------------|
|   |                                   |                        |   |
|   | By:                                    | /s/ Charles      Baker |   |
|   |                                   | Title:      Vice President  |   |
|   |                                   |                        |   |

|        | URS      Resources, LLC |                                                                                |
|--------|-------------------------|-------------------------------------------------------------------------------------|
|   |                    |                                                                                |   |
|   | By:                     | /s/ H.      Thomas Hicks                                                       |   |
|   |                    | Title:      Chief Financial Officer, Member Representative, and Vice      President |   |
|   |                    |                                                                                |   |

|        | Washington      Demilitarization Company,      LLC |                          |
|--------|----------------------------------------------------|-------------------------------|
|   |                                               |                          |   |
|   | By:                                                | /s/ Randoph      J. Hill |   |
|   |                                               | Title:      Director          |   |
|   |                                               |                          |   |

|        | Washington      Government Environmental Services Company      LLC |                                               |
|--------|--------------------------------------------------------------------|----------------------------------------------------|
|   |                                                               |                                               |   |
|   | By:                                                                | /s/ Randoph      J. Hill                      |   |
|   |                                                               | Title:      Vice President and Assistant Secretary |   |
|   |                                                               |                                               |   |

----

|        | Washington      Group Holdings      Limited |                          |
|--------|---------------------------------------------|-------------------------------|
|   |                                        |                          |   |
|   | By:                                         | /s/ Randoph      J. Hill |   |
|   |                                        | Title:      Director          |   |
|   |                                        |                          |   |

|        | Washington      Group International,      Inc. |                          |
|--------|------------------------------------------------|-------------------------------|
|   |                                           |                          |   |
|   | By:                                            | /s/ Randoph      J. Hill |   |
|   |                                           | Title:      Director          |   |
|   |                                           |                          |   |

|        | Washington      Group Latin America, Inc. |                          |
|--------|-------------------------------------------|-------------------------------|
|   |                                      |                          |   |
|   | By:                                       | /s/ Randoph      J. Hill |   |
|   |                                      | Title:      Director          |   |
|   |                                      |                          |   |

|        | Washington      International,    Inc |                          |
|--------|---------------------------------------|-------------------------------|
|   |                                  |                          |   |
|   | By:                                   | /s/ Randoph      J. Hill |   |
|   |                                  | Title:      Director          |   |
|   |                                  |                          |   |

|        | Washington      Midwest LLC |                            |
|--------|-----------------------------|---------------------------------|
|   |                        |                            |   |
|   | By:                         | /s/ Randoph      J. Hill   |   |
|   |                        | Title:      Assistant Secretary |   |
|   |                        |                            |   |

|        | WGI      Middle East Inc. |                          |
|--------|---------------------------|-------------------------------|
|   |                      |                          |   |
|   | By:                       | /s/ Randoph      J. Hill |   |
|   |                      | Title:      Director          |   |
|   |                      |                          |   |

----

|        | Badger      Energy,    Inc. |                          |
|--------|-----------------------------|-------------------------------|
|   |                        |                          |   |
|   | By:                         | /s/ Randoph      J. Hill |   |
|   |                        | Title:      Director          |   |
|   |                        |                          |   |

|        | Badger      Middle East,      Inc. |                          |
|--------|------------------------------------|-------------------------------|
|   |                               |                          |   |
|   | By:                                | /s/ Randoph      J. Hill |   |
|   |                               | Title:      Director          |   |
|   |                               |                          |   |

|        | Banshee      Construction Company,      Inc. |                         |
|--------|----------------------------------------------|------------------------------|
|   |                                         |                         |   |
|   | By:                                          | /s/ Rita      Armstrong |   |
|   |                                         | Title:      Director         |   |
|   |                                         |                         |   |

|   | Clay      Street Properties |                          |
|--------|-----------------------------|-------------------------------|
|   |                        |                          |   |
|   | By:                         | /s/ H.      Thomas Hicks |   |
|   |                        | Title:      Director          |   |
|   |                        |                          |   |

|        | D&M      Consulting Engineers,      Inc. |                          |
|--------|----------------------------------------------|-------------------------------|
|   |                                         |                          |   |
|   | By:                                          | /s/ H.      Thomas Hicks |   |
|   |                                         | Title:      Director          |   |
|   |                                         |                          |   |

|        | Dames      & Moore Group (NY),      Inc. |                          |
|--------|----------------------------------------------|-------------------------------|
|   |                                         |                          |   |
|   | By:                                          | /s/ H.      Thomas Hicks |   |
|   |                                         | Title:      Director          |   |
|   |                                         |                          |   |

----

|   | Ebasco      International      Corporation |                                                   |
|--------|--------------------------------------------|--------------------------------------------------------|
|   |                                       |                                                   |   |
|   | By:                                        | /s/ H.      Thomas Hicks                          |   |
|   |                                       | Title:      Vice President and Chief Financial Officer |   |
|   |                                       |                                                   |   |

|        | Energy      Overseas International,      Inc. |                                                   |
|--------|-----------------------------------------------|--------------------------------------------------------|
|   |                                          |                                                   |   |
|   | By:                                           | /s/ H.      Thomas Hicks                          |   |
|   |                                          | Title:      Vice President and Chief Financial Officer |   |
|   |                                          |                                                   |   |

|        | Geotesting      Services,      Inc. |                          |
|--------|-------------------------------------|-------------------------------|
|   |                                |                          |   |
|   | By:                                 | /s/ H.      Thomas Hicks |   |
|   |                                | Title:      Director          |   |
|   |                                |                          |   |

|   | Harbert-Yeargin      Inc. |                                                   |
|--------|---------------------------|--------------------------------------------------------|
|   |                      |                                                   |   |
|   | By:                       | /s/ H.      Thomas Hicks                          |   |
|   |                      | Title:      Vice President and Chief Financial Officer |   |
|   |                      |                                                   |   |

|        | National      Projects,    Inc. |                                                   |
|--------|---------------------------------|--------------------------------------------------------|
|   |                            |                                                   |   |
|   | By:                             | /s/ H.      Thomas Hicks                          |   |
|   |                            | Title:      Vice President and Chief Financial Officer |   |
|   |                            |                                                   |   |

|        | Radian      Engineering,      Inc. |                          |
|--------|------------------------------------|-------------------------------|
|   |                               |                          |   |
|   | By:                                | /s/ H.      Thomas Hicks |   |
|   |                               | Title:      Director          |   |
|   |                               |                          |   |

----

|   | Raytheon-Ebasco      Overseas,    Ltd. |                                                   |
|--------|----------------------------------------|--------------------------------------------------------|
|   |                                   |                                                   |   |
|   | By:                                    | /s/ H.      Thomas Hicks                          |   |
|   |                                   | Title:      Vice President and Chief Financial Officer |   |
|   |                                   |                                                   |   |

|        | The      Leasing      Corporation |                           |
|--------|-----------------------------------|--------------------------------|
|   |                              |                           |   |
|   | By:                               | /s/ Randolph      J. Hill |   |
|   |                              | Title:      Director           |   |
|   |                              |                           |   |

|        | United      Engineers Far East,      Ltd. |                                                   |
|--------|-------------------------------------------|--------------------------------------------------------|
|   |                                      |                                                   |   |
|   | By:                                       | /s/ H.      Thomas Hicks                          |   |
|   |                                      | Title:      Vice President and Chief Financial Officer |   |
|   |                                      |                                                   |   |

|   | United      Engineers International,      Inc. |                                                   |
|--------|------------------------------------------------|--------------------------------------------------------|
|   |                                           |                                                   |   |
|   | By:                                            | /s/ H.      Thomas Hicks                          |   |
|   |                                           | Title:      Vice President and Chief Financial Officer |   |
|   |                                           |                                                   |   |

|        | United      Mid-East,      Inc. |                                                   |
|--------|---------------------------------|--------------------------------------------------------|
|   |                            |                                                   |   |
|   | By:                             | /s/ H.      Thomas Hicks                          |   |
|   |                            | Title:      Vice President and Chief Financial Officer |   |
|   |                            |                                                   |   |

|        | URS      Architects/Engineers,      Inc. |                           |
|--------|------------------------------------------|--------------------------------|
|   |                                     |                           |   |
|   | By:                                      | /s/ Francis      J. Geran |   |
|   |                                     | Title:      Director           |   |
|   |                                     |                           |   |

----

|   | URS      Architecture - Oregon,      Inc. |                                                   |
|--------|-------------------------------------------|--------------------------------------------------------|
|   |                                      |                                                   |   |
|   | By:                                       | /s/ H.      Thomas Hicks                          |   |
|   |                                      | Title:      Chief Financial Officer and Vice President |   |
|   |                                      |                                                   |   |

|        | URS      Corporation Architecture,      P.C. |                                                   |
|--------|----------------------------------------------|--------------------------------------------------------|
|   |                                         |                                                   |   |
|   | By:                                          | /s/ H.      Thomas Hicks                          |   |
|   |                                         | Title:      Chief Financial Officer and Vice President |   |
|   |                                         |                                                   |   |

|        | URS      Corporation      Design |                                                   |
|--------|----------------------------------|--------------------------------------------------------|
|   |                             |                                                   |   |
|   | By:                              | /s/ H.      Thomas Hicks                          |   |
|   |                             | Title:      Chief Financial Officer and Vice President |   |
|   |                             |                                                   |   |

|   | URS      Corporation -      Maryland |                          |
|--------|--------------------------------------|-------------------------------|
|   |                                 |                          |   |
|   | By:                                  | /s/ H.      Thomas Hicks |   |
|   |                                 | Title:      Director          |   |
|   |                                 |                          |   |

|        | URS      Corporation      Services |                          |
|--------|------------------------------------|-------------------------------|
|   |                               |                          |   |
|   | By:                                | /s/ H.      Thomas Hicks |   |
|   |                               | Title:      Director          |   |
|   |                               |                          |   |

|        | URS      Corporation      Southeast |                               |
|--------|-------------------------------------|------------------------------------|
|   |                                |                               |   |
|   | By:                                 | /s/ William      A. Stevenson |   |
|   |                                | Title:      Director               |   |
|   |                                |                               |   |

----

|   | URS-Stevenson      Architecture,      P.C. |                               |
|--------|--------------------------------------------|------------------------------------|
|   |                                       |                               |   |
|   | By:                                        | /s/ William      A. Stevenson |   |
|   |                                       | Title:      Director               |   |
|   |                                       |                               |   |

|        | Washington      Architects,      LLC |                            |
|--------|--------------------------------------|---------------------------------|
|   |                                 |                            |   |
|   | By:                                  | /s/ Randolph      J. Hill  |   |
|   |                                 | Title:      Assistant Secretary |   |
|   |                                 |                            |   |

|        | Washington-Catalytic,      Inc. |                                                   |
|--------|---------------------------------|--------------------------------------------------------|
|   |                            |                                                   |   |
|   | By:                             | /s/ H.      Thomas Hicks                          |   |
|   |                            | Title:      Vice President and Chief Financial Officer |   |
|   |                            |                                                   |   |

|   | Washington      Construction      Corporation |                                                   |
|--------|-----------------------------------------------|--------------------------------------------------------|
|   |                                          |                                                   |   |
|   | By:                                           | /s/ H.      Thomas Hicks                          |   |
|   |                                          | Title:      Vice President and Chief Financial Officer |   |
|   |                                          |                                                   |   |

|        | Targhee      International LLC |                           |
|--------|--------------------------------|--------------------------------|
|   |                           |                           |   |
|   | By:                            | /s/ Randolph      J. Hill |   |
|   |                           | Title:      Director           |   |
|   |                           |                           |   |

|        | Washington      Global Services,      Inc. |                                                   |
|--------|--------------------------------------------|--------------------------------------------------------|
|   |                                       |                                                   |   |
|   | By:                                        | /s/ H.      Thomas Hicks                          |   |
|   |                                       | Title:      Vice President and Chief Financial Officer |   |
|   |                                       |                                                   |   |

----

|   | Washington      Group Transit Management      Company |                                                   |
|--------|-------------------------------------------------------|--------------------------------------------------------|
|   |                                                  |                                                   |   |
|   | By:                                                   | /s/ H.      Thomas Hicks                          |   |
|   |                                                  | Title:      Vice President and Chief Financial Officer |   |
|   |                                                  |                                                   |   |

|        | Washington      Infrastructure      Corporation |                                                   |
|--------|-------------------------------------------------|--------------------------------------------------------|
|   |                                            |                                                   |   |
|   | By:                                             | /s/ H.      Thomas Hicks                          |   |
|   |                                            | Title:      Vice President and Chief Financial Officer |   |
|   |                                            |                                                   |   |

|        | Washington Infrastructure      Services,      Inc. |                                                   |
|--------|----------------------------------------------------|--------------------------------------------------------|
|   |                                               |                                                   |   |
|   | By:                                                | /s/ H.      Thomas Hicks                          |   |
|   |                                               | Title:      Vice President and Chief Financial Officer |   |
|   |                                               |                                                   |   |

|   | Washington      Ohio Services      LLC |                                                   |
|--------|----------------------------------------|--------------------------------------------------------|
|   |                                   |                                                   |   |
|   | By:                                    | /s/ H.      Thomas Hicks                          |   |
|   |                                   | Title:      Vice President and Chief Financial Officer |   |
|   |                                   |                                                   |   |

|        | Washington      Quality Inspection      Company |                                                   |
|--------|-------------------------------------------------|--------------------------------------------------------|
|   |                                            |                                                   |   |
|   | By:                                             | /s/ H.      Thomas Hicks                          |   |
|   |                                            | Title:      Vice President and Chief Financial Officer |   |
|   |                                            |                                                   |   |

|        | West      Valley Nuclear Services Company      LLC |                                                               |
|--------|----------------------------------------------------|--------------------------------------------------------------------|
|   |                                               |                                                               |   |
|   | By:                                                | /s/ Randolph      J. Hill                                     |   |
|   |                                               | Title:      Senior Vice President of Legal and Assistant Secretary |   |
|   |                                               |                                                               |   |

----

|   | WGCI,      Inc. |                                                   |
|--------|-----------------|--------------------------------------------------------|
|   |            |                                                   |   |
|   | By:             | /s/ H.      Thomas Hicks                          |   |
|   |            | Title:      Vice President and Chief Financial Officer |   |
|   |            |                                                   |   |

|        | WGI      Asia,      Inc. |                                                   |
|--------|--------------------------|--------------------------------------------------------|
|   |                     |                                                   |   |
|   | By:                      | /s/ H.      Thomas Hicks                          |   |
|   |                     | Title:      Vice President and Chief Financial Officer |   |
|   |                     |                                                   |   |

|        | WGI      Global      Inc. |                                                   |
|--------|---------------------------|--------------------------------------------------------|
|   |                      |                                                   |   |
|   | By:                       | /s/ H.      Thomas Hicks                          |   |
|   |                      | Title:      Vice President and Chief Financial Officer |   |
|   |                      |                                                   |   |

|   | WGI      Global Opportunities      LLC |                                                   |
|--------|----------------------------------------|--------------------------------------------------------|
|   |                                   |                                                   |   |
|   | By:                                    | /s/ H.      Thomas Hicks                          |   |
|   |                                   | Title:      Vice President and Chief Financial Officer |   |
|   |                                   |                                                   |   |

|        | WGI      Industrial Services,      Ltd. |                                     |
|--------|-----------------------------------------|------------------------------------------|
|   |                                    |                                     |   |
|   | By:                                     | /s/ Frank      S. Finlayson         |   |
|   |                                    | Title:      Vice President and Treasurer |   |
|   |                                    |                                     |   |

|        | WGI      Overseas Operations      LLC |                                                   |
|--------|---------------------------------------|--------------------------------------------------------|
|   |                                  |                                                   |   |
|   | By:                                   | /s/ H.      Thomas Hicks                          |   |
|   |                                  | Title:      Vice President and Chief Financial Officer |   |
|   |                                  |                                                   |   |

----

|   | Wisconsin      Power Constructors,      LLC |                                                   |
|--------|---------------------------------------------|--------------------------------------------------------|
|   |                                        |                                                   |   |
|   | By:                                         | /s/ H.      Thomas Hicks                          |   |
|   |                                        | Title: President      and Chief Financial Officer |   |
|   |                                        |                                                   |   |

|        | LopezGarcia      Group,      Inc. |                          |
|--------|-----------------------------------|-------------------------------|
|   |                              |                          |   |
|   | By:                               | /s/ H.      Thomas Hicks |   |
|   |                              | Title:      Director          |   |
|   |                              |                          |   |

|        | URS      Alaska,      LLC |                          |
|--------|---------------------------|-------------------------------|
|   |                      |                          |   |
|   | By:                       | /s/ H.      Thomas Hicks |   |
|   |                      | Title:      Director          |   |
|   |                      |                          |   |

----