|   | Re: | Third Amended and Restated Credit Agreement dated as of September 8, 2008 |
|--------|-----|---------------------------------------------------------------------------|

----

| Sincerely,                                     |
|------------------------------------------------|
|                                           |
| BANK OF AMERICA, N.A., as Agent                |
|   By:   /s/Roberto Salazar |
| Name:  Roberto Salazar               |
| Title:  Assistant Vice President     |

----

|                            |   | BORROWER:                                                                  |
|---------------------------------|--------|---------------------------------------------------------------------------------|
| WITNESS:                        |   | TUTOR PERINI CORPORATION, f/k/a Perini Corporation, a Massachusetts corporation |
|                            |   |                                                                            |
|   /s/John D. Barrett  |   | By:  /s/William B. Sparks                                                  |
| John D. Barrett                 |   | Name:  William B. Sparks                                              |
| Print Name                      |   | Title:  EVP, Treasurer, Corp Secretary and Clerk                      |
|                            |   |                                                                            |

|                            |   | GUARANTORS:                                      |
|---------------------------------|--------|-------------------------------------------------------|
| WITNESS:                        |   | PERINI BUILDING COMPANY, INC., an Arizona corporation |
|                            |   |                                                  |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                  |
| John D. Barrett                 |   | Name:  William B. Sparks                    |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk      |
|                            |   |                                                  |

| WITNESS:                        |   | PERINI ENVIRONMENTAL SERVICES, INC., a Delaware corporation |
|---------------------------------|--------|-------------------------------------------------------------|
|                            |   |                                                        |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                        |
| John D. Barrett                 |   | Name:  William B. Sparks                          |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk            |
|                            |   |                                                        |

----

| WITNESS:                        |   | INTERNATIONAL CONSTRUCTION MANAGEMENT SERVICES, INC., a Delaware corporation |
|---------------------------------|--------|------------------------------------------------------------------------------|
|                            |   |                                                                         |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                         |
| John D. Barrett                 |   | Name:  William B. Sparks                                           |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk                             |
|                            |   |                                                                         |

| WITNESS:                        |   | PERINI MANAGEMENT SERVICES, INC., a Massachusetts corporation |
|---------------------------------|--------|---------------------------------------------------------------|
|                            |   |                                                          |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                          |
| John D. Barrett                 |   | Name:  William B. Sparks                            |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk              |
|                            |   |                                                          |

| WITNESS:                        |   | BOW EQUIPMENT LEASING COMPANY, INC., a New Hampshire corporation |
|---------------------------------|--------|------------------------------------------------------------------|
|                            |   |                                                             |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                             |
| John D. Barrett                 |   | Name:  William B. Sparks                               |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk                 |
|                            |   |                                                             |

| WITNESS:                        |   | R.E. DAILEY & CO., a Michigan corporation    |
|---------------------------------|--------|--------------------------------------------------|
|                            |   |                                             |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks             |
| John D. Barrett                 |   | Name:  William B. Sparks               |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk |
|                            |   |                                             |

----

| WITNESS:                        |   | PERINI LAND AND DEVELOPMENT COMPANY, INC., a Massachusetts corporation |
|---------------------------------|--------|------------------------------------------------------------------------|
|                            |   |                                                                   |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                   |
| John D. Barrett                 |   | Name:  William B. Sparks                                     |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk                       |
|                            |   |                                                                   |

| WITNESS:                        |   | PARAMOUNT DEVELOPMENT ASSOCIATES, INC., a Massachusetts corporation |
|---------------------------------|--------|---------------------------------------------------------------------|
|                            |   |                                                                |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                |
| John D. Barrett                 |   | Name:  William B. Sparks                                  |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk                    |
|                            |   |                                                                |

| WITNESS:                        |   | PERCON CONSTRUCTORS, INC., a Delaware corporation |
|---------------------------------|--------|---------------------------------------------------|
|                            |   |                                              |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks              |
| John D. Barrett                 |   | Name:  William B. Sparks                |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk  |
|                            |   |                                              |

| WITNESS:                        |   | PERLAND CONSTRUCTION, INC., a West Virginia corporation |
|---------------------------------|--------|---------------------------------------------------------|
|                            |   |                                                    |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                    |
| John D. Barrett                 |   | Name:  William B. Sparks                      |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk        |
|                            |   |                                                    |

----

| WITNESS:                        |   | JAMES A. CUMMINGS, INC., a Florida corporation   |
|---------------------------------|--------|--------------------------------------------------|
|                            |   |                                             |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks             |
| John D. Barrett                 |   | Name:  William B. Sparks               |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk |
|                            |   |                                             |

| WITNESS:                        |   | CHERRY HILL CONSTRUCTION, INC., a Maryland corporation |
|---------------------------------|--------|--------------------------------------------------------|
|                            |   |                                                   |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                   |
| John D. Barrett                 |   | Name:  William B. Sparks                     |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk       |
|                            |   |                                                   |

| WITNESS:                        |   | RUDOLPH AND SLETTEN, INC., a California corporation |
|---------------------------------|--------|-----------------------------------------------------|
|                            |   |                                                |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                |
| John D. Barrett                 |   | Name:  William B. Sparks                  |
| Print Name                      |   | Title:  Treasurer, Secretary and Clerk    |
|                            |   |                                                |

| WITNESS:                        |   | TUTOR-SALIBA, LLC, a California limited liability company |
|---------------------------------|--------|-----------------------------------------------------------|
|                            |   |                                                      |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                      |
| John D. Barrett                 |   | Name:  William B. Sparks                        |
| Print Name                      |   | Title:  SVP, CFO, Treasurer and Secretary       |
|                            |   |                                                      |

----

| WITNESS:                        |   | TUTOR-SALIBA CORPORATION, f/k/a Tutor-Saliba Builders, a California corporation |
|---------------------------------|--------|---------------------------------------------------------------------------------|
|                            |   |                                                                            |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                            |
| John D. Barrett                 |   | Name:  William B. Sparks                                              |
| Print Name                      |   | Title:  SVP, CFO, Treasurer and Secretary                             |
|                            |   |                                                                            |

| WITNESS:                        |   | POWERCO ELECTRIC CORP., a California corporation    |
|---------------------------------|--------|-----------------------------------------------------|
|                            |   |                                                |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                |
| John D. Barrett                 |   | Name:  William B. Sparks                  |
| Print Name                      |   | Title:  Vice President, CFO and Secretary |
|                            |   |                                                |

| WITNESS:                        |   | TUTOR HOLDINGS, LLC., a Delaware limited liability company |
|---------------------------------|--------|------------------------------------------------------------|
|                            |   |                                                       |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                       |
| John D. Barrett                 |   | Name:  William B. Sparks                         |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer  |
|                            |   |                                                       |

| WITNESS:                        |   | TUTOR PACIFIC CONSTRUCTION, LLC, a Delaware limited liability company |
|---------------------------------|--------|-----------------------------------------------------------------------|
|                            |   |                                                                  |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                  |
| John D. Barrett                 |   | Name:  William B. Sparks                                    |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer             |
|                            |   |                                                                  |

----

| WITNESS:                        |   | TUTOR MICRONESIA CONSTRUCTION, LLC., a Delaware limited liability company |
|---------------------------------|--------|---------------------------------------------------------------------------|
|                            |   |                                                                      |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                                      |
| John D. Barrett                 |   | Name:  William B. Sparks                                        |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer                 |
|                            |   |                                                                      |

| WITNESS:                        |   | G.W. MURPHY CONSTRUCTION COMPANY, INC., a Hawaii corporation |
|---------------------------------|--------|--------------------------------------------------------------|
|                            |   |                                                         |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                         |
| John D. Barrett                 |   | Name:  William B. Sparks                           |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer    |
|                            |   |                                                         |

| WITNESS:                        |   | E.E. BLACK, LIMITED., a Hawaii corporation                |
|---------------------------------|--------|-----------------------------------------------------------|
|                            |   |                                                      |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                      |
| John D. Barrett                 |   | Name:  William B. Sparks                        |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer |
|                            |   |                                                      |

| WITNESS:                        |   | DESERT PLUMBING & HEATING CO., INC., a Nevada corporation |
|---------------------------------|--------|---------------------------------------------------------------|
|                            |   |                                                          |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                          |
| John D. Barrett                 |   | Name:  William B. Sparks                            |
| Print Name                      |   | Title:  Vice President and Assistant Secretary      |
|                            |   |                                                          |

----

| WITNESS:                        |   | TUTOR INVESTMENTS, INC., a Nevada corporation             |
|---------------------------------|--------|-----------------------------------------------------------|
|                            |   |                                                      |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                      |
| John D. Barrett                 |   | Name:  William B. Sparks                        |
| Print Name                      |   | Title:  Vice President, Secretary and Treasurer |
|                            |   |                                                      |

| WITNESS:                        |   | TPC AGGREGATES, LLC., a Nevada limited liability company      |
|---------------------------------|--------|---------------------------------------------------------------|
|                            |   |                                                          |
|   /s/John D. Barrett  |   | By:   /s/William B. Sparks                          |
| John D. Barrett                 |   | Name:  William B. Sparks                            |
| Print Name                      |   | Title:  Vice President, CFO and Assistant Secretary |
|                            |   |                                                          |

| WITNESS:                 |   | DANIEL J. KEATING CONSTRUCTION COMPANY, LLC., a Delaware limited liability company (successor by conversion to Daniel J. Keating Construction Company, a Pennsylvania corporation) |
|--------------------------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                     |   |                                                                                                                                                                               |
| /s/John D. Barrett  |   | By:   /s/William B. Sparks                                                                                                                                               |
| John D. Barrett          |   | Name:  William B. Sparks                                                                                                                                                 |
| Print Name               |   | Title:  Treasurer and Corporate Secretary and Clerk                                                                                                                      |
|                     |   |                                                                                                                                                                               |

----

|   |   | LENDERS:                                                                        |
|--------|--------|---------------------------------------------------------------------------------|
|   |   |                                                                            |
|   |   | BANK OF AMERICA, N.A., as a Supplemental Revolver Lender and a Revolving Lender |
|   |   |                                                                            |
|   |   | By:  /s/Chris Busconi                                                      |
|   |   | Name:  Chris Busconi                                                  |
|   |   | Title:  Vice President                                                |
|   |   |                                                                            |

----

|   |   |                                                       |
|--------|--------|------------------------------------------------------------|
|   |   |                                                       |
|   |   | BMO CAPITAL MARKETS FINANCING, INC., as a Revolving Lender |
|   |   |                                                       |
|   |   | By:  /s/John Armstrong                                |
|   |   | Name:  John Armstrong                            |
|   |   | Title:  Director                                 |
|   |   |                                                       |

----

|   |   |                                 |
|--------|--------|--------------------------------------|
|   |   |                                 |
|   |   | TD BANK, N.A., as a Revolving Lender |
|   |   |                                 |
|   |   | By:                                  |
|   |   | Name:                                |
|   |   | Title:                               |
|   |   |                                 |

----

|   |   |                                    |
|--------|--------|-----------------------------------------|
|   |   |                                    |
|   |   | SOVEREIGN BANK, as a Revolving Lender   |
|   |   |                                    |
|   |   | By:  /s/Greg Batsevitsky           |
|   |   | Name:  Greg Batsevitsky       |
|   |   | Title:  Senior Vice President |
|   |   |                                    |

----

|   |   |                                 |
|--------|--------|--------------------------------------|
|   |   |                                 |
|   |   | COMERICA BANK, as a Revolving Lender |
|   |   |                                 |
|   |   | By:                                  |
|   |   | Name:                                |
|   |   | Title:                               |
|   |   |                                 |

----

|   |   |                                    |
|--------|--------|-----------------------------------------|
|   |   |                                    |
|   |   | UNION BANK, N.A., as a Revolving Lender |
|   |   |                                    |
|   |   | By:  /s/Greg Plazula               |
|   |   | Name:  Greg Plazula                |
|   |   | Title:  Vice President             |
|   |   |                                    |

----

|   |   |                                                   |
|--------|--------|--------------------------------------------------------|
|   |   |                                                   |
|   |   | U.S. BANK, NATIONAL ASSOCIATION, as a Revolving Lender |
|   |   |                                                   |
|   |   | By:                                                    |
|   |   | Name:                                                  |
|   |   | Title:                                                 |
|   |   |                                                   |