CH2M HILL, Washington Group International, BWX Technologies Team Wins $314 million Environmental Closure Contract in Ohio.

Business Editors/Environmental Writers

BOISE, Idaho--(BUSINESS WIRE)--Dec. 6, 2002

Washington Group International, Inc. (OTCBB:WGII) today announced that it has teamed with CH2M HILL and BWX Technologies to win a major environmental closure contract from the U.S. Department of Energy to complete environmental restoration at the Miamisburg Closure Project in Ohio. CH2M HILL Mound, Inc. will be the lead contractor, with Washington Group and BWX Technologies as integrated partners. The contract value is approximately $314 million, with work to begin January 1, 2003.

The new contract calls for the demolition of 66 facilities, including the removal of all above-ground utilities and structures at the former nuclear weapons material processing site. Nine buildings will be transferred to the City of Miamisburg for an industrial park. All hazardous and radioactive waste will be processed and shipped offsite. The work is to be completed by March 31, 2006.

"Our partnership provides the experience, framework and strength necessary to achieve closure at the site to reduce environmental risks and expedite the return of the site to benefit the city of Miamisburg," said Stephen G. Hanks, president and chief executive officer of Washington Group International. "We are looking forward to the opportunity to apply new environmental approaches learned at sites where we're helping DOE and others to perform similar work."

Washington Group has performed comparable closure work at the Weldon Spring Site Remediation Action Project near St. Louis and at the Bunker Hill Superfund Site in northern Idaho.

Hanks went on to say that the combined experience base of Washington Group and its partners will lead to greater accountability, regulator involvement, responsibility and performance.

The Miamisburg Closure Project is the second major DOE contract Washington Group has won in the past two months. In October, a Washington Group team received a contract extension worth $230 million to continue its cleanup of the West Valley Demonstration Project in upstate New York -- the only commercial spent-nuclear-fuel-reprocessing facility ever to operate in the United States.

About Washington Group

Washington Group International, Inc. (OTCBB:WGII) is a leading international engineering, construction and environmental firm. With more than 30,000 employees at work in over 40 states and more than 30 countries, the company offers a full life cycle of services as a preferred provider of premier science, engineering, construction, operations, maintenance, program management and development services in 14 major markets. Those markets are: energy, environmental, government, heavy civil, industrial, mining, nuclear services, operations and maintenance, petroleum and chemicals, process, pulp and paper, telecommunications, transportation, and water resources.

About CH2M HILL

CH2M HILL is an employee-owned, global firm providing engineering, construction, operations and related technical services to public and private clients in numerous industries on six continents. The firm's work is concentrated in the areas of energy, environment, water, transportation, telecommunications, construction and environmental facilities. Headquartered in Denver, CH2M HILL has more than 10,500 employees in 165 offices worldwide.

About BWX Technologies of Ohio

BWXTO is a unit of BWX Technologies, Inc., of Lynchburg, VA, a diversified manufacturer of nuclear components and advanced energy products, that manages U.S. Department of Energy sites in six states. BWXT is a wholly owned subsidiary of McDermott International, Inc. (NYSE:MDR), a leading worldwide energy services company. The company and its subsidiaries manufacture steam-generating equipment, environmental equipment, and products for the U.S. government. They also provide engineering and construction services for industrial, utility and hydrocarbon processing facilities and to the offshore oil and natural gas industry.

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