Milan, 8 May 2013. Impregilo, a Salini Group company, in association with Parsons Corporation, one of the main construction companies in the United States, has been awarded a contract to design and build a section of a rainfall and waste water collection and treatment system in Washington, D.C.

The project, with a high technological component, has a value of circa 254 million dollars (the overall share pertaining to the Group is 65%). Impregilo will operate as the project's leader and will coordinate the works with Parsons and its U.S. subsidiary Healy, specialized in the realization of underground projects.

The "Anacostia River Tunnel" project, part of DC Water's "Clean Rivers" project, envisages the construction of an hydraulic tunnel that will run for most part under the Anacostia River, a tributary of the Potomac. The tunnel will have a length of 3.8 kilometers, an inner diameter of 7 meters and six water collection wells each with a depth of approximately 30 meters. The tunnel will collect and convey separately waste waters and rainfall, thereby avoiding river pollution caused by combined sewer overflows ("CSO") that occur during intense rains.  The completion of the project is foreseen in approximately four years and a half after the start of the works.

Through this new award the Group consolidates its leadership in the underground constructor sector and reinforces its presence in the United States, where Impregilo is currently building a section of the San Francisco underground, a water collection and transportation system underneath Lake Mead in Las Vegas and the construction of the new "Gerald Desmond" bridge at Long Beach (California).

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