On July 15, 2013, Impregilo, in partnership with its US subsidiary Healy S.A., won the competitive bidding for a lot to build a new wastewater collection system in the capital of the country, as part of the environmental remediation program of the metropolitan region of Buenos Aires Province. The value of the project, led by AySA (Agua y Sanamientos Argentinos SA), one of the major players in the Argentine water sector, is approximately € 360 million.

The project involves the collection of wastewater from the Riachuelo treatment plant by means of a pit about 40 m deep. The wastewater will then be conveyed through a tunnel measuring 11 km long and 3.8 m in diameter to an outlet that will be built on the bed of Rio de la Plata.

The initiative has a strong social and environmental value. It is the first part of a broader program funded by the World Bank for sustainable development of the Matanza-Riachuelo Basin, aimed at cleaning up the Riachuelo River and the regions it passes through, which are considered to be among the most polluted in the world.

The works carried out during the first half of 2015 concern the general setup of the worksite with the creation of the central office for the JV, the beginning of the construction of the temporal worksite installations, where the connection well of the outlet tunnel must be built, or the installations where the prefabrication of the rings for the tunnel's covering.

We are also carrying out system detailed engineering activities, based on what has been detected and on the geological investigations that have been realised in the same period, both on land and on the off-shore tunnel.

Access to the area of the main worksite has been improved and the area has been prepared to realise the embankment where the excavation of the tunnel's well.

During these six months the study concerning the variation of the design of the Permanent Works and that improves the feasibility of the Diffuser and reduces maritime work risks has been completed. This technical proposal has been submitted to the Customer with regard to the Value Engineering part of the Contract.

The percentage of work completion as of June 30, 2015, was 2.4%.