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Problem statement: The doubling of Tenda pass road tunnel jointing SW France to&#13; Piedmont (Italy) was planned to penetrate a complicate rock structure in which several complex play an&#13; hydrogeologic role including carbonate-Karst aquifer between flysch impervious complexes. The main&#13; problem of the project is the presence of an hydraulic circulation feeding a spring of social and economic&#13; great importance discharging into a railroad tunnel below. Approach: The authors was charged by&#13; ANAS, Italian National Roads Authority, to execute a complete hydrogeologic prognosis of the situation&#13; that will be determinate by the excavation of the new tunnel and forecast as well as possible the hazard&#13; for the tapped spring. Results: Two years research have included a complete hydrogeologic and&#13; hydrochemical survey all the hypothesized structure feeding the spring, with several bore holes used as&#13; observation wells, the use of several monitoring device for the discharge and the chemical characters of&#13; spring, a lot of laboratory tests on cements and micro-cements and other materials used in waterproofing&#13; and sustain the rocks during the excavation and the concrete lining of the tunnel. Conclusion: The study&#13; ends with the evaluation of the vulnerability of the spring and the forecasting of contamination and&#13; depletion of the spring

Hydrogeological Prognosis with Regard to Realisation of the New Colle Di Tenda Road Tunnel