The project "Rumichaca - Pasto - Chacagu - Aeropuerto” involves 53.46km of new roads and 115.5km of refurbishment works. The Daza tunnel runs for about 1.6km under a maximum overburden of about 300m. The Tunnel is bi-directional with a cross-section varying between 10.6m and 12.4m. Each 3.65m-wide lane has niches every 200m in which SOS equipment are installed, together with a stopping place in the middle of the tunnel. The zone in which the project develops is geologically characterized by active volcanoes (Galeras Volcano). Satellite images show the presence of the Galeras Vulcano and anular geoforms in the West part of Paso City, in the area where the Tunnel runs, called the Daza Valley, on Northeast of Poblado, where an antique volcano (currently collapsed) is located. The tunnel will be excavated by means of traditional methods.

Technical specialized services for the redaction of the final design for the construction of Daza Tunnel:

• Geological and geotechnical studies
• Detail design of the underground works
• E&M Design
• Design and follow-up of the geognostical surveys.