The data are used for monitoring purposes and as a basis for hydrogeological models. To this end, the rock mass was classified in hydrogeological zones based on the permeability of the rock, thus defining flow systems at varying depths. Austria and Italy are implementing numerous environmental projects during the construction of the Brenner Base Tunnel. The high-capacity rail line itself is contributing to the protection of the Alps. Even the construction process is as environmentally friendly as possible. Air pollution caused by construction site traffic is also minimised. This is why several additional motorway slip roads have been provided in the project area: they allow the construction site to be supplied exclusively over the primary road network, thus effectively eliminating additional traffic through local residential areas. The construction of the Brenner Base Tunnel is accompanied by comprehensive environmental measures. The public and the flora and fauna are affected as little as possible by the construction work. The construction of the Brenner Base Tunnel is subject to strict environmental regulations. Protecting the public Dust and noise at the construction sites are kept as low as possible. Noise protection baffles and walls have been erected to protect against noise pollution. The turbines used to ventilate the tunnel are housed in their own caverns built in the rock. Where construction sites are located close to populated areas, construction hours are limited to take into account the needs of the local residents. A dedicated access tunnel, the Saxener tunnel, was built for the construction site in Wolf near Steinach am Brenner. All site traffic exits the A13 Brenner motorway at the Plon road maintenance depot and travels through the Saxener tunnel directly to the construction site in Wolf. The town of Steinach is therefore not burdened with construction site traffic. A dedicated railway siding was built for the Wolf construction site in 2016. Construction materials and machinery can be directly delivered and removed by train. All site roads and temporary storage areas on the construction sites are watered down to reduce dust. Vehicles and construction machines are cleaned regularly. Material transport within the construction sites takes place largely via conveyor belts. All vehicles and construction machinery must comply with the latest technical standards. 35 BRENNER BASE TUNNEL
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