Contaminated sites.

SBB has carried out a comprehensive project to survey all its locations affected by contaminated sites. Locations constituting a danger to people and the environment are being remediated.

Some SBB sites have been polluted by decades of intensive use (mostly by third parties). Accidents or the incorrect use of chemicals and fuels have in some places also caused the subsurface to be polluted. SBB has recognised the hazards that can be caused by polluted land and has commissioned an in-house unit to record, examine and remediate these polluted sites.

Experts working on a comprehensive project have identified almost 6,500 potentially contaminated sites. Following an initial investigation, it was fortunately possible to classify the vast majority of these as not presenting a hazard to people or the environment. Around 1,600 areas remained under consideration by the experts after this initial round of inspections to more closely determine possible hazards for ground water, rivers, lakes, air and soil.

Detailed investigations in the second phase also indicate that most of the locations inspected so far do not present a hazard to people or the environment. In about 55 cases, however, the experts found contaminated sites that needed remediated. Renovation has already been completed in over 50% of cases.

Contaminated site project in Ticino.

In Biasca, SBB built a maintenance and intervention centre for the new Gotthard Base Tunnel. The subsurface beneath the centre was contaminated, primarily with chromium, and required remediation of the contaminated site. In parallel with constructing the new centre, SBB remediated this contaminated site – in other words, it was preventing the pollutants from escaping into the environment. Thanks to the inspired combination of remediating the contaminated site while simultaneously building the maintenance and intervention centre, SBB was able to remediate this site cost-effectively and ecologically.

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