The Rohr shooting range in Opfikon comprises a 300 m, a 50 m and a 25 m bullet trap with a total of 46 targets. The results of the preliminary investigation of contaminated sites showed that, due to the small distance between the targets, all of the bullet traps require remediation to protect the groundwater. As a result, a remediation project was drawn up on behalf of the city for the three bullet traps. In 2019, the construction and clearing permit was issued and the tender for the renovation was put out to public tender. The renovation was then carried out in the fall/winter of 2020 within around 2 months. The final greening work and the planting of cleared areas were carried out in spring/summer 2021.