Doranova finished 2013 Kopli railway depot contaminated soil remediation project. The total volume of the contaminated soil in the three contract areas was over 24 000 m3 with heavy concentrations of mineral oils and PAH-compounds. The challenge in the implementation was to design treatment method which can be applied to high traffic railway depot, without disturbance to normal operation. The remediation was done with the combination of Doranova’s mobile on site- treatment unit and mass exchange. The site is one of the biggest remediation sites completed in Estonia.