Securing and remediating contaminated sites form significant priorities in PORR Umwelttechnik’s activities. Complex contamination at old sites require intense preparation regarding the assessment of risks, variant studies, rehabilitation planning or the planning of an economically and ecologically feasible measure to treat the contaminated protective goods or, often, a combination of various securing and rehabilitation methods. In this context, we not only offer pre-treatment, removal and disposal but also encapsulation using cut-off walls, immobilisation, waste treatment, ground water treatment, soil vapour extraction as well as in-situ and ex-situ micro-biological treatment.