Schlossmatt Development, Kilchberg Construction project on a site with extensive Japanese knotweed (neophyte) coverage

The project

Place: Kilchberg (ZH)
Customer: Intershop
Phases: Planning, proposal, execution and commissioning (success monitoring)
Period: 2014-2016
Construction costs: -


As part of a construction project, the extensive neophyte coverage was removed and the contaminated soil was disposed of. The roots and rhizomes of the Japanese knotweed had to be excavated to a depth of approximately 3-4 m as part of the complete remediation of the site. Additional excavation work, follow-up monitoring and other control measures ensured that no neophytes could spread from adjoining properties.


Our services

  • Survey of neophyte presence at the project site
  • Development of a process and decontamination plan for neophyte clearance and excavation of biologically contaminated material.
  • Contracting out the clearance and disposal of the existing knotweed
  • Neophyte site management
  • Site management of soil and earth connected with biological contamination by neophytes, including final documentation as part of “private monitoring”
  • Follow-up monitoring at the project site and in the border area with regard to the recurrence of knotweed coverage


  • Very extensive coverage with Japanese knotweed
  • Handling existing knotweed on adjoining properties (park with biotope)
  • Knotweed cover in the root zone of protected trees (excavation using tree protection measures)
  • Coordination of the “total remediation” objective with the construction project

Project manager:

Melanie Vögtli Co-divisional manager: Contaminated sites
MSc Environmental Engineering, ETH (Federal Institute of Technology) +41 44 839 47 71 More

Daniel Sabathy Divisional manager: Environmental Planning
Diploma in Biological Sciences ETH (Federal Institute of Technology) +41 44 839 47 76 More