Renovation of Thalwil gasworks

Project overview

The operation of the Thalwil gasworks resulted in polluted soil and tar deposits in Lake Zurich. In a first step, the tar deposits were extracted from the lake using a suction pump protected by a cage, before being conditioned and disposed of ashore. In a second step, the polluted soil was removed via large overlapped drill holes.

Our services

Senior site management for the clean-up of tar deposits in the lake. Project planning, invitation to tender and site management for the clean-up of the polluted soil.

Expertise involved

Contaminated sites


Office of Waste, Water, Energy and Air (WWEA) of the canton of Zurich, municipality of Thalwil