For the renovation and expansion of the Wetzikon hospital, various small buildings were dismantled and the partially contaminated soil was removed over a large area to clear the construction site. The project thus involved large-scale earth movements and, in addition, a soil displacement procedure was prescribed due to an entry in the test perimeter for soil displacement (PBV). The area affected by the excavation pit is around 6,000 m2. A large installation and handling area was built adjacent to it. As the soil in this area was also partially chemically contaminated and mixed with foreign substances, the topsoil and subsoil were also removed from this area of around 2,500 m2. Ecosens carried out investigations and sampling of the existing soil prior to the start of construction and assessed the soil for its usability. The findings were documented in a soil protection concept together with measures for physical soil protection. As part of the soil displacement process, a soil expert accompanied the construction work. Some of the removed soil could be temporarily stored on site for later landscaping. However, another part of the removed soil had to be disposed of due to the contamination identified.
Procurement and evaluation of soil data, development of a concept for soil analysis
Carrying out manual and excavator soundings, taking soil samples, chemical analyses to check suspected contamination (PBV), assessing the usability of the soil
Development of a soil protection concept with documentation of the investigation results and construction-related measures for physical soil protection and for the creation and maintenance of soil depots
Monitoring and documentation of the soil displacement process and the disposal work in the function of a specialist site manager, coordination with the responsible authorities
Challenges
Large amounts of topsoil and subsoil to be removed, small open areas for soil deposits
Previous uses relevant to pollution led to contamination of the soil by pollutants and by mixing with foreign substances, resulting in low usability
Soil removal was partly carried out in parallel or at the same time as demolition work
Our solutions
By carrying out clarifications at an early stage, the usability of the soil can be checked and appropriate recycling or disposal solutions can be sought.
Partial recycling of the removed soil for later landscaping can make sustainable use of soil as a resource and save disposal costs.
Careful and professional handling of the usable, excavated soil preserves soil quality and soil fertility.
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