Groundworks case studies

Soil case studies:

Removal of contaminated soil combined with archaeological prospecting

In order to construct two apartment blocks on a former garden centre site, the slightly contaminated soil had to be removed to a depth of approximately half a metre and disposed of.


Assessment of soil contamination within the test perimeters for soil displacement

Parts of a large property site on Lake Zug were included within the test perimeters for soil displacement (PBV), with a higher potential for suspected chemical soil contamination.


Pesticide surveys on former experimental fields of an agrochemical company

Extensive arable farmland was leased by an agrochemical company for many years and used as an experimental field for chlorinated and other pesticides. No accurate information could be obtained about its long-term history of use and the insecticides sprayed.


Extension of Uster Hospital: Soil surveys and monitoring of soil displacement process

Uster Hospital is being converted and extended in several phases. Some of the new buildings will be accommodated in the present parking lot and a lawn is being temporarily used for installations and temporary parking. Some of these areas have been entered in the test perimeters for soil displacement (PBV).


Contaminated sites case studies:

Legal Study Related to the Contaminated Site of a Former Electroplating Shop in Obfelden in the Canton of Zürich

As a result of the approx. 40-year operation of an electroplating shop in Obfelden, the site was entered into the Register of Contaminated Sites (KbS). In addition to chlorinated hydrocarbons (CHCs), various heavy metals (particularly chromate) and non-chlorinated cooling lubricants were also used in the electroplating shop.


Remediation of groundwater in an industrial area, removing chlorinated solvents using anaerobic dechlorination, Zurich

The subsoil under this industrial area has been damaged with highly chlorinated hydrocarbons (tetrachloroethylene). The pollutants extend into the groundwater-saturated area (8-17 m below ground). Due to the deep location of the contamination, the implementation of an in-situ remediation variant was preferred.


Remediation of a CHC site - Planning and project management

As a result of many years of operating a dry-cleaning facility, chlorinated hydrocarbons (CHCs) were found to contaminate the subsoil of a private property.


Preliminary examination of a communal landfill site - Historical and technical investigation according to the Ordinance on the Remediation of Polluted Sites

The canton requested the municipality to survey a former municipal landfill site. Ecosens carried out a corresponding preliminary investigation for the municipality in accordance with the Ordinance on the Remediation of Polluted Sites.


Construction of new ZSC Lions’ ice hockey stadium, Zurich, Clearing the site of former allotments

As the owner of the former allotments, Zurich City Council was responsible for clearing the site to allow the construction of the new ice hockey stadium.


New high-rise building, Zurich, Complete decontamination as part a tightly scheduled construction project

As part of a new-build project in the city of Zurich, the former commercial premises had to be demolished and the entire site decontaminated.


Former Ilford site, Marly, historical and technical preliminary assessment in accordance with the Contaminated Sites Ordinance (CSO)

From 1980 until 2013, Marly was home to a cutting-edge factory producing film and photographic paper. Owing to the site's industrial past, it was deemed to require further investigation and was entered in the Register of Contaminated Sites. Ecosens carried out a historical survey of the site.


Groundwater case studies:

Detailed hydrogeological examination, Stierenberg Spring, Schwarzsee (FR)

The Stierenberg spring is located in the lower part of the Euschel valley between Schwarzsee and Jaun. In connection with the current water supply projects in the neighbouring Breccaschlund, the Euschel valley and the village of Schwarzsee (...)


Protected zone mapping, Görtscheggli und Laupers Bärgli springs

The two spring captures, Laupers Bärgli and Görtscheggli, with an average total yield of 400 l/min, are located at an altitude of respectively 1,294 m and 1,170 m in the forested area south of Plasselb.


Landslide remediation works, Müllera reservoir, Plasselb

Heavy rain caused a landslide at Müllera reservoir. Due to the slippage of the surface layers, surface water was able to find its way quickly into Müllera reservoir, jeopardising the quality of drinking water.


Subsoil remediation using excavated soil (stopping contamination at source), Lupfig/Hausen (AG)

As a result of previous production processes, there was soil and groundwater contamination on the former Reichhold Chemie site in Hausen and Lupfig. To enable the site to be developed and built on in the future, cutting-edge technology was used to ensure that pollutants present in the ground could be reduced to a minimum. Under the planning and management of Ecosens AG, excavation work incorporating the site's groundwater was undertaken.


Soil Investigations:

Soil Investigation and Clarifications of Groundwater Conditions, Stierli Site, Zürich-Seebach

A new construction is to be developed on this industrial site. To this end, Ecosens AG explored the geological and hydrogeological conditions in detail by means of core drilling, dynamic probing and pumping tests. A soil model was produced with a detailed description of the geological layers.


Soil Investigation for a New Construction of a Residential/Commercial Building

For the planned new construction, an assessment of the geological and hydrogeological conditions was performed. Core drilling and percussion drilling were evaluated, as well as a pumping test.


Soil Investigation and Clarifications of Groundwater Conditions, Recycling Plant New Construction, Hinwil

The new construction of a recycling plant is planned on the site. Ecosens AG has explored the geological and hydrogeological conditions by means of core drilling, standard penetration tests (SPT) and pumping tests. A soil model was produced with a detailed description of the geological layers.


Shooting range case studies:

300 m and 400 m bullet trap shooting range Neuholz, Wald

The Neuholz in Wald (ZH) shooting range includes a 300 m bullet trap that is still in use, as well as an old 400 m bullet trap, which was used until around 1930. Both bullet traps are hundreds of metres away from the nearest street. For the contaminated site remediation of the two bullet traps, economic development and construction site logistics presented the major challenges.


Sennenberg shooting range - Project development, submission and site remediation

Wald Municipality (ZH) was obliged to remediate the bullet trap of the Sennenberg shooting range on a steep and remote slope in the agricultural zone, taking previous contamination into account.


Decontamination project and site remediation for 50 m and 300 m shooting ranges at Sohr, Windisch

The municipality of Windisch needed to remediate the 50 and 300 m bullet trap at the decommissioned Sohr shooting range in line with statutory site decontamination requirements. Due to its position in the agricultural zone, the remediation work entailed breaking up all concrete structures and recultivating high-grade agricultural land. Ecosens AG provided support to the municipality of Windisch at all stages of the project, from planning to implementation.


300 m shooting range at Oberlaupen, Wald, project development, submission and site remediation

Remediation of bullet trap, in line with statutory site decontamination requirements, at the decommissioned Oberlaupen shooting range, which is situated on a steep hillside in a forested area of agricultural land. The exposed position of the bullet trap represented a huge challenge in terms of logistics and accessing the site. The work to remediate the site included removing and disposing of almost 1,000 tons of heavily contaminated material from the bullet trap. Following the clean up, the area was recultivated in line with the surrounding habitat and trees were replanted.


Warpel 300 m shooting range, Embrach, Project to remediate a contaminated site

The backstop for Warpel’s 300 m shooting range in Embrach is situated in the Warpel valley, a fenland area of national significance.


Talmatt 300 m shooting range, Volketswil, Detailed assessment of contaminated site and remediation project

The Talmatt shooting range in Volketswil was deemed to require remediation and entered in the Register of Contaminated Sites.


Dürrenbach 25 m und 50 m shooting ranges, Volketswil, Project to remediate a contaminated site

The Dürrenbach shooting range includes a 50 m and a 25 m backstop. It borders a forest to the north and the east and is in the immediate vicinity of a stream to the west.


Rohr 300 m, 50 m and 25 m shooting ranges, Opfikon, Preliminary assessment of contaminated site and remediation project

The Rohr shooting range includes three backstops measuring 300 m, 50 m and 25 m with 46 targets in total. The results of the preliminary assessment revealed that all three backstops would require remediation to protect the groundwater, due to the proximity of the range to the water table.