North of Lägern (Cantons Zürich, Aargau) is one of the six potential siting regions for a geological repository confirmed by the Federal Council. The region to the north-west of Bülach is suitable for both a high-level waste repository and a low- and intermediate-level waste repository.
The geological siting area covers an area of around 65 square kilometres. The preferred host rock is the Opalinus Clay (with its confining units).
Understanding of the spatial conditions in the area is based on 2D seismic investigations and results from a deep borehole (Weiach). The siting area is located in a region that has partly been tectonically overprinted by the folding of the Jura mountains (precursory folding zone). For this reason, the host rock has areas with largely quiet bedding as well as zones with increased tectonic dissection.
Overall, the siting area is evaluated as being suitable.
The underground installations of a deep geological repository for high-level waste in Opalinus Clay could be constructed in the area shown in orange.
Canton Zürich: Bachs, Bülach, Eglisau, Glattfelden, Hochfelden, Neerach, Niederweningen, Oberweningen, Schleinikon, Schöfflisdorf, Stadel, Weiach
Canton Aargau: Fisibach, Schneisingen, Siglistorf
Planning perimeter for surface facilities
The required surface infrastructure (e.g. the portal of the access tunnel) could also be located outside this siting region. Working together with the affected Cantons and representatives from Germany, the Federal Government has defined planning zones (so-called planning perimeters) that include these additional areas. The planning perimeter extends up to 5 km around the geological siting region and should have good road or rail access. Mountainous and hilly zones and protected natural areas are restricting factors. The Federal Office of Energy announced the planning perimeters in provisional form on 10th December 2009; these were approved by the Federal Council on 30th November 2011.
Additional communities within the planning perimeter (besides the siting communities):
Canton Zürich: Bachenbülach,Dielsdorf, Embrach, Höri, Hüntwangen, Niederglatt, Niederhasli, Oberglatt, Rafz, Rorbas, Steinmaur, Wasterkingen, Wil, Winkel
Canton Schaffhausen: Buchberg, Rüdlingen
Canton Aargau: Ehrendingen, Endingen, Freienwil, Kaiserstuhl, Lengnau, Mellikon, Rekingen, Rümikon, Unterendingen, Wislikofen
The area is located in the community of Mellikon and partly in Rekingen. The eastern section is used for agriculture, while the western section is in an industrial zone and is already developed with good access. Two factory buildings would have to be demolished to allow construction of the facility. The facility would not be clearly visible from residential areas.
The area lies in the community of Weiach close to an existing gravel-pit. A small part is used today for agriculture. Construction measures would be required to provide access to the area. It is visible particularly from the north, but this could be minimised by lowering the facility to the level of the bottom of the gravel-pit.
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|At a media conference held by the Swiss Federal Office of Energy (SFOE), Nagra announces its proposals for potential siting areas for the surface facility. These will serve as the basis for discussions within the framework of regional participation.|
|The Federal Council decides to include the siting region North of Lägern in the further Sectoral Plan process. Stage 1 of the process is completed and Stage 2 initiated.|
|Start of the public consultation phase on Stage 1
of the site selection process for deep geological repositories. |
|The Swiss Federal Nuclear Safety Inspectorate (ENSI) approves Nagra's proposed siting regions following a review of safety and engineering feasibility aspects.|
|Announcement of the provisional planning perimeter by the Swiss Federal Office of Energy (SFOE).|
|Glattfelden. Together with the ENSI and Nagra, the SFOE provides information on the proposals for geological siting regions.|
|Announcement by the SFOE of the proposed siting regions for deep geological repositories.|
|The Federal Council approves the conceptual part of the sectoral plan for deep geological repositories. |
|The Federal Council approves the „Entsorgungsnachweis" project, but rejects the request for identification of a site as being premature. |
|2005||Submission of a report setting out the options, in terms of potential host rocks and siting regions, for disposal of high-level waste (NTB 05-02, in German).|
|2002||Submission of the „Entsorgungsnachweis" feasibility study for high-level waste to the Federal Council. The project is based on the example of the Opalinus Clay in the Zürcher Weinland.|
| 1991 – 1992||Regional seismic investigations between the river Aare and Lake Constance (2D seismics).|
|1982 – 1984||Regional seismic investigations in the area Olten - Schaffhausen.|
| 1982 – 1983||Weiach (ZH) borehole.|