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Old 06.11.2020, 21:59
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Re: Would you buy a property constructed on a Landfill site?

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a) and that may be too recently for any problems to be properly known, yet too long ago to be sure that there was strict enough monitoring of any environmental and safety rules which may then have been in place. This, especially since this text contains the three all-excusing words "weitgehend" (mostly) and "eher unwahrscheinlich" (more or less unlikely).
Sondermülldeponie Kölliken was in use from 1978 to 1985. Which was an as big disaster as the older one in Bonfol.
https://www.srf.ch/news/schweiz/prob...unter-der-erde
https://www.beobachter.ch/burger-ver...gift-unter-uns
https://www.swissinfo.ch/ger/sanieru...raums/42490056

The landfill site in question is quite big
https://geoview.bl.ch/main/wsgi/?wfs...kbs=2762910027

Here an aerial image from around 2000:
https://geoview.bl.ch/?map_x=2608543...er%20Standorte

It looks like it was a originally a clay pit used by the brickworks (Ziegelei) which was filled up

Here a slider view today vs. the map from around 1976 which shows the fullest extend of the clay pit. Each brown light indicated a height difference of 10 meters.
https://map.geo.admin.ch/?time=None&...ipe_ratio=0.49
My biggest concern would be more the stability of the site than what might be buried there.
It looks like they plan to build more and more towards the edge.
https://www.bzbasel.ch/basel/baselbi...eli-134571805#

Picture from 1937
https://api3.geo.admin.ch/luftbilder...2733.74&zoom=3

Picture from 1954
https://api3.geo.admin.ch/luftbilder...4403.39&zoom=5

Picture from 1964
https://api3.geo.admin.ch/luftbilder...3275.00&zoom=5

Picture from 1976
https://api3.geo.admin.ch/luftbilder...4578.90&zoom=6

Picture from 1982
https://api3.geo.admin.ch/luftbilder...1907.43&zoom=6

Picture from 1988
https://api3.geo.admin.ch/luftbilder...1948.73&zoom=6

Picture from 1994
https://api3.geo.admin.ch/luftbilder...3521.80&zoom=6
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