Key legal question
Whether A. AG had to bear the emergency cleanup costs as a polluter/storied party under environmental law.
Extracted holding
Yes. As owner and controller of the leaking tank, A. AG was a Zustandsstörerin and therefore liable for the costs of the immediately necessary measures.
Extracted reasoning
A status-based polluter need not have acted culpably. The tank itself was the immediate source of danger; higher force and the fact that the event was unforeseeable did not exclude cost liability. The danger assessment had to be made ex ante, and the chosen measures were reasonable in light of the information available at the time.