germany-böhlen: groundwater pollution treatment or rehabilitation./ large-scale ecological project "sow böhlen" - securing south-western gw outflow, regular operation pilot hfb 25 including gwra - 2022 to 2027 (optional 2028) [2.438]./ the subject of the contract to be awarded is the delivery and operation of a groundwater treatment plant (gwra), the operation of an existing horizontal filter well (hfb 25), delivery and operation of an emission analysis system (gc), sampling and analysis of gw in the period 2022 to 2027 (optional 2028) in the ecological large-scale project "sow böhlen".