The concrete pit fields, which have to be rehabilitated, are situated south-east of the already cleaned up „Fischerdeponie“. They originated before 1945 in the course of gravel exploitation for the construction of concrete fundaments. Up to the seventies, the pits were filled with garbage, construction waste, excavation materials and barrels with various contents (distillation residues, mineral oil products, organic solvents etc.). The containers that were recovered and some of the contaminated excavation material were disposed of. After the installation of a sealing layer approx. 1 m thick, the remaining excavation material was put back and also covered in an upward direction with a sealing layer of approx. 1 m.