The area of the Fischer landfill site east of Theresienfeld – once used as a gravel pit – was filled with domestic, industrial and commercial waste, oil-contaminated materials and building rubble throughout the 1970s and 1980s. Contrary to the original allocations, non-permitted waste materials were deposited far beyond the borders of the original landfill site – even underneath the upper level of ground water.

In the period of 2001 – 2008, the remediation of the Fischer landfill site was executed by the Republic of Austria, represented by the district authorities of Wiener Neustadt. To that, the complete waste body had to be cleared. The dug out waste materials (mainly domestic waste and contaminated soil, as well as barrels filled with solvent liquids) had to be transported to external treatment plants to be disposed of according to the laws.