Formerly, the “Lengauer cleaning shop“ was a dry-cleaning company, located at the western end of the market square of Schwertberg. During the period 1969–1992, perchlorethylene was used as a detergent at the site. The main issue of this rehabilitation project is the contamination of subsoil and groundwater in the surroundings of a dry-cleaner, which have been polluted by the leakage of detergents. Extensive contamination plumes have already been detected in the groundwater runoff of the dry-cleaner, where several domestic wells as well as the industrial wells of a machine factory are situated.