Abstract
The ''Chalk landfill Bruck I/II'', a former industrial landfill is located in Austria. The landfill was filled from 1926-1981 with calcium carbide, CHC and mercury contaminated wastes. The total amount of HCH is estimated to 100-1000 t. Since 1995 different remedial actions took place as well as continuous securing measures. In 2000 the site was put on the list of contaminated sites that need remediation and got codename K20. Additional tests in 2003 gave the site highest priority level one. In 2009 decision is made to remove all stored material and treat or safely store in state-of-the-art landfill. After observation of Hexachlorobenzene in food in the area around the thermal treatment plant works were stopped. The new course of action was to secure the waste on site. The new physical safeguard measures included an innovative, multifunctional surface sealing system consisting of calcium bentonite geosynthetic clay liner, an activated carbon mat, a LDPE membrane with integrated aluminium sheet and a drainage element. This system creates a strong barrier for volatile CHC. There are soil vapor extraction pipes below and above the sealing system to ensure a monitoring. Minimal interference with existing landfill body was requirement. To enable long term stability of the whole sealing system geogrids are used. The construction work was executed in 2016.
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