Abstract: The invention pertains to a process for sealing off ground sites in particular a waste dump, abandoned dumping grounds, pipelines or the like, or also excavated construction sites, using sealants, wherein a fully course-controlled boring technique is used to drive at least one bore underneath the ground site from the surface outside the ground site and the sealant is injected into the soil surrounding the bore. To implement the process, jets for injecting the sealant into the soil are mounted on the steerable remote-controlled boring head.

Abstract: The method of sealing a polluted area containing pollutants to prevent transport of the pollutants from the polluted area includes forming a sealing barrier layer around the polluted area underneath and/or next to it by feeding a liquid sealing material into the liquid permeable ground and fissures under and/or next to the polluted area or into the polluted area by a plurality of injection lances and/or pressure probes from above ground or from the surface of the polluted area. The liquid sealing material is a Montan wax emulsion or a mixture of the emulsion with earth and/or pollutants, the Montan wax emulsion is made from 10 to 20 parts by weight Montan wax, 3 to 5 parts by weight emulsifier, 100 parts by weight of water and from 0 to 10 by weight of a stabilizer.