When Keller was asked to provide a geotechnical solution for the construction pit of a new residential block on a contaminated site in Austria, it proposed an innovative technique that combined jet grouting, or Soilcrete, with an oxidising agent to simultaneously provide support and remediate the soil. For several decades Rittegasse in Graz was home to the ST25 Putzerei Plachy - a former clothes dyeing and later dry-cleaning and laundrette business. Apparently, over many years, the cleaning agent tetrachloroethylene seeped into the ground, leading to heavy subsoil contamination.
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