The scientific background for CDT, using randomly methylated ß-cyclodextrin (RAMEB), was established in small- and large-scale laboratory microcosm experiments. Based on these results, field experiments were designed and performed for the remediation of a site contaminated with transformer oil. In order to characterize the biodegradation processes in the contaminated soil and to evaluate the effect of the treatment, an integrated monitoring technique was used in both the laboratory and field experiments. This technique combined physical and chemical analyses with biological monitoring and ecotoxicity testing. After the technology was demonstrated on the contaminated site, an evaluation and verification of the CDT was performed. This comprised a complete material balance; the characterization of the risks; cost-efficiency assessment and SWOT (Strengths, Weaknesses, Opportunities, and Threats) analysis.